DYNAGEN INC
8-K, 1997-07-03
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT


                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


         Date of Report (Date of earliest event reported): June 18, 1997


                                  DYNAGEN, INC.
          -------------------------------------------------------------
             (Exact name of registrant as specified in its charter)



            DELAWARE                                          1-11352          
            --------                                          -------         
(State or other jurisdiction of                      (Commission file number)  
 incorporation or organization)                                                


                                   04-3029787
                                   ----------
                                (I.R.S. Employer
                               Identification No.)



     99 Erie Street, Cambridge, MA                            02139
     -----------------------------                            -----
(Address of principal executive offices)                   (Zip Code)



Registrant's telephone number including area code:       (617) 491-2527



                           No change since last report
          -------------------------------------------------------------
             (Former name or address, if changed since last report)







                                      -2-


Item 2.  Acquisition or Disposition of Assets.

         On March 7, 1997, DynaGen,  Inc.  ("DynaGen"),  and DynaGen Acquisition
Corp.,  a  wholly-owned  subsidiary  of  DynaGen  (together  with  DynaGen,  the
"Buyers"), entered into an Agreement and Plan of Merger (the "Merger Agreement")
with  Superior  Pharmaceutical  Company  ("Superior")  and Eric C.  Hagerstrand,
Dennis  B.  Smith  and  Thomas  L.  Canning,   the   shareholders   of  Superior
Pharmaceutical  Company  (the  "Shareholders").  On June 18,  1997,  the  Buyers
acquired,  pursuant  to the Merger  Agreement  (the  "Acquisition"),  all of the
outstanding  stock of Superior (the "Superior  Stock") and paid the Shareholders
in exchange  therefor $6.25 million in cash, $5 million in three-year notes (the
"Notes") and  1,666,667  shares of DynaGen's  Common Stock (the  "Shares").  The
Shareholders  may also receive  certain  incentive  payments based on Superior's
performance during the three years following the closing of the Acquisition.  In
addition, DynaGen assumed the existing debt of Superior,  consisting principally
of an asset-based line of credit and trade payables.  Immediately  following the
closing of the  Acquisition,  Dynagen  contributed  $1.75 million to the working
capital  of  Superior. The purchase  price and terms  for the  Acquisition  were
determined in arms-length negotiations between the parties.

         The Notes are  payable  in  quarterly  installments  of  principal  and
interest  over  three  years at an  interest  rate of 9.5% and are  secured by a
pledge  of the  Superior  Stock.  DynaGen  is also  obligated  to  issue  to the
Shareholders up to an additional  1,666,667  shares of its Common Stock after 12
months if its Common  Stock is not  trading at an average of at least  $3.00 per
share for 10 consecutive trading days as reported by the Nasdaq SmallCap Market.
If,  immediately  following  the issuance of the  additional  1,666,667  shares,
DynaGen's  Common Stock is not trading at least $1.50 per share,  as reported by
the Nasdaq SmallCap Market, DynaGen shall pay to the Shareholders in immediately
available funds the difference  between $1.50 and the then current trading price
of its Common Stock for each of the 3,333,334 shares held by the Shareholders.

         DynaGen is obligated to register the Shares  within 11 months after the
closing of the Acquisition.

         Superior  obtained a secured  line of credit of up to $9  million  from
Huntington  National Bank to provide working capital for its general operations.
The loan is secured by a first-lien  security interest in all assets of Superior
and is guaranteed  by DynaGen as parent of Superior.  Superior may draw upon the
line of credit until April 5, 1998.

         The  following  debt and equity  financings  were  arranged to fund the
Acquisition:

         1. DynaGen obtained senior  subordinated debt financing of $3.0 million
from Sirrom Capital Corporation, a Tennessee corporation ("Sirrom"), and Odyssey
Investment  Partners,  L.P., a  Pennsylvania  limited  partnership  ("Odyssey").
Interest  on the senior  subordinated  debt  financing  is 13.5%  annually  with
interest  payable  in  monthly  installments.  There is no  amortization  of the
principal amount on the note for the first five years of the note, and principal
is paid upon  maturity at the end of five years.  The loan is made  available to






                                      -3-


DynaGen (as parent) for the  Acquisition and as working capital for Superior and
is  secured by a  first-lien  security  interest  on the  assets of  DynaGen,  a
second-lien  security  interest  on the  assets of  Superior  and a  second-lien
interest in the pledge of the Superior Stock.  DynaGen also issued to Sirrom and
Odyssey  warrants to purchase  400,000  shares of Common  Stock of DynaGen at an
exercise  price per share of $.01  exercisable  for five  years.  Under  certain
circumstances,  Sirrom and Odyssey may  exchange  these  warrants to buy DynaGen
Common Stock for warrants to purchase a 10% and 5%  interest,  respectively,  of
Superior's Common Stock at an exercise price per share of $.01 exercisable until
August 31, 2002. In addition, these warrants are subject to certain put features
under certain circumstances.

         2.  DynaGen  obtained  debt  financing  in the form of a bridge loan of
$500,000,  from Coutts & Co. AG, a Swiss corporation,  at an interest rate of 7%
per  annum  to be  used  for  the  maintenance  of net  worth  requirements  for
Superior's  credit  facility,  working capital for operations of DynaGen and the
Acquisition.  This loan is a non-recourse obligation of DynaGen. Two founders of
DynaGen  have  pledged 1 million  shares of  DynaGen's  Common Stock in order to
secure the obligations  represented by this bridge loan. In connection with this
bridge loan, the Company has issued 150,000  shares of its  unregistered  Common
Stock to Coutts & Co., AG.

         3. DynaGen  obtained equity financing in the form of the sale to twelve
accredited  investors of 41,000 shares of DynaGen's Series A Preferred Stock and
warrants to purchase  328,000  shares of Common Stock at an  aggregate  purchase
price of $4,100,000.  The Series A Preferred Stock has a stated dividend of five
dollars ($5.00) per share per annum. DynaGen is obligated to register the shares
of Common Stock  issuable upon  conversion  of the Series A Preferred  Stock and
exercise of the  warrants  within 90 days after the closing of the  Acquisition.
The exercise price of the warrants will be 120% of the average closing bid price
of  DynaGen's  Common Stock as reported by the Nasdaq  SmallCap  Market (or such
other  exchange on which the Common  Stock is then  traded) for the five trading
days  immediately  preceding  the  date on which  the  Securities  and  Exchange
Commission declares effective the registration statement to be filed registering
the shares of Common Stock  issuable  upon  conversion of the Series A Preferred
Stock and exercise of the warrants. The holders of Series A Preferred Stock have
certain rights of first refusal on future equity financings.

         4. DynaGen  obtained equity  financing in the form of the sale of 7,500
shares of  DynaGen's  Series B Preferred  Stock and 225,000  shares of DynaGen's
Common  Stock  at an  aggregate  purchase  price  of  $750,000  to  Julius  Baer
Securities Inc. as agent for certain  non-U.S.  persons.  The Series B Preferred
Stock has a stated dividend of seven dollars  ($7.00) per share per annum.  Upon
liquidation, the Series B Preferred Stock ranks junior to the Series A Preferred
Stock.  DynaGen is  obligated  to register  the 225,000  shares of Common  Stock
issued and the shares of Common Stock  issuable upon  conversion of the Series B
Preferred Stock within 150 days after the closing of the Acquisition.


         DynaGen  is  primarily  engaged in the  development  and  marketing  of
proprietary and generic therapeutic and diagnostic products for the human health
care market.  Superior is a pharmaceutical  manufacturing  firm that markets and
distributes  generic  pharmaceutical  products to independent  retail chains and
institutional  pharmacies.  DynaGen  intends  to  continue  to  use 






                                      -4-


the assets  purchased from the Seller,  including  40,000 square feet of office,
warehouse and distribution  space, for the purpose of marketing and distributing
generic pharmaceutical products.

Item 7.  Financial Statements and Exhibits.

         (a)      Financial statements of business acquired.

                  It  is  impracticable  to  provide  the  financial  statements
                  required pursuant to Regulation S-X at the time this report is
                  filed. Such required financial information will be filed under
                  cover of Form 8-K as soon as  practicable  but not later  than
                  September 1, 1997.

         (b)      Unaudited Pro Forma Combined Financial Information.

                  It  is  impracticable  to  provide  the  pro  forma  financial
                  information  required pursuant to Article 11 of Regulation S-X
                  at the time  this  report is filed.  Such  required  pro forma
                  financial information will be filed under cover of Form 8-K as
                  soon as practicable but not later than September 1, 1997.

         (c)      Exhibits.

                  2.1      Agreement  and Plan of  Merger  dated  March 7,  1997
                           among DynaGen,  DynaGen  Acquisition Corp.,  Superior
                           and  the   Shareholders   (filed  as  Exhibit  2c  to
                           DynaGen's  Transition  report  on Form  10-K  for the
                           transition  period from July 1, 1996 to December  31,
                           1996, and incorporated by reference).

                  4.1      Registration  Rights  Agreement  dated June 18,  1997
                           among DynaGen and the Shareholders.

                  4.2      Secured Promissory Note dated June 18, 1997 issued by
                           DynaGen to Eric C. Hagerstrand.

                  4.3      Secured Promissory Note dated June 18, 1997 issued by
                           DynaGen to Dennis B. Smith.

                  4.4      Secured Promissory Note dated June 18, 1997 issued by
                           DynaGen to Thomas L. Canning.

                  4.5      Pledge  Agreement  dated June 18, 1997 among DynaGen
                           and the Shareholders.

                  4.6      Secured Promissory Note dated June 18, 1997 issued by
                           DynaGen to Sirrom.





                                      -5-


                  4.7      Secured Promissory Note dated June 18, 1997 issued by
                           DynaGen to Odyssey.

                  4.8      Stock Purchase  Warrant dated June 18, 1997 issued by
                           DynaGen to Sirrom.

                  4.9      Stock Purchase  Warrant dated June 18, 1997 issued by
                           DynaGen to Odyssey.

                  4.10     Pledge and  Security  Agreement  dated June 18,  1997
                           between DynaGen and  Sirrom.

                  4.11     Subordinated  Note  dated  June 18,  1997  issued  by
                           DynaGen to Coutts & Co. AG.

                  4.12     Bridge  Financing  Purchase  Agreement dated June 16,
                           1997 between DynaGen and Coutts & Co. AG.

                  4.13     Certificate of  Designations,  Preferences and Rights
                           of Series A Preferred Stock of Dynagen.

                  4.14     Securities  Purchase  Agreement  dated June 16,  1997
                           among   DynaGen  and  the   purchasers  of  Series  A
                           Preferred Stock.

                  4.15     Registration  Rights  Agreement  dated June 16,  1997
                           among   DynaGen  and  the   purchasers  of  Series  A
                           Preferred Stock.

                  4.16     Form of Common Stock Purchase  Warrant dated June 18,
                           1997 issued by DynaGen to the  purchasers of Series A
                           Preferred Stock.

                  4.17     Certificate of  Designations,  Preferences and Rights
                           of Series B Preferred Stock of Dynagen.

                  4.18     Securities  Purchase  Agreement  dated June 17,  1997
                           between  DynaGen and Julius Baer  Securities  Inc. as
                           agent for certain non-U.S. persons.

                  4.19     Registration  Rights  Agreement  dated June 17,  1997
                           between  DynaGen and Julius Baer  Securities  Inc. as
                           agent for certain non-U.S. persons.

                  4.20     Stock Purchase  Warrant dated June 18, 1997 issued by
                           Superior to Sirrom.

                  4.21     Stock Purchase  Warrant dated June 18, 1997 issued by
                           Superior to Odyssey. 







                                      -6-


                  4.22     Revolving Note dated June 18, 1997 issued by Superior
                           to Huntington National Bank.

                  99.1     Loan  Agreement  dated June 18,  1997 among  DynaGen,
                           Sirrom  and  Odyssey.
                        
                  99.2     Security Agreement dated June 18, 1997 among DynaGen,
                           Sirrom  and Odyssey.

                  99.3     Amended  and  Restated  Loan and  Security  Agreement
                           dated June 18, 1997 among  Huntington  National Bank,
                           Superior and DynaGen.

                  99.4     Continuing  Guaranty  Unlimited  dated June 18,  1997
                           from DynaGen to Huntington National Bank.






                                      -7-


                                    SIGNATURE


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                    DYNAGEN, INC.



                                    By:/s/ Dhananjay G. Wadekar
                                       ----------------------------------- 

                                    Title: Executive Vice President
                                       ----------------------------------- 



Dated:  July 2, 1997






                                      -8-


                                  EXHIBIT INDEX
                                  -------------

Exhibit
Numbers           Exhibits
- -------           --------

2.1               Agreement  and  Plan of  Merger  dated  March  7,  1997  among
                  DynaGen,   DynaGen   Acquisition   Corp.,   Superior  and  the
                  Shareholders  (filed as  Exhibit  2c to  DynaGen's  Transition
                  report on Form  10-K for the  transition  period  from July 1,
                  1996 to December 31, 1996, and incorporated by reference).

4.1               Registration  Rights  Agreement  dated  June  18,  1997  among
                  DynaGen and the Shareholders.

4.2               Secured  Promissory Note dated June 18, 1997 issued by DynaGen
                  to Eric C. Hagerstrand.

4.3               Secured  Promissory Note dated June 18, 1997 issued by DynaGen
                  to Dennis B. Smith.

4.4               Secured  Promissory Note dated June 18, 1997 issued by DynaGen
                  to Thomas L. Canning.

4.5               Pledge  Agreement  dated June 18, 1997  among DynaGen and  the
                  Shareholders.

4.6               Secured  Promissory Note dated June 18, 1997 issued by DynaGen
                  to Sirrom.

4.7               Secured  Promissory Note dated June 18, 1997 issued by DynaGen
                  to Odyssey.

4.8               Stock  Purchase  Warrant dated June 18, 1997 issued by DynaGen
                  to Sirrom.

4.9               Stock  Purchase  Warrant dated June 18, 1997 issued by DynaGen
                  to Odyssey.

4.10              Pledge  and  Security  Agreement dated  June 18,  1997 between
                  DynaGen and Sirrom.

4.11              Subordinated  Note  dated June 18,  1997  issued by DynaGen to
                  Coutts & Co. AG.

4.12              Bridge  Financing  Purchase  Agreement  dated  June  16,  1997
                  between DynaGen and Coutts & Co. AG.

4.13              Certificate of Designations,  Preferences and Rights of Series
                  A Preferred Stock of Dynagen.

4.14              Securities  Purchase  Agreement  dated  June  16,  1997  among
                  DynaGen and the purchasers of Series A Preferred Stock.







                                      -9-


4.15              Registration  Rights  Agreement  dated  June  16,  1997  among
                  DynaGen and the purchasers of Series A Preferred Stock.

4.16              Form of Common  Stock  Purchase  Warrant  dated June 18,  1997
                  issued by  DynaGen  to the  purchasers  of Series A  Preferred
                  Stock.

4.17              Certificate of Designations,  Preferences and Rights of Series
                  B Preferred Stock of Dynagen.

4.18              Securities  Purchase  Agreement  dated June 17,  1997  between
                  DynaGen and Julius Baer  Securities  Inc. as agent for certain
                  non-U.S. persons.

4.19              Registration  Rights  Agreement  dated June 17,  1997  between
                  DynaGen and Julius Baer  Securities  Inc. as agent for certain
                  non-U.S. persons.

4.20              Stock Purchase  Warrant dated June 18, 1997 issued by Superior
                  to Sirrom.

4.21              Stock Purchase  Warrant dated June 18, 1997 issued by Superior
                  to Odyssey.

4.22              Revolving  Note  dated June 18,  1997  issued by  Superior  to
                  Huntington National Bank.

99.1              Loan Agreement  dated June 18, 1997 among  DynaGen, Sirrom and
                  Odyssey. 

99.2              Security  Agreement dated June 18, 1997 among DynaGen,  Sirrom
                  and Odyssey.

99.3              Amended and Restated  Loan and Security  Agreement  dated June
                  18, 1997 among Huntington National Bank, Superior and DynaGen.

99.4              Continuing Guaranty Unlimited dated June 18, 1997 from DynaGen
                  to Huntington National Bank


                                                                     EXHIBIT 4.1


                          REGISTRATION RIGHTS AGREEMENT

         This  REGISTRATION  RIGHTS  AGREEMENT  (the  "AGREEMENT")  is made  and
entered  into as of June  18,  1997  by and  among  DYNAGEN,  INC.,  a  Delaware
corporation  ("DYNAGEN"  or the  "COMPANY"),  and  the  former  shareholders  of
Superior  Pharmaceutical Company, a corporation organized under the laws of Ohio
("SUPERIOR"),  and each of Dennis Smith,  Eric C. Hagerstrand and Thomas Canning
(collectively the "SHAREHOLDERS" and individually a "SHAREHOLDER").

                                    RECITALS

         A. The Company,  Superior and the Shareholders are parties to a certain
Merger Agreement dated as of March 7, 1997, as amended (the "MERGER AGREEMENT"),
pursuant to which  DynaGen  will  acquire  Superior  for cash  consideration  of
US$6,500,000,  a promissory note in the principal amount of $5,000,000,  and the
issuance of 1,666,667 shares of DynaGen's Common Stock, $.01 par value per share
(the "DYNAGEN COMMON STOCK"), as set forth in the Merger Agreement.

         B. The execution and delivery of this  Agreement by the parties  hereto
is a condition  precedent to the  obligations  of the parties to consummate  the
transactions under the Merger Agreement.

                                    AGREEMENT

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
covenants contained herein, the parties hereto agree as follows:

         1.       DEFINITIONS.

         For the  purposes  of this  Agreement,  the  following  terms  have the
meanings indicated below:

                  1933 ACT.  The  Securities  Act of 1933,  as amended,  and the
rules and regulations promulgated thereunder, as in effect from time to time

                  1934 ACT. The Securities Exchange Act of 1934, as amended, and
the rules and  regulations  promulgated  thereunder,  as in effect  from time to
time.

                  BUSINESS DAY. Each Monday,  Tuesday,  Wednesday,  Thursday and
Friday  that  is  not a day on  which  banking  institutions  in  New  York  are
authorized or obligated by law or executive order to close.

                  COMMISSION.   The  United  States   Securities   and  Exchange
Commission.

                  EFFECTIVE TIME. The "Effective  Time" as defined in the Merger
Agreement.




                                      -2-


                  HOLDER.  Any person  owning  Registrable  Securities  who is a
party to this Agreement,  and any transferee thereof in accordance with Sections
3 and 10 of this Agreement.

                  PROSPECTUS.   The  prospectus  included  in  any  Registration
Statement,  as amended or supplemented by any prospectus supplement  (including,
without limitation,  any prospectus  supplement with respect to the terms of the
offering  of  any  portion  of  the  Registrable   Securities  covered  by  such
Registration  Statement),  and  all  other  amendments  and  supplements  to the
Prospectus,  including post-effective  amendments, and all material incorporated
by reference or deemed to be incorporated by reference in such Prospectus.

                  REGISTER, REGISTRATION AND REGISTERED. A registration effected
by preparing and filing a  registration  statement or similar  document with the
Commission in compliance  with the 1933 Act, and the  declaration or ordering of
effectiveness of such registration statement or document.

                  REGISTRABLE  SECURITIES.  The shares of DynaGen  Common  Stock
issued to and  received by the  Shareholders  pursuant to the Merger  Agreement,
including,  without limitation,  the Adjustment Shares, as defined in the Merger
Agreement, and any securities that may be issued by the Company or any successor
to the  Company  from  time to time with  respect  to, in  exchange  for,  or in
replacement  of  such  shares  of  DynaGen  Common  Stock,  including,   without
limitation,  securities  issued as a stock  dividend  on or  pursuant to a stock
split or in connection with a combination of shares,  recapitalization,  merger,
consolidation,   or  other  similar  reorganization  of  DynaGen  Common  Stock;
provided, however, that those shares as to which the following apply shall cease
to be Registrable  Securities:  (a) a Registration Statement with respect to the
sale of such  Registrable  Securities shall have become effective under the 1933
Act and such  Registrable  Securities  shall  have been  disposed  of under such
Registration  Statement;  (b) such  Registrable  Securities  shall  have  become
transferable  (whether  or not so  transferred)  in  accordance  with the resale
provisions of Rule 144 or any successor  rule or provision,  under the 1933 Act;
(c) such Registrable  Securities shall have been transferred in a transaction in
which the  Shareholder's  rights and  obligations  under this Agreement were not
properly  assigned in accordance  with this Agreement;  or (d) such  Registrable
Securities shall have ceased to be outstanding.

                  REGISTRATION  EXPENSES. All expenses incident to the Company's
performance  of  or  compliance  with  Section  2  hereof,  including,   without
limitation:  (i) all  registration  and filing fees (including  filing fees with
respect to the Commission and to the National Association of Securities Dealers,
Inc.  and  listing  fees of the Nasdaq  SmallCap  Market  System),  all fees and
expenses of complying with state  securities or "blue sky" laws  (including fees
and  disbursements  of  underwriters'  counsel in connection with any "blue sky"
memorandum  or  survey,   but  excluding  any  fees  and  expenses  for  foreign
qualification in such  jurisdictions);  (ii) all printing  expenses,  (including
expenses of printing certificates for Registrable  Securities in a form eligible
for  deposit  with  the  DTC  and  of  printing  prospectuses  included  in  any
Registration Statement and all registrars' and transfer agents' fees); (iii) all
fees  and  disbursements  of  the  Company's  counsel  and  independent   public
accountants;  (iv)  liability  insurance  under the 1933 Act,  if the Company so
desires  such  insurance;  (v) fees and  expenses  of all  attorneys,  advisers,
appraisers  and other persons  retained by the Company or any  subsidiary of the
Company;  (vi)  internal  expenses of the Company  and the  subsidiaries  of the
Company (including,  without  limitation,  all salaries and expenses of officers
and  employees  of the Company and the  subsidiaries  of the Company


                                      -3-


performing legal or accounting  duties);  (vii) the expense of any annual audit;
(viii) the fees and  expenses  incurred  in  connection  with the listing of the
securities to be registered on any  securities  exchange;  and (ix) the expenses
relating  to  printing,   wordprocessing   and   distributing  all  Registration
Statements,  underwriting agreements,  securities sales agreements and any other
documents necessary in order to comply with this Agreement;  provided,  however,
that Registration Expenses shall not include the fees and expenses of counsel to
the holders of Registrable Securities, or underwriters' discounts or commissions
associated with the sale of the Registrable Securities.

                  REGISTRATION  STATEMENT. A registration statement prepared and
filed with the Commission in compliance with the 1933 Act that covers any of the
Registrable  Securities pursuant to the provisions of this Agreement,  including
the  Prospectus,  amendments  and  supplements to such  Registration  Statement,
including post-effective amendments, all exhibits, and all material incorporated
by reference  or deemed to be  incorporated  by  reference in such  Registration
Statement.

                  RULE  144.  Rule 144  promulgated  under  the 1933 Act and the
rules,  regulations and interpretations  thereof issued by the Commission as may
be in effect from time to time.

                  SELLER. Any person, including any Holder,  participating in an
offering  of  any  Registrable  Securities  of  the  Company  pursuant  to  this
Agreement.

                  SELLING EXPENSES.  All applicable  transfer taxes and any fees
and  disbursements of any counsel,  accountants or other advisors for any Seller
of the Registrable Securities being registered.

                  SHELF  REGISTRATION.  A  registration  effected  pursuant to a
shelf Registration  Statement of the Company,  on an appropriate form under Rule
415  under  the  1933  Act,  or any  similar  rule  that may be  adopted  by the
Commission,  all amendments  and  supplements  to such  Registration  Statement,
including  post-effective  amendments,  in each case  including  the  Prospectus
contained  therein,  all  exhibits  thereto  and all  material  incorporated  by
reference  therein.  A Registration  Statement  relating to a Shelf Registration
shall be referred  to herein as the "SHELF  REGISTRATION  STATEMENT."  The Shelf
Registration  Statement  shall be  effected  on Form S-3 or any  successor  form
prescribed by the Commission.

         2.  SHELF REGISTRATION.

         2.1 DEMAND  REGISTRATION  RIGHT.  Subject to the  limitations set forth
elsewhere in this Section 2,  commencing on or after eleven (11) months from the
Effective Time, and subject to the resale restrictions and limitations set forth
in Section 3 hereof,  upon the request of all of the  Shareholders  DynaGen will
use its best efforts to promptly effect  qualification  and  registration of the
Registrable  Securities  under  the  Securities  Act on a Form S-3  registration
statement  (or any  other  registration  statement  form  for  which  it is then
eligible,  other than Form S-1) as a Shelf  Registration as soon as practicable,
but in any event no later than twelve  months from the Effective  Time.  DynaGen
shall not be required to effect more than one  registration on Form S-3 pursuant
to the  provisions  of this  Section 2. DynaGen and the  Shareholders  shall use
reasonable efforts to coordinate sales of the Registrable Securities pursuant to
a Form S-3  registration


                                      -4-


statement  with DynaGen's  market makers in a manner to ensure  stability in the
trading price of DynaGen Common Stock.

         2.2 LIMITATION ON SHELF REGISTRATION  OBLIGATION.  Notwithstanding  the
provisions  of Section 2.1, and subject to the  limitations  described  below in
this  Section  2,  if,  prior  to the  filing  or  effective  date of the  Shelf
Registration  Statement  referred  to in Section 2.1 above,  the  Company  shall
furnish to the Holders a certificate  issued by the Board of Directors  upon the
advice of counsel and signed by the  President of the Company  stating  that, in
their good faith judgment:

                  (a) the  filing of the  Shelf  Registration  Statement  or the
offering of securities  pursuant  thereto would  materially and adversely affect
(i) a pending or  scheduled  public  offering of  DynaGen's  securities,  (ii) a
pending  or  proposed  acquisition,   merger,   consolidation,   reorganization,
strategic alliance, corporate partnership,  restructuring or similar transaction
involving  DynaGen,  which in each case is material to the  business of DynaGen,
(iii) bona fide  negotiations,  discussions  or proposals with respect to any of
the foregoing types of material  transactions,  or (iv) the financial condition,
prospects,  stock price or strategy of DynaGen in  connection  with the proposed
disclosure  of any  pending  transaction  or pending or  threatened  litigation,
claim, assessment or government investigation which may be required thereby; and

                  (b) in the event the Shelf  Registration  Statement  were then
effective  and  sales of  Registrable  Securities  were  being  made or  offered
thereunder,  and  disclosure  of all  material  information  with respect to the
transactions  mentioned  in the  preceding  paragraph  had not been  made,  such
circumstances would cause a violation of the 1933 Act or the 1934 Act and result
in potential liability to DynaGen and/or the Shareholders;

then the Company shall have the right,  subject to the  limitations set forth in
Section 2.3(d) hereof, to defer the filing or effectiveness, as the case may be,
of such Shelf Registration Statement for such period of time as any of the above
circumstances  shall  continue,  such period not to exceed 60 days following the
date of  suspension,  provided  that the Company may not exercise  such right to
defer the filing or effectiveness more than once in any six-month period.

         2.3  SELLING  PROCEDURES;   SUSPENSION.   Each  Holder  of  Registrable
Securities  agrees to give written  notice to the general  counsel and the chief
accounting  officer of the Company at least two (2)  Business  Days prior to any
intended  sale  or  distribution  of  Registrable  Securities  under  the  Shelf
Registration Statement, which notice shall specify the date on which such Holder
intends to begin such sale or  distribution.  As soon as  practicable  after the
date such  notice is received by the  Company,  and in any event  within two (2)
Business Days after such date,  the Company  shall comply with either  paragraph
(a) or (b) below.

                  (a) Except in the event that paragraph (b) below applies,  the
Company shall (i) if deemed necessary by the Company,  prepare and file with the
Commission a post-effective  amendment to the Shelf Registration  Statement or a
supplement  to the  related  Prospectus  or a  supplement  or  amendment  to any
document  incorporated  therein by reference or file any other required document
so that such  Registration  Statement will not contain an untrue  statement of a
material fact or omit to state a material fact required to be stated  therein or
necessary  to make the  statements  therein  not  misleading,  and so  that,  as
thereafter  delivered to purchasers  of the  Registrable  Securities  being sold
thereunder,  such Prospectus will not contain an untrue  statement



                                      -5-


of a  material  fact or omit to state a  material  fact  required  to be  stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances  under  which they were made,  not  misleading;  (ii)  provide the
Holders  of the  Registrable  Securities  who gave  such  notice  copies  of any
documents filed pursuant to Section 2.3(a)(i); and (iii) inform each such Holder
that the Company has complied  with its  obligations  in Section  2.3(a)(i)  (or
that,  if the  Company  has  filed  a  post-effective  amendment  to  the  Shelf
Registration  Statement which has not yet been declared  effective,  the Company
will notify each such Holder to that effect, will use its best efforts to secure
the effectiveness of such  post-effective  amendment and will immediately notify
each such Holder when the amendment has become  effective).  Each Holder who has
given notice of intention to distribute such Holder's Registrable  Securities in
accordance with Section 2.3 hereof (a "NOTICE  HOLDER") shall sell all or any of
such Registrable  Securities  pursuant to the Shelf  Registration  Statement and
related  Prospectus  only during the 90-day period  commencing  with the date on
which the  Company  gives  notice,  pursuant  to Section  2.3(a)(iii),  that the
Registration Statement and Prospectus may be used for such purpose, which notice
must be given no later than the close of  business  on the second  Business  Day
after the notice  described in the first  paragraph of this Section 2.3 is given
(such 90-day period is referred to as a "SELLING  PERIOD").  The Notice  Holders
will not sell any Registrable Securities pursuant to such Registration Statement
or Prospectus after such Selling Period without giving a new notice of intention
to sell pursuant to Section 2.3 hereof and  receiving a further  notice from the
Company pursuant to Section 2.3(a)(iii) hereof or paragraph (b) below.

                  (b) In the event (i) of any request by the  Commission  or any
other federal or state governmental authority during the period of effectiveness
of the Shelf  Registration  Statement for  amendments or  supplements to a Shelf
Registration Statement or related Prospectus or for additional information; (ii)
of the issuance by the  Commission  or any other  federal or state  governmental
authority of any stop order suspending the effectiveness of a Shelf Registration
Statement or the initiation of any  proceedings  for that purpose;  (iii) of the
receipt by the Company of any notification with respect to the suspension of the
qualification  or  exemption  from  qualification  of  any  of  the  Registrable
Securities for sale in any  jurisdiction or the initiation or threatening of any
proceeding  for  such  purpose;   (iv)  of  any  event  or  circumstance   which
necessitates  the making of any changes in the Shelf  Registration  Statement or
Prospectus, or any document incorporated or deemed to be incorporated therein by
reference, so that, in the case of the Shelf Registration Statement, it will not
contain  any untrue  statement  of a material  fact or any  omission  to state a
material fact required to be stated  therein or necessary to make the statements
therein  not  misleading,  and that in the case of the  Prospectus,  it will not
contain  any untrue  statement  of a material  fact or any  omission  to state a
material fact required to be stated  therein or necessary to make the statements
therein,  in the light of the  circumstances  under  which they were  made,  not
misleading;  or (v) that, in the good faith  judgment of the Company's  Board of
Directors,  upon the advice of counsel,  in  accordance  with the  provision  of
Section  2.2, it is advisable  to suspend use of the  Prospectus  for a discrete
period of time due to pending  corporate  developments,  public filings with the
Commission or similar events;  then, subject to paragraph (d) below, the Company
shall deliver a certificate  in writing to the Notice  Holders (the  "SUSPENSION
NOTICE") to the effect of the  foregoing  and,  upon receipt of such  Suspension
Notice,   each  such  Notice  Holder's  Selling  Period  will  not  commence  (a
"SUSPENSION")  until such Notice Holder's  receipt of copies of the supplemented
or amended  Prospectus  provided for in Section 2.3(a)(i) hereof, or until it is
advised in writing by the  Company  that the  Prospectus  may be used and it has



                                      -6-



received copies of any additional or supplemental  filings that are incorporated
or deemed incorporated by reference in such Prospectus.

                  (c) In the event any of the events or circumstances  listed in
the foregoing paragraph (b) occur or exist after a Selling Period has commenced,
subject to paragraph (d) below, the Company shall have the same right to suspend
such Selling Period by delivery of a Suspension Notice as the Company would have
had if the Selling  Period had not yet commenced,  and any such  suspension of a
Selling  Period  shall  be  deemed  included  within  the  meaning  of the  term
"Suspension" for all purposes under this Agreement.

                  (d) In the event of any Suspension,  or any delay in effecting
the Shelf  Registration  under Section 2.2 above,  the Company will use its best
efforts to ensure that the use of the  Prospectus so suspended or delayed may be
commenced  or  resumed,  as the case may be,  and that  any  Selling  Period  so
suspended  will commence or resume,  as the case may be, as soon as  practicable
and,  in the case of a  pending  development,  filing  or event  referred  to in
Section  2.3(b)(iv)  or (v) hereof,  as soon,  in the judgment of the  Company's
Board of Directors  (in  accordance  with the  provisions  of Section  2.2),  as
disclosure of the material relating to such pending development, filing or event
would not have an adverse  effect on the  Company's  ability to  consummate  the
transaction,  if any,  to which  such  development,  filing  or  event  relates.
Notwithstanding  any other provision of this  Agreement,  the Company shall have
the right to cause a maximum  of two (2)  Suspensions,  neither  of which may be
within 30 days of the other,  as provided  above  (including  for this purpose a
delay in effecting the Shelf Registration  pursuant to Section 2.2 above) during
any 12-month period after the initial  effective date of the Shelf  Registration
Statement,  and the total number of days in any 12-month  period  during which a
Suspension or  Suspensions  (including for this purpose a delay in effecting the
Shelf  Registration  Statement  pursuant  to Section 2.2 above) may be in effect
shall not exceed 120 days.

                  (e) Subject to the  provisions  of Sections  2.2 and 2.3,  the
Company  will use its best efforts to maintain  the  effectiveness  of the Shelf
Registration  Statement until the date that is twenty-four  (24) months from the
initial  effective date of the Shelf  Registration  Statement,  except that this
date  shall be  extended  by the  aggregate  number  of days,  beginning  on the
effective date of the Shelf  Registration  Statement  through  twenty-four  (24)
months from such initial  effective  date,  during which the Shelf  Registration
Statement is not available for sales of the Registrable  Securities due to (i) a
Suspension of the Shelf  Registration  Statement  under Section 2.3, or (ii) the
failure of the Company to qualify for the use of Form S-3 because of its failure
to file on a timely  basis all reports  required to be filed under the 1934 Act.
The  Company  from  time to time  will  amend or  supplement  such  Registration
Statement and the Prospectus to the extent necessary to comply with the 1933 Act
and any applicable state securities statue or regulation.  The Company will also
provide  each  Holder  of  Registrable  Securities  with as many  copies  of the
Prospectus  contained  in  such  Registration  Statement  as it  may  reasonably
request.

         3.  RESTRICTIONS  ON  TRANSFER  OF  SHARES.  Notwithstanding  any other
provision  in this  Agreement,  each  Shareholder  agrees  not to sell,  assign,
transfer,  grant an option for,  engage in any derivative  security  transaction
with  respect to, or otherwise  dispose of in any manner any of the  Registrable
Securities,  whether to the public in the open market or in privately-negotiated
transactions,  except with respect to those shares for which the restrictions on
transfer  set forth in this  Section  shall  lapse in the  increments  set forth
below. The amount of Registrable  Securities held by each Shareholder  listed on
Exhibit A shall then become eligible for the registration rights



                                      -7-


and be released from the restrictions on transfer set forth in this Agreement in
the following increments:  (i) no sales,  transfers or other dispositions of the
Registrable  Securities may be made during the twelve (12) months  commencing on
the Effective Time and ending at the end of the day on the one-year  anniversary
of the Effective  Time;  (ii)  commencing on the day  immediately  following the
one-year  anniversary  of  the  Effective  Time  the  Shareholders,  as  amongst
themselves, may sell during any three-month period up to an aggregate of 350,000
shares of DynaGen  Common Stock.  The  Shareholders  may not cumulate such sales
beyond any three-month period, such that if any portion of the 350,000 shares is
not sold in such  three-month  period,  the  unsold  shares  may not be  carried
forward to the next three-month period for purposes of determining the aggregate
amount of DynaGen Common Stock that may be sold in the next three-month period.

         In the event of any  attempted  transfer of the  Registrable  Shares in
violation of the foregoing  restrictions,  the registration  rights set forth in
this Agreement shall  automatically  expire with respect to each Shareholder who
transfers such Registrable Shares in violation of the foregoing restrictions. In
the event of any  violation  of these  restrictions,  the Company  shall have to
right to issue stop transfer  instructions  to its transfer agent to prevent any
threatened or continuing violation of these transfer  restrictions and to seek a
decree for specific performance of the provisions of this Agreement.

         Notwithstanding the foregoing, a Shareholder may (i) transfer up to 30%
of his Registrable Securities by way of gift for estate planning purposes to any
member of his  immediate  family or to any  trust  for the  benefit  of any such
family  member,  provided  that any  transferee  shall agree in writing with the
Company,  as a condition  precedent to such transfer,  to be bound by all of the
provisions of this Agreement to the same extent as if such  transferee  were the
original  Shareholder  hereunder,  or  (ii)  transfer  any  of  his  Registrable
Securities by will or the laws of descent and  distribution  to the heirs of the
Shareholder,  or in the event of the disability of the Shareholder, to the legal
representatives  of the  Shareholder,  in which event each such transferee shall
also be bound (and shall agree in writing to be bound) by all of the  provisions
of this  Agreement  to the same extent as if such  transferee  were the original
Shareholder hereunder.

         The provisions of this Section 3 shall not apply to a pledge,  mortgage
or other encumbrance of the Registrable  Securities pursuant to a bona fide loan
transaction  in  which  the  Registrable  Securities  are  given  as  additional
collateral  to  secure  the  loan  and the loan  obligation  is a full  recourse
obligation  with respect to collateral,  with recourse to collateral  other than
solely the  Registrable  Securities.  Any pledgee,  mortgagee or other permitted
transferee of the  Registrable  Securities  must agree in writing to be bound by
all of the provisions of this Agreement,  including the trading  restrictions of
this Section 3.

         4.  EXPENSES.  The  Company  will  pay  all  Registration  Expenses  in
connection  with the  registration  of  Registrable  Securities  effected by the
Company  pursuant to Section 2.  Holders of  Registrable  Securities  registered
pursuant to this Agreement shall pay all Selling  Expenses  associated with such
registration,  with  each  Holder  bearing  a pro rata  portion  of the  Selling
Expenses  based upon the number of  Registrable  Securities  registered  by each
Holder.

         5.  EXPIRATION OF REGISTRATION  RIGHTS.  The obligations of the Company
under Sections 2 and 6 hereof shall expire on the date that is twenty-four  (24)
months from the Effective  Time,  except that this date shall be extended by the
aggregate  number of days,  beginning on the Effective Time through  twenty-four
(24) months from the Effective  Time,  during which a



                                      -8-


Registration  Statement  by  the  Company  is not  available  for  sales  of the
Registrable  Securities due to (i) a delay in the filing or effectiveness of the
Shelf  Registration  Statement  under Section 2.1 or 2.2, (ii) a Suspension of a
Registration Statement under Section 2.3, or (iii) the failure of the Company to
qualify for the use of Form S-3 because of its failure to file on a timely basis
all  reports  required to be filed under the 1934 Act.  The  obligations  of the
Company  under  Sections 2 and 6 hereof  shall expire with respect to any Holder
who is not an  executive  officer  (as defined in Section 16 of the 1934 Act) or
director of Company and is able to sell the Registrable  Securities  pursuant to
Rule 144 of the 1933 Act.

         6.  REGISTRATION  PROCEDURES.  In connection  with the  registration of
Registrable Securities under this Agreement, and subject to the other provisions
of this Agreement, the Company shall:

                  (a) use its best efforts to cause the  Registration  Statement
filed in accordance  with Section 2 to become  effective as soon as  practicable
after the date of filing thereof;

                  (b) prepare and file with the Commission  such  amendments and
supplements to such Registration Statement and the Prospectus used in connection
therewith as may be necessary to keep such Registration  Statement  continuously
effective for the shorter of (i) the duration of its  registration  obligations,
or (ii) until there are no  Registrable  Securities  outstanding,  and to comply
with the  provisions  of the 1933 Act with  respect  to the  disposition  of the
Registrable Securities;

                  (c)  furnish to each  Seller of  Registrable  Securities  such
number of copies of the Prospectus  included in such  Registration  Statement as
such  Seller  may  reasonably  request  in  order  to  facilitate  the  sale  or
disposition of such Registrable Securities;

                  (d) use its best efforts to register or qualify all securities
covered by such Registration Statement under such other securities or "blue sky"
laws of such jurisdictions as each Seller shall reasonably  request,  and do any
and all other acts and things  that may be  necessary  to enable  such Seller to
consummate the disposition in such  jurisdictions of its Registrable  Securities
covered by such  Registration  Statement,  except that the Company shall not for
any such  purpose be required to qualify  generally  to do business as a foreign
corporation in any  jurisdiction  wherein it is not so qualified,  or to subject
itself to taxation in respect of doing business in any such jurisdiction,  or to
consent to general service of process in any such jurisdiction;

                  (e) notify each Seller of  Registrable  Securities  covered by
such Registration  Statement,  at any time when a Prospectus relating thereto is
required to be delivered  under the 1933 Act, of the happening of any event as a
result of which the Prospectus included in such Registration  Statement, as then
in effect, includes an untrue statement of a material fact or omits to state any
material fact required to be stated  therein or necessary to make the statements
therein not misleading in light of the  circumstances  then existing or if it is
necessary to amend or supplement  such Prospectus to comply with the law, and at
the request of any such Seller,  prepare and furnish to such Seller a reasonable
number of copies of a supplement to or an amendment of such Prospectus as may be
necessary so that, as thereafter delivered to the purchasers of such Registrable
Securities or securities,  such  Prospectus,  as amended or  supplemented,  will
comply with the law;




                                      -9-



                  (f) timely file with the  Commission  such  information as the
Commission may prescribe under Section 13 or 15(d) of the 1934 Act and otherwise
use its best efforts to ensure that the public information  requirements of Rule
144 under the 1933 Act are  satisfied  with respect to the Company.  The Company
shall furnish to any Holder of Registrable  Securities,  upon request, copies of
the  Company's  most recent  annual and  quarterly  reports  and other  publicly
available documents filed with the Commission as a Holder may reasonably request
in availing  itself of any rule or  regulation of the  Commission  allowing such
Holder to sell Registrable Securities without registration.

                  (g) use its  best  efforts  to  qualify  such  securities  for
inclusion  in the Nasdaq  SmallCap  Market,  and  provide a  transfer  agent and
registrar for such  Registrable  Securities not later than the effective date of
such Registration Statement; and

                  (h) issue to any  person to which  any  Holder of  Registrable
Securities  may  sell  such  Registrable  Securities  in  connection  with  such
registration  certificates  evidencing such Registrable  Securities  without any
legend restricting the transferability of the Registrable Securities.

                  From time to time,  the Company will amend or supplement  such
Registration  Statement  and the  Prospectus  contained  therein  to the  extent
necessary  to  comply  with  the 1933 Act and any  applicable  state  securities
statute or  regulation.  The Company will also provide the holder of Registrable
Securities  with  as  many  copies  of the  Prospectus  contained  in  any  such
Registration Statement as it may reasonably request.

         7.  1934 ACT  REGISTRATION.  The  Company  shall  timely  file with the
Commission  such  information  as the Commission may require under Section 13 or
15(d) of the 1934 Act; and in such event, the Company shall use its best efforts
to take all action  pursuant to Rule 144(c) as may be required as a condition to
the availability of Rule 144 under the 1933 Act (or any successor exemptive rule
hereinafter  in effect) with respect to the DynaGen  Common  Stock.  The Company
shall furnish to any holder of Registrable Securities forthwith upon request (i)
a written  statement  by the  Company as to its  compliance  with the  reporting
requirements of Rule 144(c),  (ii) a copy of the most recent annual or quarterly
report  of the  Company  as filed  with the  Commission,  and (iii)  such  other
publicly-filed  reports  and  documents  as a holder may  reasonably  request in
availing itself of any rule or regulation of the Commission allowing a holder to
sell any such Registrable Securities without registration.

         8. SHAREHOLDER  INFORMATION.  It shall be a condition  precedent to the
obligations  of the Company to take any action  pursuant to this  Agreement that
all  Shareholders  of Registrable  Securities  shall furnish to the Company such
information  regarding themselves,  the Registrable  Securities held by them and
the intended  method of disposition of such  Registrable  Securities as shall be
reasonably  required to effect the registration of their Registrable  Securities
and to execute  such  documents  in  connection  with such  registration  as the
Company may reasonably request.

         9.  INDEMNIFICATION  AND  CONTRIBUTION.  In the event  any  Registrable
Securities are included in a Registration Statement under this Agreement:

                  (a) The Company will  indemnify and hold harmless each Seller,
the officers,  directors,  partners,  agents and  employees of each Seller,  any
underwriter  (as  defined in the 1933



                                      -10-


Act) for such  Seller and each  person,  if any,  who  controls  such  Seller or
underwriter  within  the  meaning of the 1933 Act or the 1934 Act,  against  any
losses,  claims,  damages or  liabilities  (joint or  several) to which they may
become  subject  under the 1933 Act, the 1934 Act or other federal or state law,
insofar as such losses,  claims,  damages or liabilities  (or actions in respect
thereof)  arise  out of or are  based  upon  any  of the  following  statements,
omissions or violations (collectively,  a "VIOLATION"): (i) any untrue statement
or alleged untrue  statement of a material fact  contained in such  Registration
Statement,  including any preliminary  Prospectus or final Prospectus  contained
therein or any amendments or supplements  thereto;  (ii) the omission or alleged
omission to state  therein a material  fact  required to be stated  therein,  or
necessary to make the statements  therein,  in light of the circumstances  under
which  they were  made,  not  misleading;  or (iii)  any  violation  or  alleged
violation by the Company of the 1933 Act, the 1934 Act, any state securities law
or any rule or  regulation  promulgated  under the 1933 Act, the 1934 Act or any
state securities law; and the Company will reimburse each such Seller,  officer,
director,  partner,  agent, employee,  underwriter or controlling person for any
reasonable  legal or other  expenses  reasonably  incurred by them in connection
with  investigating  or defending  any such loss,  claim,  damage,  liability or
action;  provided,  however,  that the  indemnity  agreement  contained  in this
Section  9(a) shall not apply to amounts  paid in  settlement  of any such loss,
claim,  damage,  liability or action if such settlement is effected  without the
consent of the Company  (which  consent  shall not be  unreasonably  withheld or
delayed),  nor shall the  Company  be liable in any such case for any such loss,
claim,  damage,  liability  or action to the extent  that it arises out of or is
based upon a Violation  which  occurs in reliance  upon and in  conformity  with
written  information  furnished  expressly  for  use  in  connection  with  such
registration by any such Seller, underwriter or controlling person.

                  (b) Each Seller will, severally and not jointly, indemnify and
hold harmless the Company, each of its officers, directors,  partners, agents or
employees,  each person,  if any, who controls the Company within the meaning of
the 1933 Act,  any  underwriter  and any other  Seller or any of its  directors,
officers,  partners, agents or employees or any person who controls such Seller,
against any losses,  claims,  damages or liabilities (joint or several) to which
the Company or any such director, officer, partner, agent, employee, controlling
person or  underwriter,  or other such  Seller or  director,  officer,  partner,
agent,  employee or controlling  person may become subject,  under the 1933 Act,
the 1934 Act or other  federal or state law,  insofar  as such  losses,  claims,
damages or liabilities (or actions in respect thereto) arise out of or are based
upon any  Violation,  in each case to the extent (and only to the  extent)  that
such  Violation   occurs  in  reliance  upon  and  in  conformity  with  written
information  furnished by such Seller  expressly for use in connection with such
registration;  and each such Seller will,  severally and not jointly,  reimburse
any reasonable legal or other expenses reasonably incurred by the Company or any
such  director,  officer,  partner,  agent,  employee,   controlling  person  or
underwriter,  other  Seller,  officer,  director,  partner,  agent,  employee or
controlling  person in connection with investigating or defending any such loss,
claim, damage,  liability or action.  Notwithstanding anything contained in this
Agreement to the  contrary,  the indemnity  agreement  contained in this Section
9(b)  shall not apply to amounts  paid in  settlement  of any such loss,  claim,
damage,  liability or action if such settlement is effected  without the consent
of the Seller,  which  consent  shall not be  unreasonably  withheld or delayed;
provided further,  that the liability of each Seller in connection with any sale
of  Registrable  Securities  pursuant  to a  Registration  Statement  in which a
Violation  occurred shall be limited to the percentage of the total liability of
the  Sellers in  connection  with such sale that



                                      -11-



corresponds to such Seller's  percentage  ownership of the  outstanding  DynaGen
Common Stock. All obligations of the Sellers for indemnification are several and
not joint.

                  (c) Promptly after receipt by an indemnified  party under this
Section  9  of  notice  of  the  commencement  of  any  action   (including  any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made  against any  indemnifying  party under this Section 9, deliver to
the  indemnifying  party a written  notice of the  commencement  thereof and the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory to the parties; provided,  however, that an indemnified party shall
have the right to retain its own counsel,  with the fees and expenses to be paid
by the indemnifying  party, if  representation  of such indemnified party by the
counsel retained by the indemnifying  party would be inappropriate due to actual
or potential  differing or conflicting  interests between such indemnified party
and any other party represented by such counsel in such proceeding.  The failure
to deliver written notice to the indemnifying  party within a reasonable time of
the commencement of any such action, to the extent prejudicial to its ability to
defend such action,  shall relieve such  indemnifying  party of liability to the
indemnified party under this Section 9 to the extent of such prejudice,  but the
omission so to deliver written notice to the indemnifying party will not relieve
it of any liability  that it may have to any  indemnified  party  otherwise than
under this Section 9.

                  (d)  If  recovery  is  not   available   under  the  foregoing
indemnification  provisions  of this  Section  9, for any  reason  other than as
specified therein,  the parties entitled to indemnification by the terms thereof
shall be entitled to contribution to liabilities and expenses in such proportion
as is appropriate to reflect the relative fault of the indemnifying  parties and
the indemnified parties, except to the extent that contribution is not permitted
under  Section  11(f) of the 1933 Act. The relative  fault of such  indemnifying
party and  indemnified  party shall be  determined  by reference to, among other
things, the parties' relative knowledge and access to information concerning the
matter with respect to which the claim was asserted,  the opportunity to correct
and prevent any  statement  or omission and any other  equitable  considerations
appropriate under the circumstances,  including, without limitation, whether any
untrue  statement or alleged untrue  statement of a material fact or omission or
alleged omission to state a material fact relates to information supplied by the
Company,  on the one hand, or by the Holder of  Registrable  Securities,  on the
other hand.  The  Company and the  Shareholders  of the  Registrable  Securities
covered by such  Registration  Statement agree that it would not be equitable if
the  amount  of such  contribution  were  determined  by pro rata or per  capita
allocation.  No seller of Registrable  Securities  covered by such  Registration
Statement  or person  controlling  such Seller  shall be  obligated  to make any
contribution  hereunder  which in the aggregate  exceeds the net proceeds of the
securities sold by such seller,  less the aggregate  amount of any damages which
such seller and its  controlling  persons have otherwise been required to pay in
respect of the same claim or any substantially similar claim. The obligations of
such  Shareholders  to contribute are several in proportion to their  respective
ownership of the Registrable  Securities covered by such Registration  Statement
and not joint.

         10.  TRANSFERABILITY.   The  registration  rights  set  forth  in  this
Agreement are not transferable except to the persons permitted in Section 3, and
subject to the trading restrictions of Section 3. All transferees shall agree in
writing to be bound by all of the provisions of this



                                      -12-


Agreement.  The Company may issue stop  transfer  instructions  to its  transfer
agent to inform the  transfer  agent of the resale  restrictions  imposed by the
provisions of Section 3 hereof.

         11.   MISCELLANEOUS.

         11.1  AMENDMENTS  AND WAIVERS.  Any provision of this  Agreement may be
amended and the observance  thereof may only be waived (either generally or in a
particular instance and either retroactively or prospectively), with the written
consent  of the  Company  and  the  Holders  of a  majority  of the  Registrable
Securities then outstanding. Any amendment or waiver effected in accordance with
this Section 11.1 shall be binding upon each Holder of Registrable Securities at
the time  outstanding,  each future Holder of  Registrable  Securities,  and the
Company.

         11.2 NOTICES.  Any notice  required or permitted to be given  hereunder
shall be in writing and shall be deemed  given at the opening of business on the
first Business Day following the time (a) delivery is made, if by hand delivery,
(b) the  facsimile is  successfully  transmitted,  if by telecopier or facsimile
machine, or (c) the Business Day after such notice is deposited with a reputable
overnight courier service, postage prepaid, for next-day delivery,  addressed as
set forth  below on the  signature  page or to such  other  address as any party
shall have previously designated by such a notice.

         11.3 GOVERNING  LAW. This Agreement  shall for all purposes be governed
by and construed in  accordance  with the internal laws of the State of Delaware
with respect to the  enforceability  of  contracts  and in  accordance  with the
United States securities laws with respect to matters involving  securities laws
regarding the  registration  of the Registrable  Shares,  both without regard to
conflicts-of-laws  principles.  The  parties  hereto  agree  to  submit  to  the
jurisdiction  of the  federal  and state  courts of the State of  Delaware  with
respect to the breach or  interpretation of this Agreement or the enforcement of
any and all rights, duties, liabilities, obligations, powers and other relations
between parties arising under this Agreement.

         11.4 SEVERABILITY. If one or more provisions of this Agreement are held
to be  unenforceable  under applicable law, such provision shall be excised from
this  Agreement,  and the remainder of this Agreement shall be interpreted as if
such provision  were so excised and shall be enforceable in accordance  with its
remaining terms.

         11.5  COUNTERPARTS.  This  Agreement  may be  executed  in two or  more
counterparts,  each of which shall be deemed to be an original  and all of which
together shall constitute one and the same instrument.



                                      -13-


         IN WITNESS WHEREOF,  the parties have executed this Registration Rights
Agreement as of the date first written above.


                                  DYNAGEN, INC.

                                  By:    /s/ Dhananjay G. Wadekar
                                     ----------------------------------
                                  Title:  Executive Vice President
                                        -------------------------------



                                  SHAREHOLDERS:


                                  /s/ Dennis Smith
                                  ---------------------------------
                                  Dennis Smith

                                  /s/ Eric C. Hagerstrand
                                  ---------------------------------
                                  Eric C. Hagerstrand

                                  /s/ Thomas Canning
                                  ---------------------------------
                                  Thomas Canning



                                      -14-



                                   SCHEDULE A



HOLDERS OF REGISTRABLE SECURITIES                       REGISTRABLE SECURITIES
- ---------------------------------                       ----------------------

           DENNIS SMITH                                         716,667


       ERIC C. HAGERSTRAND                                      600,000


          THOMAS CANNING                                        350,000




                                                                     EXHIBIT 4.2


                             SECURED PROMISSORY NOTE


$1,800,000                                                         June 18, 1997


         For  value  received,  the  undersigned,   DynaGen,  Inc.,  a  Delaware
corporation ("Obligor"), hereby promises to pay to the order of Eric Hagerstrand
("Lender"), at his principal address at 11739 Grandstone Lane, Cincinnati,  Ohio
45249 or at such other place as may be  designated  from time to time in writing
by Lender,  the  principal sum of One Million  Eight  Hundred  Thousand  Dollars
($1,800,000)  together  with  interest in arrears  from and  including  the date
hereof on the unpaid principal  balance  hereunder,  at the rate of nine and one
half percent  (9.5%) per annum.  Interest  shall be  calculated  on the basis of
actual number of days elapsed over a year of 360 days. Notwithstanding any other
provision of this Note,  Lender does not intend to charge and Obligor  shall not
be  required  to pay any  interest  or other  fees or  charges  in excess of the
maximum  permitted  by  applicable  law;  any payments in excess of such maximum
shall be refunded to Obligor or credited to reduce principal hereunder.

         1. Payment of Principal and Interest;  Prepayment.  (a) Principal,  and
interest due thereon, shall be paid as follows:

            Date                                          Principal Amount Due
            ----                                          --------------------
            September 30, 1997                            $150,000.00
            December 31, 1997                             $150,000.00
            March 31, 1998                                $150,000.00
            June 30, 1998                                 $150,000.00
            September 30, 1998                            $150,000.00
            December 31, 1998                             $150,000.00
            March 31, 1999                                $150,000.00
            June 30, 1999                                 $150,000.00
            September 30, 1999                            $150,000.00
            December 31, 1999                             $150,000.00
            March 31, 2000                                $150,000.00
            June 30, 2000                                 $150,000.00

         (b) If any day on which a payment is due  pursuant to the terms of this
Note is not a day on  which  banks  in the  Commonwealth  of  Massachusetts  are
generally  open (a  "Business  Day"),  such  payment  shall  be due on the  next
Business  Day  following.  All  payments  received by Lender  hereunder  will be
applied first to costs of  collection,  if any, then to interest and the balance
to  principal.  Principal  and interest  shall be payable in lawful money of the
United States of America.



                                      -2-



         (c) This Note may be prepaid at any time,  without  premium or penalty,
in whole or in part,  all such  prepayments to be applied upon  installments  of
most remote  maturity.  Any  prepayment of principal  shall be  accompanied by a
payment of accrued interest in respect of the principal being prepaid.

         2. The Merger  Agreement;  Issuance of the Notes. This Note is one of a
limited number of Notes  (individually a "Note" and collectively the "Notes") in
the aggregate  principal amount of Five Million Dollars $5,000,000 issued by the
Obligor  to the  respective  Lenders  pursuant  to the  terms  of  that  certain
Agreement and Plan of Merger dated as of March 7, 1997, as amended, by and among
Obligor, Superior Pharmaceutical Company ("Superior"),  the Lender and the other
parties named therein (the "Merger  Agreement").  Capitalized  terms used herein
and not otherwise  defined shall have the meaning assigned to them in the Merger
Agreement.  The  Obligor  covenants  and  agrees  to  make  payments  (including
prepayments) on each Note pro-rata in accordance  with the respective  principal
amount of each such Note.

         3. Events of Default.  In the event that: (i) the Obligor fails to make
any payment of interest or principal within ten (10) business days following the
due  date  thereof;  (ii)  the  Obligor  makes  or  enters  into an  assignment,
reorganization  or similar  arrangement for the benefit of creditors;  (iii) the
Obligor  applies  for,  consents  to or  cooperates  with any  appointment  of a
receiver, trustee, liquidator,  custodian or similar official for it or any part
of the Obligor's  assets;  (iv) the Obligor  commences or seeks relief, or has a
petition  or other  action  commenced  against it or seeking  relief,  under any
bankruptcy, insolvency, reorganization, arrangement, dissolution, custodianship,
conservatorship,  liquidation or similar  proceeding,  and, if commenced against
it, is not discharged  within sixty (60) days; (v) there shall have occurred and
be continuing  beyond any  applicable  cure period any default by the Obligor of
any  covenant  or  agreement  of the  Obligor  under  this  Note  or the  Merger
Agreement;  (vi) all or substantially  all of the assets of the Obligor are sold
or the sale by the Obligor of eighty  percent  (80%) or more of the  outstanding
capital  stock of the Obligor (each of the preceding to be referred as an "Event
of  Default");   then  the  Lenders  holding  a  majority  in  principal  amount
outstanding under the Notes may, during the continuance of any of the foregoing,
accelerate the entire principal balance outstanding  hereunder by written notice
to the  Obligor  in which  event the  unpaid  balance of this Note and the Notes
shall become immediately due and payable without notice or demand.

         4.  Covenants of Obligor.  Obligor shall cause  Superior to comply with
all covenants  contained in that certain  Amended and Restated Loan and Security
Agreement  dated as of June 18, 1997 between The  Huntington  National  Bank and
Superior, which covenants are incorporated herein by reference and shall survive
the termination of such Amended and Restated Loan and Security Agreement.

         5. Rights  under Merger  Agreement.  This Note is subject to the rights
and  obligations  under the Merger  Agreement and the exercise by Obligor of any
right of indemnification pursuant to Article X of the Merger Agreement shall not
be deemed an Event of Default under Section 3 of this Note;  provided,  however,
that  such  right of  indemnification  shall  not be  exercised  until the final
resolution  or  settlement  of any claim  pursuant to Section 10.6 of the Merger
Agreement.

         6.  Pledge  Agreement.  This Note is  secured  by and  entitled  to the
benefits of that certain  Pledge  Agreement  of even date  herewith by and among
Obligor, Lender and the other parties named therein (the "Pledge Agreement").

         7. Costs of Collection. If this Note is not paid in accordance with its
terms,  Obligor  shall pay to Lender,  in  addition  to  principal  and  accrued
interest thereon, all costs of collection of the principal and


                                      -3-


accrued interest,  including,  but not limited to,  reasonable  attorneys' fees,
court costs and other costs for the  successful  enforcement  of payment of this
Note.

         8. Notices.  All notices,  requests,  consents and other communications
hereunder  shall be in writing,  shall be  addressed  to the  receiving  party's
address set forth  below or to such other  address as a party may  designate  by
notice  hereunder,  and  shall be either  (i)  delivered  by hand,  (ii) made by
telecopy or facsimile  transmission,  (iii) sent by overnight  courier,  or (iv)
sent by registered mail, return receipt requested, postage prepaid. All notices,
requests,  consents and other  communications  hereunder shall be deemed to have
been given  either (i) if by hand,  at the time of the  delivery  thereof to the
receiving  party at the address of such party set forth  above,  (ii) if made by
telecopy or facsimile  transmission,  at the time that receipt  thereof has been
acknowledged by electronic confirmation or otherwise, (iii) if sent by overnight
courier,  on the next business day following the day such notice is delivered to
the courier  service,  or (iv) if sent by registered mail, on the fifth business
day following the date such mailing is made.

         9. Governing  Law. This Note shall be deemed  delivered in and shall be
enforceable in accordance  with the internal laws of the State of Ohio,  without
reference  to its  conflicts  of law  provisions,  and  shall  be  construed  in
accordance therewith, and shall have the effect of a sealed instrument.

         10. Waiver of Presentment and Demand.  Obligor hereby  expressly waives
presentment,  demand, and protest,  notice of demand, dishonor and nonpayment of
this Note,  and all other notices or demands of any kind in connection  with the
delivery,  acceptance,  performance,  default or enforcement  hereof, and hereby
consents to any delays,  extensions of time, renewals,  waivers or modifications
that may be granted or  consented  to by the holder  hereof with  respect to the
time of payment or any other provision hereof.

         11.  Severability.  In the event any one or more of the  provisions  of
this Note shall for any reason be held to be invalid,  illegal or unenforceable,
in whole or in part or in any  respect,  or in the event that any one or more of
the provisions of this Note operate or would prospectively operate to invalidate
this Note, then and in any such event,  such  provision(s)  only shall be deemed
null and void and shall not  affect  any  other  provision  of this Note and the
remaining  provisions of this Note shall remain  operative and in full force and
effect and in no way shall be affected, prejudiced, or disturbed thereby.


         12. Waiver;  Amendment. None of the terms or provision of this Note may
be waived,  amended,  supplemented  or  otherwise  modified  except by a written
instrument executed by Obligor and the holders of a majority in principal amount
outstanding under the Notes. A waiver by such noteholders of any right or remedy
under this Note on any occasion shall not be a bar to exercise of the same right
or  remedy on any  subsequent  occasion  or of any other  right or remedy at any
time.


                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]



                                      -4-



                                              OBLIGOR:

[Corporate Seal]                              DynaGen, Inc.



                                              By: /s/ Dhananjay G. Wadekar
                                                  ---------------------------
                                                  Dhananjay G. Wadekar


Attested:

By: /s/ Kenneth J. Gordon
   -------------------------
Name: Kenneth J. Gordon
     -----------------------
Title: Asst. Secretary
      ----------------------


                                                                     EXHIBIT 4.3



                             SECURED PROMISSORY NOTE


$2,150,000                                                         June 18, 1997


         For  value  received,  the  undersigned,   DynaGen,  Inc.,  a  Delaware
corporation ("Obligor"),  hereby promises to pay to the order of Dennis B. Smith
("Lender"), at his principal address at 6434 Hamilton-Mason Road, Hamilton, Ohio
45011 or at such other place as may be  designated  from time to time in writing
by Lender,  the principal sum of Two Million One Hundred Fifty Thousand  Dollars
($2,150,000)  together  with  interest in arrears  from and  including  the date
hereof on the unpaid principal  balance  hereunder,  at the rate of nine and one
half percent  (9.5%) per annum.  Interest  shall be  calculated  on the basis of
actual number of days elapsed over a year of 360 days. Notwithstanding any other
provision of this Note,  Lender does not intend to charge and Obligor  shall not
be  required  to pay any  interest  or other  fees or  charges  in excess of the
maximum  permitted  by  applicable  law;  any payments in excess of such maximum
shall be refunded to Obligor or credited to reduce principal hereunder.

         1. Payment of Principal and Interest;  Prepayment.  (a) Principal,  and
interest due thereon, shall be paid as follows:

         Date                                          Principal Amount Due
         ----                                          --------------------
         September 30, 1997                            $179,166.67
         December 31, 1997                             $179,166.67
         March 31, 1998                                $179,166.67
         June 30, 1998                                 $179,166.67
         September 30, 1998                            $179,166.67
         December 31, 1998                             $179,166.67
         March 31, 1999                                $179,166.67
         June 30, 1999                                 $179,166.67
         September 30, 1999                            $179,166.67
         December 31, 1999                             $179,166.67
         March 31, 2000                                $179,166.67
         June 30, 2000                                 $179,166.67

         (b) If any day on which a payment is due  pursuant to the terms of this
Note is not a day on  which  banks  in the  Commonwealth  of  Massachusetts  are
generally  open (a  "Business  Day"),  such  payment  shall  be due on the  next
Business  Day  following.  All  payments  received by Lender  hereunder  will be
applied first to costs of  collection,  if any, then to interest and the balance
to  principal.  Principal  and interest  shall be payable in lawful money of the
United States of America.


                                      -2-


         (c) This Note may be prepaid at any time,  without  premium or penalty,
in whole or in part,  all such  prepayments to be applied upon  installments  of
most remote  maturity.  Any  prepayment of principal  shall be  accompanied by a
payment of accrued interest in respect of the principal being prepaid.

         2. The Merger  Agreement;  Issuance of the Notes. This Note is one of a
limited number of Notes  (individually a "Note" and collectively the "Notes") in
the aggregate  principal amount of Five Million Dollars $5,000,000 issued by the
Obligor  to the  respective  Lenders  pursuant  to the  terms  of  that  certain
Agreement and Plan of Merger dated as of March 7, 1997, as amended, by and among
Obligor, Superior Pharmaceutical Company ("Superior"),  the Lender and the other
parties named therein (the "Merger  Agreement").  Capitalized  terms used herein
and not otherwise  defined shall have the meaning assigned to them in the Merger
Agreement.  The  Obligor  covenants  and  agrees  to  make  payments  (including
prepayments) on each Note pro-rata in accordance  with the respective  principal
amount of each such Note.

         3. Events of Default.  In the event that: (i) the Obligor fails to make
any payment of interest or principal within ten (10) business days following the
due  date  thereof;  (ii)  the  Obligor  makes  or  enters  into an  assignment,
reorganization  or similar  arrangement for the benefit of creditors;  (iii) the
Obligor  applies  for,  consents  to or  cooperates  with any  appointment  of a
receiver, trustee, liquidator,  custodian or similar official for it or any part
of the Obligor's  assets;  (iv) the Obligor  commences or seeks relief, or has a
petition  or other  action  commenced  against it or seeking  relief,  under any
bankruptcy, insolvency, reorganization, arrangement, dissolution, custodianship,
conservatorship,  liquidation or similar  proceeding,  and, if commenced against
it, is not discharged  within sixty (60) days; (v) there shall have occurred and
be continuing  beyond any  applicable  cure period any default by the Obligor of
any  covenant  or  agreement  of the  Obligor  under  this  Note  or the  Merger
Agreement;  (vi) all or substantially  all of the assets of the Obligor are sold
or the sale by the Obligor of eighty  percent  (80%) or more of the  outstanding
capital  stock of the Obligor (each of the preceding to be referred as an "Event
of  Default");   then  the  Lenders  holding  a  majority  in  principal  amount
outstanding under the Notes may, during the continuance of any of the foregoing,
accelerate the entire principal balance outstanding  hereunder by written notice
to the  Obligor  in which  event the  unpaid  balance of this Note and the Notes
shall become immediately due and payable without notice or demand.

         4.  Covenants of Obligor.  Obligor shall cause  Superior to comply with
all covenants  contained in that certain  Amended and Restated Loan and Security
Agreement  dated as of June 18, 1997 between The  Huntington  National  Bank and
Superior, which covenants are incorporated herein by reference and shall survive
the termination of such Amended and Restated Loan and Security Agreement.

         5. Rights  under Merger  Agreement.  This Note is subject to the rights
and  obligations  under the Merger  Agreement and the exercise by Obligor of any
right of indemnification pursuant to Article X of the Merger Agreement shall not
be deemed an Event of Default under Section 3 of this Note;  provided,  however,
that  such  right of  indemnification  shall  not be  exercised  until the final
resolution  or  settlement  of any claim  pursuant to Section 10.6 of the Merger
Agreement.

         6.  Pledge  Agreement.  This Note is  secured  by and  entitled  to the
benefits of that certain  Pledge  Agreement  of even date  herewith by and among
Obligor, Lender and the other parties named therein (the "Pledge Agreement").

         7. Costs of Collection. If this Note is not paid in accordance with its
terms,  Obligor  shall pay to Lender,  in  addition  to  principal  and  accrued
interest thereon, all costs of collection of the principal and



                                      -3-


accrued interest,  including,  but not limited to,  reasonable  attorneys' fees,
court costs and other costs for the  successful  enforcement  of payment of this
Note.

         8. Notices.  All notices,  requests,  consents and other communications
hereunder  shall be in writing,  shall be  addressed  to the  receiving  party's
address set forth  below or to such other  address as a party may  designate  by
notice  hereunder,  and  shall be either  (i)  delivered  by hand,  (ii) made by
telecopy or facsimile  transmission,  (iii) sent by overnight  courier,  or (iv)
sent by registered mail, return receipt requested, postage prepaid. All notices,
requests,  consents and other  communications  hereunder shall be deemed to have
been given  either (i) if by hand,  at the time of the  delivery  thereof to the
receiving  party at the address of such party set forth  above,  (ii) if made by
telecopy or facsimile  transmission,  at the time that receipt  thereof has been
acknowledged by electronic confirmation or otherwise, (iii) if sent by overnight
courier,  on the next business day following the day such notice is delivered to
the courier  service,  or (iv) if sent by registered mail, on the fifth business
day following the date such mailing is made.

         9. Governing  Law. This Note shall be deemed  delivered in and shall be
enforceable in accordance  with the internal laws of the State of Ohio,  without
reference  to its  conflicts  of law  provisions,  and  shall  be  construed  in
accordance therewith, and shall have the effect of a sealed instrument.

         10. Waiver of Presentment and Demand.  Obligor hereby  expressly waives
presentment,  demand, and protest,  notice of demand, dishonor and nonpayment of
this Note,  and all other notices or demands of any kind in connection  with the
delivery,  acceptance,  performance,  default or enforcement  hereof, and hereby
consents to any delays,  extensions of time, renewals,  waivers or modifications
that may be granted or  consented  to by the holder  hereof with  respect to the
time of payment or any other provision hereof.

         11.  Severability.  In the event any one or more of the  provisions  of
this Note shall for any reason be held to be invalid,  illegal or unenforceable,
in whole or in part or in any  respect,  or in the event that any one or more of
the provisions of this Note operate or would prospectively operate to invalidate
this Note, then and in any such event,  such  provision(s)  only shall be deemed
null and void and shall not  affect  any  other  provision  of this Note and the
remaining  provisions of this Note shall remain  operative and in full force and
effect and in no way shall be affected, prejudiced, or disturbed thereby.


         12. Waiver;  Amendment. None of the terms or provision of this Note may
be waived,  amended,  supplemented  or  otherwise  modified  except by a written
instrument executed by Obligor and the holders of a majority in principal amount
outstanding under the Notes. A waiver by such noteholders of any right or remedy
under this Note on any occasion shall not be a bar to exercise of the same right
or  remedy on any  subsequent  occasion  or of any other  right or remedy at any
time.


                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]



                                      -4-



                                         OBLIGOR:

[Corporate Seal]                         DynaGen, Inc.


                                         By: /s/ Dhananjay G. Wadekar
                                             -------------------------------
                                             Dhananjay G. Wadekar

Attested:

By: /s/ Kenneth J. Gordon
    ------------------------
Name: Kenneth J. Gordon
     -----------------------
Title: Asst. Secretary
      ----------------------


                                                                     EXHIBIT 4.4



                             SECURED PROMISSORY NOTE


$1,050,000                                                         June 18, 1997


         For  value  received,  the  undersigned,   DynaGen,  Inc.,  a  Delaware
corporation  ("Obligor"),  hereby  promises  to pay to the  order of  Thomas  L.
Canning ("Lender"),  at his principal address at Bicentennial Place, Cincinnati,
Ohio  45249 or at such  other  place as may be  designated  from time to time in
writing by Lender,  the  principal  sum of One Million  Fifty  Thousand  Dollars
($1,050,000)  together  with  interest in arrears  from and  including  the date
hereof on the unpaid principal  balance  hereunder,  at the rate of nine and one
half percent  (9.5%) per annum.  Interest  shall be  calculated  on the basis of
actual number of days elapsed over a year of 360 days. Notwithstanding any other
provision of this Note,  Lender does not intend to charge and Obligor  shall not
be  required  to pay any  interest  or other  fees or  charges  in excess of the
maximum  permitted  by  applicable  law;  any payments in excess of such maximum
shall be refunded to Obligor or credited to reduce principal hereunder.

         1. Payment of Principal and Interest;  Prepayment.  (a) Principal,  and
interest due thereon, shall be paid as follows:

         Date                                          Principal Amount Due
         ----                                          --------------------
         September 30, 1997                            $87,500.00
         December 31, 1997                             $87,500.00
         March 31, 1998                                $87,500.00
         June 30, 1998                                 $87,500.00
         September 30, 1998                            $87,500.00
         December 31, 1998                             $87,500.00
         March 31, 1999                                $87,500.00
         June 30, 1999                                 $87,500.00
         September 30, 1999                            $87,500.00
         December 31, 1999                             $87,500.00
         March 31, 2000                                $87,500.00
         June 30, 2000                                 $87,500.00

         (b) If any day on which a payment is due  pursuant to the terms of this
Note is not a day on  which  banks  in the  Commonwealth  of  Massachusetts  are
generally  open (a  "Business  Day"),  such  payment  shall  be due on the  next
Business  Day  following.  All  payments  received by Lender  hereunder  will be
applied first to costs of  collection,  if any, then to interest and the balance
to  principal.  Principal  and interest  shall be payable in lawful money of the
United States of America.



                                      -2-


         (c) This Note may be prepaid at any time,  without  premium or penalty,
in whole or in part,  all such  prepayments to be applied upon  installments  of
most remote  maturity.  Any  prepayment of principal  shall be  accompanied by a
payment of accrued interest in respect of the principal being prepaid.

         2. The Merger  Agreement;  Issuance of the Notes. This Note is one of a
limited number of Notes  (individually a "Note" and collectively the "Notes") in
the aggregate  principal amount of Five Million Dollars $5,000,000 issued by the
Obligor  to the  respective  Lenders  pursuant  to the  terms  of  that  certain
Agreement and Plan of Merger dated as of March 7, 1997, as amended, by and among
Obligor, Superior Pharmaceutical Company ("Superior"),  the Lender and the other
parties named therein (the "Merger  Agreement").  Capitalized  terms used herein
and not otherwise  defined shall have the meaning assigned to them in the Merger
Agreement.  The  Obligor  covenants  and  agrees  to  make  payments  (including
prepayments) on each Note pro-rata in accordance  with the respective  principal
amount of each such Note.

         3. Events of Default.  In the event that: (i) the Obligor fails to make
any payment of interest or principal within ten (10) business days following the
due  date  thereof;  (ii)  the  Obligor  makes  or  enters  into an  assignment,
reorganization  or similar  arrangement for the benefit of creditors;  (iii) the
Obligor  applies  for,  consents  to or  cooperates  with any  appointment  of a
receiver, trustee, liquidator,  custodian or similar official for it or any part
of the Obligor's  assets;  (iv) the Obligor  commences or seeks relief, or has a
petition  or other  action  commenced  against it or seeking  relief,  under any
bankruptcy, insolvency, reorganization, arrangement, dissolution, custodianship,
conservatorship,  liquidation or similar  proceeding,  and, if commenced against
it, is not discharged  within sixty (60) days; (v) there shall have occurred and
be continuing  beyond any  applicable  cure period any default by the Obligor of
any  covenant  or  agreement  of the  Obligor  under  this  Note  or the  Merger
Agreement;  (vi) all or substantially  all of the assets of the Obligor are sold
or the sale by the Obligor of eighty  percent  (80%) or more of the  outstanding
capital  stock of the Obligor (each of the preceding to be referred as an "Event
of  Default");   then  the  Lenders  holding  a  majority  in  principal  amount
outstanding under the Notes may, during the continuance of any of the foregoing,
accelerate the entire principal balance outstanding  hereunder by written notice
to the  Obligor  in which  event the  unpaid  balance of this Note and the Notes
shall become immediately due and payable without notice or demand.

         4.  Covenants of Obligor.  Obligor shall cause  Superior to comply with
all covenants  contained in that certain  Amended and Restated Loan and Security
Agreement  dated as of June 18, 1997 between The  Huntington  National  Bank and
Superior, which covenants are incorporated herein by reference and shall survive
the termination of such Amended and Restated Loan and Security Agreement.

         5. Rights  under Merger  Agreement.  This Note is subject to the rights
and  obligations  under the Merger  Agreement and the exercise by Obligor of any
right of indemnification pursuant to Article X of the Merger Agreement shall not
be deemed an Event of Default under Section 3 of this Note;  provided,  however,
that  such  right of  indemnification  shall  not be  exercised  until the final
resolution  or  settlement  of any claim  pursuant to Section 10.6 of the Merger
Agreement.

         6.  Pledge  Agreement.  This Note is  secured  by and  entitled  to the
benefits of that certain  Pledge  Agreement  of even date  herewith by and among
Obligor, Lender and the other parties named therein (the "Pledge Agreement").

         7. Costs of Collection. If this Note is not paid in accordance with its
terms,  Obligor  shall pay to Lender,  in  addition  to  principal  and  accrued
interest thereon, all costs of collection of the principal and



                                      -3-



accrued interest,  including,  but not limited to,  reasonable  attorneys' fees,
court costs and other costs for the  successful  enforcement  of payment of this
Note.

         8. Notices.  All notices,  requests,  consents and other communications
hereunder  shall be in writing,  shall be  addressed  to the  receiving  party's
address set forth  below or to such other  address as a party may  designate  by
notice  hereunder,  and  shall be either  (i)  delivered  by hand,  (ii) made by
telecopy or facsimile  transmission,  (iii) sent by overnight  courier,  or (iv)
sent by registered mail, return receipt requested, postage prepaid. All notices,
requests,  consents and other  communications  hereunder shall be deemed to have
been given  either (i) if by hand,  at the time of the  delivery  thereof to the
receiving  party at the address of such party set forth  above,  (ii) if made by
telecopy or facsimile  transmission,  at the time that receipt  thereof has been
acknowledged by electronic confirmation or otherwise, (iii) if sent by overnight
courier,  on the next business day following the day such notice is delivered to
the courier  service,  or (iv) if sent by registered mail, on the fifth business
day following the date such mailing is made.

         9. Governing  Law. This Note shall be deemed  delivered in and shall be
enforceable in accordance  with the internal laws of the State of Ohio,  without
reference  to its  conflicts  of law  provisions,  and  shall  be  construed  in
accordance therewith, and shall have the effect of a sealed instrument.

         10. Waiver of Presentment and Demand.  Obligor hereby  expressly waives
presentment,  demand, and protest,  notice of demand, dishonor and nonpayment of
this Note,  and all other notices or demands of any kind in connection  with the
delivery,  acceptance,  performance,  default or enforcement  hereof, and hereby
consents to any delays,  extensions of time, renewals,  waivers or modifications
that may be granted or  consented  to by the holder  hereof with  respect to the
time of payment or any other provision hereof.

         11.  Severability.  In the event any one or more of the  provisions  of
this Note shall for any reason be held to be invalid,  illegal or unenforceable,
in whole or in part or in any  respect,  or in the event that any one or more of
the provisions of this Note operate or would prospectively operate to invalidate
this Note, then and in any such event,  such  provision(s)  only shall be deemed
null and void and shall not  affect  any  other  provision  of this Note and the
remaining  provisions of this Note shall remain  operative and in full force and
effect and in no way shall be affected, prejudiced, or disturbed thereby.


         12. Waiver;  Amendment. None of the terms or provision of this Note may
be waived,  amended,  supplemented  or  otherwise  modified  except by a written
instrument executed by Obligor and the holders of a majority in principal amount
outstanding under the Notes. A waiver by such noteholders of any right or remedy
under this Note on any occasion shall not be a bar to exercise of the same right
or  remedy on any  subsequent  occasion  or of any other  right or remedy at any
time.


                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]



                                      -4-


                                         OBLIGOR:

[Corporate Seal]                         DynaGen, Inc.


                                         By: /s/ Dhananjay G. Wadekar
                                             ---------------------------
                                             Dhananjay G. Wadekar


Attested:

By: /s/ Kenneth J. Gordon
   -------------------------
Name: Kenneth J. Gordon
     -----------------------
Title: Asst. Secretary
      ----------------------



                                                                     EXHIBIT 4.5


                                PLEDGE AGREEMENT


         PLEDGE  AGREEMENT,  dated as of June 18, 1997,  made by the undersigned
DynaGen,  Inc.,  a Delaware  corporation  with its  principal  office at 99 Erie
Street,  Cambridge,  Massachusetts  02139 (the "Borrower"),  in favor of Eric C.
Hagerstrand   ("Hagerstrand"),   Dennis  Smith   ("Smith")  and  Thomas  Canning
("Canning") (individually a "Lender" and collectively the "Lenders").

                                    RECITALS

         WHEREAS,  pursuant to the terms of that certain  Agreement  and Plan of
Merger  by  and  among  the  Borrower,   DynaGen  Acquisition  Corp.,   Superior
Pharmaceutical  Company  ("Superior")  and the Lenders  dated March 7, 1997,  as
amended (the  "Merger  Agreement"),  the  Borrower  has agreed to issue  secured
promissory notes in the aggregate principal amount of $5,000,000 (individually a
"Note" and collectively the "Notes") to the Lenders, such notes to be secured by
a pledge of the Pledged Securities (as hereinafter defined) ;

         WHEREAS,  the Borrower is the legal and beneficial owner of the Pledged
Securities.

         NOW, THEREFORE,  in consideration of the premises,  the Borrower hereby
agrees with the Lenders as follows:

         1. Defined  Terms.  Unless  otherwise  defined  herein,  terms that are
defined  in the  Notes  and  used  herein  are so  used as so  defined,  and the
following terms shall have the following meanings:

         "Code" means the Uniform Commercial Code from time to time in effect in
the Commonwealth of Massachusetts.

         "Collateral" means the Pledged Securities and all Proceeds.

         "Event of Default" means an Event of Default as defined in Section 3 of
the Notes.

         "Obligations"  means the unpaid  principal of and interest on the Notes
and all other  obligations  and  liabilities  of the  Borrower  to the  Lenders,
whether direct or indirect, absolute or contingent, due or to become due, or now
existing or hereafter incurred,  which may arise under, out of, or in connection
with the Notes or this Pledge  Agreement and any other document made,  delivered
or given in connection  therewith or herewith,  whether on account of principal,
interest,   reimbursement  obligations,   fees,  indemnities,   costs,  expenses
(including, without limitation, all reasonable fees and disbursements of counsel
to the Lenders) or otherwise.

         "Pledge   Agreement"   means  this   Pledge   Agreement,   as  amended,
supplemented or otherwise modified from time to time.

         "Pledged  Securities"  means  the  shares  of  capital  stock and other
securities  listed on Schedule I hereto,  together with all stock  certificates,
instruments,  options or rights of any nature  whatsoever  that may be issued or
granted to the Borrower in respect of the Pledged Securities,  while this Pledge
Agreement is in effect.



                           Pledge Agreement -- Page 2



         "Proceeds"  means all  "proceeds"  as such term is  defined  in Section
9-306(1) of the Code and, in any event, shall include,  without limitation,  all
dividends or other income from the Pledged  Securities,  collections  thereon or
distributions with respect thereto.

         2. Pledge; Grant of Security Interest.  The Borrower hereby delivers to
the Lenders all the Pledged  Securities and hereby grants to the Lenders a first
security interest in the Collateral,  as collateral  security for the prompt and
complete payment and performance  when due (whether at the stated  maturity,  by
acceleration or otherwise) of the Obligations.  The Lenders shall deposit 72, 86
and  42  of  the  Pledged  Securities  with  Hagerstrand,   Smith  and  Canning,
respectively,  c/o Superior  Pharmaceutical  Company,  1385 Kemper Meadow Drive,
Cincinnati,  OH 45240. The Borrower and Lenders acknowledge that the Lenders are
also  holding  the  collateral  for the  benefit of Sirrom  Capital  Corporation
("Sirrom") and Odyssey Investment Partners,  L.P. ("Odyssey") in accordance with
that certain  Subordination  Agreement of even date herewith by and among Sirrom
(as collateral agent), the Lenders, the Borrower and Superior.

         3. Stock Powers.  Concurrently with the delivery to the Lenders of each
certificate  or instrument  representing  the Pledged  Securities,  the Borrower
shall deliver an undated stock power or other  transfer  document  covering such
certificate or instrument, duly executed in blank.

         4. Representations and Warranties. The Borrower represents and warrants
to the Lenders that:

                  (a) the  Borrower is the record and  beneficial  owner of, and
has good and marketable title to, the Pledged  Securities  listed on Schedule I,
free of any and all security interests,  liens or options in favor of, or claims
of, any other person or entity; and

                  (b) upon  delivery  to the  Lenders  of the  certificates  and
instruments evidencing the Pledged Securities, the lien granted pursuant to this
Pledge  Agreement will constitute a valid,  perfected first priority lien on the
Pledged Securities enforceable as such against all creditors of the Borrower and
any person or entities purporting to purchase any Collateral from the Borrower.

         5. Covenants.  The Borrower covenants and agrees with the Lenders that,
from and after the date of this Pledge  Agreement until the Obligations are paid
in full:

                  (a) If the Borrower shall, as a result of its ownership of the
Pledged  Securities,  become  entitled  to  receive or shall  receive  any stock
certificate or other certificate or instrument  (including,  without limitation,
any  certificate  representing a stock dividend or a distribution  in connection
with any  reclassification,  increase or reduction of capital or any certificate
or instrument issued in connection with any  reorganization),  option or rights,
whether in addition to, in  substitution  of, as a conversion of, or in exchange
for any of the Pledged Securities or otherwise in respect thereof,  the Borrower
shall  accept  the same as the  Lenders'  agent,  hold the same in trust for the
Lenders  and  deliver  the same  forthwith  to the  Lenders  in the  exact  form
received,  together  with an  undated  stock  power or other  transfer  document
covering such certificate or instrument duly executed in blank to be held by the
Lenders  hereunder as additional  collateral  security for the Obligations.  Any
sums paid upon or in respect of the Pledged  Securities  upon the liquidation or
dissolution  of the  issuer  thereof  shall  be  paid  over  to the  Lenders  as
additional  collateral  security hereunder for the Obligations,  and in case any
distribution of capital shall be made on or in respect of the Pledged Securities
or any  property  shall  be  distributed  upon or with  respect  to the  Pledged
Securities  pursuant to the  recapitalization or reclassification of the capital
of the issuer thereof or pursuant to the reorganization thereof, the property so
distributed  shall be delivered to the Lenders,  subject to the terms hereof, as
additional collateral security for the Obligations. If any sums of money or



                           Pledge Agreement -- Page 3


property so paid or  distributed in respect of the Pledged  Securities  shall be
received by the Borrower,  the Borrower  shall,  until such money or property is
paid or delivered  to the Lenders,  hold such money or property in trust for the
Lenders,  segregated from other funds of the Borrower,  as additional collateral
security for the Obligations.

                  (b) Without the prior written consent of the Lenders holding a
majority of the outstanding principal amount under the Notes, the Borrower shall
not (i) sell, assign,  transfer,  exchange or otherwise dispose of, or grant any
option with respect to, the Collateral, or (ii) create, incur or permit to exist
any lien or  option in favor  of,  or any  claim of any  person  or entity  with
respect to, any of the Collateral,  or any interest  therein.  The Borrower will
defend the right,  title and  interest of the  Lenders in and to the  Collateral
against  the claims  and  demands  of all  persons  and  entities.  The  Lenders
acknowledge and agree that the Borrower has granted a second  security  interest
to Sirrom and Odyssey pursuant to the Pledge and Security Agreement of even date
herewith by and among Sirrom (as collateral  agent for itself and Odyssey),  the
Borrower and Superior.

                  (c) At any  time  and from  time to  time,  upon  the  written
request of the Lenders  holding a majority of the outstanding  principal  amount
under the Notes,  and at the sole expense of the  Borrower,  the Borrower  shall
promptly and duly execute and deliver such further instruments and documents and
take such  further  actions  as such  Lenders  may  reasonably  request  for the
purposes of obtaining or preserving  the full benefits of this Pledge  Agreement
and of the rights and powers herein  granted.  If any amount payable under or in
connection  with any of the  Collateral  shall  be or  become  evidenced  by any
promissory  note, other  instrument or chattel paper,  such note,  instrument or
chattel  paper shall be promptly  delivered to the Lenders,  duly  endorsed in a
manner  satisfactory to the Lenders holding a majority of principal amount under
the Notes, to be held as Collateral pursuant to this Pledge Agreement.

                  (d) The  Borrower  agrees  to pay,  and to  save  the  Lenders
harmless  from, any and all  liabilities  with respect to, or resulting from any
delay in paying any and all stamp,  excise,  sales or other taxes  (exclusive of
taxes based on income, gross receipts,  franchise rights and related items) that
may be payable or determined to be payable with respect to any of the Collateral
or in  connection  with  any of the  transactions  contemplated  by this  Pledge
Agreement.

         6. Cash  Dividends;  Voting Rights.  Notwithstanding  the provisions of
Section  5(a)  hereof,  unless an Event of  Default  shall  have  occurred,  the
Borrower  shall be  permitted  to  receive  all cash  dividends  and other  cash
distributions  paid by the issuer of any of the Pledged Securities in respect of
the Pledged  Securities  and to exercise  all voting and  corporate  rights with
respect to the Pledged Securities.

         7.  Rights of the  Lenders.  (a) If an Event of  Default  occurs and is
continuing:  (i) each Lender  shall have the right to receive his pro rata share
of any and all cash dividends paid in respect of the Pledged Securities and make
application  thereof to the  Obligations in such order as he may determine,  and
(ii) each Lender's pro rata share of the Pledged  Securities shall be registered
in the name of such  Lender or his  nominee,  and each Lender or his nominee may
thereafter  exercise (A) all voting,  corporate,  and other rights pertaining to
such Pledged  Securities  at any meeting or otherwise and (B) any and all rights
of  conversion,  exchange,  subscription  and any other  rights,  privileges  or
options  pertaining to such Pledged  Securities as if he were the absolute owner
thereof (including,  without limitation, the right to exchange at his discretion
any  and  all  of  such  Pledged  Securities  upon  the  merger,  consolidation,
reorganization, recapitalization or other fundamental change in the corporate or
partnership structure of the issuer thereof or upon the exercise by the Borrower
or such Lender of any right,  privilege  or option  pertaining  to such  Pledged
Securities and in connection therewith, the right to deposit and deliver any and
all of such Pledged Securities with any committee,  depository,  transfer agent,
registrar or other  designated  agency upon such terms and  conditions



                           Pledge Agreement -- Page 4


as he may  determine),  all without  liability  except to account  for  property
actually  received by him,  but the Lenders  shall have no duty to exercise  any
such right,  privilege or option and shall not be responsible for any failure to
do so or delay in so doing.

                  (b)  The  rights  of  the  Lenders   hereunder  shall  not  be
conditioned or contingent  upon the pursuit by the Lenders or any of them of any
right or remedy  against the Borrower or against any other person or entity that
may be or become  liable in  respect  of all or any part of the  Obligations  or
against any other collateral  security  therefor,  guarantee thereof or right of
offset with respect thereto.  The Lenders shall not be liable for any failure to
demand,  collect or realize  upon all or any part of the  Collateral  or for any
delay in doing so, nor shall they or any of them be under any obligation to sell
or otherwise  dispose of any Collateral  upon the request of the Borrower or any
other person or entity or to take any other action whatsoever with regard to the
Collateral or any part thereof.

                  (c) It is  expressly  acknowledged  and agreed by the  parties
hereto that the exercise of Buyer's rights  contained in Article X of the Merger
Agreement is not an Event of Default under the Notes;  provided,  however,  that
any right of  indemnification  shall not be exercised until the final resolution
or settlement of any claim pursuant to Section 10.6 of the Merger Agreement.

         8.  Remedies.  If an Event of Default  occurs and is  continuing,  each
Lender may  exercise,  in addition to all other rights and  remedies  granted in
this  Pledge  Agreement  and in any  other  instrument  or  agreement  securing,
evidencing or relating to the Obligations,  all rights and remedies of a secured
party under the Code.  Without  limiting the generality of the  foregoing,  each
Lender,  without demand of performance  or other demand,  presentment,  protest,
advertisement  or notice of any kind (except any notice required by law referred
to below) to or upon the  Borrower,  any guarantor or any other person or entity
(all and each of which demands, defenses,  advertisements and notices are hereby
expressly  waived),  may  in  such  circumstances  forthwith  collect,  receive,
appropriate and realize upon his pro rata share of the  Collateral,  or any part
thereof,  and/or may forthwith sell, assign,  give option or options to purchase
or otherwise  dispose of and deliver his pro rata share of the Collateral or any
part thereof (or contract to do any of the foregoing), in one or more parcels at
public  or  private  sale  or  sales,  in the  over-the-counter  market,  at any
exchange,  broker's  board or office of such Lender or elsewhere upon such terms
and  conditions as he may deem advisable and at such prices as he may deem best,
for cash or on credit or for future  delivery  without  assumption of any credit
risk. The Lenders shall have the right upon any such public sale or sales,  and,
to the extent permitted by law, upon any such private sale or sales, to purchase
the whole or any part of the Collateral so sold,  free of any right or equity of
redemption in the Borrower, which right or equity is hereby expressly waived and
released. Each Lender shall apply any Proceeds from time to time held by him and
the net  proceeds  of any such  collection,  recovery,  receipt,  appropriation,
realization or sale,  after deducting all reasonable costs and expenses of every
kind incurred  therein or incidental  to the care or  safekeeping  of any of the
Collateral or in any way relating to the Collateral or the rights of the Lenders
hereunder,  including,  without  limitation,   reasonable  attorneys'  fees  and
disbursements,  to the payment in whole or in part of the  Obligations,  in such
order as each Lender may elect,  and only after such  application  and after the
payment by such Lender of any other  amount  required by any  provision  of law,
including, without limitation, Section 9-504(1)(c) of the Code, need such Lender
account for the surplus,  if any, to the  Borrower.  To the extent  permitted by
applicable  law,  the  Borrower  waives all  claims,  damages and demands it may
acquire against the Lenders arising out of the exercise by the Lenders of any of
their rights hereunder. If any notice of a proposed sale or other disposition of
Collateral shall be required by law, such notice shall be deemed  reasonable and
proper if given at least ten (10) days before such sale or other disposition.



                           Pledge Agreement -- Page 5



         9. Limitation on Duties  Regarding  Collateral.  The Lenders' sole duty
with  respect to the  custody,  safekeeping  and  physical  preservation  of the
Collateral  in their  possession,  under Section 9-207 of the Code or otherwise,
shall be to deal with it in the same  manner as the  Lenders  deal with  similar
securities,  instruments and property for their own account. Neither the Lenders
nor any of their  employees  or agents  shall be liable  for  failure to demand,
collect or realize  upon any of the  Collateral  or for any delay in doing so or
shall be under any  obligation  to sell or otherwise  dispose of any  Collateral
upon the request of the Borrower or otherwise.

         10. Powers Coupled with an Interest.  All  authorizations  and agencies
herein  contained  with respect to the  Collateral  are  irrevocable  and powers
coupled with an interest.

         11.  Severability.  Any  provision  of this  Pledge  Agreement  that is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining  provisions  hereof,  and any such  prohibition  or
unenforceability   in  any   jurisdiction   shall  not   invalidate   or  render
unenforceable such provision in any other jurisdiction.

         12.  Section  Headings.  The  paragraph  headings  used in this  Pledge
Agreement  are for  convenience  of  reference  only and are not to  affect  the
construction  hereof or to be taken  into  consideration  in the  interpretation
hereof.

         13. No Waiver;  Cumulative  Remedies.  The Lenders shall not by any act
(except  by a written  instrument  pursuant  to  paragraph  14  hereof),  delay,
indulgence,  omission or  otherwise be deemed to have waived any right or remedy
hereunder  or to have  acquiesced  in any  default or Event of Default or in any
breach of any of the terms and conditions  hereof.  No failure to exercise,  nor
any delay in  exercising,  on the part of the Lenders or any of them, any right,
power or privilege  hereunder  shall operate as a waiver  thereof.  No single or
partial exercise of any right,  power or privilege  hereunder shall preclude any
other or further exercise  thereof or the exercise of any other right,  power or
privilege.  A  waiver  by the  Lenders  or any of them of any  right  or  remedy
hereunder  on any one  occasion  shall not be construed as a bar to any right or
remedy that the Lenders would otherwise have on any future occasion.  The rights
and  remedies  herein  provided  are  cumulative,  may be  exercised  singly  or
concurrently and are not exclusive of any rights or remedies provided by law.

         14. Waivers and Amendments; Successors and Assigns; Governing Law. None
of the terms or provisions  of this Pledge  Agreement,  may be waived,  amended,
supplemented or otherwise  modified except by a written  instrument  executed by
the Borrower  and the Lenders  holding a majority of the  outstanding  principal
amount under the Notes, provided that any provision of this Pledge Agreement may
be waived in  writing  by the  Lenders  holding a  majority  of the  outstanding
principal  amount  under  the Notes in a letter or  agreement  executed  by such
Lenders or by facsimile  transmission  from such Lenders.  This Pledge Agreement
shall be binding upon the successors and assigns of the Borrower and shall inure
to the benefit of the Lenders and their respective  successors and assigns. This
Pledge  Agreement  shall be  governed  by,  and  construed  and  interpreted  in
accordance with, the internal laws of the State of Ohio without reference to the
conflict of law provisions, United States of America.

         15. Notices. All notices,  requests,  consents and other communications
hereunder  shall be in writing,  shall be  addressed  to the  receiving  party's
address set forth  below or to such other  address as a party may  designate  by
notice  hereunder,  and  shall be either  (i)  delivered  by hand,  (ii) made by
telecopy or facsimile  transmission,  (iii) sent by overnight  courier,  or (iv)
sent by registered mail, return receipt requested, postage prepaid.



                           Pledge Agreement -- Page 6



         If to the Obligor:                 DynaGen, Inc.
                                            99 Erie Street
                                            Cambridge, Massachusetts 02139
                                            Attention: President
                                            Telecopier: (617) 354-3902

         With a copy to:                    Testa, Hurwitz & Thibeault, LLP
                                            High Street Tower
                                            125 High Street
                                            Boston, MA  02110
                                            Attention: John Hession

         If to the Lenders                  Superior Pharmaceutical Company
                                            1385 Kemper Meadow Drive
                                            Cincinnati, OH 45240-1635
                                            Attention: Eric C. Hagerstrand

         With a copy to:                    Taft, Stettinius & Hollister
                                            1800 Star Bank Center
                                            425 Walnut Street
                                            Cincinnati, OH 45202-3957
                                            Attention: Phil Schultz

         All  notices,  requests,  consents and other  communications  hereunder
shall be deemed to have been  given  either  (i) if by hand,  at the time of the
delivery  thereof to the receiving  party at the address of such party set forth
above,  (ii) if made by telecopy  or  facsimile  transmission,  at the time that
receipt thereof has been  acknowledged by electronic  confirmation or otherwise,
(iii) if sent by overnight  courier,  on the next business day following the day
such notice is delivered to the courier  service,  or (iv) if sent by registered
mail, on the fifth business day following such mailing is made.

         16.  Counterparts.  This  Pledge  Agreement  may be executed in several
counterparts, each of which shall constitute an original, but all of which, when
taken together, shall constitute but one agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



                           Pledge Agreement -- Page 7


         IN WITNESS WHEREOF, the undersigned has caused this Pledge Agreement to
be duly executed and delivered as of the date first above.

                                    BORROWER:

                                    DynaGen, Inc.

                                    By:      /s/ Dhananjay G. Wadekar
                                             -------------------------------
                                    Title:   Executive Vice President
                                             -------------------------------

                                    LENDERS:


                                    By:      /s/ Eric C. Hagerstrand
                                             -------------------------------
                                    Name:    Eric C. Hagerstrand

                                    By:      /s/ Dennis Smith
                                             -------------------------------
                                    Name:    Dennis Smith

                                    By:      /s/ Thomas Canning
                                             -------------------------------
                                    Name:    Thomas Canning




                           Pledge Agreement -- Page 8



                                   Schedule I
                                   ----------

                               Pledged Securities
                               ------------------


NAME OF ISSUER                          DESCRIPTION OF SECURITIES
- --------------                          -------------------------

Superior Pharmaceutical Company         100 shares of Common Stock, no par value



                                                                     EXHIBIT 4.6

THIS NOTE IS SUBJECT TO THE TERMS OF THAT  CERTAIN  INTERCREDITOR  AGREEMENT  OF
EVEN DATE HEREWITH BY AND AMONG MAKER,  THE  HUNTINGTON  NATIONAL  BANK,  PAYEE,
ODYSSEY INVESTMENT PARTNERS, L.P. AND SUPERIOR PHARMACEUTICAL COMPANY


                             SECURED PROMISSORY NOTE


$2,000,000                                                         June 18, 1997


         FOR  VALUE  RECEIVED,  the  undersigned,   DYNAGEN,  INC.,  a  Delaware
corporation  ("Maker"),   promises  to  pay  to  the  order  of  SIRROM  CAPITAL
CORPORATION,   a  Tennessee  corporation  ("Payee";  Payee  and  any  subsequent
holder[s] hereof are hereinafter  referred to collectively as "Holder"),  at the
office of Payee at P. O. Box 30378, Nashville,  Tennessee 37241-0378, or at such
other place as Holder may  designate to Maker in writing from time to time,  the
principal sum of TWO MILLION AND  NO/100THS  DOLLARS  ($2,000,000.00),  together
with interest on the outstanding  principal  balance hereof from the date hereof
at the rate of thirteen and one-half  percent (13.5%) per annum (computed on the
basis of a 360-day year); provided,  however, that Holder may charge and receive
interest upon any renewal or extension hereof at the greater of (i) the rate set
out above, or (ii) any rate agreed to by the  undersigned  that is not in excess
of the maximum rate of interest  allowed to be charged under applicable law (the
"Maximum Rate") at the time of such renewal or extension.

         Interest only on the outstanding  principal balance hereof shall be due
and payable monthly, in arrears, with the first installment being payable on the
first (1st) day of August,  1997, and subsequent  installments  being payable on
the first (1st) day of each succeeding month thereafter until June 17, 2002 (the
"Maturity  Date"),  at which  time the  entire  outstanding  principal  balance,
together  with all accrued and unpaid  interest,  shall be  immediately  due and
payable in full.

         The  indebtedness  evidenced hereby may be prepaid in whole or in part,
at any time and from time to time,  without penalty.  Any such prepayments shall
be credited first to any accrued and unpaid interest and then to the outstanding
principal balance hereof.

         Time is of the essence of this Note. It is hereby expressly agreed that
in the event that any default be made in the payment of principal or interest as
stipulated  above,  which default is not cured within five (5) business days; or
in the event that any default or event of default shall occur under that certain
Loan  Agreement  of  even  date  herewith,  between  Maker,  Payee  and  Odyssey
Investment  Partners,  L.P.  (as may be  amended  from  time to time,  the "Loan
Agreement"), which default or event of default is not cured following the giving
of any applicable notice and within any applicable cure period set forth in said
Loan  Agreement;  or should any default by Maker be made in the  performance  or
observance of any covenants or






conditions  contained  in any other  instrument  or  document  now or  hereafter
evidencing,  securing or otherwise relating to the indebtedness evidenced hereby
(subject to any  applicable  notice and cure period  provisions  that may be set
forth  therein);  then,  and in such  event,  the entire  outstanding  principal
balance  of the  indebtedness  evidenced  hereby,  together  with any other sums
advanced  hereunder,  under the Loan Agreement and/or under any other instrument
or document now or hereafter evidencing,  securing or in any way relating to the
indebtedness  evidenced  hereby,  together  with  all  unpaid  interest  accrued
thereon,  shall,  at the option of Holder and without  notice to Maker,  at once
become  due  and  payable  and may be  collected  forthwith,  regardless  of the
stipulated  date of maturity.  Upon the  occurrence  of any default as set forth
herein,  at the option of Holder and  without  notice to Maker,  all accrued and
unpaid  interest,  if any, shall be added to the outstanding  principal  balance
hereof, and the entire outstanding principal balance, as so adjusted, shall bear
interest  thereafter  until paid at an annual rate (the "Default Rate") equal to
the lesser of (i) the rate that is seven  percentage  points (7.0%) in excess of
the above-specified  interest rate, or (ii) the Maximum Rate in effect from time
to time,  regardless  of  whether or not there has been an  acceleration  of the
payment of principal as set forth herein. All such interest shall be paid at the
time of and as a condition precedent to the curing of any such default.

         In the  event  this Note is  placed  in the  hands of an  attorney  for
collection,  or if Holder  incurs any costs  incident to the  collection  of the
indebtedness  evidenced  hereby,  Maker and any indorsers hereof agree to pay to
Holder an amount  equal to all such  costs,  including  without  limitation  all
actual reasonable attorney's fees and all court costs.

         Presentment for payment,  demand, protest and notice of demand, protest
and  nonpayment  are hereby  waived by Maker and all other  parties  hereto.  No
failure to accelerate  the  indebtedness  evidenced  hereby by reason of default
hereunder,  acceptance of a past-due  installment or other  indulgences  granted
from time to time,  shall be construed as a novation of this Note or as a waiver
of such right of  acceleration  or of the right of Holder  thereafter  to insist
upon strict compliance with the terms of this Note or to prevent the exercise of
such right of acceleration or any other right granted hereunder or by applicable
laws. No extension of the time for payment of the indebtedness  evidenced hereby
or any  installment  due  hereunder,  made by  agreement  with any person now or
hereafter liable for payment of the indebtedness evidenced hereby, shall operate
to release, discharge,  modify, change or affect the original liability of Maker
hereunder or that of any other person now or hereafter liable for payment of the
indebtedness  evidenced hereby, either in whole or in part, unless Holder agrees
otherwise  in  writing.  This  Note may not be  changed  orally,  but only by an
agreement in writing signed by the party against whom enforcement of any waiver,
change, modification or discharge is sought.

         The  indebtedness  and  other  obligations  evidenced  by this Note are
further  evidenced by (i) the Loan Agreement and (ii) certain other  instruments
and  documents,  as may be required to protect and  preserve the rights of Maker
and Payee as more specifically described in the Loan Agreement.





                                        2



         All  agreements  herein made are expressly  limited so that in no event
whatsoever, whether by reason of advancement of proceeds hereof, acceleration of
maturity of the unpaid  balance  hereof or  otherwise,  shall the amount paid or
agreed to be paid to Holder for the use of the money  advanced or to be advanced
hereunder exceed the Maximum Rate. If, from any  circumstances  whatsoever,  the
fulfillment  of any provision of this Note or any other  agreement or instrument
now or hereafter evidencing, securing or in any way relating to the indebtedness
evidenced  hereby shall involve the payment of interest in excess of the Maximum
Rate,  then,  ipso facto,  the  obligation  to pay interest  hereunder  shall be
reduced to the Maximum Rate;  and if from any  circumstance  whatsoever,  Holder
shall  ever  receive  interest,  the  amount of which  would  exceed  the amount
collectible  at the Maximum  Rate,  such amount as would be  excessive  interest
shall be applied to the  reduction of the  principal  balance  remaining  unpaid
hereunder and not to the payment of interest. This provision shall control every
other  provision in any and all other  agreements  and  instruments  existing or
hereafter  arising  between  Maker and Holder with  respect to the  indebtedness
evidenced hereby.

         This Note is intended as a contract  under and shall be  construed  and
enforceable in accordance with the laws of the State of Tennessee, except to the
extent that federal law may be  applicable to the  determination  of the Maximum
Rate.

         As used  herein,  the terms  "Maker"  and  "Holder"  shall be deemed to
include their respective successors,  legal representatives and assigns, whether
by voluntary action of the parties or by operation of law.

                                           MAKER:

                                           DYNAGEN, INC., a Delaware corporation


                                           By:    /s/ Dhananjay G. Wadekar
                                                  -----------------------------
                                           Title: Executive Vice President
                                                  -----------------------------




                                        3


                                                                     EXHIBIT 4.7

THIS NOTE IS SUBJECT TO THE TERMS OF THAT  CERTAIN  INTERCREDITOR  AGREEMENT  OF
EVEN DATE HEREOF BY AND AMONG MAKER, THE HUNTINGTON NATIONAL BANK, PAYEE, SIRROM
CAPITAL CORPORATION AND SUPERIOR PHARMACEUTICAL COMPANY.


                             SECURED PROMISSORY NOTE


$1,000,000                                                         June 18, 1997


         FOR  VALUE  RECEIVED,  the  undersigned,   DYNAGEN,  INC.,  a  Delaware
corporation  ("Maker"),  promises  to pay to the  order  of  ODYSSEY  INVESTMENT
PARTNERS,  L.P., a  Pennsylvania  limited  partnership  ("Payee";  Payee and any
subsequent   holder[s]  hereof  are  hereinafter  referred  to  collectively  as
"Holder"),  at the office of Payee at 950 West Valley Road,  Suite 2902,  Wayne,
Pennsylvania  19087,  or at such other place as Holder may designate to Maker in
writing  from time to time,  the  principal  sum of ONE  MILLION  AND  NO/100THS
DOLLARS  ($1,000,000.00),  together with interest on the  outstanding  principal
balance hereof from the date hereof at the rate of thirteen and one-half percent
(13.5%) per annum (computed on the basis of a 360-day year); provided,  however,
that Holder may charge and receive interest upon any renewal or extension hereof
at the greater of (i) the rate set out above,  or (ii) any rate agreed to by the
undersigned  that is not in excess of the maximum rate of interest allowed to be
charged under applicable law (the "Maximum Rate") at the time of such renewal or
extension.

         Interest only on the outstanding  principal balance hereof shall be due
and payable monthly, in arrears, with the first installment being payable on the
first (1st) day of August,  1997, and subsequent  installments  being payable on
the first (1st) day of each succeeding month thereafter until June 17, 2002 (the
"Maturity  Date"),  at which  time the  entire  outstanding  principal  balance,
together  with all accrued and unpaid  interest,  shall be  immediately  due and
payable in full.

         The  indebtedness  evidenced hereby may be prepaid in whole or in part,
at any time and from time to time,  without penalty.  Any such prepayments shall
be credited first to any accrued and unpaid interest and then to the outstanding
principal balance hereof.

         Time is of the essence of this Note. It is hereby expressly agreed that
in the event that any default be made in the payment of principal or interest as
stipulated  above,  which default is not cured within five (5) business days; or
in the event that any default or event of default shall occur under that certain
Loan  Agreement of even date herewith,  between Maker,  Payee and Sirrom Capital
Corporation (as may be amended from time to time, the "Loan  Agreement"),  which
default or event of default is not cured  following the giving of any applicable
notice and within any applicable  cure period set forth in said Loan  Agreement;
or should any default by Maker be made in the  performance  or observance of any
covenants or









conditions  contained  in any other  instrument  or  document  now or  hereafter
evidencing,  securing or otherwise relating to the indebtedness evidenced hereby
(subject to any  applicable  notice and cure period  provisions  that may be set
forth  therein);  then,  and in such  event,  the entire  outstanding  principal
balance  of the  indebtedness  evidenced  hereby,  together  with any other sums
advanced  hereunder,  under the Loan Agreement and/or under any other instrument
or document now or hereafter evidencing,  securing or in any way relating to the
indebtedness  evidenced  hereby,  together  with  all  unpaid  interest  accrued
thereon,  shall,  at the option of Holder and without  notice to Maker,  at once
become  due  and  payable  and may be  collected  forthwith,  regardless  of the
stipulated  date of maturity.  Upon the  occurrence  of any default as set forth
herein,  at the option of Holder and  without  notice to Maker,  all accrued and
unpaid  interest,  if any, shall be added to the outstanding  principal  balance
hereof, and the entire outstanding principal balance, as so adjusted, shall bear
interest  thereafter  until paid at an annual rate (the "Default Rate") equal to
the lesser of (i) the rate that is seven  percentage  points (7.0%) in excess of
the above-specified  interest rate, or (ii) the Maximum Rate in effect from time
to time,  regardless  of  whether or not there has been an  acceleration  of the
payment of principal as set forth herein. All such interest shall be paid at the
time of and as a condition precedent to the curing of any such default.

         In the  event  this Note is  placed  in the  hands of an  attorney  for
collection,  or if Holder  incurs any costs  incident to the  collection  of the
indebtedness  evidenced  hereby,  Maker and any indorsers hereof agree to pay to
Holder an amount  equal to all such  costs,  including  without  limitation  all
actual reasonable attorney's fees and all court costs.

         Presentment for payment,  demand, protest and notice of demand, protest
and  nonpayment  are hereby  waived by Maker and all other  parties  hereto.  No
failure to accelerate  the  indebtedness  evidenced  hereby by reason of default
hereunder,  acceptance of a past-due  installment or other  indulgences  granted
from time to time,  shall be construed as a novation of this Note or as a waiver
of such right of  acceleration  or of the right of Holder  thereafter  to insist
upon strict compliance with the terms of this Note or to prevent the exercise of
such right of acceleration or any other right granted hereunder or by applicable
laws. No extension of the time for payment of the indebtedness  evidenced hereby
or any  installment  due  hereunder,  made by  agreement  with any person now or
hereafter liable for payment of the indebtedness evidenced hereby, shall operate
to release, discharge,  modify, change or affect the original liability of Maker
hereunder or that of any other person now or hereafter liable for payment of the
indebtedness  evidenced hereby, either in whole or in part, unless Holder agrees
otherwise  in  writing.  This  Note may not be  changed  orally,  but only by an
agreement in writing signed by the party against whom enforcement of any waiver,
change, modification or discharge is sought.

         The  indebtedness  and  other  obligations  evidenced  by this Note are
further  evidenced by (i) the Loan Agreement and (ii) certain other  instruments
and  documents,  as may be required to protect and  preserve the rights of Maker
and Payee as more specifically described in the Loan Agreement.





                                        2




         All  agreements  herein made are expressly  limited so that in no event
whatsoever, whether by reason of advancement of proceeds hereof, acceleration of
maturity of the unpaid  balance  hereof or  otherwise,  shall the amount paid or
agreed to be paid to Holder for the use of the money  advanced or to be advanced
hereunder exceed the Maximum Rate. If, from any  circumstances  whatsoever,  the
fulfillment  of any provision of this Note or any other  agreement or instrument
now or hereafter evidencing, securing or in any way relating to the indebtedness
evidenced  hereby shall involve the payment of interest in excess of the Maximum
Rate,  then,  ipso facto,  the  obligation  to pay interest  hereunder  shall be
reduced to the Maximum Rate;  and if from any  circumstance  whatsoever,  Holder
shall  ever  receive  interest,  the  amount of which  would  exceed  the amount
collectible  at the Maximum  Rate,  such amount as would be  excessive  interest
shall be applied to the  reduction of the  principal  balance  remaining  unpaid
hereunder and not to the payment of interest. This provision shall control every
other  provision in any and all other  agreements  and  instruments  existing or
hereafter  arising  between  Maker and Holder with  respect to the  indebtedness
evidenced hereby.

         This Note is intended as a contract  under and shall be  construed  and
enforceable in accordance with the laws of the State of Tennessee, except to the
extent that federal law may be  applicable to the  determination  of the Maximum
Rate.

         As used  herein,  the terms  "Maker"  and  "Holder"  shall be deemed to
include their respective successors,  legal representatives and assigns, whether
by voluntary action of the parties or by operation of law.

                                           MAKER:

                                           DYNAGEN, INC., a Delaware corporation


                                           By:    /s/ Dhananjay G. Wadekar
                                                  ----------------------------
                                           Title: Executive Vice President
                                                  ----------------------------




                                        3


                                                                     EXHIBIT 4.8

                             STOCK PURCHASE WARRANT

         This Warrant is issued this 18 day of June,  1997, by DYNAGEN,  INC., a
Delaware corporation (the "Company"), to SIRROM CAPITAL CORPORATION, a Tennessee
corporation   (SIRROM  CAPITAL   CORPORATION  and  any  subsequent  assignee  or
transferee  hereof are  hereinafter  referred  to  collectively  as  "Holder" or
"Holders").


                                   AGREEMENT:

         1.  ISSUANCE  OF  WARRANT;  TERM.  For and in  consideration  of SIRROM
CAPITAL CORPORATION making a loan to the Company in an amount of Two Million and
no/100ths Dollars ($2,000,000.00)  pursuant to the terms of a secured promissory
note of even date herewith (the "Note") and related loan  agreement of even date
herewith (the "Loan Agreement"), and other good and valuable consideration,  the
receipt and  sufficiency  of which are hereby  acknowledged,  the Company hereby
grants to Holder the right to purchase  266,700  shares of the Company's  common
stock (the "Common Stock"). The shares of Common Stock issuable upon exercise of
this Warrant are hereinafter  referred to as the "Shares." This Warrant shall be
exercisable  at any time and from time to time from the date  hereof  until July
31, 2002.

         2. EXERCISE PRICE. The exercise price (the "Exercise  Price") per share
for which all or any of the Shares  may be  purchased  pursuant  to the terms of
this Warrant shall be One Cent ($.01).

         3.       EXERCISE.

                  (a) This Warrant may be  exercised  by the Holder  hereof (but
         only  on  the  conditions  hereinafter  set  forth)  as to  all  or any
         increment or increments of One Thousand  (1,000) Shares (or the balance
         of the  Shares if less than such  number),  upon  delivery  of  written
         notice of intent to exercise to the Company at the  following  address:
         99 Erie Street, Cambridge, Massachusetts 02139 or such other address as
         the Company shall  designate in a written  notice to the Holder hereof,
         together  with this Warrant and payment to the Company of the aggregate
         Exercise Price of the Shares so purchased.  The Exercise Price shall be
         payable,  at the option of the Holder,  (i) by certified or bank check,
         or (ii) by the  surrender  of the Note or  portion  thereof  having  an
         outstanding principal balance equal to the aggregate Exercise Price. In
         addition to and  without  limiting  the rights of the Holder  under the
         terms of this Warrant, the Holder shall have the right (the "Conversion
         Right") to convert this  Warrant or any portion  thereof into shares of
         Common  Stock as provided  in this  Section at any time or from time to
         time prior to its  expiration.  In lieu of exercising  this Warrant for
         cash,  the Holder may elect to  surrender a portion of this Warrant for
         conversion  and to receive shares of Common Stock equal to the value of
         this  Warrant  (or  the  portion  being   cancelled,   surrendered  and
         converted) by surrender of this Warrant to the Company









         together  with notice of such  election.  Upon such event,  the Company
         shall  issue to the Holder a number of shares of the  Company's  Common
         Stock computed by using the following formula:

                                     X = Y (A - B)
                                         ---------
                                             A

         Where:   X = the  number of shares of Common  Stock to be issued to the
                  Holder;

                  Y = the  number  of shares of  Common  Stock to  otherwise  be
                  purchased under this Warrant;

                  A = the Fair  Market  Value of one share of the Common  Stock;
                  and

                  B = the Exercise Price of the Warrant (as adjusted to the date
                  of the calculation).

                  Upon  exercise  of the  Conversion  Right  with  respect  to a
particular  number of Shares,  the Company shall deliver to the Holder,  without
payment by the Holder of any exercise price or any cash or other  consideration,
that number of Shares equal to the number  computed using the above formula.  No
fractional  shares shall be issuable upon exercise of the Conversion  Right, and
the number of shares to be issued in accordance  with the  foregoing  formula is
other than a whole  number,  the Company  shall round down to the nearest  whole
number the total  number of shares to be issued.  For  purposes of this  Section
3(a),  the term "Fair  Market  Value" shall mean the average last sale price per
share of Common Stock during the five (5) trading days immediately preceding the
effective date of conversion. If the Common Stock is not publicly traded at such
time, Fair Market Value shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser. The third appraiser,




                                        2





                  regardless  of who  appoints  him or her,  shall have the same
                  qualifications as the first two appraisers.

                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid one-half by the Company and one-half by the Holder.

                  (b) Upon  exercise of this Warrant as  aforesaid,  the Company
         shall as promptly as practicable,  and in any event within fifteen (15)
         days  thereafter,  execute and deliver to the Holder of this  Warrant a
         certificate  or  certificates  for the total number of whole Shares for
         which this Warrant is being  exercised in such names and  denominations
         as are  requested  by such Holder.  If this Warrant  shall be exercised
         with  respect  to less  than all of the  Shares,  the  Holder  shall be
         entitled  to  receive a new  Warrant  covering  the number of Shares in
         respect of which this Warrant shall not have been exercised,  which new
         Warrant shall in all other  respects be identical to this Warrant.  The
         Company  covenants  and  agrees  that it will  pay when due any and all
         state and  federal  issue  taxes which may be payable in respect of the
         issuance of this Warrant or the issuance of any Shares upon exercise of
         this Warrant.

         4. COVENANTS AND  CONDITIONS.  The above  provisions are subject to the
following:

                  (a) Neither this  Warrant nor the Shares have been  registered
         under the Securities Act of 1933, as amended  ("Securities Act") or any
         state securities laws ("Blue Sky Laws"). This Warrant has been acquired
         for investment  purposes and not with a view to  distribution or resale
         and may not be pledged, hypothecated,  sold, made subject to a security
         interest,   or   otherwise   transferred   without  (i)  an   effective
         registration  statement for such Warrant under the  Securities  Act and
         such  applicable  Blue Sky Laws,  or (ii) an opinion of counsel,  which
         opinion and counsel shall be reasonably satisfactory to the Company and
         its counsel, that registration is not required under the Securities Act
         or under any applicable Blue Sky Laws (the Company hereby  acknowledges
         that Bass, Berry & Sims is acceptable counsel).  Transfer of the shares
         issued upon the exercise of this  Warrant  shall be  restricted  in the
         same manner and to the same extent as the Warrant and the  certificates
         representing such Shares shall bear substantially the following legend:

                  THE SHARES OF COMMON  STOCK  REPRESENTED  BY THIS  CERTIFICATE
                  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
                  AMENDED (THE "ACT"),  OR ANY APPLICABLE  STATE  SECURITIES LAW
                  AND MAY NOT BE TRANSFERRED UNTIL (I) A REGISTRATION  STATEMENT
                  UNDER THE ACT OR SUCH APPLICABLE  STATE  SECURITIES LAWS SHALL
                  HAVE BECOME EFFECTIVE WITH REGARD THERETO,




                                        3





                  OR (II) IN THE OPINION OF COUNSEL  ACCEPTABLE  TO THE COMPANY,
                  REGISTRATION  UNDER SUCH  SECURITIES  ACTS OR SUCH  APPLICABLE
                  STATE  SECURITIES LAWS IS NOT REQUIRED IN CONNECTION WITH SUCH
                  PROPOSED TRANSFER.

The Holder  hereof and the Company  agree to execute  such other  documents  and
instruments as counsel for the Company  reasonably deems necessary to effect the
compliance of the issuance of this Warrant and any shares of Common Stock issued
upon exercise hereof with applicable federal and state securities laws.

                  (b) The Company covenants and agrees that all Shares which may
         be issued upon exercise of this Warrant will, upon issuance and payment
         therefor, be legally and validly issued and outstanding, fully paid and
         nonassessable,  free from all  taxes,  liens,  charges  and  preemptive
         rights,  if any, with respect thereto or to the issuance  thereof.  The
         Company shall at all times reserve and keep available for issuance upon
         the  exercise of this Warrant  such number of  authorized  but unissued
         shares of Common Stock as will be  sufficient to permit the exercise in
         full of this Warrant.

                  (c) The  Company  covenants  and agrees that it shall not sell
         any shares of the  Company's  capital  stock at a price  below the fair
         market  value  (as  reasonably  determined  by the  Company's  board of
         directors)  of such shares,  without the prior  written  consent of the
         Holder  hereof.  In the  event  that the  Company  sells  shares of the
         Company's  capital stock in violation of this Section 4(c),  the number
         of shares of Common Stock  issuable upon exercise of this Warrant shall
         be equal to the product  obtained by  multiplying  the number of shares
         then  issuable  pursuant  to  this  Warrant  prior  to  such  sale by a
         fraction,  the numerator of which shall be the product of (x) the total
         number of shares of Common Stock  outstanding  on a fully diluted basis
         immediately  after such  issuance or sale,  multiplied  by (y) the fair
         market  value  immediately  prior  to such  issuance  or  sale  and the
         denominator  of which  shall be the sum of (i) the  number of shares of
         Common Stock  outstanding on a fully diluted basis immediately prior to
         such issuance or sale  multiplied by the fair market value  immediately
         prior to such issuance or sale,  plus (ii) the aggregate  amount of the
         consideration  received by the Company  upon such  issuance or sale (as
         illustrated on Schedule I hereto).

         5. TRANSFER OF WARRANT.  Subject to the provisions of Section 4 hereof,
this Warrant may be transferred,  in whole or in part, to any person or business
entity, by presentation of the Warrant to the Company with written  instructions
for such  transfer.  Upon such  presentation  for  transfer,  the Company  shall
promptly execute and deliver a new Warrant or Warrants in the form hereof in the
name of the assignee or  assignees  and in the  denominations  specified in such
instructions.  The Company  shall pay all expenses  incurred by it in connection
with the preparation, issuance and delivery of Warrants under this Section.





                                        4





         6. WARRANT HOLDER NOT SHAREHOLDER; RIGHTS OFFERING. Except as otherwise
provided  herein,  this  Warrant does not confer upon the Holder,  as such,  any
right whatsoever as a shareholder of the Company. Notwithstanding the foregoing,
if the Company  should offer to all of the Company's  shareholders  the right to
purchase any securities of the Company, then all shares of Common Stock that are
subject  to this  Warrant  shall be  deemed to be  outstanding  and owned by the
Holder and the Holder shall be entitled to participate in such rights offering.

         7.       [INTENTIONALLY OMITTED]

         8.       ADJUSTMENT UPON CHANGES IN STOCK.

                  (a) If all or any portion of this  Warrant  shall be exercised
         subsequent  to  any  stock  split,  stock  dividend,  recapitalization,
         combination of shares of the Company, or other similar event, occurring
         after the date hereof,  then the Holder  exercising  this Warrant shall
         receive, for the aggregate price paid upon such exercise, the aggregate
         number and class of shares  which such  Holder  would have  received if
         this Warrant had been exercised  immediately prior to such stock split,
         stock  dividend,  recapitalization,  combination  of  shares,  or other
         similar event. If any adjustment under this Section 8(a) would create a
         fractional  share of Common  Stock or a right to  acquire a  fractional
         share of Common Stock,  such fractional  share shall be disregarded and
         the number of shares  subject to this Warrant  shall be the next higher
         number of shares,  rounding all fractions upward.  Whenever there shall
         be an  adjustment  pursuant to this  Section  8(a),  the Company  shall
         forthwith  notify  the  Holder  or  Holders  of  this  Warrant  of such
         adjustment,  setting forth in reasonable detail the event requiring the
         adjustment and the method by which such adjustment was calculated.

                  (b) If all or any portion of this  Warrant  shall be exercised
         subsequent   to  any   merger,   consolidation,   exchange  of  shares,
         separation,  reorganization  or  liquidation  of the Company,  or other
         similar event,  occurring  after the date hereof,  as a result of which
         shares of Common  Stock  shall be changed  into the same or a different
         number of shares of the same or another  class or classes of securities
         of the  Company or another  entity,  then the  Holder  exercising  this
         Warrant shall receive, for the aggregate price paid upon such exercise,
         the  aggregate  number and class of shares which such Holder would have
         received if this Warrant had been exercised  immediately  prior to such
         merger, consolidation,  exchange of shares, separation,  reorganization
         or liquidation,  or other similar event.  If any adjustment  under this
         Section 8(b) would create a fractional share of Common Stock or a right
         to acquire a fractional  share of Common Stock,  such fractional  share
         shall be  disregarded  and the number of shares subject to this Warrant
         shall be the next  higher  number of  shares,  rounding  all  fractions
         upward.  Whenever there shall be an adjustment pursuant to this Section
         8(b), the Company shall forthwith  notify the Holder or Holders of this
         Warrant of such  adjustment,  setting  forth in  reasonable  detail the
         event  requiring the adjustment and the method by which such adjustment
         was calculated.





                                        5





         9.       PUT AND SUBSTITUTION AGREEMENT.

                  (a) The Company hereby irrevocably grants and issues to Holder
         the right and  option to sell to the  Company  (the  "First  Put") this
         Warrant for a period of 30 days immediately  following three years from
         the date hereof, at a purchase price (the "First Purchase Price") equal
         to  $667,000 or Holder may  substitute  this  Warrant for that  certain
         Stock  Purchase  Warrant  of even  date  herewith  issued  by  Superior
         Pharmaceutical Company, an Ohio corporation and wholly owned subsidiary
         of  the  Company   (the   "Subsidiary   Warrant")   ("First   Right  of
         Substitution").

                  (b) The  Company  shall pay to the Holder  the First  Purchase
         Price,  in cash or certified or  cashier's  check,  in exchange for the
         delivery to the Company of this Warrant within  forty-five (45) days of
         the  receipt of  written  notice,  addressed  as set forth in Section 3
         hereto,  from the Holder of its intention to exercise the First Put and
         stating the First Purchase Price in accordance with this Section 9.

                  (c) Neither the First Put nor the First Right of  Substitution
         may be  exercised  by  Holder  if the fair  market  value of all of the
         Shares  originally  issuable  pursuant  to this  Warrant is equal to or
         greater than $667,000 on the date three years from the date hereof.

                  (d) The fair market value of each share of Common Stock of the
         Company  issuable  pursuant to this  Warrant  shall be the average last
         sale price per share of Common  Stock  during the five (5) trading days
         preceding  the date  three  (3)  years  from the date  hereof or if the
         Common Stock is not publicly traded at such time shall be determined as
         follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the fair
                  market  value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.




                                        6






                           (iii) The fair market value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid one-half by the Company and one-half by the Holder.

         10.      PUT AND SUBSTITUTION AGREEMENT.

                  (a) The Company hereby irrevocably grants and issues to Holder
         the right and option to sell to the  Company  (the  "Second  Put") this
         Warrant for a period of 30 days  immediately  following five years from
         the date  hereof,  at a purchase  price (the "Second  Purchase  Price")
         equal to  $1,000,000  or  substitute  this  Warrant for the  Subsidiary
         Warrant ("Second Right of Substitution").

                  (b) The  Company  shall pay to the Holder the Second  Purchase
         Price,  in cash or certified or  cashier's  check,  in exchange for the
         delivery to the Company of this Warrant  within thirty (30) days of the
         receipt of written notice,  addressed as set forth in Section 3 hereto,
         from the Holder of its intention to exercise the Second Put and stating
         the Second Purchase Price in accordance with this Section 10.

                  (c)   Neither   the  Second  Put  nor  the  Second   Right  of
         Substitution may be exercised by Holder if the fair market value of all
         of the Shares originally  issuable pursuant to this Warrant is equal to
         or greater than $1,000,000 on the date five years from the date hereof.

                  (d) The fair market value of each share of Common Stock of the
         Company  issuable  pursuant to this  Warrant  shall be the average last
         sale price per share of Common  Stock  during the five (5) trading days
         preceding  the date five  years  from the date  hereof or if the Common
         Stock is not  publicly  traded  at such  time  shall be  determined  as
         follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the fair
                  market  value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the




                                        7





                  two appraisers, and if they cannot agree on a third appraiser,
                  the American  Arbitration  Association shall appoint the third
                  appraiser. The third appraiser, regardless of who appoints him
                  or her,  shall have the same  qualifications  as the first two
                  appraisers.

                           (iii) The fair market value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid one-half by the Company and one-half by the Holder.

         11.      REGISTRATION.

                  (a) The Company and the holders of the Shares agree that if at
         any time after the date  hereof  the  Company  shall  propose to file a
         registration  statement with respect to the  underwritten  issuance and
         sale by the Company of any of its Common Stock on a form suitable for a
         secondary  offering,  it will give  notice in writing to such effect to
         the registered  holder(s) of the Shares at least thirty (30) days prior
         to such  filing,  and,  at the written  request of any such  registered
         holder, made within five (5) business after the receipt of such notice,
         will include  therein at the Company's cost and expense  (including the
         fees  and  expenses  of  counsel  to  such  holder(s),   but  excluding
         underwriting discounts, commissions and filing fees attributable to the
         Shares  included  therein) such of the Shares as such  holder(s)  shall
         request;  provided,  however,  that if the offering being registered by
         the  Company  is  underwritten  and  if  the   representative   of  the
         underwriters  certifies  in writing that the  inclusion  therein of the
         Shares would materially and adversely affect the sale of the securities
         to be sold  by the  Company  thereunder,  then  the  Company  shall  be
         required to include in the  offering  only that  number of  securities,
         including the Shares,  which the  underwriters  determine in their sole
         discretion  will  not  jeopardize  the  success  of the  offering  (the
         securities  so  included to be  apportioned  pro rata among all selling
         shareholders according to the total amount of securities entitled to be
         included  therein  owned by each selling  shareholder,  but in no event
         shall the total number of Shares  included in the offering be less than
         the number of  securities  included in the offering by any other single
         selling shareholder).

                  (b) Whenever the Company undertakes to effect the registration
         of any of the Shares, the Company shall, as expeditiously as reasonably
         possible:

                           (i) Prepare and file with the Securities and Exchange
                  Commission  (the   "Commission")   a  registration   statement
                  covering  such  Shares and use its best  efforts to cause such
                  registration   statement  to  be  declared  effective  by  the
                  Commission  as  expeditiously  as  possible  and to keep  such
                  registration  effective until the earlier of (A) the date when
                  all Shares  covered by the  registration  statement  have been
                  sold or (B) two hundred  seventy (270) days from the effective
                  date of the  registration  statement;  provided,  that  before
                  filing a




                                        8





                  registration  statement  or  prospectus  or any  amendment  or
                  supplements  thereto,  the Company will furnish to each Holder
                  of  Shares  covered  by such  registration  statement  and the
                  underwriters, if any, copies of all such documents proposed to
                  be filed  (excluding  exhibits,  unless any such person  shall
                  specifically  request  exhibits),   which  documents  will  be
                  subject to the review of such  Holders and  underwriters,  and
                  the Company will not file such  registration  statement or any
                  amendment thereto or any prospectus or any supplement  thereto
                  (including any documents  incorporated  by reference  therein)
                  with the  Commission if (A) the  underwriters,  if any,  shall
                  reasonably object to such filing or (B) if information in such
                  registration  statement or prospectus  concerning a particular
                  selling   Holder   has   changed   and  such   Holder  or  the
                  underwriters, if any, shall reasonably object.

                           (ii)  Prepare  and  file  with  the  Commission  such
                  amendments and post-effective  amendments to such registration
                  statement  as may  be  necessary  to  keep  such  registration
                  statement  effective  during the period referred to in Section
                  11(b)(i) and to comply with the  provisions of the  Securities
                  Act with respect to the disposition of all securities  covered
                  by such registration statement, and cause the prospectus to be
                  supplemented by any required prospectus supplement,  and as so
                  supplemented to be filed with the Commission  pursuant to Rule
                  424 under the Securities Act.

                           (iii) Furnish to the selling  Holder(s)  such numbers
                  of  copies  of such  registration  statement,  each  amendment
                  thereto,   the  prospectus   included  in  such   registration
                  statement  (including  each  preliminary   prospectus),   each
                  supplement  thereto  and  such  other  documents  as they  may
                  reasonably  request in order to facilitate the  disposition of
                  the Shares owned by them.

                           (iv) Use its best  efforts to  register  and  qualify
                  under  such other  securities  laws of such  jurisdictions  as
                  shall be reasonably requested by any selling Holder and do any
                  and  all  other  acts  and  things  which  may  be  reasonably
                  necessary  or  advisable  to  enable  such  selling  Holder to
                  consummate the disposition of the Shares owned by such Holder,
                  in such  jurisdictions;  provided,  however,  that the Company
                  shall  not  be  required  in  connection  therewith  or  as  a
                  condition thereto to qualify to transact business or to file a
                  general  consent to  service of process in any such  states or
                  jurisdictions.

                           (v)  Promptly  notify  each  selling  Holder  of  the
                  happening  of any event as a result  of which  the  prospectus
                  included  in such  registration  statement  contains an untrue
                  statement  of a material  fact or omits any fact  necessary to
                  make the statements therein not misleading and, at the request
                  of any such Holder,  the Company will prepare a supplement  or
                  amendment to such prospectus so that, as thereafter  delivered
                  to the  purchasers of such Shares,  such  prospectus  will not
                  contain  an untrue  statement  of a  material  fact or omit to
                  state any fact  necessary to make the  statements  therein not
                  misleading and




                                        9





                  the  Holder(s)  shall  suspend  trading at the  request of the
                  Company  if  upon  advice  of  counsel  to the  Company,  such
                  suspension is advisable.

                           (vi) Provide a transfer  agent and  registrar for all
                  such  Shares  not  later  than  the  effective  date  of  such
                  registration statement.

                           (vii) Enter into such customary agreements (including
                  underwriting  agreements  in  customary  form  for  a  primary
                  offering) and take all such other actions as the underwriters,
                  if any,  reasonably request in order to expedite or facilitate
                  the disposition of such Shares (including, without limitation,
                  effecting a stock split or a combination of shares).

                           (viii) Make  available for  inspection by any selling
                  Holder or any  underwriter  participating  in any  disposition
                  pursuant  to such  registration  statement  and any  attorney,
                  accountant or other agent  retained by any such selling Holder
                  or  underwriter,  all financial and other  records,  pertinent
                  corporate  documents and properties of the Company,  and cause
                  the officers, directors, employees and independent accountants
                  of the Company to supply all information  reasonably requested
                  by any such seller, underwriter, attorney, accountant or agent
                  in connection with such registration statement.

                           (ix)  Promptly  notify the selling  Holder(s) and the
                  underwriters,   if  any,  of  the  following  events  and  (if
                  requested by any such person)  confirm  such  notification  in
                  writing:  (A) the filing of the  prospectus or any  prospectus
                  supplement and the registration statement and any amendment or
                  post-effective  amendment  thereto  and,  with  respect to the
                  registration   statement  or  any   post-effective   amendment
                  thereto,   the  declaration  of  the   effectiveness  of  such
                  documents,  (B) any requests by the  Commission for amendments
                  or supplements to the registration statement or the prospectus
                  or for additional  information,  (C) the issuance or threat of
                  issuance by the  Commission of any stop order  suspending  the
                  effectiveness of the registration  statement or the initiation
                  of any  proceedings  for that purpose,  and (D) the receipt by
                  the Company of any notification with respect to the suspension
                  of  the   qualification   of  the   Shares  for  sale  in  any
                  jurisdiction  or the initiation or threat of initiation of any
                  proceeding  for such purposes and the Holder(s)  shall suspend
                  trading at the  request  of the  Company if upon the advice of
                  counsel to the Company, such suspension is advisable.

                           (x) Make every reasonable effort to prevent the entry
                  of any order suspending the  effectiveness of the registration
                  statement  and  obtain at the  earliest  possible  moment  the
                  withdrawal of any such order, if entered.

                           (xi)  Cooperate  with the selling  Holder(s)  and the
                  underwriters, if any, to facilitate the timely preparation and
                  delivery of  certificates  representing  the Shares to be sold
                  and not bearing any restrictive legends, and enable such




                                       10





                  Shares to be in such lots and  registered in such names as the
                  underwriters  may request at least two (2) business days prior
                  to any delivery of the Shares to the underwriters.

                           (xii)  Provide a CUSIP  number for all the Shares not
                  later than the effective date of the registration statement.

                           (xiii)   [INTENTIONALLY OMITTED]

                           (xiv)  Otherwise  use its best efforts to comply with
                  all applicable  rules and regulations of the  Commission,  and
                  make  generally  available  to its security  holders  earnings
                  statements  satisfying  the provisions of Section 11(a) of the
                  Securities  Act, no later than  forty-five (45) days after the
                  end of any  twelve-month  period (or ninety (90) days, if such
                  period  is a fiscal  year)  (A)  commencing  at the end of any
                  fiscal quarter in which the Shares are sold to underwriters in
                  a firm or best efforts  underwritten  offering,  or (B) if not
                  sold to underwriters  in such an offering,  beginning with the
                  first  month  of the  first  fiscal  quarter  of  the  Company
                  commencing  after  the  effective  date  of  the  registration
                  statement,  which  statements  shall  cover such  twelve-month
                  periods.

                  (c) The Company's  obligations  under Section 11(a) above with
         respect to each holder of Shares are  expressly  conditioned  upon such
         holder's   furnishing  to  the  Company  in  writing  such  information
         concerning such holder and the terms of such holder's proposed offering
         as  the  Company  shall   reasonably   request  for  inclusion  in  the
         registration  statement. If any registration statement including any of
         the Shares is filed,  then the  Company  shall  indemnify  each  holder
         thereof (and each underwriter for such holder and each person,  if any,
         who controls such underwriter within the meaning of the Securities Act)
         from any loss, claim, damage or liability arising out of, based upon or
         in any  way  relating  to  any  untrue  statement  of a  material  fact
         contained  in such  registration  statement  or any  omission  to state
         therein a material fact  required to be stated  therein or necessary to
         make  the  statements  therein  not  misleading,  except  for any  such
         statement or omission based on information furnished in writing by such
         holder  of the  Shares  expressly  for  use  in  connection  with  such
         registration  statement;  and such holder shall  indemnify  the Company
         (and  each  of  its  officers  and   directors   who  has  signed  such
         registration  statement,  each  director,  each  person,  if  any,  who
         controls the Company  within the meaning of the  Securities  Act,  each
         underwriter for the Company and each person,  if any, who controls such
         underwriter  within the meaning of the  Securities  Act) and each other
         such holder against any loss,  claim,  damage or liability arising from
         any  such  statement  or  omission  which  was  made in  reliance  upon
         information  furnished  in writing to the Company by such holder of the
         Shares   expressly  for  use  in  connection  with  such   registration
         statement.

                  (d) For  purposes of this  Section 11, all of the Shares shall
         be deemed to be issued and outstanding.





                                       11





                  (e) The rights contained in this Section 11 shall expire as to
         any holder of Shares that is able to sell  Shares  pursuant to Rule 144
         under the Securities Act.

         12. CERTAIN NOTICES. In case at any time the Company shall propose to:

                  (a)      declare any cash dividend upon its Common Stock;

                  (b)  declare any  dividend  upon its Common  Stock  payable in
         stock or make any special dividend or other distribution to the holders
         of its Common Stock;

                  (c) offer for subscription to the holders of any of its Common
         Stock any additional shares of stock in any class or other rights;

                  (d)  reorganize,  or  reclassify  the  capital  stock  of  the
         Company,  or consolidate,  merge or otherwise combine with, or sell all
         or substantially all of its assets to, another corporation; or

                  (e) voluntarily or involuntarily  dissolve,  liquidate or wind
         up the affairs of the Company;

         then,  in any one or more of said cases,  the Company shall give to the
         Holder of the Warrant,  by certified or registered  mail,  (i) at least
         twenty (20) days' prior  written  notice of the date on which the books
         of the  Company  shall  close  or a  record  shall  be  taken  for such
         dividend, distribution or subscription rights or for determining rights
         to  vote  in  respect  of any  such  reorganization,  reclassification,
         consolidation,  merger, sale,  dissolution,  liquidation or winding up,
         and  (ii)  in  the  case  of  such  reorganization,   reclassification,
         consolidation, merger, sale, dissolution, liquidation or winding up, at
         least twenty (20) days' prior written  notice of the date when the same
         shall take place. Any notice required by clause (i) shall also specify,
         in the case of any such dividend,  distribution or subscription rights,
         the date on  which  the  holders  of  Common  Stock  shall be  entitled
         thereto,  and any notice required by clause (ii) shall specify the date
         on which the  holders of Common  Stock  shall be  entitled  to exchange
         their Common Stock for  securities or other property  deliverable  upon
         such  reorganization,  reclassification,  consolidation,  merger, sale,
         dissolution, liquidation or winding up, as the case may be.

         13. EQUITY PARTICIPATION. This Warrant is issued in connection with the
         Loan Agreement.  It is intended that this Warrant  constitute an equity
         participation  under and pursuant to T.C.A.  ss.47-24-101,  et seq. and
         that such equity participation be permitted under said statutes and not
         constitute interest on the Note. If under any circumstances whatsoever,
         fulfillment of any obligation of this Warrant,  the Loan Agreement,  or
         any other  agreement or document  executed in connection  with the Loan
         Agreement,  shall  violate  the lawful  limit of any  applicable  usury
         statute or any other  applicable law with regard to obligations of like
         character  and amount,  then the  obligation  to be fulfilled  shall be
         reduced to such lawful limit, such that in no event




                                       12





         shall there occur, under this Warrant, the Loan Agreement, or any other
         document or instrument  executed in connection with the Loan Agreement,
         any  violation  of such  lawful  limit,  but such  obligation  shall be
         fulfilled to the lawful limit. If any sum is collected in excess of the
         lawful  limit,  such  excess  shall be applied to reduce the  principal
         amount of the Note.

         14.  GOVERNING  LAW.  This warrant shall be governed by the laws of the
         State of Tennessee  applicable to agreements  made entirely  within the
         State.

         15.   SEVERABILITY.   If  any  provision(s)  of  this  Warrant  or  the
         application  thereof to any person or circumstances shall be invalid or
         unenforceable  to any extent,  the  remainder  of this  Warrant and the
         application of such provisions to other persons or circumstances  shall
         not be affected  thereby and shall be enforced to the  greatest  extent
         permitted by law.

         16.  COUNTERPARTS.  This  Warrant  may be  executed  in any  number  of
         counterparts  and be  different  parties to this  Warrant  in  separate
         counterparts,  each of which when so executed  shall be deemed to be an
         original and all of which taken together  shall  constitute one and the
         same Warrant.

         17.  JURISDICTION  AND  VENUE.  The  Company  hereby  consents  to  the
         jurisdiction  of the  courts of the State of  Tennessee  and the United
         States District Court for the Middle District of Tennessee,  as well as
         to the  jurisdiction  of all  courts  from which an appeal may be taken
         from  such  courts,  for the  purpose  of any  suit,  action  or  other
         proceeding  arising out of any of its  obligations  arising  under this
         Agreement or with respect to the transactions  contemplated hereby, and
         expressly  waives any and all objections it may have as to venue in any
         such courts.






                                       13





         IN WITNESS  WHEREOF,  the parties hereto have set their hands as of the
date first above written.

                                           DYNAGEN, INC., a Delaware corporation


                                           By:    /s/ Dhananjay G. Wadekar
                                                  -----------------------------
                                           Title: Executive Vice President
                                                  -----------------------------


                                           SIRROM CAPITAL CORPORATION, a
                                           Tennessee corporation



                                           By:     /s/ [Illegible}
                                                  -----------------------------
                                           Title:  Vice President
                                                  -----------------------------






                                       14




                                   SCHEDULE I

                     ILLUSTRATION OF ANTI-DILUTION PROVISION


Assumptions:

Outstanding Common Stock:           100,000 Shares
(fully diluted)

Fair Market Value per share:        $10

New Issuance:                       20,000 Shares

New Issue Price (all in)            $8

Debt Warrant:                       10,000 Shares

FMV of Warrant Shares:              $100,000 ($10 x 10,000 shares)

Formula:

         10,000  x             (120,000 x $10)
                       ---------------------------------
                       (100,000 x $10)  +  (20,000 x $8)

         10,000  x   1,200,000
                     ---------
                     1,160,000

         10,000  x  1.0345

Adjusted No. of Warrant Shares:     10,344.83

Percentage of Outstanding: 10,344.83  =  0.0862
                           ---------
                            120,000

FMV of Adj. Warrant Shares: .0862  x  1,160,000  =  $100,000





                                       15






                                                                     EXHIBIT 4.9

                             STOCK PURCHASE WARRANT

         This Warrant is issued this 18th day of June, 1997, by DYNAGEN, INC., a
Delaware corporation (the "Company"),  to ODYSSEY INVESTMENT  PARTNERS,  L.P., a
Pennsylvania  limited  partnership  (ODYSSEY INVESTMENT  PARTNERS,  L.P. and any
subsequent   assignee  or  transferee   hereof  are   hereinafter   referred  to
collectively as "Holder" or "Holders").


                                   AGREEMENT:

         1.       ISSUANCE OF WARRANT; TERM. For and in consideration of ODYSSEY
INVESTMENT  PARTNERS,  L.P.  making a loan to the  Company  in an  amount of One
Million and no/100ths Dollars ($1,000,000.00) pursuant to the terms of a secured
promissory note of even date herewith (the "Note") and related loan agreement of
even date herewith (the "Loan  Agreement"),  the payment of $150, and other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged,  the Company hereby grants to Holder the right to purchase 133,300
shares of the Company's common stock (the "Common Stock").  The shares of Common
Stock issuable upon exercise of this Warrant are hereinafter  referred to as the
"Shares."  This Warrant shall be  exercisable  at any time and from time to time
two (2) years from the date hereof until July 31, 2002. In exercising its rights
and  obligations  hereunder,  the  Company  agrees to treat  the  Holder no less
favorably than it treats Sirrom Capital  Corporation  ("Sirrom") pursuant to the
Stock Purchase Warrant issued by the Company to Sirrom on the date hereof.

         2.       EXERCISE PRICE. The exercise price (the "Exercise  Price") per
share for this Warrant shall be One Cent ($.01).

         3.       EXERCISE.

                  (a) This Warrant may be  exercised  by the Holder  hereof (but
         only  on  the  conditions  hereinafter  set  forth)  as to  all  or any
         increment or increments of One Thousand  (1,000) Shares (or the balance
         of the  Shares if less than such  number),  upon  delivery  of  written
         notice of intent to exercise to the Company at the  following  address:
         99 Erie Street, Cambridge, Massachusetts 02139 or such other address as
         the Company shall  designate in a written  notice to the Holder hereof,
         together  with this Warrant and payment to the Company of the aggregate
         Exercise Price of the Shares so purchased.  The Exercise Price shall be
         payable,  at the option of the Holder,  (i) by certified or bank check,
         or (ii) by the  surrender  of the Note or  portion  thereof  having  an
         outstanding principal balance equal to the aggregate Exercise Price. In
         addition to and  without  limiting  the rights of the Holder  under the
         terms of this Warrant, the Holder shall have the right (the "Conversion
         Right") to convert this  Warrant or any portion  thereof into shares of
         Common  Stock as provided  in this  Section at any time or from time to
         time prior to its  expiration.  In lieu of exercising  this Warrant for
         cash,  the Holder may elect to  surrender a portion of this Warrant for
         conversion and to receive









         shares  of Common  Stock  equal to the  value of this  Warrant  (or the
         portion being  cancelled,  surrendered  and  converted) by surrender of
         this Warrant to the Company together with notice of such election. Upon
         such event, the Company shall issue to the Holder a number of shares of
         the Company's Common Stock computed by using the following formula:

                                  X = Y (A - B)
                                        A

         Where:   X = the  number of shares of Common  Stock to be issued to the
                  Holder;

                  Y = the  number  of shares of  Common  Stock to  otherwise  be
                  purchased under this Warrant;

                  A = the Fair  Market  Value of one share of the Common  Stock;
                  and

                  B = the Exercise Price of the Warrant (as adjusted to the date
                  of the calculation).

                  Upon  exercise  of the  Conversion  Right  with  respect  to a
particular  number of Shares,  the Company shall deliver to the Holder,  without
payment by the Holder of any exercise price or any cash or other  consideration,
that number of Shares equal to the number  computed using the above formula.  No
fractional  shares shall be issuable upon exercise of the Conversion  Right, and
the number of shares to be issued in accordance  with the  foregoing  formula is
other than a whole  number,  the Company  shall round down to the nearest  whole
number the total  number of shares to be issued.  For  purposes of this  Section
3(a),  the term "Fair  Market  Value" shall mean the average last sale price per
share of Common Stock during the five (5) trading days immediately preceding the
effective date of conversion. If the Common Stock is not publicly traded at such
time, Fair Market Value shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by




                                        2





                  the  two  appraisers,  and if  they  cannot  agree  on a third
                  appraiser,  the American Arbitration Association shall appoint
                  the third appraiser.  The third  appraiser,  regardless of who
                  appoints him or her, shall have the same qualifications as the
                  first two appraisers.

                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid by the Company.

                  (b) Upon  exercise of this Warrant as  aforesaid,  the Company
         shall as promptly as practicable,  and in any event within fifteen (15)
         days  thereafter,  execute and deliver to the Holder of this  Warrant a
         certificate  or  certificates  for the total number of whole Shares for
         which this Warrant is being  exercised in such names and  denominations
         as are  requested  by such Holder.  If this Warrant  shall be exercised
         with  respect  to less  than all of the  Shares,  the  Holder  shall be
         entitled  to  receive a new  Warrant  covering  the number of Shares in
         respect of which this Warrant shall not have been exercised,  which new
         Warrant shall in all other  respects be identical to this Warrant.  The
         Company  covenants  and  agrees  that it will  pay when due any and all
         state and  federal  issue  taxes which may be payable in respect of the
         issuance of this Warrant or the issuance of any Shares upon exercise of
         this Warrant.

         4.       COVENANTS AND CONDITIONS.  The above provisions are subject to
         the following:

                  (a) Neither this  Warrant nor the Shares have been  registered
         under the Securities Act of 1933, as amended  ("Securities Act") or any
         state securities laws ("Blue Sky Laws"). This Warrant has been acquired
         for investment  purposes and not with a view to  distribution or resale
         and may not be pledged, hypothecated,  sold, made subject to a security
         interest,   or   otherwise   transferred   without  (i)  an   effective
         registration  statement for such Warrant under the  Securities  Act and
         such  applicable  Blue Sky Laws,  or (ii) an opinion of counsel,  which
         opinion and counsel shall be reasonably satisfactory to the Company and
         its counsel, that registration is not required under the Securities Act
         or under any applicable Blue Sky Laws (the Company hereby  acknowledges
         that Bass, Berry & Sims is acceptable counsel).  Transfer of the shares
         issued upon the exercise of this  Warrant  shall be  restricted  in the
         same manner and to the same extent as the Warrant and the  certificates
         representing such Shares shall bear substantially the following legend:

                  THE SHARES OF COMMON  STOCK  REPRESENTED  BY THIS  CERTIFICATE
                  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
                  AMENDED (THE "ACT"),  OR ANY APPLICABLE  STATE  SECURITIES LAW
                  AND MAY NOT BE TRANSFERRED UNTIL (I) A REGISTRATION  STATEMENT
                  UNDER THE ACT OR




                                        3





                  SUCH  APPLICABLE  STATE  SECURITIES  LAWS  SHALL  HAVE  BECOME
                  EFFECTIVE  WITH  REGARD  THERETO,  OR (II) IN THE  OPINION  OF
                  COUNSEL  ACCEPTABLE  TO THE COMPANY,  REGISTRATION  UNDER SUCH
                  SECURITIES  ACTS OR SUCH APPLICABLE  STATE  SECURITIES LAWS IS
                  NOT REQUIRED IN CONNECTION WITH SUCH PROPOSED TRANSFER.

The Holder  hereof and the Company  agree to execute  such other  documents  and
instruments as counsel for the Company  reasonably deems necessary to effect the
compliance of the issuance of this Warrant and any shares of Common Stock issued
upon exercise hereof with applicable federal and state securities laws.

                  (b) The Company covenants and agrees that all Shares which may
         be issued upon exercise of this Warrant will, upon issuance and payment
         therefor, be legally and validly issued and outstanding, fully paid and
         nonassessable,  free from all  taxes,  liens,  charges  and  preemptive
         rights,  if any, with respect thereto or to the issuance  thereof.  The
         Company shall at all times reserve and keep available for issuance upon
         the  exercise of this Warrant  such number of  authorized  but unissued
         shares of Common Stock as will be  sufficient to permit the exercise in
         full of this Warrant.

                  (c) The  Company  covenants  and agrees that it shall not sell
         any shares of the  Company's  capital  stock at a price  below the fair
         market  value  (as  reasonably  determined  by the  Company's  board of
         directors)  of such shares,  without the prior  written  consent of the
         Holder  hereof.  In the  event  that the  Company  sells  shares of the
         Company's  capital stock in violation of this Section 4(c),  the number
         of shares of Common Stock  issuable upon exercise of this Warrant shall
         be equal to the product  obtained by  multiplying  the number of shares
         then  issuable  pursuant  to  this  Warrant  prior  to  such  sale by a
         fraction,  the numerator of which shall be the product of (x) the total
         number of shares of Common Stock  outstanding  on a fully diluted basis
         immediately  after such  issuance or sale,  multiplied  by (y) the fair
         market  value  immediately  prior  to such  issuance  or  sale  and the
         denominator  of which  shall be the sum of (i) the  number of shares of
         Common Stock  outstanding on a fully diluted basis immediately prior to
         such issuance or sale  multiplied by the fair market value  immediately
         prior to such issuance or sale,  plus (ii) the aggregate  amount of the
         consideration  received by the Company  upon such  issuance or sale (as
         illustrated on Schedule I hereto).

         5.       TRANSFER OF WARRANT.  Subject to the  provisions  of Section 4
hereof,  this Warrant may be transferred,  in whole or in part, to any person or
business  entity,  by  presentation  of the Warrant to the Company  with written
instructions for such transfer. Upon such presentation for transfer, the Company
shall promptly  execute and deliver a new Warrant or Warrants in the form hereof
in the name of the assignee or assignees and in the  denominations  specified in
such  instructions.  The  Company  shall  pay  all  expenses  incurred  by it in
connection  with the  preparation,  issuance and delivery of Warrants under this
Section.




                                        4






         6.       WARRANT HOLDER NOT  SHAREHOLDER;  RIGHTS  OFFERING.  Except as
otherwise  provided  herein,  this Warrant  does not confer upon the Holder,  as
such, any right whatsoever as a shareholder of the Company.  Notwithstanding the
foregoing,  if the Company should offer to all of the Company's shareholders the
right to purchase any securities of the Company, then all shares of Common Stock
that are subject to this Warrant shall be deemed to be outstanding  and owned by
the  Holder and the Holder  shall be  entitled  to  participate  in such  rights
offering.

         7.       [INTENTIONALLY OMITTED]

         8.       ADJUSTMENT UPON CHANGES IN STOCK.

                  (a) If all or any portion of this  Warrant  shall be exercised
         subsequent  to  any  stock  split,  stock  dividend,  recapitalization,
         combination of shares of the Company, or other similar event, occurring
         after the date hereof,  then the Holder  exercising  this Warrant shall
         receive, for the aggregate price paid upon such exercise, the aggregate
         number and class of shares  which such  Holder  would have  received if
         this Warrant had been exercised  immediately prior to such stock split,
         stock  dividend,  recapitalization,  combination  of  shares,  or other
         similar event. If any adjustment under this Section 8(a) would create a
         fractional  share of Common  Stock or a right to  acquire a  fractional
         share of Common Stock,  such fractional  share shall be disregarded and
         the number of shares  subject to this Warrant  shall be the next higher
         number of shares,  rounding all fractions upward.  Whenever there shall
         be an  adjustment  pursuant to this  Section  8(a),  the Company  shall
         forthwith  notify  the  Holder  or  Holders  of  this  Warrant  of such
         adjustment,  setting forth in reasonable detail the event requiring the
         adjustment and the method by which such adjustment was calculated.

                  (b) If all or any portion of this  Warrant  shall be exercised
         subsequent   to  any   merger,   consolidation,   exchange  of  shares,
         separation,  reorganization  or  liquidation  of the Company,  or other
         similar event,  occurring  after the date hereof,  as a result of which
         shares of Common  Stock  shall be changed  into the same or a different
         number of shares of the same or another  class or classes of securities
         of the  Company or another  entity,  then the  Holder  exercising  this
         Warrant shall receive, for the aggregate price paid upon such exercise,
         the  aggregate  number and class of shares which such Holder would have
         received if this Warrant had been exercised  immediately  prior to such
         merger, consolidation,  exchange of shares, separation,  reorganization
         or liquidation,  or other similar event.  If any adjustment  under this
         Section 8(b) would create a fractional share of Common Stock or a right
         to acquire a fractional  share of Common Stock,  such fractional  share
         shall be  disregarded  and the number of shares subject to this Warrant
         shall be the next  higher  number of  shares,  rounding  all  fractions
         upward.  Whenever there shall be an adjustment pursuant to this Section
         8(b), the Company shall forthwith  notify the Holder or Holders of this
         Warrant of such  adjustment,  setting  forth in  reasonable  detail the
         event  requiring the adjustment and the method by which such adjustment
         was calculated.





                                        5





         9.       PUT AND SUBSTITUTION AGREEMENT.

                  (a) The Company hereby irrevocably grants and issues to Holder
         the right and option to sell to the Company  (the  "Put") this  Warrant
         for a period of 30 days immediately  following five years from the date
         hereof,  at a purchase price (the "Purchase  Price") equal to the lower
         of (i) an amount  based upon  seven  times the  Company's  consolidated
         EBITDA  for  the  twelve-month  period  ending  May 31,  2002,  or (ii)
         $500,000 or Holder may  substitute  this Warrant for that certain Stock
         Purchase   Warrant   of  even  date   herewith   issued   by   Superior
         Pharmaceutical Company, an Ohio corporation and wholly owned subsidiary
         of the Company (the "Subsidiary  Warrant")  ("Right of  Substitution").
         For purposes of this Warrant  "EBITDA" means net income,  plus interest
         expense,   plus  income  taxes,   plus   depreciation   expense,   plus
         amortization expense, all determined in accordance with GAAP. If Sirrom
         Capital Corporation  executes its right of substitution with respect to
         its Stock  Purchase  Warrant of even date  herewith on or prior to five
         (5) years from the date hereof,  then the Company shall notify  Holder,
         and Holder may exercise the Right of  Substitution on the same terms as
         Sirrom Capital Corporation.

                  (b) The Company shall pay to the Holder,  in cash or certified
         or cashier's  check, the Purchase Price in exchange for the delivery to
         the Company of this Warrant within  forty-five (45) days of the receipt
         of written notice, addressed as set forth in Section 3 hereto, from the
         Holder of its  intention  to exercise  the Put and stating the Purchase
         Price in accordance with this Section 9.

                  (c)  Neither  the Put nor the  Right  of  Substitution  may be
         exercised  by  Holder  if the fair  market  value of all of the  Shares
         originally  issuable  pursuant  to this  Warrant is equal to or greater
         than $3.75 per Share on the date five years from the date hereof.

                  (d) The fair market value of each share of Common Stock of the
         Company  issuable  pursuant to this  Warrant  shall be the average last
         sale  price per  share of Common  Stock  regular  way on the  principal
         national  securities  exchange on which the  Company's  common stock is
         listed  and  traded  during  the  five  (5)  trading  days  immediately
         preceding  the date five  years  from the date  hereof or if the Common
         Stock is not so  publicly  traded at such time shall be  determined  as
         follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.





                                        6





                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the fair
                  market  value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.

                           (iii) The fair market value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid by the Company.

         10.      REGISTRATION.

                  (a) The Company and the holders of the Shares agree that if at
         any time after the date  hereof  the  Company  shall  propose to file a
         registration  statement with respect to the  underwritten  issuance and
         sale by the Company any of its Common  Stock on a form  suitable  for a
         secondary  offering,  it will give  notice in writing to such effect to
         the registered  holder(s) of the Shares at least thirty (30) days prior
         to such  filing,  and,  at the written  request of any such  registered
         holder,  made within five (5)  business  days after the receipt of such
         notice,  will  include  therein  at  the  Company's  cost  and  expense
         (including  the fees and  expenses  of counsel to such  holder(s),  but
         excluding   underwriting   discounts,   commissions   and  filing  fees
         attributable to the Shares included therein) such of the Shares as such
         holder(s) shall request; provided,  however, that if the offering being
         registered by the Company is underwritten and if the  representative of
         the underwriters certifies in writing that the inclusion therein of the
         Shares would materially and adversely affect the sale of the securities
         to be sold  by the  Company  thereunder,  then  the  Company  shall  be
         required to include in the  offering  only that  number of  securities,
         including the Shares,  which the  underwriters  determine in their sole
         discretion  will  not  jeopardize  the  success  of the  offering  (the
         securities  so  included to be  apportioned  pro rata among all selling
         shareholders according to the total amount of securities entitled to be
         included  therein  owned by each selling  shareholder,  but in no event
         shall the total number of Shares  included in the offering be less than
         the number of  securities  included in the offering by any other single
         selling shareholder).





                                        7





                  (b) Whenever the Company undertakes to effect the registration
         of any of the Shares, the Company shall, as expeditiously as reasonably
         possible:

                           (i) Prepare and file with the Securities and Exchange
                  Commission  (the   "Commission")   a  registration   statement
                  covering  such  Shares and use its best  efforts to cause such
                  registration   statement  to  be  declared  effective  by  the
                  Commission  as  expeditiously  as  possible  and to keep  such
                  registration  effective until the earlier of (A) the date when
                  all Shares  covered by the  registration  statement  have been
                  sold or (B) two hundred  seventy (270) days from the effective
                  date of the  registration  statement;  provided,  that  before
                  filing a registration statement or prospectus or any amendment
                  or  supplements  thereto,  the  Company  will  furnish to each
                  Holder of Shares  covered by such  registration  statement and
                  the  underwriters,  if  any,  copies  of  all  such  documents
                  proposed  to be filed  (excluding  exhibits,  unless  any such
                  person shall specifically  request exhibits),  which documents
                  will  be   subject  to  the   review  of  such   Holders   and
                  underwriters,  and the Company will not file such registration
                  statement or any  amendment  thereto or any  prospectus or any
                  supplement  thereto  (including any documents  incorporated by
                  reference   therein)   with   the   Commission   if  (A)   the
                  underwriters,  if any, shall reasonably  object to such filing
                  or  (B) if  information  in  such  registration  statement  or
                  prospectus  concerning a particular selling Holder has changed
                  and such Holder or the underwriters,  if any, shall reasonably
                  object.

                           (ii)  Prepare  and  file  with  the  Commission  such
                  amendments and post-effective  amendments to such registration
                  statement  as may  be  necessary  to  keep  such  registration
                  statement  effective  during the period referred to in Section
                  10(b)(i) and to comply with the  provisions of the  Securities
                  Act with respect to the disposition of all securities  covered
                  by such registration statement, and cause the prospectus to be
                  supplemented by any required prospectus supplement,  and as so
                  supplemented to be filed with the Commission  pursuant to Rule
                  424 under the Securities Act.

                           (iii) Furnish to the selling  Holder(s)  such numbers
                  of  copies  of such  registration  statement,  each  amendment
                  thereto,   the  prospectus   included  in  such   registration
                  statement  (including  each  preliminary   prospectus),   each
                  supplement  thereto  and  such  other  documents  as they  may
                  reasonably  request in order to facilitate the  disposition of
                  the Shares owned by them.

                           (iv) Use its best  efforts to  register  and  qualify
                  under  such other  securities  laws of such  jurisdictions  as
                  shall be reasonably requested by any selling Holder and do any
                  and  all  other  acts  and  things  which  may  be  reasonably
                  necessary  or  advisable  to  enable  such  selling  Holder to
                  consummate the disposition of the Shares owned by such Holder,
                  in such  jurisdictions;  provided,  however,  that the Company
                  shall not be required in connection




                                        8





                  therewith  or as a  condition  thereto to qualify to  transact
                  business or to file a general consent to service of process in
                  any such states or jurisdictions.

                           (v)  Promptly  notify  each  selling  Holder  of  the
                  happening  of any event as a result  of which  the  prospectus
                  included  in such  registration  statement  contains an untrue
                  statement  of a material  fact or omits any fact  necessary to
                  make the statements therein not misleading and, at the request
                  of any such Holder,  the Company will prepare a supplement  or
                  amendment to such prospectus so that, as thereafter  delivered
                  to the  purchasers of such Shares,  such  prospectus  will not
                  contain  an untrue  statement  of a  material  fact or omit to
                  state any fact  necessary to make the  statements  therein not
                  misleading  and the  Holder(s)  shall  suspend  trading at the
                  request  of the  Company  if upon  advice  of  counsel  to the
                  Company, such suspension is advisable.

                           (vi) Provide a transfer  agent and  registrar for all
                  such  Shares  not  later  than  the  effective  date  of  such
                  registration statement.

                           (vii) Enter into such customary agreements (including
                  underwriting  agreements  in  customary  form  for  a  primary
                  offering) and take all such other actions as the underwriters,
                  if any,  reasonably request in order to expedite or facilitate
                  the disposition of such Shares (including, without limitation,
                  effecting a stock split or a combination of shares).

                           (viii) Make  available for  inspection by any selling
                  Holder or any  underwriter  participating  in any  disposition
                  pursuant  to such  registration  statement  and any  attorney,
                  accountant or other agent  retained by any such selling Holder
                  or  underwriter,  all financial and other  records,  pertinent
                  corporate  documents and properties of the Company,  and cause
                  the officers, directors, employees and independent accountants
                  of the Company to supply all information  reasonably requested
                  by any such seller, underwriter, attorney, accountant or agent
                  in connection with such registration statement.

                           (ix)  Promptly  notify the selling  Holder(s) and the
                  underwriters,   if  any,  of  the  following  events  and  (if
                  requested by any such person)  confirm  such  notification  in
                  writing:  (A) the filing of the  prospectus or any  prospectus
                  supplement and the registration statement and any amendment or
                  post-effective  amendment  thereto  and,  with  respect to the
                  registration   statement  or  any   post-effective   amendment
                  thereto,   the  declaration  of  the   effectiveness  of  such
                  documents,  (B) any requests by the  Commission for amendments
                  or supplements to the registration statement or the prospectus
                  or for additional  information,  (C) the issuance or threat of
                  issuance by the  Commission of any stop order  suspending  the
                  effectiveness of the registration  statement or the initiation
                  of any  proceedings  for that purpose,  and (D) the receipt by
                  the Company of any notification with respect to the suspension
                  of  the   qualification   of  the   Shares  for  sale  in  any
                  jurisdiction or the initiation or threat of initiation



                                        9




                  of any  proceeding  for such purposes and the Holder(s)  shall
                  suspend  trading at the  request of the Company if upon advice
                  of counsel to the Company, such suspension is advisable.

                           (x) Make every reasonable effort to prevent the entry
                  of any order suspending the  effectiveness of the registration
                  statement  and  obtain at the  earliest  possible  moment  the
                  withdrawal of any such order, if entered.

                           (xi)  Cooperate  with the selling  Holder(s)  and the
                  underwriters, if any, to facilitate the timely preparation and
                  delivery of  certificates  representing  the Shares to be sold
                  and not  bearing  any  restrictive  legends,  and enable  such
                  Shares to be in such lots and  registered in such names as the
                  underwriters  may request at least two (2) business days prior
                  to any delivery of the Shares to the underwriters.

                           (xii)  Provide a CUSIP  number for all the Shares not
                  later than the effective date of the registration statement.

                           (xiii) [Intentionally Omitted]

                           (xiv)  Otherwise  use its best efforts to comply with
                  all applicable  rules and regulations of the  Commission,  and
                  make  generally  available  to its security  holders  earnings
                  statements  satisfying  the provisions of Section 11(a) of the
                  Securities  Act, no later than  forty-five (45) days after the
                  end of any  twelve-month  period (or ninety (90) days, if such
                  period  is a fiscal  year)  (A)  commencing  at the end of any
                  fiscal quarter in which the Shares are sold to underwriters in
                  a firm or best efforts  underwritten  offering,  or (B) if not
                  sold to underwriters  in such an offering,  beginning with the
                  first  month  of the  first  fiscal  quarter  of  the  Company
                  commencing  after  the  effective  date  of  the  registration
                  statement,  which  statements  shall  cover such  twelve-month
                  periods.

                  (c) The Company's  obligations  under Section 11(a) above with
         respect to each holder of Shares are  expressly  conditioned  upon such
         holder's   furnishing  to  the  Company  in  writing  such  information
         concerning such holder and the terms of such holder's proposed offering
         as  the  Company  shall   reasonably   request  for  inclusion  in  the
         registration  statement. If any registration statement including any of
         the Shares is filed,  then the  Company  shall  indemnify  each  holder
         thereof (and each underwriter for such holder and each person,  if any,
         who controls such underwriter within the meaning of the Securities Act)
         from any loss, claim, damage or liability arising out of, based upon or
         in any  way  relating  to  any  untrue  statement  of a  material  fact
         contained  in such  registration  statement  or any  omission  to state
         therein a material fact  required to be stated  therein or necessary to
         make  the  statements  therein  not  misleading,  except  for any  such
         statement or omission based on information furnished in writing by such
         holder  of the  Shares  expressly  for  use  in  connection  with  such
         registration  statement;  and such holder shall  indemnify  the Company
         (and each of its officers and directors




                                       10





         who has signed such registration statement, each director, each person,
         if any, who controls the Company  within the meaning of the  Securities
         Act,  each  underwriter  for the Company and each  person,  if any, who
         controls such underwriter within the meaning of the Securities Act) and
         each other such holder  against any loss,  claim,  damage or  liability
         arising from any such  statement or omission which was made in reliance
         upon information  furnished in writing to the Company by such holder of
         the  Shares  expressly  for use in  connection  with such  registration
         statement.

                  (d) For  purposes of this  Section 10, all of the Shares shall
         be deemed to be issued and outstanding.

                  (e) The rights contained in this Section 10 shall expire as to
         any holder of Shares that is able to sell  Shares  pursuant to Rule 144
         under the Securities Act.

         11.      CERTAIN NOTICES. In case at any time the Company shall propose
                  to:

                  (a)      declare any cash dividend upon its Common Stock;

                  (b)      declare any dividend upon its Common Stock payable in
         stock or make any special dividend or other distribution to the holders
         of its Common Stock;

                  (c)      offer for  subscription  to the holders of any of its
         Common  Stock  any  additional  shares  of stock in any  class or other
         rights;

                  (d)      reorganize,  or  reclassify  the capital stock of the
         Company,  or consolidate,  merge or otherwise combine with, or sell all
         or substantially all of its assets to, another corporation; or

                  (e)      voluntarily or involuntarily  dissolve,  liquidate or
         wind up the affairs of the Company;

         then,  in any one or more of said cases,  the Company shall give to the
         Holder of the Warrant,  by certified or registered  mail,  (i) at least
         twenty (20) days' prior  written  notice of the date on which the books
         of the  Company  shall  close  or a  record  shall  be  taken  for such
         dividend, distribution or subscription rights or for determining rights
         to  vote  in  respect  of any  such  reorganization,  reclassification,
         consolidation,  merger, sale,  dissolution,  liquidation or winding up,
         and  (ii)  in  the  case  of  such  reorganization,   reclassification,
         consolidation, merger, sale, dissolution, liquidation or winding up, at
         least twenty (20) days' prior written  notice of the date when the same
         shall take place. Any notice required by clause (i) shall also specify,
         in the case of any such dividend,  distribution or subscription rights,
         the date on  which  the  holders  of  Common  Stock  shall be  entitled
         thereto,  and any notice required by clause (ii) shall specify the date
         on which the  holders of Common  Stock  shall be  entitled  to exchange
         their Common Stock for  securities or other property  deliverable  upon
         such reorganization,




                                       11





         reclassification, consolidation, merger, sale, dissolution, liquidation
         or winding up, as the case may be.

         12.      GOVERNING  LAW.  This warrant shall be governed by the laws of
         the State of Tennessee  applicable to agreements  made entirely  within
         the State.

         13.      SEVERABILITY.  If any  provision(s)  of  this  Warrant  or the
         application  thereof to any person or circumstances shall be invalid or
         unenforceable  to any extent,  the  remainder  of this  Warrant and the
         application of such provisions to other persons or circumstances  shall
         not be affected  thereby and shall be enforced to the  greatest  extent
         permitted by law.

         14.      COUNTERPARTS.  This  Warrant  may be executed in any number of
         counterparts  and be  different  parties to this  Warrant  in  separate
         counterparts,  each of which when so executed  shall be deemed to be an
         original and all of which taken together  shall  constitute one and the
         same Warrant.

         15.      JURISDICTION  AND VENUE.  The Company  hereby  consents to the
         jurisdiction  of the  courts of the State of  Tennessee  and the United
         States District Court for the Middle District of Tennessee,  as well as
         to the  jurisdiction  of all  courts  from which an appeal may be taken
         from  such  courts,  for the  purpose  of any  suit,  action  or  other
         proceeding  arising out of any of its  obligations  arising  under this
         Agreement or with respect to the transactions  contemplated hereby, and
         expressly  waives any and all objections it may have as to venue in any
         such courts.




                                       12





         IN WITNESS  WHEREOF,  the parties hereto have set their hands as of the
date first above written.

                                     DYNAGEN, INC., a Delaware corporation


                                     By: /s/  Dhananjay G. Wadekar
                                        ----------------------------------

                                     Title: Executive Vice President
                                           -------------------------------


                                     ODYSSEY INVESTMENT PARTNERS, L.P., a
                                     Pennsylvania limited partnership

                                     By:  ODYSSEY ASSOCIATES, L.P., its General
                                     Partner

                                     By:  ODYSSEY ASSOCIATES, INC., its General
                                     Partner



                                     By:   /s/  ILLEGIBLE
                                        ----------------------------------

                                     Title:  President
                                           -------------------------------




                                       13





                                   SCHEDULE I
                                   ----------

                     Illustration of Anti-Dilution Provision
                     ---------------------------------------

Assumptions:

Outstanding Common Stock:          100,000 Shares
(fully diluted)

Fair Market Value per share:       $10

New Issuance:                      20,000 Shares

New Issue Price (all in)           $8

Debt Warrant:                      10,000 Shares

FMV of Warrant Shares:             $100,000 ($10 x 10,000 shares)

Formula:

         10,000  x            (120,000 x $10)
                    ---------------------------------
                    (100,000 x $10)  +  (20,000 x $8)

         10,000  x  1,200,000
                    ---------
                    1,160,000

         10,000  x  1.0345

Adjusted No. of Warrant Shares:     10,344.83

Percentage of Outstanding: 10,344.83  =  0.0862
                          -----------
                            120,000

FMV of Adj. Warrant Shares: .0862  x  1,160,000  =  $100,000





                                       14



                                                                    EXHIBIT 4.10

                          PLEDGE AND SECURITY AGREEMENT
                                   (Borrower)


         THIS PLEDGE AND SECURITY AGREEMENT ("Agreement"),  dated June 18, 1997,
by and between  DynaGen,  Inc., a Delaware  corporation  ("Borrower") and Sirrom
Capital  Corporation,  a Tennessee  corporation,  with its principal  office and
place of  business  in  Nashville,  Tennessee  ("Sirrom")  for itself and in its
capacity as Collateral Agent pursuant to that certain Collateral Agent Agreement
of even date herewith (the "Agency Agreement") by and between Sirrom and Odyssey
Investment  Partners,  L.P.,  a  Pennsylvania  limited  partnership  ("Odyssey")
(Sirrom and Odyssey are sometimes referred to herein collectively as "Lenders").


                                   WITNESSETH:

         WHEREAS,  pursuant to a Loan  Agreement of even date  herewith,  by and
between Borrower and Lenders (the "Loan Agreement"),  Lenders have made loans to
Borrower in the original  principal amount of $3,000,000 (the "Loan").  The Loan
is  evidenced  by a  Secured  Promissory  Note of  even  date  herewith,  in the
principal  amount of $2,000,000,  made and executed by Borrower,  payable to the
order  of  Sirrom   (herein   referred  to,   together   with  any   extensions,
modifications, renewals and/or replacements thereof, as the "Sirrom Note") and a
Secured  Promissory  Note of even  date  herewith,  in the  principal  amount of
$1,000,000,  made and  executed  by  Borrower,  payable  to the order of Odyssey
(herein  referred to,  together  with any  extensions,  modifications,  renewals
and/or  replacements  thereof,  as the "Odyssey  Note") (the Sirrom Note and the
Odyssey Note are sometimes referred to herein collectively as the "Notes") .

         WHEREAS,  it is a condition  of Lenders'  agreement to make the Loan to
Borrower that Borrower execute and deliver this Agreement to Sirrom.


                                   AGREEMENT:

         NOW  THEREFORE,  in  consideration  of the  foregoing,  and  to  enable
Borrower to obtain  loans and other  extensions  of credit  from  Lenders and to
induce Lenders to have transactions with Borrower, Borrower agrees as follows:

         1. Pledge. Subject to the terms of that certain Subordination Agreement
of even  date  herewith  among  Lenders  and  former  shareholders  of  Superior
Pharmaceutical  Company,  as collateral security for the payment and performance
in full of the Obligations (as  hereinafter  defined),  Borrower hereby pledges,
hypothecates, assigns, transfers, sets over and delivers unto Sirrom, and hereby
grants to Sirrom a security interest in, the collateral  described in Schedule A
hereto, together with the proceeds thereof and all cash, additional




                                        1





securities  or other  property at any time and from time to time  receivable  or
otherwise  distributable  in respect of, in exchange for, or in substitution for
any and all such pledged securities (all such pledged  securities,  the proceeds
thereof,  cash,  dividends,  additional  securities  and other  property  now or
hereafter  pledged  hereunder are hereinafter  collectively  called the "Pledged
Securities");

         TO HAVE AND TO HOLD the Pledged  Securities,  together with all rights,
titles,  interests,  powers, privileges and preferences pertaining or incidental
thereto,  unto Sirrom,  its successors  and assigns;  subject,  however,  to the
terms, covenants and conditions hereinafter set forth.

         Upon delivery to Sirrom, the Pledged Securities shall be accompanied by
executed  stock  powers in blank and by such other  instruments  or documents as
Sirrom or its counsel may reasonably request.  Each delivery of certificates for
such Pledged Securities shall be accompanied by a schedule showing the number of
shares  and  the  numbers  of the  certificates  theretofore  and  then  pledged
hereunder, which schedule shall be attached hereto as Schedule A and made a part
hereof.  Each  schedule  so  delivered  shall  supersede  any prior  schedule so
delivered.

         2.  Obligations  Secured.  This  Agreement  is made,  and the  security
interest  created  hereby is granted  to  Sirrom,  to secure  full  payment  and
performance  of any and all  indebtedness  and other  obligations of Borrower to
Lenders, direct or contingent,  however evidenced or denominated, and however or
whenever incurred,  including without limitation  indebtedness incurred pursuant
to any past, present or future commitment of Lenders to Borrower  (regardless of
the  class  of  such  future  advance),   including,   without  limitation,  the
indebtedness  evidenced by the Notes (collectively the  "Obligations").  Lenders
acknowledge  that the  Collateral  is  presently  pledged to certain  other note
holders who have a first priority  pledge  pursuant to a Pledge  Agreement dated
June 18, 1997 by and between Borrower,  Thomas Canning,  Eric C. Hagerstrand and
Dennis Smith (the "Senior Pledge Agreement").

         3.  Representations  and  Warranties.  Borrower  hereby  represents and
warrants  to Sirrom (a) that  Borrower is the legal and  equitable  owner of the
Pledged Securities,  that Borrower has the complete and unconditional  authority
to pledge the Pledged  Securities  being  pledged by it, and holds the same free
and clear of all liens,  charges,  encumbrances and security  interests of every
kind and nature except for the pledge pursuant to the Senior Pledge Agreement in
favor of Thomas Canning,  Eric C.  Hagerstrand and Dennis Smith,  which shall be
released  on or before June  18,  2000 at which time  Sirrom  shall have a first
priority pledge and security interest in the Pledged Securities; and (b) that no
consent or approval of any governmental body or regulatory authority,  or of any
other party,  which was or is necessary to the validity of this pledge,  has not
been  obtained.  Borrower  further  represents  and warrants that no part of the
Obligations will be used to purchase or carry any "margin stock",  as defined in
Regulation U of the Board of Governors of the Federal Reserve System, 12 CFR ss.
221.1 et seq.





                                        2





         4. Registration in Nominee Name;  Denominations.  Subject to the rights
of the pledgees under the Senior Pledge  Agreement,  Sirrom shall have the right
(in its sole and absolute discretion) to hold the certificates  representing the
Pledged  Securities in its own name or in the name of the Borrower,  endorsed or
assigned in blank or in favor of Sirrom.  Borrower  shall  deliver to Sirrom all
certificates  representing  the  Pledged  Securities  promptly  upon  receipt by
Borrower.  Upon request and delivery of  certificates  representing  the Pledged
Securities to the issuer of the Pledged Securities, Sirrom may have such Pledged
Securities  registered  in the name of  Sirrom or any  nominee  or  nominees  of
Sirrom.  Sirrom shall at all times have the right to exchange  the  certificates
representing   Pledged   Securities  for   certificates  of  smaller  or  larger
denominations for any purpose consistent with this Agreement.

         5.  Remedies  Upon  Default.  Subject to the  priority  interest in the
Collateral  and the rights  contained in the Senior Pledge  Agreement,  upon the
occurrence of a default or Event of Default under the Loan Agreement,  or in the
event that any representation or warranty herein shall prove to have been untrue
when made,  then,  and in any such event,  Sirrom  shall have all of the rights,
privileges and remedies of a secured party under the Uniform  Commercial Code as
in effect in the State of Tennessee, and without limiting the foregoing,  Sirrom
may (a) collect any and all amounts payable in respect of the Pledged Securities
and exercise any and all rights, privileges,  options and remedies of the holder
and  owner  thereof,  and  (b)  sell,  transfer  and/or  negotiate  the  Pledged
Securities,  or any part  thereof,  at public or private  sale,  for cash,  upon
credit or for  future  delivery  as Sirrom  shall  deem  appropriate,  including
without limitation,  at Sirrom's option, the purchase of all or any part of said
securities at any public sale by Sirrom.  Upon  consummation of any sale, Sirrom
shall  have the right to  assign,  transfer  and  deliver  to the  purchaser  or
purchasers  thereof the Pledged  Securities so sold.  Each such purchaser at any
such sale shall hold the property sold absolutely,  free from any claim or right
on the part of the  Borrower,  and the  Borrower  hereby  waives  (to the extent
permitted by law) all rights of redemption,  stay or appraisal that Borrower now
has or may at any time in the future  have under any rule of law or statute  now
existing or hereinafter  enacted.  Borrower  hereby  expressly  waives notice to
redeem and notice of the time, place and manner of such sale.

         6.  Application  of  Proceeds.  The  proceeds  of the  sale of  Pledged
Securities  sold pursuant to Section 5 hereof,  and the proceeds of the exercise
of any of  Sirrom's  other  remedies  hereunder,  shall be  applied by Sirrom as
follows:

         First:  To the payment of all costs and expenses  incurred by Sirrom in
connection  with any such sale,  including,  but not limited to, all court costs
and the  reasonable  fees and  expenses  of  counsel  for  Sirrom in  connection
therewith, and

         Second:  To the  payment in full of the  Obligations,  first to accrued
interest and thereafter to the unpaid  principal  amount thereof,  to the extent
not previously paid by Borrower, and





                                        3





         Third:  The  excess,  if any,  shall be paid to  Borrower  or any other
person lawfully thereunto entitled.

         7. Reimbursement of Lender.  Borrower agrees to reimburse Sirrom,  upon
demand,  for all expenses,  including without limitation  reasonable  attorney's
fees,  incurred by it in connection with the  administration  and enforcement of
this  Agreement,  and agrees to indemnify  Sirrom and hold it harmless  from and
against  any  and  all  liability  incurred  by it  hereunder  or in  connection
herewith,  unless such  liability  shall be due to willful  misconduct  or gross
negligence on the part of Sirrom.

         8. No  Waiver.  No failure  on the part of Sirrom to  exercise,  and no
delay in exercising,  any right,  power or remedy  hereunder  shall operate as a
waiver  thereof,  nor shall any single or partial  exercise  of any such  right,
power or remedy by Sirrom preclude any other or further  exercise thereof or the
exercise of any other right,  power or remedy.  All remedies are  cumulative and
are not exclusive of any other remedies provided by law.

         9.  Limitation  of  Lender  Liability.  Except  in the  case  of  their
intentional  malfeasance or gross  negligence,  neither Sirrom nor its partners,
employees,  agents,  representatives,  or nominees  shall be liable for any loss
incurred by Borrower arising out of any act or omission of Sirrom, its partners,
employees,  agents,  representatives  or  nominees,  with  respect  to the care,
custody or preservation of the Pledged Securities.

         10.  Binding  Agreement.  This  Agreement and the terms,  covenants and
conditions  hereof shall be binding upon and inure to the benefit of the parties
hereto and to all holders of  indebtedness  secured hereby and their  respective
successors and assigns.

         11. Governing Law; Amendments.  This Agreement shall in all respects be
construed in accordance  with and governed by the laws of the State of Tennessee
applicable to contracts to be wholly performed in such state. This Agreement may
not be amended or modified,  nor may any of the Pledged  Securities  be released
except in a writing signed by the party to be charged therewith.  Time is of the
essence with respect to the obligations of Borrower pursuant to this Agreement.

         12.  Further  Assurances.  Borrower  agrees to do such further acts and
things,  and to execute and deliver such  additional  conveyances,  assignments,
agreements and instruments, as Sirrom may at any time request in connection with
the  administration and enforcement of this Agreement or relative to the Pledged
Securities  or any part  thereof or in order to better  assure and confirm  unto
Sirrom its rights and remedies hereunder.

         13.  Headings.  Section  numbers  and  headings  used  herein  are  for
convenience  only and are not to affect the  construction of or to be taken into
consideration in interpreting this Agreement.





                                        4





         IN WITNESS  WHEREOF,  Borrower and Sirrom have executed this Agreement,
or have caused this Agreement to be duly executed by a duly authorized  officer,
all as of the day first above written.

                                            BORROWER:

                                            DYNAGEN, INC.,
                                            a Delaware corporation




                                            By:    /s/ Dhananjay G. Wadekar
                                                   ----------------------------
                                            Title: Executive Vice President
                                                   ----------------------------


                                            SIRROM:

                                            SIRROM   CAPITAL   CORPORATION,    a
                                            Tennessee  corporation,  for  itself
                                            and in its  capacity  as  Collateral
                                            Agent   pursuant   to   the   Agency
                                            Agreement




                                            By:    /s/ [Illegible]
                                                   ----------------------------
                                            Title: Vice President
                                                   ----------------------------




                                        5




                                   SCHEDULE A

                               PLEDGED SECURITIES




                            No. of
        Issuer              Shares      Class      Certificate Nos.
- -----------------------     ------     -------     ----------------



Superior Pharmaceutical      100       Common       11, 12 and 13
Company






                                        6



                                                                    EXHIBIT 4.11

         THIS NOTE HAS NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "ACT"),  OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE SOLD OR
OTHERWISE TRANSFERRED IN THE ABSENCE OF EFFECTIVE REGISTRATION  STATEMENTS UNDER
SUCH  ACT AND  STATE  SECURITIES  LAWS,  OR AN  OPINION  OF  COUNSEL  REASONABLY
ACCEPTABLE TO THE DEBTOR THAT SUCH REGISTRATION IS NOT REQUIRED.

                                  DYNAGEN, INC.

                                SUBORDINATED NOTE


$500,000.00                                                        JUNE 18, 1997


         FOR  VALUE  RECEIVED,   DYNAGEN,  INC.,  a  Delaware  corporation  (the
"DEBTOR"),  hereby promises to pay on or before September 30, 1997, to the order
of COUTTS & CO. AG, a Swiss  corporation  acting as agent for  certain  non-U.S.
persons (the  "LENDER"),  the  principal  sum of FIVE HUNDRED  THOUSAND  DOLLARS
($500,000.00) or such lesser principal  amount then  outstanding,  together with
all accrued and unpaid  interest  thereon.  Interest on the principal  amount of
this Note will accrue from and including the date hereof until and including the
date such principal  amount is paid, at a rate equal to seven percent (7.0%) per
annum.  Any interest due but  remaining  unpaid after  payment is due shall bear
interest at the rate equal to 10.0% per annum.  Principal and interest  shall be
payable  in  lawful  money of the  United  States  of  America,  in  immediately
available funds, at the principal office of the Lender or at such other place as
the legal  holder may  designate  from time to time in  writing  to the  Debtor.
Interest shall be computed on the basis of a 360-day year and a 30-day month.

         The principal and interest on this Note are secured by a certain Pledge
and Security  Agreement  among the Lender,  the Debtor and each of Dr. Indu Muni
and  Dhananjay  Wadekar as  pledgors  of certain  shares of Common  Stock of the
Debtor (the "Pledge Agreement").

         This Note is being issued in connection with a certain Bridge Financing
Purchase Agreement dated the date hereof.  The outstanding  balance of this Note
shall be immediately due and payable upon an Event of Default as defined in such
Bridge Financing Purchase  Agreement.  The Lender's sole and limited recourse in
the Event of a Default,  as defined in the Bridge Financing Purchase  Agreement,
is as to the  Collateral  as set forth in the Pledge  Agreement.  The Debtor may
prepay  this  Note at any time  prior to demand  for  payment,  acceleration  or
maturity.

         The Lender and any holder of this Note  acknowledge  and agree that the
principal  and interest on this Note are  unsecured by the Debtor and the rights
and obligations represented by this Note are subordinated in right of payment to
secured  indebtedness  of the Debtor for money  borrowed  from  commercial  bank
lenders or other institutional  lenders or other holders of Senior Debt, whether
now existing or hereafter  arising,  as further defined in the Bridge  Financing
Purchase Agreement.

         The Debtor  agrees to pay all costs,  charges and expenses  incurred by
the Lender (including, without limitation, costs of collection, court costs, and
reasonable  attorneys' fees and disbursements) in connection with the successful
enforcement of the Lender's rights under this Note (all such costs,  charges and
expenses being herein referred to as "COSTS").  The Debtor agrees that any delay
on the part of the Lender in exercising any rights hereunder will not operate as
a waiver of such rights, and further agrees



                                      -2-



that any payments  received  hereunder  will be applied first to Costs,  then to
interest and the balance to principal.  The Lender shall not by any act,  delay,
omission, or otherwise be deemed to waive any of its rights or remedies,  and no
waiver of any kind shall be valid  unless in writing  and signed by the  Lender.
Presentment  for  payment,  demand,  protest,  notice of  protest  and notice of
nonpayment  are hereby waived.  Irrespective  of any claim,  defense,  credit or
offset  Debtor may have  against  Lender,  these shall not  discharge  or modify
Debtor's absolute,  independent  obligation to repay Lender any sums advanced to
Debtor pursuant to this Note.

         This  Note  applies  to,  inures  to the  benefit  of,  and  binds  the
successors and assigns of the parties hereto.  This Note is made under and shall
be  governed by and  construed  in  accordance  with the  internal  laws of, and
enforced by the courts located within, the Commonwealth of Massachusetts.

         IN WITNESS WHEREOF,  the Debtor has executed this Note as an instrument
under seal as of the date first written above.

                                          DYNAGEN, INC.


                                          By:     /s/ Dhananjay G. Wadekar
                                                  --------------------------
                                          Title:  Executive Vice President
                                                  --------------------------


ATTEST:   /s/ Dennis R. Bilodeau
          --------------------------
Title:    Controller
          --------------------------



                                                                    EXHIBIT 4.12

                       BRIDGE FINANCING PURCHASE AGREEMENT

         BRIDGE FINANCING PURCHASE  AGREEMENT,  made as of June 16, 1997, by and
between  Coutts & Co.  AG, a Swiss  corporation,  acting  as agent  for  certain
non-U.S.  persons,  with a principal place of business at Talstrasse 59, Zurich,
CH-8022 (the  "INVESTOR")  and  DYNAGEN,  INC.,  a Delaware  corporation  with a
principal  place of business at 99 Erie Street,  Cambridge,  Massachusetts  (the
"COMPANY").

                              W I T N E S S E T H:

         WHEREAS,  the Investor desires to provide financing to the Company upon
the terms and conditions set forth herein;

         NOW,  THEREFORE,  in  consideration  of  the  respective  undertakings,
covenants and  agreements of the parties set forth  herein,  the parties  hereby
agree as follows:

         1. ISSUANCE OF NOTE AND SHARES OF COMMON  STOCK;  PLEDGE OF STOCK . The
Company has  authorized  the issuance and sale to the Investor of the  Company's
Subordinated Note, due September 30, 1997, in the original  aggregate  principal
amount of up to $1,0500,000. The Subordinated Note shall be substantially in the
form set forth in Exhibit A hereto and is herein  referred to as a "NOTE," which
term shall also include any notes delivered in exchange or replacement therefor.
The Note shall be due September 30, 1997, with interest payable upon maturity of
7% per annum.  The  Company has also  authorized  the  issuance  and sale to the
Investor of 30150,000  shares of the  Company's  Common Stock (the  "SHARES") in
connection with the making of the loan  represented by this Agreement.  The Note
and the Shares are sometimes referred to herein as the "SECURITIES."

         The  obligations  under the Note are  secured  by a pledge  of  600,000
shares of Common Stock of the Company by Dhananjay G. Wadekar and 400,000 shares
of Common  Stock of the  Company  by Dr.  Indu  Muni  pursuant  to a Pledge  and
Security Agreement attached hereto as Exhibit B.

         The Company  agrees to use the full  proceeds from the sale of the Note
and Shares solely for working  capital and for the  acquisition  of the business
and operations of Superior Pharmaceutical Company.

         2. THE CLOSING.  The Company  agrees to issue and sell to the Investor,
and, subject to and in reliance upon the representations,  warranties, terms and
conditions of this Agreement,  the Investor agrees to purchase, the Note and the
Shares for the aggregate  purchase price of $1,0500,000.  Such purchase and sale
shall take place at a closing (the "CLOSING") to be held at the office of Testa,
Hurwitz & Thibeault,  LLP, 125 High Street, Boston,  Massachusetts,  on June 10,
1997 at 2:00 P.M.,  or on such  other  date and at such time as may be  mutually
agreed upon. At the Closing,  the Company will issue and deliver to the Investor
(i) one Note,  payable to the order of the Investor,  in the principal amount of
up to $1,0500,000, and (ii) within, five (5) business days of the Closing, issue
one certificate for the Shares, registered in the name of such Investor, against



                                      -2-



delivery at the Closing of a check or a receipt of a wire transfer in payment of
the purchase price for the Note to be purchased by the Investor.

         3.   REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY.   The  Company
represents and warrants to the Investor as follows:

                  3.1 AUTHORIZATION; OWNERSHIP OF SECURITIES. This Agreement and
the Note and the Shares have been duly authorized by the Company. This Agreement
and the Note and the Shares, when executed and delivered by the Company, will be
valid and binding  obligations of the Company,  enforceable  in accordance  with
their  terms.  The Shares,  when issued and  delivered in  accordance  with this
Agreement,   will  be  duly   authorized,   validly   issued,   fully  paid  and
nonassessable,  and will not be subject to any liens or restrictions,  rights of
first refusal or other preemptive rights imposed by law or contract,  or through
the Company,  except  restrictions on transfer imposed by applicable  securities
laws.

                  3.2 ORGANIZATION,  GOOD STANDING AND AUTHORITY OF THE COMPANY.
The  Company is a  corporation  duly  organized,  validly  existing  and in good
standing  under the laws of the State of Delaware,  and has the requisite  power
and  authority  to own all of its  properties  and  assets  and to  carry on its
business  as it is now being  conducted.  The  Company is duly  qualified  to do
business and is in good standing in each jurisdiction in which it owns or leases
property  or engages in any  activity  which  would  require it to qualify to do
business as a foreign corporation and in which the failure to qualify could have
a material adverse effect upon the business or operations of the Company.

                  3.3  AUTHORIZATION.  The Company has full corporate  power and
authority  to  enter  into  this  Agreement  and to  carry  out its  obligations
hereunder.  The execution and delivery of this Agreement and the consummation of
the transactions  contemplated  hereby have been duly authorized by the Board of
Directors of the Company and no other  corporate  proceedings  or actions on the
part of the Company (including any consents or waivers required for the issuance
of  the   Securities)   are  necessary  to  authorize  this  Agreement  and  the
transactions  contemplated  hereby.  This  Agreement  constitutes  the valid and
binding  obligation of the Company,  enforceable  in accordance  with its terms,
except  as  enforcement  hereof  may  be  limited  by  bankruptcy,   insolvency,
moratorium  or other  similar  laws  relating  to or  affecting  the  rights  of
creditors  generally  and  subject  to the  fact  that  equitable  remedies  are
discretionary and may not be granted by a court of competent jurisdiction.

                  3.4 NO DEFAULT.  The  execution,  delivery and  performance of
this  Agreement  by the  Company  and the  consummation  by the  Company  of the
transactions  contemplated hereby do not and will not constitute a default under
any of the terms,  conditions or provisions of the Articles of  Organization  or
By-Laws of the Company,  or any material  contract,  agreement or arrangement to
which the Company is a party or by which it is bound.

                                      -3-


                  3.5 CAPITAL STOCK OF THE COMPANY.  As of the date hereof,  the
authorized  capital stock of the Company consists of 75,000,000 shares of Common
Stock $.01 par value per  share,  of which  30,122,477  shares  were  issued and
outstanding and 10,000,000  shares of preferred stock,  $.01 par value per share
of which no shares were issued and outstanding.  All of such outstanding  shares
have been  validly  issued  and are fully paid and  nonassessable.  No shares of
Common Stock are subject to preemptive rights or any other similar rights or any
liens or encumbrances suffered or permitted by the Company.  Except as disclosed
in the SEC Documents,  (i) there are no outstanding  options,  warrants,  scrip,
rights  to  subscribe  to,  calls or  commitments  of any  character  whatsoever
relating to, or securities or rights  convertible into or exchangeable  for, any
shares  of  capital  stock  of  the  Company  or any  of  its  subsidiaries,  or
arrangements  by which the Company or any of its  subsidiaries  is or may become
bound to issue  additional  shares of capital stock of the Company or any of its
subsidiaries,  and (ii) there are no outstanding  convertible debt securities of
the Company.  As of the Closing Date and before giving effect to the acquisition
of Superior  Pharmaceutical  Company by the Company pursuant to an Agreement and
Plan of Merger dated March 7, 1997, as amended (i) the authorized  capital stock
of the Company will be (x) 75,000,000 shares of Common Stock, $.01 par value per
share,  of which  30,347,477  shares  will be  issued  and  outstanding  and (y)
10,000,000  shares of Preferred  Stock,  $.01 par value per share,  of which (A)
50,000 shares have been designated Series A Preferred Stock, of which 41,000 are
issued and outstanding, and (B) 7,500 have been designated as Series B Preferred
Stock, all of which are issued and outstanding and (ii) the Company has reserved
for issuance no more than 11,000,000  shares of Common Stock with respect to the
matters described below in clause (i) of this Section.

                  3.6 COMPLIANCE WITH LAWS. To its best  knowledge,  the Company
holds all material licenses, approvals, certificates, permits and authorizations
necessary for the lawful  conduct of its business and is in material  compliance
with all  applicable  federal,  state and local  laws,  rules,  regulations  and
ordinances.

                  3.7 SEC DOCUMENTS. None of the filings of the Company with the
SEC since July 1, 1996 (the "SEC DOCUMENTS") contained, as of the time they were
filed,  any untrue statement of a material fact or omitted to state any material
fact required to be stated therein or necessary to make the statements  therein,
in light of the  circumstances  under which they were made, not misleading.  The
Company has since July 1, 1996 timely  filed all  requisite  forms,  reports and
exhibits thereto with the SEC. As of their  respective  dates, the SEC Documents
complied in all material  respects with the requirements of the Exchange Act and
the rules and  regulations of the SEC promulgated  thereunder  applicable to the
SEC  Documents.  Prior  to the  date  hereof,  the  Company  has  corrected  all
statements in the SEC Documents which have required correction and has filed all
necessary  amendments  to the  SEC  Documents,  in  each  case  as  required  by
applicable law.

         The Company has  registered its Common Stock pursuant to the Securities
Exchange Act of 1934 (the  "EXCHANGE  ACT"),  and the Common Stock is listed and
currently trades on the NASDAQ SmallCap Market.  The Company is not in violation
of the  applicable  listing  agreement  between the  Company and any  securities
exchange or market on which the Company's securities are listed. The Company has
timely  filed all  materials  required  to be filed  pursuant  to all  reporting




                                      -4-


obligations under either Section 13(a) or 15(d) of the Exchange Act for at least
twelve (12) months  immediately  preceding the date hereof,  and has received no
notice,  either oral or written,  with respect to the continued  eligibility for
such  listing.  The  Company  has timely  made all  filings  required  under the
Exchange  Act during the twelve month  period  preceding  the date hereof and is
eligible to use Form S-3 to register the Shares.  As of their respective  dates,
the financial  statements of the Company included in the SEC Documents  complied
as to form in all material respects with applicable accounting  requirements and
the  published  rules and  regulations  of the SEC with  respect  thereto.  Such
financial  statements have been prepared in accordance  with generally  accepted
accounting principles,  consistently applied during the periods involved (except
(i) as may be otherwise  indicated  in such  financial  statements  or the notes
thereto, or (ii) in the case of unaudited interim statements, to the extent they
may exclude  footnotes  or may be condensed  or summary  statements)  and fairly
present in all material respects the financial position of the Company as of the
dates thereof and the results of its  operations  and cash flows for the periods
then ended  (subject,  in the case of unaudited  statements,  to normal year-end
audit  adjustments).  Prior to the date hereof,  the Company has  corrected  all
statements in the SEC Documents which have required correction and has filed all
necessary  amendments  to the  SEC  Documents,  in  each  case  as  required  by
applicable law.

         3.8 LITIGATION.  Except as set forth in the SEC Documents,  there is no
action, suit,  proceeding at law or in equity,  arbitration or administrative or
other proceeding by or before (or to the best knowledge,  information and belief
of the Company any investigation  by) any governmental or other  instrumentality
or agency,  pending,  or, to the best  knowledge,  information and belief of the
Company,  threatened against or affecting the Company,  or any of its properties
or rights which could  materially  and adversely  affect the right or ability of
the Company to carry on its business as now conducted, or which could materially
and  adversely  affect  the  condition,   whether  financial  or  otherwise,  or
properties of the Company;  and the Company does not know of any valid basis for
any such action,  proceeding  or  investigation.  Except as set forth in the SEC
Documents,  the Company is not subject to any judgment,  order or decree entered
in any lawsuit or proceeding  which may have a material adverse effect on any of
its operations, or on its ability to acquire any property or conduct business in
any area.

         3.9  INTELLECTUAL  PROPERTY;  PROPRIETARY  RIGHTS.  Except as set forth
within this Agreement or in the SEC Documents,  the Company and its subsidiaries
own, have obtained or possess rights to use the trademarks, trade names, service
marks, service mark registrations,  patents,  copyrights,  licenses,  approvals,
governmental authorizations, trade secrets and other rights necessary to conduct
their  respective  businesses  as now  conducted,  the Company does not have any
knowledge of any material infringement by the Company or its subsidiaries of any
trademark,  trade name rights,  patent  rights,  copyrights,  licenses,  service
marks,  service mark  registrations,  trade secrets or other  similar  rights of
others, and there is no claim being made against the Company or its subsidiaries
regarding  trademark,  trade name, patent,  copyright,  license,  service marks,
service mark registrations,  trade secret or other infringement which could have
a material adverse effect on the Company.  The Company and its subsidiaries have
taken reasonable  security measures to protect the secrecy,  confidentiality and
value of all of their intellectual properties.



                                      -5-


         4.  REPRESENTATIONS  AND  WARRANTIES  OF  THE  INVESTOR.  The  Investor
represents and warrants to the Company as follows:

                  4.1  INVESTMENT.  The Investor is acquiring the Securities for
its own account,  for investment purposes only, and not with a view to the sale,
assignment, transfer or other distribution thereof. The Investor recognizes that
the Securities,  have not been  registered  under the Securities Act of 1933, as
amended (the  "SECURITIES  ACT"), and the Investor agrees that it will not sell,
assign,  transfer,  or otherwise  distribute  the Securities in violation of the
Securities Act.

                  4.2   INVESTIGATION.   The  Investor  is   knowledgeable   and
experienced  in the  making of  investments,  is aware  that the  Company  is an
early-stage company and therefore  speculative  investment,  is able to bear the
economic  risk of loss of its  investment  in the Company,  has been granted the
opportunity to make a thorough  investigation of the affairs of the Company, and
has availed itself of such opportunity either directly or through its authorized
representatives.  The foregoing representation shall not be construed in any way
so as to limit, define or in any way affect the Company's liability arising from
the warranties and representations of the Company in this or any other agreement
with the Investor or any affiliate of the Investor.

                  4.3   RELIANCE.   The  Investor  has  been  advised  that  the
Securities have not been and are not being  registered  under the Securities Act
or under the "blue sky" laws of any jurisdiction and that the Company in issuing
the  Securities is relying upon,  among other things,  the  representations  and
warranties of the Investor  contained in this Section 4 in concluding  that such
issuance  is a  "private  offering"  and does not  require  compliance  with the
registration provisions of the Securities Act.

                  4.4  LEGENDS.  The Investor  understands  and agrees that each
instrument representing the Securities delivered to the Investor hereunder shall
bear legends substantially as follows:

                  "The  Securities  represented  hereby have not been registered
                  under the Securities  Act of 1933, as amended,  and may not be
                  sold or transferred unless the registration provisions of said
                  Act have  been  complied  with or  unless  in the  opinion  of
                  counsel  satisfactory  to the  Company  both as to opinion and
                  counsel compliance with such provisions is not required."

         5. REGISTRATION RIGHTS.

                  5.1  "PIGGY-BACK"  REGISTRATIONS.  If at any time the  Company
shall  determine to register for its own account under the Securities Act any of
its equity securities,  it shall send to the Investor as a holder of Registrable
Securities  (as  defined  below)  and any  holder  who has the right to  acquire
Registrable  Securities,  written  notice of such  determination  and, if within
twenty (20) days after  receipt of such notice,  such holder shall so request in
writing,  the Company  shall include in such  registration  statement all or any
part of the  Registrable  Securities  such  holder  requests  to be  registered.
"REGISTRABLE  SECURITIES"  shall consist of any and all of the Shares held by an
Investor.


                                      -6-


                  If, in connection with any offering  involving an underwriting
of Common Stock to be issued by the  Company,  the  managing  underwriter  shall
impose a limitation  on the number of  Securities of such Common Stock which may
be  included  in the  registration  statement  because,  in its  judgment,  such
limitation  is  necessary  to effect an orderly  public  distribution,  then the
Company shall be obligated to include in such  registration  statement only such
limited portion of the Registrable  Securities with respect to which such holder
has requested inclusion hereunder; provided, however, that the Company shall not
so  exclude  any  Registrable  Securities  unless  it  has  first  excluded  any
securities  to be offered and sold by officers and  employees of the Company and
by holders who do not have  contractual  rights as of the date hereof to include
such securities in any registration unless the holders obtained such contractual
rights  pursuant to equity  financings  consummated  by the Company  immediately
following the date hereof relating to the acquisition of Superior Pharmaceutical
Company and the creation of working capital for the business of the Company.

                  No incidental  right under this Section 5.1 shall be construed
to limit any registration required under Section 5.2.

                  This  Section  5.1  shall  not  apply  to  a  registration  of
Securities  of Common  Stock on Form S-8 or Form S-4 or their  then  equivalents
relating to an offering of Common Stock to be issued solely in  connection  with
any  acquisition  of any entity or business or otherwise  issuable in connection
with any stock option, stock purchase or similar employee benefit plan.

                  5.2. SHORT-FORM  REGISTRATIONS ON FORM S-3. In addition to the
rights  provided the holder of Registrable  Securities in Sections 5.1 above, if
the  registration  of  Registrable  Securities  under the  Securities Act can be
effected on a Form S-3  registration  form (or any similar  form having  similar
requirements  promulgated by the Commission),  then the Company shall,  upon the
written  request of the Investor  and as  expeditiously  as possible  (but in no
event  later than  ninety  (90) days from the date of the  Investor's  request),
effect  qualification  and registration  under the Securities Act on Form S-3 of
all or  such  portion  of the  Registrable  Securities  as each  Investor  shall
specify.

                  The Company  shall not be required to effect more than two (2)
registrations  in the  aggregate  pursuant to this Section 5.2 and not more than
one during any twelve-month period. The Company's obligations under this Section
5.2 shall expire five (5) years after the issuance of the Shares by the Company.
Any offering of  Registrable  Securities  pursuant to this Section  shall have a
minimum market value to the public  (valued at the public  offering price of the
Company's Securities as of the effective date of the registration  statement for
such offering) of at least $200,000 of the securities so registered.

                  5.3. EXPENSES. In the case of each registration effected under
Section 5.1 or 5.2, the Company shall bear all reasonable  costs and expenses of
each  such  registration  on  behalf  of  the  selling  holders  of  Registrable
Securities   (except  as  otherwise   prohibited  by  state  securities  law  or
regulation),  including,  but not limited to, the Company's printing,  legal and
accounting  fees and expenses,  SEC and NASD filing fees and "Blue Sky" fees and
expenses and the reasonable fees and  disbursements of one counsel  competent in
securities  matters  for  the  selling  holders  of  Registrable  Securities  in
connection with the  registration  of their  Registrable  Securities;  provided,



                                      -7-



however,  that the Company shall have no obligation to pay or otherwise bear any
portion  of the  underwriters'  commissions  or  discounts  attributable  to the
Registrable  Securities  being  offered and sold by the  holders of  Registrable
Securities,  or the fees and  expenses  of counsel  for the  selling  holders of
Registrable  Securities in connection  with the  registration of the Registrable
Securities.  The Company shall pay all expenses (including reasonable attorneys'
fees subject to the limitations set forth  immediately  above) of the holders of
the  Registrable  Securities  in  connection  with  any  registration  initiated
pursuant to this Section 5 which is withdrawn, delayed or abandoned.

         6. SUBORDINATION.  The Company, for itself, its successors and assigns,
covenants and agrees,  and the Investor and each successor holder of the Note by
his  or  its   acceptance   thereof,   likewise   covenants  and  agrees,   that
notwithstanding  any other  provision of this Agreement or the Note, the payment
of the principal of and interest on the Note shall be  subordinated  in right of
payment,  to the extent and in the manner  hereinafter  set forth,  to the prior
payment  in full  of all  Senior  Debt  (as  hereinafter  defined)  at any  time
outstanding.  The  provisions  of this  Section  shall  constitute  a continuing
representation to all persons who, in reliance upon such provisions,  become the
holders of or continue to hold Senior Debt, and such provisions are made for the
benefit of the holders of Senior Debt, and such holders are hereby made obligees
hereunder  the same as if their names were written  herein as such,  and they or
any of them may  proceed to  enforce  such  provisions  against  the  Company or
against the holder of the Note without the necessity of joining the Company as a
party.

                  (A) PAYMENT OF SENIOR DEBT. In the event of any  insolvency or
bankruptcy  proceedings,  or any  receivership,  liquidation,  reorganization or
other similar proceedings in connection therewith, relative to the Company or to
its property,  or, in the event of any  proceedings  for voluntary  liquidation,
dissolution or other winding up of the Company or  distribution or marshaling of
its assets or any  composition  with  creditors of the  Company,  whether or not
involving  insolvency or bankruptcy,  then and in any such event all Senior Debt
shall be paid in full  before any  payment  or  distribution  of any  character,
whether in cash,  securities or other property,  shall be made on account of the
Note;  and any  such  payment  or  distribution,  except  securities  which  are
subordinated  and junior in right of payment to the  payment of all Senior  Debt
then outstanding in terms of substantially the same tenor as this Section, which
would,  but for the provisions  hereof,  be payable or deliverable in respect of
the Note shall be paid or  delivered  directly to the holders of Senior Debt (or
their duly  authorized  representatives),  in the proportions in which they hold
the same,  until all Senior Debt shall have been paid in full, and the holder of
the Note by becoming a holder  thereof shall have  designated  and appointed the
holder or holders of Senior Debt (and their duly authorized  representatives) as
his or its agents and  attorney-in-fact  to demand, sue for, collect and receive
such Senior Debt holder's  ratable share of all such payments and  distributions
and to file any  necessary  proof of claim  therefor  and to take all such other
action in the name of the holder of the Note or  otherwise,  as such Senior Debt
holders (or their authorized  representatives)  may determine to be necessary or
appropriate for the enforcement of this Section. The Investor and each successor
holder of the Note by its acceptance  thereof agrees to execute,  at the request
of the Company, a separate agreement with any holder of Senior Debt on the terms
set forth in this  Section,  and to take all such other action


                                      -8-



as such holder or such  holder's  representative  may request in order to enable
such holder to enforce all claims  upon or in respect of such  holder's  ratable
share of the Note.

                  (B) NO PAYMENT ON THE NOTE UNDER  CERTAIN  CONDITIONS.  In the
event that any default  occurs in the payment of the principal of or interest on
any Senior Debt (whether as a result of the acceleration  thereof by the holders
of such Senior Debt or otherwise) and during the continuance of such default for
a period up to ninety (90) days and  thereafter  if judicial  proceedings  shall
have been  instituted with respect to such defaulted  payment,  or (if a shorter
period)  until  such  payment  has been made or such  default  has been cured or
waived in writing by such holder of Senior Debt then and during the  continuance
of such event no payment of  principal  or interest on the Note shall be made by
the Company or accepted by any holder of the Note who has  received  notice from
the Company or from a holder of Senior Debt of such events.

                  (C) SCOPE OF  SECTION.  The  provisions  of this  Section  are
intended solely for the purpose of defining the relative rights of the holder of
the Note,  on the one hand,  and the  holders of the Senior  Debt,  on the other
hand.  Nothing  contained in this Section or elsewhere in this  Agreement or the
Note is intended to or shall impair, as between the Company, its creditors other
than the holders of Senior Debt,  and the holder of the Note,  the obligation of
the Company,  which is unconditional  and absolute,  to pay to the holder of the
Note the principal of and interest on the Note as and when the same shall become
due and payable in accordance with the terms thereof,  or to affect the relative
rights of the holder of the Note and  creditors  of the  Company  other than the
holders of the Senior Debt,  nor shall  anything  herein or therein  prevent the
holder of the Note from  accepting  any  payment  with  respect  to such Note or
exercising all remedies otherwise permitted by applicable law upon default under
such Note,  subject to the rights,  if any, under this Section of the holders of
Senior Debt in respect of cash,  property or securities of the Company  received
by the holder of the Note.

                  (D)  SURVIVAL  OF RIGHTS.  The right of any  present or future
holder of Senior  Debt to  enforce  subordination  of the Note  pursuant  to the
provisions  of this Section  shall not at any time be  prejudiced or impaired by
any act or  failure  to act on the part of the  Company  or any such  holder  of
Senior Debt, including,  without limitation,  any forbearance,  waiver, consent,
compromise,  amendment,  extension, renewal, or taking or release of security of
or in respect of any Senior Debt or by  noncompliance  by the  Company  with the
terms of such subordination  regardless of any knowledge thereof such holder may
have or otherwise be charged with.

                  (E) SENIOR DEBT DEFINED. The term "Senior Debt" shall mean all
Indebtedness of the Company for money borrowed from banks or other institutional
lenders, including any extension or renewals thereof, whether outstanding on the
date  hereof  or  thereafter  created  or  incurred,  which is not by its  terms
subordinate  and junior to or on a parity  with the Note and which is  permitted
hereby at the time it is created  or  incurred,  including  Sirrom  Capital  and
Odyssey Investment Partners L.P.

         7.  EVENTS OF  DEFAULT.  If any of the  following  events  ("EVENTS  OF
DEFAULT") shall occur and be continuing, then there shall be a default under the
Note:



                                      -9-



                  (a) The Company shall fail to pay any installment of principal
of or interest or premium on the Note upon maturity; or

                  (b) Any representation or warranty made by the Company in this
Agreement shall prove to have been incorrect when made in any material  respect;
or

                  (c) The Company shall be involved in financial difficulties as
evidenced  (i) by its  admitting  in  writing  its  inability  to pay its  debts
generally as they become due; (ii) by its commencement of a voluntary case under
Title 11 of the United  States  Code as from time to time in  effect,  or by its
authorizing,  by  appropriate  proceedings  of its Board of  Directors  or other
governing body, the  commencement of such a voluntary case;  (iii) by its filing
an  answer  or  other  pleading  admitting  or  failing  to  deny  the  material
allegations of a petition filed against it commencing an involuntary  case under
said Title 11, or seeking,  consenting to or  acquiescing  in the relief therein
provided, or by its failing to controvert timely the material allegations of any
such petition;  (iv) by the entry of an order for relief in any involuntary case
commenced  under said Title 11; (v) by its seeking  relief as a debtor under any
applicable  law, other than said Title 11, of any  jurisdiction  relating to the
liquidation or reorganization of debtors or to the modification or alteration of
the rights of creditors,  or by its consenting to or acquiescing in such relief;
(vi) by the entry of an order by a court of competent  jurisdiction  (a) finding
it to be bankrupt or  insolvent,  (b)  ordering or  approving  its  liquidation,
reorganization or any modification or alteration of the rights of its creditors,
or (c) assuming custody of, or appointing a receiver or other custodian for, all
or a substantial part of its property;  or (vii) by its making an assignment for
the  benefit  of,  or  entering  into a  composition  with,  its  creditors,  or
appointing or consenting to the appointment of a receiver or other custodian for
all or a substantial part of its property; or

                  (d) The Company  shall fail to effect a  registration  on Form
S-3 under Section 5.2 within 120 days of the Investor's request for registration
under the Securities Act.

                  Upon  the  occurrence  of an  Event  of  Default  which is not
remedied,  the Investor's  sole and limited  recourse is to proceed  against the
Collateral  described in the Pledge and Security  Agreement.  The Investor shall
have no recourse against the Company upon an Event of Default.

         8. AMENDMENT. This Agreement may not be modified or amended except by a
written  instrument  duly executed and delivered by or on behalf of the Investor
and the Company.

         9. BINDING EFFECT.  This Agreement shall be binding on and inure to the
benefit of the parties hereto and their respective successors and assigns.

         10. COUNTERPARTS.  This Agreement may be executed simultaneously in two
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         11.  GOVERNING  LAW.  This  Agreement  and the  respective  rights  and
obligations  of the  parties  hereto  shall  be  governed  by and  construed  in
accordance with the laws of the  Commonwealth of  Massachusetts,  without giving
effect to principles of conflicts of laws.



                                      -9-


                  IN WITNESS WHEREOF, the Company and the Investor have executed
this Bridge Financing  Purchase  Agreement as an instrument under seal as of the
date first set forth above.

                                  DYNAGEN, INC.


                                  By:      /s/ Indu A. Muni
                                           -----------------------------
                                           President


COUTTS & CO. AG
ACTING AS AGENT FOR CERTAIN NON-U.S. PERSONS


/s/ [Illegible]
- ------------------------------------  
By:
Title:   Senior Vice President


/s/ [Illegible]
- ------------------------------------  
By:
Title:   Senior Vice President





                                                                    EXHIBIT 4.13



                                  DYNAGEN, INC.

                    CERTIFICATE OF DESIGNATIONS, PREFERENCES

                     AND RIGHTS OF SERIES A PREFERRED STOCK


         The undersigned officer of DynaGen,  Inc., a corporation  organized and
existing under the General Corporation Law of the State of Delaware, does hereby
certify  that,   pursuant  to  authority   conferred  by  the   Certificate   of
Incorporation, as amended to date, and pursuant to the provisions of Section 151
of the General Corporation Law of the State of Delaware,  the Board of Directors
of DynaGen,  Inc., on June 16, 1997, adopted a resolution  providing for certain
powers, designations, preferences and relative, participating, optional or other
rights, and the qualifications,  limitations or restrictions thereof, of certain
shares of Series A Preferred Stock,  $.01 par value, of the  Corporation,  which
resolution is as follows:

         RESOLVED:  That,  pursuant  to the  authority  vested  in the  Board of
Directors of the Corporation and in accordance with the General  Corporation Law
of the State of Delaware and the provisions of the Corporation's  Certificate of
Incorporation,  a series of 50,000 shares of the class of  authorized  Preferred
Stock,  par value $.01 per share,  of the  Corporation  is hereby created as the
Series A Preferred  Stock, and that the designation and number of shares thereof
and the voting powers,  preferences  and relative,  participating,  optional and
other  special  rights of the  shares of such  series,  and the  qualifications,
limitations  and  restrictions  thereof,  are as set forth on Exhibit A attached
hereto.

         EXECUTED as of this 16th day of June, 1997.


                                            DYNAGEN, INC.


                                            By:     /s/ Dhananjay G. Wadekar
                                                    ---------------------------
                                                    Dhananjay G. Wadekar,
                                                    Executive Vice President and
                                                    Chairman of the Board

ATTEST:


/s/ Kenneth J. Gordon
- ---------------------
Kenneth J. Gordon
Assistant Secretary







                                    EXHIBIT A
                                    ---------


A.       DESCRIPTION AND DESIGNATION OF SERIES A PREFERRED STOCK
         -------------------------------------------------------

         1.       DESIGNATION AND DEFINITIONS.
                  ---------------------------

                  (A) DESIGNATION. A total of 50,000 shares of the Corporation's
previously  undesignated Preferred Stock, $.01 par value, shall be designated as
the "Series A Preferred Stock." The original issue price per share of the Series
A Preferred Stock shall be $100.00 (the "ORIGINAL ISSUE PRICE").

                  (b) CERTAIN DEFINITIONS.  As used herein, the following terms,
unless the context otherwise requires, have the following respective meanings:

                           (i) "AVERAGE  QUOTED  PRICE" means the average of the
closing  bid price of the Common  Stock of the  Corporation  as  reported by the
Nasdaq SmallCap Market or Nasdaq National Market or, if the Corporation's Common
Stock is no longer traded on a Nasdaq  market,  such other exchange on which the
Corporation's  Common  Stock  is then  traded,  for the five  (5)  trading  days
immediately  preceding any holder's Conversion Date or Mandatory Conversion Date
(as defined in Section 5(c) below), as the case may be.

                           (ii)  "CONVERSION  DATE" means each date on which the
Corporation  receives by telecopy written notice in accordance with Section 5(j)
hereof  from a holder of Series A  Preferred  Stock that such  holder  elects to
convert shares of its Series A Preferred Stock.

                           (iii) "CORPORATION FAILURE" means the failure to have
the Registration  Statement  declared effective by the SEC other than due to the
material failure, whether by act or omission, by a holder or holders of Series A
Preferred  Stock to  fulfill  its or their  obligations  under the  Registration
Rights  Agreement  between the  Corporation  and the initial  purchasers  of the
Series A Preferred Stock (the "Registration Rights Agreement").

                           (iv)  "Effective  Price"  means  the  average  of the
closing  bid price of the Common  Stock of the  Corporation  as  reported by the
Nasdaq SmallCap Market or Nasdaq National Market or, if the Corporation's Common
Stock is no longer traded on a Nasdaq  market,  such other exchange on which the
Corporation's  Common  Stock  is then  traded,  for the five  (5)  trading  days
immediately  preceding  the  date  on  which  the  SEC  declares  effective  the
Registration Statement.

                           (v) "ISSUE DATE" means, with respect to each share of
Series A Preferred  Stock held by any holder,  the date on which the Corporation
originally  issued such share to such  holder  (irrespective  of any  subsequent
transfer or other disposition of such share to any other holder).






                                      -2-


                           (vi) "REGISTRATION  STATEMENT" means the registration
statement to be filed by the  Corporation  under the  Securities Act of 1933, as
amended,  to register the shares of Common Stock issuable upon conversion of the
Series A Preferred Stock in accordance with the terms of the Registration Rights
Agreement.

                           (vii) "SEC" means the United  States  Securities  and
Exchange Commission.

         2.       DIVIDENDS.

                  (A)  STATED  DIVIDEND.   Commencing  on  the  Issue  Date  and
continuing  thereafter,  a dividend will accrue quarterly in arrears at the rate
of five dollars  ($5.00) per annum (the "STATED  DIVIDEND") with respect to each
issued  share of  Series A  Preferred  Stock and  shall be  payable  on the last
trading day of each fiscal quarter of the Corporation. Stated Dividends shall be
cumulative  and shall be  payable  upon  conversion,  whether  or not  earned or
declared.

                  (B) PAYMENT UPON  CONVERSION.  On the date on which any holder
of Series A Preferred  Stock  converts any of its Series A Preferred  Stock into
Common  Stock,  the  accrued  Stated  Dividend  with  respect  to the  shares so
converted shall be paid to such holder.  All accrued Stated Dividends also shall
be payable upon the liquidation, dissolution or winding up of the Corporation.

                  (C)  PAYMENT IN COMMON  STOCK.  The  Corporation,  at its sole
discretion, may pay the Stated Dividends in cash or in shares of Common Stock at
the then fair market value per share of Common Stock as of the date on which the
Stated  Dividend is payable.  For purposes of this paragraph  2(c),  fair market
value shall be the  average of the closing bid price of the Common  Stock of the
Corporation as reported by the Nasdaq  SmallCap Market or Nasdaq National Market
or, if the  Corporation's  Common Stock is no longer traded on a Nasdaq  market,
such other exchange on which the Corporation's  Common Stock is then traded, for
the five (5) trading  days  immediately  preceding  the date on which the Stated
Dividend is payable.

                  (D) FRACTIONAL SHARES.  Notwithstanding anything herein to the
contrary,  no fractional  shares shall be issued pursuant to this Section 2, and
the  number of shares of Common  Stock  issued  upon the  payment  of the Stated
Dividend shall be rounded to the nearest whole share.

                  (E)  DECLARED  DIVIDENDS.  If the  Board  of  Directors  shall
declare a cash dividend payable upon the then outstanding shares of Common Stock
(other than a stock dividend on the Common Stock distributed  solely in the form
of  additional  shares of Common  Stock),  the holders of the Series A Preferred
Stock  shall be entitled  to the amount of  dividends  on the Series A Preferred
Stock as would be  declared  payable on the  largest  number of whole  shares of
Common  Stock  into which the  shares of Series A  Preferred  Stock held by each
holder  thereof  could be  converted  pursuant  to the  provisions  of Section 5
hereof,  such number  determined as of the record date for the  determination of
holders of Common Stock entitled to receive such dividend. Such determination of
"whole  shares" shall be based upon the  aggregate  number of 







                                      -3-

shares of Series A Preferred Stock held by each holder,  and not upon each share
of Series A Preferred Stock so held by the holder.

         3.       LIQUIDATION, DISSOLUTION OR WINDING UP.

                  (A) TREATMENT AT  LIQUIDATION,  DISSOLUTION  OR WINDING UP. In
the event of any  liquidation,  dissolution  or winding  up of the  Corporation,
whether voluntary or involuntary, or in the event of its insolvency,  before any
distribution  or  payment is made to any  holders  of Common  Stock or any other
class or series of capital stock of the  Corporation  designated to be junior to
the  Series A  Preferred  Stock,  and  subject  to the  liquidation  rights  and
preferences of any class or series of Preferred Stock designated by the Board of
Directors  in the  future to be  senior  to,  or on a parity  with the  Series A
Preferred  Stock with respect to  liquidation  preferences,  the holders of each
share of Series A Preferred  Stock shall be entitled to be paid first out of the
assets  of  the  Corporation  available  for  distribution  to  holders  of  the
Corporation's  capital  stock of all  classes,  whether such assets are capital,
surplus or earnings,  an amount  equal to the Original  Issue Price per share of
Series A Preferred Stock held by any holder,  plus the Stated Dividend  accruing
to the Series A Preferred  Stock  pursuant to Section 2 above (the  "LIQUIDATION
VALUE").

                  If,  upon  liquidation,  dissolution  or  winding  up  of  the
Corporation,  the assets of the  Corporation  available for  distribution to its
stockholders  shall be insufficient to pay the holders of the Series A Preferred
Stock the full amount to which they otherwise would be entitled,  the holders of
Series A Preferred  Stock shall share ratably in any  distribution  of available
assets pro rata in proportion to the respective  liquidation  preference amounts
which  would  otherwise  be  payable  upon   liquidation  with  respect  to  the
outstanding shares of the Series A Preferred Stock if all liquidation preference
amounts with respect to such shares were paid in full,  based upon the aggregate
Liquidation  Value  payable  upon all  shares of Series A  Preferred  Stock then
outstanding.

                  After such payment shall have been made in full to the holders
of the Series A Preferred  Stock, or funds necessary for such payment shall have
been set aside by the  Corporation  in trust for the  account  of holders of the
Series A Preferred  Stock so as to be available for such payment,  the remaining
assets available for distribution shall be distributed ratably among the holders
of the Common Stock and any class or series of capital  stock  designated  to be
junior to the Series A  Preferred  Stock (if any) in right of  payment  upon any
liquidation, dissolution or winding up of the Corporation.

                  The  amounts  set forth  above  shall be subject to  equitable
adjustment  by the  Board  of  Directors  whenever  there  shall  occur  a stock
dividend,   stock   split,   combination,   reorganization,    recapitalization,
reclassification  or other  similar  event  involving  a change  in the  capital
structure of the Common Stock or Series A Preferred Stock.

                  (B) DISTRIBUTIONS  OTHER THAN CASH. Whenever the distributions
provided for in this Section shall be payable in property  other than cash,  the
value of such  distribution  shall be the fair market value of such  property as
determined in good faith by the Board of Directors. All 








                                      -4-

distributions  (including distributions other than cash) made hereunder shall be
made pro rata to the holders of Series A Preferred Stock.

         4.       VOTING POWER.

                  (A) GENERAL.  Except as otherwise  expressly  provided in this
Section 4 or as otherwise  required by the General  Corporation Law of the State
of Delaware,  each holder of Series A Preferred  Stock shall be entitled to vote
on all  matters  and shall be  entitled  to that  number  of votes  equal to the
largest  number of whole shares of Common Stock into which such holder's  shares
of Series A Preferred  Stock could be converted,  pursuant to the  provisions of
Section 5 hereof,  at the  record  date for the  determination  of  stockholders
entitled to vote on any matter or, if no such record date is established, at the
date such vote is taken or any written  consent of  stockholders  is  solicited.
Except as otherwise required by law, the holders of shares of Series A Preferred
Stock and Common Stock shall vote together (or render  written  consents in lieu
of a vote) as a single class on all matters submitted to the stockholders of the
Corporation.

                  Such  determination  of "whole shares" shall be based upon the
aggregate number of shares of Series A Preferred Stock held by each holder,  and
not upon each share of Series A Preferred Stock so held by the holder.

                  (B) AMENDMENTS TO CHARTER. For so long as there are any shares
of Series A Preferred Stock  outstanding,  the  Corporation  shall not amend its
Certificate of  Incorporation  or this  Certificate  of Designation  without the
approval,  by vote or written consent,  of the holders of at least a majority of
the then outstanding  shares of Series A Preferred  Stock,  voting together as a
class, each share of Series A Preferred Stock to be entitled to one vote in each
instance,  if such amendment would adversely affect the rights of the holders of
Series A Preferred Stock.

         5.       CONVERSION RIGHTS.

                  (A) OPTIONAL CONVERSION. No shares of Series A Preferred Stock
held by any holder shall be convertible by such holder prior to ninety (90) days
after the Issue Date to such holder.  Beginning ninety (90) days after the Issue
Date to such holder, each such holder of Series A Preferred Stock shall have the
right,  at such  holder's  option,  to convert  during any five (5)  trading day
period up to twenty percent (20%) of the shares of Series A Preferred Stock held
by such holder into such number of fully paid and nonassessable shares of Common
Stock as shall be  determined  by  multiplying  the number of shares of Series A
Preferred  Stock to be  converted by a fraction,  the  numerator of which is the
Original Issue Price, and the denominator of which is the applicable  Conversion
Price (as defined below).

                  (B)  CONVERSION  PRICE.  The  conversion  price per share (the
"CONVERSION  PRICE")  shall be equal to the lesser of  subsections  (i) and (ii)
below.

                           (i)  One  hundred   twenty   percent  (120%)  of  the
Effective Price.







                                      -5-

                           (ii) (A)  Beginning  on the 90th day  after the Issue
Date and ending on the 120th day after the Issue Date,  eighty  percent (80%) of
the Average Quoted Price,  unless the SEC shall not have declared  effective the
Registration  Statement as of such Conversion Date due to a Corporation Failure,
in which case such percentage shall be seventy-eight percent (78%);

                                (B)  Beginning  on the 121st day after the Issue
Date and ending on the 150th day after the Issue Date,  eighty  percent (80%) of
the Average Quoted Price,  unless the SEC shall not have declared  effective the
Registration  Statement as of such Conversion Date due to a Corporation Failure,
in which case such percentage shall be seventy-six percent (76%);

                                (C)  Beginning  on the 151st day after the Issue
Date and  ending on the 180th day after the Issue  Date,  seventy-eight  percent
(78%) of the  Average  Quoted  Price,  unless  the SEC shall  not have  declared
effective  the  Registration  Statement  as of  such  Conversion  Date  due to a
Corporation  Failure, in which case such percentage shall be seventy-two percent
(72%);

                                (D)  Beginning  on the 181st day after the Issue
Date and  ending on the 210th day after the Issue  Date,  seventy-eight  percent
(78%) of the  Average  Quoted  Price,  unless  the SEC shall  not have  declared
effective  the  Registration  Statement  as of  such  Conversion  Date  due to a
Corporation  Failure,  in which case such  percentage  shall be seventy  percent
(70%);

                                (E)  Beginning  on the 211th day after the Issue
Date and ending on the 365th day after the Issue Date, seventy-six percent (76%)
of the Average  Quoted Price,  unless the SEC shall not have declared  effective
the  Registration  Statement  as of such  Conversion  Date due to a  Corporation
Failure, in which case such percentage shall be sixty-six percent (66%); and

                                (F)  Beginning  on the 366th day after the Issue
Date and ending on the second anniversary of the Issue Date,  seventy-four (74%)
of the Average  Quoted Price,  unless the SEC shall not have declared  effective
the  Registration  Statement as of such Conversion Date or Mandatory  Conversion
Date,  as the case may be,  due to a  Corporation  Failure,  in which  case such
percentage shall be sixty-four (64%).

                  (C)  MANDATORY  CONVERSION.  On the date that is two (2) years
from the Issue Date for each holder of Series A Preferred  Stock (the "MANDATORY
CONVERSION  DATE"), all shares of the Series A Preferred Stock then held by such
holder shall,  without any action on the part of such holder,  be  automatically
converted  into such  number of fully  paid and  nonassessable  shares of Common
Stock as shall be  determined  by  multiplying  the number of shares of Series A
Preferred  Stock then held by such holder by a fraction,  the numerator of which
is the  Original  Issue  Price and the  denominator  of which is the  applicable
Conversion Price.







                                      -6-

                  (D)   LIMITATION   ON   NUMBER   OF   SHARES.    Additionally,
notwithstanding  anything  set forth in this  Section 5 to the  contrary,  in no
event  shall any  holder of Series A  Preferred  Stock,  prior to the  Mandatory
Conversion  Date, be entitled to convert Series A Preferred Stock into shares of
Common  Stock to the extent  that (x) the number of shares of the  Corporation's
Common Stock  beneficially  owned by such holder and its affiliates  (other than
shares  of Common  Stock  which may be deemed  beneficially  owned  through  the
ownership of the  unconverted  portion of the shares of Series A Preferred Stock
held by such holder) plus (y) the number of shares of Common Stock issuable upon
such  conversion  would  result in  beneficial  ownership  by the holder and its
affiliates of more than 4.9% of the shares of Common Stock then outstanding. For
purposes of this Section  5(d),  beneficial  ownership  shall be  determined  in
accordance  with  Section  13(d) of the  Securities  Exchange  Act of  1934,  as
amended, and Regulation 13D and 13G promulgated thereunder,  except as otherwise
provided in clause (x) of this Section 5(d). Each holder shall,  upon delivering
to the  Corporation a notice of election to convert shares of Series A Preferred
Stock in  accordance  with  Section  5(j)  hereof,  be  required  to provide the
Corporation with a certification in form and substance  reasonably  satisfactory
to the  Corporation,  that the conversion of the Series A Preferred  Stock being
converted will not result in such holder and its affiliates beneficially holding
more than 4.9%,  determined as heretofore provided, of the outstanding shares of
Common  Stock  on  such  Conversion   Date.  If  the  holder  cannot  make  such
certification,  the shares of Series A Preferred Stock to be converted shall not
be convertible.  Notwithstanding  the foregoing,  upon the Mandatory  Conversion
Date,  all such shares of Series A  Preferred  Stock then  outstanding  shall be
converted into Common Stock in accordance with Section 5(c) hereof.

                  (E)  EQUITABLE  ADJUSTMENT.  If the  Corporation  at any  time
subdivides (by any stock split,  stock  dividend or otherwise)  its  outstanding
shares of Common Stock into a greater  number of shares,  the  Conversion  Price
shall be proportionately reduced, and, conversely,  if the outstanding shares of
Common Stock are combined into a smaller number of shares,  the Conversion Price
shall be proportionately increased.

                  (F) DIVIDENDS OTHER THAN COMMON STOCK DIVIDENDS.  In the event
the  Corporation  shall  make or  issue,  or  shall  fix a  record  date for the
determination of holders of Common Stock entitled to receive a dividend or other
distribution  (other than a distribution  in  liquidation or other  distribution
otherwise  provided for herein) with respect to the Common Stock  payable in (i)
securities of the  Corporation  other than shares of Common Stock, or (ii) other
assets (excluding cash dividends or distributions),  then and in each such event
provision  shall be made so that the  holders  of the Series A  Preferred  Stock
shall  receive  upon  conversion  thereof in addition to the number of shares of
Common Stock receivable thereupon, the number of securities or such other assets
of the  Corporation  which they would have received had their Series A Preferred
Stock been  converted  into Common  Stock on the date of such event and had they
thereafter,  during the period from the date of such event to and  including the
Conversion  Date,  retained such  securities or such other assets  receivable by
them during such period,  giving application to all other adjustments called for
during  such  period  under  this  Section 5 with  respect  to the rights of the
holders of the Series A Preferred Stock.








                                      -7-

                  (G) CAPITAL REORGANIZATION OR RECLASSIFICATION.  If the Common
Stock  issuable  upon the  conversion  of the Series A Preferred  Stock shall be
changed into the same or  different  number of shares of any class or classes of
capital   stock,   whether   by   capital   reorganization,    recapitalization,
reclassification or otherwise (other than a subdivision or combination of shares
or stock  dividend  provided for elsewhere in this Section 5, or the sale of all
or substantially all of the  Corporation's  capital stock or assets to any other
person),  then and in each such event the  holders of Series A  Preferred  Stock
shall have the right  thereafter to convert such shares into the kind and amount
of shares of capital stock and other  securities  and property  receivable  upon
such reorganization,  recapitalization,  reclassification or other change by the
holders of the number of shares of Common Stock into which such shares of Series
A  Preferred  Stock  might  have  been  converted   immediately  prior  to  such
reorganization,  recapitalization,  reclassification  or change,  all subject to
further adjustment as provided herein.

                  (H) CAPITAL  REORGANIZATION,  MERGER OR SALE OF ASSETS.  If at
any time or from time to time  there  shall be a capital  reorganization  of the
Common  Stock  (other  than  a   subdivision,   combination,   recapitalization,
reclassification or exchange of shares provided for elsewhere in this Section 5)
or a merger or consolidation of the Corporation with or into another corporation
(other than a merger or  reorganization  involving only a change in the state of
incorporation  of the Corporation or the acquisition by the Corporation of other
businesses  where the Corporation  survives as a going concern),  or the sale of
all or  substantially  all of the  Corporation's  capital stock or assets to any
other person, then, as a part of such  reorganization,  merger, or consolidation
or sale,  provision  shall be made so that the holders of the Series A Preferred
Stock shall  thereafter  be entitled to receive upon  conversion of the Series A
Preferred  Stock the number of shares of stock or other  securities  or property
(including cash) of the Corporation,  or of the successor  corporation resulting
from such merger,  consolidation  or sale,  to which such holder would have been
entitled if such  holder had  converted  its shares of Series A Preferred  Stock
into Common Stock pursuant to Section 5(a) hereof.

                  (I) CERTIFICATE AS TO ADJUSTMENTS;  NOTICE BY CORPORATION.  In
each case of an  adjustment or  readjustment  of the Original  Issue Price,  the
Corporation at its expense will furnish each holder of Series A Preferred  Stock
so  affected  with a  certificate  prepared  by an officer  of the  Corporation,
showing such  adjustment or  readjustment,  and stating in detail the facts upon
which such adjustment or readjustment is based.

                  (J)  EXERCISE  OF  CONVERSION   PRIVILEGE.   To  exercise  its
conversion  privilege,  a holder of Series A Preferred  Stock shall give written
notice by telecopy to the  Corporation at its principal  office that such holder
elects to convert  shares of its Series A Preferred  Stock and shall  thereafter
surrender the original certificate(s) representing the shares being converted to
the  Corporation at its principal  office  together with an originally  executed
copy of such  notice.  Such notice  shall also state the name or names (with its
address or  addresses,  as well as the  address(es)  for  delivery) in which the
certificate(s) for shares of Common Stock issuable upon such conversion shall be
issued.   The  certificate(s)  for  the  shares  of  Series  A  Preferred  Stock
surrendered for conversion shall be accompanied by proper assignment  thereof to
the  Corporation or in blank.  As promptly as practicable  after the Corporation
receives the original  certificate(s) for the shares of Series A Preferred Stock
surrendered for conversion, the proper assignment








                                      -8-






thereof to the  Corporation  or in blank and the original  notice of  conversion
(collectively,  the "ORIGINAL  DOCUMENTATION"),  but in no event more than three
(3) trading days after the Corporation's receipt of the Original  Documentation,
the  Corporation  shall  issue and shall  deliver to the holder of the shares of
Series A Preferred Stock being converted, at the addresses set forth therefor by
the holder, such certificate(s) as it may request for the number of whole shares
of  Common  Stock  issuable  upon the  conversion  of such  shares  of  Series A
Preferred  Stock in accordance  with the provisions of this Section 5, and cash,
as provided  in Section  5(k),  in respect of any  fraction of a share of Common
Stock issuable upon such  conversion.  Such  conversion  shall be deemed to have
been effected immediately prior to the close of business on the Conversion Date,
and at such time the rights of the holder as holder of the  converted  shares of
Series A  Preferred  Stock shall cease and the  person(s)  in whose  name(s) any
certificate(s) for shares of Common Stock shall be issuable upon such conversion
shall be deemed to have become the  holder(s)  of record of the shares of Common
Stock represented thereby. If the Corporation fails to issue and deliver to such
holder such  certificate(s)  for shares of Common Stock within three (3) trading
days  after  the  Corporation's  receipt  of  the  Original  Documentation,  the
Corporation shall pay the liquidated  damages set forth in Sections 16 and 17 of
the  Securities  Purchase  Agreement  between  the  Corporation  and the initial
purchasers of the Series A Preferred Stock.

                  (K) CASH IN LIEU OF FRACTIONAL SHARES. No fractional shares of
Common Stock or scrip  representing  fractional  shares shall be issued upon the
conversion  of shares of Series A  Preferred  Stock.  Instead of any  fractional
shares of Common  Stock that would  otherwise  be issuable  upon  conversion  of
Series A Preferred Stock, the Corporation  shall pay to the holder of the shares
of Series A Preferred Stock being converted a cash adjustment in respect of such
fractional  shares in an amount  equal to the same  fraction of the market price
per share of the Common Stock (as determined in a reasonable  manner  prescribed
by the Board of Directors) at the close of business on the Conversion  Date. The
determination  as to whether or not any fractional  shares are issuable shall be
based upon the  aggregate  number of shares of Series A  Preferred  Stock  being
converted at any one time by any holder thereof, not upon each share of Series A
Preferred Stock being converted.

                  (L) PARTIAL  CONVERSION.  In the event some but not all of the
shares of Series A Preferred Stock  represented by a certificate(s)  surrendered
by a holder are converted,  the  Corporation  shall execute and deliver to or on
the order of the holder,  at the expense of the  Corporation,  a new certificate
representing  the number of shares of Series A  Preferred  Stock  which were not
converted.  Such new  certificate  shall be so delivered on or prior to the date
set forth in Section 5(j) for the delivery of certificates  for shares of Common
Stock.

                  (M) RESERVATION OF COMMON STOCK. The Corporation  shall at all
times reserve and keep available out of its  authorized  but unissued  shares of
Common Stock,  solely for the purpose of effecting the  conversion of the shares
of the Series A Preferred  Stock,  such number of its shares of Common  Stock as
shall  from  time  to  time  be  sufficient  to  effect  the  conversion  of all
outstanding  shares of the Series A  Preferred  Stock  (including  any shares of
Series A Preferred Stock represented by any warrants,  options,  subscription or
purchase rights for the Series A Preferred Stock), and if at any time the number
of  authorized  but unissued  shares of 








                                      -9-

Common  Stock  shall not be  sufficient  to effect  the  conversion  of all then
outstanding  shares of the Series A  Preferred  Stock  (including  any shares of
Series A Preferred Stock represented by any warrants, options,  subscriptions or
purchase rights for the Series A Preferred Stock), then the Corporation shall be
deemed to be in breach and default of its obligations hereunder, and in addition
to all charges,  claims and rights at law or in equity that each holder shall be
entitled to, the Corporation shall use all means reasonably available to it, and
promptly  take  any  and  all  actions  as may be  necessary,  to  increase  its
authorized but unissued shares of Common Stock to such number of shares as shall
be sufficient for such purpose.

         6.       NOTICES OF RECORD DATE.  In the event of any:

                  (A) taking by the  Corporation  of a record of the  holders of
any class of securities for the purpose of determining  the holders  thereof who
are  entitled to receive any  dividend  or other  distribution,  or any right to
subscribe for,  purchase or otherwise acquire any shares of capital stock of any
class or any other securities or property, or to receive any other right, or

                  (B)   capital   reorganization   of   the   Corporation,   any
reclassification  or  recapitalization  of the capital stock of the Corporation,
any  merger or  consolidation  of the  Corporation,  or any  transfer  of all or
substantially all of the assets of the Corporation to any other Corporation,  or
any other entity or person, or

                  (C)  voluntary  or  involuntary  dissolution,  liquidation  or
winding up of the Corporation,

then and in each such event the  Corporation  shall telecopy and thereafter mail
or cause to be  mailed  to each  holder  of  Series A  Preferred  Stock a notice
specifying  (i) the date on which any such record is to be taken for the purpose
of such  dividend,  distribution  or right and a description  of such  dividend,
distribution  or  right,  (ii)  the  date  on  which  any  such  reorganization,
reclassification,    recapitalization,    transfer,    consolidation,    merger,
dissolution,  liquidation  or winding up is  expected to become  effective,  and
(iii) the time, if any, that is to be fixed, as to when the holders of record of
Common Stock (or other securities) shall be entitled to exchange their shares of
Common Stock (or other securities) for securities or other property  deliverable
upon  such   reorganization,   reclassification,   recapitalization,   transfer,
consolidation, merger, dissolution, liquidation or winding up. Such notice shall
be telecopied and thereafter mailed by first class mail, postage prepaid,  or by
express  overnight  courier  service,  at least ten (10) days  prior to the date
specified in such notice on which such action is to be taken.






                                                                    EXHIBIT 4.14


                          SECURITIES PURCHASE AGREEMENT
                          -----------------------------

         This Securities Purchase Agreement (the "AGREEMENT"),  dated as of June
16, 1997, is entered into by and between the parties listed on Schedule I hereto
(individually,  a "PURCHASER" and  collectively,  the "PURCHASERS") and DYNAGEN,
INC., a Delaware corporation (the "COMPANY").

         The parties hereto agree as follows:

         1. PURCHASE AND SALE OF PREFERRED  SHARES AND WARRANTS.  Upon the basis
of the representations  and warranties,  and subject to the terms and conditions
set forth in this  Agreement,  the Company  covenants  and agrees to sell to the
Purchasers on the Closing Date (as hereinafter defined) (i) the number of shares
(the "PREFERRED SHARES") of its Series A Preferred Stock (the "PREFERRED STOCK")
set forth opposite the name of such  Purchaser  under the heading "The Number of
Preferred  Shares to be  Purchased,"  each such Preferred  Share  convertible in
accordance  with the  terms  and  conditions  of the  Company's  Certificate  of
Designation for the Preferred Stock in the form of EXHIBIT A annexed hereto (the
"CERTIFICATE  OF  DESIGNATION")  on the dates set  forth in the  Certificate  of
Designation (any such date of conversion,  the "CONVERSION DATE") into shares of
the  Company's  Common  Stock (the  "CONVERSION  SHARES")  and (ii) a warrant in
substantially  the form of EXHIBIT B hereto  (the  "WARRANT")  to  purchase  the
number of shares of the Company's Common Stock (the "WARRANT  SHARES") set forth
opposite  the name of such  Purchaser  under  the  heading  "Number  of  Warrant
Shares." The Preferred Shares (together with the Warrant Shares,  the "SHARES"),
and the  Warrants  shall be  purchased  at the  aggregate  purchase  price  (the
"PURCHASE  PRICE")  set  forth  opposite  the name of such  Purchaser  under the
heading  "Aggregate  Purchase  Price."  The  Preferred  Stock and  Warrants  are
sometimes hereinafter collectively referred to as the "SECURITIES."

         2. CLOSING. The closing of the purchase and sale of the Preferred Stock
and the Warrants pursuant to Section 1 hereof shall take place at the offices of
Morse,  Zelnick,  Rose & Lander LLP, located at 450 Park Avenue,  Suite 902, New
York,  New York 10022 on such date as the  Purchasers  and the Company may agree
upon, or at such other time at which the Escrow Agent (as  hereinafter  defined)
shall have  received  all  documents  and  instructions  as it shall in its sole
judgment  deem  necessary  and   appropriate  to  consummate  the   transactions
contemplated  hereby (such time and date for the closing,  the "CLOSING  DATE").
The certificates  representing the Preferred Stock and the executed  Warrants to
be  purchased  by the  Purchasers  shall be  delivered  by, or on behalf of, the
Company  at the  closing  against  payment of the  Purchase  Price  therefor  in
immediately  available funds by, or on behalf of, the Purchasers to the attorney
trust account of Morse, Zelnick, Rose & Lander, LLP, (the "ESCROW AGENT") (Chase
Manhattan Bank, Account No. 967086639, ABA Routing Number 021000021). The Escrow
Agent shall receive from the Purchasers and the Company written  instructions of
the  Purchasers  and the Company in  substantially  the form of EXHIBIT C hereto
instructing  the  Escrow  Agent  with  respect  to the  closing  and  settlement
procedures,  subject,  however, to the terms and conditions of this Agreement on
the date the  Purchasers  deliver the Purchase  Price to the Escrow  Agent.  The
Escrow  Agent shall not release the  Purchase  Price from escrow  until it shall
have received from the Company a certificate  stating that the Purchase Price is
being funded directly to Superior  Pharmaceutical Company in connection with the
Superior  Acquisition  (as defined in Section 5(g) hereto) and that upon receipt
of such funds,  the Superior  Acquisition  shall close.  Commencing on the fifth
business  day after  delivery to the Escrow  Agent of the  Purchase  Price,  the
Purchasers,  if the purchase and sale  transaction  contemplated  hereby has not
been  consummated in accordance with the terms of this Agreement,  may terminate
the  proposed  transaction  by  notice  to the  Company  and the  Escrow  Agent,
whereupon the Escrow Agent shall  promptly  redeliver the Purchase  Price to the
Purchasers in accordance with the written instructions of the Purchasers.

         3.  REPRESENTATIONS,  WARRANTIES AND COVENANTS OF THE PURCHASERS.  Each
Purchaser  understands,  and  represents  and warrants to, and agrees with,  the
Company, that:

                  (a) The Preferred Stock (including the Conversion  Shares) and
the Warrants (including the Warrant Shares) have not been and, unless registered
under  the  Securities  Act of 1933,  as  amended  (the  "SECURITIES  ACT"),  in
accordance with the Registration  Rights Agreement (as defined in Section 6(b)),
will not be  registered  under  the  Securities  Act,  or any  other  applicable
securities  law,  and,  accordingly,  may  not be  offered,  sold,  transferred,
pledged, hypothecated or otherwise disposed of ("TRANSFERRED") unless registered
under  the  Securities   Act  or  Transferred  in  a  transaction   exempt  from
registration  under the Securities Act and any other  applicable  securities law
(in which event, each Purchaser shall be required to provide the Company with an
opinion of counsel that  registration  is not  required,  in form and  substance
reasonably satisfactory to the Company and its counsel).

                  Each Purchaser  acknowledges  and agrees that the certificates
representing  the Preferred  Shares and the Warrants and, prior to the effective
date of the  registration  thereof  under the  Securities  Act  pursuant  to the
Registration  Rights  Agreement,  the Conversion  Shares and the Warrant Shares,
will bear a legend in substantially the following form:

          THE  SECURITIES   REPRESENTED  BY  THIS   CERTIFICATE  HAVE  NOT  BEEN
          REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
          OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED, SOLD OR OTHERWISE
          TRANSFERRED,  IN THE  ABSENCE  OF SUCH  REGISTRATION  OR AN  EXEMPTION
          THEREFROM UNDER SAID ACT AND ANY APPLICABLE  STATE SECURITIES LAWS OR,
          UNLESS, IN THE OPINION OF COUNSEL, IN FORM AND SUBSTANCE  SATISFACTORY
          TO  THE  ISSUER,   SUCH  OFFER,  SALE,  OR  TRANSFER  IS  EXEMPT  FROM
          REGISTRATION OR IS OTHERWISE IN COMPLIANCE WITH THE ACT AND SUCH LAWS.

                  (b) Each  Purchaser  is an  "accredited  investor"  within the
meaning of Rule 501(a)  under the  Securities  Act,  was not  organized  for the
specific  purpose of acquiring the Securities,  and is acquiring or will acquire
the  Securities  for its own  account.  The  Purchaser  has 

                                      -2-







such  knowledge  and  experience  in financial  and business  matters that it is
capable of evaluating  the merits and risks of an investment in the  Securities.
The  Purchaser  is  aware  that it may be  required  to bear the  economic  risk
(including  the possible loss of the entire  investment) of an investment in the
Securities  for an  indefinite  period,  and it is able to bear such risk for an
indefinite period.

                  (c) Each  Purchaser is acquiring or will acquire the Preferred
Stock and the Warrants for its own account for investment  purposes and not with
a view to, or for offer or sale in connection  with, any  distribution  thereof,
except in compliance  with  applicable  securities  laws  (including  exemptions
thereunder)  or  pursuant  to an  effective  registration  statement  under  the
Securities Act. Each Purchaser agrees to offer,  sell or otherwise  transfer the
Preferred Stock  (including the Conversion  Shares) and the Warrants  (including
the Warrant  Shares) only (i) in accordance with the terms of this Agreement and
the  Warrant,  as  applicable,  and (ii)  pursuant  to  registration  under  the
Securities  Act or an exemption from  registration  under the Securities Act and
any other applicable securities law.

                  (d)  The  Company  has  furnished  or made  available  to each
Purchaser  all  material  information  relating to the  business,  finances  and
operations  of the Company and  material  information  relating to the offer and
sale of the  Securities and which have been  requested by each  Purchaser.  Each
Purchaser  and/or its  advisors,  if any, in each case,  have been  afforded the
opportunity  to ask  questions  of the  Company and have  received  satisfactory
answers to any such inquiries. Without limiting the generality of the foregoing,
each Purchaser has had the opportunity to obtain and to review the Company's (1)
Transition Report on Form 10-K for the six-month period ended December 31, 1996,
as amended by Amendment No. 1 to Transition Report on Form 10-K/A, as filed with
the Securities and Exchange Commission (the "SEC"), (2) Quarterly Report on Form
10-Q for the  fiscal  quarter  ended  March 31,  1997 and (3)  definitive  Proxy
Statement  of the Company  dated  December  27,  1996 for its Annual  Meeting of
Stockholders held on January 30, 1997 (collectively, the "SEC DOCUMENTS"), which
the  Company has filed  pursuant  to the  Securities  Exchange  Act of 1934,  as
amended (the "EXCHANGE  ACT").  Each Purchaser has had an opportunity to discuss
in depth the  Company's  business,  management  and  financial  affairs with the
Company's  management,  and has been provided  access to material  contracts and
other documents it has requested and various  informational  brochures regarding
the Company.

                  (e)  Each   Purchaser,   in  electing  to  subscribe  for  the
Securities  hereunder,  has relied upon an independent  investigation made by it
and its representative, if any. Each Purchaser has been given no oral or written
representations  or  assurances  from the Company or any  representative  of the
Company other than as set forth in this Agreement or in a document executed by a
duly  authorized   representative  of  the  Company  making  reference  to  this
Agreement.

                  (f) Each Purchaser has no existing short position with respect
to the Common Stock.




                                     -3-






                  (g)  Each  Purchaser   acknowledges   that,   except  for  the
historical  material  contained  herein  or in the SEC  Documents,  the  matters
disclosed  herein and therein are  forward-looking  statements under the federal
securities laws that involve risks and uncertainties, including, but not limited
to, the  Company's  ability  to obtain  future  financing,  the  management  and
integration of acquired  businesses and possible  future  acquisitions,  product
demand and market  acceptance  risks,  the effect of  economic  conditions,  the
impact   of   competitive    products   and   pricing,    product   development,
commercialization   and   technological   difficulties,   capacity   and  supply
constraints or difficulties,  the results of financing efforts, actual purchases
under  agreements,  and other risks  detailed in the  Company's  SEC  Documents.
Actual results could differ  materially  from those  estimated or anticipated in
these forward-looking statements.

                  (h) Each  Purchaser  is a resident of the state or country set
forth under its name on the signature page hereto.

                  (i) The foregoing  representations and warranties are true and
accurate as of the date hereof and unless  otherwise  informed in writing may be
relied upon by the Company as being true and correct as of the Closing  Date and
the date of each Purchaser's  purchase of the Securities  subscribed for herein,
and such representations and warranties shall survive such purchase.

         4.   REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY.   The  Company
represents  and warrants to, and agrees with,  the  Purchasers  that,  except as
disclosed in the Disclosure Schedule attached hereto:

                  (a) The  Company and each of its  subsidiaries  have been duly
incorporated  and are validly  existing as corporations  under the laws of their
respective  states of incorporation  and have the requisite  corporate powers to
own their properties and to carry on their businesses as now being conducted.

                  (b)  This  Agreement,  the  Certificate  of  Designation,  the
Warrants  and the  Registration  Rights  Agreement  have been  duly  authorized,
executed  and  delivered  by  the  Company  and  constitute  valid  and  binding
agreements, enforceable in accordance with their respective terms (except to the
extent that enforceability  thereof may be limited by bankruptcy,  insolvency or
other similar laws affecting  creditors' rights generally),  and the Company has
full corporate  power and authority  necessary to enter into such agreements and
to perform its obligations thereunder.

                  (c) No consent, approval, authorization or order of any court,
governmental  agency or body or arbitrator having  jurisdiction over the Company
or any of its  affiliates  or of any third party or of the  stockholders  of the
Company  is  required  for  execution  of this  Agreement,  the  Warrant  or the
Registration  Rights Agreement or the performance of its obligations  under such
agreements,  including,  without  limitation,  the  issuance  and  sale  of  the
Preferred  Stock,  the  Conversion  Shares,  the Warrant and the Warrant  Shares
(except for the  registration of the Conversion  Shares and Warrant Shares under
the Securities Act pursuant to the Registration 




                                      -4-






Rights Agreement, the listing of the Conversion Shares and the Warrant Shares on
the NASDAQ SmallCap Market and any notices of sale required to be filed with the
SEC pursuant to Regulation D promulgated  under the  Securities Act or any state
securities  law  authority  pursuant  to  applicable  blue sky laws may be filed
within the applicable periods therefor).

                  (d)  Neither  the sale of the  Preferred  Stock  and  Warrants
pursuant to this Agreement,  nor the  performance of its obligations  under this
Agreement,  the  Certificate  of  Designation  (including  the  issuance  of the
Conversion  Shares  thereunder),  the  Warrants  (including  the issuance of the
Warrant Shares  thereunder) or the Registration  Rights Agreement by the Company
will:

                       (i)  violate,  conflict  with,  result in a breach of, or
constitute  a default  (or an event which with the giving of notice or the lapse
of time or both would be reasonably  likely to  constitute a default)  under (A)
the  Certificate  of  Incorporation  or By-laws of the Company,  (B) any decree,
judgment,  order, law, treaty, rule,  regulation or determination  applicable to
the Company of any court,  governmental  agency or body,  or  arbitrator  having
jurisdiction  over the Company or over the  properties or assets of the Company,
the  violation,  conflict,  breach or  default  of which  would  have a material
adverse effect on the Company and its  subsidiaries  considered as a whole,  (C)
the terms of any bond, debenture, or any other evidence of indebtedness,  or any
agreement, stock option or other similar plan, indenture,  lease, mortgage, deed
of trust or other  instrument  to which  the  Company  is a party,  by which the
Company is bound,  or to which any of the  properties of the Company is subject,
the  violation,  conflict,  breach or  default  of which  would  have a material
adverse effect on the Company and its subsidiaries considered as a whole, or (D)
the terms of any "lockup" or similar  provision of any  underwriting  or similar
agreement to which the Company is a party; or

                       (ii) result in the  creation or  imposition  of any lien,
claim or other encumbrance upon any of the assets of the Company.

                  (e) As of the Closing Date,  the Preferred  Stock will be duly
and validly authorized and (i) will be free and clear of any security interests,
liens, claims or other encumbrances, (ii) will be duly and validly issued, (iii)
will be fully  paid  and  nonassessable,  (iv)  will  not be  issued  or sold in
violation  of any  preemptive  or other  similar  rights of the  holders  of any
securities  of the  Company,  and (v) will not subject  the  holders  thereof to
personal  liability by reason of being such  holders.  The Warrant has been duly
and validly  authorized and when issued and delivered pursuant to this Agreement
will have been duly executed,  issued and delivered and will constitute a legal,
valid,  binding and enforceable  obligation of the Company (except to the extent
that  enforceability  thereof may be limited by bankruptcy,  insolvency or other
similar laws affecting creditors' rights generally).

                  (f) As of the Closing Date, the Conversion  Shares and Warrant
Shares will be duly and validly  authorized  and when issued in accordance  with
the  terms of this  Agreement  and the  Certificate  of  Designation  (as to the
Conversion  Shares) and the Warrants (as to the Warrant Shares) (i) will be free
and clear of any security interests,  liens, claims or other encumbrances,  



                                      -5-




(ii)  will  be  duly  and  validly   issued,   (iii)  will  be  fully  paid  and
nonassessable,  (iv)  will not have  been  issued  or sold in  violation  of any
preemptive  or other  similar  rights of the  holders of any  securities  of the
Company,  and (v) will not  subject the  holders  thereof to personal  liability
solely by reason of being such holders.

                  (g)  Except  as set  forth in the SEC  Documents,  there is no
pending or, to the best  knowledge  of the  Company,  threatened  action,  suit,
proceeding or investigation  before any court,  governmental  agency or body, or
arbitrator  having  jurisdiction  over the Company or any of its affiliates that
would  materially  adversely  affect the results of operations of the Company or
adversely affect the execution by the Company of, or materially adversely affect
the performance by the Company of its  obligations  under,  this Agreement,  the
Certificate of Designation, the Warrant or the Registration Rights Agreement, or
the transactions contemplated hereby or thereby.

                  (h) Neither the Company, nor any authorized  representative of
the Company,  has made any written or oral  communication in connection with the
offer or sale of the  securities  offered  hereby  which  contained  any  untrue
statement of a material fact or omitted to state any material fact  necessary in
order to make the statements, in the light of the circumstances under which they
were made, not misleading.

                  (i) None of the Company,  any affiliate of the Company, or any
person  acting on behalf of the Company or any such  affiliate  has engaged,  or
will engage, in any general  solicitation or general advertising with respect to
the Preferred Stock or the Warrants.

                  (j) The Company is duly  organized,  validly  existing  and in
good standing under the laws of the state of Delaware and is duly qualified as a
foreign  corporation  in all  jurisdictions  in which the  failure to so qualify
would have a material adverse effect on the Company and its  subsidiaries  taken
as a whole. The Company has registered its Common Stock pursuant to the Exchange
Act, and the Common Stock is listed and currently  trades on the NASDAQ SmallCap
Market.  The Company is not in violation  of the  applicable  listing  agreement
between the Company and any securities exchange or market on which the Company's
securities are listed. The Company has timely filed all materials required to be
filed pursuant to all reporting  obligations under either Section 13(a) or 15(d)
of the Exchange Act for at least twelve (12) months  immediately  preceding  the
date hereof, and has received no notice, either oral or written, with respect to
the  continued  eligibility  for such  listing.  The Company has timely made all
filings required under the Exchange Act during the twelve month period preceding
the date  hereof and is  eligible  to use Form S-3 to  register  the  Conversion
Shares  and  Warrant  Shares.  As  of  their  respective  dates,  the  financial
statements of the Company  included in the SEC Documents  complied as to form in
all material respects with applicable accounting  requirements and the published
rules and regulations of the SEC with respect thereto. Such financial statements
have been prepared in accordance with generally accepted accounting  principles,
consistently applied during the periods involved (except (i) as may be otherwise
indicated in such financial statements or the notes thereto, or (ii) in the case
of unaudited interim statements, to the extent they may exclude footnotes or may
be condensed or summary  statements) and fairly present in all material 




                                      -6-




respects the  financial  position of the Company as of the dates thereof and the
results of its operations and cash flows for the periods then ended (subject, in
the case of unaudited statements,  to normal year-end audit adjustments).  Prior
to the  date  hereof,  the  Company  has  corrected  all  statements  in the SEC
Documents which have required correction and has filed all necessary  amendments
to the SEC Documents, in each case as required by applicable law.

                  (k) As of the date hereof, the authorized capital stock of the
Company  consists of (i)  75,000,000  shares of Common  Stock $.01 par value per
share,  of  which  30,122,477  shares  were  issued  and  outstanding,  and (ii)
10,000,000  shares of  preferred  stock,  $.01 par value per share,  of which no
shares  were  issued and  outstanding.  Immediately  prior to the closing of the
purchase and sale of the Preferred Stock and the Warrants  pursuant to Section 1
hereof, no shares of Preferred Stock will be outstanding. All outstanding shares
of Common Stock have been validly  issued and are fully paid and  nonassessable.
No shares of Common Stock are subject to preemptive  rights or any other similar
rights or any liens or encumbrances suffered or permitted by the Company. Except
as  disclosed  in the SEC  Documents,  (i)  there  are no  outstanding  options,
warrants,  scrip,  rights to subscribe to, calls or commitments of any character
whatsoever relating to, or securities or rights convertible into or exchangeable
for, any shares of capital stock of the Company or any of its  subsidiaries,  or
arrangements  by which the Company or any of its  subsidiaries  is or may become
bound to issue  additional  shares of capital stock of the Company or any of its
subsidiaries  (all such  securities and rights  contained in this subsection (i)
are hereinafter collectively referred to as "Derivative  Securities"),  and (ii)
there are no outstanding  debt  securities of the Company.  The Company has made
available to the Purchaser true and correct copies of the Company's  Certificate
of Incorporation, as amended, as in effect on the date hereof, and the Company's
By-laws.  As of the  Closing  Date and  before  giving  effect  to the  Superior
Acquisition  (as defined in Section  5(g)  hereof) and the Closing  contemplated
hereunder,  (i)  the  authorized  capital  stock  of  the  Company  will  be (x)
75,000,000  shares  of  Common  Stock,  $.01  par  value  per  share,  of  which
31,789,14430,497,477  shares will be issued and  outstanding  and (y) 10,000,000
shares of Preferred Stock,  $.01 par value per share, of which (A) 50,000 shares
have been designated Series A Preferred Stock, of which no shares are issued and
outstanding  and (B) 7,500  shares  have been  designated  as Series B Preferred
Stock, all of which are issued and outstanding and (ii) the Company has reserved
for issuance no more than 11,000,000  shares of Common Stock with respect to the
Derivative Securities.

                  (l) The Company  undertakes  and agrees to make all  necessary
filings in connection with the sale of the securities offered hereby as required
by the  United  States  laws  and the  regulations  or any  domestic  securities
exchange or trading market.

                  (m)  Except as set forth in the SEC  Documents,  since July 1,
1996, there has been no material adverse development in the assets, liabilities,
business properties, operations, financial condition or results of operations of
the Company and its subsidiaries taken as a whole, other than continued losses.

                  (n) None of the filings of the Company with the SEC since July
1, 1996  contained,  at the time they were  filed,  any  untrue  statement  of a
material  fact or  omitted  to state 





                                      -7-





any  material  fact  required  to be stated  therein  or  necessary  to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading.  The Company has since July 1, 1996 timely filed all  requisite
forms,  reports and exhibits thereto with the SEC. As of their respective dates,
the SEC Documents complied in all material respects with the requirements of the
Exchange Act and the rules and  regulations  of the SEC  promulgated  thereunder
applicable  to the SEC  Documents.  Prior to the date  hereof,  the  Company has
corrected all statements in the SEC Documents which have required correction and
has  filed  all  necessary  amendments  to the SEC  Documents,  in each  case as
required by applicable law.

                  (o)  Except  as set  forth in the SEC  Documents,  there is no
known  fact to the  Company  or any  subsidiary  (other  than  general  economic
conditions generally known to the public) that has not been disclosed in writing
to the  Purchasers  that (i) could  reasonably  be  expected  to have a material
adverse  effect on the  condition  (financial  or otherwise) or in the earnings,
business affairs, properties or assets of the Company or any subsidiary, or (ii)
could  reasonably be expected to adversely  affect the ability of the Company or
any  subsidiary  to perform  its  obligations  pursuant to this  Agreement,  the
Certificate of Designation, the Registration Rights Agreement or the Warrant.

                  (p) The Company  acknowledges  and agrees that  Purchasers are
acting solely in the capacity of an arm's length  purchaser with respect to this
Agreement  and  the   Registration   Rights   Agreement  and  the   transactions
contemplated  hereby  and  thereby.   The  Company  further   acknowledges  that
Purchasers are not acting as a financial advisor or fiduciary of the Company (or
in any similar  capacity)  with respect to this  Agreement and the  Registration
Rights  Agreement and the transactions  contemplated  hereby and thereby and any
advice  given by the  Purchasers  or any of its  representatives  or  agents  in
connection  with this  Agreement and the  transactions  contemplated  hereby and
thereby is merely incidental to the Purchasers' purchase of the Securities.  The
Company  further  represents to the  Purchasers  that the Company's  decision to
enter into this Agreement and the  Registration  Rights Agreement has been based
solely on the independent evaluation by the Company and its representatives.

                  (q)  Neither  the  Company,  nor any of its  affiliates,  has,
directly or indirectly,  made any offers or sales of any securities or solicited
any  offers  to  buy  any  security,  under  circumstances  that  would  require
registration of the Preferred Stock or the Warrants under the Securities Act.

                  (r) Except as set forth  within this  Agreement  or in the SEC
Documents, the Company and its subsidiaries own, have obtained or possess rights
to use the trademarks,  trade names,  service marks, service mark registrations,
patents, copyrights,  licenses,  approvals,  governmental authorizations,  trade
secrets and other rights necessary to conduct their respective businesses as now
conducted,  the Company does not have any knowledge of any material infringement
by the Company or its subsidiaries of any trademark,  trade name rights,  patent
rights, copyrights,  licenses, service marks, service mark registrations,  trade
secrets  or other  similar  rights of others,  and there is no claim  being made
against the Company or its subsidiaries regarding trademark, trade name, patent,
copyright,  license, service marks, service mark registrations,  trade 




                                      -8-




secret or other  infringement  which could have a material adverse effect on the
Company.  The  Company  and its  subsidiaries  have  taken  reasonable  security
measures  to  protect  the  secrecy,  confidentiality  and value of all of their
intellectual properties.

                  (s) The Company  understands and  acknowledges the potentially
dilutive effect to the Common Stock of the issuance of the Conversion Shares and
the Warrant Shares.

          5.      COVENANTS OF THE  COMPANY.  The Company  covenants  and agrees
with the Purchaser:

                  (a) To  comply  with  all  requirements  of  Section  4(2) and
Section 3(a)(9), as applicable,  and to the extent applicable Regulation D under
the  Securities  Act,  with  respect  to the sale of the  Preferred  Stock,  the
Conversion Shares, the Warrants and the Warrant Shares, respectively.

                  (b) To notify the  Purchasers  promptly  if at any time during
the period  beginning  on the date of this  Agreement  and ending on the Closing
Date any event  shall  have  occurred  as a result of which any  written or oral
communication  made by the Company or any  authorized  person  representing  the
Company,  would include an untrue  statement of a material fact or omit to state
any material  fact  necessary in order to make the  statements  therein,  in the
light of the circumstances under which they were made, not misleading.

                  (c) To cause the  Conversion  Shares and Warrant Shares to be,
upon delivery,  fully paid,  nonassessable,  free of preemptive  rights and free
from all taxes, liens, charges, security interests or other encumbrances.

                  (d) To have at all times authorized and reserved for issuance,
free from  preemptive  rights,  a  sufficient  number of shares of Common  Stock
solely for the purpose of satisfying  the  conversion  rights of the  Purchasers
pursuant to the terms and conditions of the  Certificate of Designation  and the
Warrants  and to satisfy the  issuance of any other shares of Common Stock which
are reserved for issuance or which are issuable upon the  exercise,  conversion,
exchange or satisfaction of any outstanding  securities or obligations or rights
of the Company.  The Company shall not issue any shares of Common Stock,  or any
securities convertible into, or warrants,  options and the like exercisable for,
shares of Common Stock,  if as a result  thereof the Company may  reasonably not
have  sufficient  shares of authorized but unissued  Common Stock  sufficient to
satisfy in full the conversion  rights of the  Purchasers  pursuant to the terms
and conditions of the Certificate of Designation and the Warrants.

                  (e) Each party shall use its best efforts to take, or cause to
be taken,  all  action  and to do, or cause to be done,  all  things  necessary,
including without  limitation,  timely to satisfy the conditions to be satisfied
as provided in Section 6 and 7 of this Agreement, to consummate the transactions
contemplated hereby.

                  (f) Until the  earlier of (i) the date which is one year after
the date as of which 


                                      -9-







the  Holders  (as that  term is  defined  in  Section  8(b)) may sell all of the
Conversion Shares without restriction  pursuant to Rule 144(k) promulgated under
the  Securities  Act (or  successor  thereto)  or (ii) the date on which (a) the
Holders  shall have sold all the  Conversion  Shares and Warrant  Shares and (b)
none of the Preferred Stock or Warrants are outstanding,  the Company shall file
all reports  required to be filed with the SEC pursuant to the Exchange Act, and
the Company shall not voluntarily  terminate its status as a Company required to
file  reports  under the  Exchange Act even if the Exchange Act or the rules and
regulations thereunder would permit such termination.

                  (g) The  Company  will use the  proceeds  from the sale of the
Securities for the  consummation of the  acquisition of Superior  Pharmaceutical
Company (the "SUPERIOR ACQUISITION") pursuant to that certain Agreement and Plan
of Merger dated as of March 7, 1997, as amended, as provided for in Section 2.

                  (h) The  Company  shall  promptly  secure  the  listing of the
Conversion Shares and Warrant Shares upon each national  securities  exchange or
automated  quotation  system, if any, upon which shares of Common Stock are then
listed or quoted (subject to official notice of issuance) and shall maintain the
listing of all such  shares from time to time  issuable  under the terms of this
Agreement, the Certificate of Designation and the Registration Rights Agreement.
During  the  period  that the  Company  is  required  to  maintain  effective  a
registration  statement  covering the Conversion Shares and Warrant Shares,  the
Company  shall  maintain  the Common  Stock's  authorization  for listing on the
NASDAQ SmallCap Market and any such other national securities exchange.

                  (i) The Company shall, prior to any issuance by the Company of
any of its  securities  issued  in a private  placement  financing  pursuant  to
Regulation D or Regulation S of the Securities  Act (other than debt  securities
with no equity  feature),  offer to each  Purchaser by written notice the right,
for a period of five (5) days, to purchase all of such securities for cash at an
amount equal to the price or other  consideration  for which such securities are
to be issued; provided, however, that the first refusal rights of the Purchasers
pursuant  to this  Section  5(i) shall not apply to  securities  issued (A) upon
conversion of any of the Preferred Shares or exercise of the Warrants,  (B) as a
stock dividend or upon any subdivision of shares of Common Stock,  provided that
the securities issued pursuant to such stock dividend or subdivision are limited
to additional shares of Common Stock, (C) pursuant to  subscriptions,  warrants,
options,  convertible  securities,  or other rights which are outstanding on the
date of this Agreement, (D) solely as non-cash consideration for the acquisition
(whether by merger or  otherwise) by the Company or any of its  subsidiaries  of
all or  substantially  all of the  stock or  assets  of any  other  entity,  (E)
pursuant  to the  exercise  of  options  to  purchase  Common  Stock  granted to
directors,  officers, employees or consultants of the Company in connection with
their  service to the  Company,  (F)  pursuant to any other  transaction  by the
Company in  connection  with the  financing of the Superior  Acquisition  or any
other similar  acquisition by the Company and (G) upon the exercise of any right
which  was not  itself  in  violation  of the terms of this  Section  5(i).  The
Company's  written  notice  to the  Purchasers  shall  describe  the  securities
proposed to be issued by the  Company and specify the number,  price and payment
terms.  Each Purchaser agrees to keep the terms and existence of such securities
issuance  confidential.  Each Purchaser may accept the Company's offer as to the
full 

                                      -10-








number of  securities  offered to it or any  lesser  number,  by written  notice
thereof given by it to the Company prior to the expiration of the aforesaid five
(5) day  period,  in  which  event  the  Company  shall  promptly  sell and such
Purchaser shall buy, upon the terms specified,  the number of securities  agreed
to be  purchased  by  such  Purchaser.  Notwithstanding  the  foregoing,  if the
Purchasers  agree,  in the  aggregate,  to purchase more than the full number of
securities offered by the Company,  then each Purchaser  accepting the Company's
offer shall first be allocated the lesser of (i) the number of securities  which
such Purchaser  agreed to purchase and (ii) the number of securities as is equal
to the  full  number  of  securities  offered  by the  Company  multiplied  by a
fraction, the numerator of which shall be the number of Preferred Shares held by
such  Purchaser  as of the date of the  Company's  notice of offer  held by such
Purchaser on the date such offer is made and the  denominator  of which shall be
the aggregate number of Preferred Shares held on such date by all Purchasers who
accepted the Company's offer, and the balance of the securities (if any) offered
by the Company shall be allocated  among the Purchasers  accepting the Company's
offer in proportion  to their  relative  holdings of the issued and  outstanding
Preferred  Shares,  provided that no Purchaser  shall be allocated more than the
number of  securities  which such  Purchaser  agreed to  purchase  and  provided
further that in cases covered by this sentence all Purchasers shall be allocated
among them the full number of  securities  offered by the  Company.  The Company
shall be free at any time prior to one hundred  and eighty  (180) days after the
date of its  notice of offer to the  Purchasers,  to offer and sell to any third
party or parties the number of such  securities  not agreed by the Purchasers to
be purchased by them, at a price and on payment  terms no less  favorable to the
Company than those specified in such notice of offer to the Purchasers. However,
if such third  party sale or sales are not  consummated  within such one hundred
and eighty (180) day period, the Company shall not sell such securities as shall
not have been  purchased  within such period  without again  complying with this
Section 5(i).  The rights of the first offer pursuant to this Section 5(i) shall
terminate as to each  individual  Purchaser when such Purchaser  holds less than
fifty  percent  (50%) of the  original  number of  Preferred  Shares  originally
purchased pursuant to this Agreement.  The rights contained in this Section 5(i)
are not transferable by the Purchasers.

         6.       CONDITIONS  PRECEDENT  TO  THE  PURCHASER'S  OBLIGATIONS.  The
obligations  of the Purchasers  hereunder are subject to the  performance by the
Company of its  obligations  hereunder and to the  satisfaction of the following
additional conditions precedent:

                  (a) The  representations and warranties made by the Company in
this Agreement  shall,  unless waived by the Purchasers,  be true and correct in
all material  respects as of the date hereof and at the Closing  Date,  with the
same  force and effect as if they had been made on and as of the  Closing  Date.
The  Company  shall have  performed,  satisfied  and  complied  in all  material
respects  with  the  covenants,  agreements  and  conditions  required  by  this
Agreement to be performed, satisfied or complied with by the Company at or prior
to the Closing Date.

                  (b) The Company and the Purchasers shall have entered into the
Registration   Rights  Agreement  (the   "REGISTRATION   RIGHTS  AGREEMENT")  in
substantially the form annexed hereto as EXHIBIT D.

                                      -11-






                  (c) The Company will provide to the  Purchasers  an opinion or
opinions of counsel in substantially the form annexed hereto as Exhibit E.

                  (d)  The  Company   shall  have  filed  the   Certificate   of
Designation with the Secretary of the State of Delaware.

                  (e) None of the following shall have occurred: (i) any general
suspension  of trading in, or  limitation on prices listed for, the Common Stock
on the NASDAQ,  (ii) a declaration of a banking  moratorium or any suspension of
payments in respect to banks in the United  States,  (iii) a  commencement  of a
war, armed  hostilities or other  international or national calamity directly or
indirectly  involving  the  United  States,  (iv) in the  case of the  foregoing
existing at the date of this  Agreement,  a material  acceleration  or worsening
thereof,  or (v) any  limitation  by the  federal  or state  authorities  on the
extension  of credit by  lending  institutions  that  materially  and  adversely
affects the Purchaser.

                  (f) The  Company  shall have  executed  and  delivered  to the
Escrow Agent the certificates representing the Preferred Stock and the Warrants.

                  (g) No action, suit,  investigation or proceeding before or by
any governmental  authority shall have been commenced or threatened  against the
Company or any of the officers,  directors or  affiliates of the Company,  which
seeks to restrain,  prevent or challenge the  transactions  contemplated by this
Agreement  or the  Registration  Rights  Agreement  or which  seeks  damages  in
connection with such transactions.

                  (h) The Company shall  consummate the Superior  Acquisition on
the Closing Date concurrently with the closing hereunder.

         7.       CONDITIONS PRECEDENT TO THE COMPANY'S OBLIGATIONS.

                  (a) The  obligations  of the Company  hereunder are subject to
the  performance  by the  Purchasers of their  obligations  hereunder and to the
satisfaction of the condition  precedent that the representations and warranties
made by the Purchasers in this Agreement shall, unless waived by the Company, be
true and  correct  in all  material  respects  as of the date  hereof and at the
Closing Date,  with the same force and effect as if they had been made on and as
of the Closing Date.

                  (b) The Purchasers shall have delivered to the Escrow Agent by
wire transfer the Purchase Price for the Securities.

         8.       TRANSFER OF SECURITIES.

                  (a) Securities  Act Legend.  Each  certificate  evidencing the
Preferred  Stock  and the  Warrants,  and,  prior to the  effective  date of the
registration  thereof  pursuant  to  the  Registration  Rights  Agreement,   the
Conversion  Shares and the  Warrant  Shares,  and any  


                                      -12-







certificates issued upon transfer or exchange of the foregoing, shall be stamped
or imprinted  with the legend  substantially  as set forth in Section 3(a).  The
legend set forth in Section 3(a) shall be removed and the Company  shall issue a
certificate  without  such  legend to the  holder of the  Preferred  Stock,  the
Conversion  Shares,  the Warrant and the Warrant Shares as applicable upon which
it is stamped,  if, unless otherwise required by state securities laws, (a) with
respect  to the  Conversion  Shares  and the  Warrant  Shares,  the  sale of the
Conversion Shares or the Warrant Shares, as the case may be, is registered under
the Securities Act, or (b) in connection  with a Transfer,  such holder provides
the Company with an opinion of counsel, in form,  substance and scope reasonably
acceptable  to the  Company,  to the effect that a Transfer  thereof may be made
without  registration  under the Securities Act, or (c) such holder provides the
Company with  reasonable  assurances  that the Preferred  Stock,  the Conversion
Shares, the Warrant and the Warrant Shares, as applicable,  can be sold pursuant
to  Rule  144  under  the   Securities   Act  (or  a  successor  rule  thereto).
Notwithstanding the removal of any such legend, Purchaser agrees to Transfer the
Preferred  Stock,  the Conversion  Shares,  the Warrant and the Warrant  Shares,
including  those  represented by  certificate(s)  from which the legend has been
removed,  in  compliance  with  all  applicable  securities  laws  and,  if,  in
connection  with any Transfer,  a legend would be appropriate  under  applicable
securities  laws,  Purchaser  shall, in connection with any such Transfer ensure
that  the  certificates  representing  shares  so  Transferred  shall  bear  the
foregoing legend.

                  (b) Securities Act  Compliance.  Each holder (a "HOLDER") of a
certificate  evidencing the Preferred Stock, the Conversion Shares, the Warrants
and the Warrant Shares which bears the  restrictive  legend set forth in Section
8(a) above (the  "RESTRICTED  SECURITIES"),  and who  proposes to  Transfer  any
Restricted  Securities  (other  than  pursuant  to  an  effective   registration
statement  under the Securities Act or pursuant to Rule 144 under the Securities
Act),  shall give written  notice to the Company of such  Holder's  intention to
effect  such   Transfer.   Each  such  notice  shall  describe  the  manner  and
circumstances of the proposed sale or other disposition in sufficient detail and
shall be accompanied by an opinion of legal counsel to the Holder. Promptly upon
receipt of such notice,  the Company shall present a copy thereof (together with
any  accompanying  opinion of legal counsel to the Holder) to its legal counsel,
and the following provisions shall apply:

                           (i) If,  in the  opinion  of  legal  counsel  to such
Holder,  reasonably  satisfactory  in form and  substance to the Company and its
legal  counsel,  or if such  notice was not  accompanied  by an opinion of legal
counsel to the Holder, then, if, in the opinion of legal counsel to the Company,
the proposed sale or other  disposition may be effected without  registering the
Restricted   Securities  involved  under  the  Securities  Act  or  under  state
securities  laws,  such Holder shall be entitled to so Transfer such  Restricted
Securities in accordance with the terms of such notice  delivered to the Company
pursuant to this paragraph (b). The Company will advise the Holder, within three
(3) business days after submission of such notice,  whether the Company believes
such Holder is entitled to so Transfer the  Restricted  Securities in accordance
with the  foregoing.  If the Holder is entitled to so Transfer,  he shall submit
the stock certificate or certificates evidencing the Restricted Securities to be
Transferred  to the  Company in proper  form for  Transfer  and  accompanied  by
appropriate  instruments  of Transfer and the Company shall



                                      -13-


promptly issue new certificates giving effect to such Transfer. Certificates for
Restricted Securities thus Transferred (and each of the certificates  evidencing
any untransferred  balance of the Conversion Shares or the Warrant Shares not so
transferred)  shall  bear the  restrictive  legend  set forth in  Section  8(a),
unless,  in the opinion of such Holder's legal  counsel,  which opinion shall be
reasonably  satisfactory  in form and  substance  to counsel for the Company (or
legal  counsel to the  Company  if the Holder did not  present an opinion of its
legal counsel),  such legend is not required by the applicable provisions of the
Securities Act or state securities laws; and

                           (ii) If in the  reasonable  opinion of either of such
legal  counsel (or legal counsel to the Company if the Holder did not present an
opinion of its legal counsel),  the proposed Transfer cannot be effected without
registering the Restricted Securities involved under the Securities Act or state
securities  laws,  such Holder  shall not offer to  Transfer  or  Transfer  such
Restricted  Securities  unless and until such  Restricted  Securities  have been
registered under the Securities Act or state securities laws for such purpose or
an exemption from such registration becomes available.  Upon the consummation of
the transactions  contemplated by this Agreement,  the Company shall have agreed
to register the Conversion  Shares and the Warrant Shares  pursuant to the terms
of the Registration Rights Agreement.

                  (c) Subject to the restrictions set forth in Sections 8(a) and
(b) above,  upon the valid  conversion of the Preferred Stock or exercise of the
Warrants,  the Company shall instruct its transfer agent to issue  certificates,
registered  in the name of each  Purchaser  or its nominee,  for the  Conversion
Shares and the Warrant  Shares in such amounts as specified from time to time by
the respective Purchasers to the Company. The Company shall provide instructions
and opinions of counsel to its transfer  agent in  accordance  the  Registration
Rights Agreement and this Section 8. Upon the  effectiveness of the registration
of the  Conversion  Shares and the Warrant Shares  pursuant to the  Registration
Rights  Agreement  and  thereafter,  any  Conversion  Shares or  Warrant  Shares
theretofore  issued bearing a restrictive legend of any kind may be submitted to
the Company for removal of such legend,  and within  three (3) business  days of
receipt thereof the Company shall cause to be issued and delivered to the Holder
submitting the certificates  for such shares new  certificates  representing the
same  number  of shares  that bear no  restrictive  legend  and that are  freely
transferable  on the books and records of the Company  and its  transfer  agent,
subject to such Holder's compliance with applicable  securities laws,  including
but not limited to such Holder's  obligation  pursuant to the  Securities Act to
provide a  prospectus  to buyers of such shares and further  subject to Sections
3(e) and 4(c) of the  Registration  Rights  Agreement.  Nothing in this  Section
shall affect in any way Purchasers' obligations and agreement to comply with all
applicable  securities laws upon resale of the Conversion Shares and the Warrant
Shares.

         9. Fees and Expenses.  Each of the Purchasers and the Company agrees to
pay its  respective  expenses  incident to the  performance  of its  obligations
hereunder,  including,  but not limited to, the fees,  expenses,  due  diligence
costs and disbursements of such party's counsel.

         10. Survival of the  Representations,  Warranties,  etc. The respective
agreements,  representations,  warranties, indemnities and other statements made
by or on behalf of the Company and the Purchaser, respectively, pursuant to this
Agreement,  shall  remain  in full  force



                                      -14-


and effect for a period of one year,  regardless of any investigation made by or
on behalf of the other  party to this  Agreement  or any  officer,  director  or
employee of, or person  controlling or under common control with, such party and
will survive  delivery of any payment for the Preferred  Stock,  the  Conversion
Shares, the Warrants and the Warrant Shares.

         11. Notices. All notices,  requests and other communications  hereunder
must be in writing and  delivered to the parties at the  following  addresses or
facsimile numbers:

If to the Purchasers, to:

         The addresses listed on Schedule I attached hereto.

If to the Company, to:

         DynaGen, Inc.
         99 Erie Street
         Cambridge, MA  02139
         Attention:  President

         Telephone:        (617) 491-2527
         Telecopy:         (617) 354-3902

All such  notices,  requests  and  other  communications  will (i) if  delivered
personally  (including,  without  limitation,  by  reputable  overnight  courier
service)  to the  address as  provided  in this  Section,  be deemed  given upon
delivery, (ii) if delivered by facsimile transmission to the facsimile number as
provided in this Section,  be deemed given upon telecopy generated  confirmation
of receipt,  and (iii) if delivered by mail in the manner described above to the
address as provided in this Section,  be deemed given upon receipt (in each case
regardless of whether such notice, request or other communication is received by
any other  Person to whom a copy of such notice is to be  delivered  pursuant to
this  Section).  Any party from time to time may change its  address,  facsimile
number or other  information  for the purpose of notices to that party by giving
notice specifying such change to the other parties hereto.

         12. Third Party  Beneficiary.  Any permitted  transferee of any part of
the principal amount of the Preferred Stock, the Conversion Shares, the Warrants
and the Warrant  Shares  shall be a third  party  beneficiary  of the  Company's
obligations  under this  Agreement,  the  Warrants and the  Registration  Rights
Agreement.  Such person  shall have all the rights of a third party  beneficiary
with  respect to the  enforcement  against the Company of any  provision of this
Agreement, the Warrants and the Registration Rights Agreement.

         13.      Miscellaneous.

                  (a) This Agreement may be executed in one or more counterparts
and it is not  necessary  that  signatures  of all  parties  appear  on the same
counterpart,  but such  counterparts



                                      -15-


together shall constitute but one and the same agreement.  This Agreement,  once
executed  by a  party,  may  be  delivered  to  the  other  party  by  facsimile
transmission  of a copy of this Agreement  bearing the signature of the party so
delivering this Agreement.

                  (b)  This  Agreement  shall  inure  to the  benefit  of and be
binding upon the parties  hereto,  their  respective  successors  and  permitted
assigns.

                  (c) This  agreement  shall be governed  by, and  construed  in
accordance  with,  the laws of the State of Delaware  (without  giving effect to
conflicts of laws principles).  Each of the parties consents to the jurisdiction
of the federal courts whose districts encompass any part of the City of New York
or the state  courts of the State of New York sitting in the City of New York in
connection with any dispute  arising under this Agreement and hereby waives,  to
the maximum  extent  permitted by law, any  objection,  including  any objection
based on forum non  conveniens,  to the bringing of any such  proceeding in such
jurisdictions.

                  (d) The  headings of the sections of this  document  have been
inserted for  convenience of reference only and shall not be deemed to be a part
of this Agreement.

                  (e) The provisions of this Agreement are severable, and if any
clause or provision shall be held invalid,  illegal or unenforceable in whole or
in part in any  jurisdiction,  then such  invalidity or  unenforceability  shall
affect in that jurisdiction only such clause or provision,  or part thereof, and
shall  not  in  any  manner  affect  such  clause  or  provision  in  any  other
jurisdiction  or  any  other  clause  or  provision  of  this  Agreement  in any
jurisdiction.

                  (f) This  Agreement,  including  the  schedules  and  exhibits
hereto, constitutes the sole and entire agreement of the parties with respect to
the subject matter hereof.

                  (g) Each party shall do and  perform,  or cause to be done and
performed,  all such further acts and things,  and shall execute and deliver all
such other agreements, certificates, instruments and documents, as the party may
reasonably  request in order to carry out the intent and accomplish the purposes
of this Agreement and the consummation of the transactions contemplated hereby.

                  (h)  Notwithstanding any of the  representations,  warranties,
acknowledgments  or  agreements  made herein by the Company and  Purchaser,  the
Company and  Purchasers do not thereby or in any manner waive any rights granted
to it or him under U.S. Federal or state securities laws.

                  (i) The  provisions  of this  Agreement,  other than  Sections
5(i), 8, 10 and 12, shall terminate when all Preferred  Shares and Warrants have
been  converted into shares of the Company's  Common Stock that are  unlegended,
unrestricted and are freely transferable on the books and records of the Company
and its transfer  agent,  subject to each Holder's  compliance  with  applicable
securities laws,  including but not limited to such Holder's obligation pursuant
to the  Securities  Act to provide a prospectus  to buyers of such  shares,  and
further subject to



                                      -16-


Sections 3(e) and 4(c) of the Registration Rights Agreement.

         14. Time of Essence. Time shall be of the essence in this Agreement.

         15. Delivery of Stock; Dividend Payments.

                  (a) The Company  will permit each  Purchaser  to exercise  its
right to convert the Preferred  Stock and exercise the Warrants by telecopying a
notice of  conversion in  accordance  with the  Certificate  of  Designation  (a
"Notice  of  Conversion")  or  Form  of  Subscription  annexed  to the  Warrant,
respectively,  to the Company and delivering thereafter, as the case may be, (i)
the original Notice of Conversion and Preferred Stock  certificate,  or (ii) (A)
Form of  Subscription,  (B) cash or certified or official  bank check payable to
the Company and (C) Warrant (the "Original Documentation"),  by express courier.
Each date on which a Notice of Conversion or Form of  Subscription is telecopied
to and received by the Company in accordance with the provisions hereof shall be
deemed a Conversion  Date or Exercise Date, as the case may be. The Company will
transmit the  certificates  representing  the Conversion  Shares and the Warrant
Shares and the newly issued Preferred Stock certificate  representing the number
of shares of  Preferred  Stock which  remains  unconverted,  or the newly issued
Warrant  representing the portion of the Warrant which remains  unexercised,  to
the Purchasers via express  courier within three (3) trading days after the date
on which the Company receives the Original Documentation or make such securities
available to the  Purchasers  at the Company's  transfer  agent within such time
period (the "Delivery Date").

         (b) The Company and the  Purchasers  agree that the Company will comply
with its applicable federal or other tax withholding obligations.

         16. Liquidated Damages for Failure to Deliver.  The Company understands
that a delay beyond the deadline  for  delivery,  specified in Section 15, could
result in economic loss to the Purchaser.  As  compensation to the Purchaser for
such loss, the Company agrees to pay late payments to the Purchaser for the late
issuance of shares  issuable at conversion  or exercise in  accordance  with the
following  schedule (where "No.  Business Days Late" is defined as the number of
business  days beyond three  business  days after  receipt by the Company of the
Original Documentation):

                                          Late Payment for Each $5,000 of
No. Business Days Late                  Original Investment Being Converted
- ----------------------                  -----------------------------------
           2                                        $     50.00
           3                                        $    100.00
           4                                        $    150.00
           5                                        $    200.00
           6                                        $    250.00
           7                                        $    300.00
           8                                        $    350.00
           9                                        $    400.00
          >9                            $400.00 + $100.00 for each Business
                                               Day Late Beyond 9 Days



                                      -17-


         The Company  shall make any  payments  incurred  under this  Section in
immediately   available  funds  upon  demand.   Nothing  herein  shall  limit  a
Purchaser's  right to actual  damages  for the  Company's  failure  to issue and
deliver  the  Conversion  Shares  and  the  Warrant  Shares  to  the  Purchaser.
Furthermore,  in  addition to any other  remedy  which may be  available  to the
Purchaser, in the event that the Company fails for any reason to effect delivery
of Conversion  Shares or Warrant  Shares within five (5) business days after the
date on which the Company has received the Original Documentation, the Purchaser
will be entitled to elect to be deemed to be treated as not having exercised the
relevant  Notice of  Conversion  or Notice of Exercise by delivering a notice to
such effect to the Company whereupon the Company and the Purchaser shall each be
restored  to their  respective  positions  immediately  prior to such  Notice of
Conversion  or  Notice  of  Exercise;  provided  that  no  such  election  shall
constitute  waiver  of any right or remedy  Purchaser  may have and the  Company
shall still be  obligated  notwithstanding  any such  election  to make  penalty
payments hereunder and for any actual damages.

         17.  Non-delivery  of the Shares.  If, within ten (10) business days of
the date after receipt by the Company of the Original Documentation, the Company
shall fail to (i) issue the Conversion  Shares or the Warrant  Shares,  and (ii)
deliver to a Purchaser the  Conversion  Shares or the Warrant Shares as required
by the Warrant or Certificate of Designation, as the case may be, for any reason
other than failure by such Purchaser to comply with its  obligations  under this
Agreement, then the Company shall:

                  (a) hold such Purchaser  harmless  against any loss,  claim or
damage  arising from or as a result of such  failure by the Company  (including,
without limitation,  any such loss, claim or damage resulting from an obligation
to resell the Conversion Shares or the Warrant Shares); and

                  (b)  reimburse  the  Purchaser  for  all of its  out-of-pocket
expenses reasonably  incurred,  including fees and disbursements of its counsel,
incurred by the Purchaser in connection with this Agreement and the transactions
contemplated herein;  provided however,  that the Company shall not have further
liability to the Purchaser except as provided for in this Section 17.

         18. Escrow  Agent.  The Escrow Agent shall not be liable for any action
taken or  omitted  by it in good  faith  and its  liability  hereunder  shall be
limited to liability for gross negligence or willful misconduct on its part. The
Company and the  Purchasers  agree to save  harmless,  and the Company agrees to
indemnify and defend,  the Escrow Agent for,  from and against their  respective
share of any loss, damage, liability,  judgment, cost and expense whatsoever, by
reason of, or on account of, any  misrepresentation  made to it or its status or
activities  as Escrow Agent under this  Agreement  except for any loss,  damage,
liability,  judgment, cost or expense resulting from gross negligence or willful
misconduct on the part of the Escrow Agent.



                                      -18-


                  The Escrow Agent shall not be  responsible  for any failure or
inability of any of the parties to perform or comply with the provisions of this
Agreement, or the agreements delivered in connection herewith.

                  In the performance of its duties  hereunder,  the Escrow Agent
shall be entitled to rely in good faith upon any document  (including  facsimile
transmitted copies of documents), instrument or signature believed by it in good
faith to be  genuine  and to be  signed by any  party  hereto  or an  authorized
officer or agent thereof,  and shall not be required to investigate the truth or
accuracy of any  statement  contained in any such  document or  instrument.  The
Escrow  Agent may assume in good faith  that any person  purporting  to give any
notice in accordance  with the provisions  hereof has been duly authorized to do
so.

                  Each party  hereto  acknowledges  that (a) the Escrow Agent is
not acting as legal counsel to such party in any manner or respect in connection
with the transactions  contemplated by this Agreement,  and (b) the Escrow Agent
is serving as an accommodation to the parties hereto.
                  It is  understood  and further  agreed  that the Escrow  Agent
shall:

                  (a) be under no duty to enforce  payment  of any  subscription
that is to be paid to and held by it hereunder;

                  (b)  promptly  notify the  Purchasers  and the  Company of any
discrepancy  between  the amounts set forth on any  statement  delivered  by the
Purchasers and/or the Company and the sum or sums delivered to it therewith;

                  (c) be  under  no duty to  accept  funds,  checks,  drafts  or
instruments  for the payment of money from anyone  other than the Company or the
Purchasers,  or to give  any  receipt  therefor  except  to the  Company  or the
Purchasers, with a copy in each case to the Company;

                  (d)  be  protected   in  acting  upon  any  notice,   request,
certificate,  approval,  consent or other paper reasonably  believed by it to be
genuine  and to be signed by the  proper  party or parties  (including,  but not
limited to, copies of documents transmitted by facsimile);

                  (e) be permitted  to consult  with counsel of its choice,  and
shall  not be  liable  for any  action  taken,  suffered,  or  omitted  by it in
accordance with the advice of such counsel;  provided,  however, that nothing in
this  subsection  (e), nor any action taken by the Escrow Agent,  or suffered or
omitted by it in  accordance  with the advice of any counsel,  shall relieve the
Escrow  Agent from  liability  for any claims that are  occasioned  by its gross
negligence or willful misconduct;

                  (f) not be bound by any modification,  amendment, termination,
cancellation,  or  rescission  of this  Agreement,  unless  the same shall be in
writing and signed by it;



                                      -19-


                  (g) be entitled to refrain  from taking any action  other than
to keep all property held in escrow if it (i) shall be uncertain  concerning its
duties or rights  hereunder,  or (ii) shall have received claims or demands from
any party, or (iii) shall have received  instructions from the Purchasers and/or
the Company that, in the Escrow Agent's opinion, are in conflict with any of the
provisions of this Agreement, until it shall have received a final judgment by a
court of competent jurisdiction;

                  (h) have no liability for following the instructions herein or
expressly provided for herein, or the written  instructions given jointly by the
Purchasers and/or the Company; and/or

                  (i) have the right, at any time, to resign hereunder by giving
written notice of its resignation to all other parties hereto at least three (3)
business days prior to the date  specified for such  resignation to take effect,
and upon the effective date of such  resignation all cash and other payments and
all other property then held by the Escrow Agent hereunder shall be delivered by
it to such person as may be designated in writing by the other parties executing
this Agreement,  whereupon the Escrow Agent's obligations  hereunder shall cease
and  terminate.  If no  such  person  has  been  designated  by such  date,  all
obligations  of the  Escrow  Agent  hereunder  shall,  nevertheless,  cease  and
terminate.  The Escrow Agent's sole  responsibility  thereafter shall be to keep
safely  all  property  then  held by it and to  deliver  the  same  to a  person
designated by the other parties  executing this Agreement or in accordance  with
the   directions  of  a  final  order  or  judgment  of  a  court  of  competent
jurisdiction.

                [Remainder of page is intentionally left blank.]



                                      -20-







                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            DYNAGEN, INC.

                                            By:      /s/ Dhananjay G. Wadekar
                                                     --------------------------
                                            Title:   Executive Vice President
                                                     --------------------------






                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Ardsen Financial S.A.
                                            -------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ J. Beck
                                                     ----------------------
                                            Title:   President
                                                     ----------------------

                                            Address:   POB 9765
                                                       -----------------------
                                                       Birmensdorferstr. 1Q3
                                                       -----------------------
                                                       8036 Zurich-Switzerland
                                                       -----------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Voica Trading S.A.
                                            -------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     ----------------------
                                            Title:   President
                                                     ----------------------

                                            Address:     Angernenstr. 6
                                                         ------------------
                                                         8002 Zurich
                                                         ------------------
                                                         Switzerland
                                                         ------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            TAIB Bank E.C.
                                            -----------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     --------------------------
                                            Title:   Executive Vice President / 
                                                     Vice President
                                                     --------------------------

                                            Address:     Sohl Centre, Diplomatic
                                                         Area
                                                         -----------------------
                                                         P.O. Box 20485
                                                         -----------------------
                                                         Menema, Bahrain
                                                         -----------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            LAMPTON INC.
                                            ----------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ SPSG
                                                     -------------------
                                            Title:
                                                     -------------------

                                            Address:     Elkana Street
                                                         ---------------------
                                                         P.O. Box 35411
                                                         ---------------------
                                                         Jerusalem, Israel
                                                         ---------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Throne Ltd.
                                            -----------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ Jo Wieng
                                                     --------------------
                                            Title:   General Director
                                                     --------------------

                                            Address:     24 Route de Malacou
                                                         ---------------------
                                                         Geneva 1V08
                                                         ---------------------
                                                         Switzerland
                                                         ---------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Colbo Kft.
                                            -------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     ----------------------
                                            Title:   President
                                                     ----------------------

                                            Address:     Gyeri Vt.
                                                         ------------------
                                                         Sziyetszuitmiklos
                                                         ------------------
                                                         Hungary
                                                         ------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Sovereign Partners L.P.
                                            -----------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     ---------------------------
                                            Title:   President - General Manager
                                                     ---------------------------

                                            Address:     49 Perry Lane
                                                         -----------------------
                                                         Ridgefield, CT  06877
                                                         -----------------------







                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Legong Investments NV
                                            -------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible] or
                                                         I. Sankatsung
                                                     --------------------------
                                            Title:   Director
                                                     --------------------------

                                            Address:     Int. Trade Center
                                                         ----------------------
                                                         TRI26 Curacao
                                                         ----------------------
                                                         Neth. Antilles
                                                         ----------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                           Very truly yours,

                                           RIC Asset Limited
                                           --------------------------------
                                           (exact name of Purchaser)


                                           By:      /s/ Mazen Hassounah
                                                    -----------------------
                                           Title:   Director
                                                    -----------------------

                                           Address: c/o Rana Investment Company
                                                    ---------------------------
                                                    P.O. Box 60168, Riyadh 11545
                                                    ---------------------------
                                                    Saudi Arabia
                                                    ---------------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                          Very truly yours,

                                          The Endeavour Capital Fund S.A.
                                          -----------------------------------
                                          (exact name of Purchaser)


                                          By:      /s/ Shmuli Margullies
                                                   --------------------------
                                          Title:   Director
                                                   --------------------------

                                          Address: c/o Endeavour Management Inc.
                                                   -----------------------------
                                                   14/14 Divrei Chaim St.
                                                   -----------------------------
                                                   Jerusalem 94479 Israel
                                                   -----------------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Gross Foundation Inc.
                                            -------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     ----------------------
                                            Title:   President
                                                     ----------------------

                                            Address:     1660 49 St.
                                                         ------------------
                                                         Brooklyn, NY
                                                         ------------------
                                                         11204
                                                         ------------------





                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Deere Park Capital Management
                                            ---------------------------------
                                            (exact name of Purchaser)


                                            By:      /s/ [Illegible]
                                                     ------------------------
                                            Title:   President
                                                     ------------------------

                                            Address:     650 Dundee Road
                                                         ---------------------
                                                         Suite 460
                                                         ---------------------
                                                         Northbrook, IL  60062
                                                         ---------------------




                                                                    EXHIBIT 4.15

                          REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT"),  dated as of June 16,
1997 by and among  DYNAGEN,  INC.,  a Delaware  corporation,  with  headquarters
located at 99 Erie Street, Cambridge,  Massachusetts 02139 (the "Company"),  and
the  undersigned  parties who execute a counterpart  signature of this Agreement
(together with affiliates, the "INITIAL INVESTORS").

         WHEREAS:

         A. In connection  with the Securities  Purchase  Agreement of even date
herewith by and between the Company and the Initial  Investors (the  "SECURITIES
PURCHASE AGREEMENT"),  the Company has agreed, upon the terms and subject to the
conditions  contained therein, to issue and sell to the Initial Investors Series
A  Preferred  Stock (the  "PREFERRED  STOCK")  that is  convertible  into shares
(collectively,  the  "CONVERSION  SHARES") of the  Company's  common  stock (the
"COMMON STOCK") and Warrants (the "WARRANTS") that are exercisable for shares of
Common  Stock  (the  "WARRANT  SHARES"),  all upon the terms and  subject to the
limitations  and  conditions set forth in the  Certificate  of Designation  with
respect to the Preferred Stock or the Warrants, as applicable; and

         B.  To  induce  the  Initial  Investors  to  execute  and  deliver  the
Securities  Purchase  Agreement,  the  Company  has  agreed to  provide  certain
registration rights under the Securities Act of 1933, as amended,  and the rules
and regulations thereunder, or any similar successor statute (collectively,  the
"1933 ACT");

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  contained  herein  and other  good and  valuable  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the Company and the
Initial Investors hereby agree as follows:

         1.       DEFINITIONS.

                  (a) As used in this Agreement,  the following terms shall have
the following meanings:

                           (i) "INVESTORS"  means the Initial  Investors and any
transferees  or assignees  who agree to become bound by the  provisions  of this
Agreement in accordance with Section 9 hereof.

                           (ii)  "REGISTER,"  "REGISTERED,"  and  "REGISTRATION"
refer  to a  registration  effected  by  preparing  and  filing  a  Registration
Statement or Statements in compliance with the 1933 Act and pursuant to Rule 415
under the 1933 Act or any successor rule providing for offering  securities on a
continuous  basis ("RULE 415"), and the declaration or ordering of effectiveness
of such  Registration  Statement by the United  States  Securities  and Exchange
Commission (the "SEC").







                           (iii)  "POTENTIAL  MATERIAL  EVENT"  means any of the
following:  (a) the possession by the Company of material  information  not ripe
for  disclosure  in a  registration  statement,  which  shall  be  evidenced  by
determinations  in good  faith by the Board of  Directors  of the  Company  that
disclosure  of  such  information  in  the   registration   statement  would  be
detrimental  to the  business  and affairs of the  Company;  or (b) any material
engagement  or  activity  by  the  Company  which  would,   in  the  good  faith
determination of the Board of Directors of the Company, be adversely affected by
disclosure in a registration  statement at such time, which  determination shall
be  accompanied by a good faith  determination  by the Board of Directors of the
Company that the registration  statement would be materially  misleading  absent
the inclusion of such information.

                           (iv)  "REGISTRABLE  SECURITIES"  means the Conversion
Shares and the Warrant Shares issued or issuable and any shares of capital stock
issued or issuable as a dividend on or in exchange for or otherwise with respect
to any of the foregoing.

                           (v)  "REGISTRATION  STATEMENT"  means a  registration
statement of the Company under the 1933 Act.

                  (b)  Capitalized  terms used herein and not otherwise  defined
herein shall have the respective  meanings set forth in the Securities  Purchase
Agreement.

         2.       REGISTRATION.

                  (a)  Mandatory  Registration.  The Company  shall,  as soon as
practicable  after the Closing Date but in no event more than 45 days  following
the Closing Date, file with the SEC a Registration Statement on Form S-3 (or, if
Form S-3 is not then  available,  on such form of  Registration  Statement as is
then available to effect a registration of the Registrable  Securities,  subject
to the consent of the Initial  Investors (as  determined  pursuant to Section l0
hereof), which consent will not be unreasonably withheld conditioned or delayed)
covering the resale of the Registrable  Securities.  The Registration Statement,
to the extent allowable under the 1933 Act and the Rules promulgated  thereunder
(including Rule 416), shall state that such  Registration  Statement also covers
such  indeterminate  number of  additional  shares of Common Stock as may become
issuable upon  conversion of the Preferred Stock and/or exercise of the Warrants
to prevent  dilution  resulting  from stock splits,  stock  dividends or similar
transactions.  The Company shall use its best efforts to cause such registration
to become  and  remain  effective  (including  the  taking of such  steps as are
necessary  to  obtain  the  removal  of any  stop  orders);  provided,  that the
Investors  shall  furnish  the  Company,  within five (5)  business  days of the
Company's  written  request,  with such  appropriate  information  in connection
therewith  (whether  requested prior to or after the filing of the  Registration
Statement with the SEC) as the Company shall reasonably request in writing.  The
Registration  Statement  (and each  amendment or  supplement  thereto,  and each
request for  acceleration  of  effectiveness  thereof) shall be provided to (and
subject to the approval of) the Initial  Investors  and its counsel prior to its
filing or other  submission.  The  number of  shares of Common  Stock  initially
included in such Registration  Statement shall be no less than one hundred fifty
percent (150%) of the shares of Common Stock issuable upon the conversion of the
Preferred  Stock and exercise of the Warrants on the Closing Date  (assuming the



                                      -2-



Conversion  Price  set  forth  in  Section  5(b)(ii)(A)  of the  Certificate  of
Designation).  The Company  further  undertakes  to take all steps  necessary to
ensure  that a  Registration  Statement  is,  or  Registration  Statements  are,
effective at all times during the  Registration  Period (as defined  below) with
respect to all Registrable Securities and the resale thereof.

                  (b)  Eligibility  for Form S-3.  The  Company  represents  and
warrants that, as of the date hereof,  it meets the  requirements for the use of
Form  S-3 for  registration  of the  sale by the  Investors  of the  Registrable
Securities  and the Company  shall file all reports  required to be filed by the
Company with the SEC in a timely manner, and take any and all such other actions
as may be reasonably necessary or appropriate so as to maintain such eligibility
for the use of Form S-3.

         3.       OBLIGATIONS OF THE COMPANY.

         In connection with the registration of the Registrable Securities,  the
Company shall have the following obligations:

                  (a)  The  Company  shall,  as soon as  practicable  after  the
Closing  Date but in no event  more than 45 days  following  the  Closing  Date,
prepare and file promptly with the SEC a  Registration  Statement and thereafter
use its  Best  Efforts  (as  hereinafter  defined)  to cause  such  Registration
Statement relating to Registrable  Securities to promptly become effective,  but
in no event to become  effective  more than 90 days  following the Closing Date,
and to keep the  Registration  Statement  effective  pursuant to Rule 415 at all
times  until  such  date as is the  earlier  of (i) the date on which all of the
Registrable  Securities  have been sold and no shares of Preferred  Stock and no
Warrants  are  outstanding  or (ii)  the date on  which  all of the  Registrable
Securities  (in  the  opinion  of  counsel  to  the  Initial  Investors)  may be
immediately  publicly  sold  without  registration  and (iii) two years from the
Closing  Date  (the  "REGISTRATION   PERIOD"),   which  Registration   Statement
(including  any  amendments or supplements  thereto and  prospectuses  contained
therein and all documents  incorporated by reference  therein) shall not contain
any  untrue  statement  of a  material  fact or omit to  state a  material  fact
required to be stated therein,  or necessary to make the statements  therein not
misleading.  The Company  shall  furnish to the  Investors  copies of reasonably
complete drafts of all such documents proposed to be filed (including  exhibits,
if any),  and any such Investor  shall have the  opportunity  to object,  within
three (3) business days, to any information  pertaining  solely to such Investor
that is contained  therein and the Company will make the corrections  reasonably
requested by such Investor with respect to such information  prior to filing any
such  Registration  Statement  or  amendment.  Any period of review and revision
resulting  from such review that extends  beyond five (5) business days shall be
added to the time in which  the  Registration  Statement  is to be filed  and no
penalty shall be assessed  with respect to such period.  If the Company fails to
cause such  Registration  Statement to become effective within 90 days following
the Closing Date due to a Corporation  Failure, as defined in the Certificate of
Designation, the Conversion Price, as defined in the Certificate of Designation,
shall  be  adjusted  as set  forth  in  paragraph  5(b)  of the  Certificate  of
Designation.  As used in Section 3(a), (b), (d), (f), (i) and (m) hereof,  "Best
Efforts"  shall  include  the  taking  of  any  and  all  actions  necessary  or
appropriate with respect thereto,  including timely



                                      -3-


response to all comments and correspondence  received  (including from the SEC),
the filing or  providing  of any further  drafts and other  documents  as may be
required, and the like.

                  (b) The  Company  shall  prepare  and  file  with the SEC such
amendments  (including   post-effective   amendments)  and  supplements  to  the
Registration   Statement  and  the  prospectus   used  in  connection  with  the
Registration  Statement as may be necessary to keep the  Registration  Statement
effective at all times during the Registration  Period.  Without limiting any of
the  Company's  obligations  under  this  Agreement,  in the event the number of
shares available under a Registration Statement filed pursuant to this Agreement
is insufficient to cover all of the  Registrable  Securities  issued or issuable
upon  conversion of the  Preferred  Stock and/or  exercise of the Warrants,  the
Company  shall  amend the  Registration  Statement,  or file a new  Registration
Statement (on the short form available therefore, if applicable), or both, so as
to  cover  all  of  the  Registrable  Securities,  in  each  case,  as  soon  as
practicable,  but in any  event  within  twenty  (20) days  after the  necessity
therefor  arises  (based  on the  market  price of the  Common  Stock  and other
relevant  factors on which the Company  reasonably  elects to rely). The Company
shall use its Best  Efforts to cause  such  amendment  and/or  new  Registration
Statement to become effective as soon as possible following the filing thereof.

                  (c)  The  Company  shall   furnish  to  each  Investor   whose
Registrable  Securities are included in the Registration Statement and its legal
counsel (i) promptly after the same is prepared and publicly distributed,  filed
with the SEC or received by the Company, one copy of the Registration  Statement
and any amendment thereto,  each preliminary  prospectus and prospectus and each
amendment or supplement thereto, and, in the case of the Registration  Statement
referred to in Section 2(a),  each letter written by or on behalf of the Company
to the SEC or the staff of the SEC,  and each  material  item of  correspondence
from the SEC or the staff of the SEC, in each case relating to such Registration
Statement  (other than any portion  thereof that contains  information for which
the Company has sought confidential  treatment),  and (ii) such number of copies
of a prospectus,  including a preliminary  prospectus,  and all  amendments  and
supplements  thereto and such other  documents as such  Investor may  reasonably
request in order to facilitate  the  disposition of the  Registrable  Securities
owned by such Investor.

                  (d) The Company shall use its Best Efforts to (i) register and
qualify the Registrable  Securities covered by the Registration  Statement under
such other  securities  or "blue sky" laws of such  jurisdictions  in the United
States as the  Investors  who hold a majority  in  interest  of the  Registrable
Securities  being  offered  reasonably  request,  (ii) prepare and file in those
jurisdictions  such  amendments   (including   post-effective   amendments)  and
supplements  to such  registrations  and  qualifications  as may be necessary to
maintain the effectiveness  thereof during the Registration  Period,  (iii) take
such other  actions as may be  necessary,  appropriate  or available to maintain
such  registrations  and  qualifications  in  effect  at all  times  during  the
Registration  Period,  and (iv) take all other actions necessary or advisable to
qualify the  Registrable  Securities for sale in such  jurisdictions;  provided,
however,  that the Company shall not be required in connection therewith or as a
condition  thereto to (a) qualify to do business  in any  jurisdiction  where it
would not  otherwise  be  required  to qualify but for this  Section  3(d),  (b)
subject itself to general taxation in any such jurisdiction,  (c) file a general
consent  to  service  of  process  in any such  jurisdiction,  (d)  provide  any
undertakings  that cause the Company  undue  expense or burden,



                                      -4-


or (e) make any change in its charter or bylaws, which in each case the Board of
Directors of the Company  determines to be contrary to the best interests of the
Company and its  stockholders.  The Company shall promptly  notify each Investor
who  holds  Registrable  Securities  of  the  receipt  by  the  Company  of  any
notification with respect to the suspension of the registration or qualification
of any of the Registrable Securities for sale under the securities or "blue sky"
laws of any jurisdiction in the United States or its receipt of actual notice of
the initiation or threatening of any proceeding for such purpose.

                  (e) Notwithstanding the foregoing, if at any time or from time
to time  after the date of  effectiveness  of the  Registration  Statement,  the
Company  notifies  the  Investors  in writing of the  existence  of a  Potential
Material Event, the Investors shall not offer or sell any Registrable Shares, or
engage in any other transaction involving or relating to the Registrable Shares,
from the time of the giving of notice with respect to a Potential Material Event
until the  earlier  of (i) twenty  (20) days from the  receipt of notice of such
Potential Material Event, or (ii) such Investor receives written notice from the
Company that such  Potential  Material  Event  either has been  disclosed to the
public or no longer constitutes a Potential Material Event;  provided,  however,
that the Company shall use its best efforts to minimize any such  suspension and
under all circumstances the Company may not so suspend the right to such holders
of Registrable  Shares for more than two periods of twenty (20) days each in the
aggregate  during  any  12-month  period  during  the  period  the  Registration
Statement is required to be in effect; and provided,  further,  that there shall
be an interval of no less than 45 days between such two twenty (20) day periods.

                  (f) The  Company  shall use its Best  Efforts to  prevent  the
issuance  of  any  stop  order  or  other   suspension  of  effectiveness  of  a
Registration  Statement,  and,  if  such an  order  is  issued,  to  obtain  the
withdrawal  of such order at the  earliest  possible  moment and to notify  each
Investor  who holds  Registrable  Securities  being sold (or, in the event of an
underwritten  offering, the managing underwriters) of the issuance of such order
and the resolution thereof.

                  (g) For a period  of five (5)  business  days  prior to filing
with the SEC, the Company  shall permit a single firm of counsel  designated  by
the  Initial  Investors  representing  a majority of the  Conversion  Shares and
Warrant  Shares  held  by  the  Initial  Investors  (on an as  converted  and as
exercised  basis) to review the  Registration  Statement and all  amendments and
supplements  thereto.  Any period of review and revision resulting from any such
review that extends  beyond five (5) business days shall be added to the time in
which registration is required to be filed and effective, as appropriate, and no
penalty shall be assessed with respect to such period.

                  (h) The Company shall make available for inspection by (i) any
Investor, (ii) any underwriter  participating in any disposition pursuant to the
Registration Statement,  (iii) one firm of attorneys and one firm of accountants
or  other  agents  retained  by the  Initial  Investors,  and  (iv)  one firm of
attorneys retained by all such underwriters (collectively, the "INSPECTORS") all
pertinent  financial and other records,  and pertinent  corporate  documents and
properties of the Company  (collectively,  the "RECORDS") as shall be reasonably
deemed  necessary by each Inspector to enable each Inspector to exercise its due
diligence  responsibility,  and  cause the  Company's  officers,  directors  and
employees to supply all information  which any Inspector may reasonably



                                      -5-


request  for  purposes  of such due  diligence;  provided,  however,  that  each
Inspector  shall hold in  confidence  and shall not make any  disclosure  of any
Record or other  information  which the Company  determines  in good faith to be
confidential,  and of which determination the Inspectors are so notified, unless
(a)  the  disclosure  of such  Records  is  determined  to be  necessary  by the
Investors and the Company to avoid or correct a misstatement  or omission in any
Registration Statement, (b) the release of such Records is ordered pursuant to a
subpoena  or  other  order  from  a  court  or  government   body  of  competent
jurisdiction,  or (c) the  information  in such Records has been made  generally
available  to the public  other than by  disclosure  in violation of this or any
other agreement.  The Company shall not be required to disclose any confidential
information  in such Records to any  Inspector  until and unless such  Inspector
shall  have  entered  into  confidentiality  agreements  (in form and  substance
satisfactory to the Company) with the Company with respect  thereto,  containing
terms  substantially  similar to those  contained  in this  Section  3(i).  Each
Investor agrees that it shall,  upon learning that disclosure of such Records is
sought  in or by a court  or  governmental  body of  competent  jurisdiction  or
through other means, give prompt notice to the Company and allow the Company, at
its expense,  to undertake  appropriate  action to prevent  disclosure of, or to
obtain a protective order for, the Records deemed  confidential.  Nothing herein
shall be deemed to limit the Investor's  ability to sell Registrable  Securities
in a manner which is otherwise consistent with applicable laws and regulations.

                  (i) The  Company  shall  hold in  confidence  and not make any
disclosure of information  concerning an Investor provided to the Company unless
(i) disclosure of such  information is necessary to comply with federal or state
securities   laws,  or  other  applicable  law,  (ii)  the  disclosure  of  such
information is necessary to avoid or correct a  misstatement  or omission in any
Registration  Statement,  (iii)  the  release  of such  information  is  ordered
pursuant  to a  subpoena  or other  order from a court or  governmental  body of
competent  jurisdiction,  or (iv)  such  information  has  been  made  generally
available  to the public  other than by  disclosure  in violation of this or any
other agreement. The Company agrees that it shall, upon learning that disclosure
of such  information  concerning  an  Investor  is  sought  in or by a court  or
governmental body of competent  jurisdiction or through other means, give prompt
notice to such Investor prior to making such disclosure, and allow the Investor,
at its expense, to undertake  appropriate action to prevent disclosure of, or to
obtain a protective order for, such information.

                  (j) The  Company  shall use its Best  Efforts  to  secure  the
designation  and  quotation  of all the  Registrable  Securities  covered by the
Registration  Statement on the NASDAQ  SmallCap  Market,  if the listing of such
Registrable Securities is then permitted under the rules and regulations of such
market.

                  (k) The Company shall provide a transfer  agent and registrar,
which may be a single  entity,  for the  Registrable  Securities  not later than
sixty (60) days from the Closing Date.

                  (l)  The  Company  shall   promptly   facilitate   the  timely
preparation and delivery of certificates  (not bearing any restrictive  legends)
representing  Registrable  Securities  to be sold  pursuant to the  Registration
Statement and enable such  certificates to be in such  denominations or amounts,
as the case may be, as the managing underwriter or underwriters,  if any, or the
Investors


                                      -6-



may reasonably request and registered in such names as the managing  underwriter
or underwriters, if any, or the Investors may request.

                  (m) The  Company  shall  use its Best  Efforts  to  cause  all
Registrable  Securities covered by such registration  statement to be registered
with or approved by such other  governmental  agencies or  authorities as may be
necessary to enable each holder thereof to consummate disposition of Registrable
Securities.

         4.       OBLIGATIONS OF THE INVESTORS.

         In connection with the registration of the Registrable Securities,  the
Investors shall have the following obligations:

                  (a) It shall be a condition  precedent to the  obligations  of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable  Securities of a particular Investor that such Investor shall
furnish to the Company,  within five (5) business days of the Company's  written
request, such information  regarding itself, the Registrable  Securities held by
it and the intended method of disposition of the Registrable  Securities held by
it  as  shall  be  reasonably  required  to  effect  the  registration  of  such
Registrable  Securities  and shall  execute  within  five (5)  business  days of
receipt by such Investor such documents in connection with such  registration as
the Company may reasonably request.

                  (b)  Each  Investor,  by  such  Investor's  acceptance  of the
Registrable  Securities,  agrees to  cooperate  with the  Company as  reasonably
requested by the Company in connection  with the  preparation  and filing of the
Registration Statement hereunder,  unless such Investor has notified the Company
in  writing  of such  Investor's  election  to  exclude  all of such  Investor's
Registrable Securities from the Registration Statement.

                  (c) Each Investor agrees that, upon receipt of any notice from
the  Company of the  happening  of a  Potential  Material  Event as set forth in
Section  3(e),  such  Investor  will  immediately   discontinue  disposition  of
Registrable  Securities  pursuant to the  Registration  Statement  covering such
Registrable Securities in accordance with Section 3(e).

                  (d) Without limiting an Investor's  rights under Section 2(a),
no Investor may participate in any  underwritten  distribution  hereunder unless
such Investor (i) agrees to sell such Investor's  Registrable  Securities on the
basis  provided in any  underwriting  arrangements  in usual and customary  form
entered into by the Company,  (ii)  completes  and executes all  questionnaires,
powers of attorney,  indemnities,  underwriting  agreements and other  documents
reasonably required under the terms of such underwriting arrangements, and (iii)
agrees to pay its pro rata share of all  underwriting  discounts and commissions
and any expenses in excess of those payable by the Company pursuant to Section 5
below.

                  (e) Each Investor whose Registrable Securities are included in
a Registration Statement understands that the 1933 Act may require delivery of a
prospectus relating thereto in connection with any sale thereof pursuant to such
Registration  Statement and each such  Investor



                                      -7-


shall use its reasonable  best efforts to comply with the applicable  prospectus
delivery requirements of the 1933 Act in connection with any such sale.

                  (f) Each Investor agrees to notify the Company  promptly,  but
in any  event  within  seventy-two  (72)  hours  after  the  date on  which  all
Registrable  Securities  owned by such Investor have been sold by such Investor,
so that the Company may comply with its obligation to terminate the Registration
Statement in accordance  with Item 512 of Regulation  S-K or Regulation  S-B, as
the case may be.

         5.       EXPENSES OF REGISTRATION.

         All  reasonable  expenses,   other  than  underwriting   discounts  and
commissions,   incurred   in   connection   with   registrations,   filings   or
qualifications pursuant to Sections 2 and 3, including all registration, listing
and  qualifications  fees,  printers  and  accounting  fees  and  the  fees  and
disbursements  of counsel for the Company,  shall be borne by the  Company.  All
fees and disbursements of counsel to the holders of Registrable Securities,  any
expenses incurred as a result of any investigation pursuant to Section 3(h), any
underwriting  discounts and  commissions  and all other expenses of such holders
not  contained  in the  previous  sentence  shall  be borne  by the  holders  of
Registrable Securities.

         6.       INDEMNIFICATION.

         In the event any Registrable  Securities are included in a Registration
Statement under this Agreement:

                  (a)  To  the  extent   permitted  by  law,  the  Company  will
indemnify,  hold  harmless  and  defend  (i) each  Investor  who is a seller  of
Registrable Securities under the Registration Statement, and (ii) the directors,
officers,  partners,  employees,  agents and each person who  controls  any such
Investor  within the meaning of the 1933 Act or the  Securities  Exchange Act of
1934, as amended (the "1934 ACT"),  if any,  (each,  an  "INDEMNIFIED  PERSON"),
against any joint or several losses,  claims,  damages,  liabilities or expenses
(collectively, together with actions, proceedings or inquiries by any regulatory
or  self-regulatory  organization,  whether commenced or threatened,  in respect
thereof,  "CLAIMS") to which any of them may become  subject under the 1933 Act,
the 1934 Act or  otherwise,  insofar as any such Claim arises out of or is based
upon: (i) any untrue statement or alleged untrue statement of a material fact in
a Registration  Statement or the omission or alleged omission to state therein a
material fact required to be stated or necessary to make the statements  therein
not  misleading or (ii) any untrue  statement or alleged  untrue  statement of a
material  fact  contained  in any  preliminary  prospectus  if used prior to the
effective  date  of such  Registration  Statement,  or  contained  in the  final
prospectus  (as  amended or  supplemented,  if the Company  files any  amendment
thereof or supplement  thereto with the SEC) or the omission or alleged omission
to state  therein  any  material  fact  necessary  to make the  statements  made
therein,  in light of the circumstances  under which the statements therein were
made, not misleading  (the matters in the foregoing  clauses (i) and (ii) being,
collectively,  "VIOLATIONS").  Subject to the  restrictions set forth in Section
6(c) with respect to the number of legal  counsel,  the Company shall  reimburse
the Investors and each such underwriter or controlling



                                      -8-



person,  promptly as such expenses are incurred and are due and payable, for any
reasonable  legal  fees  or  other  reasonable  expenses  incurred  by  them  in
connection  with  investigating  or  defending  any such Claim.  Notwithstanding
anything  to  the  contrary  contained  herein,  the  indemnification  agreement
contained in this Section 6(a): (i) shall not apply to a Claim arising out of or
based upon a Violation  which  occurs in reliance  upon and in  conformity  with
information  furnished  in writing  to the  Company  by any  Indemnified  Person
expressly  for  use in  connection  with  the  preparation  of the  Registration
Statement,  preliminary prospectus or final prospectus, or any amendment thereof
or supplement thereto; (ii) shall not apply to amounts paid in settlement of any
Claim if such  settlement is effected  without the prior written  consent of the
Company,  which  consent  shall not be  unreasonably  withheld;  and (iii)  with
respect to any  preliminary  prospectus,  shall not inure to the  benefit of any
Indemnified  Person  if the  untrue  statement  or  omission  of  material  fact
contained in the  preliminary  prospectus was corrected on a timely basis in the
prospectus,  as then amended or supplemented,  if such corrected  prospectus was
timely made  available  by the Company  pursuant to Section  3(c)  hereof.  Such
indemnity shall remain in full force and effect  regardless of any investigation
made by or on behalf of the Indemnified Person and shall survive the transfer of
the   Registrable   Securities   by  the   Investors   pursuant  to  Section  9.
Notwithstanding  anything to the contrary  contained  herein,  any Investor that
does not fulfill its obligations under Sections 2(a), 3(a) or 4(a) hereof within
the period of time specified in such Sections shall not be an Indemnified Person
and shall not be entitled to indemnification pursuant to this Section 6.

                  (b) In connection with any Registration  Statement in which an
Investor is  participating,  each such Investor agrees severally and not jointly
to  indemnify,  hold  harmless  and  defend,  to the same extent and in the same
manner set forth in Section 6(a), the Company,  each of its  directors,  each of
its  officers who signs the  Registration  Statement,  each person,  if any, who
controls the Company within the meaning of the 1933 Act or the 1934 Act, and any
other stockholder selling securities  pursuant to the Registration  Statement or
any of its  directors  or officers or any person who controls  such  stockholder
within  the  meaning  of  the  1933  Act  or  the  1934  Act  (collectively,  an
"INDEMNIFIED PARTY"), against any Claim to which any of them may become subject,
under the 1933 Act, the 1934 Act or otherwise,  insofar as such Claim arises out
of or is based upon any  Violation,  in each case to the extent (and only to the
extent)  that such  Violation  occurs in reliance  upon and in  conformity  with
written information  furnished to the Company by such Investor expressly for use
in connection with such Registration Statement,  preliminary prospectus or final
prospectus,  or any amendment or supplement thereto; and subject to Section 6(c)
such  Investor  will  reimburse  any legal or other  expenses  (promptly as such
expenses are incurred  and are due and payable)  reasonably  incurred by them in
connection with  investigating or defending any such Claim;  provided,  however,
that the indemnity  agreement  contained in this Section 6(b) shall not apply to
amounts paid in settlement of any Claim if such  settlement is effected  without
the  prior  written  consent  of  such  Investor,  which  consent  shall  not be
unreasonably withheld;  provided,  further,  however, that the Investor shall be
liable under this Agreement (including this Section 6(b) and Section 7) for only
that amount as does not exceed the net proceeds to such  Investor as a result of
the sale of Registrable Securities pursuant to such Registration Statement. Such
indemnity shall remain in full force and effect  regardless of any investigation
made by or on behalf of such Indemnified Party and shall survive the transfer of
the   Registrable   Securities   by  the   Investors   pursuant  to  Section  9.
Notwithstanding  anything to the



                                      -9-


contrary  contained  herein,  the  indemnification  agreement  contained in this
Section 6(b) with respect to any preliminary  prospectus  shall not inure to the
benefit of any Indemnified Party if the untrue statement or omission of material
fact contained in the preliminary  prospectus was corrected on a timely basis in
the prospectus, as then amended or supplemented.

                  (c)  Promptly  after  receipt  by  an  Indemnified  Person  or
Indemnified  Party  under this  Section 6 of notice of the  commencement  of any
action  (including  any  governmental   action),   such  Indemnified  Person  or
Indemnified Party shall, if a Claim in respect thereof is to be made against any
indemnifying  party under this  Section 6, deliver to the  indemnifying  party a
written notice of the commencement  thereof,  and the  indemnifying  party shall
have the right to participate in, and, to the extent the  indemnifying  party so
desires,  jointly with any other indemnifying party similarly noticed, to assume
control  of the  defense  thereof  with  counsel  mutually  satisfactory  to the
indemnifying  party and the Indemnified  Person or the Indemnified Party, as the
case may be; provided,  however, that an Indemnified Person or Indemnified Party
shall have the right to retain its own counsel  with the fees and expenses to be
paid by the  indemnifying  party,  if,  in the  reasonable  opinion  of  counsel
retained by the indemnifying  party, the  representation  by such counsel of the
Indemnified  Person or  Indemnified  Party and the  indemnifying  party would be
inappropriate  due to actual  or  potential  differing  interests  between  such
Indemnified  Person or Indemnified Party and any other party represented by such
counsel  in such  proceeding.  The  indemnifying  party  shall  pay for only one
separate legal counsel for the Indemnified  Persons or the Indemnified  Parties,
as applicable,  and such legal counsel shall be selected by Investors  holding a
majority-in-interest  of the Registrable Securities included in the Registration
Statement  to  which  the  Claim  relates,  if the  Investors  are  entitled  to
indemnification  hereunder,  or the  Company,  if the  Company  is  entitled  to
indemnification  hereunder, as applicable. The failure to deliver written notice
to the  indemnifying  party within a reasonable time of the  commencement of any
such action shall not relieve such  indemnifying  party of any  liability to the
Indemnified  Person or  Indemnified  Party  under this  Section 6, except to the
extent  that the  indemnifying  party is actually  prejudiced  in its ability to
defend such action. The indemnification required by this Section 6 shall be made
by  periodic   payments  of  the  amount   thereof  during  the  course  of  the
investigation or defense, as such expense, loss, damage or liability is incurred
and is due and payable.

         7.       CONTRIBUTION.

         To  the  extent  any   indemnification  by  an  indemnifying  party  is
prohibited or limited by law, the indemnifying  party agrees to make the maximum
contribution  with respect to any amounts for which it would otherwise be liable
under Section 6 to the fullest extent permitted by law; provided,  however, that
(i) no contribution shall be made under  circumstances where the maker would not
have been  liable for  indemnification  under the fault  standards  set forth in
Section  6, (ii) no  seller  of  Registrable  Securities  guilty  of  fraudulent
misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be
entitled to  contribution  from any person who was not guilty of such fraudulent
misrepresentation,  and (iii) contribution (together with any indemnification or
other obligations under this Agreement) by any seller of Registrable  Securities
shall be limited in amount to the amount of  proceeds  received  by such  seller
from the sale of such Registrable Securities.



                                      -10-



         8.       REPORTS UNDER THE 1934 ACT.

         With a view to making  available to the  Investors the benefits of Rule
144  promulgated  under the 1933 Act or any other  similar rule or regulation of
the SEC that may at any time  permit the  Investors  to sell  securities  of the
Company to the public without registration ("RULE 144"), the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144;

                  (b) file with the SEC in a timely manner all reports and other
documents required of the Company under the 1933 Act and the 1934 Act so long as
the filing of such  reports and other  documents is required for the sale of the
Registrable Securities pursuant to Rule 144; and

                  (c)  furnish to each  Investor so long as such  Investor  owns
Registrable  Securities,  promptly upon request,  (i) a written statement by the
Company that it has complied  with the reporting  requirements  of Rule 144, the
1933 Act and the 1934 Act,  (ii) a copy of the most recent  annual or  quarterly
report of the  Company  and such other  reports  and  documents  so filed by the
Company,  and (iii) such other  information  as may be  reasonably  requested to
permit  the  Investors  to sell such  securities  pursuant  to Rule 144  without
registration.

         9.       ASSIGNMENT OF REGISTRATION RIGHTS.

         The rights of an Investor  hereunder,  including  the right to have the
Company register  Registrable  Securities  pursuant to this Agreement,  shall be
automatically  assignable by each Investor to any  transferee of at least 30% of
the Preferred Stock and/or Warrants, or Registrable  Securities of such Investor
if (i) the Investor  agrees in writing with the transferee or assignee to assign
such rights,  and a copy of such  agreement is furnished to the Company within a
reasonable time after such assignment,  (ii) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (a) the
name and address of such  transferee or assignee,  and (b) the  securities  with
respect to which such  registration  rights are being  transferred  or assigned,
(iii)  following  such transfer or assignment,  the further  disposition of such
securities by the  transferee  or assignee is restricted  under the 1933 Act and
applicable  state  securities  laws,  (iv) at or  before  the time  the  Company
receives the written notice  contemplated  by clause (ii) of this sentence,  the
transferee or assignee  agrees in writing with the Company to be bound by all of
the  provisions  contained  herein,  (v) such  transfer  shall have been made in
accordance  with  the  applicable   requirements  of  the  Securities   Purchase
Agreement,  and (vi) such transferee  shall be an "accredited  investor" as that
term defined in Rule 501 of Regulation D promulgated under the 1933 Act.

         10.      AMENDMENT OF REGISTRATION RIGHTS.

         Provisions of this Agreement may be amended and the observance  thereof
may  be  waived  (either  generally  or  in a  particular  instance  and  either
retroactively  or  prospectively),  only with



                                      -11-


written  consent  of the  Company  and  Investors  who hold at least  80% of the
Registrable Securities. Any amendment or waiver effected in accordance with this
Section 10 shall be binding upon each Investor and the Company.

         11.      MISCELLANEOUS.

                  (a) A person or entity is deemed to be a holder of Registrable
Securities  whenever  such  person or entity  owns of  record  such  Registrable
Securities.  If  the  Company  receives  conflicting  instructions,  notices  or
elections  from  two or more  persons  or  entities  with  respect  to the  same
Registrable  Securities,  the Company shall act upon the basis of  instructions,
notice  or  election  received  from the  registered  owner of such  Registrable
Securities.

                  (b) Notices  required or permitted to be given hereunder shall
be in  writing  and shall be deemed to be  sufficiently  given  when  personally
delivered (by hand, by courier,  by telephone  line  facsimile  transmission  or
other means) or sent by facsimile or overnight courier,

         If to the Company, to:

                  DynaGen, Inc.
                  99 Erie Street
                  Cambridge, MA  02139
                  Attention:  President

                  Telephone:        (617) 491-2527
                  Telecopy:         (617) 354-3902

if to the  Initial  Investors  as set  forth  on  Schedule  I to the  Securities
Purchase  Agreement,  or at such other  address as each such party  furnishes by
notice given in accordance with this Section 11(b), and shall be effective, when
personally  delivered,  upon receipt and, when so sent by facsimile or overnight
courier.

                  (c) Failure of any party to exercise any right or remedy under
this  Agreement or otherwise,  or delay by a party in  exercising  such right or
remedy, shall not operate as a waiver thereof

                  (d)  This  Agreement  shall  be  enforced,   governed  by  and
construed in  accordance  with the laws of the State of Delaware  applicable  to
agreements  made and to be performed  entirely  within such State.  In the event
that any  provision  of this  Agreement  is invalid or  unenforceable  under any
applicable  statute  or  rule  of law,  then  such  provision  shall  be  deemed
inoperative  to the extent that it may  conflict  therewith  and shall be deemed
modified to conform with such statute or rule of law. Any provision hereof which
may prove invalid or  unenforceable  under any law shall not affect the validity
or enforceability of any other provision hereof. Each of the parties consents to
the jurisdiction of the federal courts whose districts encompass any part of the
City of New York or the state  courts of the  State of New York  sitting  in the
City of New York in connection with any dispute arising under this Agreement and
hereby waives, to the



                                      -12-


maximum extent permitted by law, any objection, including any objection based on
forum  non  conveniens,   to  the  bringing  of  any  such  proceeding  in  such
jurisdictions.

                  (e)  This  Agreement  and the  Securities  Purchase  Agreement
(including all schedules and exhibits  thereto)  constitute the entire agreement
among the parties  hereto with respect to the subject matter hereof and thereof.
There are no  restrictions,  promises,  warranties or  undertakings,  other than
those set forth or  referred  to herein  and  therein.  This  Agreement  and the
Securities  Purchase Agreement supersede all prior agreements and understandings
among the parties hereto with respect to the subject matter hereof and thereof.

                  (f)  Subject to the  requirements  of  Section 9 hereof,  this
Agreement  shall inure to the benefit of and be binding upon the  successors and
assigns of each of the parties hereto.

                  (g) The  headings in this  Agreement  are for  convenience  of
reference only and shall not limit or otherwise affect the meaning hereof.

                  (h)  This   Agreement   may  be   executed   in  two  or  more
counterparts,  each of which shall be deemed an original  but all of which shall
constitute one and the same agreement. This Agreement, once executed by a party,
may be delivered to the other party hereto by facsimile  transmission  of a copy
of this  Agreement  bearing  the  signature  of the  party  so  delivering  this
Agreement.

                  (i) Each party shall do and  perform,  or cause to be done and
performed,  all such further acts and things,  and shall execute and deliver all
such other  agreements,  certificates,  instruments and documents,  as the other
party may reasonably request in order to carry out the intent and accomplish the
purposes of this Agreement and the consummation of the transactions contemplated
hereby.

                  (j) All  consents and other  determinations  to be made by the
Investors  pursuant to this Agreement  shall be made by the Investors  holding a
majority of the Registrable Securities (determined as if all shares of Preferred
Stock  and  Warrants  then   outstanding   had  been   converted  or  exercised,
respectively, into Registrable Securities).

                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]



                                      -13-





                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            DYNAGEN, INC.

                                            By:     /s/ Dhananjay G. Wadekar
                                                    --------------------------
                                            Title:  Executive Vice President
                                                    --------------------------




                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Ardsen Financial S.A.
                                            ----------------------------------
                                            (print exact name of Investor)

                                            By:    /s/ J. Beck
                                                   -----------------------------
                                            Title: President
                                                   -----------------------------





                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Voica Trading S.A.
                                            -------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     ----------------------
                                            Title:   President
                                                     ----------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            TAIB Bank E.C.
                                            ----------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     --------------------------
                                            Title:   Executive Vice President /
                                                     Vice President
                                                     --------------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            LAMPTON INC.
                                            ------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ SDSG
                                                     ---------------------
                                            Title:   Director
                                                     ---------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            THRONE LTD.
                                            ---------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ Jo Wiengo
                                                     ------------------------
                                            Title:   General Director
                                                     ------------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Colbo Kft.
                                            ------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     ------------------
                                            Title:   President
                                                     ------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Sovereign Partners L.P.
                                            ----------------------------------
                                            (print exact name of Investor)

                                            By:    /s/ [ILLEGIBLE]
                                                   ---------------------------
                                            Title: President - General Partner
                                                   ---------------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Legong Investments N.V.
                                            ---------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     ------------------------
                                            Title:   Director
                                                     ------------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            RIC Asset Limited
                                            -------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ Mazen Hassounah
                                                     ----------------------
                                            Title:   Director
                                                     ----------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            The Endeavour Capital Fund S.A.
                                            --------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ Shmuli Margulies
                                                     -----------------------
                                            Title:   Director
                                                     -----------------------






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Gross Foundation Inc.
                                            ---------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     ------------------------
                                            Title:   President
                                                     ------------------------








                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Deere Park Capital Management
                                            ----------------------------------
                                            (print exact name of Investor)

                                            By:      /s/ [ILLEGIBLE]
                                                     -------------------------
                                            Title:   President
                                                     -------------------------



                                                                    EXHIBIT 4.16

         THE  SECURITY  REPRESENTED  HEREBY  HAS NOT BEEN  REGISTERED  UNDER THE
SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE  STATE  SECURITIES LAWS. THIS
SECURITY  MAY  NOT  BE  SOLD,  ASSIGNED  OR  TRANSFERRED  WITHOUT  AN  EFFECTIVE
REGISTRATION  STATEMENT FOR SUCH SECURITY  UNDER THE  SECURITIES ACT OF 1933, AS
AMENDED,  OR APPLICABLE STATE  SECURITIES LAWS,  UNLESS THE COMPANY HAS RECEIVED
THE  WRITTEN  OPINION OF COUNSEL  SATISFACTORY  TO THE  COMPANY  THAT SUCH SALE,
ASSIGNMENT OR TRANSFER DOES NOT INVOLVE A TRANSACTION REQUIRING  REGISTRATION OF
SUCH SECURITY UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE STATE
SECURITIES LAWS.


WARRANT NO.:  W-CS- ________             RIGHT TO PURCHASE __________________
JUNE 18, 1997                            SHARES OF COMMON STOCK OF DYNAGEN, INC.

                   VOID UNLESS EXERCISED BEFORE JUNE 18, 1999


                                  DYNAGEN, INC.

                          COMMON STOCK PURCHASE WARRANT

         DYNAGEN, INC., a Delaware corporation (the "COMPANY"), hereby certifies
that,  in  consideration  of the  investment  by  _____________  (the  "HOLDER")
pursuant to the Securities  Purchase Agreement dated the date hereof, the Holder
is entitled,  subject to and in  accordance  with the terms set forth below,  to
purchase from the Company,  commencing  on the date hereof,  at any time or from
time  to time  before  5:00  P.M.  Eastern  Standard  Time  on  June  18,  1999,
____________  fully paid and  non-assessable  shares of Common  Stock,  $.01 par
value,  of the  Company,  at an  exercise  price per share  equal to one hundred
twenty  percent  (120%) of the  average of the  closing  bid price of the Common
Stock of the  Company  as  reported  by the  Nasdaq  SmallCap  Market  or Nasdaq
National  Market or, if the Common Stock is no longer  traded on a Nasdaq market
such other  exchange on which the Common Stock is then traded,  for the five (5)
trading days immediately preceding the date on which the Securities and Exchange
Commission  declares  effective  the  registration  statement to be filed by the
Company under the Securities Act of 1933, as amended,  to register the shares of
Common Stock  issuable  upon  exercise of this Warrant in  accordance  with that
certain Registration Rights Agreement dated as of the date hereof. Such exercise
price per share as adjusted from time to time as herein  provided is referred to
herein as the  "EXERCISE  PRICE".  The number and  character  of such  shares of
Common  Stock and the  Exercise  Price are  subject to  adjustment  as  provided
herein.

         As used  herein  the  following  terms,  unless the  context  otherwise
requires, have the following respective meanings:

         (a) The term "COMPANY" means DynaGen, Inc., a Delaware corporation, and
any  corporation  that  succeeds  or  assumes  the  obligations  of the  Company
hereunder.




                                      -2-



         (b) The term "COMMON STOCK" means (a) the Company's Common Stock,  $.01
par value per share, as authorized,  (b) any other capital stock of any class or
classes (however  designated) of the Company,  authorized on or after such date,
the  holders of which  shall have the right,  without  limitation  as to amount,
either to all or to a share of the balance of current  dividends and liquidating
dividends  after the  payment  of  dividends  and  distributions  on any  shares
entitled  to  preference,  and the  holders of which  shall  ordinarily,  in the
absence of contingencies,  be entitled to vote for the election of a majority of
directors of the Company (even though the right so to vote has been suspended by
the happening of such a contingency), (c) any other securities into which or for
which  any of the  securities  described  in (a)  or  (b)  may be  converted  or
exchanged pursuant to a plan of recapitalization,  reorganization,  merger, sale
of  assets  or  otherwise,  or the  conversion  of  promissory  notes  or  other
obligations of the Company.

         (c) The term  "OTHER  SECURITIES"  means any stock  (other  than Common
Stock) and other  securities  of the Company or any other person  (corporate  or
otherwise)  which the holder of this  Warrant at any time shall be  entitled  to
receive,  or shall have received,  on the exercise of the Warrant, in lieu of or
in  addition  to Common  Stock,  or which at any time shall be issuable or shall
have been  issued in exchange  for or in  replacement  of Common  Stock or Other
Securities pursuant to Sections 3 or 4 or otherwise.

         1.       EXERCISE OF WARRANT.

                  1.1. FULL  EXERCISE.  This Warrant may be exercised in full by
the holder  hereof by surrender of this Warrant,  with the form of  subscription
attached  hereto duly  executed by such holder,  to the Company at its principal
office,  accompanied by payment,  in cash or by certified or official bank check
payable to the order of the Company,  in the amount  obtained by multiplying the
number of shares of Common Stock for which this Warrant is then  exercisable  by
the Exercise Price then in effect.

                  1.2. PARTIAL  EXERCISE.  This Warrant may be exercised in part
by surrender of this Warrant in the manner and at the place  provided in Section
1.1 except that the amount payable by the holder on such partial  exercise shall
be the amount  obtained by multiplying  (a) the number of shares of Common Stock
designated  by the  holder  in the  subscription  at the end  hereof  by (b) the
Exercise Price then in effect. On any such partial exercise,  the Company at its
expense  will  forthwith  issue and  deliver  to or upon the order of the holder
hereof a new Warrant or Warrants of like tenor, in the name of the holder hereof
or as such holder (upon payment by such holder of any applicable transfer taxes)
may  request,  calling in the  aggregate  on the face or faces  thereof  for the
number of shares of Common Stock for which such Warrant or Warrants may still be
exercised.

         2. DELIVERY OF STOCK  CERTIFICATES ON EXERCISE.  As soon as practicable
after the exercise of this  Warrant in full or in part,  and in any event within
three (3)  trading  days after the Company  receives  (i) the  original  Form of
Subscription  properly  completed,  (ii) the original  Warrant and (iii) payment
pursuant to Section 1.1 above, the Company at its expense (including the payment
by it of any applicable  issue taxes) will cause to be issued in the name of and
delivered to the holder  hereof,  or as such holder (upon payment by such holder
of any applicable  transfer taxes) may direct, a certificate or certificates for
the number of fully  paid and  non-assessable  shares of



                                      -3-


Common  Stock (or Other  Securities)  to which such holder  shall be entitled on
such exercise,  plus, in lieu of any fractional share to which such holder would
otherwise  be  entitled,  cash  equal to such  fraction  multiplied  by the then
current market value of one full share.  The exercise date of this Warrant shall
be the date on  which  the  Company  receives  the  properly  completed  Form of
Subscription attached hereto by telecopier or otherwise.

         3.       ADJUSTMENT FOR REORGANIZATION, CONSOLIDATION OR MERGER.

                  3.1.  REORGANIZATION,  CONSOLIDATION OR MERGER. In case at any
time or from time to time,  the Company shall (a) effect a  reorganization,  (b)
consolidate  with or merge into any other person or entity,  or (c) transfer all
or  substantially  all of its capital  stock,  properties or assets to any other
person  under  any plan or  arrangement  contemplating  the  dissolution  of the
Company,  then, in each such case,  the holder of this Warrant,  on the exercise
hereof as  provided  in  Section 1 at any time  after the  consummation  of such
reorganization,   consolidation   or  merger  or  the  effective  date  of  such
dissolution,  as the case may be,  shall  receive,  upon the proper and rightful
exercise  of this  Warrant,  in lieu of the Common  Stock (or Other  Securities)
issuable on such exercise prior to such consummation or such effective date, the
stock and other  securities and property  (including  cash) to which such holder
would have been  entitled  upon such  consummation  or in  connection  with such
dissolution,  as the case may be, if such holder had so exercised  this Warrant,
immediately  prior  thereto,  all subject to further  adjustment  thereafter  as
provided in Sections 4 and 5.

                  3.2.  CONTINUATION OF TERMS. Upon any corporate event referred
to in this Section 3, this Warrant  shall  continue in full force and effect and
the terms hereof shall be applicable to the shares of stock and Other Securities
and property  receivable on the exercise of this Warrant after the  consummation
of such  reorganization,  consolidation or merger, as the case may be, and shall
be binding upon the issuer of any such stock or other securities.

         4. ADJUSTMENTS FOR STOCK DIVIDENDS AND STOCK SPLITS.  In the event that
the Company shall (i) issue additional  shares of the Common Stock as a dividend
or  other   distribution  on  outstanding   Common  Stock,  (ii)  subdivide  its
outstanding  shares of Common Stock, or (iii) combine its outstanding  shares of
the Common Stock into a smaller  number of shares of the Common Stock,  then, in
each such event, the Exercise Price shall,  simultaneously with the happening of
such event, be adjusted by multiplying  the then prevailing  Exercise Price by a
fraction,  the  numerator of which shall be the number of shares of Common Stock
outstanding  immediately prior to such event (calculated assuming the conversion
or exchange of all outstanding shares of convertible or exchangeable  securities
of the Company which are convertible or exchangeable  into, or exercisable  for,
shares of Common  Stock)  and the  denominator  of which  shall be the number of
shares of Common  Stock  outstanding  immediately  after such event  (calculated
assuming the conversion or exchange of all outstanding  shares of convertible or
exchangeable  securities of the Company which are  convertible  or  exchangeable
into, or  exercisable  for,  shares of Common Stock) and the product so obtained
shall thereafter be the Exercise Price then in effect. The Exercise Price, as so
adjusted,  shall be  readjusted  in the same  manner upon the  happening  of any
successive  event or events  described  herein in this  Section 4. The holder of
this Warrant shall thereafter,  on the exercise hereof as provided in Section 1,
be  entitled  to receive  that number of shares of Common  Stock  determined  by
multiplying  the number of shares of Common Stock which would



                                      -4-


otherwise  (but  for the  provisions  of this  Section  4) be  issuable  on such
exercise,  by a fraction of which (i) the numerator is the Exercise  Price which
would  otherwise  (but for the  provisions of this Section 4) be in effect,  and
(ii)  the  denominator  is the  Exercise  Price  in  effect  on the date of such
exercise.

         5.   ADJUSTMENT   FOR   DIVIDENDS   IN  OTHER   STOCK,   PROPERTY   AND
RECLASSIFICATIONS.  In case at any time or from  time to time,  the  holders  of
Common  Stock (or Other  Securities)  shall have  received,  or (on or after the
record date fixed for the  determination  of  stockholders  eligible to receive)
shall have become entitled to receive, without payment therefor,

                  (a) other or additional  stock or other securities or property
(other than cash) by way of dividend, or

                  (b) other or additional  stock or other securities or property
(including   cash)   by   way   of   spin-off,    split-up,    reclassification,
recapitalization, combination of shares or similar corporate rearrangement,

other than additional shares of Common Stock (or Other  Securities)  issued as a
stock dividend or in a stock-split (adjustments in respect of which, in the case
of Common Stock,  are provided for in Section 4), then and in each such case the
holder of this Warrant,  on the exercise  hereof as provided in Section 1, shall
be  entitled  to  receive  the  amount  of other or  additional  stock and other
securities and property  (including cash in the cases referred to in subdivision
(b) of this Section 5) which such holder would hold on the date of such exercise
if on the  date of  distribution  of such  other  or  additional  stock or other
securities  and  property,  or on the  record  date  fixed for  determining  the
shareholders  entitled  to  receive  such  other  or  additional  stock or other
securities and property, such holder had been the holder of record of the number
of  shares  of  Common  Stock  called  for on the face of this  Warrant  and had
thereafter, during the period from the date thereof to and including the date of
such exercise,  retained such shares and all such other or additional  stock and
other  securities  and  property  (including  cash in the cases  referred  to in
subdivision (b) of this Section 5) receivable by such holder as aforesaid during
such period,  giving effect to all adjustments  called for during such period by
Sections 3 and 4.

         6.       NOTICES OF RECORD DATE.  In the event of

                  (a) any taking by the  Company  of a record of the  holders of
any class or securities for the purpose of determining  the holders  thereof who
are  entitled to receive any  dividend  or other  distribution,  or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, or

                  (b)  any   capital   reorganization   of  the   Company,   any
reclassification  or recapitalization of the capital stock of the Company or any
transfer  of  all  or  substantially  all  the  assets  of  the  Company  to  or
consolidation or merger of the Company with or into any other person, or




                                      -5-



                  (c) any voluntary or involuntary  dissolution,  liquidation or
winding-up of the Company,

then and in each such event the  Company  will mail or cause to be mailed to the
holder of this Warrant a notice specifying (i) the date on which any such record
is to be taken for the  purpose of such  dividend,  distribution  or right,  and
stating the amount and character of such dividend,  distribution  or right,  and
(ii)   the   date  on   which   any   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, dissolution, liquidation or
winding-up is to take place,  and the time,  if any is to be fixed,  as of which
the holders of record of Common Stock (or Other Securities) shall be entitled to
exchange  their shares of Common Stock (or Other  Securities)  for securities or
other   property   deliverable   on   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, dissolution, liquidation or
winding-up.  Such notice  shall be mailed at least twenty (20) days prior to the
date specified in such notice on which any such action is to be taken.

         7.  RESERVATION OF STOCK  ISSUABLE ON EXERCISE OF WARRANT.  The Company
will at all times reserve and keep  available,  solely for issuance and delivery
on the  exercise of the  Warrant,  all shares of Common  Stock from time to time
issuable on the exercise of all of the then outstanding Warrants, and the shares
of Common Stock which the holder of this Warrant  shall receive upon exercise of
the  Warrant  will  be  duly   authorized,   validly  issued,   fully  paid  and
non-assessable.

         8.  EXCHANGE OF WARRANT.  On surrender  for  exchange of this  Warrant,
properly  endorsed,  to the  Company,  the Company at its expense will issue and
deliver to or on the order of the holder  thereof a new  Warrant or  Warrants of
like  tenor,  in the name of such  holder or as such  holder (on payment by such
holder of any applicable transfer taxes) may direct, calling in the aggregate on
the face or faces thereof for the number of shares of Common Stock called for on
the face or faces of the Warrant or Warrants so surrendered.

         9.   REPLACEMENT  OF  WARRANT.   On  receipt  of  evidence   reasonably
satisfactory  to the Company of the loss,  theft,  destruction  or mutilation of
this Warrant  and, in the case of any such loss,  theft or  destruction  of this
Warrant,   on  delivery  of  an  indemnity   agreement  or  security  reasonably
satisfactory  in form and  amount  to the  Company  or,  in the case of any such
mutilation,  on surrender and  cancellation of such Warrant,  the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

         10.  WARRANTHOLDER  NOT DEEMED  STOCKHOLDER;  RESTRICTIONS ON TRANSFER.
This Warrant is issued upon the following  terms, to all of which each holder or
owner hereof by the taking hereof consents and agrees:

                  (a) Except as otherwise  expressly  set forth in Sections 3, 4
and 5 with respect to computing  adjustments  with respect hereto,  no holder of
this Warrant  shall,  as such,  be deemed the holder of Common Stock that may at
any time be issuable upon  exercise of this Warrant for any purpose  whatsoever,
nor shall anything  contained herein be construed to confer upon such holder, as
such,  any of the rights of a stockholder of the Company until such holder shall
have  delivered



                                      -6-


formal notice to the Company of an intention to exercise this Warrant,  tendered
promptly the  consideration  required for exercise (whether cash or securities),
exercised the Warrant, and been issued shares of Common Stock in accordance with
the provisions hereof.

                  (b) This  Warrant is not  transferable  or  assignable  to any
party other than an affiliate of the Holder without the prior written consent of
the  Company.  A holder that wishes to  transfer  or assign this  Warrant  shall
provide to the Company an opinion of counsel  satisfactory  to the Company  that
such transfer is permissible under applicable law.

         11.  REGISTRATION  RIGHTS.  The Company  shall  register  the shares of
Common Stock issuable upon exercise of this Warrant in accordance with the terms
of the Registration Rights Agreement dated as of the date hereof.

         12. NOTICES.  All notices and other  communications from the Company to
the  holder of this  Warrant  shall be sent by (i)  first  class  mail,  postage
prepaid,  (ii) electronic  facsimile  transmission,  or (iii) express  overnight
courier service,  at such address or facsimile number as may have been furnished
to the Company in writing by such holder or, until any such holder  furnishes to
the  Company an  address or  facsimile  number,  then to, and at the  address or
facsimile  number of, the last holder of this  Warrant who has so  furnished  an
address to the Company.

         13.  MISCELLANEOUS.  This  Warrant  and any term hereof may be changed,
waived,  discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought.  This Warrant and the shares of Common Stock  underlying this Warrant
shall be construed and enforced in  accordance  with and governed by the laws of
the State of Delaware.  The  invalidity  or  unenforceability  of any  provision
hereof  shall in no way  affect  the  validity  or  enforceability  of any other
provision.

Dated: June 18, 1997                          DYNAGEN, INC.

ATTEST:

By:    /s/ Dennis R. Bilodeau                 By:     /s/ Dhananjay G. Wadekar
       ------------------------                      -------------------------
Title: Controller                             Title:  Executive Vice President
       ------------------------                      -------------------------









                              FORM OF SUBSCRIPTION
                   (TO BE SIGNED ONLY ON EXERCISE OF WARRANT)


TO DynaGen, Inc.

         The undersigned,  the holder of the within Warrant,  hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, ........ shares
of Common Stock of DynaGen,  Inc., a Delaware  corporation,  and herewith  makes
payment of $........  therefor,  and  requests  that the  certificates  for such
shares be issued in the name of, and delivered to ..............,  whose address
is ................................

Dated:
                          (Signature must conform to name of holder as specified
                          on the face of the Warrant)


                                    (Address)

                              --------------------

                               FORM OF ASSIGNMENT
                   (TO BE SIGNED ONLY ON TRANSFER OF WARRANT)


         For  value  received,   the  undersigned  hereby  sells,  assigns,  and
transfers unto .................. the right represented by the within Warrant to
purchase  .............  shares of Common  Stock of  DynaGen,  Inc.,  a Delaware
corporation,    to   which   the   within   Warrant   relates,    and   appoints
 ..........................  Attorney  to  transfer  such  right on the  books of
DynaGen,  Inc., a Delaware  corporation,  with full power of substitution in the
premises.


Dated:
                          (Signature must conform to name of holder as specified
                          on the face of the Warrant)


                                    (Address)

Signed in the presence of:



                                                                    EXHIBIT 4.17

                                  DYNAGEN, INC.

                    CERTIFICATE OF DESIGNATIONS, PREFERENCES

                     AND RIGHTS OF SERIES B PREFERRED STOCK

         The undersigned officers of DYNAGEN,  INC., a corporation organized and
existing under the General  Corporation Law of the State of Delaware,  do hereby
certify  that,   pursuant  to  authority   conferred  by  the   Certificate   of
Incorporation, as amended to date, and pursuant to the provisions of Section 151
of the General Corporation Law of the State of Delaware,  the Board of Directors
of DynaGen,  Inc., on June 16, 1997, adopted a resolution  providing for certain
powers, designations, preferences and relative, participating, optional or other
special rights, and the qualifications,  limitations or restrictions thereof, of
certain shares of Series B Preferred Stock,  $.01 par value, of the Corporation,
which resolution is as follows:

    RESOLVED:       That,  pursuant  to the  authority  vested  in the  Board of
                    Directors  of the  Corporation  and in  accordance  with the
                    General  Corporation  Law of the State of  Delaware  and the
                    provisions    of   the    Corporation's    Certificate    of
                    Incorporation,  a series  of 7,500  shares  of the  class of
                    authorized Preferred Stock, par value $.01 per share, of the
                    Corporation  is hereby  created  as the  Series B  Preferred
                    Stock, and that the designation and number of shares thereof
                    and  the  voting  powers,   designations,   preferences  and
                    relative, participating, optional or other special rights of
                    the  shares  of  such   series,   and  the   qualifications,
                    limitations  or  restrictions  thereof,  are as set forth on
                    Exhibit A attached hereto.

         EXECUTED as of this 16th day of June, 1997.

                                           DYNAGEN, INC.


                                           By:      /s/ Dhananjay G. Wadekar
                                                    ----------------------------
                                                    Dhananjay G. Wadekar,
                                                    Executive Vice President and
                                                    Chairman of the Board
ATTEST:


/s/ Kenneth J. Gordon
- -----------------------------
Kenneth J. Gordon
Assistant Secretary










                                    EXHIBIT A


A.       DESCRIPTION AND DESIGNATION OF SERIES B PREFERRED STOCK

         1.       DESIGNATION AND DEFINITIONS.

                  (A) DESIGNATION.  A total of 7,500 shares of the Corporation's
previously  undesignated Preferred Stock, $.01 par value, shall be designated as
the "Series B Preferred  Stock" and authorized for issuance.  The original issue
price per share of the Series B Preferred  Stock shall be $99.70 (the  "SERIES B
ORIGINAL ISSUE PRICE").

                  (B) CERTAIN DEFINITIONS.  As used herein, the following terms,
unless the context otherwise requires, have the following respective meanings:

                           "COMMON   STOCK"   means  the  common  stock  of  the
Corporation, $.01 par value.

                           "DIVIDEND PAYMENT DATE" is defined in Section 2(a).

                           "SEC" means the United States Securities and Exchange
Commission.

                           "SERIES B AVERAGE  QUOTED PRICE" means the average of
the closing bid price of the Common Stock of the  Corporation as reported by the
Nasdaq SmallCap Market for the five (5) trading days  immediately  preceding any
holder's Series B Conversion  Date,  Dividend Payment Date or Series B Mandatory
Conversion Date, as applicable.

                           "SERIES B  CONVERSION  DATE" means each date on which
the Corporation  receives by telecopy  written notice in accordance with Section
5(j) hereof from a holder of Series B Preferred Stock that such holder elects to
convert shares of its Series B Preferred Stock, provided that if the Corporation
does not receive the original certificate(s) representing the shares of Series B
Preferred Stock being converted together with an originally executed copy of the
notice  of  conversion  within  two  (2)  trading  days  after  receipt  of such
telecopied notice, then the date on which the Corporation receives such original
certificate(s)  and notice shall be the Series B Conversion Date with respect to
such conversion.

                           "SERIES B  CONVERSION  PRICE" is  defined  in Section
5(b).

                           "SERIES B EFFECTIVE  PRICE"  means the average of the
closing  bid price of the Common  Stock of the  Corporation  as  reported by the
Nasdaq SmallCap Market for the five (5) trading days  immediately  preceding the
date on which the SEC declares effective the Series B Registration Statement.

                           "SERIES B ISSUE  DATE"  means,  with  respect to each
share of Series B  Preferred  Stock  held by any  holder,  the date on which the
Corporation  originally  issued such


                                      -2-


share  to  such  holder  (irrespective  of  any  subsequent  transfer  or  other
disposition of such share to any other holder).

                           "SERIES  B  LIQUIDATION  PREFERENCE"  is  defined  in
Section 3(a).

                           "SERIES B REGISTRATION  RIGHTS  AGREEMENT"  means the
Registration   Rights   Agreement   between  the  Corporation  and  the  initial
purchaser(s) of the Series B Preferred Stock.

                           "SERIES   B   REGISTRATION   STATEMENT"   means   the
registration  statement to be filed by the Corporation  under the Securities Act
of 1933,  as  amended,  to register  the shares of Common  Stock  issuable  upon
conversion of the Series B Preferred  Stock in accordance  with the terms of the
Series B Registration Rights Agreement.

                           "SERIES B STATED  DIVIDEND"  is  defined  in  Section
2(a).

         2.       DIVIDENDS.

                  (A) STATED DIVIDEND. Commencing on the Series B Issue Date and
continuing thereafter,  each holder of Series B Preferred Stock will be entitled
to receive a dividend of Seven Dollars  ($7.00) per share per annum (the "SERIES
B STATED DIVIDEND"). The Series B Stated Dividend will accrue daily on the basis
of a 360-day year of twelve 30-day months,  whether or not the  Corporation  has
earnings or surplus, and the dividend payable to the holder of a share of Series
B Preferred  Stock on the first Dividend  Payment Date after the share is issued
will be the accrued  dividend  from the day the share is issued to the  Dividend
Payment Date.  The Series B Stated  Dividend will be payable in shares of Common
Stock in  accordance  with  Section  2(c) on the last trading day of each fiscal
quarter  of the  Corporation  (a  "DIVIDEND  PAYMENT  DATE").  Series  B  Stated
Dividends  shall be cumulative and to the extent not previously  paid,  shall be
paid  upon   conversion,   liquidation,   dissolution,   or  winding-up  of  the
Corporation, whether or not earned or declared.

                  (B) PAYMENT OF ACCRUED DIVIDENDS UPON CONVERSION, LIQUIDATION,
DISSOLUTION,  OR Winding-Up.  On each Series B Conversion Date and each Series B
Mandatory  Conversion Date, all Series B Stated Dividends accrued since the last
Dividend Payment Date with respect to the converted shares of Series B Preferred
Stock shall be paid to the holder of record of such converted shares. All Series
B Stated Dividends  accrued since the last Dividend Payment Date with respect to
any outstanding share of Series B Preferred Stock shall be paid to the holder of
record  thereof  upon  the  liquidation,   dissolution,  or  winding-up  of  the
Corporation.

                  (C) PAYMENT IN COMMON  STOCK.  The  Corporation  shall pay the
Series B Stated Dividends in shares of Common Stock at the then Series B Average
Quoted Price as of the relevant Dividend Payment Date.

                  (D) FRACTIONAL SHARES.  Notwithstanding anything herein to the
contrary,  no fractional  shares shall be issued pursuant to this Section 2, and
the number of shares of Common



                                      -3-


Stock issued upon the payment of the Series B Stated  Dividend  shall be rounded
up to the nearest whole share.

                  (E)  DECLARED  DIVIDENDS.  If the  Board  of  Directors  shall
declare  a cash  dividend  payable  upon the then  outstanding  shares of Common
Stock,  the  holders of the Series B  Preferred  Stock  shall be entitled to the
amount of cash  dividends  on the Series B Preferred  Stock as would be declared
payable on the  largest  number of whole  shares of Common  Stock into which the
shares  of  Series  B  Preferred  Stock  held by each  holder  thereof  could be
converted pursuant to the provisions of Section 5 hereof, such number determined
as of the record date for the  determination of holders of Common Stock entitled
to receive such cash dividend,  provided that the Series B Preferred Stock shall
rank as to dividends junior to the Series A Preferred Stock. Such  determination
of "whole shares" shall be based upon the aggregate number of shares of Series B
Preferred  Stock  held by each  holder,  and not upon  each  share  of  Series B
Preferred Stock so held by the holder.

         3.       LIQUIDATION, DISSOLUTION OR WINDING UP.

                  (A) TREATMENT AT  LIQUIDATION,  DISSOLUTION  OR WINDING UP. In
the event of any  liquidation,  dissolution  or winding  up of the  Corporation,
whether voluntary or involuntary, or in the event of its insolvency,  before any
distribution  or  payment is made to any  holders  of Common  Stock or any other
class or series of capital stock of the  Corporation  designated to be junior to
the  Series B  Preferred  Stock,  and  subject  to the  liquidation  rights  and
preferences  of the Series A  Preferred  Stock and any other  class or series of
Preferred Stock designated by the Board of Directors,  after the date hereof and
in accordance  with the  provisions of Section 4(b) hereof,  to be senior to the
Series B Preferred Stock with respect to liquidation preferences, the holders of
each share of Series B Preferred Stock shall be entitled to be paid first out of
the  assets of the  Corporation  available  for  distribution  to holders of the
Corporation's  capital  stock of all  classes,  whether such assets are capital,
surplus or earnings,  an amount  equal to the Series B Original  Issue Price per
share of Series B Preferred  Stock held by any holder,  plus all Series B Stated
Dividends  that have become due but have not been paid,  and all accrued but not
yet due dividends,  to the date of final  distribution  (whether  earned or not)
(the  "SERIES B  LIQUIDATION  PREFERENCE").  For purposes  hereof,  the Series B
Preferred  Stock  shall rank on  liquidation  junior to the  Series A  Preferred
Stock.

                  If,  upon  liquidation,  dissolution  or  winding  up  of  the
Corporation,  the  assets  of the  Corporation,  or  proceeds  of those  assets,
available for distribution to the holders of the Series B Preferred Stock and of
the  shares  of  all  other  classes  or  series  that  are  on a  parity  as to
distributions  on  liquidation  with  the  Series  B  Preferred  Stock  are  not
sufficient to pay in full the preferential  amount required to be distributed to
the holders of the Series B Preferred  Stock and of all other  classes or series
that  are on a parity  as to  distributions  on  liquidation  with the  Series B
Preferred  Stock,  then the assets,  or the proceeds of those  assets,  that are
available for distribution to the holders of Series B Preferred Stock and of the
shares of all other  classes or series that are on a parity as to  distributions
on  liquidation  with the Series B Preferred  Stock will be  distributed  to the
holders of the Series B Preferred  Stock and of the shares of all other  classes
or  series  that are on a parity as to  distributions  on  liquidation  with the
Series B Preferred Stock ratably in



                                      -4-


accordance with the respective amount of the Series B liquidation preferences of
the shares held by each of them.  After payment of the full amount of the Series
B Liquidation  Preference  (including  accumulated  unpaid dividends and accrued
dividends) and  accumulated  and accrued  dividends to which holders of Series B
Preferred  Stock are entitled,  the holders of Series B Preferred Stock will not
be entitled to any further  distribution of assets of the  Corporation.  For the
purposes of this Section,  neither a consolidation  or merger of the Corporation
with  another  corporation,  nor a sale or  transfer  of all or any  part of the
Corporation's  assets for cash or securities,  will be considered a liquidation,
dissolution, or winding-up of the Corporation.

                  (B) DISTRIBUTIONS  OTHER THAN CASH. Whenever the distributions
provided for in this Section shall be payable in property  other than cash,  the
value of such  distribution  shall be the fair market value of such  property as
determined in good faith by the Board of Directors.

         4.       VOTING POWER.

                  (A) GENERAL.  Except as otherwise  expressly  provided in this
Section 4 or as otherwise  required by the General  Corporation Law of the State
of Delaware,  each holder of Series B Preferred  Stock shall be entitled to vote
on all  matters  and shall be  entitled  to that  number  of votes  equal to the
largest  number of whole shares of Common Stock into which such holder's  shares
of Series B Preferred  Stock could be converted,  pursuant to the  provisions of
Section 5 hereof,  at the  record  date for the  determination  of  stockholders
entitled to vote on any matter or, if no such record date is established, at the
date such vote is taken or any written  consent of  stockholders  is  solicited.
Except as otherwise required by law, the holders of shares of Series B Preferred
Stock and Common Stock shall vote together (or render  written  consents in lieu
of a vote) as a single class on all matters submitted to the stockholders of the
Corporation.

                  Such  determination  of "whole shares" shall be based upon the
aggregate number of shares of Series B Preferred Stock held by each holder,  and
not upon each share of Series B Preferred Stock so held by the holder.

                  (B)  AMENDMENTS.  While any shares of Series B Preferred Stock
are outstanding,  the Corporation will not, directly or indirectly, or through a
merger or consolidation with any other corporation, without the affirmative vote
at a meeting or the written consent of the holders of at least a majority of the
outstanding  shares of Series B  Preferred  Stock,  (i) create or  increase  the
authorized  number of shares of any class or series of stock ranking prior to or
on a parity with the Series B Preferred  Stock  either as to  dividends  or upon
liquidation;  provided,  however  that,  without  the  consent of the holders of
Series B Preferred  Stock, the Corporation may issue up to (x) $2,000,000 in any
class or series of stock ranking senior to the Series B Preferred  Stock and (y)
$3,000,000 in any class or series of stock ranking on a parity with the Series B
Preferred Stock,  (ii) create or increase the authorized  shares of any class or
series of stock that  entitles the holder to vote in the election of  directors,
other than (x)  Common  Stock or (y)  securities  that are  convertible  into or
exchangeable  for  shares of Common  Stock,  that are voted  with  regard to the
election of directors together with the Common Stock and that do not entitle the
holders  to cast more than one vote for each  share of Common  Stock  into which
those securities may be converted, or for which they may be exchangeable,  (iii)
amend,   alter,   or  repeal



                                      -5-


any of the  provisions of the  Certificate  of  Incorporation  or By-laws of the
Corporation,  or of this resolution,  so as to affect adversely the preferences,
special  rights or powers of the Series B Preferred  Stock,  (iv)  authorize any
reclassification  of the Series B Preferred  Stock,  (v) require the exchange of
Series B  Preferred  Stock for other  securities  (whether  or not issued by the
Corporation)  or  assets,  or (vi)  increase  the  number  of shares of Series B
Preferred  Stock that the  Corporation  is authorized to issue  pursuant to this
resolution.

         5.       CONVERSION RIGHTS.

                  (A) OPTIONAL CONVERSION. No shares of Series B Preferred Stock
held by any holder  shall be  convertible  by such  holder  prior to one hundred
fifty  (150) days after the Series B Issue Date to such  holder.  Beginning  one
hundred fifty (150) days after the Series B Issue Date to such holder, each such
holder of Series B  Preferred  Stock  shall  have the  right,  at such  holder's
option,  to convert  during any five (5) trading day period not more than twenty
percent  (20%) of the shares of Series B Preferred  Stock  originally  issued or
transferred  to the  holder,  into such  number of fully paid and  nonassessable
shares of Common  Stock as shall be  determined  by  multiplying  the  number of
shares of Series B Preferred Stock to be converted by a fraction,  the numerator
of which is the Series B Original Issue Price,  and the  denominator of which is
the applicable Series B Conversion Price (as defined below).

                  (B)  CONVERSION  PRICE.  The  conversion  price per share (the
"SERIES B CONVERSION PRICE") shall be equal to the lesser of subsections (i) and
(ii) below.

                           (i) One  hundred  twenty-five  percent  (125%) of the
Series B Effective Price.

                           (ii) (A)  Beginning on the 150th day after the Series
B Issue Date and ending on the 180th day after the Series B Issue  Date,  eighty
percent (80%) of the Series B Average Quoted Price;

                                (B)  Beginning on the 181st day after the Series
B Issue  Date and  ending  on the  270th  day  after  the  Series B Issue  Date,
seventy-eight percent (78%) of the Series B Average Quoted Price;

                                (C)  Beginning on the 271st day after the Series
B Issue Date and ending on the second  anniversary  of the Series B Issue  Date,
seventy-five percent (75%) of the Series B Average Quoted Price.

                  (C)  MANDATORY  CONVERSION.  On the date that is two (2) years
from a Series B Issue  Date to any  holder  of  Series B  Preferred  Stock  (the
"SERIES B  MANDATORY  CONVERSION  DATE"),  all shares of the Series B  Preferred
Stock then held by such  holder and  issued on such  Series B Issue Date  shall,
without any action on the part of such holder,  be automatically  converted into
such number of fully paid and  nonassessable  shares of Common Stock as shall be
determined by multiplying  the number of shares of Series B Preferred Stock then
held by such holder and issued on such  Series B Issue Date by a  fraction,  the
numerator of which



                                      -6-


is the  Series  B  Original  Issue  Price  and the  denominator  of which is the
applicable Series B Conversion Price.

                  (D)   LIMITATION   ON   NUMBER   OF   SHARES.    Additionally,
notwithstanding  anything  set forth in this  Section 5 to the  contrary,  in no
event  shall any  holder  of Series B  Preferred  Stock,  prior to the  Series B
Mandatory  Conversion Date, be entitled to convert Series B Preferred Stock into
shares  of  Common  Stock to the  extent  that (x) the  number  of shares of the
Corporation's  Common Stock beneficially owned by such holder and its affiliates
(other than shares of Common Stock that may be deemed beneficially owned through
the  ownership  of the  unconverted  portion of the shares of Series B Preferred
Stock  held by such  holder)  plus (y) the  number of  shares  of  Common  Stock
issuable upon such conversion would result in beneficial ownership by the holder
or any person  controlling  the holder of more than 4.9% of the shares of Common
Stock then outstanding.  For purposes of this Section 5(d), beneficial ownership
shall be determined in accordance with Section 13(d) of the Securities  Exchange
Act of 1934, as amended, and Regulation 13D and 13G promulgated thereunder. Each
holder shall, upon delivering to the Corporation a notice of election to convert
shares of Series B Preferred  Stock in accordance  with Section 5(j) hereof,  be
required to provide the Corporation with a completed  certificate in the form of
Annex 1 hereto.  If the holder  cannot  make such  certification,  the shares of
Series  B  Preferred   Stock  to  be   converted   shall  not  be   convertible.
Notwithstanding the foregoing,  upon the Series B Mandatory Conversion Date, all
such shares of Series B Preferred Stock then outstanding shall be converted into
Common Stock in accordance with Section 5(c) hereof.

                  (E)  EQUITABLE  ADJUSTMENT.  If  the  Corporation  (i)  pays a
dividend  or makes a  distribution  on its Common  Stock in shares of its Common
Stock,  (ii)  subdivides its  outstanding  Common Stock into a greater number of
shares, or (iii) combines its outstanding  Common Stock into a smaller number of
shares,  the Series B Conversion Price in effect immediately prior to that event
will be  adjusted  so that the  holder  of a share of Series B  Preferred  Stock
surrendered for conversion after that event will receive the number of shares of
Common  Stock of the  Corporation  which the holder  would have  received if the
share of Series B  Preferred  Stock had been  converted  immediately  before the
happening  of the event (or, if there is more than one such event,  if the share
of Series B Preferred Stock had been converted  immediately  before the first of
those  events  and the  holder  had  retained  all the  Common  Stock  or  other
securities or assets received after the conversion). An adjustment made pursuant
to this  Subparagraph  5(e) will become effective  immediately  after the record
date  in  the  case  of a  dividend  or  distribution,  except  as  provided  in
Subparagraph  5(h), and will become  effective  immediately  after the effective
date  in  the  case  of a  subdivision  or  combination.  If  such  dividend  or
distribution is declared but is not paid or made, the Series B Conversion  Price
then in effect will be appropriately readjusted.  However, a readjustment of the
Series B  Conversion  Price will not affect any  conversion  which  takes  place
before the readjustment.

                  (F) DIVIDENDS OTHER THAN COMMON STOCK DIVIDENDS.  In the event
the  Corporation  shall  make or  issue,  or  shall  fix a  record  date for the
determination of holders of Common Stock entitled to receive a dividend or other
distribution  (other than a distribution  in  liquidation or other  distribution
otherwise  provided for herein) with respect to the Common Stock



                                      -7-


payable in (i) securities of the Corporation  other than shares of Common Stock,
or (ii) other assets  (excluding cash dividends or  distributions),  then and in
each such  event  provision  shall be made so that the  holders  of the Series B
Preferred Stock shall receive upon conversion  thereof in addition to the number
of shares of Common Stock receivable thereupon, the number of securities or such
other assets of the Corporation that they would have received had their Series B
Preferred  Stock been  converted into Common Stock on the date of such event and
had they  thereafter,  during  the  period  from  the date of such  event to and
including the Series B Conversion  Date,  retained such securities or such other
assets  receivable by them during such period,  giving  application to all other
adjustments  called for during such period  under this Section 5 with respect to
the rights of the holders of the Series B Preferred Stock.

                  (G)  CAPITAL  REORGANIZATION,  ETC.  If  there  is  a  capital
reorganization,  recapitalization,  reclassification,  or change of  outstanding
shares of Common  Stock  (other than a change in par value,  or as a result of a
subdivision or  combination),  or a merger or  consolidation  of the Corporation
with any other entity that results in a  reclassification,  change,  conversion,
exchange,  or cancellation  of outstanding  shares of Common Stock, or a sale or
transfer of all or substantially all of the assets of the Corporation,  upon any
subsequent  conversion of Series B Preferred Stock,  each holder of the Series B
Preferred  Stock will be entitled to receive the kind and amount of  securities,
cash and other  property  which the holder would have received if the holder had
converted the shares of Series B Preferred  Stock into Common Stock  immediately
before the first of those events and had retained all the  securities,  cash and
other assets received as a result of all those events.

                  (H)  DEFERRALS.  In any case in which this  Section 5 provides
that an adjustment will become effective  immediately after a record date for an
event,  the  Corporation may defer until the occurrence of the event (i) issuing
to the  holder of any  share of Series B  Preferred  Stock  converted  after the
record  date and before the  occurrence  of the event the  additional  shares of
Common Stock issuable upon the  conversion by reason of the adjustment  over and
above the Common Stock issuable upon the conversion  before giving effect to the
adjustment;  and (ii)  paying to the holder  any cash in lieu of any  fractional
share pursuant to Subsection 5(k).

                  (I) CERTIFICATE AS TO ADJUSTMENTS;  NOTICE BY CORPORATION.  In
each case of an adjustment or  readjustment  of the type described in Paragraphs
(e),  (f),  (g), or (h) of this Section 5, the  Corporation  at its expense will
furnish each holder of Series B Preferred  Stock so affected  with a certificate
prepared  by  an  officer  of  the  Corporation,   showing  such  adjustment  or
readjustment,  and  stating in detail the facts  upon which such  adjustment  or
readjustment is based.

                  (J)  EXERCISE  OF  CONVERSION   PRIVILEGE.   To  exercise  its
conversion  privilege,  a holder of Series B Preferred  Stock shall give written
notice by telecopy to the  Corporation at its principal  office that such holder
elects to convert  shares of its Series B  Preferred  Stock and,  within two (2)
trading days  thereafter,  shall surrender the  certificate(s)  representing the
shares being converted to the Corporation at its principal  office together with
an  originally  executed  copy of such notice.  Such notice shall also state the
name or names (with address or addresses) in which the certificate(s) for shares
of Common Stock issuable upon such conversion shall be issued.  The reverse side
of the  certificate(s)  for shares of Series B Preferred  Stock  surrendered


                                      -8-


for  conversion   shall  be  completed  and  executed  by  the  holder  or  such
certificate(s)  shall be accompanied by other proper  assignment  thereof to the
Corporation  or in  blank.  As  promptly  as  practicable  after  the  Series  B
Conversion  Date,  but in no event  more than three (3)  trading  days after the
Series B Conversion  Date, the Corporation  shall issue and shall deliver to the
holder of the shares of Series B  Preferred  Stock  being  converted,  or on its
written  order,  such  certificate(s)  as it may request for the number of whole
shares of Common Stock  issuable upon the  conversion of such shares of Series B
Preferred  Stock in accordance  with the provisions of this Section 5, and cash,
as provided  in Section  5(k),  in respect of any  fraction of a share of Common
Stock issuable upon such  conversion.  Such  conversion  shall be deemed to have
been  effected  immediately  prior to the  close  of  business  on the  Series B
Conversion  Date,  and at such time the  rights  of the  holder as holder of the
converted  shares of Series B Preferred  Stock shall cease and the  person(s) in
whose  name(s) any  certificate(s)  for shares of Common Stock shall be issuable
upon such  conversion  shall be deemed to have become the holder(s) of record of
the shares of Common Stock  represented  thereby.  If the  Corporation  fails to
issue and deliver to such holder such  certificate(s) for shares of Common Stock
within  three  (3)  trading  days  after  the  Series  B  Conversion  Date,  the
Corporation  shall pay the liquidated  damages set forth in Section 18, and make
the  payments  required  by Section  19, of the  Securities  Purchase  Agreement
between the Corporation  and the initial  purchaser(s) of the Series B Preferred
Stock with respect to the sale and issuance of the Series B Preferred Stock.

                  (K) CASH IN LIEU OF FRACTIONAL SHARES. No fractional shares of
Common Stock or scrip  representing  fractional  shares shall be issued upon the
conversion  of shares of Series B  Preferred  Stock.  Instead of any  fractional
shares of Common  Stock that would  otherwise  be issuable  upon  conversion  of
Series B Preferred Stock, the Corporation  shall pay to the holder of the shares
of Series B Preferred Stock being converted a cash adjustment in respect of such
fractional  shares in an amount  equal to the same  fraction of the market price
per share of the Common Stock (as determined in a reasonable  manner  prescribed
by the Board of  Directors)  at the close of business on the Series B Conversion
Date. The  determination as to whether or not any fractional shares are issuable
shall be based upon the aggregate  number of shares of Series B Preferred  Stock
being  converted at any one time by any holder  thereof,  not upon each share of
Series B Preferred Stock being converted.

                  (L) PARTIAL  CONVERSION.  In the event some but not all of the
shares of Series B Preferred Stock  represented by a certificate(s)  surrendered
by a holder are converted,  the  Corporation  shall execute and deliver to or on
the order of the holder,  at the expense of the  Corporation,  a new certificate
representing  the  number of shares of Series B  Preferred  Stock  that were not
converted.

                  (M) RESERVATION OF COMMON STOCK. The Corporation  shall at all
times reserve and keep available out of its  authorized  but unissued  shares of
Common Stock,  solely for the purpose of effecting the  conversion of the shares
of the Series B Preferred  Stock,  such number of its shares of Common  Stock as
shall  from  time  to  time  be  sufficient  to  effect  the  conversion  of all
outstanding  shares of the Series B  Preferred  Stock  (including  any shares of
Series B Preferred Stock represented by any warrants,  options,  subscription or
purchase rights for the Series B Preferred Stock), and if at any time the number
of  authorized  but unissued  shares of



                                      -9-


Common  Stock  shall not be  sufficient  to effect  the  conversion  of all then
outstanding  shares of the Series B  Preferred  Stock  (including  any shares of
Series B Preferred Stock represented by any warrants, options,  subscriptions or
purchase rights for the Series B Preferred Stock), the Corporation shall use all
reasonable  efforts and take such  action as may be  necessary  to increase  its
authorized but unissued shares of Common Stock to such number of shares as shall
be sufficient for such purpose.

         6. STATUS.  Upon any  conversion,  exchange or  redemption of shares of
Series B  Preferred  Stock,  the  shares of Series B  Preferred  Stock  that are
converted,  exchanged,  or  redeemed  will  have the  status of  authorized  and
unissued shares of preferred  stock, and the number of shares of preferred stock
that the  Corporation  will have authority to issue will not be decreased by the
conversion,  exchange or redemption of shares of Series B Preferred  Stock,  but
the number of shares of Series B Preferred Stock that the Corporation  will have
authority  to issue will be  reduced  so that the  shares of Series B  Preferred
Stock that were converted, exchanged, or redeemed may not be re-issued.

         7.       NOTICES OF RECORD DATE.  In the event of any:

                  (A) taking by the  Corporation  of a record of the  holders of
any class of securities for the purpose of determining  the holders  thereof who
are  entitled to receive any  dividend  or other  distribution,  or any right to
subscribe for,  purchase or otherwise acquire any shares of capital stock of any
class or any other securities or property, or to receive any other right, or

                  (B)   capital   reorganization   of   the   Corporation,   any
reclassification  or  recapitalization  of the capital stock of the Corporation,
any  merger or  consolidation  of the  Corporation,  or any  transfer  of all or
substantially all of the assets of the Corporation to any other Corporation,  or
any other entity or person, or

                  (C)  voluntary  or  involuntary  dissolution,  liquidation  or
winding up of the Corporation,

then and in each such event the Corporation  shall mail or cause to be mailed to
each  holder of Series B  Preferred  Stock a notice  specifying  (i) the date on
which  any  such  record  is to be  taken  for the  purpose  of  such  dividend,
distribution or right and a description of such dividend, distribution or right,
(ii)   the   date  on   which   any   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, dissolution, liquidation or
winding up is expected to become effective,  and (iii) the time, if any, that is
to be  fixed,  as to when the  holders  of  record  of  Common  Stock  (or other
securities) shall be entitled to exchange their shares of Common Stock (or other
securities)   for   securities   or  other   property   deliverable   upon  such
reorganization,  reclassification,  recapitalization,  transfer,  consolidation,
merger,  dissolution,  liquidation or winding up. Such notice shall be mailed by
first class mail, postage prepaid,  or by express overnight courier service,  at
least ten (10) days  prior to the date  specified  in such  notice on which such
action is to be taken.



                                      -10-


         8.       MISCELLANEOUS.

                  (A)  The  headings  of  the  various   subdivisions   of  this
resolution  are for  convenience  only  and  will  not  affect  the  meaning  or
interpretation of any of the provisions of this resolution.

                  (B) The preferences, special rights, or powers of the Series B
Preferred  Stock  may be  waived,  and any of the  provisions  of the  Series  B
Preferred Stock may be amended, only by the affirmative vote at a meeting or the
written  consent of holders of record of at least a majority of the  outstanding
shares of Series B Preferred Stock.








                                     ANNEX I


                             CONVERSION CERTIFICATE


                                     [Date]


DynaGen, Inc.
99 Erie Street
Cambridge, MA  02139

Dear Sir or Madam:

         The  undersigned  holder of the Series B Preferred Stock (the "Holder")
of DynaGen,  Inc. (the  "Company") has submitted a notice of election to convert
_____  shares of the  Company's  Series B  Preferred  Stock.  The Holder  hereby
certifies  that the  conversion of such shares of Series B Preferred  Stock will
not result in the Holder holding more than 4.9% of the outstanding shares of the
Company's Common Stock on the Series B Conversion Date for such converted shares
of Series B Preferred Stock.

         All capitalized terms used herein and not defined herein shall have the
meaning  ascribed  to  them  in  the  Company's   Certificate  of  Designations,
Preferences, and Rights of Series B Preferred Stock.

                                                [HOLDER]



                                                By:  ___________________________
                                                     Name:
                                                     Title:





                                                                    EXHIBIT 4.18

                          SECURITIES PURCHASE AGREEMENT

         This Securities Purchase Agreement (the "AGREEMENT"),  dated as of June
17, 1997, is entered into by and between JULIUS BAER  SECURITIES  INC. acting in
its  capacity as agent for  certain  non-U.S.  persons  (such  non-U.S.  persons
collectively,  the "PURCHASER") and DYNAGEN,  INC., a Delaware  corporation (the
"COMPANY").

         The parties hereto agree as follows:

         1. PURCHASE AND SALE OF PREFERRED  SHARES AND COMMON  SHARES.  Upon the
basis of the  representations  and  warranties,  and  subject  to the  terms and
conditions set forth in this Agreement, the Company covenants and agrees to sell
to the Purchaser on the Closing Date (as hereinafter  defined) 7,500 shares (the
"PREFERRED  Shares") of its Series B Preferred  Stock (the  "PREFERRED  STOCK"),
each  such  Preferred  Share  convertible  in  accordance  with  the  terms  and
conditions of the Company's  Certificate of Designation  for the Preferred Stock
in the form of EXHIBIT A annexed hereto (the  "CERTIFICATE OF  DESIGNATION")  on
the  dates  set  forth in the  Certificate  of  Designation  (any  such  date of
conversion,  the  "CONVERSION  DATE") into shares of the Company's  Common Stock
(the "CONVERSION  SHARES") and (ii) 225,000 shares of the Company's Common Stock
(the "COMMON SHARES"). The Preferred Shares and the Common Shares (the "SHARES")
shall be purchased at the aggregate  purchase  price of $750,000 (the  "PURCHASE
PRICE"),  representing  $2,250  for  the  Common  Shares  and  $747,750  for the
Preferred Shares.

         2. CLOSING. The closing of the purchase and sale of the Shares pursuant
to Section 1 hereof  shall take place on June 17,  1997 at the offices of Morse,
Zelnick, Rose & Lander LLP, located at 450 Park Avenue, Suite 902, New York, New
York  10022 or at such  other  date,  time and  place as the  Purchaser  and the
Company  may agree upon in  writing,  or,  subject to the last  sentence of this
Section 2, at such other time at which the Escrow Agent (as hereinafter defined)
shall have  received  all  documents  and  instructions  as it shall in its sole
judgment  deem  necessary  and   appropriate  to  consummate  the   transactions
contemplated  hereby (such time and date for the closing,  the "CLOSING  DATE").
The certificates representing the Shares shall be delivered by, or on behalf of,
the Company at the closing  against  payment of the Purchase  Price  therefor in
immediately  available  funds by, or on behalf of, the Purchaser to the attorney
trust account of Morse, Zelnick, Rose & Lander, LLP, (the "ESCROW AGENT") (Chase
Manhattan Bank, Account No. 967086639, ABA Routing Number 021000021). The Escrow
Agent shall receive from the Purchaser and the Company  written  instructions of
the  Purchaser  and the  Company in  substantially  the form of EXHIBIT B hereto
instructing  the  Escrow  Agent  with  respect  to the  closing  and  settlement
procedures,  subject,  however, to the terms and conditions of this Agreement on
the date  the  Purchaser  delivers  the  Purchase  Price  to the  Escrow  Agent.
Commencing on the fifth  business day after  delivery to the Escrow Agent of the
Purchase Price, the Purchaser, if the purchase and sale transaction contemplated
hereby has not been  consummated in accordance with the terms of this Agreement,
may terminate the proposed  transaction  by notice to the Company and the Escrow
Agent,  whereupon  the Escrow Agent shall






redeliver  the  Purchase  Price  to the  Purchaser  as  soon as  practicable  in
accordance with the written instructions of the Purchaser.

         3.  REPRESENTATIONS,  WARRANTIES  AND COVENANTS OF THE  PURCHASER.  The
Purchaser represents and warrants to, and agrees with, the Company that:

                  (a) The Purchaser  acknowledges that the Preferred Shares, the
Conversion Shares and the Common Shares have not been and will not be registered
under the Securities Act of 1933, as amended (the "SECURITIES ACT") or any other
applicable  securities  law (except  that the Company has agreed to register the
Conversion  Shares and the Common Shares under the Securities Act, in accordance
with the  Registration  Rights  Agreement  (as  defined  in  Section  6(b)) and,
accordingly,  may not be offered, sold,  transferred,  pledged,  hypothecated or
otherwise disposed of ("TRANSFERRED") unless registered under the Securities Act
or Transferred in a transaction  exempt from  registration  under the Securities
Act and any other applicable securities law.

                  The Purchaser  acknowledges  and agrees that the  certificates
representing the Preferred  Shares,  the Conversion Shares and the Common Shares
will bear a legend in substantially the following form:

                  THE SECURITIES  REPRESENTED BY THIS  CERTIFICATE HAVE NOT BEEN
                  REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS AMENDED (THE
                  "ACT") OR ANY STATE  SECURITIES  LAWS AND MAY NOT BE  OFFERED,
                  SOLD  OR  OTHERWISE   TRANSFERRED   IN  THE  ABSENCE  OF  SUCH
                  REGISTRATION OR AN AVAILABLE EXEMPTION THEREFROM UNDER THE ACT
                  AND ANY APPLICABLE STATE SECURITIES LAWS.

                  (b) The  Purchaser  is an  "accredited  investor"  within  the
meaning of Rule 501(a) under the  Securities  Act and was not  organized for the
specific  purpose of acquiring the Shares.  The Purchaser has such knowledge and
experience  in financial  and business  matters that it is capable of evaluating
the merits and risks of an investment in the Shares. The Purchaser is aware that
it may be required to bear the economic risk (including the possible loss of the
entire  investment) of an investment in the Shares for an indefinite period, and
it is able to bear such risk for an indefinite period.

                  (c) The  Purchaser is acquiring or will acquire the Shares for
its own account for investment  purposes and not with a view to, or for offer or
sale in connection  with, any  distribution  thereof,  except in compliance with
applicable securities laws (including  exemptions  thereunder) or pursuant to an
effective registration statement under the Securities Act.

                  (d) The  Purchaser  and/or  its  advisors,  if any,  have been
afforded  the  opportunity  to ask  questions  of the Company and have  received
satisfactory  answers to any such inquiries.  Without limiting the generality of
the foregoing, the Purchaser has had the opportunity to obtain and to review the
Company's  (1)  Transition  Report on Form 10-K for the  six-month



                                      -2-


period  ended  December  31,  1996 as filed  with the  Securities  and  Exchange
Commission (the "SEC"), (2) Quarterly Report on Form 10-Q for the fiscal quarter
ended March 31, 1997,  and (3) definitive  Proxy  Statement of the Company dated
December  27, 1996 for its Annual  Meeting of  Stockholders  held on January 30,
1997  (collectively,  the "SEC DOCUMENTS"),  each of which the Company has filed
pursuant to the  Securities  Exchange  Act of 1934,  as amended  (the  "EXCHANGE
ACT").

                  (e) The  Purchaser,  in electing to  subscribe  for the Shares
hereunder,  has  relied  upon an  independent  investigation  made by it and its
representative,  if any.  The  Purchaser  has  been  given  no  oral or  written
representations  or  assurances  from the Company or any  representative  of the
Company other than as set forth in this Agreement or in a document executed by a
duly  authorized   representative  of  the  Company  making  reference  to  this
Agreement.

                  (f) The Purchaser has no existing  short position with respect
to the  Common  Stock and  agrees  not to enter  into any  short  sales or other
hedging  or  derivative  security  transactions   involving  the  Common  Stock;
provided,  however,  that the  Purchaser  may enter into a short sale or hedging
transaction  at any time  after a  Conversion  Date (as such term is  defined in
Section 15) and through the Delivery Date (as defined in Section 15),  solely in
order to cover that number of Conversion  Shares being delivered on the Delivery
Date.  The  Purchaser  further  agrees that, at all times after the execution of
this Agreement by the Purchaser and prior to conversion of all Preferred Shares,
it will keep its purchase of the Shares confidential,  except as required by law
and except as necessary or appropriate in the ordinary course of the Purchaser's
business.

                  (g) The Purchaser acknowledges that, except for the historical
material contained herein or in the SEC Documents,  the matters disclosed herein
and therein are  forward-looking  statements  under the federal  securities laws
that  involve  risks and  uncertainties,  including,  but not  limited  to,  the
Company's ability to obtain future financing,  the management and integration of
acquired businesses and possible future acquisitions,  product demand and market
acceptance risks, the effect of economic  conditions,  the impact of competitive
products and pricing,  product development,  commercialization and technological
difficulties,  capacity and supply  constraints or difficulties,  the results of
financing efforts,  actual purchases under agreements,  and other risks detailed
in the Company's SEC  Documents.  Actual  results could differ  materially  from
those estimated or anticipated in these forward-looking statements.

                  (h) The  Purchaser  is a resident  of the state or country set
forth under its name on the signature page hereto.

                  (i) The foregoing  representations and warranties are true and
accurate as of the date hereof and unless  otherwise  informed in writing may be
relied upon by the Company as being true and correct as of the Closing Date.

         4.   REPRESENTATIONS  AND  WARRANTIES  OF  THE  COMPANY.   The  Company
represents and warrants to, and agrees with, the Purchaser that:



                                      -3-


                  (a)  The  Company  and  each of Able  Laboratories,  Inc.  and
DynaGen Acquisition Corp. (the  "Subsidiaries")  have been duly incorporated and
are validly existing as corporations  under the laws of their respective  states
of incorporation and have the requisite corporate powers to own their properties
and to carry on their businesses as now being conducted.

                  (b) This Agreement and the Registration  Rights Agreement have
been duly authorized, executed and delivered by the Company and constitute valid
and binding  agreements,  enforceable in accordance with their respective terms,
and the Company has full corporate  power and authority  necessary to enter into
such agreements and to perform its obligations thereunder.

                  (c) No consent, approval, authorization or order of any court,
governmental  agency or body or arbitrator having  jurisdiction over the Company
or any of its  affiliates  or of any third party or of the  stockholders  of the
Company is required for execution of this Agreement or the  Registration  Rights
Agreement  or  the  performance  of  its  obligations   under  such  agreements,
including,  without  limitation,  the issuance and sale of the Preferred Shares,
the Conversion  Shares and the Common Shares (except for the registration of the
Conversion  Shares and Common  Shares under the  Securities  Act pursuant to the
Registration  Rights  Agreement,  the listing of the  Conversion  Shares and the
Common Shares on the Nasdaq  SmallCap Market and any notices of sale required to
be filed with the SEC pursuant to Regulation D promulgated  under the Securities
Act or any state  securities law authority  pursuant to applicable blue sky laws
may be filed within the applicable periods therefor).

                  (d) Neither the sale of the Shares pursuant to this Agreement,
nor the performance of its obligations  under this Agreement or the Registration
Rights Agreement by the Company, will:

                           (i) violate, conflict with, result in a breach of, or
constitute  a default  (or an event which with the giving of notice or the lapse
of time or both would be reasonably  likely to  constitute a default)  under (A)
the  Certificate of  Incorporation  or By-laws of the Company or any Subsidiary,
(B) any decree, judgment,  order, law, treaty, rule, regulation or determination
applicable to the Company or any Subsidiary of any court, governmental agency or
body, or arbitrator  having  jurisdiction  over the Company or any Subsidiary or
over the properties or assets of the Company or any Subsidiary, (C) the terms of
any bond,  debenture,  or any other evidence of indebtedness,  or any agreement,
stock option or other similar plan, indenture, lease, mortgage, deed of trust or
other instrument to which the Company or any Subsidiary is a party, by which the
Company or any  Subsidiary  is bound,  or to which any of the  properties of the
Company  or any  Subsidiary  is  subject,  or (D) the terms of any  "lockup"  or
similar  provision of any underwriting or similar agreement to which the Company
is a party; or

                           (ii)  result in the  creation  or  imposition  of any
lien,  claim or other  encumbrance  upon any of the assets of the Company or any
Subsidiary.

                  (e) The Shares have been duly and validly  authorized  and are
(i)  free  and  clear  of  any  security  interests,   liens,  claims  or  other
encumbrances,   (ii)  are  duly  and  validly  issued,   (iii)



                                      -4-


fully  paid and  nonassessable,  (iv) not  issued  or sold in  violation  of any
preemptive  or other  similar  rights of the  holders of any  securities  of the
Company,  and (v) do not subject the holders  thereof to personal  liability  by
reason of being such holders.

                  (f)  The   Conversion   Shares  have  been  duly  and  validly
authorized  and when issued in accordance  with the terms of this  Agreement and
the  Certificate  of  Designation  (i)  will be free and  clear of any  security
interests,  liens, claims or other  encumbrances,  (ii) will be duly and validly
issued,  (iii)  will be fully  paid and  nonassessable,  (iv) will not have been
issued or sold in violation of any  preemptive  or other  similar  rights of the
holders of any  securities of the Company,  and (v) will not subject the holders
thereof to personal liability solely by reason of being such holders.

                  (g) Except as required  to be set forth in the SEC  Documents,
there is no pending or, to the best knowledge of the Company, threatened action,
suit, proceeding or investigation before any court, governmental agency or body,
or arbitrator having jurisdiction over the Company or any of its affiliates that
would  materially  adversely  affect the results of operations of the Company or
adversely affect the execution by the Company of, or materially adversely affect
the performance by the Company of its obligations  under,  this Agreement or the
Registration  Rights  Agreement,  or the  transactions  contemplated  hereby  or
thereby.

                  (h) Neither the Company, nor any authorized  representative of
the Company,  has made any written or oral  communication in connection with the
offer  or sale of the  securities  offered  hereby  that  contained  any  untrue
statement of a material fact or omitted to state any material fact  necessary in
order to make the statements, in the light of the circumstances under which they
were made, not misleading.

                  (i) None of the Company,  any affiliate of the Company, or any
person  acting on behalf of the Company or any such  affiliate  has engaged,  or
will engage, in any general  solicitation or general advertising with respect to
the Preferred Stock or the Common Shares.

                  (j) The Company is duly  organized,  validly  existing  and in
good standing under the laws of the state of Delaware and is duly qualified as a
foreign  corporation  in all  jurisdictions  in which the  failure to so qualify
would have a material adverse effect on the Company and its  Subsidiaries  taken
as a whole. The Company has registered its Common Stock pursuant to the Exchange
Act, and the Common Stock is listed and currently  trades on the Nasdaq SmallCap
Market.  The Company is not in violation  of the  applicable  listing  agreement
between the Company and any securities exchange or market on which the Company's
securities are listed.  The Company has filed all materials required to be filed
pursuant to all reporting obligations under either Section 13(a) or 15(d) of the
Exchange  Act for at least  twelve (12) months  immediately  preceding  the date
hereof, and has received no notice,  either oral or written, with respect to the
continued  eligibility for such listing. The Company has timely made all filings
required  under the Exchange Act during the twelve  month period  preceding  the
date hereof and is eligible to use Form S-3 to register  the  Conversion  Shares
and Common Shares. As of their respective dates, the financial statements of the
Company  included  in the SEC  Documents  complied  as to  form in all  material
respects with  applicable  accounting  requirements  and the



                                      -5-


published rules and regulations of the SEC with respect thereto.  Such financial
statements have been prepared in accordance with generally  accepted  accounting
principles,  consistently applied during the periods involved (except (i) as may
be otherwise  indicated in such financial  statements or the notes  thereto,  or
(ii) in the case of unaudited interim statements, to the extent they may exclude
footnotes or may be condensed or summary  statements)  and fairly present in all
material respects the financial  position of the Company as of the dates thereof
and the  results of its  operations  and cash flows for the  periods  then ended
(subject,  in the  case  of  unaudited  statements,  to  normal  year-end  audit
adjustments). Prior to the date hereof, the Company has corrected all statements
in the SEC Documents  that have required  correction and has filed all necessary
amendments to the SEC Documents, in each case as required by applicable law.

                  (k) As of the date hereof, the authorized capital stock of the
Company  consists of (i) 75,000,000  shares of Common Stock,  $.01 par value per
share,  of  which  30,122,477  shares  were  issued  and  outstanding,  and (ii)
10,000,000  shares of preferred  stock,  $.01 par value per share,  of which (A)
50,000 shares have been designated  Series A Preferred Stock, of which no shares
were issued and outstanding  and (B) 7,500 shares have been designated  Series B
Preferred  Stock,  of which no shares were issued and  outstanding.  All of such
outstanding   shares   have  been   validly   issued  and  are  fully  paid  and
nonassessable.  Except as contained in Section 5(i) of the  Securities  Purchase
Agreement  dated June 16, 1997 by and among the Company and the Investors  named
therein  evidencing  the sale of Series A Preferred  Stock,  no shares of Common
Stock are subject to preemptive  rights or any other similar rights or any liens
or encumbrances suffered or permitted by the Company. Except as disclosed in the
SEC Documents, (i) there are no outstanding options,  warrants, scrip, rights to
subscribe to, calls or commitments of any character  whatsoever  relating to, or
securities or rights convertible into or exchangeable for, any shares of capital
stock of the Company or any of its  subsidiaries,  or  arrangements by which the
Company or any of its  subsidiaries  is or may become bound to issue  additional
shares of  capital  stock of the  Company or any of its  subsidiaries,  and (ii)
there are no outstanding  debt  securities of the Company.  The Company has made
available to the Purchaser true and correct copies of the Company's  Certificate
of Incorporation, as amended, as in effect on the date hereof, and the Company's
By-laws.  As of the  Closing  Date and  before  giving  effect  to the  Superior
Acquisition  (as defined in Section  5(g)  hereof) and the Closing  contemplated
hereunder,  (i)  the  authorized  capital  stock  of  the  Company  will  be (x)
75,000,000 shares of Common Stock, $.01 par value per share, of which 30,272,477
shares will be issued and  outstanding  and (y)  10,000,000  shares of Preferred
Stock, $.01 par value per share, of which (A) 50,000 shares have been designated
Series A Preferred  Stock, of which 41,000 shares are issued and outstanding and
(B) 7,500 shares have been  designated as Series B Preferred  Stock, of which no
shares are issued and outstanding.

                  (l) The Company  undertakes  and agrees to make all  necessary
filings in connection with the sale of the securities offered hereby as required
by the  United  States  laws  and the  regulations  or any  domestic  securities
exchange or trading market.

                  (m) Except as set forth in the SEC  Documents,  since December
31,  1996,  there  has  been no  material  adverse  development  in the  assets,
liabilities, business properties,  operations, financial condition or results of
operations  of the  Company  and its  subsidiaries  taken as a whole,  except as
disclosed  in the  filings of the  Company  with the SEC,  other than  continued
losses.


                                      -6-



                  (n) None of the  filings  of the  Company  with the SEC  since
December 31, 1996 contained,  at the time they were filed,  any untrue statement
of a material  fact or omitted to state any material  fact required to be stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances under which they were made, not misleading.  The Company has since
July 1, 1996 timely filed all requisite forms, reports and exhibits thereto with
the  SEC.  As of their  respective  dates,  the SEC  Documents  complied  in all
material  respects with the  requirements  of the Exchange Act and the rules and
regulations of the SEC promulgated thereunder applicable to the SEC Documents.

                  (o)  Except  as set  forth in the SEC  Documents,  there is no
known  fact to the  Company  or any  subsidiary  (other  than  general  economic
conditions generally known to the public) that has not been disclosed in writing
to the  Purchaser  that (i) could  reasonably  be  expected  to have a  material
adverse  effect on the  condition  (financial  or otherwise) or in the earnings,
business affairs, properties or assets of the Company or any subsidiary, or (ii)
could  reasonably be expected to adversely  affect the ability of the Company or
any  subsidiary  to perform its  obligations  pursuant to this  Agreement or the
Registration Rights Agreement.

                  (p) The  Company  acknowledges  and agrees that  Purchaser  is
acting solely in the capacity of an arm's length  purchaser with respect to this
Agreement  and  the   Registration   Rights   Agreement  and  the   transactions
contemplated hereby and thereby. The Company further acknowledges that Purchaser
is not acting as a  financial  advisor or  fiduciary  of the  Company (or in any
similar  capacity)  with respect to this Agreement and the  Registration  Rights
Agreement and the  transactions  contemplated  hereby and thereby and any advice
given by the  Purchaser or any of its  representatives  or agents in  connection
with this  Agreement  and the  transactions  contemplated  hereby and thereby is
merely incidental to the Purchaser's purchase of the Shares. The Company further
represents  to the  Purchaser  that the  Company's  decision  to enter into this
Agreement  and the  Registration  Rights  Agreement has been based solely on the
independent evaluation by the Company and its representatives.

                  (q)  Neither  the  Company,  nor any of its  affiliates,  has,
directly or indirectly,  made any offers or sales of any securities or solicited
any  offers  to  buy  any  security,  under  circumstances  that  would  require
registration of the Preferred Stock under the Securities Act.

                  (r) Except as set forth  within this  Agreement  or in the SEC
Documents, the Company and its Subsidiaries own, have obtained or possess rights
to use the trademarks,  trade names,  service marks, service mark registrations,
patents, copyrights,  licenses,  approvals,  governmental authorizations,  trade
secrets and other rights necessary to conduct their respective businesses as now
conducted,  the Company does not have any knowledge of any material infringement
by the Company or its subsidiaries of any trademark,  trade name rights,  patent
rights, copyrights,  licenses, service marks, service mark registrations,  trade
secrets  or other  similar  rights of others,  and there is no claim  being made
against the Company or its subsidiaries regarding trademark, trade name, patent,
copyright,  license, service marks, service mark registrations,  trade secret or
other  infringement  which could have a material  adverse effect on the Company.
The Company and its  subsidiaries  have taken  reasonable  security  measures to
protect  the  secrecy,



                                      -7-


confidentiality and value of all of their intellectual properties.

                  (s) The Company  understands and  acknowledges the potentially
dilutive effect to the Common Stock of the issuance of the Conversion Shares and
the Common Shares.

         5. COVENANTS OF THE COMPANY.  The Company covenants and agrees with the
Purchaser:

                  (a) To  comply  with all  requirements  of  Section  4(2) with
respect to the Common Shares and the Preferred Shares,  and Section 3(a)(9) with
respect to the  Conversion  Shares,  and to the extent  applicable  Regulation D
under the Securities Act, with respect to the sale of the Preferred Shares,  the
Conversion Shares and the Common Shares.

                  (b) To notify the Purchaser promptly if at any time during the
period  beginning on the date of this  Agreement  and ending on the Closing Date
any  event  shall  have  occurred  as a result  of  which  any  written  or oral
communication  made by the Company,  or any authorized  person  representing the
Company,  would include an untrue  statement of a material fact or omit to state
any material  fact  necessary in order to make the  statements  therein,  in the
light of the circumstances under which they were made, not misleading.

                  (c) To cause the Conversion Shares to be, upon delivery, fully
paid,  nonassessable,  free of preemptive rights and free from all taxes, liens,
charges, security interests or other encumbrances.

                  (d) To have at all times authorized and reserved for issuance,
free from preemptive  rights,  a sufficient  number of shares of Common Stock to
satisfy  the  conversion  rights  of the  Purchaser  pursuant  to the  terms and
conditions of the Preferred  Stock and the  Certificate  of  Designation  and to
satisfy the  issuance of any other  shares of Common Stock that are reserved for
issuance  or that  are  issuable  upon the  exercise,  conversion,  exchange  or
satisfaction  of any  outstanding  securities  or  obligations  or rights of the
Company.

                  (e) Each party shall use its best efforts to take, or cause to
be taken,  all  action  and to do, or cause to be done,  all  things  necessary,
including without  limitation,  timely to satisfy the conditions to be satisfied
as provided in Section 6 and 7 of this Agreement, to consummate the transactions
contemplated hereby.

                  (f) Until the  earlier  of (i) the date that is one year after
the date as of which the Holders  (as that term is defined in Section  8(b)) may
sell all of the Conversion  Shares without  restriction  pursuant to Rule 144(k)
promulgated under the Securities Act (or successor  thereto) or (ii) the date on
which (a) the  Holders  shall  have sold all the  Conversion  Shares  and Common
Shares and (b) none of the Preferred Stock is outstanding, the Company shall use
its best efforts to file all reports  required to be filed with the SEC pursuant
to the Exchange Act, and the Company shall not voluntarily  terminate its status
as a  Company  required  to file  reports  under  the  Exchange  Act even if the
Exchange  Act  or  the  rules  and  regulations  thereunder  would  permit  such
termination.



                                      -8-


                  (g) The  Company  will use the  proceeds  from the sale of the
Shares for  working  capital and other  general  corporate  purposes,  including
consummation  of  the  acquisition  of  Superior   Pharmaceutical  Company  (the
"SUPERIOR  ACQUISITION")  pursuant to that certain  Agreement and Plan of Merger
dated as of March 7, 1997, as amended.

                  (h) The Company shall use its best efforts to promptly  secure
the  listing  of the  Conversion  Shares and Common  Shares  upon each  national
securities  exchange or automated quotation system, if any, upon which shares of
Common Stock are then listed or quoted  (subject to official notice of issuance)
and shall use its best  efforts to maintain  the listing of all such shares from
time to time issuable  under the terms of this  Agreement,  the  Certificate  of
Designation and the Registration  Rights  Agreement.  During the period that the
Company is required to maintain effective a registration  statement covering the
Conversion  Shares and Common Shares,  the Company shall use its best efforts to
maintain the Common  Stock's  authorization  for listing on the Nasdaq  SmallCap
Market and any such other national securities exchange.

         6. CONDITIONS PRECEDENT TO THE PURCHASER'S OBLIGATIONS. The obligations
of the Purchaser  hereunder are subject to the performance by the Company of its
obligations  hereunder  and to the  satisfaction  of  the  following  additional
conditions precedent:

                  (a) The  representations and warranties made by the Company in
this Agreement shall, unless waived by the Purchaser, be true and correct in all
material  respects as of the date hereof and at the Closing Date,  with the same
force and  effect as if they had been made on and as of the  Closing  Date.  The
Company shall have  performed,  satisfied and complied in all material  respects
with the covenants,  agreements and conditions  required by this Agreement to be
performed,  satisfied or complied with by the Company at or prior to the Closing
Date.

                  (b) The Company and the Purchaser  shall have entered into the
Registration   Rights  Agreement  (the   "REGISTRATION   RIGHTS  AGREEMENT")  in
substantially the form annexed hereto as EXHIBIT C.

                  (c) The Company  will  provide to the  Purchaser an opinion or
opinions of counsel in substantially the form annexed hereto as EXHIBIT D.

                  (d)  The  Company   shall  have  filed  the   Certificate   of
Designation with the Secretary of the State of Delaware.

                  (e) None of the following shall have occurred: (i) any general
suspension  of trading in, or  limitation on prices listed for, the Common Stock
on the Nasdaq,  (ii) a declaration of a banking  moratorium or any suspension of
payments in respect to banks in the United  States,  (iii) a  commencement  of a
war, armed  hostilities or other  international or national calamity directly or
indirectly  involving  the  United  States,  (iv) in the  case of the  foregoing
existing at the date of this  Agreement,  a material  acceleration  or worsening
thereof,  or (v) any  limitation  by the  federal  or state  authorities  on the
extension  of credit by  lending  institutions  that  materially  and  adversely
affects the Purchaser.



                                      -9-



                  (f) The  Company  shall have  executed  and  delivered  to the
Escrow Agent the certificates representing the Shares.

                  (g) No action, suit,  investigation or proceeding before or by
any governmental  authority shall have been commenced or threatened  against the
Company or any of the officers,  directors or  affiliates  of the Company,  that
seeks to restrain,  prevent or challenge the  transactions  contemplated by this
Agreement  or the  Registration  Rights  Agreement  or  that  seeks  damages  in
connection with such transactions.

         7.       CONDITIONS PRECEDENT TO THE COMPANY'S OBLIGATIONS.

                  (a) The  obligations  of the Company  hereunder are subject to
the  performance  by the  Purchaser of their  obligations  hereunder  and to the
satisfaction of the condition  precedent that the representations and warranties
made by the Purchaser in this Agreement shall,  unless waived by the Company, be
true and  correct  in all  material  respects  as of the date  hereof and at the
Closing Date,  with the same force and effect as if they had been made on and as
of the Closing Date.

                  (b) The Purchaser  shall have delivered to the Escrow Agent by
wire transfer the Purchase Price for the Shares.

         8.       TRANSFER OF SECURITIES.

                  (a) Securities  Act Legend.  Each  certificate  evidencing the
Preferred  Shares,  the  Conversion  Shares  and  the  Common  Shares,  and  any
certificates issued upon transfer or exchange of the foregoing, shall be stamped
or imprinted  with the legend  substantially  as set forth in Section 3(a).  The
legend set forth in Section 3(a) shall be removed and the Company  shall issue a
certificate  without  such  legend to the holder of the  Preferred  Shares,  the
Conversion  Shares and the Common Shares as applicable upon which it is stamped,
if, unless otherwise  required by state securities laws, (a) with respect to the
Conversion  Shares and the Common Shares,  the sale of the Conversion Shares and
the Common Shares,  as the case may be, is registered  under the Securities Act,
or (b) in connection  with a Transfer,  such holder provides the Company with an
opinion of counsel,  in form,  substance and scope reasonably  acceptable to the
Company, to the effect that a Transfer thereof may be made without  registration
under  the  Securities  Act,  or (c)  such  holder  provides  the  Company  with
reasonable  assurances that the Preferred Shares,  the Conversion Shares and the
Common  Shares,  as  applicable,  can be sold  pursuant  to Rule 144  under  the
Securities Act (or a successor rule thereto). Notwithstanding the removal of any
such  legend,  the  Purchaser  agrees to  Transfer  the  Preferred  Shares,  the
Conversion  Shares  and  the  Common  Shares,  including  those  represented  by
certificate(s)  from which the legend has been removed,  in compliance  with all
applicable securities laws.

                  (b) Securities Act  Compliance.  Each holder (a "HOLDER") of a
certificate  evidencing  the Preferred  Shares,  the  Conversion  Shares and the
Common Shares that bears the restrictive  legend set forth in Section 3(a) above
(the  "RESTRICTED  SECURITIES"),  and who  proposes



                                      -10-


to Transfer  any  Restricted  Securities  (other than  pursuant to an  effective
registration  statement  under the  Securities Act or pursuant to Rule 144 under
the Securities  Act),  shall give written notice to the Company of such Holder's
intention to effect such  Transfer.  Each such notice shall  describe the manner
and circumstances of the proposed sale or other disposition in sufficient detail
and shall be accompanied by an opinion of legal counsel to the Holder.  Promptly
upon receipt of such notice,  the Company shall present a copy thereof (together
with any  accompanying  opinion  of legal  counsel  to the  Holder) to its legal
counsel, and the following provisions shall apply:

                           (i) If,  in the  opinion  of  legal  counsel  to such
Holder,  reasonably  satisfactory  in form and  substance to the Company and its
legal  counsel,  or if such  notice was not  accompanied  by an opinion of legal
counsel to the Holder, then, if, in the opinion of legal counsel to the Company,
the proposed sale or other  disposition may be effected without  registering the
Restricted   Securities  involved  under  the  Securities  Act  or  under  state
securities  laws,  such Holder shall be entitled to so Transfer such  Restricted
Securities in accordance with the terms of such notice  delivered to the Company
pursuant to this paragraph (b). The Company will advise the Holder,  within five
(5) business days after submission of such notice,  whether the Company believes
such Holder is entitled to so Transfer the  Restricted  Securities in accordance
with the  foregoing.  If the Holder is entitled to so Transfer,  he shall submit
the stock certificate or certificates evidencing the Restricted Securities to be
Transferred  to the  Company in proper  form for  Transfer  and  accompanied  by
appropriate  instruments  of Transfer and the Company shall  promptly  issue new
certificates  giving  effect  to  such  Transfer.  Certificates  for  Restricted
Securities  thus  Transferred  (and  each  of the  certificates  evidencing  any
untransferred  balance of the Preferred  Shares,  the  Conversion  Shares or the
Common Shares not so transferred) shall bear the restrictive legend set forth in
Section  3(a),  unless,  in the opinion of such Holder's  legal  counsel  (which
opinion shall be reasonably  satisfactory in form and substance to legal counsel
for the  Company),  or in the  opinion of legal  counsel to the  Company (if the
Holder did not  present an opinion  of its legal  counsel),  such  legend is not
required by the applicable  provisions of the Securities Act or state securities
laws; and

                           (ii) If in the  reasonable  opinion of Holder's legal
counsel  (or legal  counsel to the  Company  if the  Holder  did not  present an
opinion of its legal counsel),  the proposed Transfer cannot be effected without
registering the Restricted Securities involved under the Securities Act or state
securities  laws,  such Holder  shall not offer to  Transfer  or  Transfer  such
Restricted  Securities  unless and until such  Restricted  Securities  have been
registered under the Securities Act or state securities laws for such purpose or
an exemption from such registration becomes available.  Upon the consummation of
the transactions  contemplated by this Agreement,  the Company shall have agreed
to register the Conversion Shares and the Common Shares pursuant to the terms of
the Registration Rights Agreement.

                  (c) Subject to the restrictions set forth in Sections 8(a) and
(b) above,  upon the valid  conversion of the Preferred Stock, the Company shall
instruct its transfer agent to issue certificates, registered in the name of the
Purchaser or its nominee, for the Conversion Shares in such amounts as specified
from time to time by the  Purchaser to the Company.  The Company  shall  provide
instructions  and opinions of counsel to its transfer  agent in  accordance  the
Registration  Rights Agreement and this Section 8. Nothing in this Section shall
affect in any way



                                      -11-


Purchaser's  obligations and agreement to comply with all applicable  securities
laws upon resale of the Conversion Shares.

         9. FEES AND EXPENSES.  Each of the Purchaser and the Company  agrees to
pay its  respective  expenses  incident to the  performance  of its  obligations
hereunder,  including,  but not limited to, the fees,  expenses,  due  diligence
costs and disbursements of such party's counsel.

         10. SURVIVAL OF THE  REPRESENTATIONS,  WARRANTIES,  ETC. The respective
agreements,  representations,  warranties, indemnities and other statements made
by or on behalf of the Company and the Purchaser, respectively, pursuant to this
Agreement,  shall  remain in full force and effect for a period of three  years,
regardless of any investigation  made by or on behalf of the other party to this
Agreement or any  officer,  director or employee  of, or person  controlling  or
under common control with,  such party and will survive  delivery of any payment
for the Preferred Stock, the Conversion Shares and the Common Shares.

         11. NOTICES. All notices,  requests and other communications  hereunder
must be in writing and  delivered to the parties at the  following  addresses or
facsimile numbers:

If to the Purchaser, to:

         Julius Baer Securities Inc.
         330 Madison Avenue
         New York, NY  10017

         Telecopy:  (212) 697-5322

With a copy to:

         Rogers & Wells
         Two Hundred Park Avenue
         New York, NY  10166
         Attention:  Sara Hanks, Esq.

         Telecopy:  (212) 878-8375

If to the Company, to:

         DynaGen, Inc.
         99 Erie Street
         Cambridge, MA  02139
         Attention:  President

         Telephone:        (617) 491-2527
         Telecopy:         (617) 354-3902





                                      -12-


All such  notices,  requests  and  other  communications  will (i) if  delivered
personally  (including,  without  limitation,  by  reputable  overnight  courier
service)  to the  address as  provided  in this  Section,  be deemed  given upon
delivery, (ii) if delivered by facsimile transmission to the facsimile number as
provided in this Section,  be deemed given upon telecopy generated  confirmation
of receipt,  and (iii) if delivered by mail in the manner described above to the
address as provided in this Section,  be deemed given upon receipt (in each case
regardless of whether such notice, request or other communication is received by
any other  person to whom a copy of such notice is to be  delivered  pursuant to
this  Section).  Any party from time to time may change its  address,  facsimile
number or other  information  for the purpose of notices to that party by giving
notice specifying such change to the other parties hereto.

         12. THIRD PARTY  BENEFICIARY.  Any permitted  transferee of any part of
the  principal  amount of the Preferred  Stock,  the  Conversion  Shares and the
Common Shares shall be a third party  beneficiary  of the Company's  obligations
under this Agreement and the Registration  Rights  Agreement.  Such person shall
have all the rights of a third party beneficiary with respect to the enforcement
against the Company of any  provision  of this  Agreement  and the  Registration
Rights Agreement.

         13.      MISCELLANEOUS.

                  (a) This Agreement may be executed in one or more counterparts
and it is not  necessary  that  signatures  of all  parties  appear  on the same
counterpart,  but such  counterparts  together shall  constitute but one and the
same agreement.  This Agreement,  once executed by a party,  may be delivered to
the other party by facsimile  transmission  of a copy of this Agreement  bearing
the signature of the party so delivering this Agreement.

                  (b)  This  Agreement  shall  inure  to the  benefit  of and be
binding upon the parties  hereto,  their  respective  successors  and  permitted
assigns.

                  (c) This  agreement  shall be governed  by, and  construed  in
accordance  with,  the laws of the State of Delaware  (without  giving effect to
conflicts of laws principles).

                  (d) The  headings of the sections of this  document  have been
inserted for  convenience of reference only and shall not be deemed to be a part
of this Agreement.

                  (e) The provisions of this Agreement are severable, and if any
clause or provision shall be held invalid,  illegal or unenforceable in whole or
in part in any  jurisdiction,  then such  invalidity or  unenforceability  shall
affect in that jurisdiction only such clause or provision,  or part thereof, and
shall  not  in  any  manner  affect  such  clause  or  provision  in  any  other
jurisdiction  or  any  other  clause  or  provision  of  this  Agreement  in any
jurisdiction.

                  (f) This  Agreement,  including  the  schedules  and  exhibits
hereto, constitutes the sole and entire agreement of the parties with respect to
the subject matter hereof.

                  (g) Each party shall do and  perform,  or cause to be done and
performed,  all



                                      -13-


such  further  acts and  things,  and shall  execute  and deliver all such other
agreements, certificates, instruments and documents, as the party may reasonably
request in order to carry out the intent and  accomplish  the  purposes  of this
Agreement and the consummation of the transactions contemplated hereby.

                  (h)  Notwithstanding any of the  representations,  warranties,
acknowledgments  or  agreements  made herein by the Company and  Purchaser,  the
Company and  Purchaser do not thereby or in any manner waive any rights  granted
to it or him under U.S. Federal or state securities laws.

                  (i) The  provisions  of this  Agreement,  other than  Sections
4(l), 5(f), 8, 10, 11, 12, 13, 14, 15 and 19, shall terminate when all Preferred
Shares  have been  converted  into  shares  of the  Company's  Common  Stock and
delivered to Purchaser.

                  (j) The parties  shall resolve any dispute  arising  hereunder
before a panel of three  arbitrators  selected pursuant to and run in accordance
with  the  rules  of  the  National   Association  of  Securities  Dealers.  The
arbitration  shall be held in New York,  New York.  The  winning  party shall be
entitled to an award of reasonable attorney's fees and costs.

         14.      INDEMNIFICATION.

                  (a) The Company  agrees to  indemnify  the  Purchaser  and its
officers,  directors,  employees,  agents and  affiliates in respect of and hold
each of them  harmless  from and  against,  any and all  damages,  fines,  fees,
penalties,  deficiencies,  losses and  expenses  (including  without  limitation
interest, court costs, fees of attorneys, accountants and other experts or other
expenses  of  litigation  or other  proceedings  or of any  claims,  default  or
assessment)  ("Losses")  suffered,  incurred or  sustained  by any of them or to
which any of them becomes subject, resulting from, arising out of or relating to
any  misrepresentation,  breach of warranty or  nonfulfillment  of or failure to
perform any covenant or  agreement on the part of the Company  contained in this
Agreement,  as such  expenses are incurred,  unless such Loss results  primarily
from the Purchaser's gross  negligence,  recklessness or bad faith in performing
the obligations which are the subject of this Agreement (a "Company Indemnifying
Event").

                  (b) The  Purchaser  agrees to  indemnify  the  Company and its
officers,  directors,  employees,  agents and affiliates in respect of, and hold
each of them harmless from and against, any and all Losses suffered, incurred or
sustained  by any of them or to which  any of them  becomes  subject,  resulting
from, arising out of or relating to any misrepresentation, breach of warranty or
nonfulfillment of or failure to perform any covenant or agreement on the part of
Purchaser  contained in this  Agreement,  as such expenses are incurred,  unless
such Loss results from the Company's gross negligence, recklessness or bad faith
in  performing  the  obligations  which are the  subject  of this  Agreement  (a
"Purchase Indemnifying Event").

                  (c) No party shall be entitled to  indemnification  for Losses
relating to a Company Indemnifying Event or a Purchaser Indemnifying Event until
the aggregate amount of



                                      -14-


such Losses  exceeds  $50,000  (the  "Threshold"),  and then such party shall be
entitled only to the amount of the Losses in excess of the Threshold.

         15.  METHOD  OF  ASSERTING   INDEMNIFICATION  CLAIMS.  All  claims  for
indemnification  by any  Indemnified  Party (as defined  below) under Section 14
will be asserted and resolved as follows:

                  (a) In the event any claim or demand in  respect  of which any
person  claiming   indemnification   under  any  provision  of  Section  14  (an
"Indemnified  Party") might seek indemnity under Section 14 is asserted  against
or sought to be collected from such Indemnified Party by a person other than the
Company,  the  Purchaser  or any  affiliate  of the Company or the  Purchaser (a
"Third  Party   Claim"),   the   Indemnified   Party  shall  deliver  a  written
notification,  enclosing a copy of all papers served, if any, and specifying the
nature of and basis for such Third Party Claim and for the  Indemnified  Party's
claim for indemnification  that is being asserted under any provision of Section
14 against any person (the "Indemnifying  Party"),  together with the amount or,
if not then reasonably  ascertainable,  the estimated amount, determined in good
faith, of such Third Party Claim (a "Claim  Notice") with reasonable  promptness
to the Indemnifying  Party. If the Indemnified  Party fails to provide the Claim
Notice with reasonable promptness after the Indemnified Party receives notice of
such  Third  Party  Claim,  the  Indemnifying  Party  will not be  obligated  to
indemnify  the  Indemnified  Party with respect to such Third Party Claim to the
extent  that the  Indemnifying  Party's  ability to defend has been  irreparably
prejudiced by such failure of the Indemnified Party. The Indemnifying Party will
notify the  Indemnified  Party as soon as  practicable  within the period ending
thirty (30) calendar days following receipt by an Indemnifying Party of either a
Claim Notice or an Indemnity  Notice (as defined  below) (the "Dispute  Period")
whether the Indemnifying  Party disputes its liability to the Indemnified  Party
under Section 14 and whether the  Indemnifying  Party desires,  at its sole cost
and expense, to defend the Indemnified Party against such Third Party Claim.

                           (1)   If  the   Indemnifying   Party   notifies   the
Indemnified Party within the Dispute Period that the Indemnifying  Party desires
to defend the  Indemnified  Party with respect to the Third Party Claim pursuant
to this  Section  15(a),  then the  Indemnifying  Party  will  have the right to
defend,  with counsel  reasonably  satisfactory to the Indemnified Party, at the
sole cost and expense of the Indemnifying  Party,  such Third Party Claim in all
appropriate  proceedings,  which  proceedings  will be vigorously and diligently
prosecuted by the Indemnifying Party to a final conclusion or will be settled at
the  discretion  of the  Indemnifying  Party  (but only with the  consent of the
Indemnified  Party in the case of any  settlement  that  provides for any relief
other than the payment of monetary  damages or that  provides for the payment of
monetary  damages as to which the  Indemnified  Party will not be indemnified in
full pursuant to Section 14). The  Indemnifying  Party will have full control of
such defense and  proceedings,  including any compromise or settlement  thereof;
provided,  however, that the Indemnified Party may, at the sole cost and expense
of the Indemnified Party, at any time prior to the Indemnified  Party's delivery
of the notice referred to in the first sentence of this Section  15(a)(1),  file
any  motion,  answer  or  other  pleading  or take  any  other  action  that the
Indemnified Party reasonably  believes to be necessary or appropriate to protect
its  interests;  and provided  further,  that if  requested by the  Indemnifying
Party,  the  Indemnified  Party  will,  at the  sole  cost  and  expense  of the
Indemnifying Party, provide



                                      -15-



reasonable  cooperation to the Indemnifying  Party in contesting any Third Party
Claim that the Indemnifying  Party elects to contest.  The Indemnified Party may
participate  in, but not control,  any defense or  settlement of any Third Party
Claim  controlled by the Indemnifying  Party pursuant to this Section  15(a)(1),
and except as provided in the preceding  sentence,  the  Indemnified  Party will
bear  its  own  costs  and  expenses   with   respect  to  such   participation.
Notwithstanding  the foregoing,  the Indemnified Party may take over the control
of  the  defense  or  settlement  of a  Third  Party  Claim  at any  time  if it
irrevocably  waives its right to indemnity under Section 14 with respect to such
Third Party Claim.

                           (2) If the  Indemnifying  Party  fails to notify  the
Indemnified Party within the Dispute Period that the Indemnifying  Party desires
to  defend  the  Third  Party  Claim  pursuant  to  Section  15(a),  or  if  the
Indemnifying  Party  gives such  notice but fails to  prosecute  vigorously  and
diligently or settle the Third Party Claim, or if the  Indemnifying  Party fails
to give any notice  whatsoever  within the Dispute Period,  then the Indemnified
Party  will  have the  right to  defend,  at the sole  cost and  expense  of the
Indemnifying Party, the Third Party Claim by all appropriate proceedings,  which
proceedings will be prosecuted by the Indemnified  Party in a reasonable  manner
and in good faith or will be settled at the discretion of the Indemnified  Party
(with  the  consent  of  the  Indemnifying  Party,  which  consent  will  not be
unreasonably  withheld).  The  Indemnified  Party will have full control of such
defense  and  proceedings,  including  any  compromise  or  settlement  thereof,
provided however,  that if requested by the Indemnified  Party, the Indemnifying
Party will,  at the sole cost and  expense of the  Indemnifying  Party,  provide
reasonable  cooperation to the  Indemnified  Party and its counsel in contesting
any Third Party Claim which the Indemnified Party is contesting. Notwithstanding
the foregoing provisions of this Section 15(a)(2), if the Indemnifying Party has
notified the Indemnified  Party within the Dispute Period that the  Indemnifying
Party disputes its liability  hereunder to the Indemnified Party with respect to
such  Third  Party  Claim  and if such  dispute  is  resolved  in  favor  of the
Indemnifying  Party in the  manner  provided  in  Section  15(a)(3)  below,  the
Indemnifying  Party will not be required  to bear the costs and  expenses of the
Indemnified  Party's  defense  pursuant  to  this  Section  15(a)(2)  or of  the
Indemnifying Party's  participation  therein at the Indemnified Party's request,
and the Indemnified Party will reimburse the Indemnifying  Party in full for all
reasonable costs and expenses  incurred by the Indemnifying  Party in connection
with such  litigation.  The  Indemnifying  Party  may  participate  in,  but not
control, any defense or settlement  controlled by the Indemnified Party pursuant
to this Section 15(a)(2), and the Indemnifying Party will bear its own costs and
expenses with respect to such participation.

                           (3)   If  the   Indemnifying   Party   notifies   the
Indemnified  Party that it does not dispute  its  liability  to the  Indemnified
Party with respect to the Third Party Claim under  Section 14 or fails to notify
the Indemnified  Party within the Dispute Period whether the Indemnifying  Party
disputes its liability to the Indemnified Party with respect to such Third Party
Claim, the Loss in the amount specified in the Claim Notice will be conclusively
deemed  a  liability  of  the  Indemnifying  Party  under  Section  14  and  the
Indemnifying Party shall pay the amount of such Loss to the Indemnified Party on
demand. If the Indemnifying Party has timely disputed its liability with respect
to such claim, the Indemnifying  Party and the Indemnified Party will proceed in
good faith to  negotiate  a  resolution  of such  dispute,  and if not  resolved
through  negotiations



                                      -16-


within the Resolution  Period,  such dispute shall be resolved by arbitration in
accordance with paragraph (c) of Section 15.

                  (b) In the event any  Indemnified  Party  should  have a claim
under  Section 14 against any  Indemnifying  Party that does not involve a Third
Party Claim,  the  Indemnified  Party shall deliver a written  notification of a
claim for indemnity under Section 14 specifying the nature of and basis for such
claim together with the amount,  or if not then  reasonably  ascertainable,  the
estimated  amount,  determined  in good  faith,  of such  claim  (an  "Indemnity
Notice") with reasonable  promptness to the  Indemnifying  Party. The failure by
any Indemnified Party to give the Indemnity Notice shall not impair such party's
rights  hereunder except to the extent that an Indemnifying  Party  demonstrates
that it has been  irreparably  prejudiced  thereby.  If the  Indemnifying  Party
notices the  Indemnified  Party that it does not dispute the claim  described in
such  Indemnity  Notice or fails to notify  the  Indemnified  Party  within  the
Dispute Period whether the  Indemnifying  Party disputes the claim  described in
such Indemnity Notice,  the Loss in the amount specified in the Indemnity Notice
will be conclusively  deemed a liability of the Indemnifying Party under Section
14 and  the  Indemnifying  Party  shall  pay  the  amount  of  such  Loss to the
Indemnified Party on demand.  If the Indemnifying  Party has timely disputed its
liability with respect to such claim, the Indemnifying Party and the Indemnified
Party will proceed in good faith to negotiate a resolution of such dispute,  and
if not resolved through  negotiations within the Resolution Period, such dispute
shall be  resolved by  arbitration  in  accordance  with  paragraph  (c) of this
Section 15.

                  (c) Any  dispute  submitted  to  arbitration  pursuant to this
Section 15 shall be finally and  conclusively  determined  by the  decision of a
board of  arbitration  consisting  of three (3) members  (hereinafter  sometimes
called the "Board of Arbitration") selected as hereinafter provided. Each of the
Indemnified Party and the Indemnifying Party shall select one (1) member and the
third member shall be selected by mutual  agreement of the other members,  or if
the other  members fail to reach  agreement on a third member within twenty (20)
days after their  selection,  such third member shall  thereafter be selected by
the  American  Arbitration  Association  upon  application  made to it for  such
purpose  by the  Indemnified  Party.  The  Board of  Arbitration  shall  meet on
consecutive  business  days in New  York,  New  York or such  other  place  as a
majority of the members of the Board of Arbitration determines more appropriate,
and shall  reach and render a decision  in writing at the end of such  period of
consecutive  business  days  (concurred  in by a majority  of the members of the
Board of Arbitration) with respect to the amount, if any, which the Indemnifying
Party is required to pay to the Indemnified Party in respect of a claim filed by
the Indemnified  Party. In connection with rendering its decision,  the Board of
Arbitration  shall adopt and follow such rules and  procedures  as a majority of
the members of the Board of Arbitration  deems necessary or appropriate.  To the
extent  practical,  decisions of the Board of  Arbitration  shall be rendered no
more than thirty (30) calendar days following  commencement of proceedings  with
respect thereto. The Board of Arbitration shall cause its written decision to be
delivered to the Indemnified Party and the Indemnifying Party. Any decision made
by the Board of  Arbitration  (either  prior to or after the  expiration of such
thirty (30) calendar day period) shall be final,  binding and  conclusive on the
Indemnified  Party  and the  Indemnifying  Party  and  shall be  entitled  to be
enforced  to the  fullest  extent  permitted  by law and entered in any court of
competent jurisdiction. Each party to any arbitration shall bear its own expense
in relation  thereto,  including



                                      -17-


but not limited to such  party's  attorneys  fees,  if any, and the expenses and
fees of the Board of Arbitration shall be divided between the Indemnifying Party
and the  Indemnified  Party in the same proportion as the portion of the related
claim  determined by the Board of Arbitration  to be payable to the  Indemnified
Party bears to the portion of such claim determined not to be so payable.

         16. TIME OF ESSENCE. Time shall be of the essence in this Agreement.

         17. COMPLIANCE WITH TAX LAW.

                  The Company  and the  Purchaser  agree that the  Company  will
comply with its applicable federal or other tax withholding obligations.

         18. LIQUIDATED DAMAGES FOR FAILURE TO DELIVER.  The Company understands
that a delay beyond the deadline for delivery,  specified in Section 5(j) of the
Certificate of Designation,  could result in economic loss to the Purchaser.  As
compensation  to the  Purchaser  for such loss,  the Company  agrees to pay late
payments to the Purchaser for the late issuance of Conversion Shares issuable at
conversion of the  Preferred  Stock in  accordance  with the following  schedule
(where "No. Business Days Late" is defined as the number of business days beyond
three business days after receipt by the Company of the Original Documentation):

                                              Late Payment for Each $10,000 of
   No. Business Days Late                   Original Investment Being Converted

              3                                         $     50.00
              4                                         $    100.00
              5                                         $    150.00
              6                                         $    200.00
              7                                         $    250.00
              8                                         $    300.00
              9                                         $    350.00
             10                                         $    400.00
            >10                             $400.00 + $100.00 for each Business
                                                  Day Late Beyond 10 Days

         The Company  shall make any  payments  incurred  under this  Section in
immediately  available  funds  upon  demand.  Nothing  herein  shall  limit  the
Purchaser's  right to actual  damages  for the  Company's  failure  to issue and
deliver the Conversion Shares to the Purchaser.  Furthermore, in addition to any
other  remedy  that may be  available  to the  Purchaser,  in the event that the
Company  fails for any reason to effect  delivery of  Conversion  Shares  within
seven  business  days  after  the date on which the  Company  has  received  the
Original Documentation,  the Purchaser will be entitled to elect to be deemed to
be  treated  as not  having  exercised  the  relevant  Notice of  Conversion  by
delivering a notice to such effect to the Company  whereupon the Company and the
Purchaser shall each be restored to their respective positions immediately prior
to such Notice of Conversion;  provided that no such election  shall  constitute
waiver of any right



                                      -18-


or  remedy  Purchaser  may  have  and  the  Company  shall  still  be  obligated
notwithstanding any such election to make penalty payments hereunder and for any
actual damages.

         19. NON-DELIVERY OF THE SHARES. If, within twenty (20) business days of
the date after receipt by the Company of the Original Documentation, the Company
shall fail to (i) issue the Conversion  Shares and (ii) deliver to the Purchaser
the Conversion  Shares as required by the  Certificate  of  Designation  for any
reason other than failure by the Purchaser to comply with its obligations  under
this Agreement, then the Company shall:

                  (a) hold the  Purchaser  harmless  against any loss,  claim or
damage  arising from or as a result of such  failure by the Company  (including,
without limitation,  any such loss, claim or damage resulting from an obligation
to resell the Conversion Shares); and

                  (b)  reimburse  the  Purchaser  for  all of its  out-of-pocket
expenses reasonably  incurred,  including fees and disbursements of its counsel,
incurred by the Purchaser in connection with this Agreement and the transactions
contemplated herein;  provided however,  that the Company shall not have further
liability to the Purchaser except as provided for in this Section 17.

         20. ESCROW  AGENT.  The Escrow Agent shall not be liable for any action
taken or  omitted  by it in good  faith  and its  liability  hereunder  shall be
limited to liability for gross negligence or willful misconduct on its part. The
Company  and the  Purchaser  agree to save  harmless,  indemnify  and defend the
Escrow Agent for, from and against their respective  share of any loss,  damage,
liability,  judgment,  cost and expense whatsoever,  by reason of, or on account
of, any misrepresentation made to it or its status or activities as Escrow Agent
under this Agreement except for any loss, damage,  liability,  judgment, cost or
expense resulting from gross negligence or willful misconduct on the part of the
Escrow Agent.

                  The Escrow Agent shall not be  responsible  for any failure or
inability of any of the parties to perform or comply with the provisions of this
Agreement, or the agreements delivered in connection herewith.

                  In the performance of its duties  hereunder,  the Escrow Agent
shall be entitled to rely in good faith upon any document  (including  facsimile
transmitted copies of documents), instrument or signature believed by it in good
faith to be  genuine  and to be  signed by any  party  hereto  or an  authorized
officer or agent thereof,  and shall not be required to investigate the truth or
accuracy of any  statement  contained in any such  document or  instrument.  The
Escrow  Agent may assume in good faith  that any person  purporting  to give any
notice in accordance  with the provisions  hereof has been duly authorized to do
so.

                  Each party  hereto  acknowledges  that (a) the Escrow Agent is
not acting as legal counsel to such party in any manner or respect in connection
with the transactions  contemplated by this Agreement,  and (b) the Escrow Agent
is serving as an accommodation to the parties hereto.

                  It is  understood  and further  agreed  that the Escrow  Agent
shall:



                                      -19-


                  (a) be under no duty to enforce  payment  of any  subscription
that is to be paid to and held by it hereunder;

                  (b)  promptly  notify  the  Purchaser  and the  Company of any
discrepancy  between  the amounts set forth on any  statement  delivered  by the
Purchaser and/or the Company and the sum or sums delivered to it therewith;

                  (c) be  under  no duty to  accept  funds,  checks,  drafts  or
instruments  for the payment of money from anyone  other than the Company or the
Purchaser,  or to  give  any  receipt  therefor  except  to the  Company  or the
Purchaser, with a copy in each case to the Company;

                  (d)  be  protected   in  acting  upon  any  notice,   request,
certificate,  approval,  consent or other paper reasonably  believed by it to be
genuine  and to be signed by the  proper  party or parties  (including,  but not
limited to, copies of documents transmitted by facsimile);

                  (e) be permitted  to consult  with counsel of its choice,  and
shall  not be  liable  for any  action  taken,  suffered,  or  omitted  by it in
accordance with the advice of such counsel;  provided,  however, that nothing in
this  subsection  (e), nor any action taken by the Escrow Agent,  or suffered or
omitted by it in  accordance  with the advice of any counsel,  shall relieve the
Escrow  Agent from  liability  for any claims that are  occasioned  by its gross
negligence or willful misconduct;

                  (f) not be bound by any modification,  amendment, termination,
cancellation,  or  rescission  of this  Agreement,  unless  the same shall be in
writing and signed by it;

                  (g) be entitled to refrain  from taking any action  other than
to keep all property held in escrow if it (i) shall be uncertain  concerning its
duties or rights  hereunder,  or (ii) shall have received claims or demands from
any party, or (iii) shall have received  instructions  from the Purchaser and/or
the Company that, in the Escrow Agent's opinion, are in conflict with any of the
provisions of this Agreement, until it shall have received a final judgment by a
court of competent jurisdiction;

                  (h) have no liability for following the instructions herein or
expressly provided for herein, or the written  instructions given jointly by the
Purchaser and/or the Company; and/or

                  (i) have the right, at any time, to resign hereunder by giving
written notice of its resignation to all other parties hereto at least three (3)
business days prior to the date  specified for such  resignation to take effect,
and upon the effective date of such  resignation all cash and other payments and
all other property then held by the Escrow Agent hereunder shall be delivered by
it to such person as may be designated in writing by the other parties executing
this Agreement,  whereupon the Escrow Agent's obligations  hereunder shall cease
and  terminate.  If no  such  person  has  been  designated  by such  date,  all
obligations  of the  Escrow  Agent  hereunder  shall,  nevertheless,  cease  and
terminate.  The Escrow Agent's sole  responsibility  thereafter shall be to keep
safely  all  property  then  held by it and to  deliver  the  same  to a  person
designated by the



                                      -20-


other parties executing this Agreement or in accordance with the directions of a
final order or judgment of a court of competent jurisdiction.

                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]




                                      -21-



                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            DYNAGEN, INC.

                                            By:      /s/ Dhananjay G. Wadekar
                                                     --------------------------
                                            Title:   Executive Vice President
                                                     --------------------------






                                  DYNAGEN, INC.

                          SECURITIES PURCHASE AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Julius Baer Securities Inc.


                                            By:      /s/ [ILLEGIBLE]
                                                     --------------------------
                                            Title:   Managing Director
                                                     --------------------------

                                            Address:     330 Madison Avenue
                                                         ----------------------
                                                         NY NY  10017
                                                         ----------------------




                                                                    EXHIBIT 4.19

                          REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT"),  dated as of June 17,
1997 by and among  DYNAGEN,  INC.,  a Delaware  corporation,  with  headquarters
located at 99 Erie Street, Cambridge,  Massachusetts 02139 (the "Company"),  and
JULIUS  BAER  SECURITIES  INC.,  acting in its  capacity  as agent  for  certain
non-U.S. persons (such non-U.S. persons, the "INITIAL INVESTOR").

         WHEREAS:

         A. In connection  with the Securities  Purchase  Agreement of even date
herewith by and between the  Company  and the Initial  Investor  (the  "PURCHASE
AGREEMENT"),  the  Company  has  agreed,  upon  the  terms  and  subject  to the
conditions  contained  therein,  to issue and sell to the Initial  Investor  (i)
Series B Preferred Stock (the "PREFERRED STOCK") that is convertible into shares
(collectively,  the  "CONVERSION  SHARES") of the  Company's  common  stock (the
"COMMON  STOCK")  , all  upon the  terms  and  subject  to the  limitations  and
conditions set forth in the Certificate of Designation,  and (ii) 225,000 shares
of Common Stock (the "COMMON SHARES"); and

         B. To induce the Initial  Investor to execute and deliver the  Purchase
Agreement,  the Company has agreed to provide certain  registration rights under
the  Securities  Act  of  1933,  as  amended,  and  the  rules  and  regulations
thereunder, or any similar successor statute (collectively, the "1933 ACT");

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  contained  herein  and other  good and  valuable  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the Company and the
Initial Investor hereby agree as follows:

         1.       DEFINITIONS.

                  (a) As used in this Agreement,  the following terms shall have
the following meanings:

                           (i)  "INVESTORS"  means the Initial  Investor and any
transferees  or assignees  who agree to become bound by the  provisions  of this
Agreement in accordance with Section 9 hereof.

                           (ii)  "REGISTER,"  "REGISTERED,"  and  "REGISTRATION"
refer  to a  registration  effected  by  preparing  and  filing  a  Registration
Statement or Statements in compliance with the 1933 Act and pursuant to Rule 415
under the 1933 Act or any successor rule providing for offering  securities on a
continuous  basis ("RULE 415"), and the declaration or ordering of effectiveness
of such  Registration  Statement by the United  States  Securities  and Exchange
Commission (the "SEC").






                           (iii)  "POTENTIALLY  MATERIAL EVENT" means any of the
following:  (a) the possession by the Company of material  information  not ripe
for  disclosure  in a  registration  statement,  which  shall  be  evidenced  by
determinations  in good  faith by the Board of  Directors  of the  Company  that
disclosure  of  such  information  in  the   registration   statement  would  be
detrimental  to the  business  and affairs of the  Company;  or (b) any material
engagement   or  activity  by  the  Company  that  would,   in  the  good  faith
determination of the Board of Directors of the Company, be adversely affected by
disclosure in a registration  statement at such time, which  determination shall
be  accompanied by a good faith  determination  by the Board of Directors of the
Company that the registration  statement would be materially  misleading  absent
the inclusion of such information.

                           (iv)  "REGISTRABLE  SECURITIES"  means the Conversion
Shares  issued or issuable and the Common  Shares,  any shares of capital  stock
issued or issuable as a dividend on or in exchange for or otherwise with respect
to any of the foregoing and any shares of Common Stock issued in connection with
Section 2(b) hereof.

                           (v)  "REGISTRATION  STATEMENT"  means a  registration
statement of the Company under the 1933 Act providing  for  registration  of the
Registrable Securities.

                  (b)  Capitalized  terms used herein and not otherwise  defined
herein shall have the respective meanings set forth in the Purchase Agreement.

         2.       REGISTRATION.

                  (a) Mandatory Registration.  The Company shall, within 45 days
following the Closing Date,  file with the SEC a Registration  Statement on Form
S-3 (or,  if Form S-3 is not then  available  to the  Company,  on such  form of
Registration  Statement  as is  then  available  to  the  Company  to  effect  a
registration  of the  Registrable  Securities,  subject  to the  consent  of the
Initial  Investor (as determined  pursuant to Section l0 hereof),  which consent
will not be unreasonably withheld conditioned or delayed) covering the resale of
the Registrable Securities.  The Registration Statement, to the extent allowable
under the 1933 Act and the Rules  promulgated  thereunder  (including Rule 416),
shall state that such  Registration  Statement  also  covers such  indeterminate
number of additional Conversion Shares as may become issuable upon conversion of
the Preferred Stock or to prevent  dilution  resulting from stock splits,  stock
dividends  or similar  transactions.  The Company  shall use its best efforts to
cause such registration to become and remain effective  (including the taking of
such steps as are necessary to obtain the removal of any stop orders); provided,
however,  that the  Investors  shall  furnish the Company with such  appropriate
information in connection  therewith  (whether  requested  prior to or after the
filing  of the  Registration  Statement  with  the  SEC)  as the  Company  shall
reasonably request in writing. The Registration Statement (and each amendment or
supplement thereto, and each request for acceleration of effectiveness  thereof)
shall be provided to (and subject to the  approval of) the Initial  Investor and
its  counsel  prior to its  filing  or other  submission.  The  Company  further
undertakes to take all steps  necessary to ensure that a Registration  Statement
is,  or  Registration   Statements  are,  effective  at  all  times  during  the
Registration   Period  (as  defined  below)  with  respect  to  all  Registrable
Securities and the resale thereof.



                                      -2-


         (b)  Liquidated  Damages.  The  Company  shall use its best  efforts to
obtain effectiveness of the Registration Statement within 150 days following the
Closing  Date. If (i) the  Registration  Statement(s)  covering the  Registrable
Securities  required to be filed by the Company  pursuant to Section 2(a) hereof
is not declared  effective by the SEC within one hundred  fifty (150) days after
the  Closing  Date of the sale of the  Shares,  or if,  after  the  Registration
Statement  has  been  declared  effective  by  the  SEC,  sales  of  Registrable
Securities  cannot be made  pursuant  Registration  Statement (by reason of stop
order,  the  Company's  failure  to  update  the  Registration  Statement,   the
occurrence of a Potentially  Material  Event, a Company Event (as defined below)
or otherwise),  or (ii) any of the  Registrable  Securities are not  designated,
listed,  or included for  quotation on the NASDAQ  National  Market  System (the
"NASDAQ-NMS"), NASDAQ SmallCap, the New York Stock Exchange (the "NYSE"), or the
American Stock Exchange (the "AMEX"), then the Company will make payments to the
Investors  as  liquidated  damages in such amounts and at such times as shall be
determined  pursuant to this Section  2(b) as partial  relief for the damages to
the  Investor by reason of any such delay in or  reduction  of their  ability to
sell the  Registrable  Securities  (which  remedy  shall not be exclusive of any
other  remedies  available at law or in equity).  The Company  shall pay to each
holder of Registrable  Securities an amount equal to (x) the aggregate  purchase
price paid by the  Investors  for the Shares then held by such  investors and of
which sales  cannot be made  pursuant to the  Registration  Statement or are not
listed,  designated or included for quotation on  NASDAQ-NMS,  NASDAQ  SmallCap,
they NYSE, or AMEX (including,  without  limitation,  Preferred Shares that have
been  converted  into  Conversion  Shares  then  held  by such  Investors)  (the
"Aggregate Share Price")  multiplied by (y) two and one-half  hundredths  (.025)
multiplied  by (z) the sum of (i) the  number of months  (prorated  for  partial
months)  after  the end of  such  150-day  period  and  prior  to the  date  the
Registration Statement is declared effective by the SEC; provided, however, that
there shall be excluded form such period any delays that are solely attributable
to changes required by the Investors in the Registration  Statement with respect
to information relating to the Investors, including, without limitation, changes
to the plan of distribution, or to the failure of the Investors to conduct their
review  of the  registration  statement  pursuant  to  Section  2(a)  above in a
reasonably  prompt manner;  plus (ii) the number of months (prorated for partial
months) that sales cannot be made pursuant to the  Registration  Statement after
the Registration Statement has been declared effective; plus (iii) the number of
months  (prorated  for partial  months)  that the Common  Stock is not listed or
included for quotation on the NASDAQ-NMS,  NASDAQ  SmallCap,  NYSE or AMEX after
the Registration  Statement has been declared  effective.  (For example,  if the
Registration  Statement  becomes  effective  one (1) month after the end of such
150-day  period,  the Company would pay $25,000 for each $1,000,000 of Aggregate
Share Price and would  continue to pay $25,000 for each  $1,000,000 of Aggregate
Share Price until the Registration  Statement  becomes  effective.) Such amounts
shall  be  paid in cash  or,  at each  Investor's  option  (but  subject  to the
limitations  contained  Article 5 of the  Certificate of  Designations),  may be
convertible into Common Stock at the "Series B Conversion  Price" (as defined in
the  Certificate  of  Designations).  Any  shares of Common  Stock  issued  upon
conversion  of such amounts  shall be  Registrable  Securities.  If the Investor
desires to convert the amounts due hereunder  into  Registrable  Securities,  it
shall so notify the Company in writing  within two (2) business days of the date
on which such  amounts are first  payable in cash and such  amounts  shall be so
convertible  (pursuant  to  the  mechanics  set  forth  in  the  Certificate  of
Designations),  beginning  on the last  day upon


                                      -3-


which the cash amount would  otherwise be due in  accordance  with the following
sentence.  Payments of cash  pursuant  hereto shall be made within ten (10) days
after the end of each period that gives rise to such obligation,  provided that,
if any such period  extends for more than  thirty  (30) days,  interim  payments
shall be made for each such thirty (30) day period.  Notwithstanding anything to
the  contrary  set forth  above in this  Section  2(b),  if the  payment of cash
liquidated  damages by the  Company  would  cause the  Company  to  violate  any
covenant  under any  agreement  entered  into in  connection  with the  Superior
Transaction  (as defined in the  Purchase  Agreement),  then for so long as such
payment would cause such violation,  the Company may pay any liquidated  damages
required  hereunder  in shares of Common  Stock,  valued at the  average  of the
closing bid price of the Common Stock as recorded by the NASDAQ  SmallCap market
for the five trading days preceding the payment date required by the immediately
preceding  sentence.  Any of such  shares of  Common  Stock  paid as  liquidated
damages shall be Registrable Securities.

                  (c)  Eligibility  for Form S-3.  The  Company  represents  and
warrants that, as of the date hereof,  it meets the  requirements for the use of
Form  S-3 for  registration  of the  sale by the  Investors  of the  Registrable
Securities  and the Company  shall file all reports  required to be filed by the
Company with the SEC in a timely manner so as to maintain such  eligibility  for
the use of Form S-3.

         3.       OBLIGATIONS OF THE COMPANY.

         In connection with the registration of the Registrable Securities,  the
Company shall have the following obligations:

                  (a) The Company  shall  within 45 days  following  the Closing
Date  prepare  and file  promptly  with  the SEC a  Registration  Statement  and
thereafter use its best efforts to cause such  Registration  Statement to become
effective  within 150 days following the Closing Date, and keep the Registration
Statement  effective pursuant to Rule 415 at all times until such date as is the
earlier  of (i) the date on which all of the  Registrable  Securities  have been
sold and no shares of Preferred  Stock are  outstanding,  (ii) the date on which
all of the  Registrable  Securities  (in the  opinion of counsel to the  Initial
Investor) may be immediately sold without  registration and (iii) two years from
the Closing  Date (the  "REGISTRATION  PERIOD"),  which  Registration  Statement
(including  any  amendments or supplements  thereto and  prospectuses  contained
therein and all documents  incorporated by reference  therein) shall not contain
any  untrue  statement  of a  material  fact or omit to  state a  material  fact
required to be stated therein,  or necessary to make the statements  therein not
misleading.  The Company shall furnish to the Investors,  in accordance with the
notice provisions of Section 11(b) hereof,  copies of reasonably complete drafts
of all such documents proposed to be filed (including exhibits, if any), and any
such Investor shall have the  opportunity  to object,  within three (3) business
days, to any information  pertaining to such Investor that is contained  therein
and the Company will make the corrections  reasonably requested by such Investor
with respect to such information prior to filing any such Registration Statement
or amendment.



                                      -4-


                  (b) The  Company  shall  prepare  and  file  with the SEC such
amendments  (including   post-effective   amendments)  and  supplements  to  the
Registration   Statement  and  the  prospectus   used  in  connection  with  the
Registration  Statement as may be necessary to keep the  Registration  Statement
effective at all times during the Registration  Period.  Without limiting any of
the  Company's  obligations  under  this  Agreement,  in the event the number of
shares of Common Stock covered for resale by the Investors  under a Registration
Statement  filed pursuant to this Agreement is  insufficient to cover all of the
Registrable  Securities  (a  "Company  Event"),  the  Company  shall  amend  the
Registration  Statement, or file a new Registration Statement (on the short form
available  therefore,  if  applicable),  or  both,  so as to  cover  all  of the
Registrable Securities,  in each case, as soon as practicable,  but in any event
within  forty-five  (45) days after the necessity  therefor arises (based on the
market price of the Common Stock and other relevant factors on which the Company
reasonably elects to rely). The Company shall use its best efforts to cause such
amendment  and/or new  Registration  Statement  to become  effective  as soon as
practicable following the filing thereof. During any period when a Company Event
has occurred and is  continuing,  the Company  shall pay  liquidated  damages as
provided for in Section 2(b) hereof.

                  (c) The Company shall furnish,  in accordance  with the notice
provisions  of  Section  11(b)  hereof,   to  each  Investor  whose  Registrable
Securities are included in the  Registration  Statement and to its legal counsel
(i) promptly after the same is prepared and publicly distributed, filed with the
SEC or received by the Company,  one copy of the Registration  Statement and any
amendment thereto, each preliminary prospectus and prospectus and each amendment
or supplement thereto,  and, in the case of the Registration  Statement referred
to in Section  2(a),  each letter  written by or on behalf of the Company to the
SEC or the staff of the SEC, and each material item of  correspondence  from the
SEC or the  staff  of the  SEC,  in each  case  relating  to  such  Registration
Statement  (other than any portion  thereof that contains  information for which
the Company has sought confidential  treatment),  and (ii) such number of copies
of a prospectus,  including a preliminary  prospectus,  and all  amendments  and
supplements  thereto and such other  documents as such  Investor may  reasonably
request in order to facilitate  the  disposition of the  Registrable  Securities
owned by such Investor.

                  (d) The Company shall use its best efforts to (i) register and
qualify the Registrable  Securities covered by the Registration  Statement under
such other  securities  or "blue sky" laws of such  jurisdictions  in the United
States as the  Investors  who hold a majority  in  interest  of the  Registrable
Securities  being  offered  reasonably  request,  (ii) prepare and file in those
jurisdictions  such  amendments   (including   post-effective   amendments)  and
supplements  to such  registrations  and  qualifications  as may be necessary to
maintain the effectiveness  thereof during the Registration  Period,  (iii) take
such other  actions as may be  necessary  to  maintain  such  registrations  and
qualifications in effect at all times during the Registration  Period,  and (iv)
take all  other  actions  reasonably  necessary  or  advisable  to  qualify  the
Registrable Securities for sale in such jurisdictions;  provided,  however, that
the  Company  shall not be required in  connection  therewith  or as a condition
thereto  (a) to qualify to do business  in any  jurisdiction  where it would not
otherwise  be  required  to qualify but for this  Section  3(d),  (b) to subject
itself  to  general  taxation  in any such  jurisdiction,  (c) to file a general
consent  to service of  process  in any such  jurisdiction,  (d) to provide  any
undertakings  that cause the Company undue expense or burden, or



                                      -5-


(e) to make any change in its  charter or bylaws  that in each case the Board of
Directors of the Company  determines to be contrary to the best interests of the
Company and its  stockholders.  The Company shall promptly  notify each Investor
who  holds  Registrable  Securities  of  the  receipt  by  the  Company  of  any
notification with respect to the suspension of the registration or qualification
of any of the Registrable Securities for sale under the securities or "blue sky"
laws of any jurisdiction in the United States or its receipt of actual notice of
the initiation or threatening of any proceeding for such purpose.

                  (e) Notwithstanding the foregoing, if at any time or from time
to time  after the date of  effectiveness  of the  Registration  Statement,  the
Company  notifies  the  Investors in writing of the  existence of a  Potentially
Material Event, the Investors shall not offer or sell any Registrable Shares, or
engage in any other transaction involving or relating to the Registrable Shares,
from the time of the giving of notice  with  respect to a  Potentially  Material
Event until such  Investor  receives  written  notice from the Company that such
Potentially  Material Event either has been disclosed to the public or no longer
constitutes a Potentially Material Event;  provided,  however,  that the Company
may not so suspend the right to such holders of Registrable Shares for more than
90 days in the  aggregate  during  any  12-month  period  during  the period the
Registration  Statement is required to be in effect.  Liquidated  damages  shall
continue to accrue  pursuant to Section 2(b) hereof during any such  Potentially
Material Event.

                  (f) The  Company  shall use its best  efforts to  prevent  the
issuance  of  any  stop  order  or  other   suspension  of  effectiveness  of  a
Registration  Statement,  and,  if  such an  order  is  issued,  to  obtain  the
withdrawal  of such order at the  earliest  possible  moment and to notify  each
Investor  who holds  Registrable  Securities  being sold (or, in the event of an
underwritten  offering, the managing underwriters) of the issuance of such order
and the resolution thereof.

                  (g) The Company shall make available for inspection by (i) any
Investor, (ii) any underwriter  participating in any disposition pursuant to the
Registration Statement,  (iii) one firm of attorneys and one firm of accountants
or other agents retained by the Initial Investor, and (iv) one firm of attorneys
retained by all such underwriters (collectively, the "INSPECTORS") all pertinent
financial and other records, and pertinent corporate documents and properties of
the  Company  (collectively,  the  "RECORDS")  as  shall  be  reasonably  deemed
necessary  by each  Inspector  to enable  each  Inspector  to  exercise  its due
diligence  responsibility,  and  cause the  Company's  officers,  directors  and
employees to supply all  information  that any Inspector may reasonably  request
for purposes of such due diligence; provided, however, that each Inspector shall
hold in  confidence  and shall not make any  disclosure  of any  Record or other
information that the Company determines in good faith to be confidential, and of
which determination the Inspectors are so notified, unless (a) the disclosure of
such Records is  determined  to be necessary by the Investors and the Company to
avoid or correct a misstatement or omission in any Registration  Statement,  (b)
the  release of such  Records is ordered  pursuant  to a subpoena or other order
from  a  court  or  government  body  of  competent  jurisdiction,  or  (c)  the
information  in such  Records has been made  generally  available  to the public
other  than by  disclosure  in  violation  of this or any other  agreement.  The
Company shall not be required to disclose any  confidential  information in such
Records to any Inspector until and unless such Inspector shall have entered into
confidentiality  agreements (in form and substance  satisfactory to the Company)
with the Company



                                      -6-


with respect thereto,  containing terms substantially similar to those contained
in this Section  3(g).  Each Investor  agrees that it shall,  upon learning that
disclosure  of such Records is sought in or by a court or  governmental  body of
competent jurisdiction or through other means, give prompt notice to the Company
and allow the  Company,  at its  expense,  to  undertake  appropriate  action to
prevent  disclosure of, or to obtain a protective  order for, the Records deemed
confidential.  Nothing herein shall be deemed to limit the Investor's ability to
sell  Registrable  Securities  in a manner  that is  otherwise  consistent  with
applicable laws and regulations.

                  (g) The  Company  shall  hold in  confidence  and not make any
disclosure of information  concerning an Investor provided to the Company unless
(i) disclosure of such  information is necessary to comply with federal or state
securities   laws,  or  other  applicable  law,  (ii)  the  disclosure  of  such
information is necessary to avoid or correct a  misstatement  or omission in any
Registration  Statement,  (iii)  the  release  of such  information  is  ordered
pursuant  to a  subpoena  or other  order from a court or  governmental  body of
competent  jurisdiction,  or (iv)  such  information  has  been  made  generally
available  to the public  other than by  disclosure  in violation of this or any
other agreement. The Company agrees that it shall, upon learning that disclosure
of such  information  concerning  an  Investor  is  sought  in or by a court  or
governmental body of competent  jurisdiction or through other means, give prompt
notice to such Investor prior to making such disclosure, and allow the Investor,
at its expense, to undertake  appropriate action to prevent disclosure of, or to
obtain a protective order for, such information.

                  (i) The  Company  shall use its best  efforts  to  secure  the
listing,  designation  and  inclusion  for  quotation  of  all  the  Registrable
Securities covered by the Registration  Statement on the NASDAQ SmallCap Market,
if the listing of such Registrable  Securities is then permitted under the rules
and  regulations  of such  market.  To the extent  that the Company is unable to
secure such designation and quotation of any Registrable Securities,  liquidated
damages  shall accrue on such  Registrable  Securities  pursuant to Section 2(b)
hereof.

                  (j) The Company shall provide a transfer  agent and registrar,
which may be a single entity, for the Registrable  Securities not later than the
effective date of the Registration Statement.

                  (k) The Company  shall  cooperate  with the Investors who hold
Registrable   Securities   being  offered  and  the  managing   underwriter   or
underwriters,  if any, to  facilitate  the timely  preparation  and  delivery of
certificates  (not bearing any  restrictive  legends)  representing  Registrable
Securities  to be sold  pursuant to the  Registration  Statement and enable such
certificates to be in such denominations or amounts,  as the case may be, as the
managing  underwriter or  underwriters,  if any, or the Investors may reasonably
request  and   registered  in  such  names  as  the  managing   underwriter   or
underwriters, if any, or the Investors may request.

                  (l) The  Company  shall  use its best  efforts  to  cause  all
Registrable  Securities covered by such registration  statement to be registered
with or approved by such other  governmental  agencies or  authorities as may be
necessary to enable each holder thereof to consummate disposition of Registrable
Securities.



                                      -7-


         4.       OBLIGATIONS OF THE INVESTORS.

         In connection with the registration of the Registrable Securities,  the
Investors shall have the following obligations:

                  (a) It shall be a condition  precedent to the  obligations  of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable  Securities of a particular Investor that such Investor shall
furnish to the  Company  such  information  regarding  itself,  the  Registrable
Securities  held by it and the intended method of disposition of the Registrable
Securities held by it as shall be reasonably required to effect the registration
of such Registrable Securities.

                  (b)  Each  Investor,  by  such  Investor's  acceptance  of the
Registrable  Securities,  agrees to  cooperate  with the  Company as  reasonably
requested by the Company in connection  with the  preparation  and filing of the
Registration Statement hereunder,  unless such Investor has notified the Company
in  writing  of such  Investor's  election  to  exclude  all of such  Investor's
Registrable Securities from the Registration Statement.

                  (c) Each Investor agrees that, upon receipt of any notice from
the  Company of the  happening  of  Potentially  Material  Event as set forth in
Section  3(e),  such  Investor  will  immediately   discontinue  disposition  of
Registrable  Securities  pursuant to the  Registration  Statement  covering such
Registrable  Securities,   and  shall  be  entitled  to  liquidated  damages  in
accordance  with Section 2(b) hereof,  until such  Investor  receives  notice in
accordance  with Section  3(e)  providing  for the  disposition  of  Registrable
Securities in accordance with the Registration Statement.

                  (d) Without limiting an Investor's  rights under Section 2(a),
no Investor may participate in any  underwritten  distribution  hereunder unless
such Investor (i) agrees to sell such Investor's  Registrable  Securities on the
basis  provided in any  underwriting  arrangements  in usual and customary  form
entered into by the Company,  (ii)  completes  and executes all  questionnaires,
powers of attorney,  indemnities,  underwriting  agreements and other  documents
reasonably required under the terms of such underwriting arrangements, and (iii)
agrees to pay its pro rata share of all  underwriting  discounts and commissions
and any expenses in excess of those payable by the Company pursuant to Section 5
below.

                  (e) Each Investor whose Registrable Securities are included in
a Registration Statement understands that the 1933 Act may require delivery of a
prospectus relating thereto in connection with any sale thereof pursuant to such
Registration  Statement and each such  Investor  shall use its  reasonable  best
efforts to comply with the applicable  prospectus  delivery  requirements of the
1933 Act in connection with any such sale.

                  (f) Each Investor agrees to notify the Company  promptly,  but
in any  event  within  seventy-two  (72)  hours  after  the  date on  which  all
Registrable  Securities  owned by such Investor have been sold by such Investor,
so that the Company may comply with its obligation to



                                      -8-


terminate the  Registration  Statement in accordance with Item 512 of Regulation
S-K or Regulation S-B, as the case may be.

         5.       EXPENSES OF REGISTRATION.

         All  reasonable  expenses,   other  than  underwriting   discounts  and
commissions,   incurred   in   connection   with   registrations,   filings   or
qualifications pursuant to Sections 2 and 3, including all registration, listing
and  qualifications  fees,  printers  and  accounting  fees  and  the  fees  and
disbursements  of counsel for the Company,  shall be borne by the  Company.  All
fees and disbursements of counsel to the holders of Registrable Securities,  any
expenses  incurred by holders of the  Registrable  Securities as a result of any
investigation   pursuant  to  Section  3(g),  any  underwriting   discounts  and
commissions and all other expenses of such holders not contained in the previous
sentence shall be borne by the holders of Registrable Securities.

         6.       INDEMNIFICATION.

         In the event any Registrable  Securities are included in a Registration
Statement under this Agreement:

                  (a)  To  the  extent   permitted  by  law,  the  Company  will
indemnify,  hold  harmless  and  defend  (i) each  Investor  who is a seller  of
Registrable Securities under the Registration Statement, and (ii) the directors,
officers,  partners,  employees,  agents and each person who  controls  any such
Investor  within the meaning of the 1933 Act or the  Securities  Exchange Act of
1934,  as amended  (the "1934 ACT"),  if any (each,  an  "INDEMNIFIED  PERSON"),
against any joint or several losses,  claims,  damages,  liabilities or expenses
(collectively, together with actions, proceedings or inquiries by any regulatory
or  self-regulatory  organization,  whether commenced or threatened,  in respect
thereof,  "CLAIMS")  to which any of them may  become  subject  insofar  as such
Claims  arise out of or are based  upon:  (i) any  untrue  statement  or alleged
untrue statement of a material fact in a Registration  Statement or the omission
or alleged  omission to state  therein a material  fact required to be stated or
necessary  to make the  statements  therein  not  misleading  or (ii) any untrue
statement  or alleged  untrue  statement  of a material  fact  contained  in any
preliminary  prospectus if used prior to the effective date of such Registration
Statement, or contained in the final prospectus (as amended or supplemented,  if
the Company files any amendment  thereof or supplement  thereto with the SEC) or
the omission or alleged omission to state therein any material fact necessary to
make the statements made therein,  in light of the circumstances under which the
statements  therein were made,  not  misleading  (the  matters in the  foregoing
clauses  (i)  and  (ii)  being,  collectively,  "VIOLATIONS").  Subject  to  the
restrictions  set forth in  Section  6(c) with  respect  to the  number of legal
counsel,  the Company shall reimburse the Investors and each such underwriter or
controlling  person,  promptly as such  expenses  are  incurred  and are due and
payable,  for any reasonable legal fees or other reasonable expenses incurred by
them  in   connection   with   investigating   or  defending   any  such  Claim.
Notwithstanding  anything to the contrary contained herein, the  indemnification
agreement contained in this Section 6(a): (i) shall not apply to a Claim arising
out of or based upon a Violation  that occurs in reliance upon and in conformity
with information  furnished in writing to the Company by any Indemnified  Person
expressly  for  use in  connection  with  the  preparation  of the  Registration
Statement,



                                      -9-


preliminary  prospectus  or  final  prospectus,  or  any  amendment  thereof  or
supplement  thereto;  (ii) shall not apply to amounts paid in  settlement of any
Claim if such  settlement is effected  without the prior written  consent of the
Company,  which  consent  shall not be  unreasonably  withheld;  and (iii)  with
respect to any  preliminary  prospectus,  shall not inure to the  benefit of any
Indemnified  Person  if the  untrue  statement  or  omission  of  material  fact
contained in the  preliminary  prospectus was corrected on a timely basis in the
prospectus,  as then amended or supplemented,  if such corrected  prospectus was
timely made  available  by the Company  pursuant to Section  3(c)  hereof.  Such
indemnity shall remain in full force and effect  regardless of any investigation
made by or on behalf of the Indemnified Person and shall survive the transfer of
the Registrable Securities by the Investors pursuant to Section 9.

                  (b) In connection with any Registration  Statement in which an
Investor is  participating,  each such Investor agrees severally and not jointly
to  indemnify,  hold  harmless  and  defend,  to the same extent and in the same
manner set forth in Section 6(a), the Company,  each of its  directors,  each of
its  officers who signs the  Registration  Statement,  each person,  if any, who
controls the Company within the meaning of the 1933 Act or the 1934 Act, and any
other stockholder selling securities  pursuant to the Registration  Statement or
any of its  directors  or officers or any person who controls  such  stockholder
within  the  meaning  of  the  1933  Act  or  the  1934  Act  (collectively,  an
"INDEMNIFIED PARTY"), against any Claim to which any of them may become subject,
under the 1933 Act, the 1934 Act or otherwise,  insofar as such Claim arises out
of or is based upon any  Violation,  in each case to the extent (and only to the
extent)  that  such  Violation  occurs  in  reliance  upon  written  information
furnished to the Company by such Investor  expressly for use in connection  with
such Registration Statement,  preliminary prospectus or final prospectus, or any
amendment or supplement thereto;  and subject to Section 6(c) such Investor will
reimburse  any legal or other  expenses  (promptly as such expenses are incurred
and  are due and  payable)  reasonably  incurred  by  them  in  connection  with
investigating or defending any such Claim; provided, however, that the indemnity
agreement  contained  in this  Section  6(b) shall not apply to amounts  paid in
settlement of any Claim if such settlement is effected without the prior written
consent of such  Investor,  which  consent shall not be  unreasonably  withheld;
provided,  further,  however,  that the  Investor  shall be  liable  under  this
Agreement  (including  this  Section 6(b) and Section 7) for only that amount as
does not exceed the net  proceeds  to such  Investor  as a result of the sale of
Registrable Securities pursuant to such Registration  Statement.  Such indemnity
shall remain in full force and effect regardless of any investigation made by or
on  behalf of such  Indemnified  Party and shall  survive  the  transfer  of the
Registrable  Securities by the Investors pursuant to Section 9.  Notwithstanding
anything  to  the  contrary  contained  herein,  the  indemnification  agreement
contained in this Section 6(b) with respect to any preliminary  prospectus shall
not inure to the benefit of any  Indemnified  Party if the untrue  statement  or
omission of material fact contained in the preliminary  prospectus was corrected
on a timely basis in the prospectus, as then amended or supplemented.

                  (c)  Promptly  after  receipt  by  an  Indemnified  Person  or
Indemnified  Party  under this  Section 6 of notice of the  commencement  of any
action  (including  any  governmental   action),   such  Indemnified  Person  or
Indemnified Party shall, if a Claim in respect thereof is to be made against any
indemnifying  party under this  Section 6, deliver to the  indemnifying  party a
written notice of the commencement  thereof,  and the  indemnifying  party shall
have the right to participate



                                      -10-


in, and, to the extent the indemnifying party so desires, jointly with any other
indemnifying party similarly  noticed,  to assume control of the defense thereof
with counsel mutually satisfactory to the indemnifying party and the Indemnified
Person or the Indemnified Party, as the case may be; provided,  however, that an
Indemnified  Person or Indemnified  Party shall have the right to retain its own
counsel with the fees and expenses to be paid by the indemnifying  party, if, in
the  reasonable  opinion of counsel  retained  by the  indemnifying  party,  the
representation  by such counsel of the Indemnified  Person or Indemnified  Party
and the  indemnifying  party would be  inappropriate  due to actual or potential
differing interests between such Indemnified Person or Indemnified Party and any
other party  represented by such counsel in such  proceeding.  The  indemnifying
party shall pay for only one separate legal counsel for the Indemnified  Persons
or the  Indemnified  Parties,  as  applicable,  and such legal  counsel shall be
selected  by  Investors  holding  a  majority-in-interest   of  the  Registrable
Securities included in the Registration Statement to which the Claim relates, if
the Investors are entitled to indemnification  hereunder,  or by the Company, if
the Company is entitled to indemnification hereunder, as applicable. The failure
to deliver written notice to the indemnifying  party within a reasonable time of
the commencement of any such action shall not relieve such indemnifying party of
any liability to the Indemnified  Person or Indemnified Party under this Section
6, except to the extent that the  indemnifying  party is actually  prejudiced in
its ability to defend such action. The indemnification  required by this Section
6 shall be made by periodic  payments of the amount thereof during the course of
the  investigation  or defense,  as such expense,  loss,  damage or liability is
incurred and is due and payable.

         7.       CONTRIBUTION.

         To  the  extent  any   indemnification  by  an  indemnifying  party  is
prohibited or limited by law, the indemnifying  party agrees to make the maximum
contribution  with respect to any amounts for which it would otherwise be liable
under Section 6 to the fullest extent permitted by law; provided,  however, that
(i) no contribution shall be made under  circumstances where the maker would not
have been  liable for  indemnification  under the fault  standards  set forth in
Section  6, (ii) no  seller  of  Registrable  Securities  guilty  of  fraudulent
misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be
entitled to  contribution  from any person who was not guilty of such fraudulent
misrepresentation,  and (iii) contribution (together with any indemnification or
other obligations under this Agreement) by any seller of Registrable  Securities
shall be limited in amount to the amount of  proceeds  received  by such  seller
from the sale of such Registrable Securities.

         8.       REPORTS UNDER THE 1934 ACT.

         With a view to making  available to the  Investors the benefits of Rule
144  promulgated  under the 1933 Act or any other  similar rule or regulation of
the SEC that may at any time  permit the  Investors  to sell  securities  of the
Company to the public without registration ("RULE 144"), the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144;



                                      -11-



                  (b) use its  best  efforts  to file  with  the SEC in a timely
manner all reports and other  documents  required of the Company  under the 1933
Act and the 1934 Act so long as the Company remains subject to such requirements
and the filing of such  reports and other  documents is required for the sale of
the Registrable Securities pursuant to Rule 144; and

                  (c)  furnish to each  Investor so long as such  Investor  owns
Registrable  Securities,  promptly upon request,  (i) a written statement by the
Company that it has complied  with the reporting  requirements  of Rule 144, the
1933 Act and the 1934 Act,  (ii) a copy of the most recent  annual or  quarterly
report of the  Company  and such other  reports  and  documents  so filed by the
Company,  and (iii) such other  information  as may be  reasonably  requested to
permit  the  Investors  to sell such  securities  pursuant  to Rule 144  without
registration.

         9.       ASSIGNMENT OF REGISTRATION RIGHTS.

         The rights of an Investor  hereunder,  including  the right to have the
Company register  Registrable  Securities  pursuant to this Agreement,  shall be
automatically  assignable by each Investor to (a) any transferee of at least 30%
of the Preferred Stock and/or Common Shares, or Registrable Securities or (b) up
to but no more than five  persons  proved  that in any  case,  (i) the  Investor
agrees in writing with the transferees or assignees to assign such rights, and a
copy of such  agreement  is furnished  to the Company  within a reasonable  time
after such assignment,  (ii) the Company is, within a reasonable time after such
transfer  or  assignment,  furnished  with  written  notice  of (a) the name and
address of such transferees or assignees, and (b) the securities with respect to
which  such  registration  rights  are  being  transferred  or  assigned,  (iii)
following  such  transfer  or  assignment,   the  further  disposition  of  such
securities by the  transferee  or assignee is restricted  under the 1933 Act and
applicable  state  securities  laws,  (iv) at or  before  the time  the  Company
receives the written notice  contemplated  by clause (ii) of this sentence,  the
transferees or assignees agree in writing with the Company to be bound by all of
the  provisions  contained  herein,  (v) such  transfer  shall have been made in
accordance with the applicable requirements of the Purchase Agreement,  and (vi)
such transferees shall be an "accredited  investor" as that term defined in Rule
501 of Regulation D promulgated under the 1933 Act.

         10.      AMENDMENT OF REGISTRATION RIGHTS.

         Provisions of this Agreement may be amended and the observance  thereof
may  be  waived  (either  generally  or  in a  particular  instance  and  either
retroactively  or  prospectively),  only with written consent of the Company and
Investors  who hold at  least a  majority  of the  Registrable  Securities.  Any
amendment or waiver effected in accordance with this Section 10 shall be binding
upon each Investor and the Company.

         11.      MISCELLANEOUS.

                  (a) A person or entity is deemed to be a holder of Registrable
Securities  whenever  such  person or entity  owns of  record  such  Registrable
Securities.  If  the  Company  receives  conflicting  instructions,  notices  or
elections  from  two or more  persons  or  entities  with



                                      -12-


respect to the same Registrable Securities, the Company shall act upon the basis
of instructions,  notice or election  received from the registered owner of such
Registrable Securities.

                  (b) Notices  required or permitted to be given hereunder shall
be in  writing  and shall be deemed to be  sufficiently  given  when  personally
delivered  (by hand or by courier) or sent by facsimile  or reputable  overnight
courier service,

         If to the Company, to:

                  DynaGen, Inc.
                  99 Erie Street
                  Cambridge, MA  02139
                  Attention:  President

                  Telephone:        (617) 491-2527
                  Telecopy:         (617) 354-3902

         If to the Initial Investor, to:

                  Julius Baer Securities Inc.
                  330 Madison Avenue
                  New York, NY  10017

                  Telecopy:         (212) 697-5322

or at such  other  address  as each such  party  furnishes  by  notice  given in
accordance  with this Section  11(b),  and shall be effective,  when  personally
delivered,  upon  receipt  and,  when so sent by  facsimile,  the  time and date
indicated by accurate electronic confirmation generated by the sending facsimile
machine,  and when so sent by  reputable  overnight  courier  service,  the next
business day after sending.

                  (c) Failure of any party to exercise any right or remedy under
this  Agreement or otherwise,  or delay by a party in  exercising  such right or
remedy, shall not operate as a waiver thereof

                  (d)  This  Agreement  shall  be  enforced,   governed  by  and
construed in  accordance  with the laws of the State of Delaware  applicable  to
agreements  made and to be performed  entirely  within such State.  In the event
that any  provision  of this  Agreement  is invalid or  unenforceable  under any
applicable  statute  or  rule  of law,  then  such  provision  shall  be  deemed
inoperative  to the extent that it may  conflict  therewith  and shall be deemed
modified to conform with such statute or rule of law. Any provision  hereof that
may prove invalid or  unenforceable  under any law shall not affect the validity
or enforceability of any other provision hereof.

                  (e) This Agreement and the Purchase  Agreement  (including all
schedules  and  exhibits  thereto)  constitute  the entire  agreement  among the
parties hereto with respect to the



                                      -13-


subject  matter  hereof  and  thereof.  There  are  no  restrictions,  promises,
warranties or undertakings, other than those set forth or referred to herein and
therein.  This  Agreement,  the  Certificate  of  Designation  and the  Purchase
Agreement  supersede all prior agreements and  understandings  among the parties
hereto with respect to the subject matter hereof and thereof.

                  (f)  Subject to the  requirements  of  Section 9 hereof,  this
Agreement  shall inure to the benefit of and be binding upon the  successors and
assigns of each of the parties hereto.

                  (g) The  headings in this  Agreement  are for  convenience  of
reference only and shall not limit or otherwise affect the meaning hereof.

                  (h)  This   Agreement   may  be   executed   in  two  or  more
counterparts,  each of which shall be deemed an original  but all of which shall
constitute one and the same agreement. This Agreement, once executed by a party,
may be delivered to the other party hereto by facsimile  transmission  of a copy
of this  Agreement  bearing  the  signature  of the  party  so  delivering  this
Agreement.

                  (i) Each party shall do and  perform,  or cause to be done and
performed,  all such further acts and things,  and shall execute and deliver all
such other  agreements,  certificates,  instruments and documents,  as the other
party may reasonably request in order to carry out the intent and accomplish the
purposes of this Agreement and the consummation of the transactions contemplated
hereby.

                  (j) All  consents and other  determinations  to be made by the
Investors  pursuant to this Agreement  shall be made by the Investors  holding a
majority of the Registrable Securities (determined as if all shares of Preferred
Stock then outstanding had been converted into Registrable Securities).

                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]



                                      -14-






                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            DYNAGEN, INC.

                                            By:     /s/ Dhananjay G. Wadekar
                                                    ---------------------------
                                            Title:  Executive Vice President
                                                    ---------------------------




                                  DYNAGEN, INC.

                          REGISTRATION RIGHTS AGREEMENT

                           Counterpart Signature Page


         If you are in  agreement  with the  foregoing,  please sign the form of
acceptance on the enclosed  counterpart of this Agreement and return the same to
the Company,  whereupon,  this Agreement shall become a binding  Agreement among
us.

                                            Very truly yours,

                                            Julius Baer Securities Inc.


                                            By:     /s/ [ILLEGIBLE]
                                                    ---------------------------
                                            Title:  Managing Director
                                                    ---------------------------



                                                                    EXHIBIT 4.20

                             STOCK PURCHASE WARRANT

         This  Warrant  is  issued  this  18th day of June,  1997,  by  SUPERIOR
PHARMACEUTICAL  COMPANY, an Ohio corporation (the "Company"),  to SIRROM CAPITAL
CORPORATION,  a  Tennessee  corporation  (SIRROM  CAPITAL  CORPORATION  and  any
subsequent   assignee  or  transferee   hereof  are   hereinafter   referred  to
collectively as "Holder" or "Holders").


                                   AGREEMENT:

         1.       ISSUANCE OF WARRANT;  TERM. For and in consideration of SIRROM
CAPITAL CORPORATION making a loan to DynaGen,  Inc., a Delaware  corporation and
sole  shareholder  of the  Company  in an amount of Two  Million  and  no/100ths
Dollars  ($2,000,000.00)  pursuant to the terms of a secured  promissory note of
even date herewith (the "Note") and related loan agreement of even date herewith
(the "Loan  Agreement") and other good and valuable  consideration,  the receipt
and sufficiency of which are hereby  acknowledged,  the Company hereby grants to
Holder the right to purchase  shares of the Company's  common stock (the "Common
Stock"),  which  equals 10% of the  capital  stock of the Company on the date of
exercise.  The shares of Common Stock issuable upon exercise of this Warrant are
hereinafter  referred to as the "Shares."  This Warrant shall be  exercisable at
any time and from time to time after such time as that  certain  Stock  Purchase
Warrant of even date  herewith  issued by DynaGen,  Inc.  in favor of  Holder(s)
("Parent  Warrant") has been  terminated  and this Warrant  substituted  for the
Parent Warrant, but not later than August 31, 2002 (the "Expiration Date").

         2.       EXERCISE PRICE. The exercise price (the "Exercise  Price") per
share for which all or any of the Shares may be purchased  pursuant to the terms
of this Warrant shall be One Cent ($.01).

         3.       EXERCISE.

                  (a) This Warrant may be  exercised  by the Holder  hereof (but
         only  on  the  conditions  hereinafter  set  forth)  as to  all  or any
         increment or  increments of One Hundred (100) Shares (or the balance of
         the Shares if less than such number),  upon delivery of written  notice
         of intent to exercise to the Company at the following address:  99 Erie
         Street,  Cambridge,  Massachusetts  02139 or such other  address as the
         Company  shall  designate  in a written  notice to the  Holder  hereof,
         together  with this Warrant and payment to the Company of the aggregate
         Exercise Price of the Shares so purchased.  The Exercise Price shall be
         payable,  at the option of the Holder,  (i) by certified or bank check,
         or (ii) by the  surrender  of the Note or  portion  thereof  having  an
         outstanding principal balance equal to the aggregate Exercise Price. In
         addition to and  without  limiting  the rights of the Holder  under the
         terms of this Warrant, the Holder shall have the right (the "Conversion
         Right") to convert this  Warrant or any portion  thereof into shares of
         Common Stock as provided in this Section at any time or from









         time to time  prior  to its  expiration.  In  lieu of  exercising  this
         Warrant for cash,  the Holder may elect to  surrender a portion of this
         Warrant for  conversion  and to receive shares of Common Stock equal to
         the value of this Warrant (or the portion being cancelled,  surrendered
         and  converted)  by surrender  of this Warrant to the Company  together
         with notice of such election.  Upon such event, the Company shall issue
         to the Holder a number of shares of the Company's Common Stock computed
         by using the following formula:

                                  X = Y (A - B)
                                 ---------------
                                        A

         Where:   X = the  number of shares of Common  Stock to be issued to the
                  Holder;

                  Y = the  number  of shares of  Common  Stock to  otherwise  be
                  purchased under this Warrant;

                  A = the Fair  Market  Value of one share of the Common  Stock;
                  and

                  B = the Exercise Price of the Warrant (as adjusted to the date
                  of the calculation).

                  Upon  exercise  of the  Conversion  Right  with  respect  to a
particular  number of Shares,  the Company shall deliver to the Holder,  without
payment by the Holder of any exercise price or any cash or other  consideration,
that number of Shares equal to the number  computed using the above formula.  No
fractional  shares shall be issuable upon exercise of the Conversion  Right, and
the number of shares to be issued in accordance  with the  foregoing  formula is
other than a whole  number,  the Company  shall round down to the nearest  whole
number the total  number of shares to be issued.  For  purposes of this  Section
3(a),  the term "Fair  Market  Value" shall mean the average last sale price per
share of Common Stock during the five (5) trading days immediately preceding the
effective date of conversion. If the Common Stock is not publicly traded at such
time, Fair Market Value shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.






                                        2





                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.

                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid one-half by the Company and one-half by the Holder.

                  (b) Upon  exercise of this Warrant as  aforesaid,  the Company
         shall as promptly as practicable,  and in any event within fifteen (15)
         days  thereafter,  execute and deliver to the Holder of this  Warrant a
         certificate  or  certificates  for the total number of whole Shares for
         which this Warrant is being  exercised in such names and  denominations
         as are  requested  by such Holder.  If this Warrant  shall be exercised
         with  respect  to less  than all of the  Shares,  the  Holder  shall be
         entitled  to  receive a new  Warrant  covering  the number of Shares in
         respect of which this Warrant shall not have been exercised,  which new
         Warrant shall in all other  respects be identical to this Warrant.  The
         Company  covenants  and  agrees  that it will  pay when due any and all
         state and  federal  issue  taxes which may be payable in respect of the
         issuance of this Warrant or the issuance of any Shares upon exercise of
         this Warrant.

         4.       COVENANTS AND CONDITIONS.  The above provisions are subject to
         the following:

                  (a) Neither this  Warrant nor the Shares have been  registered
         under the Securities Act of 1933, as amended  ("Securities Act") or any
         state securities laws ("Blue Sky Laws"). This Warrant has been acquired
         for investment  purposes and not with a view to  distribution or resale
         and may not be pledged, hypothecated,  sold, made subject to a security
         interest,   or   otherwise   transferred   without  (i)  an   effective
         registration  statement for such Warrant under the  Securities  Act and
         such  applicable  Blue Sky Laws,  or (ii) an opinion of counsel,  which
         opinion and counsel shall be reasonably satisfactory to the Company and
         its counsel, that registration is not required under the Securities Act
         or under any applicable Blue Sky Laws (the Company hereby  acknowledges
         that Bass, Berry & Sims is acceptable counsel).  Transfer of the shares
         issued upon the exercise of this  Warrant  shall be  restricted  in the
         same manner and to the same extent as the Warrant and the  certificates
         representing such Shares shall bear substantially the following legend:






                                        3





                  THE SHARES OF COMMON  STOCK  REPRESENTED  BY THIS  CERTIFICATE
                  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
                  AMENDED (THE "ACT"),  OR ANY APPLICABLE  STATE  SECURITIES LAW
                  AND MAY NOT BE TRANSFERRED UNTIL (I) A REGISTRATION  STATEMENT
                  UNDER THE ACT OR SUCH APPLICABLE  STATE  SECURITIES LAWS SHALL
                  HAVE  BECOME  EFFECTIVE  WITH REGARD  THERETO,  OR (II) IN THE
                  OPINION OF COUNSEL  ACCEPTABLE  TO THE  COMPANY,  REGISTRATION
                  UNDER SUCH SECURITIES ACTS OR SUCH APPLICABLE STATE SECURITIES
                  LAWS  IS  NOT  REQUIRED  IN  CONNECTION   WITH  SUCH  PROPOSED
                  TRANSFER.

The Holder  hereof and the Company  agree to execute  such other  documents  and
instruments as counsel for the Company  reasonably deems necessary to effect the
compliance of the issuance of this Warrant and any shares of Common Stock issued
upon exercise hereof with applicable federal and state securities laws.

                  (b) The Company covenants and agrees that all Shares which may
         be issued upon exercise of this Warrant will, upon issuance and payment
         therefor, be legally and validly issued and outstanding, fully paid and
         nonassessable,  free from all  taxes,  liens,  charges  and  preemptive
         rights,  if any, with respect thereto or to the issuance  thereof.  The
         Company shall at all times reserve and keep available for issuance upon
         the  exercise of this Warrant  such number of  authorized  but unissued
         shares of Common Stock as will be  sufficient to permit the exercise in
         full of this Warrant.


         5.       TRANSFER OF WARRANT.  Subject to the  provisions  of Section 4
hereof,  this Warrant may be transferred,  in whole or in part, to any person or
business  entity,  by  presentation  of the Warrant to the Company  with written
instructions for such transfer. Upon such presentation for transfer, the Company
shall promptly  execute and deliver a new Warrant or Warrants in the form hereof
in the name of the assignee or assignees and in the  denominations  specified in
such  instructions.  The  Company  shall  pay  all  expenses  incurred  by it in
connection  with the  preparation,  issuance and delivery of Warrants under this
Section.

         6.       WARRANT HOLDER NOT SHAREHOLDER;  RIGHTS  OFFERING;  PREEMPTIVE
RIGHTS;  PREFERENCE RIGHTS.  Except as otherwise  provided herein,  this Warrant
does not confer upon the Holder,  as such, any right whatsoever as a shareholder
of the Company.  Notwithstanding  the foregoing,  if the Company should offer to
all of the Company's  shareholders  the right to purchase any  securities of the
Company,  then all shares of Common Stock that are subject to this Warrant shall
be deemed to be  outstanding  and owned by the Holder  and the  Holder  shall be
entitled to participate in such rights offering. The Company shall not grant any
preemptive  rights with  respect to any of its capital  stock  without the prior
written consent of the Holder.  The Company shall not issue any securities which
entitle the holder thereof to




                                        4





obtain  any  preference  over  holders  of Common  Stock  upon the  dissolution,
liquidation,  winding-up, sale, merger, or reorganization of the Company without
the prior written consent of the Holder.

         7.       OBSERVATION   RIGHTS.   So  long  as  this   Warrant   remains
outstanding  and  notwithstanding  the repayment of the Note, the Holder of this
Warrant  shall (a)  receive  notice of and be  entitled  to attend or may send a
representative  to attend all meetings of the Company's  Board of Directors in a
non-voting observation capacity, (b) receive copies of all notices, packages and
documents provided to members of the Company's Board of Directors for each board
of directors  meeting,  and (c) receive  copies of all actions  taken by written
consent by the  Company's  Board of  Directors,  from the date hereof until such
time as the  indebtedness  evidenced  by the  Note has  been  paid in full.  The
Company  agrees to hold  meetings of its Board of  Directors  (which may include
telephonic meetings) at least quarterly.  All out-of-pocket expenses incurred by
Holder in attending any such meetings shall be reimbursed by Company.

         8.       ADJUSTMENT UPON CHANGES IN STOCK.

                  (a) If all or any portion of this  Warrant  shall be exercised
         subsequent  to  any  stock  split,  stock  dividend,  recapitalization,
         combination of shares of the Company, or other similar event, occurring
         after the date hereof,  then the Holder  exercising  this Warrant shall
         receive, for the aggregate price paid upon such exercise, the aggregate
         number and class of shares  which such  Holder  would have  received if
         this Warrant had been exercised  immediately prior to such stock split,
         stock  dividend,  recapitalization,  combination  of  shares,  or other
         similar event. If any adjustment under this Section 8(a) would create a
         fractional  share of Common  Stock or a right to  acquire a  fractional
         share of Common Stock,  such fractional  share shall be disregarded and
         the number of shares  subject to this Warrant  shall be the next higher
         number of shares,  rounding all fractions upward.  Whenever there shall
         be an  adjustment  pursuant to this  Section  8(a),  the Company  shall
         forthwith  notify  the  Holder  or  Holders  of  this  Warrant  of such
         adjustment,  setting forth in reasonable detail the event requiring the
         adjustment and the method by which such adjustment was calculated.

                  (b) If all or any portion of this  Warrant  shall be exercised
         subsequent   to  any   merger,   consolidation,   exchange  of  shares,
         separation,  reorganization  or  liquidation  of the Company,  or other
         similar event,  occurring  after the date hereof,  as a result of which
         shares of Common  Stock  shall be changed  into the same or a different
         number of shares of the same or another  class or classes of securities
         of the  Company or another  entity,  then the  Holder  exercising  this
         Warrant shall receive, for the aggregate price paid upon such exercise,
         the  aggregate  number and class of shares which such Holder would have
         received if this Warrant had been exercised  immediately  prior to such
         merger, consolidation,  exchange of shares, separation,  reorganization
         or liquidation,  or other similar event.  If any adjustment  under this
         Section 8(b) would create a fractional share of Common Stock or a right
         to acquire a fractional  share of Common Stock,  such fractional  share
         shall be disregarded and the number of shares




                                        5





         subject  to this  Warrant  shall be the next  higher  number of shares,
         rounding all fractions  upward.  Whenever  there shall be an adjustment
         pursuant to this Section 8(b), the Company shall  forthwith  notify the
         Holder or Holders of this Warrant of such adjustment,  setting forth in
         reasonable  detail the event requiring the adjustment and the method by
         which such adjustment was calculated.

         9.       PUT AGREEMENT.

                  (a) The Company hereby irrevocably grants and issues to Holder
         the right and option to sell to the Company  (the  "Put") this  Warrant
         until the Expiration  Date at a purchase  price (the "Purchase  Price")
         equal to the Fair Market Value (as  hereinafter  defined) of the shares
         of Common Stock issuable to Holder upon exercise of this Warrant.

                  (b) The Company shall pay to the Holder the Purchase Price, in
         cash or certified or cashier's  check,  in exchange for the delivery to
         the Company of this Warrant within  forty-five (45) days of the receipt
         of written notice, addressed as set forth in Section 3 hereto, from the
         Holder of its  intention  to exercise  the Put and stating the Purchase
         Price determined in accordance with this Section 9.

                  (c) The Fair Market Value of the shares of Common Stock of the
         Company  issuable  pursuant to this  Warrant  shall be the average last
         sales price per share of Common  Stock during the five (5) trading days
         preceding  the date of purchase or if the Common  Stock is not publicly
         traded at such time shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.





                                       6





                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid one-half by the Holder and one-half by the Company.

         10.      REGISTRATION.

                  (a) The Company and the holders of the Shares agree that if at
         any time after the date  hereof  the  Company  shall  propose to file a
         registration  statement with respect to the  underwritten  issuance and
         sale by the Company of any of its Common Stock on a form suitable for a
         secondary  offering,  it will give  notice in writing to such effect to
         the registered holder(s) of the Shares at least fifteen (15) days prior
         to such  filing,  and,  at the written  request of any such  registered
         holder,  made within  five (5) days after the  receipt of such  notice,
         will include  therein at the Company's cost and expense  (including the
         fees  and  expenses  of  counsel  to  such  holder(s),   but  excluding
         underwriting discounts, commissions and filing fees attributable to the
         Shares  included  therein) such of the Shares as such  holder(s)  shall
         request;  provided,  however,  that if the offering being registered by
         the  Company  is  underwritten  and  if  the   representative   of  the
         underwriters  certifies  in writing that the  inclusion  therein of the
         Shares would materially and adversely affect the sale of the securities
         to be sold  by the  Company  thereunder,  then  the  Company  shall  be
         required to include in the  offering  only that  number of  securities,
         including the Shares,  which the  underwriters  determine in their sole
         discretion  will  not  jeopardize  the  success  of the  offering  (the
         securities  so  included to be  apportioned  pro rata among all selling
         shareholders according to the total amount of securities entitled to be
         included  therein  owned by each selling  shareholder,  but in no event
         shall the total number of Shares  included in the offering be less than
         the number of  securities  included in the offering by any other single
         selling shareholder).

                  (b)      Whenever  the  Company   undertakes   to  effect  the
         registration of any of the Shares,  the Company shall, as expeditiously
         as reasonably possible:

                           (i) Prepare and file with the Securities and Exchange
                  Commission  (the   "Commission")   a  registration   statement
                  covering  such  Shares and use its best  efforts to cause such
                  registration   statement  to  be  declared  effective  by  the
                  Commission  as  expeditiously  as  possible  and to keep  such
                  registration  effective until the earlier of (A) the date when
                  all Shares  covered by the  registration  statement  have been
                  sold or (B) two hundred  seventy (270) days from the effective
                  date of the  registration  statement;  provided,  that  before
                  filing a registration statement or prospectus or any amendment
                  or  supplements  thereto,  the  Company  will  furnish to each
                  Holder of Shares  covered by such  registration  statement and
                  the  underwriters,  if  any,  copies  of  all  such  documents
                  proposed  to be filed  (excluding  exhibits,  unless  any such
                  person shall specifically  request exhibits),  which documents
                  will be subject to the review of such Holders and




                                        7





                  underwriters,  and the Company will not file such registration
                  statement or any  amendment  thereto or any  prospectus or any
                  supplement  thereto  (including any documents  incorporated by
                  reference   therein)   with   the   Commission   if  (A)   the
                  underwriters,  if any, shall reasonably  object to such filing
                  or  (B) if  information  in  such  registration  statement  or
                  prospectus  concerning a particular selling Holder has changed
                  and such Holder or the underwriters,  if any, shall reasonably
                  object.

                           (ii)  Prepare  and  file  with  the  Commission  such
                  amendments and post-effective  amendments to such registration
                  statement  as may  be  necessary  to  keep  such  registration
                  statement  effective  during the period referred to in Section
                  10(b)(i) and to comply with the  provisions of the  Securities
                  Act with respect to the disposition of all securities  covered
                  by such registration statement, and cause the prospectus to be
                  supplemented by any required prospectus supplement,  and as so
                  supplemented to be filed with the Commission  pursuant to Rule
                  424 under the Securities Act.

                           (iii) Furnish to the selling  Holder(s)  such numbers
                  of  copies  of such  registration  statement,  each  amendment
                  thereto,   the  prospectus   included  in  such   registration
                  statement  (including  each  preliminary   prospectus),   each
                  supplement  thereto  and  such  other  documents  as they  may
                  reasonably  request in order to facilitate the  disposition of
                  the Shares owned by them.

                           (iv) Use its best  efforts to  register  and  qualify
                  under  such other  securities  laws of such  jurisdictions  as
                  shall be reasonably requested by any selling Holder and do any
                  and  all  other  acts  and  things  which  may  be  reasonably
                  necessary  or  advisable  to  enable  such  selling  Holder to
                  consummate the disposition of the Shares owned by such Holder,
                  in such  jurisdictions;  provided,  however,  that the Company
                  shall  not  be  required  in  connection  therewith  or  as  a
                  condition thereto to qualify to transact business or to file a
                  general  consent to  service of process in any such  states or
                  jurisdictions.

                           (v)  Promptly  notify  each  selling  Holder  of  the
                  happening  of any event as a result  of which  the  prospectus
                  included  in such  registration  statement  contains an untrue
                  statement  of a material  fact or omits any fact  necessary to
                  make the statements therein not misleading and, at the request
                  of any such Holder,  the Company will prepare a supplement  or
                  amendment to such prospectus so that, as thereafter  delivered
                  to the  purchasers of such Shares,  such  prospectus  will not
                  contain  an untrue  statement  of a  material  fact or omit to
                  state any fact  necessary to make the  statements  therein not
                  misleading  and the  Holder(s)  shall  suspend  trading at the
                  request  of the  Company  if,  upon  advice of  counsel to the
                  Company, such suspension is advisable.

                           (vi) Provide a transfer  agent and  registrar for all
                  such  Shares  not  later  than  the  effective  date  of  such
                  registration statement.




                                        8






                           (vii) Enter into such customary agreements (including
                  underwriting  agreements  in  customary  form  for  a  primary
                  offering) and take all such other actions as the underwriters,
                  if any,  reasonably request in order to expedite or facilitate
                  the disposition of such Shares (including, without limitation,
                  effecting a stock split or a combination of shares).

                           (viii) Make  available for  inspection by any selling
                  Holder or any  underwriter  participating  in any  disposition
                  pursuant  to such  registration  statement  and any  attorney,
                  accountant or other agent  retained by any such selling Holder
                  or  underwriter,  all financial and other  records,  pertinent
                  corporate  documents and properties of the Company,  and cause
                  the officers, directors, employees and independent accountants
                  of the Company to supply all information  reasonably requested
                  by any such seller, underwriter, attorney, accountant or agent
                  in connection with such registration statement.

                           (ix)  Promptly  notify the selling  Holder(s) and the
                  underwriters,   if  any,  of  the  following  events  and  (if
                  requested by any such person)  confirm  such  notification  in
                  writing:  (A) the filing of the  prospectus or any  prospectus
                  supplement and the registration statement and any amendment or
                  post-effective  amendment  thereto  and,  with  respect to the
                  registration   statement  or  any   post-effective   amendment
                  thereto,   the  declaration  of  the   effectiveness  of  such
                  documents,  (B) any requests by the  Commission for amendments
                  or supplements to the registration statement or the prospectus
                  or for additional  information,  (C) the issuance or threat of
                  issuance by the  Commission of any stop order  suspending  the
                  effectiveness of the registration  statement or the initiation
                  of any  proceedings  for that purpose,  and (D) the receipt by
                  the Company of any notification with respect to the suspension
                  of  the   qualification   of  the   Shares  for  sale  in  any
                  jurisdiction  or the initiation or threat of initiation of any
                  proceeding  for such purposes and the Holder(s)  shall suspend
                  trading  at the  request of the  Company  if,  upon  advice of
                  counsel to the Company, such suspension is advisable.

                           (x) Make every reasonable effort to prevent the entry
                  of any order suspending the  effectiveness of the registration
                  statement  and  obtain at the  earliest  possible  moment  the
                  withdrawal of any such order, if entered.

                           (xi)  Cooperate  with the selling  Holder(s)  and the
                  underwriters, if any, to facilitate the timely preparation and
                  delivery of  certificates  representing  the Shares to be sold
                  and not  bearing  any  restrictive  legends,  and enable  such
                  Shares to be in such lots and  registered in such names as the
                  underwriters  may request at least two (2) business days prior
                  to any delivery of the Shares to the underwriters.

                           (xii)  Provide a CUSIP  number for all the Shares not
                  later than the effective date of the registration statement.




                                        9






                           (xiii) [INTENTIONALLY OMITTED]

                           (xiv)  Otherwise  use its best efforts to comply with
                  all applicable  rules and regulations of the  Commission,  and
                  make  generally  available  to its security  holders  earnings
                  statements  satisfying  the provisions of Section 11(a) of the
                  Securities  Act, no later than  forty-five (45) days after the
                  end of any  twelve-month  period (or ninety (90) days, if such
                  period  is a fiscal  year)  (A)  commencing  at the end of any
                  fiscal quarter in which the Shares are sold to underwriters in
                  a firm or best efforts  underwritten  offering,  or (B) if not
                  sold to underwriters  in such an offering,  beginning with the
                  first  month  of the  first  fiscal  quarter  of  the  Company
                  commencing  after  the  effective  date  of  the  registration
                  statement,  which  statements  shall  cover such  twelve-month
                  periods.

                  (c) After the date hereof,  the Company shall not grant to any
         holder of  securities  of the  Company  any  registration  rights  with
         respect to an underwritten  offering which have a priority greater than
         or equal to those granted to Holders  pursuant to this Warrant  without
         the prior written consent of the Holder(s).

                  (d) The Company's  obligations  under Section 10(a) above with
         respect to each holder of Shares are  expressly  conditioned  upon such
         holder's   furnishing  to  the  Company  in  writing  such  information
         concerning such holder and the terms of such holder's proposed offering
         as  the  Company  shall   reasonably   request  for  inclusion  in  the
         registration  statement. If any registration statement including any of
         the Shares is filed,  then the  Company  shall  indemnify  each  holder
         thereof (and each underwriter for such holder and each person,  if any,
         who controls such underwriter within the meaning of the Securities Act)
         from any loss, claim, damage or liability arising out of, based upon or
         in any  way  relating  to  any  untrue  statement  of a  material  fact
         contained  in such  registration  statement  or any  omission  to state
         therein a material fact  required to be stated  therein or necessary to
         make  the  statements  therein  not  misleading,  except  for any  such
         statement or omission based on information furnished in writing by such
         holder  of the  Shares  expressly  for  use  in  connection  with  such
         registration  statement;  and such holder shall  indemnify  the Company
         (and  each  of  its  officers  and   directors   who  has  signed  such
         registration  statement,  each  director,  each  person,  if  any,  who
         controls the Company  within the meaning of the  Securities  Act,  each
         underwriter for the Company and each person,  if any, who controls such
         underwriter  within the meaning of the  Securities  Act) and each other
         such holder against any loss,  claim,  damage or liability arising from
         any  such  statement  or  omission  which  was  made in  reliance  upon
         information  furnished  in writing to the Company by such holder of the
         Shares   expressly  for  use  in  connection  with  such   registration
         statement.

                  (e)  For purposes of this Section 10, all of the Shares shall 
         be deemed to be issued and outstanding.

                  (f) The rights contained in this Section 10 shall expire as to
         any holder of Shares that is able to sell  Shares  pursuant to Rule 144
         of the Securities Act.




                                       10






         11.      CERTAIN NOTICES. In case at any time the Company shall propose
                  to:

                  (a)      declare any cash dividend upon its Common Stock;

                  (b)      declare any dividend upon its Common Stock payable in
         stock or make any special dividend or other distribution to the holders
         of its Common Stock;

                  (c)      offer for  subscription  to the holders of any of its
         Common  Stock  any  additional  shares  of stock in any  class or other
         rights;

                  (d)      reorganize,  or  reclassify  the capital stock of the
         Company,  or consolidate,  merge or otherwise combine with, or sell all
         or substantially all of its assets to, another corporation; or

                  (e)      voluntarily or involuntarily  dissolve,  liquidate or
         wind up the affairs of the Company;

         then,  in any one or more of said cases,  the Company shall give to the
         Holder of the Warrant,  by certified or registered  mail,  (i) at least
         twenty (20) days' prior  written  notice of the date on which the books
         of the  Company  shall  close  or a  record  shall  be  taken  for such
         dividend, distribution or subscription rights or for determining rights
         to  vote  in  respect  of any  such  reorganization,  reclassification,
         consolidation,  merger, sale,  dissolution,  liquidation or winding up,
         and  (ii)  in  the  case  of  such  reorganization,   reclassification,
         consolidation, merger, sale, dissolution, liquidation or winding up, at
         least twenty (20) days' prior written  notice of the date when the same
         shall take place. Any notice required by clause (i) shall also specify,
         in the case of any such dividend,  distribution or subscription rights,
         the date on  which  the  holders  of  Common  Stock  shall be  entitled
         thereto,  and any notice required by clause (ii) shall specify the date
         on which the  holders of Common  Stock  shall be  entitled  to exchange
         their Common Stock for  securities or other property  deliverable  upon
         such  reorganization,  reclassification,  consolidation,  merger, sale,
         dissolution, liquidation or winding up, as the case may be.

         12.      EQUITY  PARTICIPATION.  This  Warrant is issued in  connection
         with the Loan Agreement. It is intended that this Warrant constitute an
         equity participation under and pursuant to T.C.A. ss.47-24-101, et seq.
         and that such equity participation be permitted under said statutes and
         not  constitute  interest  on the  Note.  If  under  any  circumstances
         whatsoever,  fulfillment  of any  obligation of this Warrant,  the Loan
         Agreement,  or any other  agreement or document  executed in connection
         with  the  Loan  Agreement,  shall  violate  the  lawful  limit  of any
         applicable  usury  statute or any other  applicable  law with regard to
         obligations  of like  character and amount,  then the  obligation to be
         fulfilled shall be reduced to such lawful limit,  such that in no event
         shall there occur, under this Warrant, the Loan Agreement, or any other
         document or instrument  executed in connection with the Loan Agreement,
         any  violation  of such  lawful  limit,  but such  obligation  shall be
         fulfilled to the lawful limit. If any sum is




                                       11





         collected in excess of the lawful  limit,  such excess shall be applied
         to reduce the principal amount of the Note.

         13.      GOVERNING  LAW.  This warrant shall be governed by the laws of
         the State of Tennessee  applicable to agreements  made entirely  within
         the State.

         14.      SEVERABILITY.  If any  provision(s)  of  this  Warrant  or the
         application  thereof to any person or circumstances shall be invalid or
         unenforceable  to any extent,  the  remainder  of this  Warrant and the
         application of such provisions to other persons or circumstances  shall
         not be affected  thereby and shall be enforced to the  greatest  extent
         permitted by law.

         15.      COUNTERPARTS.  This  Warrant  may be executed in any number of
         counterparts  and be  different  parties to this  Warrant  in  separate
         counterparts,  each of which when so executed  shall be deemed to be an
         original and all of which taken together  shall  constitute one and the
         same Warrant.

         16.      JURISDICTION  AND VENUE.  The Company  hereby  consents to the
         jurisdiction  of the  courts of the State of  Tennessee  and the United
         States District Court for the Middle District of Tennessee,  as well as
         to the  jurisdiction  of all  courts  from which an appeal may be taken
         from  such  courts,  for the  purpose  of any  suit,  action  or  other
         proceeding  arising out of any of its  obligations  arising  under this
         Agreement or with respect to the transactions  contemplated hereby, and
         expressly  waives any and all objections it may have as to venue in any
         such courts.






                                       12




         IN WITNESS  WHEREOF,  the parties hereto have set their hands as of the
date first above written.

                                           SUPERIOR PHARMACEUTICAL COMPANY,
                                           an Ohio corporation


                                           By:    Dhananjay G. Wadekar
                                              --------------------------------

                                           Title:  Director
                                                 -----------------------------



                                           SIRROM CAPITAL CORPORATION, a
                                           Tennessee corporation



                                           By:    ILLEGIBLE
                                              --------------------------------

                                           Title:  Vice President
                                                 -----------------------------


                                       13




                                                                    EXHIBIT 4.21
                             STOCK PURCHASE WARRANT

         This  Warrant  is  issued  this  18th day of June,  1997,  by  SUPERIOR
PHARMACEUTICAL  COMPANY,  an  Ohio  corporation  (the  "Company"),   to  ODYSSEY
INVESTMENT   PARTNERS,   L.P.,  a  Pennsylvania   limited  partnership  (ODYSSEY
INVESTMENT  PARTNERS,  L.P. and any subsequent assignee or transferee hereof are
hereinafter referred to collectively as "Holder" or "Holders").


                                   AGREEMENT:

         1.       ISSUANCE OF WARRANT; TERM. For and in consideration of ODYSSEY
INVESTMENT PARTNERS, L.P. making a loan to DynaGen, Inc., a Delaware corporation
and sole  shareholder  of the Company in an amount of One Million and  no/100ths
Dollars  ($1,000,000.00)  pursuant to the terms of a secured  promissory note of
even date herewith (the "Note") and related loan agreement of even date herewith
(the "Loan Agreement"),  and other good and valuable consideration,  the receipt
and sufficiency of which are hereby  acknowledged,  the Company hereby grants to
Holder the right to purchase  shares of the Company's  common stock (the "Common
Stock"),  which  equals 5% of the capital  stock of the  Company.  The shares of
Common Stock issuable upon exercise of this Warrant are hereinafter  referred to
as the "Shares."  This Warrant shall be exercisable at any time and from time to
time  after  such  time as that  certain  Stock  Purchase  Warrant  of even date
herewith issued by DynaGen,  Inc. in favor of Holder(s)  ("Parent  Warrant") has
been  terminated and this Warrant has been  substituted  for the Parent Warrant,
but not later than August 31, 2002 (the  "Expiration  Date").  In exercising its
rights and obligations hereunder, the Company agrees to treat the Holder no less
favorably than it treats Sirrom Capital  Corporation  ("Sirrom") pursuant to the
Stock Purchase Warrant issued by the Company to Sirrom on the date hereof.

         2.       EXERCISE PRICE. The exercise price (the "Exercise  Price") per
share for this Warrant shall be One Cent ($.01).

         3.       EXERCISE.

                  (a) This Warrant may be  exercised  by the Holder  hereof (but
         only  on  the  conditions  hereinafter  set  forth)  as to  all  or any
         increment or  increments of One Hundred (100) Shares (or the balance of
         the Shares if less than such number),  upon delivery of written  notice
         of intent to exercise to the Company at the following address:  99 Erie
         Street,  Cambridge,  Massachusetts  02139 or such other  address as the
         Company  shall  designate  in a written  notice to the  Holder  hereof,
         together  with this Warrant and payment to the Company of the aggregate
         Exercise Price of the Shares so purchased.  The Exercise Price shall be
         payable, at the option of the Holder, (i) by certified or bank check or
         (ii)  by the  surrender  of the  Note  or  portion  thereof  having  an
         outstanding principal balance equal to the aggregate Exercise Price. In
         addition to and  without  limiting  the rights of the Holder  under the
         terms of this Warrant, the Holder









         shall have the right (the  "Conversion  Right") to convert this Warrant
         or any portion  thereof into shares of Common Stock as provided in this
         Section  at any time or from time to time prior to its  expiration.  In
         lieu of  exercising  this  Warrant  for cash,  the  Holder may elect to
         surrender  a portion  of this  Warrant  for  conversion  and to receive
         shares  of Common  Stock  equal to the  value of this  Warrant  (or the
         portion being  cancelled,  surrendered  and  converted) by surrender of
         this Warrant to the Company together with notice of such election. Upon
         such event, the Company shall issue to the Holder a number of shares of
         the Company's Common Stock computed by using the following formula:

                                  X = Y (A - B)
                                     ----------
                                          A

         Where:   X = the  number of shares of Common  Stock to be issued to the
                  Holder;

                  Y = the  number  of shares of  Common  Stock to  otherwise  be
                  purchased under this Warrant;

                  A = the Fair  Market  Value of one share of the Common  Stock;
                  and

                  B = the Exercise Price of the Warrant (as adjusted to the date
                  of the calculation).

                  Upon  exercise  of the  Conversion  Right  with  respect  to a
particular  number of Shares,  the Company shall deliver to the Holder,  without
payment by the Holder of any exercise price or any cash or other  consideration,
that number of Shares equal to the number  computed using the above formula.  No
fractional  shares shall be issuable upon exercise of the Conversion  Right, and
the number of shares to be issued in accordance  with the  foregoing  formula is
other than a whole  number,  the Company  shall round down to the nearest  whole
number the total  number of shares to be issued.  For  purposes of this  Section
3(a),  the term "Fair  Market  Value" shall mean the average last sale price per
share of Common Stock during the five (5) trading days immediately preceding the
effective date of conversion. If the Common Stock is not publicly traded at such
time, Fair Market Value shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.



                                        2






                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.

                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid by the Company.

                  (b) Upon  exercise of this Warrant as  aforesaid,  the Company
         shall as promptly as practicable,  and in any event within fifteen (15)
         days  thereafter,  execute and deliver to the Holder of this  Warrant a
         certificate  or  certificates  for the total number of whole Shares for
         which this Warrant is being  exercised in such names and  denominations
         as are  requested  by such Holder.  If this Warrant  shall be exercised
         with  respect  to less  than all of the  Shares,  the  Holder  shall be
         entitled  to  receive a new  Warrant  covering  the number of Shares in
         respect of which this Warrant shall not have been exercised,  which new
         Warrant shall in all other  respects be identical to this Warrant.  The
         Company  covenants  and  agrees  that it will  pay when due any and all
         state and  federal  issue  taxes which may be payable in respect of the
         issuance of this Warrant or the issuance of any Shares upon exercise of
         this Warrant.

         4.       COVENANTS AND CONDITIONS.  The above provisions are subject to
                  the following:

                  (a) Neither this  Warrant nor the Shares have been  registered
         under the Securities Act of 1933, as amended  ("Securities Act") or any
         state securities laws ("Blue Sky Laws"). This Warrant has been acquired
         for investment  purposes and not with a view to  distribution or resale
         and may not be pledged, hypothecated,  sold, made subject to a security
         interest,   or   otherwise   transferred   without  (i)  an   effective
         registration  statement for such Warrant under the  Securities  Act and
         such  applicable  Blue Sky Laws,  or (ii) an opinion of counsel,  which
         opinion and counsel shall be reasonably satisfactory to the Company and
         its counsel, that registration is not required under the Securities Act
         or under any applicable Blue Sky Laws (the Company hereby  acknowledges
         that Bass, Berry & Sims is acceptable counsel).  Transfer of the shares
         issued upon the exercise of this  Warrant  shall be  restricted  in the
         same manner and to the same extent as the Warrant and the  certificates
         representing such Shares shall bear substantially the following legend:






                                        3





                  THE SHARES OF COMMON  STOCK  REPRESENTED  BY THIS  CERTIFICATE
                  HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS
                  AMENDED (THE "ACT"),  OR ANY APPLICABLE  STATE  SECURITIES LAW
                  AND MAY NOT BE TRANSFERRED UNTIL (I) A REGISTRATION  STATEMENT
                  UNDER THE ACT OR SUCH APPLICABLE  STATE  SECURITIES LAWS SHALL
                  HAVE  BECOME  EFFECTIVE  WITH REGARD  THERETO,  OR (II) IN THE
                  OPINION OF COUNSEL  ACCEPTABLE  TO THE  COMPANY,  REGISTRATION
                  UNDER SUCH SECURITIES ACTS OR SUCH APPLICABLE STATE SECURITIES
                  LAWS  IS  NOT  REQUIRED  IN  CONNECTION   WITH  SUCH  PROPOSED
                  TRANSFER.

The Holder  hereof and the Company  agree to execute  such other  documents  and
instruments as counsel for the Company  reasonably deems necessary to effect the
compliance of the issuance of this Warrant and any shares of Common Stock issued
upon exercise hereof with applicable federal and state securities laws.

                  (b) The Company covenants and agrees that all Shares which may
         be issued upon exercise of this Warrant will, upon issuance and payment
         therefor, be legally and validly issued and outstanding, fully paid and
         nonassessable,  free from all  taxes,  liens,  charges  and  preemptive
         rights,  if any, with respect thereto or to the issuance  thereof.  The
         Company shall at all times reserve and keep available for issuance upon
         the  exercise of this Warrant  such number of  authorized  but unissued
         shares of Common Stock as will be  sufficient to permit the exercise in
         full of this Warrant.


         5.       TRANSFER OF WARRANT.  Subject to the  provisions  of Section 4
hereof,  this Warrant may be transferred,  in whole or in part, to any person or
business  entity,  by  presentation  of the Warrant to the Company  with written
instructions for such transfer. Upon such presentation for transfer, the Company
shall promptly  execute and deliver a new Warrant or Warrants in the form hereof
in the name of the assignee or assignees and in the  denominations  specified in
such  instructions.  The  Company  shall  pay  all  expenses  incurred  by it in
connection  with the  preparation,  issuance and delivery of Warrants under this
Section.

         6.       WARRANT HOLDER NOT SHAREHOLDER;  RIGHTS  OFFERING;  PREEMPTIVE
RIGHTS;  PREFERENCE RIGHTS.  Except as otherwise  provided herein,  this Warrant
does not confer upon the Holder,  as such, any right whatsoever as a shareholder
of the Company.  Notwithstanding  the foregoing,  if the Company should offer to
all of the Company's  shareholders  the right to purchase any  securities of the
Company,  then all shares of Common Stock that are subject to this Warrant shall
be deemed to be  outstanding  and owned by the Holder  and the  Holder  shall be
entitled to participate in such rights offering. The Company shall not grant any
preemptive  rights with  respect to any of its capital  stock  without the prior
written consent of the Holder.  The Company shall not issue any securities which
entitle the holder thereof to




                                        4





obtain  any  preference  over  holders  of Common  Stock  upon the  dissolution,
liquidation,  winding-up, sale, merger, or reorganization of the Company without
the prior written consent of the Holder.

         7.       OBSERVATION   RIGHTS.   So  long  as  this   Warrant   remains
outstanding  and  notwithstanding  the repayment of the Note, the Holder of this
Warrant  shall (a)  receive  notice of and be  entitled  to attend or may send a
representative  to attend all meetings of the Company's  Board of Directors in a
non-voting observation capacity, (b) receive copies of all notices, packages and
documents provided to members of the Company's Board of Directors for each board
of directors  meeting,  and (c) receive  copies of all actions  taken by written
consent by the  Company's  Board of  Directors,  from the date hereof until such
time as the  indebtedness  evidenced  by the  Note has  been  paid in full.  The
Company  agrees to hold  meetings of its Board of  Directors  (which may include
telephonic meetings) at least quarterly.  All out-of-pocket expenses incurred by
Holder in attending any such meetings shall be reimbursed by Company.

         8.       ADJUSTMENT UPON CHANGES IN STOCK.

                  (a) If all or any portion of this  Warrant  shall be exercised
         subsequent  to  any  stock  split,  stock  dividend,  recapitalization,
         combination of shares of the Company, or other similar event, occurring
         after the date hereof,  then the Holder  exercising  this Warrant shall
         receive, for the aggregate price paid upon such exercise, the aggregate
         number and class of shares  which such  Holder  would have  received if
         this Warrant had been exercised  immediately prior to such stock split,
         stock  dividend,  recapitalization,  combination  of  shares,  or other
         similar event. If any adjustment under this Section 8(a) would create a
         fractional  share of Common  Stock or a right to  acquire a  fractional
         share of Common Stock,  such fractional  share shall be disregarded and
         the number of shares  subject to this Warrant  shall be the next higher
         number of shares,  rounding all fractions upward.  Whenever there shall
         be an  adjustment  pursuant to this  Section  8(a),  the Company  shall
         forthwith  notify  the  Holder  or  Holders  of  this  Warrant  of such
         adjustment,  setting forth in reasonable detail the event requiring the
         adjustment and the method by which such adjustment was calculated.

                  (b) If all or any portion of this  Warrant  shall be exercised
         subsequent   to  any   merger,   consolidation,   exchange  of  shares,
         separation,  reorganization  or  liquidation  of the Company,  or other
         similar event,  occurring  after the date hereof,  as a result of which
         shares of Common  Stock  shall be changed  into the same or a different
         number of shares of the same or another  class or classes of securities
         of the  Company or another  entity,  then the  Holder  exercising  this
         Warrant shall receive, for the aggregate price paid upon such exercise,
         the  aggregate  number and class of shares which such Holder would have
         received if this Warrant had been exercised  immediately  prior to such
         merger, consolidation,  exchange of shares, separation,  reorganization
         or liquidation,  or other similar event.  If any adjustment  under this
         Section 8(b) would create a fractional share of Common Stock or a right
         to acquire a fractional  share of Common Stock,  such fractional  share
         shall be disregarded and the number of shares




                                        5





         subject  to this  Warrant  shall be the next  higher  number of shares,
         rounding all fractions  upward.  Whenever  there shall be an adjustment
         pursuant to this Section 8(b), the Company shall  forthwith  notify the
         Holder or Holders of this Warrant of such adjustment,  setting forth in
         reasonable  detail the event requiring the adjustment and the method by
         which such adjustment was calculated.

         9.       PUT AGREEMENT.

                  (a) The Company hereby irrevocably grants and issues to Holder
         the right and option to sell to the Company  (the  "Put") this  Warrant
         for a period  of  ninety  (90)  days  ending  immediately  prior to the
         Expiration Date at a purchase price (the "Purchase Price") equal to the
         Fair  Market  Value (as  hereinafter  defined)  of the shares of Common
         Stock issuable to Holder upon exercise of this Warrant.

                  (b) The Company shall pay to the Holder the Purchase Price, in
         cash or certified or cashier's  check,  in exchange for the delivery to
         the Company of this Warrant within  forty-five (45) days of the receipt
         of written notice, addressed as set forth in Section 3 hereto, from the
         Holder of its  intention  to exercise  the Put and stating the Purchase
         Price determined in accordance with Section 9.

                  (c) The Fair Market Value of the shares of Common Stock of the
         Company  issuable  pursuant to this  Warrant  shall be the average last
         sales price per share of Common  Stock during the five (5) trading days
         preceding  the date of purchase or if the Common  Stock is not publicly
         traded at such time shall be determined as follows:

                           (i) The Company and the Holder  shall each appoint an
                  independent,  experienced  appraiser  who  is  a  member  of a
                  recognized  professional  association of business  appraisers.
                  The two appraisers  shall determine the value of the shares of
                  Common  Stock which  would be issued upon the  exercise of the
                  Warrant,  taking into  consideration  that such  shares  would
                  constitute a minority interest, and would lack liquidity,  and
                  further  assuming  that the sale  would be  between  a willing
                  buyer and a willing  seller,  both of whom have full knowledge
                  of the financial and other affairs of the Company, and neither
                  of whom is under any compulsion to sell or to buy.

                           (ii) If the highest of the two appraisals is not more
                  than 10% more  than the  lowest  of the  appraisals,  the Fair
                  Market  Value shall be the average of the two  appraisals.  If
                  the  highest  of the two  appraisals  is 10% or more  than the
                  lowest of the two appraisals,  then a third appraiser shall be
                  appointed by the two appraisers, and if they cannot agree on a
                  third appraiser,  the American  Arbitration  Association shall
                  appoint the third appraiser.  The third appraiser,  regardless
                  of who appoints him or her, shall have the same qualifications
                  as the first two appraisers.





                                        6





                           (iii) The Fair Market Value after the  appointment of
                  the third appraiser shall be the mean of the three appraisals.

                           (iv) The fees and expenses of the appraisers shall be
                  paid by the Company.

         10.      REGISTRATION.

                  (a) The Company and the holders of the Shares agree that if at
         any time after the date  hereof  the  Company  shall  propose to file a
         registration  statement with respect to the  underwritten  issuance and
         sale by the Company of any of its Common Stock on a form suitable for a
         secondary  offering,  it will give  notice in writing to such effect to
         the registered holder(s) of the Shares at least fifteen (15) days prior
         to such  filing,  and,  at the written  request of any such  registered
         holder,  made within  five (5) days after the  receipt of such  notice,
         will include  therein at the Company's cost and expense  (including the
         fees  and  expenses  of  counsel  to  such  holder(s),   but  excluding
         underwriting discounts, commissions and filing fees attributable to the
         Shares  included  therein) such of the Shares as such  holder(s)  shall
         request;  provided,  however,  that if the offering being registered by
         the  Company  is  underwritten  and  if  the   representative   of  the
         underwriters  certifies  in writing that the  inclusion  therein of the
         Shares would materially and adversely affect the sale of the securities
         to be sold  by the  Company  thereunder,  then  the  Company  shall  be
         required to include in the  offering  only that  number of  securities,
         including the Shares,  which the  underwriters  determine in their sole
         discretion  will  not  jeopardize  the  success  of the  offering  (the
         securities  so  included to be  apportioned  pro rata among all selling
         shareholders according to the total amount of securities entitled to be
         included  therein  owned by each selling  shareholder,  but in no event
         shall the total number of Shares  included in the offering be less than
         the number of  securities  included in the offering by any other single
         selling shareholder).

                  (b) Whenever the Company undertakes to effect the registration
         of any of the Shares, the Company shall, as expeditiously as reasonably
         possible:

                           (i) Prepare and file with the Securities and Exchange
                  Commission  (the   "Commission")   a  registration   statement
                  covering  such  Shares and use its best  efforts to cause such
                  registration   statement  to  be  declared  effective  by  the
                  Commission  as  expeditiously  as  possible  and to keep  such
                  registration  effective until the earlier of (A) the date when
                  all Shares  covered by the  registration  statement  have been
                  sold or (B) two hundred  seventy (270) days from the effective
                  date of the  registration  statement;  provided,  that  before
                  filing a registration statement or prospectus or any amendment
                  or  supplements  thereto,  the  Company  will  furnish to each
                  Holder of Shares  covered by such  registration  statement and
                  the  underwriters,  if  any,  copies  of  all  such  documents
                  proposed  to be filed  (excluding  exhibits,  unless  any such
                  person shall specifically  request exhibits),  which documents
                  will be subject to the review of such Holders and




                                        7





                  underwriters,  and the Company will not file such registration
                  statement or any  amendment  thereto or any  prospectus or any
                  supplement  thereto  (including any documents  incorporated by
                  reference   therein)   with   the   Commission   if  (A)   the
                  underwriters,  if any, shall reasonably  object to such filing
                  or  (B) if  information  in  such  registration  statement  or
                  prospectus  concerning a particular selling Holder has changed
                  and such Holder or the underwriters,  if any, shall reasonably
                  object.

                           (ii)  Prepare  and  file  with  the  Commission  such
                  amendments and post-effective  amendments to such registration
                  statement  as may  be  necessary  to  keep  such  registration
                  statement  effective  during the period referred to in Section
                  10(b)(i) and to comply with the  provisions of the  Securities
                  Act with respect to the disposition of all securities  covered
                  by such registration statement, and cause the prospectus to be
                  supplemented by any required prospectus supplement,  and as so
                  supplemented to be filed with the Commission  pursuant to Rule
                  424 under the Securities Act.

                           (iii) Furnish to the selling  Holder(s)  such numbers
                  of  copies  of such  registration  statement,  each  amendment
                  thereto,   the  prospectus   included  in  such   registration
                  statement  (including  each  preliminary   prospectus),   each
                  supplement  thereto  and  such  other  documents  as they  may
                  reasonably  request in order to facilitate the  disposition of
                  the Shares owned by them.

                           (iv) Use its best  efforts to  register  and  qualify
                  under  such other  securities  laws of such  jurisdictions  as
                  shall be reasonably requested by any selling Holder and do any
                  and  all  other  acts  and  things  which  may  be  reasonably
                  necessary  or  advisable  to  enable  such  selling  Holder to
                  consummate the disposition of the Shares owned by such Holder,
                  in such  jurisdictions;  provided,  however,  that the Company
                  shall  not  be  required  in  connection  therewith  or  as  a
                  condition thereto to qualify to transact business or to file a
                  general  consent to  service of process in any such  states or
                  jurisdictions.

                           (v)  Promptly  notify  each  selling  Holder  of  the
                  happening  of any event as a result  of which  the  prospectus
                  included  in such  registration  statement  contains an untrue
                  statement  of a material  fact or omits any fact  necessary to
                  make the statements therein not misleading and, at the request
                  of any such Holder,  the Company will prepare a supplement  or
                  amendment to such prospectus so that, as thereafter  delivered
                  to the  purchasers of such Shares,  such  prospectus  will not
                  contain  an untrue  statement  of a  material  fact or omit to
                  state any fact  necessary to make the  statements  therein not
                  misleading  and the  Holder(s)  shall  suspend  trading at the
                  request  of the  Company  if,  upon  advice of  counsel to the
                  Company, such suspension is advisable.

                           (vi) Provide a transfer  agent and  registrar for all
                  such  Shares  not  later  than  the  effective  date  of  such
                  registration statement.




                                        8






                           (vii) Enter into such customary agreements (including
                  underwriting  agreements  in  customary  form  for  a  primary
                  offering) and take all such other actions as the underwriters,
                  if any,  reasonably request in order to expedite or facilitate
                  the disposition of such Shares (including, without limitation,
                  effecting a stock split or a combination of shares).

                           (viii) Make  available for  inspection by any selling
                  Holder or any  underwriter  participating  in any  disposition
                  pursuant  to such  registration  statement  and any  attorney,
                  accountant or other agent  retained by any such selling Holder
                  or  underwriter,  all financial and other  records,  pertinent
                  corporate  documents and properties of the Company,  and cause
                  the officers, directors, employees and independent accountants
                  of the Company to supply all information  reasonably requested
                  by any such seller, underwriter, attorney, accountant or agent
                  in connection with such registration statement.

                           (ix)  Promptly  notify the selling  Holder(s) and the
                  underwriters,   if  any,  of  the  following  events  and  (if
                  requested by any such person)  confirm  such  notification  in
                  writing:  (A) the filing of the  prospectus or any  prospectus
                  supplement and the registration statement and any amendment or
                  post-effective  amendment  thereto  and,  with  respect to the
                  registration   statement  or  any   post-effective   amendment
                  thereto,   the  declaration  of  the   effectiveness  of  such
                  documents,  (B) any requests by the  Commission for amendments
                  or supplements to the registration statement or the prospectus
                  or for additional  information,  (C) the issuance or threat of
                  issuance by the  Commission of any stop order  suspending  the
                  effectiveness of the registration  statement or the initiation
                  of any  proceedings  for that purpose,  and (D) the receipt by
                  the Company of any notification with respect to the suspension
                  of  the   qualification   of  the   Shares  for  sale  in  any
                  jurisdiction  or the initiation or threat of initiation of any
                  proceeding  for such purposes and the Holder(s)  shall suspend
                  trading  at the  request of the  Company  if,  upon  advice of
                  counsel to the Company, such suspension is advisable.

                           (x) Make every reasonable effort to prevent the entry
                  of any order suspending the  effectiveness of the registration
                  statement  and  obtain at the  earliest  possible  moment  the
                  withdrawal of any such order, if entered.

                           (xi)  Cooperate  with the selling  Holder(s)  and the
                  underwriters, if any, to facilitate the timely preparation and
                  delivery of  certificates  representing  the Shares to be sold
                  and not  bearing  any  restrictive  legends,  and enable  such
                  Shares to be in such lots and  registered in such names as the
                  underwriters  may request at least two (2) business days prior
                  to any delivery of the Shares to the underwriters.

                           (xii)  Provide a CUSIP  number for all the Shares not
                  later than the effective date of the registration statement.




                                        9






                           (xiii) [INTENTIONALLY OMITTED].

                           (xiv)  Otherwise  use its best efforts to comply with
                  all applicable  rules and regulations of the  Commission,  and
                  make  generally  available  to its security  holders  earnings
                  statements  satisfying  the provisions of Section 11(a) of the
                  Securities  Act, no later than  forty-five (45) days after the
                  end of any  twelve-month  period (or ninety (90) days, if such
                  period  is a fiscal  year)  (A)  commencing  at the end of any
                  fiscal quarter in which the Shares are sold to underwriters in
                  a firm or best efforts  underwritten  offering,  or (B) if not
                  sold to underwriters  in such an offering,  beginning with the
                  first  month  of the  first  fiscal  quarter  of  the  Company
                  commencing  after  the  effective  date  of  the  registration
                  statement,  which  statements  shall  cover such  twelve-month
                  periods.

                  (c) After the date hereof,  the Company shall not grant to any
         holder of  securities  of the  Company  any  registration  rights  with
         respect to an underwritten  offering which have a priority greater than
         or equal to those granted to Holders  pursuant to this Warrant  without
         the prior written consent of the Holder(s).

                  (d) The Company's  obligations  under Section 10(a) above with
         respect to each holder of Shares are  expressly  conditioned  upon such
         holder's   furnishing  to  the  Company  in  writing  such  information
         concerning such holder and the terms of such holder's proposed offering
         as  the  Company  shall   reasonably   request  for  inclusion  in  the
         registration  statement. If any registration statement including any of
         the Shares is filed,  then the  Company  shall  indemnify  each  holder
         thereof (and each underwriter for such holder and each person,  if any,
         who controls such underwriter within the meaning of the Securities Act)
         from any loss, claim, damage or liability arising out of, based upon or
         in any  way  relating  to  any  untrue  statement  of a  material  fact
         contained  in such  registration  statement  or any  omission  to state
         therein a material fact  required to be stated  therein or necessary to
         make  the  statements  therein  not  misleading,  except  for any  such
         statement or omission based on information furnished in writing by such
         holder  of the  Shares  expressly  for  use  in  connection  with  such
         registration  statement;  and such holder shall  indemnify  the Company
         (and  each  of  its  officers  and   directors   who  has  signed  such
         registration  statement,  each  director,  each  person,  if  any,  who
         controls the Company  within the meaning of the  Securities  Act,  each
         underwriter for the Company and each person,  if any, who controls such
         underwriter  within the meaning of the  Securities  Act) and each other
         such holder against any loss,  claim,  damage or liability arising from
         any  such  statement  or  omission  which  was  made in  reliance  upon
         information  furnished  in writing to the Company by such holder of the
         Shares   expressly  for  use  in  connection  with  such   registration
         statement.

                  (e) For  purposes of this  Section 10, all of the Shares shall
         be deemed to be issued and outstanding.

                  (f) The rights contained in this Section 10 shall expire as to
         any holder of Shares that is able to sell  Shares  pursuant to Rule 144
         of the Securities Act.




                                       10






         11.      CERTAIN NOTICES. In case at any time the Company shall propose
                  to:

                  (a)      declare any cash dividend upon its Common Stock;

                  (b)      declare any dividend upon its Common Stock payable in
         stock or make any special dividend or other distribution to the holders
         of its Common Stock;

                  (c)      offer for  subscription  to the holders of any of its
         Common  Stock  any  additional  shares  of stock in any  class or other
         rights;

                  (d)      reorganize,  or  reclassify  the capital stock of the
         Company,  or consolidate,  merge or otherwise combine with, or sell all
         or substantially all of its assets to, another corporation; or

                  (e)      voluntarily or involuntarily  dissolve,  liquidate or
         wind up the affairs of the Company;

         then,  in any one or more of said cases,  the Company shall give to the
         Holder of the Warrant,  by certified or registered  mail,  (i) at least
         twenty (20) days' prior  written  notice of the date on which the books
         of the  Company  shall  close  or a  record  shall  be  taken  for such
         dividend, distribution or subscription rights or for determining rights
         to  vote  in  respect  of any  such  reorganization,  reclassification,
         consolidation,  merger, sale,  dissolution,  liquidation or winding up,
         and  (ii)  in  the  case  of  such  reorganization,   reclassification,
         consolidation, merger, sale, dissolution, liquidation or winding up, at
         least twenty (20) days' prior written  notice of the date when the same
         shall take place. Any notice required by clause (i) shall also specify,
         in the case of any such dividend,  distribution or subscription rights,
         the date on  which  the  holders  of  Common  Stock  shall be  entitled
         thereto,  and any notice required by clause (ii) shall specify the date
         on which the  holders of Common  Stock  shall be  entitled  to exchange
         their Common Stock for  securities or other property  deliverable  upon
         such  reorganization,  reclassification,  consolidation,  merger, sale,
         dissolution, liquidation or winding up, as the case may be.

         12.      GOVERNING  LAW.  This warrant shall be governed by the laws of
         the State of Tennessee  applicable to agreements  made entirely  within
         the State.

         13.      SEVERABILITY.  If any  provision(s)  of  this  Warrant  or the
         application  thereof to any person or circumstances shall be invalid or
         unenforceable  to any extent,  the  remainder  of this  Warrant and the
         application of such provisions to other persons or circumstances  shall
         not be affected  thereby and shall be enforced to the  greatest  extent
         permitted by law.




                                       11





         14.      COUNTERPARTS.  This  Warrant  may be executed in any number of
         counterparts  and be  different  parties to this  Warrant  in  separate
         counterparts,  each of which when so executed  shall be deemed to be an
         original and all of which taken together  shall  constitute one and the
         same Warrant.

         15.      JURISDICTION  AND VENUE.  The Company  hereby  consents to the
         jurisdiction  of the  courts of the State of  Tennessee  and the United
         States District Court for the Middle District of Tennessee,  as well as
         to the  jurisdiction  of all  courts  from which an appeal may be taken
         from  such  courts,  for the  purpose  of any  suit,  action  or  other
         proceeding  arising out of any of its  obligations  arising  under this
         Agreement or with respect to the transactions  contemplated hereby, and
         expressly  waives any and all objections it may have as to venue in any
         such courts.

         IN WITNESS  WHEREOF,  the parties hereto have set their hands as of the
date first above written.

                                       SUPERIOR PHARMACEUTICAL COMPANY,
                                       an Ohio corporation


                                       By:  Dhananjay G. Wadekar
                                          --------------------------------------

                                       Title:  Director
                                             -----------------------------------

                                       ODYSSEY INVESTMENT PARTNERS, L.P., a
                                       Pennsylvania limited partnership

                                       By: ODYSSEY ASSOCIATES, L.P., its General
                                       Partner

                                       By: ODYSSEY ASSOCIATES, INC., its General
                                       Partner



                                       By:  ILLEGIBLE
                                          --------------------------------------

                                       Title:  President
                                             -----------------------------------




                                       12




                                                                    EXHIBIT 4.22
                                                                    ------------

                                                    THE HUNTINGTON NATIONAL BANK
                                                          REVOLVING NOTE (LIBOR)

================================================================================
City Office CINCINNATI Division 2167 Branch CINCINNATI [X] Secured
            ----------          ----        ----------

Account No. 8537609377    Note No.                  [ ] Unsecured
           ------------           --------------

Account Name SUPERIOR PHARMACEUTICAL COMPANY
             -----------------------------------------------------

[X] Corporation   [ ] Partnership   [ ] Individual/Proprietorship

[ ] Other 
          --------------------------------------------------------

Bank Approval Officer Initial ____ Bank Closing Officer Initial____
================================================================================

$9,000,000.00                 CINCINNATI, OHIO                     JUNE 18, 1997

         FOR VALUE RECEIVED, the undersigned, jointly and severally if more than
one,  promise to pay to the order of The Huntington  National Bank  (hereinafter
called the "Bank",  which term shall include any holder hereof) at such place as
the Bank may  designate  or, in the absence of such  designation,  at any of the
Bank's  offices,  the sum of NINE MILLION  DOLLARS  ($9,000,000.00),  or so much
thereof as shall have been  advanced  by the Bank at any time and not  hereafter
repaid  (hereinafter  called the  "Principal  Sum")  together  with  interest as
hereinafter  provided,   and  payable  at  the  time(s)  and  in  the  manner(s)
hereinafter provided. The proceeds of the loan evidenced hereby may be advanced,
repaid  and  readvanced,  in partial  amounts,  during the term of this Note and
prior to maturity;  provided, that no partial advance of the Principal Sum shall
be for less than $N/A (which shall be $0.00,  unless  completed)  and no partial
advance shall be made after April 5, 1998 which shall not be applicable,  unless
completed).  Each such advance shall be made to the undersigned  upon receipt by
the Bank of disbursement  instructions and upon receipt,  review and approval by
the Bank of the undersigned's application for an advance, which shall be in such
form and contain such information as the Bank shall from time to time prescribe.
The Bank  shall be  entitled  to rely on any  oral or  telephonic  communication
requesting an advance  and/or  providing  disbursement  instructions  hereunder,
which shall be received by it in good faith from anyone  reasonably  believed by
the Bank to be the  undersigned,  or the  undersigned's  authorized  agent.  The
undersigned  agree  that all  advances  made by the Bank  will be  evidenced  by
entries  made by the Bank into its  electronic  data  processing  system  and/or
internal  memoranda  maintained by the Bank. The undersigned  further agree that
the sum or sums shown on the most  recent  printout  from the Bank's  electronic
data system and/or such memoranda  shall be rebuttably  presumptive  evidence of
the amount of the Principal sum and of the amount of any accrued interest.  Each
request for an advance  shall  constitute a warranty and  representation  by the
undersigned  that no event  of  default  hereunder  or under  any  related  loan
documents has occurred and is continuing and that no event or circumstance which
would  constitute such an event of default,  but for the requirement that notice
be given or time elapse or both, has occurred and is continuing.

         [X] If marked,  this Note is  executed  and any  advances  contemplated
hereunder  are to be made  pursuant to an Amended and Restated Loan and Security
Agreement  of even  date  and all the  covenants,  representations,  agreements,
terms,  and  conditions  contained  therein,  including,  but  not  limited  to,
additional  conditions of default and  conditions to any partial  advances,  are
incorporated herein as if fully rewritten.








         This note is executed and the advances contemplated hereunder are to be
made  pursuant  to a line of  credit  under  which  the Bank has  indicated  its
willingness  to extend credit from time to time to the  undersigned,  but is not
obligated to do so.

INTEREST

         Prior to maturity,  interest  will accrue on the unpaid  balance of the
Principal  Sum at a variable  rate of  interest  per annum,  as  selected by the
undersigned  in  accordance  with this Note  (hereinafter  called the  "Contract
Rate"), which shall change in the manner set forth below, equal to:

         (1) The Prime Commercial Rate (hereinafter defined); OR

         (2) Two  (2.00)  percentage  points  in  excess  of the  LIBO  Rate (as
hereinafter defined).

         The  undersigned  shall give the Bank written or  telephonic  notice of
each  request  to  change  the  interest  index  from the LIBO Rate to the Prime
Commercial  Rate or vice versa no later than 10:00 a.m.  Ohio time five  Banking
Days (as hereinafter defined) prior to the date of the proposed change.

         Notwithstanding  anything  else to the  contrary  that may be contained
herein,  at no time shall the Contract Rate, when based on the Prime  Commercial
Rate,  be less than  N/A% per  annum  (which  shall  not be  applicable,  unless
competed)  nor more than N/A% per annum (which shall not be  applicable,  unless
competed),  or, when based on the LIBO Rate,  be less than N/A% per annum (which
shall not be applicable,  unless  completed) nor more than N/A% per annum (which
shall not be applicable, unless completed).

         If the  obligation  evidenced  by this  Note is not  paid at  maturity,
whether maturity occurs by lapse of time, demand, acceleration or otherwise, the
unpaid balance of the Principal Sum and any unpaid  interest  shall,  thereafter
until paid, bear interest at a rate equal to two (2.00) percentage points (which
shall be 0.00  percentage  points,  unless  completed) in excess of the Contract
Rate.

         As used herein,  Prime  Commercial Rate shall mean the rate established
by the Bank from time to time  based on its  consideration  of  economic,  money
market,  business and competitive  factors, and it is not necessarily the Bank's
most favored rate.

         As used herein,  LIBO Rate shall mean the rate obtained by dividing (1)
actual or  estimated  per annum rate,  or the  arithmetic  mean of the per annum
rates, of interest for deposits in U.S. dollars for thirty (30) day periods,  as
offered and determined by the Bank in its sole discretion based upon information
which appears on page 3750, captioned British Bankers Assoc. Interest Settlement
Rates,  of Telerate a service of Telerate  Systems  Incorporated  (or such other
page that may replace  that page on that  service for the purpose of  displaying
LIBO rates;  or, if such service ceases to be available,  such other  reasonably
comparable  money  rate  service  as the Bank may  select)  or upon  information
obtained from any other reasonable procedure,  on each date the Contract Rate is
determined;  by (2) an  amount  equal  to one  minus  the  stated  maximum  rate
(expressed  as a  decimal),  if any,  of all  reserve  requirements  (including,
without  limitation,  any marginal,  emergency,  supplemental,  special or other
reserves)  that is specified on each date the Contract Rate is determined by the
Board of  Governors  of the  federal  Reserve  System (or any  successor  agency
thereto)  for  determining  the  maximum  reserve  requirement  with  respect to
eurocurrency  funding  (currently  referred to as "Eurocurrency  liabilities" in
Regulation D of such Board)  maintained by a member bank of such System,  or any
other regulations






of any governmental  authority having jurisdiction with respect thereto,  all as
conclusively  determined  by the Bank,  absent  manifest  error,  such sum to be
rounded up, if necessary,  to the nearest whole multiple of one-sixteenth of one
percent (1/16 of 1.0%) per annum.

         Subject to any maximum or minimum  interest rate  limitation  specified
herein or any  applicable  law,  the Contract  Rate shall  change  automatically
without  notice to the  undersigned  immediately  on each  Banking Day with each
change  in  the  Prime  Commercial  Rate  or in the  LIBO  Rate  or the  reserve
requirement,  as applicable, with any change thereto effective as of the opening
of business on the day of the change.

         As used herein, Banking Day shall mean any day other than a Saturday or
Sunday on which banks are open for  business  in  Columbus,  Ohio,  and on which
banks in London, England, settle payments.

         All interest shall be calculated on the basis of a 360 day year for the
actual  number of days the  Principal  sum or any part thereof  remains  unpaid.
There shall be no penalty for prepayment.  The amount of any payment shall first
be applied to the payment of any interest which is due.

         In the event that any date the Bank shall reasonably determine that the
making or  continuation of advances based upon the LIBO Rate has become unlawful
by  compliance  by the  Bank in good  faith  with any  law,  governmental  rule,
regulation or order,  then, and in any such event,  the Bank shall promptly give
notice thereof to the undersigned.  In such case, the ability of the undersigned
to request an advance  hereunder shall be terminated and the undersigned  shall,
when  required by law,  repay the  Principal  Sum,  together  with all  interest
accrued thereon.

MANNER OF PAYMENT

         The  Principal  Sum shall be  payable  on April 5,  1998,  and  accrued
interest  shall be due and payable  monthly,  beginning  on May 5, 1997,  and at
maturity, whether by demand, acceleration or otherwise.

LATE CHARGE

         Any  installment  or other  payment not made within 10 days of the date
such payment or installment is due shall be subject to a late charge equal to 5%
of the amount of the installment or payment.

SECURITY

         As security for the payment of the obligations  evidenced  hereby,  and
all other  obligations and liabilities of the undersigned,  and each of them, to
the Bank,  whether now existing or hereafter  arising,  the  undersigned  hereby
grant Bank a security interest or mortgage in the following property,  including
all substitutions and additions thereto, and the proceeds thereof (all, together
with any other  property in which the Bank shall at any time be given a security
interest, hereinafter referred to as the "Collateral"):

ALL OF THE  PROPERTY  FURTHER  DESCRIBED  IN AN AMENDED  AND  RESTATED  LOAN AND
SECURITY AGREEMENT OF EVEN DATE.

         If, at the time of payment and discharge hereof, any of the undersigned
shall be then directly or  contingently  liable to the Bank as maker,  indorser,
surety or guarantor of any other note,  bill of exchange,  or other  instrument,
then the Bank may continue to hold any of the  Collateral as security  therefor,
even through this Note shall have been surrendered to the undersigned.  The Bank
shall not be bound to take any steps  necessary  to  preserve  any rights in the
Collateral






against prior parties. If any obligation evidenced by this Note is not paid when
due,  the  Bank  may,  at its  option,  demand,  sue  for,  collect  or make any
compromise or settlement it deems  desirable with  reference to the  Collateral,
and shall  have the  rights of a  secured  party  under the laws of the State of
Ohio, and the undersigned shall be liable for any deficiency.

DEFAULT

         Upon the occurrence of any of the following events:

         (1) the undersigned  fails to pay any installment when due hereunder or
to perform any obligation of the undersigned to the Bank;

         (2) the  undersigned  fails to do all things  necessary to preserve and
maintain the value and collectability of the Collateral;

         (3) any event occurs and continues  which  constitutes a default by any
of the undersigned under any other obligation to or agreement with the Bank;

         (4) the Collateral  declines in value or becomes  unsatisfactory to the
Bank and the undersigned  fails to furnish  immediately  upon demand  additional
Collateral satisfactory to the Bank;

         (5) any  guarantor  revokes  its  guaranty,  or any  event  occurs  and
continues which constitutes a default by any guarantor under its guaranty;

         (6) the  undersigned  fails  to  furnish  true and  complete  financial
statements from time to time on request of the Bank;

         (7)  the  death  or  dissolution  of  any of  the  undersigned,  or any
indorser, surety, accommodation party or guarantor;

         (8) any representation, warranty or other information given to the Bank
by any of the undersigned,  or by an indorser,  surety,  accommodation  party or
guarantor proves to be false, untrue or misleading; or

         (9) the Bank for any reason deems itself  insecure  with respect to the
obligations evidenced hereby;

then the Bank may,  at its  option,  without  notice or demand,  accelerate  the
maturity of the obligations  evidenced  hereby,  which  obligations shall become
immediately due and payable and the  undersigned  shall no longer have the right
to  receive  advances  or  readvances  hereunder.  In the event  the Bank  shall
institute  any action  for the  enforcement  or  collection  of the  obligations
evidenced  hereby,  the undersigned  agree to pay all costs and expenses of such
action, including reasonable attorneys' fees, to extent permitted by law.

GENERAL PROVISIONS

         All of the parties  hereto,  including the  undersigned,  any indorser,
surety,   accommodation   party  or  guarantor,   hereby:  (1)  severally  waive
presentment,  notice of  dishonor,  protest,  notice of  consent  that,  without
discharging or modifying the duties of any of them and without notice,  the Bank
may (A) extend the time of payment an unlimited  number of times before or after
maturity,  (B) grant any other  indulgence  at any time and from time to time to
any party hereto, (c) delay in exercising or omit to exercise any right against,
or delay in taking or omit to take any party  hereto,  (D) release or modify any
collateral,  security or guaranties; and (3) severally waive any claim, right or
remedy  which such party may now have or  hereafter  acquire  against  any other
party or parties hereto that arises






hereunder and/or from the performance by such party hereunder including, without
limitation,   any  claim,   remedy  or  right  of  subrogation,   reimbursement,
exoneration, contribution,  indemnification or participation in any claim, right
or remedy of the Bank against the other party or parties,  or any security which
the Bank now has or  hereafter  acquires,  whether  such claim,  right or remedy
arises in equity, under contract, by statute, under common law or otherwise. The
Bank shall not be required to purse any party hereto, including an guarantor, or
to exercise any rights  against any  Collateral  herefor  before  exercising any
other such rights.

         The obligations  evidenced hereby may from time to time be evidenced by
another note or notes given in substitution,  renewal or extension  hereof.  Any
security  interest or mortgage which secures the  obligations  evidenced  hereby
shall  remain in full force and effect  notwithstanding  any such  substitution,
renewal, or extension.

         No waiver of any term or  condition  of this  Note  shall be  effective
unless in writing  and signed by the party  giving or granting  the  waiver.  No
amendment of any term or  condition  of this Note shall be  effective  unless in
writing and signed by the  undersigned  and the Bank. No failure or delay on the
part of the Bank in exercising  any right,  power or privilege  under this Note,
related  loan  documents  or law nor any course of dealing,  shall  operate as a
waiver of such  right,  power or  privilege  or  preclude  any other or  further
exercise thereof or of any other right, power or privilege.

         The captions used herein are for reference only and shall not be deemed
a part of this  Note.  If any of the terms or  provisions  of this Note shall be
deemed  enforceable,  the  enforceability  of the remaining terms and provisions
shall  not be  affected.  This  Note  shall  be  governed  by and  construed  in
accordance with the law of the State of Ohio.

         The  undersigned  agree that, to the extent that any of the undersigned
make a payment or payments to the Bank,  or the Bank  receives  any  proceeds of
Collateral,  which  payment or  payments  or  proceeds  or any part  thereof are
subsequently invalidated,  declared to be fraudulent or preferential,  set aside
and/or  required to be repaid to any of the  undersigned,  its estate,  trustee,
receiver or any other party,  including without limitation any guarantor,  under
any bankruptcy law, state or federal law, common law or equitable cause, then to
the extent of such payment or repayment,  the obligations under this Note or the
part thereof  which has been paid,  reduced or satisfied by such amount shall be
reinstated  and  continued  in full force and effect as of the date such initial
payment, reduction or satisfaction occurred.

WARRANT OF ATTORNEY

         Each of the undersigned  authorize any attorney at law to appear in any
Court of Record in the State of Ohio or in any other state or  territory  of the
United States of America after the above  indebtedness  becomes due,  whether by
acceleration or otherwise,  to waive the issuing and service of process,  and to
confess judgement against an one or more of the undersigned in favor of the Bank
for the amount then  appearing due together with cost of suit,  and thereupon to
waive  all  errors  and all  rights of appeal  and stays of  execution.  No such
judgment or judgments against less than all of the undersigned shall be a bar to
a subsequent  judgment or judgments  against any one or more of the  undersigned
against  whom  judgment  has not been  obtained  hereon,  this being a joint and
several warrant of attorney to confess judgment.  The attorney at law authorized
hereby to appear  for each of the  undersigned  may be an  attorney  at law also
representing  the Bank, and each of the undersigned  hereby  expressly waive any
conflict of interest that may exist by virtue of such representation.





WAIVER OF RIGHT TO TRIAL BY JURY

         EACH OF THE UNDERSIGNED  ACKNOWLEDGES  THAT, AS TO ANY AND ALL DISPUTES
THAT MAY ARISE  BETWEEN  ANY OF THE  UNDERSIGNED  AND THE BANK,  THE  COMMERCIAL
NATURE OF THE  TRANSACTION  OUT OF WHICH THIS NOTE ARISES MAKES ANY SUCH DISPUTE
UNSUITABLE FOR TRIAL BY JURY. ACCORDINGLY, EACH OF THE UNDERSIGNED HEREBY WAIVES
ANY RIGHT TO TRIAL BY JURY AS TO ANY AND ALL DISPUTES THAT MAY ARISE RELATING TO
THIS NOTE OR TO ANY OF THE  INSTRUMENTS  OR  DOCUMENTS  EXECUTED  IN  CONNECTION
HEREWITH.

                                     WARNING

BY SIGNING THIS PAPER,  YOU GIVE UP YOUR RIGHT TO NOTICE AND A COURT  TRIAL.  IF
YOU DO NOT PAY ON TIME, A COURT  JUDGMENT MAY BE TAKEN  AGAINST YOU WITHOUT YOUR
PRIOR  KNOWLEDGE,  AND THE  POWERS  OF A COURT CAN BE USED TO  COLLECT  FROM YOU
REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR, WHETHER FOR RETURNED
GOODS,  FAULTY GOODS,  FAILURE ON HIS PART TO COMPLY WITH THE AGREEMENT,  OR ANY
OTHER CAUSE.


BORROWER:
SUPERIOR PHARMACEUTICAL COMPANY
AN OHIO CORPORATION


BY:  /s/ DENNIS B. SMITH         BY:  /s/ ERIC C. HAGERSTRAND
     ----------------------           ------------------------------
     DENNIS B. SMITH                  ERIC C. HAGERSTRAND
     PRESIDENT, CEO                   VICE PRESIDENT, SECRETARY, CFO




                                                                    EXHIBIT 99.1

                                 LOAN AGREEMENT


         THIS LOAN  AGREEMENT  ("Agreement"),  dated as of the 18th day of June,
1997,  is made and  entered  into on the terms and  conditions  hereinafter  set
forth, by and between DYNAGEN,  INC., a Delaware corporation  ("Borrower"),  and
SIRROM  CAPITAL  CORPORATION,  a Tennessee  corporation  ("Sirrom")  and ODYSSEY
INVESTMENT  PARTNERS,  L.P.,  a  Pennsylvania  limited  partnership  ("Odyssey")
(Sirrom and Odyssey are sometimes  referred to herein  individually  as "Lender"
and collectively as the "Lenders").


                                    RECITALS:

         WHEREAS,  Borrower has requested that Sirrom make available to Borrower
a term  loan in the  principal  amount  of Two  Million  and  No/100ths  Dollars
($2,000,000.00) (the "Sirrom Loan") on the terms and conditions  hereinafter set
forth, and for the purpose(s) hereinafter set forth; and

         WHEREAS, Borrower has requested that Odyssey make available to Borrower
a term  loan in the  principal  amount  of One  Million  and  No/100ths  Dollars
($1,000,000)  (the "Odyssey  Loan") on the terms and conditions  hereinafter set
forth, and for the purpose(s) hereinafter set forth; and

                  WHEREAS, the Sirrom Loan and the Odyssey Loan are hereinafter
collectively referred to as the "Loan"; and

         WHEREAS,  in  order to  induce  Lenders  to make the Loan to  Borrower,
Borrower has made certain representations to Lenders; and

         WHEREAS,  Lenders, in reliance upon the representations and inducements
of  Borrower,  have  agreed  to make the  Loan  upon the  terms  and  conditions
hereinafter set forth.


                                   AGREEMENT:

         NOW,  THEREFORE,  in  consideration of the agreement of Lenders to make
the Loan, the mutual  covenants and agreements  hereinafter set forth, and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Borrower and Lenders hereby agree as follows:








                                    ARTICLE 1
                                    THE LOAN

         1.1 Evidence of Loan  Indebtedness and Repayment.  Subject to the terms
and conditions hereof, Lenders shall advance an aggregate total of $3,000,000.00
of the Loan  proceeds to Borrower by wire  transfer on the date hereof to or for
the  benefit of  Borrower  in  immediately  available  funds.  The Loan shall be
evidenced by Secured Promissory Notes in the aggregate principal amount of Three
Million and  No/100ths  Dollars  ($3,000,000.00),  substantially  in the form of
Exhibits A-1 and A-2 attached hereto and  incorporated  herein by this reference
(the  "Notes"),  dated as of the date  hereof,  and  executed by Borrower to the
order of Lenders, respectively. The Loan shall be payable in accordance with the
terms of the Notes,  this  Agreement  and any other  instruments  and  documents
executed by Borrower,  any Subsidiary (as hereinafter defined), any guarantor of
Borrower, or any shareholder of Borrower, now or hereafter evidencing,  securing
or in any way  related  to the  indebtedness  evidenced  by the Notes  (all such
notes,  instruments,  agreements and other documents being hereinafter sometimes
individually  referred to as a "Loan Document" and  collectively  referred to as
the "Loan Documents").

         1.2 Processing  Fee.  Borrower shall pay a processing fee of $45,000 to
Sirrom,  $33,750 of which  shall be paid prior to  closing  with the  balance of
$11,250 to be paid at closing.  Borrower shall pay an application fee of $10,000
to  Odyssey,  all of which shall be paid at closing and a closing fee of $12,500
to Odyssey, all of which shall be paid at closing.

         1.3  Purpose(s)  of Loan and Use of Proceeds.  The purposes of the Loan
shall be to acquire all of the capital stock of Superior  Pharmaceutical Company
("Superior")  through a wholly owned subsidiary of Borrower,  to provide working
capital to Borrower,  and to pay all costs and expenses  incurred by the parties
hereto in  connection  with the making and  documenting  of the Loan,  including
attorneys' fees and expenses. The proceeds of the Loan shall not be used for any
other purpose.

         1.4 Prepayment. Borrower may prepay the Loan in whole or in part at any
time and from time to time without premium or penalty.


                                    ARTICLE 2
                         REPRESENTATIONS AND WARRANTIES

         2.1 Borrower's Representations. Borrower hereby represents and warrants
to  Lenders  as  follows,  except  as  disclosed  in any  schedule  hereto.  The
disclosures  in any schedule  hereto shall  qualify  every other section of this
Agreement to the extent it is  reasonably  clear from a reading of such schedule
that the disclosures contained therein are applicable to such other sections.






                                        2





                  (a)  Corporate   Status.   Borrower  is  a  corporation   duly
         organized,  validly existing and in good standing under the laws of the
         State of Delaware;  and has the corporate  power to own and operate its
         properties, to carry on its business as now conducted and to enter into
         and to perform its obligations  under this Agreement and the other Loan
         Documents  to which it is a party.  Borrower  is duly  qualified  to do
         business and is in good standing in the  Commonwealth of  Massachusetts
         and every other state in which a failure to be so qualified and in good
         standing would have a material  adverse effect on Borrower's  financial
         position  or its  ability to  conduct  its  business  in the manner now
         conducted.

                  (b) Other Business Organizations.  Schedule 2.1(b) hereto is a
         complete list of each corporation,  partnership, joint venture or other
         business organization (any such corporation, partnership, joint venture
         or other business  organization in which Borrower holds more than a 50%
         interest is referred to herein as a  "Subsidiary"  or, with  respect to
         all such  organizations,  the  "Subsidiaries") in which Borrower or any
         Subsidiary  owns,  directly or  indirectly,  any capital stock or other
         equity  interest,  or with respect to which Borrower or any Subsidiary,
         alone or in combination with others,  is in a control  position,  which
         list shows the jurisdiction of incorporation or other  organization and
         the  percentage  of stock or other equity  interest of each  Subsidiary
         owned by  Borrower.  Each  Subsidiary  which is a  corporation  is duly
         organized,  validly existing and in good standing under the laws of the
         jurisdiction  of its  incorporation  and is duly  qualified to transact
         business  as a  foreign  corporation  and is in  good  standing  in the
         jurisdictions   listed  in   Schedule   2.1(b),   which  are  the  only
         jurisdictions  where the  properties  owned or  leased or the  business
         transacted by it makes such licensing or  qualification  to do business
         as a  foreign  corporation  necessary,  and no other  jurisdiction  has
         demanded,  requested or otherwise  indicated that (or inquired whether)
         it  is  required  so  to  qualify.  Each  Subsidiary  which  is  not  a
         corporation  is duly  organized and validly  existing under the laws of
         the jurisdiction of its organization.  The outstanding capital stock of
         each Subsidiary  which is a corporation is validly  issued,  fully paid
         and  nonassessable.  Borrower and the Subsidiaries  have good and valid
         title to the equity  interests  in the  Subsidiaries  shown as owned by
         each of them on Schedule 2.1(b),  free and clear of all liens,  claims,
         charges,  restrictions,  security interests, equities, proxies, pledges
         or  encumbrances of any kind,  except as set forth on Schedule  2.1(b).
         Except where otherwise  indicated herein,  any reference to Borrower in
         this Agreement shall include Borrower and all of its Subsidiaries.

                  (c)  Authorization.  Borrower has full legal right,  power and
         authority to conduct its business and affairs.  Borrower has full legal
         right,  power and  authority  to enter into and perform its  respective
         obligations under the Loan Documents to which each is a party,  without
         the consent or approval of any other person, firm,  governmental agency
         or other  legal  entity,  except as set forth on Schedule  2.1(c).  The
         execution and delivery of this Agreement,  the borrowing hereunder, the
         execution  and  delivery of each Loan  Document to which  Borrower is a
         party,  and the  performance by Borrower of its respective  obligations
         thereunder are within the




                                        3





         corporate  powers of  Borrower  and have been  duly  authorized  by all
         necessary  corporate action properly taken, have received all necessary
         governmental  approvals,  if any were required, and do not and will not
         contravene  or  conflict  with any  provision  of law,  any  applicable
         judgment,  ordinance,  regulation or order of any court or governmental
         agency,  the articles of  incorporation  or bylaws of Borrower,  or any
         agreement  binding  upon  Borrower.   The  officer(s)   executing  this
         Agreement,  the  Notes  and all of the other  Loan  Documents  to which
         Borrower is a party are duly authorized to act on behalf of Borrower.

                  (d) Validity and Binding Effect.  This Agreement and the other
         Loan  Documents to which the  Borrower is a party are the legal,  valid
         and binding obligations of Borrower,  and are enforceable in accordance
         with their  respective  terms,  subject only to limitations  imposed by
         bankruptcy,  insolvency, moratorium or other similar laws affecting the
         rights of creditors  generally or the application of general  equitable
         principles.

                  (e)  Capitalization.  As of the date  hereof,  the  authorized
         capital stock of Borrower  consists solely of (i) 75,000,000  shares of
         common  stock,  $.01 par  value per share  ("Common  Stock"),  of which
         32,164,144  shares are issued and outstanding (the "Common Shares") and
         (ii) 10,000,000 shares of preferred stock, $.01 par value per share, of
         which 50,000 shares have been  designated  Series A Preferred  Stock of
         which  41,000  shares  are issued and  outstanding  and of which  7,500
         shares have  designated as Series B Preferred  Stock,  all of which are
         issued  and  outstanding.  400,000  shares  of  Common  Stock  shall be
         reserved  for issuance  upon  exercise of the Stock  Purchase  Warrants
         dated as of the date  hereof  and  issued  to  Lenders  (the  "Borrower
         Warrants");  provided,  however,  that the  number  of shares of Common
         Stock  reserved for  issuance  upon  exercise of the Borrower  Warrants
         shall be increased  from time to time in  accordance  with the terms of
         the Borrower Warrants.  As of the date hereof,  except for the Borrower
         Warrants and as may otherwise be set forth on Schedule 2.1(e), Borrower
         does not  have  outstanding  any  stock or  securities  convertible  or
         exchangeable  for any  shares of its  Common  Stock or  containing  any
         profit participation features, nor shall it have outstanding any rights
         or options to  subscribe  for or to  purchase  its Common  Stock or any
         stock or securities  convertible  into or  exchangeable  for its Common
         Stock or any stock appreciation rights or phantom stock plans. Schedule
         2.1(e)  accurately  sets  forth  the  following  with  respect  to  all
         outstanding  options and rights to acquire the Borrower's  Common Stock
         from Borrower: (i) the total number of shares issuable upon exercise of
         all outstanding options, (ii) the range of exercise prices for all such
         outstanding options,  (iii) the number of shares issuable, the exercise
         price and the expiration date for each such outstanding option and (iv)
         with respect to all outstanding options, warrants and rights to acquire
         Borrower's Common Stock other than the Borrower  Warrants,  the holder,
         the number of shares  covered,  the exercise  price and the  expiration
         date.  As of the date  hereof,  Borrower  does not have any  obligation
         (contingent  or otherwise) to repurchase,  redeem,  retire or otherwise
         acquire  any  shares  of its  Common  Stock or to issue  any  warrants,
         options or other rights to acquire its Common Stock, except




                                        4





         as set forth in the Borrower  Warrants or on Schedule 2.1(e). As of the
         date hereof,  all of the outstanding  shares of Borrower's Common Stock
         have been validly issued,  fully paid and are nonassessable.  Except as
         may be set  forth  on  Schedule  2.1(e),  there  are  no  statutory  or
         contractual  preemptive rights, rights of first refusal,  anti-dilution
         rights  or  any  similar  rights,  held  by  any  person,  corporation,
         partnership,   limited   liability   company  or  other  legal  entity,
         including,  but not limited to,  stockholders  or other  holders of any
         securities  of  the  Borrower,  with  respect  to the  issuance  of the
         Borrower  Warrants or the issuance of the Common Stock upon exercise of
         the Borrower  Warrants.  All such rights granted in the  documents,  if
         any,  listed on Schedule  2.1(e) have been  effectively and irrevocably
         waived to the extent  required  (if any) with regard to the issuance of
         the Borrower  Warrants,  the exercise of the Borrower  Warrants and the
         issuance of the Common Stock upon  exercise of the  Borrower  Warrants.
         Borrower has not violated any  applicable  federal or state  securities
         laws in  connection  with the  offer,  sale or  issuance  of any of its
         Common Stock, and the offer, sale and issuance of the Borrower Warrants
         hereunder do not require  registration  under the Securities Act or any
         applicable state securities laws. To the best of Borrower's  knowledge,
         there are no agreements among Borrower's  stockholders  with respect to
         any other aspect of Borrower's affairs, except as set forth on Schedule
         2.1(e). As of the date hereof, the authorized capital stock of Superior
         consists  solely of (i) 750  shares of common  stock,  no par value per
         share  ("Superior  Common  Stock"),  of which 100 shares are issued and
         outstanding (the "Superior Common Shares") and 35 shares of which shall
         be reserved for issuance upon exercise of the Stock  Purchase  Warrants
         dated as of the date  hereof and issued to  Lenders  by  Superior  (the
         "Superior Warrants");  provided,  however, that the number of shares of
         Common  Stock  reserved  for  issuance  upon  exercise of the  Superior
         Warrants  shall be increased  from time to time in accordance  with the
         terms of the Superior Warrants.  As of the date hereof,  except for the
         Superior Warrants and as may otherwise be set forth on Schedule 2.1(e),
         no Subsidiary has  outstanding  any stock or securities  convertible or
         exchangeable  for any  shares of its  common  stock or  containing  any
         profit participation features, nor shall it have outstanding any rights
         or options to  subscribe  for or to  purchase  its common  stock or any
         stock or securities  convertible  into or  exchangeable  for its common
         stock or any stock appreciation rights or phantom stock plans. Schedule
         2.1(e)  accurately  sets  forth  the  following  with  respect  to  all
         outstanding  options  and  rights  to  acquire  common  stock  from any
         Subsidiary:  (i) the total number of shares  issuable  upon exercise of
         all outstanding options, (ii) the range of exercise prices for all such
         outstanding options,  (iii) the number of shares issuable, the exercise
         price and the expiration date for each such outstanding option and (iv)
         with respect to all outstanding options, warrants and rights to acquire
         any  Subsidiary's  common stock other than the Superior  Warrants,  the
         holder,  the  number  of shares  covered,  the  exercise  price and the
         expiration  date.  As  of  the  date  hereof,  no  Subsidiary  has  any
         obligation  (contingent or otherwise) to repurchase,  redeem, retire or
         otherwise  acquire  any  shares  of its  common  stock or to issue  any
         warrants,  options or other rights to acquire its common stock,  except
         as set forth in the Superior  Warrants or on Schedule 2.1(e). As of the
         date hereof, all of the outstanding shares of each Subsidiary's  common
         stock have been validly issued,




                                        5





         fully  paid  and  are  nonassessable.  Except  as may be set  forth  on
         Schedule  2.1(e),  there are no  statutory  or  contractual  preemptive
         rights,  rights of first refusal,  anti-dilution  rights or any similar
         rights, held by any person, corporation, partnership, limited liability
         company  or  other  legal  entity,   including,  but  not  limited  to,
         stockholders or other holders of any securities of any Subsidiary, with
         respect to the issuance of the Superior Warrants or the issuance of the
         common stock upon  exercise of the Superior  Warrants.  All such rights
         granted in the documents,  if any,  listed on Schedule 2.1(e) have been
         effectively and  irrevocably  waived with regard to the issuance of the
         Superior  Warrants,  the  exercise  of the  Superior  Warrants  and the
         issuance of the common stock upon exercise of the Superior Warrants. No
         Subsidiary has violated any applicable federal or state securities laws
         in  connection  with the offer,  sale or  issuance of any of its Common
         Stock,  and the offer,  sale and  issuance of the  Subsidiary  Warrants
         hereunder do not require  registration  under the Securities Act or any
         applicable state securities laws. To the best of Borrower's  knowledge,
         there are no agreements among Subsidiary's stockholders with respect to
         any  other  aspect  of  Subsidiary's  affairs,  except  as set forth on
         Schedule 2.1(e). The Borrower Warrants and the Subsidiary  Warrants are
         sometimes   referred  to  herein   individually   as  a  "Warrant"  and
         collectively  as the  "Warrants."  For purposes of this Section 2.1(e),
         the term "Subsidiary" shall not include Able Laboratories, Inc.

                  (f) Trademarks,  Patents,  Etc. Schedule 2.1(f) is an accurate
         and complete  list of all  patents,  patent  applications,  trademarks,
         trademark registrations, trademark applications, service marks, service
         mark  registrations,  service mark applications,  trade names,  service
         names, copyrights, patents, trademark and/or know-how licenses owned or
         granted to or by  Borrower or which are used or required by Borrower in
         the operation of its business, title to each of which is, except as set
         forth in Schedule 2.1(f) hereto, held by Borrower free and clear of all
         adverse  claims,  liens,  security  agreements,  restrictions  or other
         encumbrances.  There  is no  infringement  action,  lawsuit,  claim  or
         complaint  which  asserts  that any patent,  trademark,  service  mark,
         copyright  owned or licensed  by or to  Borrower  or any of  Borrower's
         products,  processes,  know-how or  operations  violate or infringe the
         patents,  trademarks,  trade names,  service  names,  or  copyrights of
         others,  nor, to the best of Borrower's  knowledge,  is Borrower in any
         way making use of any confidential  information or trade secrets of any
         person except with the consent of such person.

                  (g) No  Conflicts.  Consummation  of the  transactions  hereby
         contemplated  and the  performance of the obligations of Borrower under
         and  pursuant to the Loan  Documents  to which each is a party will not
         result in any breach of, or constitute a default  under,  any mortgage,
         security deed or agreement,  deed of trust,  lease, bank loan or credit
         agreement,  articles of  incorporation  or bylaws,  material  contract,
         license,  franchise  or  any  other  material  instrument  or  material
         agreement  to which  Borrower is a party or by which  Borrower,  or its
         respective properties may be bound or affected as to which Borrower has
         not obtained an effective and irrevocable waiver.





                                        6





                  (h) Litigation.  Except as set forth on Schedule 2.1(h), there
         are no actions, suits,  proceedings or arbitrations pending, or, to the
         knowledge  of  Borrower,  threatened,  against  or  affecting  Borrower
         required to be disclosed in Borrower's  filings with the Securities and
         Exchange  Commission or involving the validity or enforceability of any
         of the Loan Documents at law or in equity,  or before any  governmental
         or administrative agency required to be disclosed in Borrower's filings
         with  the  Securities  and  Exchange  Commission;   and  to  Borrower's
         knowledge,  Borrower is not in default with respect to any order, writ,
         injunction,   decree  or  demand  of  any  court  or  any  governmental
         authority.

                  (i)  Financial   Statements.   The  financial   statements  of
         Borrower,  for the fiscal year ended  December  31, 1996  contained  in
         Borrower's  Annual Report on Form 10-K for the year ended  December 31,
         1996 (the "Form 10-K") and the financial statements of Superior for the
         fiscal  year ended  December  31,  1996,  attached  hereto as  Schedule
         2.1(i)(A),  are true and  correct in all  material  respects  have been
         prepared  on the  basis of  generally  accepted  accounting  principles
         consistently  applied,  and fairly  present the financial  condition of
         Borrower as of the fiscal year then ended.  No material  adverse change
         has occurred in the financial  condition of Borrower  since the date(s)
         thereof, and no additional  borrowings have been made by Borrower since
         the date(s) thereof other than as set forth on Schedule 2.1(i)(B).

                  (j) Other Agreements; No Defaults.  Borrower is not a party to
         any indentures,  loan or credit agreements,  leases or other agreements
         or  instruments,  or subject  to any  restrictions  contained  in their
         respective articles of incorporation,  bylaws or corporate restrictions
         that could have a material adverse effect on the business,  properties,
         assets, operations or conditions,  financial or otherwise, of Borrower,
         or the ability of Borrower to carry out its obligations  under the Loan
         Documents  to which it is a party.  Borrower  is not in  default in any
         material respect in the  performance,  observance or fulfillment of any
         of the obligations,  covenants or conditions contained in any agreement
         or  instrument  material  to  its  business  to  which  it is a  party,
         including  but  not  limited  to this  Agreement  and  the  other  Loan
         Documents, and no other default or event has occurred and is continuing
         that with  notice or the  passage  of time or both would  constitute  a
         default or event of default under any of same.

                  (k)  Compliance  With Law.  Borrower has obtained all material
         licenses,   permits  and  approvals  and  authorizations  necessary  or
         required in order to conduct  its  business  and affairs as  heretofore
         conducted  and as hereafter  intended to be  conducted.  To  Borrower's
         knowledge,  Borrower  is in  compliance  with  all  laws,  regulations,
         decrees and orders applicable to it (including but not limited to laws,
         regulations, decrees and orders relating to environmental, occupational
         and health standards and controls,  antitrust,  monopoly,  restraint of
         trade or unfair competition),  except to the extent that noncompliance,
         in the  aggregate,  cannot  reasonably  be  expected to have a material
         adverse effect on its business, operations, property or




                                        7





         financial condition and will not materially adversely affect Borrower's
         financial  position or its ability to perform its obligations under the
         Loan Documents.

                  (l) Debt.  Schedule  2.1(l) is a complete  and correct list of
         all credit  agreements,  indentures,  purchase  agreements,  promissory
         notes and other evidences of indebtedness,  guaranties,  capital leases
         and other instruments,  agreements and arrangements presently in effect
         providing for or relating to extensions of credit (including agreements
         and  arrangements  for  the  issuance  of  letters  of  credit  or  for
         acceptance  financing)  in  respect  of which  Borrower,  or any of its
         properties is in any manner directly or contingently obligated; and the
         maximum  principal or face  amounts of the credit in question  that are
         outstanding and that can be outstanding are correctly  stated,  and all
         liens of any nature  given or agreed to be given as  security  therefor
         are correctly described or indicated in such Schedule.

                  (m)  Taxes.  Borrower  has filed or caused to be filed all tax
         returns that to  Borrower's  knowledge are required to be filed (except
         for returns that have been  appropriately  extended),  and has paid, or
         will pay when  due,  all  taxes  shown  to be due and  payable  on said
         returns and all other taxes,  impositions,  assessments,  fees or other
         charges  imposed  on  them by any  governmental  authority,  agency  or
         instrumentality,  prior to any delinquency  with respect thereto (other
         than taxes, impositions,  assessments, fees and charges currently being
         contested  in  good  faith  by  appropriate   proceedings,   for  which
         appropriate  amounts have been reserved).  No tax liens have been filed
         against Borrower, or any of the property thereof.

                  (n) Small Business Concern.  Borrower, taken together with its
         "affiliates"  (as that term is defined in 13 C.F.R.  ss.121.103),  is a
         "Small  Business  Concern"  within the meaning of 15 U.S.C.  ss.662(5),
         that is Section 103(5) of the Small Business Investment Act of 1958, as
         amended, and the regulations  promulgated  thereunder,  as currently in
         effect  (collectively the "SBIC Act"),  including 13 C.F.R. ss.107, and
         meets the applicable size  eligibility  criteria set forth in 13 C.F.R.
         ss.121.301(c)(1)  or the  industry  standard  covering  the industry in
         which  Borrower  is  primarily  engaged  as  set  forth  in  13  C.F.R.
         ss.121.301(c)(2).   Neither   Borrower  nor  any  of  its  Subsidiaries
         presently  engages  in  any  activities  for  which  a  small  business
         investment  company is prohibited from providing funds by the SBIC Act,
         including 13 C.F.R. ss.107.

                           On or before the closing of the Odyssey Loan, Odyssey
         shall have  received  from  Borrower SBA Forms 480 and 652,  which have
         been completed and executed by Borrower, and SBA Form 1031, Parts A and
         B of which have been completed by Borrower.






                                        8





                  (o) Certain Transactions. Except as set forth in the Form 10-K
         or  on  Schedule  2.1(o),   Borrower  is  not  indebted,   directly  or
         indirectly,  to any of its shareholders,  officers,  or directors or to
         their respective spouses or children, in any amount whatsoever; none of
         said  shareholders,  officers  or  directors  or any  members  of their
         immediate  families,  are  indebted  to  Borrower or have any direct or
         indirect  ownership  interest  in any firm or  corporation  with  which
         Borrower has a business relationship,  or any firm or corporation which
         competes  with  Borrower,  except that  shareholders,  officers  and/or
         directors of Borrower may own no more than 4.9% of outstanding stock of
         publicly traded  companies which may compete with Borrower;  no officer
         or director of Borrower or any member of their immediate families,  is,
         directly  or  indirectly,  interested  in any  material  contract  with
         Borrower. Borrower is not a guarantor or indemnitor of any indebtedness
         or other  obligation of any other person,  firm or corporation,  except
         for obligations of any Subsidiary.

                  (p) Statements Not False or Misleading.  No  representation or
         warranty  given as of the date hereof by  Borrower,  contained  in this
         Agreement or any other Loan Document,  or any schedule  attached hereto
         or thereto,  or in any statement in any document,  certificate or other
         instrument  furnished or to be furnished by Borrower to Lender pursuant
         hereto,  taken  as a  whole,  contains  or  will  (as  of the  time  so
         furnished) contain any untrue statement of a material fact, or omits or
         will (as of the time so  furnished)  omit to state  any  material  fact
         which is necessary in order to make the  statements  contained  therein
         not misleading.

                  (q)  Margin  Regulations.  Borrower  is  not  engaged  in  the
         business of extending  credit for the purpose of purchasing or carrying
         margin stock. No proceeds  received  pursuant to this Agreement will be
         used to  purchase  or carry any  equity  security  of a class  which is
         registered  pursuant to Section 12 of the  Securities  Exchange  Act of
         1934, as amended.

                  (r) Significant Contracts. Schedule 2.1(r) and the exhibits to
         the Form 10- K contain  all  material  contracts  as  required  by Item
         601(10) of  Regulation  S-K of the  Securities  Act of 1933, as amended
         (the  "Securities  Act").  Each  such  contract,  agreement  and  other
         document is in full force and effect as of the date hereof and Borrower
         knows of no reason why such  contracts,  agreements and other documents
         would  not  remain  in full  force  and  effect  pursuant  to the terms
         thereof.

                  (s)  Environment.  Borrower has duly  complied  with,  and its
         business,  operations, assets, equipment, property, leaseholds or other
         facilities are in compliance with, the provisions of all federal, state
         and local environmental, health, and safety laws, codes and ordinances,
         and all rules and  regulations  promulgated  thereunder,  except to the
         extent that failure to do so would not have a material  adverse  effect
         on its  business.  Except to the extent that failure to do so would not
         have a  material  adverse  effect on its  business,  Borrower  has been
         issued and will maintain all required federal, state and local permits,
         licenses, certificates and approvals relating to (1) air emissions; (2)
         discharges to surface water or




                                        9





         groundwater;  (3) noise emissions;  (4) solid or liquid waste disposal;
         (5) the use, generation,  storage,  transportation or disposal of toxic
         or hazardous substances or wastes (which shall include any and all such
         materials listed in any federal,  state or local law, code or ordinance
         and all rules and  regulations  promulgated  thereunder as hazardous or
         potentially  hazardous);  or (6) other environmental,  health or safety
         matters.  Borrower  has not  received  notice  of, nor does it know of,
         facts which might  constitute any  violations of any federal,  state or
         local  environmental,  health or safety laws, codes or ordinances,  and
         any rules or  regulations  promulgated  thereunder  with respect to its
         businesses,  operations,  assets, equipment,  property,  leaseholds, or
         other  facilities  except to the extent that such violations  would not
         have a material  adverse  effect on its business.  Except to the extent
         that such emission,  spill,  release or discharge would have a material
         adverse  effect on its business and except in  accordance  with a valid
         governmental permit, license,  certificate or approval,  there has been
         no emission,  spill, release or discharge into or upon (1) the air; (2)
         soils,  or any  improvements  located  thereon;  (3)  surface  water or
         groundwater;  or (4) the  sewer,  septic  system  or  waste  treatment,
         storage or disposal  system  servicing  the  premises,  of any toxic or
         hazardous substances or wastes at or from the premises; and to the best
         of Borrower's knowledge,  the premises of Borrower are free of all such
         toxic or hazardous  substances or wastes.  There has been no complaint,
         order,  directive,  claim,  citation  or  notice  by  any  governmental
         authority  or any person or entity with  respect to (1) air  emissions;
         (2) spills,  releases or  discharges to soils or  improvements  located
         thereon,  surface  water,  groundwater  or the sewer,  septic system or
         waste treatment,  storage or disposal  systems  servicing the premises;
         (3) noise emissions;  (4) solid or liquid waste disposal;  (5) the use,
         generation,  storage,  transportation or disposal of toxic or hazardous
         substances  or  waste;  or (6)  other  environmental,  health or safety
         matters  materially  affecting  Borrower or its  business,  operations,
         assets, equipment,  property, leaseholds or other facilities.  Borrower
         has no material  indebtedness,  obligation  or  liability  (absolute or
         contingent,  matured or not  matured),  with  respect  to the  storage,
         treatment, cleanup or disposal of any solid wastes, hazardous wastes or
         other toxic or hazardous  substances  (including without limitation any
         such indebtedness, obligation, or liability with respect to any current
         regulation, law or statute regarding such storage,  treatment,  cleanup
         or disposal).

                  (t)  Fees;  Commissions.  Borrower  has not  agreed to pay any
         finder's fee,  commission,  origination  fee (except for the processing
         and  commitment  fees due  pursuant to Section 1.2 and $185,000 of fees
         payable to Quaker  Capital  Corporation)  or other fee or charge to any
         person or entity with respect to the Loan and  investment  transactions
         contemplated hereunder.

                  (u) ERISA.  Borrower is in compliance in all material respects
         with all  applicable  provisions  of ERISA (as defined in Section  3.11
         hereof).  Neither a reportable  event nor a prohibited  transaction (as
         defined in ERISA) has  occurred and is  continuing  with respect to any
         Plan (as  defined  in  Section  3.11  hereof);  no  notice of intent to
         terminate  a Plan has been filed nor has any Plan been  terminated;  no
         circumstances  exist which  constitute  grounds  entitling  the Pension
         Benefit




                                       10





         Guaranty Corporation (together with any entity succeeding to any or all
         of its functions, the "PBGC") to institute proceedings to terminate, or
         appoint a trustee to administer,  a Plan,  nor has the PBGC  instituted
         any such  proceedings;  neither  Borrower nor any  commonly  controlled
         entity (as defined in ERISA) has completely or partially withdrawn from
         a multiemployer plan (as defined in ERISA);  Borrower and each commonly
         controlled entity has met its minimum funding  requirements under ERISA
         with  respect to all of its Plans and the present  fair market value of
         all Plan  property  exceeds  the present  value of all vested  benefits
         under each Plan, as determined on the most recent valuation date of the
         Plan and in accordance with the provisions of ERISA and the regulations
         thereunder for calculating  the potential  liability of Borrower or any
         commonly  controlled  entity to the PBGC or the Plan under  Title IV of
         ERISA;  and neither  Borrower  nor any commonly  controlled  entity has
         incurred any liability to the PBGC under ERISA.

                  (v) Title to Properties.  Borrower has good,  indefeasible and
         insurable  title  to, or valid  leasehold  interests  in,  all its real
         properties  and good title to its other  assets,  free and clear of all
         liens other than Permitted Liens (as defined in Section 3.15 hereof).

                  (w) Material  Adverse  Effect.  Since March 31, 1997, no event
         has occurred which has resulted or which Borrower  reasonably  believes
         could be expected to result in a material adverse effect on Borrower or
         Superior or Borrower's or Superior's ability to perform its obligations
         under the Loan  Documents.  No default  or event of  default  under any
         other agreement will occur as a result of the transactions contemplated
         by this Agreement or by the Warrants.

                  (x)  Financial  Solvency.  Borrower is not  entering  into the
         arrangements   contemplated  by  this  Agreement  and  the  other  Loan
         Documents with actual intent to hinder, delay or defraud either present
         or future creditors.  On and as of the date hereof on a pro forma basis
         after  giving  effect  to the  transactions  contemplated  by the  Loan
         Documents  and to all debts  incurred  or to be created  in  connection
         therewith:

                           (i) the present fair  salable  value of the assets of
                  Borrower  (on a going  concern  and  consolidated  basis) will
                  exceed the probable liability of Borrower to Lenders;

                           (ii) Borrower has not incurred, nor does it intend to
                  or believe  that it will incur,  debts  (including  contingent
                  obligations)  beyond  its  ability  to pay such  debts as such
                  debts  mature  (taking  into account the timing and amounts of
                  cash to be  received  from any  source,  and of  amounts to be
                  payable on or in  respect  of  debts);  and the amount of cash
                  available  to Borrower  after  taking  into  account all other
                  anticipated  uses of funds is  anticipated to be sufficient to
                  pay all such  amounts  on or in  respect  of debts,  when such
                  amounts are required to be paid; and




                                       11






                           (iii) except as disclosed in the Form 10-K,  Borrower
                  will have sufficient capital with which to conduct its present
                  and proposed  business  and the property of Borrower  does not
                  constitute  unreasonably  small  capital with which to conduct
                  its current business at present levels of operations.

                  For purposes of this Section 2.1(x) "debt" means any liability
         on a (i) right to  payment  whether  or not such a right is  reduced to
         judgment,  liquidated,   unliquidated,   fixed,  contingent,   matured,
         unmatured,   disputed,   undisputed,   legal,  equitable,  secured,  or
         unsecured;  or  (ii)  right  to  an  equitable  remedy  for  breach  of
         performance if such breach gives rise to a payment, whether or not such
         a  right  to  an  equitable  remedy  is  reduced  to  judgment,  fixed,
         contingent, unmatured, disputed, undisputed, secured, or unsecured.

                  (y) Offering of Note and Warrant.  Neither Borrower nor anyone
         acting on its behalf has offered the Notes, the Warrants or any similar
         securities  for sale to, or solicited  any offer to buy any of the same
         from, or otherwise  approached or negotiated in respect thereof,  with,
         any person other than Lenders and not more than 35 other  institutional
         investors.  Neither Borrower nor anyone acting on its behalf has taken,
         or will take,  any action  which would  subject the issuance or sale of
         the Notes,  and the Warrants to Section 5 of the  Securities Act or the
         registration  or  qualification  provisions of the blue sky laws of any
         state.

                  (z) Registration Rights.  Except as disclosed in the Form 10-K
         and Schedule  2.1(z),  Borrower is not under any obligation to register
         under  the  Securities  Act or the  Trust  Indenture  Act of  1939,  as
         amended,  any of its  presently  outstanding  securities  or any of its
         securities that may subsequently be issued.

                  (aa)  Employees.  Borrower  has no current  labor  problems or
         disputes  which have  resulted or which  Borrower  reasonably  believes
         could be expected to have a material adverse effect upon Borrower.

                  (ab)  Issuance  Taxes.   All  taxes  imposed  on  Borrower  in
         connection  with the  issuance,  sale and  delivery  of the Notes,  the
         Warrants,  and the Common Stock  issuable upon exercise of the Warrants
         have been or will be fully paid by Borrower in accordance with all laws
         imposing such taxes.

                  (ac) List of Deposit  Institutions.  Schedule  2.1(ac)  hereto
         sets forth a true and  complete  list of all  deposit  institutions  at
         which Borrower has or maintains an account or deposits of any kind.

                  (ad)  Locations and Names.  Borrower has not,  during the five
         years preceding the date of this  Agreement,  been known as or used any
         other  corporate,  trade  or  fictitious  name,  nor  acquired  all  or
         substantially  all of the assets,  capital stock or operating  units of
         any person except as described in the Form 10-K.




                                       12





         Borrower  has not,  during  the five years  preceding  the date of this
         Agreement,  had a business location at any address other than addresses
         set forth on Schedule 2.1(ad).


                                    ARTICLE 3
                            COVENANTS AND AGREEMENTS

                  Borrower  covenants  and agrees  that  during the term of this
Agreement:

         3.1  Payment  of  Obligations.  Borrower  shall  pay  the  indebtedness
evidenced by the Notes  according to the terms thereof,  and shall timely pay or
perform,  as the  case may be,  all of the  other  obligations  of  Borrower  to
Lenders, direct or contingent, however evidenced or denominated, and however and
whenever incurred,  including but not limited to indebtedness  incurred pursuant
to any  present  or future  commitment  of Lenders to  Borrower,  together  with
interest  thereon,  and any  extensions,  modifications,  consolidations  and/or
renewals thereof and any notes given in payment thereof.

         3.2 Financial Statements and Reports. Borrower shall furnish to Lenders
(a) as soon as  practicable  and in any event within  ninety (90) days after the
end of each fiscal year of Borrower, a consolidated balance sheet of Borrower as
of the close of such fiscal  year,  a  consolidated  statement  of earnings  and
retained  earnings  of  Borrower  as of the  close  of such  fiscal  year  and a
consolidated statement of cash flows for Borrower for such fiscal year, prepared
in accordance with generally accepted accounting principles consistently applied
("GAAP"), audited by an independent certified public accountant and certified by
an officer of Borrower and  accompanied  by a  certificate  of the  President of
Borrower,  stating that to the best of the knowledge of such  officer,  Borrower
has kept, observed, performed and fulfilled each covenant, term and condition of
this Agreement and the other Loan Documents during the preceding fiscal year and
that no Event of Default, as herein defined,  has occurred and is continuing (or
if an Event of Default has occurred and is continuing,  specifying the nature of
same,  the  period of  existence  of same and the action  Borrower  has taken or
proposes to take in  connection  therewith),  (b) within twenty (20) days of the
end of each calendar  month, a balance sheet of Superior as of the close of such
month and a statement of earnings  and  retained  earnings of Superior as of the
close of such month, all in reasonable detail (including  year-to-date financial
information), and prepared substantially in accordance with GAAP (except for the
absence of footnotes and subject to year-end adjustments), (c) within forty-five
(45) days of the end of each fiscal quarter,  a Form 10-Q prepared in compliance
with  applicable  securities  laws  with  respect  to  Borrower,  and  (d)  with
reasonable  promptness,  such  other  financial  data as Lender  may  reasonably
request,  including without  limitation,  the "Closing Financial  Statements" as
defined in that certain  Agreement and Plan of Merger  Agreement  dated March 7,
1997,  by and  among  Borrower,  DynaGen  Acquisition  Corp.,  Superior  and the
shareholders of Superior, as amended (the "Plan of Merger").






                                       13





         3.3  Maintenance  of Books  and  Records;  Inspection.  Borrower  shall
maintain its books,  accounts  and records in  accordance  with GAAP,  and after
reasonable notice from Lenders,  shall permit Lenders,  its officers,  employees
and any professionals  designated by Lenders in writing,  at Borrower's expense,
to visit,  inspect  and/or  audit  any of its  properties,  books and  financial
records, and to discuss its accounts,  affairs and finances with Borrower or the
principal  officers of Borrower during  reasonable  business hours,  all at such
times as Lenders may reasonably request; provided that no such visit, inspection
and/or audit shall materially interfere with the conduct of Borrower's business.

         3.4 Insurance.  Without  limiting any of the requirements of any of the
other Loan Documents,  Borrower shall maintain in amounts customary for entities
engaged in comparable business activity (a) to the extent required by applicable
law, worker's compensation insurance (or maintain a legally sufficient amount of
self  insurance  against  worker's  compensation   liabilities,   with  adequate
reserves,  under a plan approved by Lender, such approval not to be unreasonably
withheld or  delayed),  and (b) fire and "all risk"  casualty  insurance  on its
properties against such hazards and in at least such amounts as are customary in
Borrower's  business.  Borrower  will make  reasonable  efforts  to  obtain  and
maintain  public  liability  insurance  in an  amount,  and  at a  cost,  deemed
reasonable  to the  Borrower's  Board of  Directors.  At the request of Lenders,
Borrower  will deliver  forthwith a certificate  specifying  the details of such
insurance in effect.

         3.5 Taxes and Assessments.  Borrower shall (a) file all tax returns and
appropriate  schedules  thereto that are  required to be filed under  applicable
law,  prior  to the  date  of  delinquency,  (b) pay and  discharge  all  taxes,
assessments  and  governmental  charges or levies imposed upon Borrower upon its
income and profits or upon any properties  belonging to it, prior to the date on
which  penalties  attach  thereto,  and  (c)  pay  all  taxes,  assessments  and
governmental  charges or levies that,  if unpaid,  might become a lien or charge
upon any of its properties;  provided,  however, that Borrower in good faith may
contest any such tax,  assessment,  governmental charge or levy described in the
foregoing  clauses (b) and (c) so long as  appropriate  reserves are  maintained
with respect thereto.

         3.6  Corporate   Existence.   Borrower  shall  maintain  its  corporate
existence  and  good  standing  in the  state  of  its  incorporation,  and  its
qualification and good standing as a foreign corporation in each jurisdiction in
which such qualification is necessary pursuant to applicable law.

         3.7 Compliance with Law and Other Agreements.  Except where the failure
to do so would not  materially  adversely  affect  Borrower's  operations or its
ability to fulfill its  obligations  under the Loan  Documents,  Borrower  shall
maintain  its  business,  operations  and property  owned or used in  connection
therewith in compliance with (a) all applicable  federal,  state and local laws,
regulations  and ordinances  governing such business  operations and the use and
ownership  of  such  property,  and (b) all  agreements,  licenses,  franchises,
indentures  and mortgages to which  Borrower is a party or by which  Borrower or
any of its properties is bound.  Without limiting the foregoing,  Borrower shall
pay all of its indebtedness promptly in accordance with the terms thereof.




                                       14






         3.8 Notice of Default. Borrower shall give written notice to Lenders of
the  occurrence of any default,  event of default or Event of Default under this
Agreement or any other Loan Document promptly upon the occurrence thereof.

         3.9 Notice of Litigation.  Borrower shall give notice,  in writing,  to
Lenders of (a) any  actions,  suits or  proceedings  instituted  by any  persons
whomsoever against Borrower, or affecting any of the assets of Borrower, wherein
the amount at issue is in excess of One Hundred  Fifty  Thousand  and  No/100ths
Dollars ($150,000.00),  and (b) any dispute, not resolved within sixty (60) days
of  the  commencement  thereof,  between  Borrower  on  the  one  hand  and  any
governmental  regulatory body on the other hand,  which dispute might materially
interfere with the normal operations of Borrower.

         3.10 Conduct of Business, Name and Location of Business.  Borrower will
continue  to  engage  in a  business  of the same  general  type and  manner  as
conducted by it on the date of this Agreement and as proposed to be conducted in
the Form 10-K. Borrower will not change its name or any location of its business
without  providing  Lender with 10 days' written  notice of such change.  In the
event  Borrower  makes a change of its name or  location of  business,  Borrower
shall  promptly  execute any and all  financing  statements,  and  amendments or
continuations  thereof  and any other  documents  that  Lenders  may  reasonably
request to evidence, continue, and/or perfect any security interest in or pledge
of collateral securing the Loan.

         3.11 ERISA Plan. If Borrower has in effect, or hereafter institutes,  a
pension  plan that is subject to the  requirements  of Title IV of the  Employee
Retirement  Income Security Act of 1974, Pub. L. No. 93-406,  September 2, 1974,
88 Stat. 829, 29 U.S.C.A.  ss. 1001 et seq. (1975), as amended from time to time
("ERISA"),  then the following warranty and covenants shall be applicable during
such  period as any such plan (the  "Plan")  shall be in  effect:  (a)  Borrower
hereby warrants that no fact that might  constitute  grounds for the involuntary
termination of the Plan, or for the appointment by the appropriate United States
District  Court of a  trustee  to  administer  the  Plan,  exists at the time of
execution of this Agreement,  (b) Borrower hereby  covenants that throughout the
existence  of the Plan,  Borrower's  contributions  under the Plan will meet the
minimum  funding  standards  required by ERISA and Borrower will not institute a
distress  termination of the Plan, and (c) Borrower  covenants that it will send
to  Lenders a copy of any  notice of a  reportable  event (as  defined in ERISA)
required by ERISA to be filed with the Labor  Department or the Pension  Benefit
Guaranty Corporation, at the time that such notice is so filed.

         3.12 Dividends,  Distributions,  Stock Rights, etc. Except as described
on Schedule  3.12,  Borrower  shall not declare or pay any  dividend of any kind
(other than stock dividends payable to all holders of any class of capital stock
or dividends consisting of shares of Common Stock to holders of any class of the
Company's preferred stock), in cash or in property,  on any class of the capital
stock of Borrower,  or purchase,  redeem,  retire or otherwise acquire for value
any  shares  of such  stock,  nor make any  distribution  of any kind in cash or
property in respect thereof, nor make any return of capital of shareholders, nor
make any  payments in cash or property  in respect of any stock  options,  stock
bonus or




                                       15





similar  plan  (except as required or  permitted  hereunder),  without the prior
written  consent of Lenders.  Superior  shall not  distribute  to  Borrower  and
Borrower shall not receive any loans,  advances,  corporate expense allocations,
fees, distributions, dividends and/or any other payments or advances of any kind
from Superior  other than amounts that Borrower uses to make payments  under the
Notes and the promissory  notes in the aggregate  principal amount of $5,000,000
payable to the former shareholders of Superior pursuant to the Plan of Merger.

         3.13 Guaranties; Loans; Payment of Debt. Without Lenders' prior express
written  consent,  Borrower  shall not  guarantee  nor be liable in any  manner,
whether directly or indirectly,  or become contingently liable after the date of
this Agreement in connection  with the obligations or indebtedness of any person
or entity  whatsoever  (other than a Subsidiary),  except for the endorsement of
negotiable  instruments  payable to Borrower  for deposit or  collection  in the
ordinary course of business.  Without  Lenders' prior express  written  consent,
Borrower  shall not (a) make any loans,  advances or extensions of credit to any
person other than in the normal course of its business,  or (b) make any payment
on any subordinated debt.

         3.14 Debt.  Without the express prior written consent of Lenders (which
shall not be unreasonably withheld with respect to subsection 3.14(c)), Borrower
shall  not  create,  incur,  assume  or  suffer  to  exist  indebtedness  of any
description whatsoever, excluding:

                  (a)      the indebtedness evidenced by the Notes;

                  (b)      the endorsement of negotiable  instruments payable to
                           Borrower  for deposit or  collection  in the ordinary
                           course of business;

                  (c)      debts  incurred  in the  ordinary  course of business
                           (each  of  which,   individually,   does  not  exceed
                           $500,000); and

                  (d)      the indebtedness listed on Schedule 2.1(l) hereto.

         3.15 No Liens.  Borrower shall not create,  incur,  assume or suffer to
exist any lien, security interest,  security title,  mortgage,  deed of trust or
other  encumbrance  upon or with respect to any of its properties,  now owned or
hereafter  acquired,  except  the  following  permitted  liens  (the  "Permitted
Liens"):

                  (a)      liens in favor of Lenders;

                  (b)      liens for taxes or assessments or other  governmental
                           charges or levies if not yet due and payable;

                  (c)      liens in connection  with the leasing of equipment in
                           favor of the lessor of such equipment;





                                       16





                  (d)      liens in  connection  with the shares of common stock
                           of, or assets of, Able Laboratories; and

                  (e)      liens described on Schedule 2.1(l) hereto.

         3.16 Mergers, Consolidations,  Acquisitions;  Sales; Name and Location.
Without the prior written consent of Lenders,  Borrower shall not (a) be a party
to any merger,  consolidation or corporate  reorganization,  nor (b) purchase or
otherwise  acquire  all or  substantially  all of the assets or stock of, or any
partnership or joint venture interest in, any other person,  firm or entity, nor
(c) sell,  transfer,  convey,  grant a security  interest in or lease all or any
substantial  part of its assets,  nor (d) create any Subsidiaries nor convey any
of its assets to any Subsidiary.  Without ten (10) days' prior written notice to
Lender, Borrower shall not change its name or its location(s) of doing business.

         3.17  Transactions  With Affiliates.  Borrower shall not enter into any
transaction,  including,  without limitation,  the purchase, sale or exchange of
property or the  rendering of any  service,  with any  affiliate,  except in the
ordinary  course of and pursuant to the  reasonable  requirements  of Borrower's
business and upon fair and  reasonable  terms no less favorable to Borrower than
Borrower would obtain in a comparable arm's length transaction with a person not
an affiliate.  For the purposes of this Section 3.17,  "affiliate"  shall mean a
person, corporation,  partnership or other entity controlling,  controlled by or
under common control with Borrower.

         3.18  Environment.  Borrower shall be and remain in compliance with the
provisions of all federal,  state and local  environmental,  health,  and safety
laws,  codes and ordinances,  and all rules and regulations  issued  thereunder;
notify  Lenders   immediately  of  any  notice  of  a  hazardous   discharge  or
environmental  complaint  received  from any  governmental  agency  or any other
party;  notify Lenders  immediately of any hazardous discharge from or affecting
Borrower's premises; immediately contain and remove the same, in compliance with
all  applicable  laws;  promptly pay any fine or penalty  assessed in connection
therewith; permit Lenders to inspect the premises, to conduct tests thereon, and
to inspect all books,  correspondence,  and records pertaining  thereto;  and at
Lenders'  request,  and at Borrower's  expense,  provide a report of a qualified
environmental engineer, satisfactory in scope, form, and content to Lenders, and
such other and further  assurances  reasonably  satisfactory to Lenders that the
condition has been corrected.

         3.19 Fixed Charge  Covenant.  The ratio of cash flow from operations of
Superior for each of the  following  fiscal years to the aggregate of Superior's
scheduled debt service for such years shall be no less than the following:





                                       17






                          Year-End                                  Ratio
                          --------                                  -----

           December 31, 1997                                     1.25 to 1.0

           December 31, 1998                                     1.30 to 1.0

           December 31, 1999 and each year                       1.35 to 1.0
           thereafter


For purposes of this  covenant the term "cash flow from  operations"  shall mean
net income,  plus  depreciation,  plus amortization  expense,  plus the interest
portion of scheduled debt service, all determined in accordance with GAAP.

         3.20  Informational  Covenant.  Borrower  will  furnish  or cause to be
furnished  to  Odyssey   information   required  by  the  U.S.   Small  Business
Administration  ("SBA")  concerning  the  economic  impact of the Odyssey  Loan,
including but not limited to,  information  concerning  taxes paid and number of
employees.

                  Borrower will also furnish or cause to be furnished to Lenders
such other information regarding the business, affairs and condition of Borrower
as  Lenders  may from time to time  reasonably  request.  Borrower  will  permit
Odyssey and examiners of the SBA to inspect the books and any of the  properties
or assets of Borrower and its affiliates and to discuss Borrower's business with
senior  management  employees at such reasonable times as those persons may from
time  to  time  request.   Odyssey  agrees  not  to  disclose  any  confidential
information   received  from  Borrower  (except  to  its  partners  and  to  its
professional  advisors,  whom  Odyssey  shall  cause  to keep  such  information
confidential,  and to the SBA) and to use the same care with such information as
it affords to its own confidential information.

         3.21 Use of Proceeds.  Borrower will use the proceeds from the Loan for
the purposes and in the amounts set forth in  Paragraph  1.3 of this  Agreement.
Borrower  will  deliver  within  ninety  (90) days of the  closing of the Loan a
written  report,  certified as correct by  Borrower's  chief  financial  officer
verifying  the purposes and amounts for which  proceeds  from the Loan have been
disbursed, and, if the proceeds have not been fully disbursed within that ninety
(90) day period,  an additional  report also so  certified,  delivered not later
than the end of each succeeding  ninety (90) day period,  verifying the purposes
and amounts for which  proceeds  have been  disbursed.  Borrower  will supply to
Lenders such additional  information and documents as Lenders reasonably request
with  respect to use of proceeds  and will permit  Lenders to have access  (upon
reasonable  notice  and  during  business  hours)  to any  and all  records  and
information  and personnel as Lenders deem necessary to verify how proceeds have
been or are being used,  and to assure that the proceeds  have been used for the
purposes specified.






                                       18





         3.22     Activities and Proceeds.

                  (a) Neither  Borrower nor any of its affiliates will engage in
         any  activities  or use directly or  indirectly  the proceeds  from the
         Odyssey  Loan for any  purpose  for which a small  business  investment
         company is prohibited from providing  funds by the SBIC Act,  including
         13 C.F.R. ss.107.

                  (b) Borrower  will not,  without  obtaining  the prior written
         approval of Odyssey,  change  within one (1) year of the closing  under
         this Agreement,  Borrower's business activity to a business activity to
         which an SBIC is  prohibited  from  providing  funds  by the SBIC  Act.
         Borrower agrees that any such changes in its business  activity without
         such prior written consent of Odyssey will constitute a material breach
         of the  obligations  of Borrower under this Agreement and the financing
         documents for the Odyssey Loan (an "Activity Event of Default").  If an
         Activity Event of Default occurs,  Odyssey has the right to demand,  in
         writing,  immediate repayment of the securities  evidencing the Odyssey
         Loan,  together with interest on the aggregate amount invested from the
         date  of the  closing  to the  date of  repayment,  and  Borrower  will
         immediately  make such  payment  within  three (3) days of receipt of a
         demand.  The payment  remedy is in addition to any and all other rights
         and remedies against Borrower to which Odyssey may be entitled.


                                    ARTICLE 4
                              CONDITIONS TO CLOSING

         4.1 Closing of the Loan.  The obligation of Lenders to fund the Loan on
the date hereof (the "Closing Date") is subject to the fulfillment,  on or prior
to the Closing Date, of each of the following conditions:

                  (a) Borrower shall have performed and complied in all material
         respects  with  all  of  the  covenants,  agreements,  obligations  and
         conditions required by this Agreement.

                  (b) Lenders shall have  received an opinion of the  Borrower's
         counsel, Testa, Hurwitz & Thibeault,  LLP, and an opinion of Borrower's
         counsel,  Taft, Stettinus & Hollister,  dated the Closing Date, in form
         and substance satisfactory to Lenders' counsels.

                  (c)  Borrower  shall  have  delivered  to  Lenders  the  Notes
         executed by Borrower.

                  (d) Borrower  shall have  delivered to Lenders Stock  Purchase
         Warrants  executed by Borrower,  substantially  in the form of Exhibits
         B-1 and B-2  which  are  attached  hereto  and  incorporated  herein by
         reference,  together with related Warrant Valuation Letters executed by
         Borrower, each in a form acceptable to Lenders.





                                       19





                  (e) Borrower  shall have  delivered to Lenders Stock  Purchase
         Warrants  executed by Superior,  substantially  in the form of Exhibits
         C-1 and C-2  which  are  attached  hereto  and  incorporated  herein by
         reference.

                  (f)  Borrower  shall  have  delivered  to  Lenders a  Security
         Agreement  executed by Borrower  (in form  acceptable  to Lenders)  and
         related UCC-1  Financing  Statement(s)  (in form acceptable to Lenders)
         executed by Borrower.

                  (g)  Borrower  shall  have  delivered  to  Lenders a  Security
         Agreement  executed by Superior (in a form  acceptable  to Lenders) and
         related UCC-1  Financing  Statement(s)  (in form acceptable to Lenders)
         executed by Superior.

                  (h)  Borrower  shall  have  delivered  to Lenders a Pledge and
         Security  Agreement (in a form acceptable to Lenders) and related stock
         proxy and stock power (all in form acceptable to Lenders),  executed by
         Borrower  and  related  stock  pledge  letter  (in form  acceptable  to
         Lenders) executed by Superior.  Borrower shall have delivered the stock
         certificates that are described in the Pledge and Security Agreement to
         the  agent  for the  former  shareholders  of  Superior  to be held for
         Lenders' benefit.

                  (i)  Borrower  shall  have  delivered  to  Lenders  Landlord's
         Consents  and  Subordination  of  Lien,   executed  by  Borrower's  and
         Superior's  landlords,  in a form acceptable to Lenders with respect to
         Borrower's   and   Superior's   leasehold   interests   at   Cambridge,
         Massachusetts and Cincinnati, Ohio, respectively.

                  (j) Lenders shall have received  copies of the  certificate of
         incorporation  and other  publicly  filed  organizational  documents of
         Borrower and  Superior,  certified  by the  Secretary of State or other
         appropriate  public official in the  jurisdiction in which Borrower and
         Superior are incorporated.

                  (k) Lenders shall have  received  certified (as of the date of
         this  Agreement)  copies of all corporate  action taken by Borrower and
         Superior, including resolutions of the Board of Directors,  authorizing
         the execution, delivery and performance of the Loan Documents.

                  (l) Lenders shall have received a certificate  as to the legal
         existence  and good  standing of Borrower and  Superior,  issued by the
         Secretary  of  State  or  other  appropriate  public  official  in  the
         jurisdiction in which Borrower and Superior are incorporated.

                  (m)  Lenders   shall  have   received   certificates   of  the
         Secretaries  of State  or  other  appropriate  public  officials  as to
         Borrower's  and  Superior's  qualification  to  do  business  and  good
         standing  in each  jurisdiction  in which a failure to be so  qualified
         would  have  a  material  adverse  effect  on its  or  their  financial
         positions or its or their  ability to conduct its or their  business in
         the manner now conducted and as hereafter intended to be conducted.





                                       20





                  (n) Borrower  shall have  delivered  to Lenders  Authorization
         Agreements for Pre-Authorized Payments (Debit) executed by Borrower, in
         form acceptable to Lenders.

                  (o) Borrower, Superior, Lenders and Huntington Bank shall have
         executed an Intercreditor  Agreement in form and content  acceptable to
         Lenders.

                  (p)  Borrower  shall  have  delivered  to  Odyssey  the  Small
         Business  Administration  Forms  480,  652  and  1031  (Parts  A and B)
         completed by Borrower.

                  (q) Borrower  shall have delivered to Odyssey a Small Business
         Administration  Economic Impact Assessment completed by Borrower,  in a
         form acceptable to Odyssey.

                  (r) Borrower shall have  delivered to Lenders a  Subordination
         Agreement  executed  by  the  former  shareholders  of  Superior,   and
         acknowledged by Borrower, in form acceptable to Lenders.

                  (s)  Borrower  shall  have  delivered  to  Lender  a  Guaranty
         Agreement executed by Superior, in form acceptable to Lenders.

                  (t)  Borrower  shall have  delivered  to Lenders a  Collateral
         Assignment of Note executed by Borrower, together with the originals of
         the related promissory notes, all in form acceptable to Lenders.


                                    ARTICLE 5
                              DEFAULT AND REMEDIES

         5.1 Events of Default.  The  occurrence of any of the  following  shall
constitute an Event of Default hereunder:

                  (a) Default by Borrower in the payment of the  principal of or
         interest  on  the  indebtedness  evidenced  by  any  of  the  Notes  in
         accordance  with the terms of the  Notes,  which  default  is not cured
         within five (5) business days;

                  (b)  Any  misrepresentation  by  Borrower  as to any  material
         matter hereunder or under any of the other Loan Documents,  or delivery
         by   Borrower  of  any   schedule,   statement,   resolution,   report,
         certificate,  notice  or  writing  to  Lenders  that is  untrue  in any
         material  respect  on the date as of which the facts set forth  therein
         are stated or certified;

                  (c) Failure of  Borrower,  any  Subsidiary,  any  guarantor of
         Borrower,  or  any  shareholder  of  Borrower  to  perform  any  of its
         obligations,  covenants or agreements under this Agreement,  any of the
         Notes, or any of the other Loan Documents;






                                       21





                  (d) Borrower (i) shall generally not pay or shall be unable to
         pay  its  debts  as such  debts  become  due;  or  (ii)  shall  make an
         assignment  for the  benefit of  creditors  or petition or apply to any
         tribunal for the appointment of a custodian, receiver or trustee for it
         or a  substantial  part of its  assets;  or (iii)  shall  commence  any
         proceeding   under   any   bankruptcy,   reorganization,   arrangement,
         readjustment of debt,  dissolution or liquidation law or statute of any
         jurisdiction,  whether now or hereafter  in effect;  or (iv) shall have
         had any such  petition  or  application  filed  or any such  proceeding
         commenced  against  it in which an order for  relief is  entered  or an
         adjudication or appointment is made; or (v) shall indicate,  by any act
         or intentional and purposeful omission,  its consent to, approval of or
         acquiescence in any such petition, application, proceeding or order for
         relief or the appointment of a custodian, receiver or trustee for it or
         a  substantial  part of its  assets;  or (vi)  shall  suffer  any  such
         custodianship, receivership or trusteeship to continue undischarged for
         a period of sixty (60) days or more;

                  (e) Borrower  shall be liquidated,  dissolved,  partitioned or
         terminated, or the certificate of incorporation thereof shall expire or
         be revoked;

                  (f) A default or event of default shall occur under any of the
         other Loan Documents  and, if subject to a cure right,  such default or
         event of default shall not be cured within the applicable cure period;

                  (g)  Borrower   shall   default  in  the  timely   payment  or
         performance  of any  obligation  now or  hereafter  owed to  Lenders in
         connection  with any other  indebtedness  of Borrower  now or hereafter
         owed to Lenders;

                  (h)  Borrower  shall  have  defaulted  and  continue  to be in
         default in the timely payment or performance of any other  indebtedness
         or obligation,  which in the aggregate exceeds Twenty-Five Thousand and
         No/100ths   Dollars   ($25,000.00)  or  materially   adversely  affects
         Borrower's financial condition.

     With  respect  to any Event of Default  described  above that is capable of
being cured and that does not already provide its own cure procedure (a "Curable
Default"),  the occurrence of such Curable Default shall not constitute an Event
of Default  hereunder  if such Curable  Default is fully cured and/or  corrected
within thirty (30) days (ten (10) days, if such Curable  Default may be cured by
payment of a sum of money) of notice  thereof to  Borrower  given in  accordance
with the provisions  hereof;  provided,  however,  that this provision shall not
require  notice to Borrower and an  opportunity  to cure any Curable  Default of
which  Borrower has had actual  knowledge for the  requisite  number of days set
forth.

         5.2  Acceleration  of Maturity;  Remedies.  Upon the  occurrence of any
Event of Default described in subsection 5.1(d),  the indebtedness  evidenced by
the Notes as well as any and all other indebtedness of Borrower to Lenders shall
be  immediately  due and payable in full;  and upon the  occurrence of any other
Event of Default  described  above,  Lenders at any time thereafter may at their
option  accelerate  the maturity of the  indebtedness  evidenced by the Notes as
well as any and all other  indebtedness  of  Borrower  to  Lenders;  all without
notice of




                                       22





any kind. Upon the occurrence of any such Event of Default and the  acceleration
of the maturity of the indebtedness evidenced by the Notes:

                  (a) Lenders shall be immediately  entitled to exercise any and
         all rights and remedies  possessed by Lenders  pursuant to the terms of
         the Notes and all of the other Loan Documents; and

                  (b) Lenders  shall have any and all other  rights and remedies
         that  Lenders  may now or  hereafter  possess  at law,  in equity or by
         statute.

         5.3 Remedies Cumulative; No Waiver. No right, power or remedy conferred
upon or reserved to Lenders by this Agreement or any of the other Loan Documents
is intended to be exclusive of any other  right,  power or remedy,  but each and
every such right,  power and remedy shall be cumulative and concurrent and shall
be in addition to any other right,  power and remedy given hereunder,  under any
of the other Loan Documents or now or hereafter existing at law, in equity or by
statute.  No delay or omission by Lenders to exercise any right, power or remedy
accruing upon the occurrence of any Event of Default shall exhaust or impair any
such  right,  power or remedy or shall be  construed  to be a waiver of any such
Event of Default or an acquiescence  therein,  and every right, power and remedy
given by this Agreement and the other Loan Documents to Lenders may be exercised
from time to time and as often as may be deemed expedient by Lenders.

         5.4  Proceeds  of  Remedies.  Any or all  proceeds  resulting  from the
exercise of any or all of the foregoing  remedies  shall be applied as set forth
in the Loan Document(s)  providing the remedy or remedies exercised;  if none is
specified, or if the remedy is provided by this Agreement, then as follows:

                  First,   to  the  costs  and  expenses,   including,   without
         limitation,   reasonable   attorney's   fees  incurred  by  Lenders  in
         connection with the exercise of its remedies;

                  Second,  to the  expenses  of  curing  the  default  that  has
         occurred, in the event that Lenders elect, in their sole discretion, to
         cure the default that has occurred;

                  Third, to the payment of the obligations of Borrower under the
         Loan  Documents (the  "Obligations"),  including but not limited to the
         payment of the principal of and interest on the indebtedness  evidenced
         by the Notes,  in such order of priority as Lenders shall  determine in
         its sole discretion; and

                  Fourth,  the  remainder,  if any,  to Borrower or to any other
         person lawfully thereunto entitled.





                                       23






                                    ARTICLE 6
                                   TERMINATION

         6.1 Termination of this Agreement.  This Agreement shall remain in full
force and effect until the payment by Borrower of all amounts owed to Lenders on
the Notes at which time Lenders shall cancel the Notes and deliver such Notes to
Borrower.


                                    ARTICLE 7
                                  MISCELLANEOUS

         7.1  Performance By Lenders.  If Borrower shall default in the payment,
performance or observance of any covenant,  term or condition of this Agreement,
which default is not cured within the applicable cure period,  then Lenders may,
at Lender's  option,  pay, perform or observe the same, and all payments made or
costs or expenses incurred by Lenders in connection therewith (including but not
limited to reasonable  attorney's  fees),  with interest  thereon at the highest
default rate provided in the Notes (if none,  then at the maximum rate from time
to time allowed by applicable  law),  shall be immediately  repaid to Lenders by
Borrower and shall  constitute a part of the  Obligations.  Lenders shall be the
sole judge of the necessity for any such actions and of the amounts to be paid.

         7.2  Successors  and  Assigns  Included  in  Parties.  Whenever in this
Agreement  one of the parties  hereto is named or referred to, the heirs,  legal
representatives,  successors,  successors-in-title  and assigns of such  parties
shall be included,  and all covenants and agreements contained in this Agreement
by or on behalf of Borrower  or by or on behalf of Lenders  shall bind and inure
to   the   benefit   of   their   respective   heirs,   legal   representatives,
successors-in-title and assigns, whether so expressed or not.

         7.3 Costs and Expenses. Borrower agrees to pay all reasonable costs and
expenses  incurred  by  Lenders  in  connection  with the  making  of the  Loan,
including but not limited to filing fees,  recording taxes,  indebtedness taxes,
and  reasonable  attorneys'  fees,  promptly  upon demand of  Lenders.  Borrower
further  agrees to pay all premiums for  insurance  required to be maintained by
Borrower   pursuant  to  the  terms  of  the  Loan  Documents  and  all  of  the
out-of-pocket  costs and  expenses  incurred by Lenders in  connection  with the
collection of the Loan,  amendment to the Loan  Documents,  or prepayment of the
Loan,  including but not limited to reasonable  attorneys'  fees,  promptly upon
demand of Lenders.

         7.4 Assignment.  The Notes, this Agreement and the other Loan Documents
may be endorsed, assigned and/or transferred in whole or in part by Lenders, and
any such holder and/or assignee of the same shall succeed to and be possessed of
the rights and powers of Lenders under all of the same to the extent transferred
and  assigned.  Lenders  may grant  participations  in all or any portion of its
interest in the  indebtedness  evidenced by the Notes and in such event Borrower
shall  continue to make  payments  due under the Loan  Documents  to Lenders and
Lenders shall have the sole  responsibility  of allocating and  forwarding  such
payments in the appropriate manner and amounts. Borrower shall not assign any of
its rights




                                       24





nor  delegate  any of its  duties  hereunder  or  under  any of the  other  Loan
Documents without the prior express written consent of Lenders.

         7.5 Time of the  Essence.  Time is of the essence  with respect to each
and every covenant, agreement and obligation of Borrower hereunder and under all
of the other Loan Documents.

         7.6  Severability.  If  any  provision(s)  of  this  Agreement  or  the
application   thereof  to  any  person  or  circumstance  shall  be  invalid  or
unenforceable to any extent, the remainder of this Agreement and the application
of such  provisions  to other  persons or  circumstances  shall not be  affected
thereby and shall be enforced to the greatest extent permitted by law.

         7.7  Interest and Loan  Charges Not to Exceed  Maximum  Allowed by Law.
Anything in this Agreement, the Notes, or any of the other Loan Documents to the
contrary  notwithstanding,   in  no  event  whatsoever,  whether  by  reason  of
advancement of proceeds of the Loan,  acceleration of the maturity of the unpaid
balance of the Loan or otherwise,  shall the interest and loan charges agreed to
be paid to Lenders for the use of the money advanced or to be advanced hereunder
exceed the maximum amounts collectible under applicable laws in effect from time
to time.  It is  understood  and agreed by the parties  that,  if for any reason
whatsoever  the  interest  or  loan  charges  paid or  contracted  to be paid by
Borrower in respect of the indebtedness  evidenced by the Notes shall exceed the
maximum amounts  collectible  under applicable laws in effect from time to time,
then ipso facto,  the obligation to pay such interest  and/or loan charges shall
be reduced to the maximum amounts  collectible  under  applicable laws in effect
from time to time, and any amounts collected by Lenders that exceed such maximum
amounts  shall be  applied  by such  Lender to the  reduction  of the  principal
balance of the  indebtedness  evidenced by the Notes held by such Lender  and/or
refunded to Borrower, at the option of such Lender, so that at no time shall the
interest  or loan  charges  paid  or  payable  in  respect  of the  indebtedness
evidenced by the Notes exceed the maximum amounts permitted from time to time by
applicable law.

         7.8 Article and Section  Headings;  Defined Terms.  Numbered and titled
article and section  headings  and defined  terms are for  convenience  only and
shall not be construed as amplifying  or limiting any of the  provisions of this
Agreement.

         7.9  Notices.  Any and all notices,  elections or demands  permitted or
required to be made under this Agreement or any of the Loan  Documents  shall be
in writing, signed by the party giving such notice, election or demand and shall
be delivered personally, telecopied, or sent overnight via nationally recognized
courier service (such as Federal Express), to the other party at the address set
forth below, or at such other address as may be supplied in writing and of which
receipt  has  been  acknowledged  in  writing.  The date of  personal  delivery,
telecopy  or telex or the next  business  day  after  delivery  to such  courier
service,  as the case may be,  shall be the  date of such  notice,  election  or
demand. For the purposes of this Agreement:





                                       25





The Address of Sirrom is:               Sirrom Capital Corporation
                                        Suite 200
                                        500 Church Street
                                        Nashville, TN 37219
                                        Attention:  Brent Ray
                                        Telecopy:  615/726-1208

with a copy to:                         Chambliss, Bahner & Stophel, P.C.
                                        1000 Tallan Building
                                        Two Union Square
                                        Chattanooga, TN 37402
                                        Attention:  J. Patrick Murphy, Esq.
                                        Telecopy:  423/265-9574

The Address of Odyssey is:              Odyssey Investment Partners, L.P.
                                        950 West Valley Road
                                        Suite 2902
                                        Wayne, PA 19087
                                        Attention:  Kirk Griswold
                                        Telecopy:  610/964-9524

The Address of Borrower and
Subsidiary is:                          DynaGen, Inc. or Superior Pharmaceutical
                                        Company
                                        99 Erie Street
                                        Cambridge, Massachusetts 02139
                                        Attention: President
                                        Telecopy: 617/354-3902

with a copy to:                         Testa, Hurwitz & Thibeault, LLP
                                        High Street Tower
                                        125 High Street
                                        Boston, Massachusetts 02110
                                        Attention:  John Hession, Esq.
                                        Telecopy:  617/248-7100

                                        The Huntington National Bank
                                        105 West 4th Street, Suite 400
                                        Cincinnati, Ohio 45202
                                        Attention: Gene Fugate
                                        Telecopy: 513/762-1873

         7.10 Entire Agreement.  This Agreement and the other written agreements
between Borrower and Lender  represent the entire agreement  between the parties
concerning  the  subject  matter  hereof,  and all oral  discussions  and  prior
agreements  are merged  herein;  provided,  if there is a conflict  between this
Agreement and any other document executed




                                       26





contemporaneously  herewith  with respect to the  Obligations,  the provision of
this Agreement  shall control.  The execution and delivery of this Agreement and
the  other  Loan  Documents  by the  Borrower  were not  based  upon any fact or
material provided by Lender, nor was the Borrower induced or influenced to enter
into  this  Agreement  or  the  other  Loan  Documents  by  any  representation,
statement, analysis or promise by Lender.

         7.11 Governing Law and  Amendments.  This Agreement and all of the Loan
Documents  shall be  construed  and  enforced  under  the  laws of the  State of
Tennessee applicable to contracts to be wholly performed in such State except to
the extent certain rights and privileges may be granted Lender under  applicable
federal  laws in  which  event  federal  law  shall  control.  No  amendment  or
modification  hereof shall be effective  except in a writing executed by each of
the parties hereto.

         7.12  Survival  of  Representations  and  Warranties.   All  covenants,
representations and warranties contained herein or in any of the Loan Documents,
or made by or furnished on behalf of the Borrower in connection  herewith or any
of the  Loan  Documents,  shall  survive  the  execution  and  delivery  of this
Agreement  and all other Loan  Documents  and shall  continue  in full force and
effect so long as the Obligations are unpaid.

         7.13   Jurisdiction   and  Venue.   BORROWER  HEREBY  CONSENTS  TO  THE
JURISDICTION  OF THE  COURTS OF THE STATE OF  TENNESSEE  AND THE  UNITED  STATES
DISTRICT  COURT  FOR  THE  MIDDLE  DISTRICT  OF  TENNESSEE,  AS  WELL  AS TO THE
JURISDICTION  OF ALL COURTS FROM WHICH AN APPEAL MAY BE TAKEN FROM SUCH  COURTS,
FOR THE PURPOSE OF ANY SUIT,  ACTION OR OTHER  PROCEEDING  ARISING OUT OF ANY OF
ITS OBLIGATIONS ARISING UNDER THIS AGREEMENT OR ANY OTHER LOAN DOCUMENTS OR WITH
RESPECT TO THE TRANSACTIONS  CONTEMPLATED  HEREBY,  AND EXPRESSLY WAIVES ANY AND
ALL  OBJECTIONS  IT MAY HAVE AS TO VENUE OR FORUM NON  CONVENIENS IN ANY OF SUCH
COURTS.

         7.14 Waiver of Trial by Jury. LENDER AND BORROWER HEREBY WAIVE TRIAL BY
JURY IN ANY ACTIONS, PROCEEDINGS, CLAIMS OR COUNTER-CLAIMS,  WHETHER IN CONTRACT
OR TORT,  AT LAW OR IN EQUITY,  ARISING  OUT OF OR IN ANY WAY  RELATING  TO THIS
AGREEMENT OR ANY OTHER LOAN DOCUMENTS.

         7.15  Counterparts.  This  Agreement  may be  executed in any number of
counterparts   and  by   different   parties  to  this   Agreement  in  separate
counterparts,  each of which when so executed  shall be deemed to be an original
and all of which taken together shall constitute one and the same Agreement.

         7.16  Construction  and  Interpretation.  Should any  provision of this
Agreement  require  judicial  interpretation,  the parties hereto agree that the
court interpreting or construing the same shall not apply a presumption that the
terms hereof shall be more strictly construed against one party by reason of the
rule of construction that a document is to be more strictly




                                       27





construed  against the party that itself or through its agent prepared the same,
it being  agreed  that the  Borrower,  Lenders and their  respective  agents and
attorneys have participated in the preparation hereof.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement, or
have caused this Agreement to be executed by their duly authorized officers,  as
of the day and year first above written.

                                    LENDERS:

                                    SIRROM CAPITAL CORPORATION, a Tennessee
                                    corporation


                                    By:    /s/ [Illegible]
                                          -----------------------------------
                                    Title: Vice President
                                          -----------------------------------

                                    ODYSSEY INVESTMENT PARTNERS, L.P., a
                                    Pennsylvania limited partnership

                                    By:  ODYSSEY ASSOCIATES, L.P., its General
                                    Partner

                                    By:  ODYSSEY ASSOCIATES, INC., its General
                                    Partner



                                    By:    /s/ [Illegible]
                                          -----------------------------------
                                    Title: President
                                          -----------------------------------

                                    BORROWER:

                                    DYNAGEN, INC., a Delaware corporation


                                    By:    /s/ Dhananjay G. Wadekar
                                          -----------------------------------
                                    Title: Executive Vice President
                                          -----------------------------------






                                       28


                       INDEX OF SCHEDULES AND ATTACHMENTS
                       ----------------------------------




Exhibit A-1 - Form of Sirrom Note
Exhibit A-2 - Form of Odyssey Note
Exhibit B -Form of  Borrower  Warrants  
Exhibit C - Form of  Subsidiary  Warrants
Schedule 2.1(b) - Subsidiaries 
Schedule 2.1(c) - Authorization
Schedule 2.1(e) - Options,  Warrants,  Stock  Rights,  Etc.
Schedule  2.1(f) - Trademarks,  Patents,  Etc.
Schedule 2.1(h) - Litigation
Schedule 2.1(i)(A) and (B) - Financial  Statements
Schedule  2.1(l) - Debt and Liens
Schedule 2.1(o) - Shareholder  Loans
Schedule 2.1(r) - Significant  Contracts
Schedule  2.1(ac) - Deposit  Institutions
Schedule  2.1(ad) - Names and  Locations
Schedule 3.12 - Distributions to Shareholders



THIS AGREEMENT IS SUBJECT TO THE TERMS OF THAT CERTAIN  INTERCREDITOR  AGREEMENT
OF EVEN DATE HEREWITH BY AND AMONG THE PARTIES HERETO, CO-LENDER, THE HUNTINGTON
NATIONAL BANK AND SUPERIOR PHARMACEUTICAL COMPANY.


                               SECURITY AGREEMENT
                                   (Borrower)


         THIS  SECURITY  AGREEMENT  ("Agreement"),  dated as of  the 18th day of
June,  1997, is made and entered into by and between  DYNAGEN,  INC., a Delaware
corporation   ("Borrower"),   and  SIRROM  CAPITAL   CORPORATION,   a  Tennessee
corporation ("Lender"), for itself and as agent for ODYSSEY INVESTMENT PARTNERS,
L.P., a Pennsylvania limited partnership ("Co-Lender").

                                   WITNESSETH:

         WHEREAS,  Lender and Co-Lender  have agreed to make a loan (the "Loan")
in the aggregate amount of $3,000,000 to Borrower, pursuant to that certain Loan
Agreement of even date  herewith by and between  Borrower,  Lender and Co-Lender
(the "Loan Agreement"); and

         WHEREAS,  in connection with the making of the Loan,  Lender desires to
obtain from Borrower and Borrower desires to grant to Lender,  for itself and as
agent  for  Co-  Lender,  a  security   interest  in  certain   collateral  more
particularly described below.

                                   AGREEMENT:

         NOW,  THEREFORE,  in consideration of the foregoing  premises and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1. Grant of Security  Interest.  Borrower hereby grants to Lender,  for
itself  and as  agent  for  Co-Lender,  a  security  interest  in the  following
described  property  and any and all  proceeds  (although  proceeds are covered,
Lender does not authorize the sale of any of the following, except to the extent
permitted  under Sections 10 and 11 hereof) and products  thereof and accessions
thereto (collectively, the "Collateral"):

                  (a)  Equipment.  All  equipment  and other  tangible  personal
         property of Borrower of any kind and description,  whether now owned or
         hereafter  acquired  and  wherever  located,  together  with all parts,
         accessories and attachments and all replacements  thereof and additions
         thereto;








                  (b)  Inventory,  Accounts,  Contract  Rights,  Chattel  Paper,
         Documents,  Instruments  and  General  Intangibles.  All of  Borrower's
         inventory and any agreements  for lease of same and rentals  therefrom,
         and all of Borrower's accounts,  accounts receivable,  contract rights,
         chattel paper, software, documents, instruments and general intangibles
         (including goodwill, but excluding patents, trademarks,  copyrights and
         other intellectual property) and the proceeds therefrom, whether now in
         existence  or owned or hereafter  arising or acquired,  entered into or
         created,  and wherever located;  and whether held for lease or sale, or
         furnished or to be furnished under contracts of service.

                  The term "Collateral"  shall not include the shares of capital
stock of any Subsidiary (as defined in the Loan Agreement)  owned by Borrower or
any assets of such Subsidiaries.

         2. Secured  Indebtedness.  The obligations secured hereby shall include
(a) loans to be made  concurrently  or in connection  with this Agreement or the
Loan Agreement as evidenced by one or more promissory notes payable to the order
of Lender  and/or Co- Lender  that shall be due and payable as set forth in such
promissory  notes,  and any  renewals or  extensions  thereof,  (b) the full and
prompt  payment  and  performance  of any and all other  indebtedness  and other
obligations  of  Borrower  to Lender  and/or  Co-Lender,  direct  or  contingent
(including  but not limited to  obligations  incurred as indorser,  guarantor or
surety),  however evidenced or denominated,  and however and whenever  incurred,
including but not limited to  indebtedness  incurred  pursuant to any present or
future  commitment of Lender and/or Co-Lender to Borrower and any and all future
advances  regardless  of the class of such future  advances,  and (c) all future
advances  made by Lender  and/or  Co-Lender  for taxes,  levies,  insurance  and
preservation of the Collateral and all attorney's fees, court costs and expenses
of whatever kind incident to the collection of any of said indebtedness or other
obligations and the enforcement and protection of the security  interest created
hereby.

         3.  Representations,  Warranties and  Agreements of Borrower.  Borrower
represents, warrants and agrees as follows:

                  (a) Borrower will promptly notify Lender,  in writing,  of any
         change in Borrower's  place or places of business if the  Collateral is
         used in  business,  or of any  change in  Borrower's  residence  if the
         Collateral  is not used in  business,  and  regardless  of use,  of any
         change in the  location of the  Collateral  or any  records  pertaining
         thereto.

                  (b)  Except  as set  forth  on  Schedule  2.1(l)  of the  Loan
         Agreement,  Borrower is the owner of the  Collateral  free and clear of
         any liens, security interests,  claims and encumbrances,  contingent or
         otherwise.  Borrower will defend the Collateral  against the claims and
         demands of all persons.






                                        2





                  (c) Borrower will pay to Lender and Co-Lender, amounts secured
         hereby  as and when  the same  shall  be due and  payable,  whether  at
         maturity,  by acceleration or otherwise,  and will promptly perform all
         terms of said  indebtedness  and  this or any  other  security  or loan
         agreement between Borrower,  Lender and/or Co-Lender, and will promptly
         discharge all said liabilities.

                  (d)  Borrower  will at all times keep the  Collateral  insured
         against all  insurable  hazards in amounts equal to the full cash value
         of the Collateral. Such insurance shall be obtained from such companies
         as may be acceptable to Lender, with provisions  satisfactory to Lender
         for payment of all losses  thereunder  to Lender as its  interests  may
         appear. If required by Lender, Borrower shall deposit the policies with
         Lender  unless the  possession  of such  policy is required by a senior
         lender,  in which case  Borrower  shall  deposit  copies  thereof  with
         Lender.  If an Event of Default (as defined in the Loan  Agreement) has
         occurred  and is  continuing,  any money  received by Lender under said
         policies  may be applied to the  payment  of any  indebtedness  secured
         hereby,  whether or not due and payable,  otherwise said money shall be
         delivered  by  Lender to  Borrower  for the  purpose  of  repairing  or
         restoring  the  Collateral.  Borrower  assigns  to Lender  all right to
         receive proceeds of insurance not exceeding the amounts secured hereby,
         directs  any  insurer  to pay all  proceeds  directly  to  Lender,  and
         appoints  Lender  Borrower's  attorney  in fact to endorse any draft or
         check made payable to Borrower in order to collect the benefits of such
         insurance. If Borrower fails to keep the Collateral insured as required
         by Lender,  Lender  shall have the right to obtain  such  insurance  at
         Borrower's  expense  and add the  cost  thereof  to the  other  amounts
         secured hereby.

                  (e)  Borrower  will pay all  costs  of  filing  of  financing,
         continuation  and  termination  statements with respect to the security
         interests  created  hereby,  and Lender is  authorized to do all things
         that it deems  necessary  to perfect  and  continue  perfection  of the
         security interests created hereby and to protect the Collateral.

                  (f) The address set forth after  Borrower's  signature on this
         Agreement is  Borrower's  principal  place of business and the location
         where the records concerning all intangible  Collateral are kept and/or
         maintained.  The  addresses  set forth on Schedule  2.1(ad) of the Loan
         Agreement are all of the locations where Borrower does business and the
         locations of all tangible Collateral.

         4.  Default.  Borrower  shall be in default upon the  occurrence  of an
Event of Default under the Loan Agreement.

         5. Remedies Upon  Default.  Upon the  occurrence of an Event of Default
(as defined in the Loan  Agreement),  all sums secured hereby shall  immediately
become due and payable at Lender's option without notice to Borrower, and Lender
may proceed to enforce  payment of same and to  exercise  any and all rights and
remedies provided by the Uniform Commercial Code (Tennessee) or other applicable
law, as well as all other rights and remedies  possessed by Lender, all of which
shall be cumulative. Upon the occurrence of an




                                        3





Event of  Default  and upon  demand  by  Lender,  Borrower  shall  assemble  the
Collateral and make it available to Lender at a place  reasonably  convenient to
Lender and Borrower.  Any notice of sale, lease or other intended disposition of
the Collateral by Lender sent to Borrower at the address  hereinafter set forth,
or at such other  address of Borrower as may be shown on  Lender's  records,  at
least five (5) business days prior to such action,  shall constitute  reasonable
notice to Borrower.

         Lender may waive any default before or after the same has been declared
without  impairing  its right to declare a subsequent  default  hereunder,  this
right being a continuing one.

         6.  Severability.  If any provision of this  Agreement is held invalid,
such invalidity shall not affect the validity or enforceability of the remaining
provisions of this Agreement.

         7.  Binding  Effect.  This  Agreement  shall  inure to the  benefit  of
Lender's  and Co-  Lender's  successors  and assigns  and shall bind  Borrower's
heirs, representatives,  successors and assigns. If Borrower is composed of more
than one person, firm and/or entity, their obligations  hereunder shall be joint
and several.

         8. Termination  Statement.  Borrower agrees that,  notwithstanding  the
payment in full of all  indebtedness  secured hereby and whether or not there is
any  outstanding  obligation  of Lender and  Co-Lender to make future  advances,
Lender  shall not be  required to send  Borrower a  termination  statement  with
respect  to  any  financing   statement  filed  to  perfect  Lender's   security
interest(s) in any of the Collateral,  unless and until Borrower shall have made
written demand  therefor.  Upon receipt of proper written demand,  Lender may at
its option, in lieu of sending a termination  statement to Borrower,  cause said
termination statement to be filed with the appropriate filing officer(s).

         9. Protection of Collateral.  Except for Permitted Liens (as defined in
the Loan  Agreement),  Borrower will not permit any liens or security  interests
other than those created by this  Agreement to attach to any of the  Collateral,
nor permit any of the Collateral to be levied upon under any legal process,  nor
permit anything to be done that may impair the security  intended to be afforded
by this Agreement,  nor permit any tangible  Collateral to become attached to or
commingled with other goods without the prior written consent of Lender.

         10. Special  Agreements  With Respect to Certain  Tangible  Collateral.
Borrower additionally agrees and warrants as follows:

                  (a)  Borrower  will not  permit  any of the  Collateral  to be
         removed  from the  location  specified  herein,  except  for  temporary
         periods in the normal and  customary  use  thereof,  without  the prior
         written  consent  of Lender,  and will  permit  Lender to  inspect  the
         Collateral during business hours upon reasonable prior notice.





                                        4





                  (b) If any of the  Collateral  is equipment or goods of a type
         normally used in more than one state (whether or not actually so used),
         Borrower will  contemporaneously  herewith furnish Lender a list of the
         states  wherein  such  equipment  or  goods  are or will be  used,  and
         hereafter  will  notify  Lender in writing  (i) of any other  states in
         which such  equipment  or goods are so used,  and (ii) of any change in
         the location of Borrower's principal place of business.

                  (c)  Borrower  will not  sell,  exchange,  lease or  otherwise
         dispose of any of the Collateral or any interest therein (except in the
         ordinary  course of conduct of its business)  without the prior written
         consent of Lender.

                  (d) Borrower will keep the  Collateral  in good  condition and
         repair  and  will  pay  and  discharge  all  taxes,  levies  and  other
         impositions  levied  thereon  as well  as the  cost  of  repairs  to or
         maintenance of same,  and will not permit  anything to be done that may
         impair the value of any of the  Collateral.  If  Borrower  fails to pay
         such sums,  Lender may do so for Borrower's  account and add the amount
         thereof to the other amounts secured hereby.

                  (e) Until default in any of the terms hereof,  or the terms of
         any  indebtedness  secured  hereby,   Borrower  shall  be  entitled  to
         possession of the  Collateral and to use the same in any lawful manner,
         provided  that such use does not cause  excessive  wear and tear to the
         Collateral,  cause it to  decline  in value at an  excessive  rate,  or
         violate the terms of any policy of insurance thereon.

                  (f) Borrower  will not allow the  Collateral to be attached to
         real estate in such manner as to become a fixture or a part of any real
         estate.

         11. Special  Agreements With Respect to Intangible and Certain Tangible
Collateral. Borrower additionally warrants and agrees as follows:

                  (a) So long as Borrower is not in default hereunder,  Borrower
         shall have the right to process and sell  Borrower's  inventory  in the
         regular course of business.  Lender's security interest hereunder shall
         attach  to all  proceeds  of all  sales  or other  dispositions  of the
         Collateral.  If at any time any such proceeds  shall be  represented by
         any  instruments,  chattel  paper or  documents  of  title,  then  such
         instruments,  chattel  paper or  documents  of title  shall be promptly
         delivered  to Lender  and shall be  subject  to the  security  interest
         granted  hereby.  If  at  any  time  any  of  Borrower's  inventory  is
         represented  by any document of title,  such  document of title will be
         delivered  promptly  to Lender  and shall be  subject  to the  security
         interest granted hereby.

                  (b) By the  execution of this  Agreement,  Lender shall not be
         obligated  to do or perform  any of the acts or things  provided in any
         contracts  covered hereby that are to be done or performed by Borrower,
         but if there is a default by  Borrower in the payment of any amount due
         in respect of any indebtedness secured hereby, then




                                        5





         Lender may, at its  election,  perform  some or all of the  obligations
         provided in said  contracts to be performed by Borrower,  and if Lender
         incurs any liability or expenses by reason  thereof,  the same shall be
         payable  by  Borrower  upon  demand  and shall  also be secured by this
         Agreement.

                  (c) At any time  after  Borrower  is in default  hereunder  or
         under the Loan  Agreement,  Lender  shall  have the right to notify the
         account  debtors  obligated  on  any  or  all  of  Borrower's  accounts
         receivable  to make  payment  thereof  directly to Lender,  and to take
         control of all  proceeds of any such  accounts  receivable.  Until such
         time as Lender  elects to  exercise  such right by mailing to  Borrower
         written notice thereof, Borrower is authorized, as agent of the Lender,
         to collect and enforce said accounts receivable.

         12. Power of Attorney.  Borrower  hereby  constitutes the Lender or its
designee,  as Borrower's  attorney-in-fact  with power,  upon the occurrence and
during the continuance of an Event of Default,  to endorse  Borrower's name upon
any notes,  acceptances,  checks,  drafts,  money orders,  or other evidences of
payment or Collateral that may come into either its or the Lender's  possession;
to sign the name of Borrower on any invoice or bill of lading relating to any of
the accounts receivable, drafts against customers, assignments and verifications
of  accounts  receivable  and notices to  customers;  to send  verifications  of
accounts receivable; to notify the Post Office authorities to change the address
for  delivery of mail  addressed  to Borrower to such  address as the Lender may
designate; to execute any of the documents referred to in Section 3(e) hereof in
order to perfect and/or maintain the security interests and liens granted herein
by  Borrower  to the Lender;  and to do all other acts and things  necessary  to
carry out this  Security  Agreement.  All acts of said  attorney or designee are
hereby ratified and approved,  and said attorney or designee shall not be liable
for any acts of commission or omission  (other than acts of gross  negligence or
willful  misconduct),  nor for any error of  judgment or mistake of fact or law;
this power  being  coupled  with an  interest  is  irrevocable  until all of the
obligations  secured  hereby are paid in full and any and all  promissory  notes
executed in connection therewith are terminated and satisfied.

         13.  Governing Law and  Amendments.  This Agreement and all of the Loan
Documents  shall be  construed  and  enforced  under  the  laws of the  State of
Tennessee  applicable  to  contracts to be wholly  performed  in such State.  No
amendment or modification hereof shall be effective except in a writing executed
by each of the parties hereto.

         14. Survival of Representations and Warranties. All representations and
warranties  contained  herein or made by or furnished on behalf of the Borrowers
in  connection  herewith  shall  survive  the  execution  and  delivery  of this
Agreement.






                                        6




         15.  Counterparts.  This  Agreement  may be  executed  in any number of
counterparts   and  by   different   parties  to  this   Agreement  in  separate
counterparts,  each of which when so executed  shall be deemed to be an original
and all of which taken together shall constitute one and the same Agreement.

         16.  Construction  and  Interpretation.  Should any  provision  of this
Agreement  require  judicial  interpretation,  the parties hereto agree that the
court interpreting or construing the same shall not apply a presumption that the
terms hereof shall be more strictly construed against one party by reason of the
rule of construction  that a document is to be more strictly  construed  against
the party that itself or through its agent  prepared  the same,  it being agreed
that the Borrower,  Lender and their respective  agents have participated in the
preparation hereof.

         IN WITNESS  WHEREOF,  Borrower and Lender have executed this Agreement,
or have caused this Agreement to be executed as of the date first above written.

                                       BORROWER:

                                       DYNAGEN, INC.


                                       By:    /s/ Dhananjay G. Wadekar
                                             --------------------------------
                                       Title: Executive Vice President
                                             --------------------------------

                                       Address:  99 Erie Street
                                                 Cambridge, Massachusetts  02139


                                       LENDER:

                                       SIRROM CAPITAL  CORPORATION,  a Tennessee
                                       corporation,   for   itself  and  in  its
                                       capacity   as   Collateral    Agent   for
                                       Co-Lender and itself




                                       By:    /s/ [Illegible]
                                             --------------------------------
                                       Title: Vice President
                                             --------------------------------




                                        7



                                                                    EXHIBIT 99.3
                                                                    ------------

                              AMENDED AND RESTATED
                           LOAN AND SECURITY AGREEMENT

         This Amended and Restated Loan and Security Agreement (the "Agreement")
is entered into at Cincinnati, Ohio, by and between The Huntington National Bank
(hereinafter referred to as the "Bank"), and Superior Pharmaceutical Company, an
Ohio corporation (hereinafter referred to as the "Company"),  as of the 18th day
of June, 1997.

         WHEREAS,  on May 9, 1994, the Bank and the Company executed and entered
into a certain Loan and  Security  Agreement  (the  "Original  Loan  Agreement")
pursuant to the terms of which the Bank  extended  to the Company  credit in the
amount of $6,000,000.00;

         WHEREAS,  subsequent  to the execution of the Original  Agreement,  the
Bank and the Company entered into the following agreements modifying or amending
the Original  Agreement:  (i) A first  Amendment to Loan and Security  Agreement
dated as of January 19, 1995; (ii) a certain letter agreement dated as of May 4,
1995; (iii) a certain letter agreement dated as of July 31, 1995; (iv) a certain
letter  agreement  dated as of January 25, 1996;  (v) a certain  Loan  Extension
and/or  Modification  Agreement  dated  as of April  22,  1996;  (vi) a  certain
Amendment to Loan  Agreement  dated as of August 30,  1996;  and (vii) a certain
Amendment  to  Loan  Agreement  dated  as of  November  11,  1996  (referred  to
collectively with the Original Loan Agreement as the "Prior Loan Agreements");

         WHEREAS,  on February 19, 1997, the Bank increased the revolving credit
available to the Company  pursuant to, and the Company executed and delivered to
the  Bank,  a  Revolving  Note  in the  amount  of  $2,000,000.00  (referred  to
collectively with the Prior Loan Agreements as the "Prior Agreements"); and

         WHEREAS,  the  parties  hereto  desire  to amend and  restate  in their
entirety the  relationship  and  obligations  previously  evidenced by the Prior
Agreements,  to merge all the terms,  conditions and provisions set forth in the
Prior   Agreements  into  this  Agreement,   and  to  make  certain   additional
modifications therein.

         NOW,  THEREFORE,  in consideration of the mutual promises and covenants
herein contained, and certain other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged,  the parties hereto agree that
the  relationship and obligations  previously  evidenced by the Prior Agreements
are hereby  merged  into,  and amended and  restated in their  entirety by, this
Agreement,  which shall  hereafter  govern and  control  said  relationship  and
obligations  without  reference to the Prior  Agreements.  The execution of this
Agreement  shall not be deemed a  termination  of the  relationship  between the
parties hereto or the full payment or performance of the obligations  previously
existing between the parties and evidenced by the Prior Agreements, but shall be
deemed an amendment and restatement  thereof.  To the extent that any collateral
security  interests  were  created and  perfected in  connection  with the Prior
Agreements and the  obligations  evidenced  thereby,  such  collateral  security
interests shall remain in full force and effect,  and the priority thereof shall
remain unchanged. The parties hereto hereby agree as follows:

SECTION 1.  THE LOAN.
- ---------------------

         1.1  Amount  of Loan.  Subject  to the  terms  and  conditions  of this
Agreement,  the Bank  will  lend to the  Company  up to the sum of Nine  Million
Dollars ($9,000,000.00)  (hereinafter referred to as the "Loan"). The Loan shall
take the form of a revolving  credit and,  subject to the  provisions of Section
1.2 of this Agreement,  the outstanding  principal  balance may be increased and
decreased an unlimited number of times.  Subject to annual review and renewal by
the Bank (which renewal shall be at the Bank's sole  discretion),  the Company's
right to obtain  advances  pursuant to this revolving  credit shall terminate on
April 5, 1998.

         1.2  Borrowing Base for Loan.

         (a) Borrowing  Base. The principal  balance of the Loan  outstanding at
any one time  shall  not  exceed  an  amount  equal to the sum of (i) 80% of the
Company's Eligible Accounts Receiv able, as hereinafter  defined,  plus (ii) 60%
of the Company's Eligible Inventory, as hereinafter






defined, up to a maximum of $5,500,000.00 attributable to the Company's Eligible
Inventory (which sum of the said percentages is hereinafter  sometimes  referred
to as the "Borrowing Base").

         (b)  Eligible   Accounts   Receivable.   The  term  "Eligible   Account
Receivable"  or  "Eligible  Account"  means an account  receivable  owing to the
Company  from a party  (the  "Account  Debtor")  which met all of the  following
requirements  at the time it came into existence and which continues to meet the
same until it is collected in full:

                  (i) The  account is not more than 90 days past the date of its
                  invoice;

                  (ii) The account arose from the  performance of services or an
                  outright and lawful sale of goods and related  services by the
                  Company,  all such goods having been  lawfully  shipped to the
                  Account  Debtor,  and the Company has  possession of, and will
                  deliver  to the Bank if  requested  hereunder,  copies  of all
                  invoices,  shipping documents and delivery receipts evidencing
                  such shipment;

                  (iii) The amount of the account  does not include any sales or
                  other taxes;

                  (iv) The  account  did not arise from a consumer  transaction,
                  which shall be defined for  purposes of this  Agreement as the
                  providing of goods or services for purposes that are primarily
                  personal, family or household;

                  (v) The account is not subject to any prior assignment, claim,
                  lien or security  interest,  and the Company will not make any
                  further  assignment  thereof  or create any  further  security
                  interest therein nor permit the Company's rights therein to be
                  reached by  attachment,  levy,  garnishment  or other judicial
                  process;

                  (vi)  The  account  is not  subject  to any  set-off,  credit,
                  allowance,   adjustment  or  discount   (excepting   only  any
                  applicable  discount  for  prompt  payment),  and the  Account
                  Debtor has not  objected as to his  liability or the amount of
                  his  liability  thereon  and has not  returned  or claimed the
                  right to return  any of the  goods  from the sale out of which
                  the account arose;

                  (vii) The  account  did not arise  from a  transaction  with a
                  person, corporation or entity affiliated with the Company;

                  (viii)  The  account  arose  in  the  ordinary  course  of the
                  Company's business and no notice of bankruptcy,  insolvency or
                  financial  distress or embarrassment of the Account Debtor has
                  been received by the Company;

                  (ix) The Bank has not notified the Company that the account or
                  the  Account  Debtor  is  unsatisfactory  (although  the  Bank
                  reserves  the  right  to do so in its sole  discretion  at any
                  time); and

                  (x) The account is not evidenced by chattel paper,  nor by any
                  promissory  note,  payment  instrument  or  written  agreement
                  (other  than   invoices,   shipping   documents  and  delivery
                  receipts).

In the event that more than 50% of the Company's  Eligible  Accounts  Receivable
shall at any one time become more than 90 days past due,  none of the  Company's
accounts  receivable shall there after be Eligible  Accounts  Receivable,  until
such time, if any, as the Bank may, in its sole  discretion,  determine that the
Company's  percentage  of past due accounts has been  satisfactorily  reduced or
eliminated.  In  the  event  that  more  than  50% of  the  accounts  receivable
outstanding  from any one Account  Debtor shall at any one time become more than
90 days past due, none of the accounts receivable  outstanding from that Account
Debtor  shall  thereafter  be included in  calculating  the  Company's  Eligible
Accounts  Receivable,  until such  time,  if any,  as the Bank may,  in its sole
discretion determine otherwise.


                                        2





         (c)  Eligible  Inventory.  The term  "Eligible  Inventory"  means  that
inventory (as defined in Section 11.1 of this  Agreement) of the Company,  which
the Bank, in its sole credit  judgment,  deems to be Eligible  Inventory,  based
upon such credit and collateral considerations as the Bank may deem appropriate.
For purposes of determining  the Borrowing  Base,  Eligible  Inventory  shall be
valued at the lesser of cost or fair market value.  Unless the Bank shall in its
sole discretion determine otherwise, cost shall be calculated on a FIFO basis.

         (d)  Draws by the  Company.  No draws  on the Loan  shall be  permitted
unless the  Company  shall have  provided to the Bank a  certificate,  in a form
satisfactory to the Bank, which shall include a report on:

                  (i) the total  balance  due on all of the  Company's  accounts
                  receivable and the total balance due on all Eligible  Accounts
                  Receivable;

                  (ii) the total value of the Company's Eligible Inventory; and

                  (iii) the amount of the advance sought by the Company.

In addition, no draws on the Loan shall be permitted unless the Company shall be
in  compliance  with all of the  terms  of this  Agreement  and  with all  other
agreements with the Bank.

SECTION 2.  INTEREST RATE.
- --------------------------

         The Company  agrees to pay to the Bank  monthly  interest on the unpaid
balance of the Loan pursuant to the terms of a certain  Promissory  Note of even
date herewith (the "Note").

SECTION 3.  EVIDENCE OF THE LOAN AND TERMS OF PAYMENT.
- ------------------------------------------------------

         The  Loan  shall  be  evidenced  by the  Note or by one or  more  notes
subsequently executed in substitution  therefor.  Repayment of the Loan shall be
made in accordance with the terms of the note or notes then outstanding pursuant
to this Agreement.

SECTION 4.  USE OF PROCEEDS AND PREPAYMENT.
- -------------------------------------------

         The  proceeds  of the Loan  shall  be used by the  Company  solely  for
general  corporate  working  capital.  The  Company,  if  not  then  in  default
hereunder, may have the right to prepay at any time and from time to time before
maturity  amounts due to the Bank,  but only pursuant to the  provisions of this
Agreement,  the Note or any note or notes executed pursuant hereto.  The Company
acknowledges  that, under those specific  circumstances  identified in the Note,
prepayments of the Loan may be prohibited.

SECTION 5.  SECURITY.
- ---------------------

         As security for the Loan,  the Company has granted the Bank a first and
continuing  security  interest  in  all of the  Company's  accounts,  inventory,
equipment, documents,  instruments,  general intangibles, chattel paper, and all
other tangible and intangible  personal  property and fixtures of every kind and
description (including pharmaceutical distribution rights), whether now owned or
hereafter acquired or created by the Company, as more particularly  described in
and governed by Section 11 of this Agreement.  As further security for the Loan,
the Company shall  deliver the joint and several,  absolute,  unconditional  and
continuing  guaranty of payment of the Loan and payment and  performance  of all
other  obligations  of the Company  (the  "Guaranty")  in favor of the Bank from
DynaGen,  Inc., a Delaware corporation and the parent corporation of the Company
(the "Guarantor").

SECTION 6.  WARRANTIES AND REPRESENTATIONS.
- -------------------------------------------

         The Company warrants and represents to the Bank:


                                        3





         6.1  Subsidiaries.  The Company has no subsidiaries and will not create
or acquire any subsidiaries without the prior written consent of the Bank.

         6.2   Corporate Organization and Authority.  The Company:

         (a)      is a corporation duly organized,  validly existing and in good
                  standing under the laws of the State of Ohio;

         (b)      has all  requisite  power  and  authority  and  all  necessary
                  licenses and permits to own and operate its  properties and to
                  carry  on its  business  as  now  conducted  and as  presently
                  proposed to be conducted; and

         (c)      is not  doing  business  or  conducting  any  activity  in any
                  jurisdiction  in which it has not duly  qualified  and  become
                  authorized to do business.

         6.3 Financial  Statements.  The Company's financial  statements for the
fiscal year ended  December  31, 1996 and for the four month  period ended April
30, 1997, which have been supplied to the Bank, have been prepared in accordance
with generally accepted accounting  principles  consistently  applied and fairly
represent the Company's  financial  condition as of such date. There has been no
material  adverse change in the Company's  financial  condition  since April 30,
1997.

         6.4 Full Disclosure.  The financial  statements  referred to in Section
6.3 do not, nor does this  Agreement or any written  statement  furnished by the
Company to the Bank in connection  with  obtaining the Loan,  contain any untrue
statement  of a material  fact or omit a  material  fact  necessary  to make the
statements  contained  therein or herein not misleading.  There is no fact which
the Company has not  disclosed to the Bank in writing which  materially  affects
the  properties,   business,  prospects,  profits  or  condition  (financial  or
otherwise)  of the  Company  or the  ability  of the  Company  to  perform  this
Agreement.

         6.5 Pending  Litigation.  There are no proceedings  pending,  or to the
knowledge of the Company  threatened,  against or  affecting  the Company in any
court or before any  governmental  authority  or  arbitration  board or tribunal
which,  individually or in the aggregate,  involve the possibility of materially
and  adversely  affecting  the  properties,   business,  prospects,  profits  or
condition (financial or otherwise) of the Company, or the ability of the Company
to perform this Agreement,  except as set forth on one or more schedules to this
Agreement.

         6.6 Title to Properties.  The Company has good and marketable  title to
all the property which it purports to own (except as sold or otherwise  disposed
of in the ordinary  course of business),  free from any liens and  encumbrances,
except those to which the Bank has previously consented.

         6.7   Borrowing is Legal and Authorized.

         (a) The Board of  Directors  of the  Company  has duly  authorized  the
execution  and  delivery  of  this  Agreement  and of the  notes  and  documents
contemplated  herein,  and the note or notes  executed in  connection  with this
Agreement  will  constitute  valid  and  binding   obligations  of  the  Company
enforceable in accordance with their terms.

         (b) The execution of this Agreement and related notes and documents and
the compliance by the Company with all the provisions of this Agreement:

         (i)      are within the corporate powers of the Company; and

         (ii)     are legal and will not conflict with,  result in any breach in
                  any of the  provisions  of,  constitute  a default  under,  or
                  result in the  creation  of any lien or  encumbrance  upon any
                  property  of  the  Company  under  the   provisions   of,  any
                  agreement,  charter instrument,  bylaw, or other instrument to
                  which the Company is a party or by which it may be bound.

                                        4




         (c) There are no limitations in any indenture,  mortgage, deed of trust
or other agreement or instrument to which the Company is now a party or by which
the Company may be bound with respect to the payment of principal or interest on
any  indebtedness of the Company,  including the Note or notes to be executed in
connection with this Agreement.

         6.8 No Defaults.  No event has  occurred and no condition  exists which
would constitute an Event of Default pursuant to this Agreement.  The Company is
not in violation in any material  respect of any term of any agreement,  charter
instrument,  bylaw or other instrument to which it is a party or by which it may
be bound.

         6.9  Government  Consent.  Neither  the nature of the Company or of its
business or properties,  nor any relationship  between the Company and any other
entity or person,  nor any circumstance in connection with the execution of this
Agreement,  is such as to require a consent,  approval or  authorization  of, or
filing,  registration or qualification  with, any governmental  authority on the
part of the  Company  as a  condition  to the  execution  and  delivery  of this
Agreement and the notes and documents contemplated herein.

         6.10  Taxes.

         (a)  All  tax  returns  required  to be  filed  by the  Company  in any
jurisdiction have in fact been filed, and all taxes, assessments, fees and other
governmental charges upon the Company, or upon any of its respective properties,
which are due and  payable  have been  paid.  The  Company  does not know of any
proposed additional tax assessment against it.

         (b) The  provisions  for  taxes  on the  books of the  Company  for its
current fiscal period are adequate.

         6.11 Compliance with Law. The Company:

         (a)      is not in  violation  of any  laws,  ordinances,  governmental
                  rules or regulations to which it is subject; and

         (b)      has not failed to obtain any licenses,  permits, franchises or
                  other governmental  authorizations  necessary to the ownership
                  of its properties or to the conduct of its business,

which violation or failure to obtain might  materially and adversely  affect the
business,  prospects,  profits, properties or condition (financial or otherwise)
of the Company.

         6.12  Restrictions  on  Company.  The  Company  is not a  party  to any
contract or agreement, or subject to any charter or other corporate restriction,
which materially and adversely affects the business of the Company.  The Company
is not a party to any contract or agreement which restricts the right or ability
of the Company to incur indebtedness, other than this Agreement. The Company has
not agreed or consented to cause or permit in the future (upon the  happening of
a contingency or otherwise) any of its property,  whether now owned or hereafter
acquired, to be subject to a lien or encumbrance.

         6.13 Environmental  Protection.  The Company represents and warrants to
Bank that, to its knowledge after due investigation:

         (a)      that the property at which it operates (the "Property") is not
                  being  and has not  been  used  for  the  storage,  treatment,
                  generation,  transportation,  processing, handling, production
                  or disposal of any  hazardous  substance  in  violation of any
                  environmental laws;

         (b)      the  Property  does not contain  any  hazardous  substance  in
                  violation of any environmental laws;


                                        5




         (c)      there has been no release of any hazardous substance on, at or
                  from the  Property or any  property  adjacent to or within the
                  immediate  vicinity of the  Property,  and the Company has not
                  received  any form of notice or inquiry  with regard to such a
                  release or the threat of such a release;

         (d)      no event has occurred with respect to the Property which, with
                  the  passage of time or the giving of notice,  or both,  would
                  constitute a violation of any applicable environmental laws;

         (e)      there  are  no  agreements  or  orders  or  directives  of any
                  federal,  state  or local  governmental  agency  or  authority
                  relating  to the  Property  which  require  any work,  repair,
                  construction,  containment, clean up, investigations, studies,
                  removal or other remedial action with respect to the Property;
                  and

         (f)      there are no actions, suits, claims or proceedings, pending or
                  threatened,  which  seek  any  remedy  that  arise  out of the
                  condition,   ownership,  use,  operation,  sale,  transfer  or
                  conveyance  of the  Property  and (I) a  violation  or alleged
                  violation  of any  applicable  environmental  laws,  (II)  the
                  presence  of  any  hazardous   substance  or  release  of  any
                  hazardous  substance or the threat of such a release, or (III)
                  human exposure to any hazardous substance.

SECTION 7.  CLOSING CONDITIONS.
- -------------------------------

         The  obligation  of the Bank to make the Loan  shall be  subject to the
following conditions precedent:

         7.1  Compliance  with this  Agreement.  By the  execution  hereof,  the
Company  certifies  that it has performed and complied with all  agreements  and
conditions  contained herein which are required to be performed or complied with
by the Company before or at closing.

         7.2  Certified  Resolutions.  The Bank shall have  received a certified
copy of resolutions adopted by the Board of Directors of the Company authorizing
the execution and delivery of this Agreement and the notes and related documents
described  herein,  in a form  satisfactory  to the Bank, as well as a certified
copy  of  resolutions  adopted  by the  Board  of  Directors  of  the  Guarantor
authorizing the execution and delivery of the Guaranty.

         7.3  Warranties  and  Representations.  On the  date  of  each  advance
pursuant to the Loan, the warranties and  representations set forth in Section 6
hereof  shall be true and correct on and as of such date with the same effect as
though such warranties and representations had been made on and as of such date,
except to the extent that such warranties and  representations  expressly relate
to an earlier date.

SECTION 8.  COMPANY BUSINESS COVENANTS.
- ---------------------------------------

         The Company covenants that on and after the date of this Agreement,  so
long as any of the indebtedness provided for herein remains unpaid:

         8.1  Payment of Taxes and  Claims.  The  Company  will pay before  they
become delinquent:

         (a)      all  taxes,  assessments  and  governmental  charges or levies
                  imposed upon it or its property; and

         (b)      all  claims or demands of  materialmen,  mechanics,  carriers,
                  warehousemen, landlords, bailees and other like persons which,
                  if  unpaid,  might  result  in  the  creation  of  a  lien  or
                  encumbrance upon its property,

provided  that items of the foregoing  description  need not be paid while being
contested in good faith and by appropriate proceedings and provided further that
adequate book reserves have been

                                        6




established  with respect thereto and provided  further that the Company's title
to, and its right to use,  its  property is not  materially  adversely  affected
thereby.  In the  case of any item of the  foregoing  description  involving  in
excess of the amount which the Company's  independent  public  accountants shall
fix as the  threshold  of  materiality  for  purposes of their audit of the then
current year, the  appropriateness  of the proceedings  shall be supported by an
opinion of the  independent  counsel  responsible  for such  proceedings and the
adequacy of such reserves  shall be supported by the opinion of the  independent
accountants.

         8.2  Maintenance  of Properties  and Corporate  Existence.  The Company
shall:

         (a)      Property--maintain its property in good condition and make all
                  renewals,    replacements,    additions,    betterments    and
                  improvements   thereto  which  are  deemed  necessary  by  the
                  Company;

         (b)      Insurance--maintain,  with  financially  sound  and  reputable
                  insurers,   insurance  with  respect  to  its  properties  and
                  business  against such casualties and  contingencies,  of such
                  types (including but not limited to fire and casualty,  public
                  liability,  products liability, larceny, embezzlement or other
                  criminal misappropriation insurance) and in such amounts as is
                  customary  in  the  case  of   corporations   of   established
                  reputations  engaged  in the same or a  similar  business  and
                  similarly situated;

         (c)      Financial  Records--keep  true books,  records and accounts in
                  which  full  and  correct  entries  will  be  made  of all its
                  business transactions, and reflect in its financial statements
                  adequate  accruals  and  appropriations  to  reserves,  all in
                  accordance with generally accepted accounting principles;

         (d)      Corporate  Existence  and  Rights--do  or cause to be done all
                  things  necessary  (i) to preserve  and keep in full force and
                  effect  its  existence,  rights  and  franchises,  and (ii) to
                  maintain  its  status  as a  corporation  duly  organized  and
                  existing and in good  standing  under the laws of the state of
                  its incorporation; and

         (e)      Compliance   with  Law--not  be  in  violation  of  any  laws,
                  ordinances,  or governmental rules and regulations to which it
                  is subject and will not fail to obtain any licenses,  permits,
                  franchises or other governmental  authorizations  necessary to
                  the  ownership  of its  properties  or to the  conduct  of its
                  business,   which   violation   or  failure  to  obtain  might
                  materially  and  adversely  affect  the  business,  prospects,
                  profits,  properties or condition  (financial or otherwise) of
                  the Company.

         8.3  Sale of Assets or Merger.

         (a) Sale of Assets.  The Company  will not,  without the prior  written
consent of the Bank,  except in the ordinary  course of business,  sell,  lease,
transfer or otherwise dispose of, any of its assets.

         (b) Merger and  Consolidation.  The Company will not, without the prior
written consent of the Bank, consolidate with or merge into any other entity, or
permit any other entity to consolidate with or merge into it.

         8.4 Liens and Encumbrances. The Company will not (i) cause or permit or
(ii) agree or consent to cause or permit in the future (upon the  happening of a
contingency or otherwise),  any of its property,  whether now owned or hereafter
acquired,  to be  subject  to a lien or  encumbrance  in excess  of  $100,000.00
without giving the Bank prior written notice thereof;  provided,  however,  that
the following liens do not require prior written notice regardless of amount:

         (a)      liens securing taxes,  assessments or governmental  charges or
                  levies or the  claims or demands  of  materialmen,  mechanics,
                  carriers,  warehousemen,  landlords  and  other  like  persons
                  provided  the payment  thereof is not at the time  required by
                  Section 8.1;

                                        7




         (b)      liens  incurred or  deposits  made in the  ordinary  course of
                  business  (i)  in  connection  with  workmen's   compensation,
                  unemployment  insurance,  social security and other like laws,
                  or (ii) to secure the performance of letters of credit,  bids,
                  tenders,  sales  contracts,   leases,  statutory  obligations,
                  surety,   appeal  and  performance  bonds  and  other  similar
                  obligations  not incurred in connection  with the borrowing of
                  money,  the  obtaining  of  advances  or  the  payment  of the
                  deferred purchase price of property;

         (c)      attachment,  judgment  and  other  similar  liens  arising  in
                  connection with court  proceedings,  provided the execution or
                  other enforcement of such liens is effectively  stayed and the
                  claims secured  thereby are being  actively  contested in good
                  faith and by appropriate proceedings;

         (d)      reservations, exceptions, encroachments,  easements, rights of
                  way,  covenants,  conditions,  restrictions,  leases and other
                  similar  title  exceptions  or  encumbrances   affecting  real
                  property,  provided  they do not in the  aggregate  materially
                  detract  from  the  value  of  said   property  or  materially
                  interfere  with its use in the ordinary  conduct of the owning
                  company's business;

         (e)      inchoate  liens arising  under ERISA to secure the  contingent
                  liability of the Company.

         8.5  Other  Borrowings.  The  Company  will not  create  or  incur  any
indebtedness for borrowed money or advances,  including through the execution of
capitalized lease agreements,  in excess of $100,000.00  without giving the Bank
prior written notice thereof.

         8.6 Contingent Liabilities.  The Company will not guarantee, indorse or
otherwise  become  surety  for or upon the  obligations  of  others,  except  by
indorsement of negotiable  instruments for deposit or collection in the ordinary
course of  business,  in excess of  $100,000.00  without  giving  the Bank prior
written notice thereof.

         8.7 Operating Lease Rentals.  The Company will not enter into operating
leases  providing in the aggregate for annual  rentals in excess of  $100,000.00
without giving the Bank prior written notice thereof.

         8.8 Loans and Advances by the Company.  The Company  shall not make any
loans or advances to any person, corporation or entity if such loans will exceed
an aggregate total outstanding at any one time of $100,000.00  without the prior
written consent of the Bank.

         8.9  Distributions  by the Company to the Guarantor.  The Company shall
not,  without the prior written consent of the Bank, make any  distributions  to
the Guarantor,  whether in the form of dividends,  subordinated debt payments or
otherwise,  other than  distributions of sums sufficient to enable the Guarantor
to pay the principal and interest due to the former  shareholders of the Company
(the  "Shareholders") in connection with the Guarantor's  purchase of all of the
capital stock of the Company from the Shareholders; provided, however, that such
permitted  payments  shall  not be  made  by the  Company,  or  received  by the
Guarantor, following the occurrence of, and during the continuation of, an event
default hereunder, and notice to the Guarantor thereof.

         8.10  Acquisition  of Capital  Stock.  The Company  shall not redeem or
acquire any of its own capital stock except  through the use of the net proceeds
from the simultaneous sale of an equivalent amount of its capital stock.

         8.11  Investments.  The  Company  shall  not  purchase  for  investment
securities  of any kind,  excepting  bonds or other  obligations  of the  United
States or its federal  agencies,  certificates  of deposit  issued by commercial
banks or savings associations and commercial paper rated at least A-1 or P-1 and
having a maturity of not more than one year.


                                        8




         8.12  Sale of  Receivables.  The  Company  shall  not  sell  any of its
accounts receivable or notes receivable,  with or without recourse, nor shall it
assign or encumber any of its accounts receivable or notes receivable.

         8.13 Bank of Account.  During the term of this  Agreement,  the Company
shall  maintain  its primary  depository  relationship  (including  checking and
savings  accounts)  with the Bank. The Company hereby grants the Bank a security
interest in such accounts and all other  properties  owned by the Company now or
hereafter in the  possession of the Bank as security for payment of the Loan and
all other  obligations  of the Company to the Bank.  The Bank shall  continue to
make Cash Management, Bank Card and other services available to the Company.

         8.14 Working  Capital.  The Company shall maintain a working capital of
not less than  $2,350,000.00  through  the date  hereof,  and shall  maintain  a
working capital of not less than $3,750,000.00  thereafter.  For the purposes of
this Agreement,  "working  capital" shall mean the excess of current assets over
current  liabilities,  both as determined in accordance with generally  accepted
accounting principles consistently applied.

         8.15  Tangible  Net Worth and  Subordinated  Debt.  The  Company  shall
maintain an aggregate of tangible net worth plus  subordinated  debt of not less
than  $2,750,000.00  through the date hereof, and shall maintain an aggregate of
tangible  net  worth  plus  subordinated  debt of not  less  than  $4,250,000.00
thereafter.

         8.16 Ratio of Total Liabilities to Tangible Net Worth Plus Subordinated
Debt. The Company shall  maintain a ratio of total  liabilities to the aggregate
of tangible net worth plus  subordinated  debt of not greater than  3.00-to-1.00
through the date hereof,  and shall maintain a ratio of total liabilities to the
aggregate  of tangible  net worth plus  subordinated  debt of not  greater  than
2.30-to-1.00 thereafter.

         8.17 Interest  Coverage  Ratio.  The Company shall maintain an interest
coverage  ratio (defined as earnings  before  interest and taxes divided by paid
interest expense) of 2.00-to-1.00.

         8.18 ERISA.  The Company  shall with  respect to any  employee  pension
benefit plan it maintains:

         (a)      at all times make prompt payment of contributions  required to
                  meet the minimum  funding  standards  set forth in Section 302
                  through 305 of ERISA with respect to the plan,

         (b)      promptly, after the filing thereof, furnish to the Bank copies
                  of each annual report required to be filed pursuant to Section
                  103 of ERISA in  connection  with the plan for the plan  year,
                  including  any  certified  financial  statements  or actuarial
                  statements required pursuant to said Section 103,

         (c)      notify the Bank  immediately of any fact,  including,  but not
                  limited to, any "Reportable Event," as that term is defined in
                  Section  4043 of ERISA,  arising in  connection  with the plan
                  which might constitute grounds for termination  thereof by the
                  Pension Benefit Guaranty Corporation or for the appointment by
                  the  appropriate  United States District Court of a Trustee to
                  administer the plan,

         (d)      notify the Bank of any  "Prohibited  Transaction" as that term
                  is defined in Section 406 of ERISA.

 The Company will not:

         (e)      engage in any "Prohibited Transaction," or

         (f)      terminate  any such plan in a manner which could result in the
                  imposition  of a lien on the property of the Company  pursuant
                  to Section 4068 of ERISA.


                                        9



         8.19     Environmental Protection.

         (a)      Covenants.  The  Company  covenants  and  agrees  with Bank as
                  follows:

         (i)      Company shall keep,  and shall cause all  operators,  tenants,
                  sub-tenants,  licensees and occupants of the Property to keep,
                  the  Property  free of all  hazardous  substances,  except for
                  hazardous substances stored, treated, generated,  transported,
                  processed,  handled,  produced  or  disposed  of in the normal
                  operation of the Property in accordance with all Environmental
                  Laws.

         (ii)     Company  shall  comply  with,  and shall cause all  operators,
                  tenants, sub-tenants,  licensees and occupants of the Property
                  to comply with, all environmental laws.

         (iii)    Company  shall  promptly  provide  the Bank with a copy of all
                  notifications  which Company gives or receives with respect to
                  any past or present release of any hazardous  substance or the
                  threat of such a release  on, at or from the  Property  or any
                  property  adjacent to or within the immediate  vicinity of the
                  Property.

         (iv)     Company  shall  undertake  and  complete  all  investigations,
                  studies,   sampling  and  testing  for  hazardous   substances
                  required by Bank and,  in  accordance  with all  environmental
                  laws,  all removal and other  remedial  actions  necessary  to
                  contain, remove and clean up all hazardous substances that are
                  determined  to be present at the  Property in violation of any
                  environmental laws.

         (v)      Bank shall have the right, but not the obligation, to cure any
                  violation by Company of the environmental laws.

         (b)  Indemnity.  Company  covenants  and  agrees,  at its sole cost and
expense,  to  indemnify,  defend and save the Bank harmless from and against any
and  all  damages,  losses,   liabilities,   obligations,   penalties,   claims,
litigation,  demands, defenses, judgments, suits, actions,  proceedings,  costs,
disbursements  and/or  expenses  (including,   without  limitation,   reasonable
attorneys'  and experts'  fees and  expenses)  of any kind or nature  whatsoever
which may at any time be  imposed  upon,  incurred  by or  asserted  or  awarded
against the Bank arising out of the condition,  ownership, use, operation, sale,
transfer or conveyance of the Property and

         (i)      the   storage,    treatment,    generation,    transportation,
                  processing,  handling, production or disposal of any hazardous
                  substance;

         (ii)     the  presence of any  hazardous  substance or a release of any
                  hazardous substance or the threat of such a release;

         (iii)    human exposure to any hazardous substance;

         (iv)     a violation of any environmental laws; or

         (v)      a   material    misrepresentation   or   inaccuracy   in   any
                  representation or warranty or material breach of or failure to
                  perform any covenant made by Company herein (collectively, the
                  "Indemnified Matters").

The  liability  of Company  to the Bank  hereunder  shall in no way be  limited,
abridged,  impaired or otherwise  affected by (A) the  repayment of all sums and
the satisfaction of all obligations of Company under this Agreement or any other
document or agreement executed in connection  herewith or referenced herein (the
"Loan  Documents"),  (B) the  foreclosure  of any  mortgage  or  other  security
interest,  or the  acceptance  of a deed in lieu  thereof,  (C) any amendment or
modification  of the Loan  Documents  by or for the  benefit  of  Company or any
subsequent  owner of the  Property,  (D) any  extensions  of time for payment or
performance required by the Loan Documents,  (E) the release or discharge of any
Loan  Document  or of  Company,  the  Guarantor  or any  other  person  from the
performance  or  observance  of any  of  the  agreements,  covenants,  terms  or
conditions  contained in the Loan Documents whether by the Bank, by operation of
law or

                                       10



otherwise,  (F)  the  invalidity  or  unenforceability  of any of the  terms  or
provisions of the Loan Documents, (G) any exculpatory provision contained in the
Loan Documents limiting the Bank's recourse to the Property,  (H) any applicable
statute of limitations,  (I) the sale or assignment of the Loan  Documents,  (J)
the sale,  transfer or conveyance of all or part of the Property,  (K) the legal
incapacity of the Company, (L) the release or discharge, in whole or in part, of
the  Company  in  any  bankruptcy,  insolvency,   reorganization,   arrangement,
readjustment,  composition,  liquidation or similar proceeding, or (M) any other
circumstances  which might otherwise  constitute a legal or equitable release or
discharge,  in whole or in part,  of the Company under the Loan  Documents.  The
foregoing  indemnity  shall be in addition to any and all other  obligations and
liabilities the Company may have to the Bank at common law.

         8.20  No  Consignment.  The  Company  shall  not  include  in  Eligible
Inventory  any items  consigned  to the  Company  for sale nor shall the Company
consign its inventory to another for sale.

         8.21  Ownership  and  Management.  The  Company  shall not  permit  any
material change in its ownership or management,  including,  but not limited to,
the discharge or resignation of Eric C. Hagerstrand or Dennis B. Smith.

SECTION 9.  INFORMATION AS TO COMPANY.
- --------------------------------------

         The Company shall deliver the following to the Bank:

         (a)      within  20  days  after  the  end  of  each  month,  financial
                  statements, including a balance sheet and statements of income
                  and  surplus,  certified by the  president or chief  financial
                  officer of the Company as fairly  representing  the  Company's
                  financial  condition and results of operations  for the period
                  then ended;

         (b)      within 20 days after the end of each month, a statement signed
                  by the  president  or chief  financial  officer of the Company
                  certifying  that the  Company is in  compliance  with terms of
                  this Agreement;

         (c)      within 20 days after the end of each month, a report signed by
                  the  president  or  chief  financial  officer  of the  Company
                  setting   forth  the  number  and  dollar  total  of  accounts
                  receivable  past due for not more than 30 days, the number and
                  dollar  total  past due for not more than 60 days,  the number
                  and dollar  total past due for not more than 90 days,  and the
                  number and dollar total past due for more than 90 days;

         (d)      within  120  days of the end of each  fiscal  year,  financial
                  statements  prepared in  accordance  with  generally  accepted
                  accounting  principles  consistently  applied,  audited  by an
                  independent  public  accountant   satisfactory  to  the  Bank,
                  containing  a balance  sheet  and  statements  of  income  and
                  surplus,  and  fairly  representing  the  Company's  financial
                  condition and results of operations for the period then ended;

         (e)      within 45 days  after the end of each  fiscal  quarter  of the
                  Guarantor,   a  copy  of  the  Guarantor's  Form  10-Q  fairly
                  representing the Guarantor's  financial  condition and results
                  of operations for the period then ended;

         (f)      within  120  days  of  the  end of  each  fiscal  year  of the
                  Guarantor,  financial  statements  prepared in accordance with
                  generally accepted accounting principles consistently applied,
                  audited by an independent  public  accountant  satisfactory to
                  the Bank,  containing a balance sheet and statements of income
                  and surplus, and fairly representing the Guarantor's financial
                  condition and results of operations for the period then ended;

         (g)      immediately  upon  becoming  aware  of  the  existence  of any
                  condition or event which  constitutes  an Event of Default,  a
                  written notice specifying the nature and


                                       11



                  period  of existence  thereof and what  action the  Company is
                  taking or  proposes to take with respect thereto;

         (h)      at the request of the Bank, such other information as the Bank
                  may from time to time reasonably require.

In addition,  the Bank's Asset Based  Lending  Division  ("ABLD")  shall perform
semi-annual  audits of the Company.  These audits shall be at no cost or expense
to the Company,  but the Company  shall provide the ABLD auditors with access to
such  books,  records  and other  documentation  and  information  as they shall
reasonably require for the purpose of performing such audits.

SECTION 10.  EVENTS OF DEFAULT.
- -------------------------------

         10.1 Nature of Events.  An "Event of Default" shall exist if any of the
following occurs and is continuing:

         (a)      the Company  fails to make any payment on any note executed in
                  connection  with this  Agreement  on or  before  the date such
                  payment is due;

         (b)      the Company  fails to make any payment of interest on any note
                  executed in connection  with this  Agreement on or before five
                  days after the date such payment is due;

         (c)      the Company fails to perform or observe any covenant contained
                  in this Agreement, or fails to comply with any other provision
                  of this Agreement, and such failure continues for more than 30
                  days  after  such  failure  shall  first  become  known to any
                  officer of the Company;

         (d)      any  warranty,  representation  or  other  statement  by or on
                  behalf of the Company  contained in this Agreement,  or in any
                  instrument  furnished  in  compliance  with or in reference to
                  this  Agreement,  or  relating to the  Guarantor,  is false or
                  misleading in any material respect;

         (e)      the Company  defaults on any obligation to the Bank, or on any
                  other obligation to its  shareholders or trade creditors,  and
                  such results in a material,  negative  impact on the Company's
                  condition (financial or otherwise);

         (f)      the  Company  becomes  insolvent  or  bankrupt,  or  makes  an
                  assignment  for the benefit of  creditors,  or consents to the
                  appointment of a trustee, receiver or liquidator;

         (g)      bankruptcy,   reorganization,   arrangement,   insolvency   or
                  liquidation  proceedings  are  instituted  by or  against  the
                  Company;

         (h)      the Company or any indorser,  surety, or guarantor of the Loan
                  is dissolved or dies;

         (i)      a final judgment or judgments,  from which no further right of
                  appeal exists,  for the payment of money aggregating in excess
                  of $100,000.00 is or are  outstanding  against the Company and
                  any one of such judgments has been  outstanding  for more than
                  180  days  from  the  date  of its  entry  and  has  not  been
                  discharged in full or stayed;

         (j)      the property  furnished as security declines in value, and the
                  Company  does not  immediately,  upon  demand  from the  Bank,
                  furnish to the Bank additional security of like value;


                                       12




         (k)      the Guarantor  fails to contribute a minimum of  $1,500,000.00
                  to the  Company in the form of  subordinated  debt,  an equity
                  purchase or a capital contribution by the date hereof;

         (l)      the Guarantor has not achieved a tangible net worth, exclusive
                  of the effect thereon of the $4,250,000.00  tangible net worth
                  of the  Company,  of  $3,000,000.00  by the  execution of this
                  Agreement, or fails to achieve a tangible net worth, exclusive
                  of the effect thereon of the $4,250,000.00  tangible net worth
                  of the Company, of $4,000,000.00 within 120 days following the
                  execution  hereof  and to  thereafter  maintain  such level of
                  tangible net worth during the existence of this Agreement; or

         (m)      an event of default  occurs and continues  past any applicable
                  cure period in any obligation owed by Guarantor and secured by
                  Guarantor's or the Company's assets or capital stock.

         10.2  Default Remedies.

         (a)  Acceleration.  If  an  Event  of  Default  exists,  the  Bank  may
immediately  exercise any right,  power or remedy  permitted to the Bank by law,
and shall have, in particular, without limiting the generality of the foregoing,
the right to declare the entire  principal and all interest accrued on all notes
then  outstanding  pursuant to this  Agreement to be forthwith  due and payable,
without any  presentment,  demand,  protest or other notice of any kind,  all of
which are hereby expressly waived by the Company.

         (b)  Nonwaiver.  No course of  dealing  on the part of the Bank nor any
delay or failure on the part of the Bank to exercise any right shall  operate as
a waiver of such right or  otherwise  prejudice  the Bank's  rights,  powers and
remedies.

SECTION 11.  SECURITY AGREEMENT
- -------------------------------

         11.1 Grant of Security Interest. The Company hereby grants, pledges and
assigns to the Bank a security interest in the following  property,  whether the
Company's interest therein as owner, co-owner, lessee, consignee,  secured party
or  otherwise be now owned or existing,  or hereafter  arising or acquired,  and
wherever located, together with all substitutions,  replacements,  additions and
accessions therefor or thereto,  all replacement and repair parts therefor,  all
documents  including,  but not limited to,  negotiable  documents,  documents of
title,  warehouse  receipts,  storage  receipts,  dock receipts,  dock warrants,
express bills,  freight  bills,  airbills,  bills of lading and other  documents
relating  thereto,  all  products  thereof  and all cash and  non-cash  proceeds
thereof  including,  but not limited to,  notes,  drafts,  checks,  instruments,
insurance  proceeds,  indemnity  proceeds,  warranty and  guaranty  proceeds and
proceeds arising in connection with any requisition, confiscation, condemnation,
seizure  or  forfeiture  of all or any  part of the  following  property  by any
governmental body, authority, bureau or agency (or any person acting under color
of governmental authority):

         (a)      All of the Company's machinery,  equipment,  tools, furniture,
                  furnishings  and fixtures  including,  but not limited to, all
                  manufacturing,   fabricating,   processing,  transporting  and
                  packaging  equipment,  power  systems,  heating,  cooling  and
                  ventilating  systems,  lighting  and  communications  systems,
                  electric,  gas and water  distribution  systems,  food service
                  systems, fire prevention,  alarm and security systems, laundry
                  systems and computing and data processing systems (hereinafter
                  sometimes called the "Equipment");

         (b)      All of the Company's inventory including,  but not limited to,
                  all goods,  merchandise and other personal property  furnished
                  under any  contract of service or intended  for sale or lease,
                  all parts, supplies, raw materials,  work in process, finished
                  goods,  materials used or consumed in the Company's  business,
                  repossessed and returned goods  (hereinafter  sometimes called
                  the "Inventory");


                                       13




         (c)      All of the Company's accounts,  accounts receivable,  contract
                  rights,  guaranties  of accounts,  chattel  paper,  income tax
                  refunds,  instruments,  negotiable  documents,  notes, drafts,
                  acceptances  and other forms of  obligations  and  receivables
                  arising  from  or in  connection  with  the  operation  of the
                  Company's  business  including,  but  not  limited  to,  those
                  arising from or in connection with the Company's  sale,  lease
                  or  other  disposition  of  Inventory  (hereinafter  sometimes
                  called the "Receiv  ables"),  and all books,  records,  ledger
                  cards,  computer  programs and other  documents or property at
                  any time evidencing or relating to the Receivables; and

         (d)      All  of  the  Company's  general  intangibles,   trade  names,
                  trademarks,   trade   secrets,   goodwill,   patents,   patent
                  applications,    copyrights,   deposit   accounts,   licenses,
                  franchises  and  distribution  rights  (all  of the  foregoing
                  hereinafter sometimes called the "Collateral").

         The security  interest  hereby granted is to secure the prompt and full
payment and complete  performance of all Obligations of the Company to the Bank.
The word  "Obligations"  is used in its most  comprehensive  sense and includes,
without  limitation,   all  indebtedness,   debts  and  liabilities   (including
principal,  interest,  late charges,  collection costs,  attorneys' fees and the
like) of the Company to the Bank,  whether now  existing or  hereafter  arising,
either created by the Company alone or together with another or others,  primary
or  secondary,  secured or  unsecured,  absolute or  contingent,  liquidated  or
unliquidated,  direct or indirect, whether evidenced by note, draft, application
for letter of credit or  otherwise,  and any and all renewals of or  substitutes
therefor.  The word  "Obligations"  shall  include,  BUT NOT BE LIMITED  TO, all
indebtedness owed by the Company to the Bank in connection with the Loan.

         It is the  Company's  express  intention  that this  Agreement  and the
continuing security interest granted hereby, in addition to covering all present
Obligations of the Company to the Bank,  shall extend to all future  Obligations
of the  Company to the Bank,  whether  or not such  Obligations  are  reduced or
entirely  extinguished  and thereafter  increased or reincurred,  whether or not
such Obligations are related to the indebtedness identified above by class, type
or kind and whether or not such Obligations are specifically contemplated by the
Company and the Bank as of the date hereof. The absence of any reference to this
Agreement in any documents, instru ments or agreements evidencing or relating to
any Obligation secured hereby shall not limit or be construed to limit the scope
or applicability of this Agreement.

         11.2 General  Covenants as to the Collateral.  The Company  represents,
warrants and covenants as follows:

         (a)      Except for such claims and interest, if any, to which the Bank
                  has  consented  in advance and the security  interest  granted
                  hereby (i) the Company is, or as to  Collateral  arising or to
                  be acquired after the date hereof, shall be, the sole owner of
                  the  Collateral   free  from  any  and  all  liens,   security
                  interests,  encumbrances,  claims and  interests;  and (ii) no
                  security agreement,  financing statement,  equivalent security
                  or lien instrument or continuation  statement  covering any of
                  the Collateral is on file or of record in any public office.

         (b)      Except as otherwise  provided in this  Agreement,  the Company
                  shall not  create,  permit or suffer to exist,  and shall take
                  such  action  as is  necessary  to  remove,  any  claim  to or
                  interest in or lien or encumbrance  upon the  Collateral,  and
                  shall defend the right,  title and interest of the Bank in and
                  to the  Collateral  against  all  claims  and  demands  of all
                  persons  and  entities  at any time  claiming  the same or any
                  interest therein.

         (c)      The Company's  principal place of business and chief executive
                  office is located at the address set forth in Section  12.1 of
                  this  Agreement;  the Company has no other place of  business;
                  and,  unless the Bank  consents  in writing to a change in the
                  location of the Equipment,  Inventory or the Company's records
                  concerning the

                                       14



                  Receivables prior to such a change in location, the Equipment,
                  Inventory and the Company's records concerning the Receivables
                  shall be kept at either of these locations.

         (d)      At least  thirty (30) days prior to the  occurrence  of any of
                  the  following  events,  the Company shall deliver to the loan
                  officer who is handling the Company's Obligations on behalf of
                  the Bank written notice of such impending events: (i) a change
                  in  the  Company's   principal  place  of  business  or  chief
                  executive office;  (ii) the opening or closing of any place of
                  business; or (iii) a change in the Company's name, identity or
                  corporate structure.

         (e)      Subject to any  limitation  stated  therein  or in  connection
                  therewith, all information furnished by the Company concerning
                  the   Collateral   or   otherwise  in   connection   with  the
                  Obligations, is or shall be at the time the same is furnished,
                  accurate, correct and complete in all material respects.

         (f)      The Collateral is and shall (i) remain personal  property and,
                  without the prior written  consent of the Bank,  which consent
                  may be withheld  pending the Bank's  receipt of such documents
                  or instruments as may be reasonably requested by the Bank, not
                  be  affixed  to real  estate  in such  manner  as to  become a
                  fixture or realty,  and (ii) be used  primarily  for  business
                  purposes.

         11.3  Application of Proceeds from the Collection of  Receivables.  All
amounts received by the Bank representing  payment of Receivables may be applied
by the Bank to the payment of the Obligations in such order of preference as the
Bank may determine,  or the Bank may, at its option,  impound all or any portion
of such  amounts  and retain  said  amounts as  security  for the payment of the
Obligations,  with the right on the part of the  Company,  upon  approval by the
Bank, to obtain the release of all or part of such impounded  amounts.  The Bank
may,  however,  at any time, apply all or any part of such impounded  amounts as
aforesaid.  The Company also authorizes the Bank at any time, without notice, to
appropriate and apply any balances,  credits, deposits, accounts or money of the
Company in the Bank's  possession,  custody or control to the  payment of any of
the Obligations.

         If any of the  Company's  Receivables  arise out of  contracts  with or
orders  from the  United  States  or any  State  or any  department,  agency  or
instrumentality  thereof,  the Company shall immediately notify the Bank thereof
in writing and shall execute any  instrument  and take any steps required by the
Bank in order that all money due and to become due under such  contract or order
shall be assigned to the Bank and due notice  thereof  given to the  appropriate
governmental agency.

         The  Company  agrees to  execute,  deliver,  file and  record  all such
notices, affidavits,  assignments, financing statements and other instruments as
shall in the  judgment  of the  Bank be  necessary  or  desirable  to  evidence,
validate and perfect the security  interest of the Bank in the Receivables.  The
Bank shall have the right to notify any person or entities owing any Receivables
and to demand  and  receive  payment,  but the Bank shall have no duty so to do.
Upon  request of the Bank at any time,  the Company  shall  notify such  account
debtors and shall  indicate on all  invoices to such  account  debtors  that the
accounts are payable to the Bank.

         11.4  Insurance.  The Company shall have and maintain  insurance at all
times with respect to all Equipment and Inventory (i) insuring  against risks of
fire  (including  so-called  extended  coverage),  explosion,  theft,  sprinkler
leakage and such other  casualties as the Bank may designate,  and (ii) insuring
against  liability  for  personal  injury and  property  damage  relating to the
Equipment and Inventory,  containing  such terms, in such form, for such periods
and written by such companies as may be satisfactory to the Bank, such insurance
to be payable to the Bank and the Company as their  interests  may  appear.  All
policies  of  insurance  shall  provide  for twenty  (20) days  written  minimum
cancellation  notice to the Bank and, at request of the Bank, shall be delivered
to and held by it. The Bank may act as attorney  for the  Company in  obtaining,
adjusting,  settling and canceling such  insurance and indorsing any drafts.  In
the event of failure to provide  insurance as herein provided,  the Bank may, at
its option, provide such

                                       15



insurance and the Company shall pay to the Bank, upon demand,  the cost thereof.
Should the Company fail to pay said sum to the Bank upon demand,  interest shall
accrue thereon,  from the date of demand until paid in full, at the highest rate
set forth in any document or instrument evidencing any of the Obligations.

         11.5  Inspection.  The  Company  shall at all times keep  accurate  and
complete  records of the  Receivables  and the Company shall,  at all reasonable
times and from time to time,  allow the Bank, by or through any of its officers,
agents, attorneys or accountants, to examine, inspect and make extracts from the
Company's  books and records and to arrange for  verification of the Receivables
directly  with  account  debtors or by other  methods to examine and inspect the
Collateral  wherever located.  The Company shall perform,  do, make, execute and
deliver all such  additional  and further act,  things,  deeds,  assurances  and
instruments as the Bank may require to more completely vest in and assure to the
Bank its rights hereunder and in or to the Collateral.

         11.6  Preservation and Disposition of Collateral.

         (a) Except for such claims and  interests  as are  otherwise  permitted
under this  Agreement,  the Company shall keep the Collateral  free from any and
all liens, security interests,  encumbrances,  claims and interests. The Company
shall advise the Bank promptly,  in writing and in reasonable detail, (i) of any
material encumbrance upon or claim asserted against any of the Collateral;  (ii)
of any material change in the  composition of the  Collateral;  and (iii) of the
occurrence  of any other  event  that  would  have a  material  effect  upon the
aggregate value of the Collateral or upon the security interest of the Bank.

         (b) The Company shall not sell or otherwise  dispose of the Collateral;
provided,  however, that until default, the Company may use the Inventory in any
lawful  manner  not  inconsistent  with  this  agreement  or with  the  terms or
conditions  of any policy of  insurance  thereon and may also sell or  otherwise
dispose of the  Inventory in the ordinary  course of the Company's  business.  A
sale in the ordinary  course of business shall not include a transfer in partial
or total satisfaction of a debt.

         (c) The Company shall keep the  Collateral in good  condition and shall
not misuse, abuse, secrete, waste or destroy and of the same.

         (d) The  Company  shall  not use the  Collateral  in  violation  of any
statute, ordinance, regulation, rule, decree or order.

         (e) The Company  shall pay  promptly  when due all taxes,  assessments,
charges  or levies  upon the  Collateral  or in respect to the income or profits
therefrom,  except that no such charge need be paid if (i) the validity  thereof
is  being  contested  in  good  faith  by  appropriate  proceedings;  (ii)  such
proceedings  do not  involve  any  danger  of  sale,  forfeiture  or loss of any
Collateral or any interest therein; and (iii) such charge is adequately reserved
against in accordance with generally accepted accounting principles.

         (f) At its  option,  the  Bank may  discharge  taxes,  liens,  security
interests or other  encumbrances  at any time levied or placed on the Collateral
and may pay for the maintenance and  preservation of the Inventory.  The Company
agrees to  reimburse  the Bank upon demand for any  payment  made or any expense
incurred  (including  reasonable  attorneys'  fees) by the Bank  pursuant to the
foregoing  authorization.  Should the  Company  fail to pay said sum to the Bank
upon demand,  interest shall accrue thereon,  from the date of demand until paid
in full, at the highest rate set forth in any document or instrument  evidencing
any of the Obligations.

         (g) Upon the Bank's  request at any time or times,  the  Company  shall
assign and  deliver  to the Bank any  Collateral  and shall  furnish to the Bank
additional  collateral of value and character  satisfactory  to Bank as security
for the Obligations.

         11.7 Extensions and Compromises. With respect to any Collateral held by
the Bank as security of the  Obligations,  the Company assents to all extensions
or  postponements  of the time of  payment  thereof or any other  indulgence  in
connection therewith, to each substitution,

                                       16



exchange  or  release of  Collateral,  to the  addition  or release of any party
primarily or secondarily  liable,  to the acceptance of partial payments thereon
and to the settlement,  compromise or adjustment thereof, all in such manner and
at such time or times as the Bank may deem  advisable.  The Bank  shall  have no
duty as to the  collection or protection of Collateral or any income  therefrom,
nor as to the  preservation  of  rights  against  prior  parties,  nor as to the
preservation  of any  right  pertaining  thereto,  beyond  the safe  custody  of
Collateral in the possession of the Bank.

         11.8  Financing  Statements.  At the  request of the Bank,  the Company
shall join with the Bank in executing one or more financing statements in a form
satisfactory to the Bank and shall pay the cost of filing the same in all public
offices  wherever  filing is deemed by the Bank to be necessary or desirable.  A
carbon,  photographic or other  reproduction of this agreement or of a financing
statement shall be sufficient as a financing statement.

         11.9  Bank's  Appointment  as  Attorney-in-Fact.   The  Company  hereby
irrevocably  constitutes and appoints the Bank and any officer or agent thereof,
with  full   power  of   substitution,   as  the   Company's   true  and  lawful
attorney-in-fact  with full  irrevocable  power and  authority  in the place and
stead of the  Company  and in the name of the Company or in the Bank's own name,
from time to time in the Bank's discretion,  for the purpose of carrying out the
terms of this agreement,  to take any and all documents and instruments that may
be  necessary or desirable to  accomplish  the purposes of this  agreement  and,
without limiting the generality of the foregoing,  hereby grants to the Bank the
power and right,  on behalf of the Company,  without  notice to or assent by the
Company:

         (a)      To  execute,  file and record all such  financing  statements,
                  certificates  of title and other  certificates of registration
                  and operation and similar documents and instruments including,
                  but not  limited  to,  those  relating  to  aircraft or marine
                  vessels,  as the Bank  may  deem  necessary  or  desirable  to
                  protect, perfect and validate the Bank's security interest.

         (b)      Upon the  occurrence  and  continuance of any event of default
                  under Section 10 hereof, (i) to sign and indorse any invoices,
                  freight  or  express  bills,  bills  of  lading,   storage  or
                  warehouse  receipts,  drafts  against  debtors,   assignments,
                  verifications  and notices in  connection  with  accounts  and
                  other documents  relating to the Collateral;  (ii) to commence
                  and  prosecute  any  suits,  actions or  proceeding  at law in
                  equity in any court of competent  jurisdiction  to collect the
                  Collateral  or any part thereof and to enforce any other right
                  in respect of any Collateral; (iii) to defend any suit, action
                  or proceeding  brought against the Company with respect to any
                  Collateral;  (iv) to  settle,  compromise  or adjust any suit,
                  action  or  proceeding  described  above  and,  in  connection
                  therewith, to give such discharges or releases as the Bank may
                  deem  appropriate;  and  (v)  generally,  to  sell,  transfer,
                  pledge,  make any agreement  with respect to or otherwise deal
                  with any of the  Collateral as fully and  completely as though
                  the Bank were the absolute owner thereof for all purposes, and
                  to do, at the Bank's option and the Company's expense,  at any
                  time or from time to time,  all acts and things which the Bank
                  deems  necessary  to  protect,  preserve  or realize  upon the
                  Collateral and the Bank's security interest therein,  in order
                  to  effect  the  intent  of this  agreement,  all as fully and
                  effectively as the Company might do.

The Company hereby  ratifies all that said attorneys  shall lawfully do or cause
to be done by virtue  hereof.  This power of attorney is a power coupled with an
interest and shall be irrevocable.

         The powers  conferred upon the Bank hereunder are solely to protect its
interests  in the  Collateral  and  shall not  impose  and duty upon the Bank to
exercise any such powers.  The Bank shall be  accountable  only for amounts that
the Bank  actually  receives  as a result of the  exercise  of such  powers  and
neither the Bank nor any of its officers,  directors,  employees or agents shall
be  responsible  to the  Company  for any act of failure to act,  except for the
Bank's own gross negligence or willful misconduct.

                                       17



         11.10  Default.  If any event of default in the payments or performance
of any of the  Obligations  secured by this agreement or the  performance of any
covenant  contained  herein shall occur and be  continuing;  or if any warranty,
representations or statement made or furnished to the Bank by the Company proves
to have been false in any material respect when made or furnished:

         (a)      the Bank may,  at its option and without  notice,  declare the
                  unpaid  balance of any or all of the  Obligations  immediately
                  due  and  payable  and  this  agreement  and any or all of the
                  Obligations in default.

         (b)      All payments  received by the Company  under or in  connection
                  with any of the  Collateral  shall be held by the  Company  in
                  trust for the Bank,  shall be  segregated  from other funds of
                  the Company and shall forthwith upon receipt by the Company be
                  turned  over to the Bank in the same form as  received  by the
                  Company  (duly  indorsed  by  the  Company  to  the  Bank,  if
                  required).  Any and all such  payments so received by the Bank
                  (whether  from the  Company  or  otherwise)  may,  in the sole
                  discretion  of the  Bank,  be held by the  Bank as  collateral
                  security for, and/or then or at any time thereafter be applied
                  in whole or in part by the  Bank  against,  all or any part of
                  the  Obligations  in such  order as the Bank  may  elect.  Any
                  balance of such payments held by the Bank and remaining  after
                  payment in full of all the  Obligations  shall be paid over to
                  the  Company or to  whomsoever  may be  lawfully  entitled  to
                  receive the same.  Nothing set forth in this  subparagraph (b)
                  shall  authorize or be  construed to authorize  the Company to
                  sell or otherwise dispose of any Collateral except as provided
                  in Section 11.6 hereof.

         (c)      The Bank shall have the rights and remedies of a secured party
                  under this agreement,  under any other instrument or agreement
                  securing,  evidencing or relating to the Obligations and under
                  the law of the State of Ohio.  Without limiting the generality
                  of the  foregoing,  the  Bank  shall  have  the  right to take
                  possession of the Collateral and for that purpose the Bank may
                  enter upon,  with or without  breaking  into,  any premises on
                  which the  Collateral  or books and  records  relating  to the
                  Collateral  or any part thereof may be situated and remove the
                  same therefrom.  The Company  expressly  agrees that the Bank,
                  without demand of  performance or other demand,  advertisement
                  or notice of any kind (except the notices  specified  below of
                  time and place of public  sale or  disposition  or time  after
                  which a private  sale or  disposition  is to occur) to or upon
                  the  Company  or any other  person or entity  (all and each of
                  which  demands,   advertisements  and/or  notices  are  hereby
                  expressly waived), may forthwith collect, receive, appropriate
                  and realize upon the Collateral,  or any part thereof,  and/or
                  may forthwith sell, lease,  assign,  give option or options to
                  purchase  or sell or  otherwise  dispose  of and  deliver  the
                  Collateral (or contract to do so), or any part thereof, in one
                  or more parcels at public or private sales or sales, at any of
                  the Bank's offices or elsewhere at such prices as the Bank may
                  deem best, for cash or credit or for future  delivery  without
                  assumption  of any credit risk.  The Bank shall have the right
                  upon  any  such  public  sale or  sales,  and,  to the  extent
                  permitted  by law,  upon any such  private  sale or sales,  to
                  purchase the whole or any part of the Collateral so sold, free
                  of any right or  equity  of  redemption  in the  Company.  The
                  Company further agrees, at the Bank's request, to assemble the
                  Collateral and to make it available to the Bank at such places
                  as the Bank may  reasonably  select,  whether at the Company's
                  premises or elsewhere. The Company further agrees to allow the
                  Bank to use or occupy the Company's  premises  without charge,
                  for the purpose of effecting the Bank's remedies in respect of
                  the  Collateral.  The Bank shall apply the net proceeds of any
                  such collection, recovery, receipt, appropriation, realization
                  or sale,  after deducting all reasonable costs and expenses of
                  every kind incurred in  connection  therewith or incidental to
                  the care of  safekeeping of any or all of the Collateral or in
                  any  way  relating  to  the  rights  of  the  Bank  hereunder,
                  including  reasonable  attorneys' fees and legal expenses,  to
                  the  payment in whole or in part of the  Obligations,  in such
                  order as the Bank may

                                       18




                  elect,  and only after so paying  over such net  proceeds  and
                  after the payment by the Bank of any other amount  required by
                  any  provision  of law,  including  Ohio  Revised Code Section
                  1309.47(A)(3),  need the Bank account for the surplus, if any,
                  to the Company. To the extent permitted by applicable law, the
                  Company  waives all claims,  damages  and demands  against the
                  Bank  arising  out of the  repossession,  retention,  sale  or
                  disposition  of the  Collateral.  The Company  agrees that the
                  Bank  need not give  more  than  five (5) days  notice  (which
                  notification  shall  be  deemed  given  when  mailed,  postage
                  prepaid, addressed to the Company at the Company's address set
                  forth in Section 12.1 of this Agreement, or when telecopied or
                  telegraphed  to that address or when  telephoned  or otherwise
                  communicated orally to the Company or any agent of the Company
                  at that  address)  of the time and place of any public sale or
                  of the time after which a private sale may take place and that
                  such notice is reasonable  notification  of such matters.  The
                  Company shall remain liable for any deficiency if the proceeds
                  of any sale or disposition of the Collateral are  insufficient
                  to pay all amounts to which the Bank is entitled.  The Company
                  shall  also be liable for the costs of  collecting  any of the
                  Obligations  or otherwise  enforcing  the terms  thereof or of
                  this agreement including reasonable attorneys' fees.

         11.11  General.  Any  provision  of this  security  agreement  which is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining  provisions  hereof,  and any such  prohibition  or
unenforceability   in  any   jurisdiction   shall  not   invalidate   or  render
unenforceable  such provision in any other  jurisdiction.  The Bank shall not be
deemed to have waived any of its rights  hereunder or under any other agreement,
instrument  or paper signed by the Company  unless such waiver be in writing and
signed by the Bank.  No delay or omission on the part of the Bank in  exercising
any right shall operate as a waiver of such right or any other right. All of the
Bank's rights and remedies,  whether evidenced hereby or by any other agreement,
instrument  or paper,  shall be  cumulative  and may be exercised  singularly or
concurrently.

SECTION 12. MISCELLANEOUS.
- --------------------------

         12.1  Notices.

         (a) All communications under this Agreement or under the notes executed
pursuant  hereto shall be in writing and may be mailed by registered,  certified
or first class mail, postage prepaid,  transmitted via facsimile or delivered by
a recognized overnight courier service,

         (1)      if to the Bank,  at the  following  address,  or at such other
                  address as may have been  furnished  in writing to the Company
                  by the Bank:

                  The Huntington National Bank
                  105 West Fourth Street, Suite 400
                  Cincinnati, Ohio 45202
                  ATTN: Gene Fugate

         (2)      if to the Company,  at the following address, or at such other
                  address as may have been  furnished  in writing to the Bank by
                  the Company:

                  Superior Pharmaceutical Company
                  1385 Kemper Meadow Dr.
                  Cincinnati, Ohio 45240
                  ATTN: Eric Hagerstrand


                                       19




                  with a copy to:

                  DynaGen, Inc.
                  99 Erie Street
                  Boston, Massachusetts 02139
                  ATTN: President

         (b) Any notice so  addressed  and mailed by  registered,  certified  or
first class mail,  transmitted  by  facsimile  or  delivered  by such  overnight
courier  service,  shall be deemed to be given  when so mailed,  transmitted  or
delivered.

         12.2  Reproduction  of  Documents.  This  Agreement  and all  documents
relating  hereto  including,  without  limitation,  (a)  consents,  waivers  and
modification which may hereafter be executed, (b) documents received by the Bank
at the closing or otherwise,  and (c)  financial  statements,  certificates  and
other  information  previously  or  hereafter  furnished  to  the  Bank,  may be
reproduced by the Bank by any photographic,  photostatic, microfilm, micro-card,
miniature  photographic  or other  similar  process and the Bank may destroy any
original document so reproduced. The Company agrees and stipulates that any such
reproduction  shall be  admissible  in  evidence as the  original  itself in any
judicial  or  administrative  proceeding  (whether  or not  the  original  is in
existence  and  whether  or not  such  reproduction  was made by the Bank in the
regular  course of  business)  and that any  enlargement,  facsimile  or further
reproduction of such reproduction shall be likewise be admissible in evidence.

         12.3 Survival. All warranties,  representations,  and covenants made by
the Company herein or on any certificate or other instrument  delivered by it or
on its behalf under this Agreement  shall be considered to have been relied upon
by the Bank  and  shall  survive  the  closing  of the  Loan  regardless  of any
investigation  made by the  Bank  on its  behalf.  All  statements  in any  such
certificate or other instrument shall constitute  warranties and representations
by the Company.

         12.4 Successors and Assigns.  This Agreement shall inure to the benefit
of and be binding upon the heirs, successors and assigns of each of the parties.

         12.5  Amendment  and Waiver.  This  Agreement  may be amended,  and the
observance of any term of this Agreement may be waived, with (and only with) the
written consent of the Company and the Bank.

         12.6  Duplicate  Originals.  Two or more  duplicate  originals  of this
Agreement  may be signed by the parties,  each of which shall be an original but
all of which together shall constitute one and the same instrument.

         12.7  Termination.  This Agreement may be terminated by either party by
written  notice to the  other  party  that no  further  advances  are to be made
hereunder  and upon  the  Company  thereafter  paying  in full  all  outstanding
advances made  pursuant to this  Agreement,  all accrued  interest and all other
obligations and indebtedness of the Company to the Bank arising  hereunder or in
connection herewith.

         12.8 Governing Law and Venue.  This Agreement  shall be governed by and
construed in accordance with the laws of the State of Ohio. Any action commenced
for the  enforcement  of any provision  contained in, or otherwise in connection
with, this Agreement, shall be commenced in a court of competent jurisdiction in
Cincinnati,  Ohio, and the parties hereto irrevocably submit to the jurisdiction
of such court and waive the right to dispute such venue.


                                       20



         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the day and year first written above.


The Huntington National Bank


By: [ILLEGIBLE]
   --------------------------------

Its: Vice President
    -------------------------------

Superior Pharmaceutical Company


By: /s/ Dennis Smith
   --------------------------------

Its: CEO/PRESIDENT
    -------------------------------


By: /s/ Eric C. Hagerstrand
   --------------------------------

Its:  Chairman, Vice President
    -------------------------------



                           CONSENT, ACKNOWLEDGMENT AND
                             AGREEMENT OF GUARANTOR

         The Guarantor  hereby consents to the terms and conditions set forth in
the  foregoing  Agreement,  and  further  agrees to comply with and abide by the
provisions  contained in  Subsections  8.9, 8.21 and  Paragraphs  (k) and (l) of
Subsection 10.1.

GUARANTOR:

DYNAGEN, INC.


By:  /s/  Dhananjay G. Wadekar
   --------------------------------

Its:  Executive Vice President
    -------------------------------





                                       21


            
                                                                    EXHIBIT 99.4
                                                                    ------------

- --------------------------------------------------------------------------------
GUARANTOR                                        DEBTOR:
DYNAGEN, INC.                                    SUPERIOR PHARMACEUTICAL COMPANY
99 ERIE STREET                                   1385 KEMPER MEADOW ROAD
CAMBRIDGE, MASSACHUSETTS 02139                   CINCINNATI, OHIO 45240
- --------------------------------------------------------------------------------

CONTINUING GUARANTY
UNLIMITED

For the purpose of inducing The Huntington  National Bank (hereinafter  referred
to as "Bank") to lend  money or advance  credit to, or renew,  extend or forbear
from demanding  immediate payment of the Obligations of SUPERIOR  PHARMACEUTICAL
COMPANY  (hereinafter  referred to as "Debtor"),  the  undersigned  (hereinafter
referred to as "Guarantors"  whether one or more), jointly and severally if more
than one (which joint and several  liability  shall exist  regardless of whether
additional  Guarantors  have  evidenced  or  may in the  future  evidence  their
undertaking  by executing this  Guaranty,  by co-signing one or more  promissory
notes or other  instruments of  indebtedness,  by executing one or more separate
agreements of guaranty of any or all of the Obligations  referred to herein,  or
otherwise), hereby unconditionally guarantee the prompt and full payment to Bank
when due,  whether by acceleration or otherwise,  of all Obligations of any kind
for which Debtor is now or may hereafter become liable to Bank in any manner.

The word  "Obligations"  is used in its most  comprehensive  sense and includes,
without  limitation,   all  indebtedness,   debts  and  liabilities   (including
principal,  interest,  late charges,  collection costs,  attorneys' fees and the
like) of Debtor to Bank, either created by Debtor alone or together with another
or others, primary or secondary,  secured or unsecured,  absolute or contingent,
liquidated  or  unliquidated,  direct or  indirect,  whether  evidenced by note,
draft,  application  for letter of credit,  agreements of guaranty or otherwise,
and any and all renewals of,  extensions of or  substitutes  therefor.  The word
"Obligations"  shall include,  BUT NOT BE LIMITED TO, all  indebtedness  owed by
Debtor to Bank by reason of credit  extended  or to be extended to Debtor in the
principal  amount  of  $9,000,000.00,  pursuant  to one or more  instruments  of
indebtedness and related loan documents.

Guarantors,  and  each  of  them,  hereby  promise  that  if one or  more of the
Obligations  are not paid promptly when due, they, and each of them,  will, upon
request of Bank, pay the Obligations to Bank, irrespective of any action or lack
of  action  on  Bank's  part in  connection  with the  acquisition,  perfection,
possession,  enforcement or disposition of any or all  Obligations or any or all
security  therefor or otherwise,  and further  irrespective of any invalidity in
any or all  Obligations,  the  unenforceability  thereof  or the  insufficiency,
invalidity or unenforceability of any security therefor.

Guarantors  waive  notice  of any and all  acceptances  of this  Guaranty.  This
Guaranty is a  continuing  guaranty,  and,  in addition to covering  all present
Obligations of Debtor to Bank,  will extend to all future  Obligations of Debtor
to Bank, and this whether such Obligations are reduced or entirely  extinguished
and thereafter increased or reincurred. This Guaranty is made and will remain in
effect as to any and all  Obligations  of Debtor  incurred  or arising  prior to
receipt by the loan  officer of Bank who is  handling  Debtor's  Obligations  of
written notice of termination  of this Guaranty.  No revocation  will in any way
affect the duties of  Guarantors to Bank with respect to  Obligations  of Debtor
incurred  prior to the  receipt  of such  notice by such loan  officer  of Bank.
Revocation  by any one or more of  Guarantors  will not affect the duties of the
remaining Guarantor or Guarantors.






Guarantors waive presentment,  demand, protest, notice of protest, and notice of
dishonor or other nonpayment of any and all Obligations and further waive notice
of sale or other disposition of any collateral or security now held or hereafter
acquired by Bank.  Guarantors  agree that no extension  of time,  whether one or
more, nor any other indulgence  granted by Bank to Debtor, or to Guarantors,  or
any of them,  and no omission or delay on Bank's  part in  exercising  any right
against,  or in taking  any  action to collect  from or pursue  Bank's  remedies
against Debtor or Guarantors, or any of them, will release,  discharge or modify
the duties of Guarantors.  Guarantors  agree that Bank may, without notice to or
further consent from Guarantors,  release or modify any collateral,  security or
other  guaranties,  and no such action  will  release,  discharge  or modify the
duties of Guarantors  hereunder.  Guarantors further agree that Bank will not be
required to pursue or exhaust any of its rights or  remedies  against  Debtor or
Guarantors,  or any of them, with respect to payment of any of the  Obligations,
or to pursue,  exhaust or preserve any of its rights or remedies with respect to
any collateral, security or other guaranties given to secure the Obligations, or
to take any action of any sort, prior to demanding  payment from or pursuing its
remedies against Guarantors.

Guarantors  agree to furnish true and complete  financial  statements (a) within
forty  five  (45)  days  after  the  end of  each  calendar  quarter,  financial
statements contained in Guarantor's  quarterly reports in Form 10-Q, including a
balance sheet and  statements of income and surplus,  certified by the president
or chief  financial  officer  of the  undersigned  as  fairly  representing  the
undersigned's financial condition as of the end of such period; (b) within forty
five (45) days after the end of each  calendar  quarter  and at such other times
reasonably  requested  by Bank,  a statement  signed by the  president  or chief
financial   officer  of  the  undersigned   setting  forth  and  certifying  the
calculation of the Borrowing  Base as of the end of that period;  (c) within one
hundred  twenty (120) days of the end of each fiscal year, an audited  financial
statement prepared in accordance with generally accepted  accounting  principles
consistently applied by independent public accountants satisfactory to the Bank,
containing a balance  sheet,  statements  of income and surplus,  statements  of
source and use of funds and  reconciliation of capital accounts,  along with any
management  letters written by such  accountants;  (d) immediately upon becoming
aware of the existence of any condition or event which  constitutes  an Event of
Default,  a written notice specifying the nature and period of existence thereof
and what  action the  undersigned  is taking or  proposes  to take with  respect
thereto;  (e) at the request of the Bank, such other information as the Bank may
from time to time  reasonably  require,  and agree that  failure to furnish such
financial  statements  may  constitute  or be deemed to  constitute a default or
event of  default of the  Obligations.  Guarantors  agree  that any legal  suit,
action  or  proceeding  arising  out of or  relating  to  this  Guaranty  may be
instituted  in  a  state  or  federal  court  of   appropriate   subject  matter
jurisdiction  in the State of Ohio;  waive any objection which they may have now
or  hereafter  to  the  venue  of any  such  suit,  action  or  proceeding;  and
irrevocably  submit  to the  jurisdiction  of any such  court in any such  suit,
action or proceeding.

Guarantors hereby authorize any attorney at law to appear for them in any action
on any or all Obligations  guaranteed  hereby at any time after such Obligations
become due,  whether by acceleration or otherwise,  in any court of record in or
of the State of Ohio or  elsewhere,  to waive the issuing and service of process
against,  and confess judgment against  Guarantors,  or any of them, in favor of
Bank  for  the  amount  that  may be  due,  including  interest,  late  charges,
collection  costs,  attorneys'  fees  and  the  like  as  provided  for in  said
Obligations,  and costs of suit,  and to waive and  release  all  errors in said
proceedings and judgments, and all petitions in error, and right of appeal




from the judgments rendered. No such judgment or judgments against less than all
of Guarantors shall be a bar to a subsequent  judgment or judgments  against any
one or more of Guarantors  against whom  judgment has not been obtained  hereon,
this being a joint and several warrant of attorney to confess judgment.

If any Obligation of Debtor is assigned by Bank, this Guaranty will inure to the
benefit of Bank's assignee,  and to the benefit of any subsequent  assignee,  to
the extent of the assignment or  assignments,  provided that no assignment  will
operate to relieve  Guarantors,  or any of them, from any duty to Bank hereunder
with respect to any unassigned Obligation.  In the event that any one or more of
the provisions  contained in this Guaranty or any  application  thereof shall be
determined to be invalid, illegal or unenforceable in any respect, the validity,
legality and enforceability of the remaining provisions contained herein and any
other applications thereof shall not in any way be affected or impaired thereby.
This  Guaranty  shall be  construed in  accordance  with the law of the State of
Ohio.  As  security  for  payment  by  Guarantors  hereunder,  and of all  other
liabilities of Guarantors to Bank whether now existing or hereafter arising,

Guarantors hereby grant Bank a security interest in the following property:

   N/A
- --------------------------------------------------------------------------------

whether  Guarantors'  interest therein as owner,  co-owner,  lessee,  consignee,
secured  party or  otherwise  be now owned or existing or  hereafter  arising or
acquired, and wherever located,  together with all substitutions,  replacements,
additions and accessions  therefor or thereto,  all replacement and repair parts
therefor,  all negotiable  documents relating thereto,  all products thereof and
any and all cash and non-cash  proceeds  thereof  including,  but not limited to
notes,  drafts,  checks,  instruments and insurance  proceeds  (hereinafter  the
"Collateral").  If at the time of payment of the  Obligations  and any discharge
hereof,  Guarantors  shall be then  directly or  contingently  liable to Bank as
maker, indorser, surety or guarantor of any other loan or obligation whether the
same shall be  evidenced by a note,  bill of exchange,  agreement of guaranty or
other  instrument,  then Bank may  continue to hold the  Collateral  as security
therefor,  even though this Guaranty shall have been  surrendered to Guarantors.
Bank shall not be bound to take any steps  necessary  to preserve  any rights in
the Collateral against prior parties. If any Obligations  hereunder are not paid
when  due,  Bank  may,  at its  option,  demand,  sue for,  collect  or make any
compromise or settlement it deems  desirable with  reference to the  Collateral,
and shall have the rights of a secured party under the law of the State of Ohio.
Guarantors shall be liable for any deficiency.

WARNING  - BY  SIGNING  THIS  PAPER YOU GIVE UP YOUR  RIGHT TO NOTICE  AND COURT
TRIAL.  IF YOU DO NOT PAY ON TIME A COURT  JUDGMENT  MAY BE  TAKEN  AGAINST  YOU
WITHOUT  YOUR PRIOR  KNOWLEDGE  AND THE POWERS OF A COURT CAN BE USED TO COLLECT
FROM YOU REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR  WHETHER FOR
RETURNED GOODS, FAULTY GOODS,  FAILURE ON HIS PART TO COMPLY WITH THE AGREEMENT,
OR ANY OTHER CAUSE.

Executed and delivered at CINCINNATI, OHIO on June 18, 1997.
                          ----------------    -------------

GUARANTOR:

DYNAGEN, INC.,
A DELAWARE CORPORATION


BY:      /s/  Dhananjay G. Wadekar
    ------------------------------------
NAME:         Dhananjay G. Wadekar
    ------------------------------------
TITLE:    Executive Vice President
    ------------------------------------






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