SYMBOLLON CORP
10QSB, 1997-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                    U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  Form 10-QSB

(Mark One)
|X|      QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
         ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1997
| |      TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ______ TO ________

Commission file number  0-22872
                       ---------

                              SYMBOLLON CORPORATION
- -------------------------------------------------------------------------------
       (Exact name of small business issuer as specified in its charter)

            Delaware                            36-3463683
- -------------------------------            ------------------------
(State or other jurisdiction of              (I.R.S. Employer
incorporation or organization)              Identification No.)

                    37 Loring Drive, Framingham, MA 01702
- -------------------------------------------------------------------------------
                    (Address of principal executive offices)

                                  508-620-7676
- -------------------------------------------------------------------------------
                (Issuer's telephone number, including area code)

                    122 Boston Post Road, Sudbury, MA 01776
- -------------------------------------------------------------------------------
        (Former name, former address and former fiscal year, if changed
                               since last report)

Check  whether the issuer (1) filed all reports  required to be filed by Section
13 or 15(d) of the  Exchange  Act during the past 12 months (or for such shorter
period that the registrant was required to file such reports),  and (2) has been
subject to such filing requirements for the past 90 days. Yes X No

State the number of shares outstanding of each of the issuer's classes of common
equity, as of the latest practicable date.

                                     August 13, 1997
                                    -----------------
        Class A Common Stock            3,181,278
        Class B Common Stock               15,738

Transitional Small Business Disclosure Format (check one):

                    Yes             No    X
                        --------       --------

<PAGE>

                              SYMBOLLON CORPORATION
                          (a development stage company)

                                      INDEX

                                                                           PAGE
PART I.  FINANCIAL INFORMATION

         Item 1.  Financial Statements

                  Unaudited Condensed Balance Sheets
                    - June 30, 1997 and December 31, 1996                    1

                  Unaudited Condensed Statements of Operations  and Deficit
                    Accumulated  During the  Development  Stage - For the
                    six and three months ended June 30, 1997 and June 30,
                    1996                                                     2

                  UnauditedCondensed  Statements  of  Cash  Flows
                    - For the six months ended June 30, 1997
                    and June 30, 1996                                        3

                  Notes to the Unaudited Condensed Financial Statements      4

         Item 2.  Management's Discussion and Analysis
                    or Plan of Operation                                     6

PART II.  OTHER INFORMATION

         Item 4.  Submission of Matters to a Vote of Security Holders        8

         Item 5.  Other Information                                          8

         Item 6.  Exhibits and Reports on Form 8-K                           9

SIGNATURE                                                                   10

INDEX TO EXHIBITS                                                           11


<PAGE>

                        Part I - Financial Information

Item 1 - Financial Statements
<TABLE>

                             SYMBOLLON CORPORATION
                         (a development stage company)

                            CONDENSED BALANCE SHEETS
                                   (Unaudited)

                                     ASSETS
<CAPTION>
                                                                            June 30,        December 31,
                                                                              1997              1996
                                                                          -------------     ------------
Current assets:
<S>                                                                        <C>               <C>
  Cash and cash equivalents............................................... $ 1,724,648      $ 1,707,099
  Accounts receivable.....................................................     142,066           50,406
  Inventory...............................................................      15,672           17,818
  Prepaid expenses........................................................      36,438           82,439
                                                                           -----------      -----------
        Total current assets.............................................. $ 1,918,824      $ 1,857,762

Equipment and leasehold improvements, net of
 accumulated depreciation.................................................      97,114          124,463
Other assets:
    Patent and trademark cost, net of accumulated amortization............     136,770          127,097
Deposit...................................................................       5,000            5,000
                                                                          ------------      -----------
        TOTAL............................................................. $ 2,157,708      $ 2,114,322
                                                                          ============      ===========

                                   LIABILITIES
Current liabilities:
  Accounts payable........................................................ $    21,477      $    41,173
  Notes payable...........................................................     492,500
  Legal fees payable to related party.....................................       5,377           30,676
  Other accrued professional fees.........................................      45,365           53,234
  Deferred revenue........................................................                       17,596
  Other current liabilities...............................................       8,083           14,441
                                                                          ------------      -----------
        Total current liabilities.........................................     572,802          157,120

Accrued rent..............................................................       4,666           14,000
                                                                          ------------      -----------
        Total liabilities.................................................     577,468          171,120
                                                                          ------------      -----------

                               STOCKHOLDERS' EQUITY

Preferred  stock,  par  value  $.001  per  share,  5,000,000  shares  authorized
 Convertible Preferred Stock, Series A, $.001 par value, 444,444 shares
 issued at December 31, 1996 (liquidation preference $500,000)............                          444
Common stock, Class A, par value $.001 per share,
 18,750,000 shares authorized, 1,288,253 and 2,914,611 shares issued at
 December 31, 1996 and June 30, 1997, respectively........................       2,915            1,288
Common stock, Class B, par value $.001 per share,
 1,250,000 shares authorized, 1,196,275 and 15,738 shares issued at December 31,
 1996 and June 30, 1997, respectively,
 each convertible into one share of Class A common stock..................          16            1,196
Additional paid-in capital................................................   7,275,417        7,273,353
Deficit accumulated during the development stage..........................  (5,698,108)      (5,333,079)
                                                                          ------------      -----------
     Total stockholders' equity...........................................   1,580,240        1,943,202
                                                                          ------------      -----------

        TOTAL............................................................. $ 2,157,708      $ 2,114,322
                                                                          ============      ===========
</TABLE>

See notes to condensed financial statements.

                                        1



<PAGE>


<TABLE>

                             SYMBOLLON CORPORATION
                          (a development stage company)

           CONDENSED STATEMENTS OF OPERATIONS AND DEFICIT ACCUMULATED
                          DURING THE DEVELOPMENT STAGE
                                  (Unaudited)
<CAPTION>
                                                                                                               Period From
                                                                                                              July 15, 1986
                                                        Three Months Ended            Six Months Ended       (Inception) to
                                                              June 30,                    June 30,              June 30,
                                                         1997         1996           1997          1996           1997
                                                     -----------   -----------    -----------   -----------    -----------
<S>                                                  <C>           <C>            <C>           <C>            <C>
Net sales.........................................   $   162,338   $     3,447    $   162,338   $    16,732    $   403,225
Contract revenue..................................         8,250        82,587         48,587        82,587        518,578
License fee.......................................                     500,000                      500,000        540,000
                                                     -----------   -----------    -----------   -----------    -----------
        Total income..............................       170,588       586,034        210,925       599,319      1,461,803

Operating Expenses:
    Manufacturing costs...........................   $    86,021   $     6,653    $    86,021   $    13,514    $   259,727
    Research and development costs................       134,873       307,014        283,189       652,335      3,757,527
    General and administrative expenses...........       114,897       209,027        239,168       450,691      3,221,877
                                                     -----------   -----------    -----------   -----------    -----------
        Total operating expenses..................       335,791       522,694        608,378     1,116,540      7,239,131
                                                     -----------   -----------    -----------   -----------    -----------

Income (Loss) from operations.....................      (165,203)       63,340      (397,453)      (517,221)    (5,777,328)

Interest income...................................        21,438        22,296         40,987        46,172        427,819

Interest expense and debt issuance costs..........        (8,213)         (831)        (8,563)       (1,660)      (348,599)
                                                     -----------   -----------    -----------   -----------    -----------

NET INCOME (LOSS).................................      (151,978)       84,805       (365,029)     (472,709)    (5,698,108)

Deficit accumulated during the development stage,
 beginning of period..............................    (5,546,130)   (4,961,882)    (5,333,079)   (4,427,664)
                                                     -----------   -----------    -----------   -----------    -----------
Deficit accumulated during the development stage,
 end of period....................................   $(5,698,108)  $(4,877,077)   $(5,698,108)  $(4,900,373)   $(5,698,108)
                                                     ===========   ===========    ===========   ===========    ===========

NET INCOME (LOSS) PER SHARE OF
 COMMON STOCK.....................................   $     (0.07)  $      0.05    $     (0.19)  $     (0.27)
                                                     ===========   ===========    ===========   ===========

Weighted average number of common
 shares outstanding...............................     2,083,253     1,780,136      1,885,203     1,780,136
                                                     ===========   ===========    ===========   ===========
</TABLE>

See notes to condensed financial statements.

                                       2

<PAGE>


<TABLE>
                             SYMBOLLON CORPORATION
                         (a development stage company)

                       CONDENSED STATEMENTS OF CASH FLOWS
                                  (Unaudited)
<CAPTION>
                                                                                           Period From
                                                                                          July 15, 1986
                                                                 Six Months Ended        (Inception) to
                                                                     June 30,               June 30,
                                                                1997          1996           1997
                                                             -----------   -----------    -----------
<S>                                                          <C>           <C>            <C>
Cash flows from operating activities:
    Net loss..............................................   $  (365,029)  $  (472,709)   $(5,698,108)
    Adjustments  to  reconcile  net  loss to net
    cash  provided  by  (used  in) operating activities:
      Depreciation and amortization expense...............        14,835        30,004        334,360
      Amortization of debt issuance costs.................                                    130,000
      Accrued rent........................................        (9,333)       (4,500)         4,667
      Changes in operating assets and liabilities:
        Accounts receivable...............................       (91,660)       10,382       (142,066)
        Inventory.........................................         2,146       (18,037)       (15,672)
        Prepaid expenses..................................        46,001        17,633        (36,438)
        Deferred revenue..................................       (17,596)
        Accounts payable and other current liabilities....       (59,222)      179,075        137,477
                                                             -----------   -----------    -----------
        Net cash used in
        operating activities..............................      (479,858)     (258,152)    (5,285,780)
                                                             -----------   -----------    -----------
Cash flows from investing activities:
    Equipment and leasehold improvements costs............        15,907        (4,406)      (239,413)
    Patent and trademark costs............................       (13,066)      (37,425)      (328,831)
    Deposit...............................................                                     (5,000)
                                                             -----------   -----------    -----------
      Net cash used in investing activities...............         2,841       (41,831)      (573,244)
                                                             -----------   -----------    -----------
Cash flows from financing activities:
    Notes Payable.........................................       492,500                      492,500
    Warrant conversion....................................                                    629,204
    Borrowings from stockholders..........................                                    253,623
    Repayment to stockholders.............................                                   (127,683)
    Sale of common stock and units........................         2,066         6,552      7,229,430
    Sale of preferred stock...............................                                    450,000
    Sale of option to purchase units......................                                        100
    Public offering costs.................................                                 (1,343,502)
                                                             -----------   -----------    -----------
      Net cash provided by
      financing activities................................       494,566         6,552      7,583,672
                                                             -----------   -----------    -----------
NET INCREASE (DECREASE) IN CASH...........................        17,549      (293,431)     1,724,648
Cash at beginning of period...............................     1,707,099     2,087,753
                                                             -----------   -----------    -----------
CASH AT END OF PERIOD.....................................   $ 1,724,648   $ 1,794,322    $ 1,724,648
                                                             ===========   ===========    ===========
</TABLE>

See notes to condensed financial statements.

                                      3

<PAGE>



                                               SYMBOLLON CORPORATION
                                           (a development stage company)

                                      NOTES TO CONDENSED FINANCIAL STATEMENTS
                                                    (Unaudited)

Note A - Description of Business:

         Symbollon Corporation (the "Company") was originally incorporated as an
Illinois  corporation  on July 15,  1986 as  Symbollon,  Inc.  On May 21,  1991,
Symbollon,   Inc.  was  merged  into  Symbollon  Corporation,   a  newly  formed
Massachusetts corporation (which was subsequently  reincorporated in Delaware in
August 1993),  to carry on the business of Symbollon Inc. Except where otherwise
indicated,  references to the Company in these  financial  statements  and notes
thereto include the activities of Symbollon, Inc.

         The  Company  was  formed  to  develop  and  commercialize  proprietary
iodine-based  products for infection  control and  treatment in  biomedical  and
bioagricultural industries.

         The Company is in the development stage and its efforts since inception
have been principally  devoted to research and development,  securing patent and
trademark  protection and raising  capital.  In connection with its research and
development efforts, several grants under the Small Business Innovation Research
("SBIR")  program   concerning  the  Company's   technology  have  been  funded.
Management of the Company anticipates that additional losses will be incurred as
these efforts are pursued.  In 1995,  the Company  signed a marketing and supply
agreement for its first product and commenced shipping.

Note B - Accounting Policies and Disclosure:

         The accompanying  unaudited financial  statements do not contain all of
the disclosures required by generally accepted accounting  principles and should
be read in conjunction with the financial  statements and related notes included
in the Company's Form 10-KSB for the year ended December 31, 1996 filed with the
Securities and Exchange Commission.

         In the opinion of  management,  the  financial  statements  reflect all
adjustments,  all of which are of a normal recurring  nature,  to fairly present
the Company's  financial  position,  results of operations  and cash flows.  The
results of operations  for the six and  three-month  periods ended June 30, 1997
are not necessarily indicative of the results to be expected for the full year.

Note C - Line of Credit:

         During the first  quarter of 1997 the  Company  established  a $500,000
line of credit with Silicon  Valley  Bank.  The line of credit is secured by the
Company's  assets  and  contains  various  restrictive  covenants,  including  a
restriction on dividends.  The line of credit has an interest rate of prime plus
1 1/2% and expires in one year.



<PAGE>


Note D - Capitalization:

         In May 1997, the holders of the 444,444  outstanding shares of Series A
Preferred Stock converted those shares into an equal number of shares of Class A
Common Stock.

         The Company  sold  266,667  shares of Class A Common  Stock to Bausch &
Lomb  Pharmaceuticals,  Inc.  in a  private  placement  on  August  4,  1997 for
$500,000,  in conjunction  with entering into a collaboration  and  sale/license
agreement  with the Company (see Part II - Item 5. "Other  Information"  below).
The shares are subject to certain  voting and transfer  restrictions  and may be
redeemed at cost at the option of either the Company or the purchaser.


<PAGE>


Item 2.  Management's Discussion and Analysis or Plan of Operation

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
AND RESULTS OF OPERATIONS

         The Company is a  development  stage  company.  Since  inception of the
Company's  predecessor  in 1986,  the  Company's  efforts have been  principally
devoted to research and  development,  securing patent and trademark  protection
and raising capital,  most of which efforts commenced after May 1991. Except for
revenue  earned since 1995 on sales of IodoZyme,  the Company's  sole revenue to
date has been from research and  development  contracts with corporate  partners
and interest income.

Forward-Looking Statements

         Any  statements  set forth below or otherwise made in writing or orally
by the Company with regard to its expectations as to financial results and other
aspects of its business may  constitute  forward-looking  statements  within the
meaning of the Private  Securities  Litigation Reform Act of 1995.  Although the
Company  makes such  statements  based on  assumptions  which it  believes to be
reasonable, the Company's business is subject to significant risks and there can
be no  assurance  that  actual  results  will  not  differ  materially  from the
Company's expectations. Accordingly, the Company hereby identifies the following
important  factors,  among others,  which could cause its results to differ from
any results which might be projected,  forecasted or estimated by the Company in
any such forward-looking  statements:  (i) the timely development and acceptance
of new products,  (ii) the achievement of product development  milestones by the
Company's corporate partners,  (iii) the timely receipt of regulatory clearances
required to market the Company's proposed  products,  (iv) the continued sale of
IodoZyme,  the Company's  only product,  and (v) the Company's  ability to enter
into new arrangements with corporate partners.

Results of Operations

         Symbollon's net loss for the three month period ended June 30, 1997 was
$151,978, reflecting an increase of $236,783 from a net income of $84,805 in the
comparable 1996 period. Symbollon's net loss for the six month period ended June
30, 1997 was  $365,029,  reflecting  a decrease  of $107,680  from a net loss of
$472,709 in the comparable  1996 period.  The increased loss for the three-month
period resulted primarily from decreased license  fees/contract  revenues from a
research  and  development  contract  signed  in the  second  quarter  of  1996,
partially  offset by decreased  expenses and  increased  product  revenues.  The
decreased  loss for the  six-month  period  resulted  primarily  from  decreased
expenses and increased product  revenues,  partially offset by decreased license
fees/contract  revenues.  The Company  expects to  continue  to incur  operating
losses for the foreseeable future.

         Product  revenues  from sales of IodoZyme  for the three and  six-month
periods  ended June 30, 1997 were  $162,338,  reflecting an increase of $158,891
and  $145,606,  respectively,  from the  product  sales in the  comparable  1996
periods.  The increased  sales  reflect in part the  Company's  efforts with its
marketing partner,  West Agro, Inc., to broaden the distribution of the product.

<PAGE>

At June 30, 1997,  Symbollon's  backlog for IodoZyme was approximately  $210,000
which is expected to be satisfied during the third quarter.

         The gross profit  margin on product  sales for the three and  six-month
periods ended June 30, 1997 were 47%, compared to (93%) and 19.2%, respectively,
in the  comparable  1996  periods.  The increase in the gross  profit  margin on
product  sales for the three and  six-month  periods  ended  June 30,  1997 were
primarily due to increased sales volume.

         Contract  revenues for the three and  six-month  periods ended June 30,
1997 were $8,250,  and $48,587,  respectively,  reflecting a decrease of $74,337
and $34,000,  respectively,  from the contract  revenues in the comparable  1996
periods.  License fees for the three and  six-month  periods ended June 30, 1997
were none,  reflecting  a decrease  of  $500,000  from the  license  fees in the
comparable  1996 periods.  The contract  revenues and license fees  generated in
both fiscal 1996 and 1997 relate to one corporate  relationship  entered into in
May 1996 in the field of dermatology.

         Research and development  expenses for the three and six-month  periods
ended June 30, 1997 were  $134,873  and  $283,189,  respectively,  reflecting  a
decrease  of  $172,141  and  $369,146,   respectively,  from  the  research  and
development expenses in the comparable 1996 periods. The decreases resulted from
decreases in labor costs  associated  with a reduction in the work force and the
discontinuation of the development  expenses,  including third party testing and
consultant  fees,  related  to the  preparation  of the 510(k)  filing  with the
Federal  Food  and  Drug  Administration   covering  the  Company's  high  level
disinfectant formulation, which has been abandoned.

         General and administrative expenses for the three and six-month periods
ended June 30, 1997 were  $114,897  and  $239,168,  respectively,  reflecting  a
decrease  of  $94,130  and   $211,523,   respectively,   from  the  general  and
administrative  expenses in the comparable 1996 periods.  The decreases resulted
primarily  from  decreased  legal fees,  insurance  costs and director fees. The
Company  anticipates  that general and  administrative  expenses  will remain at
current levels for the remainder of 1997.

Liquidity and Capital Resources

         The Company has funded its  activities  through  proceeds  from Class A
Warrant exercises,  its initial public offering and private placements of equity
and debt securities and through loans from principal  stockholders and its bank.
Independent   research  and  development   activities  regarding  the  Company's
technology  has been funded  through SBIR grants  received and  administered  by
Biomedical  Development  Corporation.  As of March 31,  1997,  the  Company  had
working capital of $1,346,022.

         The  Company  has  had  no  significant  revenue  and  has  incurred  a
cumulative  loss  through  June 30,  1997 of  $5,698,108.  However,  the Company
believes that it has the necessary  liquidity  and capital  resources,  together
with anticipated  future revenues,  to sustain planned operations for the twelve
months  following  June 30,  1997.  In the  event  that the  Company's  internal
estimates  relating to its planned  revenues or  expenditures  prove  materially
inaccurate,  the Company may be required to  reallocate  funds among its planned

<PAGE>

activities and curtail certain planned  expenditures.  In any event, the Company
anticipates that it will require additional funds after June 30, 1998.

         During  the  remainder  of  1997,   the  Company   anticipates   paying
approximately  $140,000 as compensation for its current executive officers,  and
approximately  $20,150 for lease  payments on its  facilities.  Planned  capital
expenditures for the remainder of 1997 are expected to be approximately  $20,000
for manufacturing  equipment and $60,000 for leasehold  improvements  related to
the move to a new corporate headquarters. At December 31,1996, the Company had a
net operating loss carryforward for Federal income tax purposes of approximately
$5,010,000 expiring through 2011.


Part II - Other Information

Item 4.  Submission of Matters to a Vote of Security Holders

         The following items were submitted to a vote of the stockholders at the
Company's Annual Meeting on May 14, 1997:

         1.  Election of Directors.  The following directors were elected:

                                                       Votes 
                                         For           Against   Withheld
                                         ---           -------   --------
                  James C. Richards   2,752,461         3,490        0
                  Jack H. Kessler     2,752,461         3,490        0
                  Paul C. Desjourdy   2,752,461         3,490        0
                  Edward A. Mason     2,752,461         3,490        0
                  Stuart M. Paley     2,752,461         3,490        0

         2.  Ratification  of Richard A.Eisner  &  Company,  LLP as
the independent auditors of the Company:

                                                       Votes
                                        For           Against   Withheld
                                        ---           -------   -------- 
                                      2,753,361        2,490       100

         Each  item  identified  above  was  described  in the  Company's  Proxy
Statement  for the  Annual  Meeting  of  Stockholders.  Each item  received  the
necessary votes for approval.

Item 5. Other Information

         The  Company   entered  into  a  five-year   lease  for  new  corporate
headquarters  located in Framingham,  Massachusetts.  Pursuant to the lease, the
Company  has  agreed  to  pay  the  landlord   $50,000  for  certain   leasehold
improvements  to the 5,400  square foot  facility.  The Company has an option to
extend the lease for an additional five years.


<PAGE>


         On August  4,  1997,  the  Company  entered  into a  collaboration  and
sale/license  agreement  with  Bausch & Lomb  Pharmaceuticals,  Inc.  Under  the
Collaboration  and  Sale/License  Agreement,   the  parties  intend  to  develop
ophthalmic  products  based  on  Symbollon's  proprietary   enzyme-based  iodine
technology.  Bausch & Lomb  obtained  exclusive  marketing  rights in the United
States  and  Canada  for  ophthalmic   products  that  are  developed  based  on
Symbollon's  iodine  technology.  The agreement also provides Bausch & Lomb with
options to broaden  its  exclusive  marketing  rights to include the rest of the
world,  and to  include  otic (ear)  products.  So long as the  agreement  is in
effect,  Bausch & Lomb will make a series of  milestone  payments  to  Symbollon
based on the passage of time or the occurrence of certain  events,  plus royalty
payments on product sales and reimbursement of Symbollon's  development  efforts
under the agreement.

         In conjunction with the Collaboration and Sale/License  Agreement,  the
parties entered into a stock purchase  agreement pursuant to which Bausch & Lomb
purchased 266,667 shares of Class A Common Stock for $500,000. Bausch & Lomb has
agreed to purchase an  additional  $350,000 of shares of Class A Common Stock on
the  first  anniversary  of the  agreement  so  long  as the  Collaboration  and
Sale/License  Agreement has not been terminated prior to that date.  Pursuant to
the Stock Purchase Agreement,  the shares purchased by Bausch & Lomb are subject
to certain voting and transfer  restrictions  and may be redeemed at cost at the
option of either the Company or the  purchaser.  Subject to certain  exceptions,
Bausch  & Lomb  has  agreed  to vote  its  shares  of  Class A  Common  Stock in
accordance with the recommendations of Symbollon's Board of Directors.  Bausch &
Lomb may  offset  certain  portions  of the  future  milestone  payments  due to
Symbollon pursuant to the Collaboration and Sale/License  Agreement by redeeming
at cost the shares  purchased  pursuant to the Stock Purchase  Agreement.  Under
certain  circumstances,  if the  Collaboration  and  Sale/License  Agreement  is
terminated prior to Symbollon's receipt of the required milestone payments, then
Bausch & Lomb has agreed to transfer to  Symbollon  for no  consideration  up to
$500,000  worth  (valued  at  their  original  purchase  price)  of the  shares.
Additionally,  if the Collaboration and Sale/License  Agreement is terminated by
Bausch & Lomb prior to its fourth  anniversary,  Bausch & Lomb may  require  the
Company to repurchase up to $350,000  worth (valued at their  original  purchase
price) of the shares  annually  through  the  seventh  anniversary  of the Stock
Purchase  Agreement in an amount  equal to 25% of the  Company's  positive  cash
flows from operating activities.

Item 6. Exhibits and Reports on Form 8-K

         (a)      Exhibits

                  See Index to Exhibits on Page E-1.

         (b)      Reports on Form 8-K

                  No reports on Form 8-K were filed during the quarter for which
this report is filed.



<PAGE>



                                   SIGNATURES

         In accordance with the requirements of the Exchange Act, the registrant
caused this report to be signed on its behalf of the undersigned, thereunto duly
authorized.

                                    SYMBOLLON CORPORATION

Date:  August 14, 1997              By: /s/ Paul C. Desjourdy
                                       ----------------------  
                                       Paul C. Desjourdy, Vice President/CFO
                                       and authorized signatory


<PAGE>


                              SYMBOLLON CORPORATION

                                INDEX TO EXHIBITS

                                                                         Page #

10.18  Commercial Lease, dated June 5, 1997, between the Company and
       Pine Street Realty Trust.........................................

10.19  Collaboration and Sale/License Agreement, dated August 4, 1997,
       between the Company and Bausch & Lomb Pharmaceuticals, Inc.*.....

10.20  Stock Purchase Agreement, dated August 4, 1997, between the Company
       and Bausch & Lomb Pharmaceuticals, Inc. .........................

11.1   Statement re: Computation of Earnings per Share..................

27.1   Financial Data Schedule..........................................
- -------------

*  Indicates that material has been omitted and Confidential treatment
has been requested therefor.  All such omitted material has been filed
separately with the Commission pursuant to Rule 24b-2.


                        STANDARD FORM COMMERCIAL LEASE
                                         Member Greater Boston Real Estate Board

1.  PARTIES

Pine Street Realty Trust  ("LESSOR"),  which expression shall include its heirs,
successors,  and  assigns  where the  context so admits,  does  hereby  lease to
Symbollon Corporation

2.  PREMISES

("LESSEE"),   which  expression  shall  include  their  successors,   executors,
administrators,  and assigns where the context so admits,  and the LESSEE hereby
leases the following described  premises:  5,400 rentable SF at 37 Loring Drive,
Framingham,  Massachusetts 01702, together with the right to use in common, with
others  entitled  thereto,  the  hallways,  stairways,  elevators,  and parking,
necessary for access to said leased premises, and lavatories nearest thereto.

3.  TERM

The term of this lease  shall be for Five (5) years  commencing  on July 1, 1997
and ending on August 31, 2002.

4.  RENT

The LESSEE shall pay to the LESSOR rent at the rate of (see  attached  addendum)
dollars per year,  payable in advance in monthly  installments  of (See attached
addendum).

5.  SECURITY DEPOSIT

Upon the execution of this lease,  the LESSEE shall pay to the LESSOR  $2,363.50
dollars,  which  shall be held as a security  for the  LESSEE's  performance  as
herein  provided and refunded to the LESSEE at the end of this lease  subject to
the LESSEE's satisfactory compliance with the conditions hereof.

6.  RENT ADJUSTMENT

Not Applicable


<PAGE>

7.  UTILITIES

The LESSEE shall pay, as they become due, all bills for electricity,  gas, water
and sewer,  and other  utilities  (whether they are used for furnishing  heat or
other  purposes)  that  are  furnished  to the  leased  premises  and  presently
separately  metered,  and all  bills  for  fuel  furnished  to a  separate  tank
servicing the leased premises exclusively.

LESSOR shall have no obligation to provide utilities or equipment other than the
utilities and equipment within the premises as of the commencement  date of this
lease.  In the event LESSEE  requires  additional  utilities or  equipment,  the
installation  and  maintenance  thereof shall be the LESSEE's  sole  obligation,
provided that such  installation  shall be subject to the written consent of the
LESSOR.  LESSEE is responsible for annual  maintenance and repair to the rooftop
HVAC units.  LESSOR shall assign to LESSEE any warranties for the HVAC equipment
located within the leased premises.

8.  USE OF LEASED PREMISES

The  LESSEE  shall  use  the  leased  premises  only  for  the  purpose  of R&D,
Manufacturing  and Office use.  LESSOR  warrants that no matter of record title,
local zoning laws or the rules and  regulations  of the Loring Drive Condo Trust
interfere  with use of the leased  premises  for the  purpose  set forth  above.
LESSOR shall warrant and defend LESSEE in the quiet  enjoyment and possession of
the leased premises.

9.  COMPLIANCE WITH LAWS

The LESSEE  acknowledges  that no trade or occupation  shall be conducted in the
leased premises or use made thereof which will be unlawful,  improper,  noisy or
offensive,  or contrary to any law or any municipal by-law or ordinance in force
in the city or town in which the  premises  are  situated.  The  LESSEE  may use
hazardous chemicals on the leased premises provided that such chemicals are used
and disposed of in accordance with all applicable laws.

10.  FIRE INSURANCE

The  LESSEE  shall not permit  any use of the  leased  premises  which will make
voidable any insurance on the property of which the leased  premises are a part,
or on the  contents  of said  property  or which shall be contrary to any law or
regulation  from time to time  established  by the New  England  Fire  Insurance
Rating  Association,  or any similar body  succeeding to its powers.  The LESSEE
shall on demand reimburse the LESSOR, and all other tenants, all extra insurance
premiums caused by the LESSEE's use of the premises.

11.  MAINTENANCE

THE LESSEE agrees to maintain the leased premises in good  condition,  damage by
fire and other casualty only excepted, and whenever necessary,  to replace plate
glass and other glass therein, acknowledging that the leased premises are now in
good order and the glass whole.

A.  LESSEE'S  OBLIGATION  The LESSEE shall not permit the leased  premises to be
overloaded,  damaged,  stripped,  or defaced, nor suffer any waste. LESSEE shall
obtain written consent of LESSOR before erecting any sign on the premises.

B.  LESSOR'S  OBLIGATION  The LESSOR  agrees to maintain  the  structure  of the
building of which the leased  premises are a part in the same condition as it is
at the  commencement  of the term or as it may be put in during the term of this
lease,  reasonable  wear and  tear,  damage  by fire  and  other  casualty  only
excepted, unless such maintenance is required because of the LESSEE or those for
whose conduct the LESSEE is legally responsible.


<PAGE>

12.  ALTERATIONS-ADDITIONS

The LESSEE  shall not make  structural  alterations  or  additions to the leased
premises,  but may make non-structural  alterations provided the LESSOR consents
thereto in writing, which consent shall not be unreasonably withheld or delayed.
All such  allowed  alterations  shall be at  LESSEE's  expense  and  shall be in
quality at least equal to the present construction.  LESSEE shall not permit any
mechanics' liens, or similar liens, to remain upon the leased premises for labor
and material  furnished to LESSEE or claimed to have been furnished to LESSEE in
connection  with  work of any  character  performed  or  claimed  to  have  been
performed  at the  direction  of  LESSEE  and  shall  cause  any such lien to be
released  of  record  forthwith  without  cost to  LESSOR.  Any  alterations  or
improvements  made by the LESSEE  shall become the property of the LESSOR at the
termination of occupancy as provided herein.

13.  ASSIGNMENT SUBLEASING

The  LESSEE  shall  not  assign or  sublet  the whole or any part of the  leased
premises  without  LESSOR's  prior written  consent  (which consent shall not be
unreasonably withheld). Notwithstanding such consent, LESSEE shall remain liable
to  LESSOR  for the  payment  of all rent and for the  full  performance  of the
covenants  and  conditions  of this lease.  Should  Lessee  assign or sublet the
premises  and receive  rent in excess of that due the Lessor,  then Lessee shall
share such profits equally with the Lessor.

14.  SUBORDINATION

This lease shall be subject and  subordinate to any and all mortgages,  deeds of
trust  and  other  instruments  in the  nature  of a  mortgage,  now or any time
hereafter,  a lien or liens on the  property of which the leased  premises are a
part and the LESSEE shall,  when  requested,  promptly  execute and deliver such
written  instruments  as shall be  necessary to show the  subordination  of this
lease to said mortgages,  deeds of trust or other such instruments in the nature
of a mortgage.


15.  LESSOR'S ACCESS

The LESSOR or agents of the LESSOR may, at reasonable  times,  enter to view the
leased  premises  and may remove  placards and signs not approved and affixed as
herein  provided,  and make repairs and alterations as LESSOR should elect to do
and may show the  leased  premises  to  others,  and at any time  within six (6)
months before the  expiration of the term, may affix to any suitable part of the
leased  premises a notice for letting or selling the leased premises or property
of which the leased  premises  are a part and keep the same so  affixed  without
hindrance or molestation.

16.  INDEMNIFICATION AND LIABILITY

The LESSEE shall save the LESSOR harmless from all loss and damage occasioned by
the use or escape  of water or by the  bursting  of  pipes,  as well as from any
claim or damage  resulting  from neglect in not  removing  snow and ice from the
roof of the  building  or from the  sidewalks  bordering  upon the  premises  so
leased, or by any nuisance made or suffered on the leased premises.  The removal
of snow and ice from the sidewalks bordering on the leased premises shall be the
LESSEE's responsibility unless such loss is caused by neglect of the LESSOR.

17.  LESSEE'S LIABILITY INSURANCE

The LESSEE shall  maintain with respect to the leased  premises and the property
of which the leased premises are a part comprehensive public liability insurance
in the amount of  $1,000,000.00  with  property  damage  insurance  in limits of
$1,000,000.00 in responsible companies qualified to do business in Massachusetts
and in good  standing  therein  insuring  the  LESSOR as well as LESSEE  against
injury to persons or damage to property as provided.  The LESSEE  shall  deposit
with the LESSOR  certificates for such insurance at or prior to the commencement
of the term, and  thereafter  within thirty (30) days prior to the expiration of
any such  policies.  All such  insurance  certificates  shall  provide that such
polices  shall not be  canceled  without  at least ten (10) days  prior  written
notice to each assured named therein.

18.  FIRE, CASUALTY - EMINENT DOMAIN

Should a substantial portion of the leased premises, or of the property of which
they are a part, be substantially damaged by fire or other casualty, or be taken
by eminent domain, the LESSOR may elect to terminate this lease. When such fire,
casualty,  or taking renders the leased  premises  substantially  unsuitable for
their  intended use, a just and  proportionate  abatement of rent shall be made,
and the LESSEE  may elect to  terminate  this lease if: (a) The LESSOR  fails to
give written notice within (30) days of intention to restore leased premises, or
(b) The LESSOR fails to restore the leased premises to a condition substantially
suitable for their  intended use within ninety (90) days of said fire,  casualty
or taking. The LESSOR reserves,  and the LESSEE grants to the LESSOR, all rights
which the LESSEE may have for damages or injury to the leased  premises  for any
taking by eminent domain, except for damage to the LESSEE's fixtures,  property,
or equipment including leasehold improvements.


<PAGE>

19.  DEFAULT AND BANKRUPT

In the event that (a) The LESSEE shall default in the payment of any installment
of rent or other sum herein  specified and such default  shall  continue for ten
(10) days after written notice  thereof;  or (b) The LESSEE shall default in the
observance or performance of any other of the LESSEE's covenants, agreements, or
obligations hereunder and such default shall not be corrected within thirty (30)
days after written notice thereof;  or (c) The LESSEE shall be declared bankrupt
or insolvent  according to law, or, if any assignment  shall be made of LESSEE's
property  for the  benefit of  creditors,  then the LESSOR  shall have the right
thereafter,  while  such  default  continues,  to  re-enter  and  take  complete
possession of the leased premises,  to declare the term of this lease ended, and
remove the LESSEE's  effects,  without  prejudice to any remedies which might be
otherwise used for arrears of rent or other default.  The LESSEE shall indemnify
the  LESSOR  against  all loss of rent and other  payments  which the LESSOR may
incur by reason of such  termination  during  the  residue  of the term.  If the
LESSEE shall default,  after  reasonable  notice  thereof,  in the observance or
performance  of any  conditions  or covenants on LESSEE's part to be observed or
performed  under or by virtue of any of the  provisions  in any  article of this
lease,  the  LESSOR,  without  being under any  obligation  to do so and without
thereby waiving such default, may remedy such default for the account and at the
expense  of the  LESSEE.  If the  LESSOR  makes any  expenditures  or incurs any
obligations for the payment of money in connection therewith,  including but not
limited to, reasonable attorney's fees in instituting,  prosecuting or defending
any action or proceeding,  such sums paid or obligations insured,  with interest
at the rate of 18 per annum and costs, shall be paid to the LESSOR by the LESSEE
as additional rent.

20.  NOTICE

Any notice from the LESSOR to the LESSEE  relating to the leased  premises or to
the  occupancy  thereof,  shall be deemed  duly  served,  if left at the  leased
premises  addressed  to  the  LESSEE,  or if  mailed  to  the  leased  premises,
registered  or  certified  mail,  return  receipt  requested,  postage  prepaid,
addressed  to the LESSEE.  Any notice from the LESSEE to the LESSOR  relating to
the leased premises or to the occupancy thereof, shall be deemed duly served, if
mailed to the LESSOR by registered or certified mail, return receipt  requested,
postage prepaid,  addressed to the LESSOR at such address as the LESSOR may from
time to time advise in writing.  All rent notices  shall be paid and sent to the
LESSOR One Hollis Street, Suite 212 Wellesley, MA 02181 (617) 235-7065.




21.  SURRENDER

The LESSEE shall at the expiration or other termination of this lease remove all
LESSEE's goods and effects from the leased premises,  (including, without hereby
limiting the  generality of the  foregoing,  all signs and lettering  affixed or
painted by the LESSEE,  either  inside or outside the leased  premises).  LESSEE
shall deliver to the LESSOR the leased premises and all keys, locks thereto, and
other fixtures connected  therewith and all alterations and additions made to or
upon the leased  premises,  in good condition,  damage by fire or other casualty
only  excepted.  In the event of the LESSEE's  failure to remove any of LESSEE's
property from the premises,  LESSOR is hereby  authorized,  without liability to
LESSEE for loss or damage thereto, and at the sole risk of LESSEE, to remove and
store any of the property at LESSEE's expense,  or to retain same under LESSOR's
control or to sell at public or private sale,  without  notice any or all of the
property  not so  removed  and to apply  the net  proceeds  of such  sale to the
payment of any sum due hereunder, or to destroy such property.

22.  BROKERAGE

The  Broker(s)  named herein R.W.  Holmes Realty Co.,  Inc.  warrant(s)  that he
(they) is (are) duly licensed as such by the Commonwealth of Massachusetts,  and
join(s)  in  this  agreement  and  become(s)  a  party  hereto,  insofar  as any
provisions  of  this  agreement  expressly  apply  to  him  (them),  and  to any
amendments or  modifications  of such  provisions to which he (they) agree(s) in
writing.

LESSOR agrees to pay the above-named  Broker upon the term commencement date a
fee for  professional  services of R.W. Holmes Realty Co., Inc.

23.  OTHER PROVISIONS

It is also understood and agreed that SEE ATTACHED ADDENDUM

IN WITNESSWHEREOF,  the said parties hereunto set their hands and seals this 5th
day of June, 1997.

SYMBOLLON CORPORATION



/s/ Paul C. Desjourdy                                /s/ William Foley
- ---------------------                                -----------------  
LESSEE                                               LESSOR
Paul C. Desjourdy, Executive V.P.                    William Foley, as Trustee
                                                     and not Individually


<PAGE>


                   ADDENDUM TO STANDARD FORM COMMERCIAL LEASE
                                     Between
                                WILLIAM FOLEY and
                              SYMBOLLON CORPORATION

1)       Rent:
         During the term of the lease, Lessee shall pay rent as follows:

                  Original Period           Rental Rate (triple net)
         July 1, 1997 to Aug. 31, 1998          $5.25/SF  (The payments for year
         Sept. 1, 1998 to Aug. 31, 1999         $5.50/SF   1 will be spread out 
         Sept. 1, 1999 to Aug. 31, 2000         $5.75/SF   over 14 months)
         Sept. 1, 2000 to Aug. 31, 2001         $6.00/SF
         Sept. 1, 2001 to Aug. 31, 2002         $6.25/SF

         All base  rental  payments  shall be due and  payable in advance on the
         first day of each month of the Lease term except for the first  month's
         rent  and  security  deposit  which  is  due  and  payable  upon  lease
         execution.

2) NNN Expenses:
         The Lessee  shall pay as  additional  rent during the term of the Lease
         its proportionate  share of Real Estate Taxes, all exterior common area
         maintenance  and repairs,  which  includes  landscape and snow removal,
         basic building insurance, and common area utilities. The annual cost of
         these NNN expenses shall be due and payable  monthly,  at the beginning
         of each month except for the first month which shall be due and payable
         upon  Lease   execution.   Lessee   will  be   responsible   for  their
         proportionate  share of all  increases  in operating  expenses.  Lessee
         shall pay estimated monthly NNN expenses of $675.00 at the beginning of
         each month.  Lessor will  prepare a  reconciliation  at the end of each
         twelve month period of actual  expenses and issue either an  additional
         invoice or credit.

3)       Option to Renew:
         Lessee shall have the option to renew this Lease for one (1) additional
         period of Five (5) years,  provided that Lessee has not been in default
         under any of the terms and  conditions  of the Lease,  by giving Lessor
         six (6) months prior written  notice.  The terms and  conditions of the
         Lease  shall be the same  except for the rental  rate which shall be as
         follows:

                  Original Period           Rental Rate (triple net)
                  ---------------           ------------------------
         Sept. 1, 2002 to Aug. 31, 2003              $6.50/SF
         Sept. 1, 2003 to Aug. 31, 2004              $6.75/SF
         Sept. 1, 2004 to Aug. 31, 2005              $7.00/SF
         Sept. 1, 2005 to Aug. 31, 2006              $7.25/SF
         Sept. 1, 2006 to Aug. 31, 2007              $7.50/SF


<PAGE>

4)       Condition of Space: (See Exhibit "A")
         Lessor  agrees  to make  prior to the  commencement  of the  Lease  the
         improvements  to the leased premises as detailed on Exhibit "A" hereto.
         Lessee agrees to pay Lessor Fifty  Thousand  Dollars  ($50,000) for the
         improvements  upon  the  later  of  commencement  of the  lease  or the
         completion of the  improvements.  If the improvements are not completed
         by July 1, 1997, then the Lease Term shall be deemed to commence on the
         date  of  completion  of  the   improvements,   provided  that  if  the
         improvements are not completed by August 1, 1997,  Lessee may terminate
         the Lease and receive a full refund of all  amounts  paid or  deposited
         with Lessor hereunder.  Any build-out change orders will be at the sole
         expense of the Lessee.  Lessor agrees to notify Lessee of the timetable
         for the work to make such  improvements,  and Lessee shall have a right
         to be  present  during  such  work.  Lessee  and  Lessor  agree to work
         together so that the improvements as specified are timely completed.





                    COLLABORATION AND SALE/LICENSE AGREEMENT

                                 By and Between

                       BAUSCH & LOMB PHARMACEUTICALS, INC.

                                       and

                              SYMBOLLON CORPORATION



                        ---------------------------------

                           Dated as of August 4, 1997
                       ----------------------------------












<PAGE>



                               TABLE OF CONTENTS1

                                                                        Page No


Article 1          Definitions........................................      1

Article 2          Joint Development Committee........................      6

         2.1       Formation..........................................      6
         2.2       Responsibilities...................................      6
         2.3       Disagreements......................................      7
         2.4       Market Opportunity Prior to First Commercial Sale..      7
         2.5       Market Opportunity After First Commercial Sale.....      7

Article 3          Research and Development Efforts...................      8

         3.1       Efforts............................................      8
         3.2       Funding............................................      8
         3.3       Sharing of Information.............................      9
         3.4       Material Samples...................................      9

Article 4          B&L License........................................      9

         4.1       Basic Grant........................................      9
         4.2       Specific Limitations...............................      9
         4.3       Symbollon Retained Rights..........................     10
         4.4       Otic Infections....................................     10
         4.5       Rest of World......................................     10
         4.6       Recording..........................................     10

Article 5          Clinical Trials and Regulatory Filings.............     11

Article 6          Sale of Patent.....................................     11

         6.1       Transfer of Patent Rights..........................     11
         6.2       Installment Sale Payments..........................     12
         6.3       Orphan Drug Products...............................     12
         6.4       Cosmetic Eye Scrub Product.........................     13
         6.5       Negative Covenants.................................     13
- -----------------
1 This Table of Contents is for convenience of reference only and is not part
of this Agreement.

<PAGE>


                                                                        Page No.


Article 7          Royalties..........................................     13

         7.1       Royalties..........................................     13
         7.2       Sublicense Fees....................................     13
         7.3       Overall Value......................................     14

Article 8          Symbollon Sale of Products Outside Territory.......     14

Article 9          Payments...........................................     14

         9.1       Timing of Royalty Payments.........................     14
         9.2       Records of Net Sales...............................     15
         9.3       Payments...........................................     15

Article 10         B&L's Exclusivity Obligations......................     15

Article 11         Confidentiality and Publications...................     16

         11.1      Proprietary Information............................     16
         11.2      Joint Disclosures..................................     16

Article 12         Ownership of Intellectual Property.................     17

         12.1      General Intent.....................................     17
         12.2      New Inventions.....................................     17
         12.3      Symbollon's Rights in B&L's Joint Inventions.......     17
         12.4      License Upon Termination...........................     18
         12.5      Patent Applications................................     18
         12.6      Disputes...........................................     18

Article 13         Warranties/Indemnification/Insurance...............     18

         13.1      Representations and Warranties.....................     18
         13.2      Disclaimer.........................................     19
         13.3      Additional Covenants...............................     19
         13.4      Indemnification....................................     19
         13.5      Insurance..........................................     19
         13.6      Additional Indemnification Obligations.............     20
<PAGE>

                                                                        Page No.

Article 14         Infringement and Trademarks........................     20

         14.1      Notice of Infringement.............................     20
         14.2      Control, Cost and Cooperation in Infringement Actions   21
         14.3      Recoveries Against Infringer.......................     21
         14.4      Trademarks.........................................     21

Article 15         Assignability......................................     21

Article 16         Term and Termination...............................     22

         16.1      Term...............................................     22
         16.2      Termination Events ................................     22
         16.3      Termination by B&L.................................     23
         16.4      Effects of Termination.............................     23
         16.5      Survival...........................................     24

Article 17         Supply and Manufacture.............................     24

Article 18         Miscellaneous......................................     24

         18.1      Notices............................................     24
         18.2      Governing Law; Jurisdiction and Venue..............     26
         18.3      Limited Arbitration................................     26
         18.4      Waiver.............................................     26
         18.5      Enforceability.....................................     26
         18.6      Entire Agreement and Amendment.....................     27
         18.7      Independent Contractor.............................     27
         18.8      Headings...........................................     27
         18.9      Further Instruments................................     27
         18.10     Force Majeure......................................     27
         18.11     Counterparts.......................................     28
         18.12     Exhibits and Schedules.............................     28

Exhibits and Schedules
 A -- Patent Applications and Patents
 B -- Project Plan
 C -- Initial Members of the JDC
 D -- Form of Patent Assignment
1.16 -- Exceptions to the Licensed Patents


<PAGE>


                    COLLABORATION AND SALE/LICENSE AGREEMENT


         This Agreement is made as of this 4th day of August, 1997 by and 
between Bausch & Lomb Pharmaceuticals, Inc. ("B&L") and Symbollon Corporation
("Symbollon").

         Symbollon is the owner of certain  proprietary  technology  relating to
topical  iodine.  B&L has resources and expertise  useful in the development and
marketing  of ocular  pharmaceuticals.  The  parties  wish to  collaborate  in a
designated  field on research and  development  of novel  pharmaceutical  agents
which incorporate  Symbollon's  proprietary  topical iodine technology,  and B&L
wishes  to  purchase  a  patent  and  obtain  a  license  from  Symbollon  under
Symbollon's proprietary technology for the manufacture, use and sale of products
in such  designated  field,  all on the terms and  conditions  set forth in this
Agreement. Accordingly, the parties hereby agree as follows:


                             Article 1 - Definitions

         For purposes of this Agreement,  the following  capitalized terms shall
have the following definitions:

         1.01     "Affiliate"  means any individual,  corporation,  partnership,
                  proprietorship or other entity controlled by, controlling,  or
                  under common  control with a party through  equity  ownership,
                  ability to elect directors or direct  management and policies,
                  or by virtue of a majority of overlapping directors, and shall
                  include   (a)  any   individual,   corporation,   partnership,
                  proprietorship or other entity directly or indirectly  owning,
                  owned by or under  common  ownership  with  such  party to the
                  extent of fifty  percent (50%) or more of the equity or voting
                  shares,  including shares owned beneficially by such party and
                  (b) each officer, director or partner of such party.

         1.02 "AADA" means an Abbreviated Antibiotic Drug Application filed with
the FDA.

         1.03 "ANDA" means an Abbreviated  New Drug  Application  filed with the
FDA.

         1.04     "Collaborative    Project"   means   the    development    and
                  commercialization  of the Products  pursuant to this Agreement
                  supervised and overseen by the JDC.

         1.05     "Drug Master File" means those files  maintained  from time to
                  time by Symbollon with the FDA regarding its technology.

         1.06     "Effective Date" means the date first written above.


<PAGE>

         1.07     "Field"   means  the  topical   treatment   of  human   ocular
                  infections,  inclusive  of an eye scrub  product  which may be
                  used in the periocular region to resolve conditions related to
                  or arising from an ocular  infection;  provided that, prior to
                  the  first  commercial  sale of a  Product,  the  Field may be
                  permanently  reduced  in scope  from time to time by the Joint
                  Development  Committee  pursuant to Section 2.4, and after the
                  first  commercial sale of a Product,  the Field may be further
                  permanently  reduced  in scope from time to time  pursuant  to
                  Section 2.5.

         1.08 "FDA" means U.S.  Food and Drug  Administration  or any  successor
entity thereto.

         1.09     "FDA  Compliance  Costs"  means the  reasonable  out-of-pocket
                  costs relating to the  manufacturing  facility incurred by B&L
                  in  connection  with or as a result of FDA product  approvals,
                  inspections  or  compliance  with  FDA  regulations,   orders,
                  directives or suggestions.

         1.10     "Generic"  means any product in the Field  approved by the FDA
                  pursuant to an ANDA,  AADA or an NDA (including a supplemental
                  or  amended  NDA)  which  is  a   pharmaceutical   equivalent,
                  pharmaceutical  alternative or therapeutic equivalent (each as
                  defined by the FDA) to a Product.

         1.11     "Gross  Profit"  means Net Sales less cost of goods  sold,  as
                  determined under generally accepted accounting principles.

         1.12 "IND" means an Investigational New Drug Application filed with the
FDA.

         1.13     "Inventions"  means  all  discoveries,  inventions,  concepts,
                  ideas or intangible property, whether patentable or not, made,
                  conceived,  or reduced to practice in the course of or related
                  to Product  research  and  development  performed  pursuant to
                  Article 3.

         1.14     "Joint  Development  Committee"  or "JDC" means a committee of
                  officers,  employees or  consultants  of Symbollon  and B&L as
                  described in Article 2 of this Agreement.

         1.15     "Joint Invention" has the meaning set forth in subsection 
12.2(b).

         1.16     "Licensed  Patents"  means  all of  Symbollon's  rights in and
                  under patents and patent applications  applicable to the Field
                  and one or more valid  claims of which  covers any  Product or
                  method of using or manufacturing any Product, as follows:  (a)
                  the  patents and patent  applications  listed in Exhibit A, as
                  well as all patents issuing therefrom in which Symbollon has a

<PAGE>

                  property  interest or under which Symbollon  acquires  license
                  rights (except as disclosed on Schedule 1.16 attached  hereto,
                  Symbollon   has  the  right  and   authority   to  license  or
                  sublicense,  as the case may be, such  property  interests  or
                  license rights), (b) any patent or patent application covering
                  an Invention or Joint Invention assigned to Symbollon pursuant
                  to Section 12.2, (c) any other future  iodine-based  patent or
                  patent  application in which  Symbollon  acquires any property
                  interest or license rights (but only to the extent such rights
                  may by  their  terms be  further  assigned  to B&L  hereunder;
                  provided  that   Symbollon   agrees  to  exercise   Reasonable
                  Commercial  Efforts  to  obtain  the right to  sublicense  any
                  license  rights that may be acquired in the  future),  and (d)
                  any divisions,  continuations  or continuations in part of the
                  patents  or  patent  applications  set  forth  above or of the
                  Patent   Rights,   including   any  reissue,   re-examination,
                  re-registration or extension.  Symbollon shall promptly notify
                  B&L from time to time as new patent  applications are filed or
                  patents  are  issued  which  fall  within  the  definition  of
                  Licensed Patents. Exhibit A shall be updated from time to time
                  to reflect any Licensed Patents which arise following the date
                  hereof,  and to delete any  patent  rights,  whether  owned or
                  licensed,  which  do not  include  one or  more  valid  claims
                  covering any Product or method of using any Product.


         1.17     "Manufacturing  Costs"  shall  mean  B&L's  standard  cost  of
                  manufacturing  the Product,  which shall include direct labor,
                  direct and  variable  materials  (including  scrap),  freight,
                  variable overhead, an allocation of fixed overhead,  and yield
                  losses, plus or minus reasonable  manufacturing variances; all
                  determined in accordance  with generally  accepted  accounting
                  principles   applied   consistently  and  in  accordance  with
                  existing and demonstrable B&L practices; but provided that, in
                  determining such allocation, B&L shall use the lowest and most
                  favorable method of allocation used by B&L for any proprietary
                  product manufactured by B&L at its manufacturing  facility (in
                  volumes similar to the quantity of Product manufactured by B&L
                  for Symbollon)  exclusively for sale to, and  distribution by,
                  an unrelated third party.

         1.18 "NDA" means a New Drug Application filed with the FDA.

         1.19     "Net  Sales"  means the sum of all  amounts  received  and all
                  other  consideration  received (when in a form other than cash
                  or  its  equivalent,   the  fair  market  value  thereof  when
                  received)  by a party (and in the case of B&L,  a third  party
                  sublicensee  pursuant  to  Section  4.2(b))  or any  of  their
                  Affiliates  from persons or entities who are not Affiliates or
                  (in the case of B&L,  sublicensees pursuant to Section 4.2(b))
                  by reason of the sale,  distribution  or use of Product  less,
                  without  duplication:  (a)  discounts  and  rebates,  if  any,
                  actually given in the ordinary course of business, (b) credits
                  or  allowances,  if any,  actually given or made on account of

<PAGE>

                  price adjustments, returns, rejections, recalls or destruction
                  of  such  Products,  (c) any  insurance  and  prepaid  freight
                  expenses  actually incurred in connection with the shipment of
                  such  Products if  included  in the billed  amount and (d) any
                  sales, value-added or excise tax. "Net Sales" shall not be net
                  of any amounts paid or deductions  made for (y) commissions or
                  fees  paid to any  person,  whether  they be with  independent
                  sales  agencies,   regularly   employed  by  a  party  or  its
                  Affiliates,   or   under   a   co-promotion   arrangement   as
                  contemplated  under  subsection  4.2(b)  or (z)  discounts  or
                  rebates,  if any,  actually  allowed,  if any such discount or
                  rebate has been  granted on any basis other than the  purchase
                  of Products.  Any overpayment of royalties due to an allowable
                  deduction for discounts under clause (a), above, applicable to
                  periods  for which  royalties  have  already  been paid may be
                  credited against future royalty obligations.

         1.20     "Non-Orphan  Drug  Products"  mean  Product(s)  developed  and
                  commercialized pursuant to this Agreement which do not qualify
                  for "orphan drug" status (as defined by the FDA).

         1.21     "Orphan  Drug   Products"   mean   Product(s)   developed  and
                  commercialized  pursuant to this  Agreement  which qualify for
                  "orphan drug" status (as defined by the FDA).

         1.22     "Other  Costs"  shall  mean  in  each  case  set  forth  in  a
                  reasonably  detailed  statement  delivered to Symbollon by B&L
                  with each invoice for Product manufactured and supplied by B&L
                  to Symbollon: (i) a reasonable and customary allocation of FDA
                  Compliance Costs pertaining to the Product;  (ii) a reasonable
                  and  customary  allocation as between B&L and Symbollon of any
                  fees or royalties  incurred by B&L to a unrelated  third party
                  related  to the  manufacture  of the  Product;  and  (iii)  an
                  allocation  of B&L's direct cost of research  and  development
                  and  other   technical   services   relating  to  the  Product
                  reasonably,  necessarily and actually rendered,  following FDA
                  approval of the NDA for the Product.


         1.23     "Patent  Rights" mean a United States patent number  5,639,481
                  issued June 17,  1997  entitled,  "Method for the  Therapeutic
                  Treatment  of a  Mammalian  Eye Using an  Admixed  Composition
                  Containing Free Molecular Iodine", identifying Jack H. Kessler
                  and James C.  Richards as the  inventors,  but  excluding  all
                  continuations,     continuation-in-parts,     divisions    and
                  extensions, and excluding all foreign counterparts thereof.

         1.24     "Product" means any product in the Field which is based on the
                  Patent Rights,  the Licensed Patents,  a Joint Invention owned
                  by B&L or Proprietary Information of Symbollon.


<PAGE>

         1.25     "Project  Plan"  means  the  written  plan  (initially  to  be
                  developed by the parties within sixty (60) days of the date of
                  this  Agreement and attached  hereto as Exhibit B, as the same
                  may be  revised  in  writing  from  time to time  pursuant  to
                  Section  2.2.) for the  research and  development  of Products
                  which sets forth (a) the research and  development  work to be
                  performed  by the  respective  parties,  (b) the  schedule  of
                  agreed upon milestones and completion of such work, and (c) an
                  annualized budget.

         1.26     "Proprietary  Information"  means all  technical  information,
                  data,  techniques,  knowledge,  skill,  know-how,  experience,
                  trade secrets,  developments,  formulae, processes,  materials
                  and  other  information  of a  party  which  is  disclosed  or
                  transferred  from one party to the other or  developed  in the
                  course  of  performance  under,  or during  the term of,  this
                  Agreement,   including   by  way  of   illustration   and  not
                  limitation,  designs,  drawings,  documents,  models and other
                  similar  information  and shall include  Inventions  and Joint
                  Inventions. "Proprietary Information" shall not include any of
                  the foregoing  that are (i) in the possession of the receiving
                  party at the  time of  disclosure  as  shown by the  receiving
                  party's  files and  records  immediately  prior to the time of
                  disclosures;  (ii)  prior to or after  the time of  disclosure
                  becomes part of the public  knowledge or literature,  not as a
                  result of any improper  inaction or action of a party under an
                  obligation of  confidentiality;  or (iii) lawfully obtained by
                  the receiving party from sources independent of the disclosing
                  party,  which  sources  have a lawful  right to disclose  such
                  information. Nothing herein shall in any way affect the rights
                  of  an  Affiliate  to  claim  a  trade  secret   independently
                  developed by such  Affiliate  without in any way relying on or
                  having  knowledge  of  any  relevant  Proprietary  Information
                  covered by this Agreement.

         1.27     "Reasonable Commercial Efforts" means efforts no less diligent
                  than  either  party   customarily   exercises   under  similar
                  circumstances   of  its  own  consistent  with  good  business
                  judgment,  or if no prior similar circumstances have occurred,
                  then such efforts should be  commercially  reasonable in light
                  of existing  circumstances  and consistent  with good business
                  judgment.

         1.28     "Regulatory Approvals" has the meaning set forth in Article 5.

         1.29     "Regulatory Filings" has the meaning set forth in Article 5.

         1.30     "Right of First Negotiation" shall mean B&L's exclusive option
                  to negotiation for rights as specified herein. Such option may
                  be exercised by B&L by providing  written  notice to Symbollon
                  prior to expiration of such option.  If such written notice is

<PAGE>

                  timely  provided,  then the parties agree to negotiate in good
                  faith for a period of three months a definitive  agreement for
                  the rights covered by such option. If the parties are not able
                  to execute a  definitive  agreement  for the  relevant  rights
                  within such  three-month  period,  then for a period of twelve
                  (12) months following such three-month period Symbollon agrees
                  not to execute an agreement  covering the relevant rights with
                  a third  party on terms  more or as  favorable  as those  last
                  offered thereunder without B&L's prior written consent.

         1.31     "Territory"   means   the   United   States,   including   its
                  territories, possessions and military bases outside the United
                  States.  Further, on a Product by Product basis, the Territory
                  shall  include  Canada,  if  within  one (1) year of the first
                  commercial  sales of any  Product,  B&L  initiates  commercial
                  sales of the Product in Canada.

                   1.32 "Warehousing  Costs" shall mean B&L's direct warehousing
                   costs of Product  purchased  by Symbollon  and raw  materials
                   held  by  B&L  to  produce  such  Product,  including  labor,
                   freight,  inventory  write-offs  due to such  Product  or raw
                   materials  expiration and costs  associated  with  destroying
                   expired  Product or raw materials,  plus normal and customary
                   allocable  warehousing  overhead  costs;  all  determined  in
                   accordance  with  generally  accepted  accounting  principles
                   applied  consistently  and in  accordance  with  existing and
                   demonstrable B&L practices; but provided that, in determining
                   such allocation,  B&L shall use the lowest and most favorable
                   method of allocation used by B&L for any proprietary  product
                   stored by B&L at its manufacturing  facility for sale to, and
                   distribution by, an unrelated third party.



                     Article 2 - Joint Development Committee

         2.1  Formation.  The Joint  Development  Committee will be comprised of
five (5) members with three (3) being  appointed and replaced by B&L and two (2)
being  appointed and replaced by Symbollon.  The initial  members of the JDC are
set forth on Exhibit C. Any  changes to the size of the JDC must be  unanimously
agreed  upon by that  committee.  Meetings  of the JDC may be held so long as at
least one (1)  representative  of each  party is  present.  The JDC will meet at
least once per fiscal  quarter.  Such meetings will be telephonic  meetings,  or
will alternate at B&L's or Symbollon's  headquarters,  or as otherwise agreed by
the  parties.  A chair  of the  JDC  will be  appointed  alternately  by B&L and
Symbollon to six-month terms.

         2.2  Responsibilities.  Each party will report to the JDC  regularly on
its progress with respect to its respective work  assignments  under the Project
Plan. The JDC shall supervise and oversee the development and  commercialization
of the Products (the "Collaborative Project"). Without limitation, the JDC shall

<PAGE>

be responsible for (i) approving the product definitions;  (ii) coordinating the
research and development  activities with respect to the Collaborative  Project;
(iii)  approving   modifications  and  updates  to  the  Project  Plan  for  the
implementation of the  Collaborative  Project;  (iv) monitoring  performance and
expenditures  under the  Collaborative  Project in relation to the Project Plan;
(v)  appointing  the party or parties to conduct the  clinical  development  and
testing of the Products and the filing of any IND therefor in the Territory; and
(vi) the determination of which party or parties shall perform any task required
under the Collaborative Project not otherwise assigned hereunder.

         2.3  Disagreements.  If the  members  of the JDC are  unable  to  reach
unanimous  agreement on a matter,  the top executive  officer of each party will
confer as soon as reasonably practicable to thoroughly consider such matter, and
each use his Reasonable  Commercial  Efforts to effect  resolution.  Should such
conference not resolve the  disagreement,  subject to the provisions of Sections
2.5 and any other contract provisions to the contrary,  B&L will, in good faith,
make the  final  decision  to  accept or to  reject  such  proposed  resolution,
provided that, in no event shall the Project Plan be revised  without the mutual
agreement of B&L and  Symbollon  with respect to (a) any matter which  conflicts
with a provision  specifically  set forth in this Agreement and (b) the research
and development work to be performed by Symbollon.

         2.4 Market  Opportunity  Prior to First  Commercial  Sale. Prior to the
first commercial sale of a Product,  if Symbollon  reasonably  believes that the
Collaborative  Project is not addressing the full market  opportunity within the
Field,  then  Symbollon  may request the JDC to address its  concerns  regarding
Product development and/or commercialization. Should the JDC decide that certain
Product  opportunities in the Field are not being pursued,  then the Field shall
thereafter  be reduced in scope to exclude such Product  opportunities.  Section
2.3 shall govern if the JDC can not reach unanimous agreement on this matter. As
part of the  determination  of whether  the full market  opportunity  within the
Field is being addressed,  consideration  should be given to present development
efforts,  planned future development  efforts,  any other iodine-based  products
under  development  or  commercialization  by B&L  pursuant to Article 10, and a
commercially  reasonable  level of resource  commitment by B&L to development of
Products pursuant to this Agreement.

         2.5 Market  Opportunity  After First  Commercial  Sale. After the first
commercial  sale  of a  Product,  if  Symbollon  reasonably  believes  that  the
Collaborative  Project is not addressing the full market  opportunity within the
Field,  then  Symbollon  may request the JDC to address its  concerns  regarding
Product development and/or commercialization. Should the JDC decide that certain
Product  opportunities in the Field are not being pursued,  then the Field shall
thereafter  be reduced in scope to exclude  such Product  opportunities.  If the
members of the JDC are unable to reach unanimous  agreement on a matter, the top
executive officer of each party will confer as soon as reasonably practicable to
thoroughly  consider  such  matter,  and  each use his  commercially  reasonable
efforts  to  effect   resolution.   Should  such   conference  not  resolve  the
disagreement,  then the  parties  agree to submit  this  matter  to  arbitration
pursuant to Section 18.3. The arbitration  process shall take into consideration
any valid business or economic considerations the parties may present in defense

<PAGE>

of their  position,  including  possible  encroachment  by any such new  Product
opportunity of an existing or planned  Product  developed,  or being  developed,
pursuant to this  Agreement.  As part of the  determination  of whether the full
market opportunity within the Field is being addressed,  consideration should be
given to present development  efforts,  planned future development  efforts, any
other  iodine-based  products  under  development  or  commercialization  by B&L
pursuant  to  Article  10,  and a  commercially  reasonable  level  of  resource
commitment by B&L to development of Products pursuant to this Agreement.


                  Article 3 - Research and Development Efforts

         3.1  Efforts.  Each party will  perform  its  respective  research  and
development  efforts  as  initially  set forth in the  Project  Plan.  It is the
parties' intent that (a) B&L will be primarily  responsible for taking all steps
necessary  to  commercialize  Products  in  the  Territory,  including,  without
limitation, formulating Products, conducting animal studies and clinical trials,
making  all  Regulatory  Filings,   identifying   manufacturing  processes,  and
otherwise commercializing Products, and (b) Symbollon will actively consult with
B&L and be available to assist in Product formulations,  as reasonably requested
by B&L.

         3.2  Funding.  B&L  will (a) bear  all of its own  costs  and  expenses
incurred in  connection  with its  performance  under the  Project  Plan and (b)
should B&L request any  assistance  from  Symbollon,  pay Symbollon for its work
under the  Project  Plan at the rates of [*  INDICATES  THAT  MATERIAL  HAS BEEN
OMITTED AND CONFIDENTIAL TREATMENT HAS BEEN REQUESTED THEREFOR. ALL SUCH OMITTED
MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE 24b-2.],
plus  reimbursement for all materials and third party costs reasonably  incurred
by Symbollon in accordance  with the following:  (i) on the Effective Date (with
respect to the first partial fiscal  quarter during the term of this  Agreement)
and,  thereafter,  on or before the first day of each fiscal quarter,  B&L shall
deliver to  Symbollon  a purchase  order  setting  forth  B&L's and  Symbollon's
mutually  agreed  estimate of the work hours and  materials  required  under the
Project Plan for  completion  of  Symbollon's  assigned  work for such  quarter,
together  with the payment to Symbollon  therefor,  (ii) as each fiscal  quarter
progresses,  Symbollon  shall issue an invoice to B&L, if its hours and/or costs
exceed the purchase order amounts previously paid to it at the beginning of such
fiscal  quarter,  and B&L shall pay  Symbollon  the amount of such excess within
thirty (30) days of receipt from Symbollon of an invoice therefor,  and (iii) on
or before the end of each  fiscal  quarter,  Symbollon  shall  notify B&L of any
excess  payment for such quarter,  and any excess shall be credited  against the
amounts due under the next fiscal  quarter's  purchase  order.  Symbollon  shall
provide B&L with monthly summaries of its time and expenses  incurred  hereunder
and an  estimated  projection  of its time  and  expenses  for the  next  month.
Notwithstanding  the above,  Symbollon shall not charge B&L for (i) any time and
expenses  associated with  Symbollon's  participation  in the JDC, (ii) any time
incurred by Dr. Jack H. Kessler and (iii) any time  associated  with the initial
technical  meetings  between  the  parties'  staffs  after the  signing  of this
Agreement. Any dispute relating to Symbollon's invoices which can not be decided

<PAGE>

by good faith negotiations between the parties, shall be resolved by arbitration
pursuant to Section 18.3.

         3.3 Sharing of  Information.  B&L and  Symbollon  will take  reasonable
efforts to make  available and disclose to each other all  information  known by
B&L and Symbollon  concerning the Field as of the Effective Date and at any time
during the term of this Agreement which relates to Product  development.  Except
as otherwise  provided herein,  the parties agree that neither party shall share
any of the other party's Proprietary  Information with any third party or any of
its Affiliates,  except certain  employees serving staff service functions (i.e.
chief medical officer,  legal,  etc.), and consultants and advisors,  subject to
confidentiality  obligations. All Inventions made by B&L pertaining to iodine or
by Symbollon pertaining to the Field will be promptly disclosed to the other, it
being  understood  that the  obligation  to disclose will have no bearing on the
issue of ownership of such  discoveries or inventions.  Prior to each meeting of
the JDC,  each  party  will  deliver  to the  other a verbal or  written  report
presenting  a  meaningful  summary of research  done by that party to date under
this Agreement.  Each party will make regular  presentations to the other of its
research  through the JDC to inform the other party of research  done under this
Agreement. Each party will provide the other with raw data in original form or a
photocopy  thereof for any and all work carried out in the course of the Product
research, development and commercialization as reasonably requested by the other
party.

         3.4  Material  Samples.  All  materials  believed by either party to be
useful in the design of Products and prepared by such party in the course of any
of its research  under this Agreement will be discussed with the other party and
samples of such materials will be submitted to the other party upon request.


                             Article 4 - B&L License

         4.1 Basic Grant. Subject to the terms and conditions of this Agreement,
Symbollon grants to B&L a sole and exclusive  license under the Licensed Patents
and Symbollon's Proprietary Information relating to iodine to make, have made on
behalf of B&L, use, offer to sell, sell and import Products in the Territory for
use in the Field, with the right to grant sublicenses limited to co-promotion or
co-marketing arrangements pursuant to Section 4.2(b).

         4.2      Specific Limitations.

                  (a) Off-Label Use. B&L shall, without limitation,  (i) promote
         any Product  only to  wholesale  and retail  distribution  channels and
         physicians  or other  medical  practitioners  for use  within the Field
         (expressly   including   physicians   who  treat   outpatients   within
         hospital-based  clinics,  departments,  residency  programs,  physician
         offices,  and  managed  care  systems),  (ii) not  promote  any Product
         through   distribution   channels  servicing  only  the  market(s)  for

<PAGE>

         applications outside the Field, and (iii) not promote,  either directly
         or indirectly,  the use of any Product for any applications outside the
         Field.

                  (b)   Co-Promotion.   B&L  will  discuss  with  Symbollon  any
         opportunity to enter into an arrangement,  be it in the form of a joint
         venture,  sublicense or otherwise, with a third party pursuant to which
         B&L and such third party would  co-promote or co-market any Product(s).
         After such discussion and giving due  consideration  to any concerns of
         Symbollon, B&L may enter a co-promotional or co-marketing  arrangement,
         provided that, any such co-promotional or co-marketing agreement, be it
         in the form of a joint venture,  sublicense or otherwise, shall include
         provisions  requiring (a) compliance by the third party with all of the
         terms and  conditions set forth in this  Agreement,  (b) that a copy of
         the true and complete agreement and all amendments thereto be delivered
         to Symbollon  upon  execution  thereof,  and (c) that  Symbollon  shall
         receive one-half of (i) any and all amounts received and (ii) all other
         consideration  received  (when  in  a  form  other  than  cash  or  its
         equivalent,  the fair market value thereof when received) by B&L or its
         Affiliates  directly or  indirectly in or from such third party to such
         co-promotional or co-marketing  agreement, be it in the form of a joint
         venture,  sublicense or otherwise;  provided,  that amounts received as
         Net Sales, or advances thereon,  shall be excluded.  As contemplated in
         the definition of "Net Sales",  it is the parties'  intent that any and
         all consideration paid to or incurred by any joint venture, third party
         sublicensee  or  other  form of  entity  which  is  selling  Product(s)
         hereunder  shall  be at the  sole  cost  and  expense  of  B&L or  such
         co-promoter or co-marketer, as the case may be, and shall not result in
         any reduction of the royalty due to Symbollon under this Agreement.  To
         the extent any  payment is made by B&L to  Symbollon  pursuant  to this
         Section  4.2(b)  which  relates to an  advance  of a  royalty,  then no
         payment shall be made by B&L to Symbollon on the  corresponding  future
         credit against royalties of such advance.

         4.3  Symbollon  Retained  Rights.  Subject  to  Sections  4.4 and  4.5,
Symbollon  shall be free to pursue the research,  development,  manufacture  and
distribution of any product which  incorporates  Symbollon's  proprietary iodine
technology,  independently  or in  cooperation  with a third  party,  in any way
whatsoever outside of the exclusive license granted to B&L.

         4.4 Otic  Infections.  B&L shall have a Right of First  Negotiation  to
include within the Field the topical  treatment of human otic  infections in the
Territory for a period of twenty-four (24) months after the Effective Date.

         4.5 Rest of World.  B&L  shall  have a Right of First  Negotiation  for
rights in the Field outside the Territory for a period of thirty-six (36) months
after the Effective Date.

         4.6  Recording.  B&L shall  have the  right to index a summary  of this
Agreement  acceptable  to both  parties  in the  assignment  records of the U.S.
Patent and Trademark office.



<PAGE>

               Article 5 - Clinical Trials and Regulatory Filings

         B&L shall,  at its sole cost and expense,  conduct all clinical  trials
for Products in the Territory.  Symbollon will cooperate with B&L in the conduct
of any such clinical trials. B&L shall, at its sole cost and expense, secure any
and all licenses,  permits,  approvals and other authorizations (the "Regulatory
Approvals")  needed to  commercialize  Products  in the  Territory.  Subject  to
termination  of this  Agreement by Symbollon  pursuant to Section 16.2 or by B&L
pursuant to Section 16.3, all  submissions  and regulatory  filings,  including,
without  limitation,  all documents,  data and other information  forming a part
thereof (the "Regulatory Filings"), made by or on behalf of B&L in order to gain
the Regulatory  Approvals,  and the Regulatory  Approvals  themselves,  shall be
owned and  maintained by B&L at its sole cost and expense.  Upon  termination of
this  Agreement  by  Symbollon  pursuant to Section  16.2 or by B&L  pursuant to
Section 16.3, all Regulatory Filings and Regulatory Approvals,  subject to B&L's
right  to  maintain  the  confidentiality  of its  manufacturing  know-how  that
constitutes  Proprietary  Information,  shall be  transferred to Symbollon to be
maintained  thereafter  at  Symbollon's  sole cost and  expense.  B&L  grants to
Symbollon, and/or its sublicensee(s), at no cost (except as stated in Article 8)
the right of full access to, use of, reliance on and reference to the Regulatory
Approvals  and the  Regulatory  Filings.  B&L shall take all  legally  available
measures, including, without limitation, providing waivers of confidentiality to
Symbollon,  and/or  its  sublicensee(s),  at the time of filing  any  Regulatory
Filings  and  thereafter  to secure for  Symbollon,  and/or its  sublicensee(s),
rights  equal to B&L's  rights of access,  use,  reliance  and  reference to the
Regulatory Approvals and Regulatory Filings,  subject to B&L's right to maintain
the confidentiality of its manufacturing know-how. Symbollon shall be allowed to
place any data or other information  contained in the Regulatory  Filings in its
Drug Master File, subject to B&L's right to maintain the  confidentiality of its
manufacturing  know-how.  Copies  of all  documents,  data or other  information
(including  all minutes of meetings  held or  memoranda of  conversations  with)
filed with, or received  from, any  regulatory  agency  pursuant to the terms of
this Article 5 shall be provided to Symbollon when filed with, or received from,
any such agency.  Symbollon agrees to use its Reasonable  Commercial  Efforts to
provide  B&L with  equivalent  rights  from any other  licensee  of  Symbollon's
intellectual property.


                           Article 6 - Sale of Patent

         6.1 Transfer of Patent  Rights.  Subject to the terms and conditions of
this Agreement,  on the Effective Date Symbollon  shall assign all right,  title
and interest in the Patent Rights to B&L by executing and  delivering to B&L the
patent  assignment in the form attached hereto as Exhibit D. Symbollon agrees to
execute any and all  documents  necessary  to  effectuate  such  transfer of the
Patent Rights to B&L.


<PAGE>

         6.2 Installment Sale Payments. In partial consideration of the transfer
of all right, title and interest in the Patent Rights to B&L hereunder, B&L will
pay the following amounts to Symbollon:

                  (a) [* INDICATES THAT MATERIAL HAS BEEN OMITTED AND 
         CONFIDENTIAL TREATMENT HAS BEEN REQUESTED THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the execution of this Agreement; plus

                  (b)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.]  upon the earlier of (i) the twelve (12) month  anniversary  of
         the  Effective  Date or (ii) ten (10) days after the first filing of an
         IND for any indication of a Product; plus

                  (c)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the earlier of (i) the twenty-four (24) month  anniversary
         of the  Effective  Date,  (ii) ten (10) days after the  completion of a
         Phase I clinical trial of a Product  signified by the submission of the
         Phase I data to FDA, or (iii) ten (10) days after the  enrollment  of a
         first patient in a Phase I/II or Phase II clinical  trial of a Product;
         plus

                  (d)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the earlier of (i) the thirty-six  (36) month  anniversary
         of the  Effective  Date,  (ii) ten (10) days after the  completion of a
         Phase II clinical trial of a Product signified by the submission of the
         Phase II data to FDA, or (iii) ten (10) days after the  enrollment of a
         first  patient  in a Phase  II/III  or Phase  III  clinical  trial of a
         Product; plus

                  (e)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the earlier of (i) the forty-eight (48) month  anniversary
         of the Effective  Date or (ii) ten (10) days after the  enrollment of a
         first  patient  in a Phase  III or  Phase  II/III  clinical  trial of a
         Product; plus

                  (f)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the earlier of (i) the seventy-two (72) month  anniversary
         of the  Effective  Date or (ii) ten (10) days after the first filing of
         an NDA for any indication of a Product; plus

                  (g)  [*   INDICATES   THAT   MATERIAL  HAS  BEEN  OMITTED  AND
         CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED
         MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION PURSUANT TO RULE
         24b-2.] upon the earlier of (i) the eighty-four (84) month  anniversary
         of the Effective Date or (ii) ten (10) days after the first approval to
         market by the FDA of a Product which approval is for any indication(s).

It is the parties  intent that  multiple  payments will be made by B&L if two or
more milestones occur simultaneously.

         6.3  Orphan  Drug  Products.   To  the  extent  that  B&L  pursues  the
development and commercialization of Orphan Drug Product(s) in parallel with the
development and  commercialization  of Non-Orphan Drug Product(s) which requires
FDA's approval to market,  the parties agree that the installment  sale payments
in  Section  6.2 shall be  governed  by the  development  and  commercialization
activities  relating to the  Non-Orphan  Drug  Product(s).  Notwithstanding  the

<PAGE>

above, on each anniversary of the Effective Date after the first commercial sale
of an Orphan Drug Product the then  aggregate  future  unpaid  installment  sale
payments shall be paid by B&L to Symbollon in accordance with the following: the
sum of (i) the  aggregate  future  unpaid  installment  sale  payments  less any
portion of such  installment  sales  payments  previously  paid pursuant to this
Section 6.3  multiplied by (ii) the  aggregate  Net Sales  relating to off-label
uses of the Orphan Drug  Product(s)  divided by [* INDICATES  THAT  MATERIAL HAS
BEEN OMITTED AND CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH
OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION  PURSUANT TO RULE
24b-2.]. B&L's obligation to accelerate the payment of installment sale payments
in this Section 6.3 shall not in any way be construed to delay B&L's  obligation
to make  installment  sale payments in accordance with any other Section of this
Agreement.

         6.4  Cosmetic  Eye Scrub  Product.  To the extent  that B&L pursues the
development and commercialization of a Product which is sold as an eye scrub and
does not require FDA's approval to market the parties agree that the development
and  commercialization  activities  relating to such a  non-regulated  eye scrub
Product  will not  accelerate  B&L's  obligation  to make the  installment  sale
payments  in Section  6.2,  as and if  required,  in  accordance  with any other
Section of this Agreement.

         6.5 Negative Covenants.  Except as otherwise permitted herein,  without
Symbollon's prior written consent which shall not be unreasonably  withheld, B&L
shall not, directly or indirectly, sell, transfer or assign the Patent Rights or
any interest  therein except in conjunction with an assignment of this Agreement
pursuant  to Article  15, and B&L shall not,  directly  or  indirectly,  create,
incur,  assume or suffer to exist any lien,  security interest or encumbrance of
any nature on the Patent  Rights other than as may be incurred  (and removed) in
the ordinary course of business.

                              Article 7 - Royalties

         7.1 Royalties. In addition to all other amounts due hereunder, B&L will
pay  Symbollon  with  respect  to each  calendar  quarter a royalty  equal to [*
INDICATES  THAT  MATERIAL HAS BEEN OMITTED AND  CONFIDENTIAL  TREATMENT HAS BEEN
REQUESTED THEREFOR. ALL SUCH OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE
COMMISSION  PURSUANT  TO RULE  24b-2.]  of Net  Sales of  Products  during  such
quarter.   Such  royalties   shall  be  payable  as  prescribed  in  Article  9.
Notwithstanding  anything in this Agreement to the contrary, if (i) a Product is
not at any time covered by a valid claim under the Patent  Rights,  the Licensed
Patents  or a patented  Joint  Invention  and (ii) a Generic to such  Product is
being  lawfully  sold in the  Territory  by third  party  apart from the license
granted  pursuant  to this  Agreement  (and such  Generic  is not being  sold in
contravention  of  any  governmental,  judicial  or  private  regulatory  rules,
regulations,  laws,  orders or judgments in effect in the Territory),  B&L shall
have the right to sell a Generic to such Product in the Territory  royalty free;
provided  that the original  Product sold by B&L shall remain  subject the above
referenced royalty.


<PAGE>

         7.2  Sublicense  Fees. In addition to all other amounts due  hereunder,
B&L will  reimburse  Symbollon  with  respect to each  calendar  quarter  for [*
INDICATES  THAT  MATERIAL HAS BEEN OMITTED AND  CONFIDENTIAL  TREATMENT HAS BEEN
REQUESTED THEREFOR. ALL SUCH OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE
COMMISSION PURSUANT TO RULE 24b-2.] of any amounts that Symbollon is required to
pay to any third  party due to B&L's  sublicense  of such third  party's  patent
rights during such quarter; provided that if, on a product-by-product basis, the
amount that  Symbollon is required to pay (less any amounts  reimbursed  by B&L)
third  parties due to B&L's  sublicense  of such third  parties'  patent  rights
during such  quarter  exceeds [*  INDICATES  THAT  MATERIAL HAS BEEN OMITTED AND
CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED MATERIAL
HAS BEEN FILED  SEPARATELY  WITH THE COMMISSION  PURSUANT TO RULE 24b-2.] of the
royalties  that B&L is required to pay  Symbollon  for such quarter  pursuant to
Section  7.1,  then,  in addition to the amount  determined  above that B&L will
reimburse  Symbollon,  B&L will also reimburse Symbollon for the amount by which
such third parties' payments exceeds [* INDICATES THAT MATERIAL HAS BEEN OMITTED
AND  CONFIDENTIAL  TREATMENT  HAS BEEN  REQUESTED  THEREFOR.  ALL  SUCH  OMITTED
MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION  PURSUANT TO RULE 24b-2.]
of the royalties that B&L is required to pay Symbollon for such quarter pursuant
to Section 7.1. If B&L and Symbollon  mutually agree,  which agreement shall not
be  unreasonably  withheld,  to license any additional  third party  Proprietary
Information related to a Product's composition of matter (excluding  packaging),
then any and all amounts due with respect to such license  (regardless  of which
party is  responsible  for  payment of such  amounts)  shall be governed by this
Section 7.2.

         7.3 Overall Value.  Because Symbollon's  Proprietary  Information is an
integral  part of the  license  granted  to B&L under  this  Agreement,  precise
apportionment of royalties and other  considerations  with respect to the Patent
Rights,  the  Licensed  Patents  and  Symbollon's   Proprietary  Information  is
impossible. Accordingly, royalties and other consideration have been agreed upon
as set forth herein.


            Article 8 - Symbollon Sale of Products Outside Territory

         If  Symbollon  sells  Products  and/or  any  other   product(s)   which
incorporate  and/or rely on a Joint Invention and/or B&L's Regulatory Filings or
Regulatory  Approvals  outside the Territory,  either directly or in conjunction
with a third  party,  Symbollon  shall  pay B&L with  respect  to each  calendar
quarter a royalty  equal to [*  INDICATES  THAT  MATERIAL  HAS BEEN  OMITTED AND
CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED MATERIAL
HAS BEEN FILED  SEPARATELY  WITH THE COMMISSION  PURSUANT TO RULE 24b-2.] of (i)
the amount  received by Symbollon from the Gross Profits of such  Products(s) or
product(s) and,  without  duplication,  (ii) all amounts  received and all other
consideration  received (when in a form other than cash or its  equivalent,  the
fair market  value  thereof  when  received) by Symbollon by reason of the sale,
license,  distribution  or use of such  Product(s) or  product(s),  in each case
during such quarter and subject to the following  limitations:  (a) for purposes
of calculating  the preceding  royalty amount no royalties  shall be paid on any
moneys paid to Symbollon by a third party expressly  intended for the additional
direct formulation and/or technical development,  nor on any manufacturing costs
of  Product(s)  or  product(s)  and (b) in no event  shall  Symbollon's  royalty
payments  owed under this Article 8 exceed [* INDICATES  THAT  MATERIAL HAS BEEN
OMITTED AND CONFIDENTIAL TREATMENT HAS BEEN REQUESTED THEREFOR. ALL SUCH OMITTED
MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION  PURSUANT TO RULE 24b-2.]
in the aggregate.



<PAGE>

                              Article 9 - Payments

         9.1 Timing of Royalty Payments. Royalties payable under Section 7.1 and
Article 8 will be paid without deduction, counterclaim or set-off not later than
forty-five  (45)  calendar days  following the end of each calendar  quarter and
each such  payment  shall be  accompanied  by a report in  writing  showing  the
calendar  quarter for which such payment  applies,  the applicable Net Sales for
the calendar quarter,  the calculations used to compute said amounts,  including
the  quantity and  description  of the  Product(s)  (and/or  products),  and the
royalties due on such Net Sales.

         9.2  Records  of Net  Sales.  Each  party  shall  keep  and  cause  its
Affiliates and permitted  sublicensees  to keep,  true and accurate  records and
books of account  containing  data  reasonably  required for the computation and
verification of payments to be made as provided by this Agreement, which records
and books shall be open for inspection  upon  reasonable  notice during business
hours by  either  the  other  party's  auditor(s)  or an  independent  certified
accountant  selected by such party,  except one to whom the party whose  records
are being inspected has a reasonable objection, for the purpose of verifying the
amount of payments due and payable.  Such  auditor(s) or  independent  certified
accountant shall keep confidential  (under written obligation of confidentiality
reasonably  acceptable to the other party) any information  obtained during such
examination  and shall  report  to the party  auditing  such  records  only that
information  required to be provided hereunder.  Said right of inspection may be
exercised not more than once in any calendar  year, but will exist for three (3)
years from the date of origination of any such record,  and this requirement and
right of  inspection  shall  survive  any  termination  of this  Agreement.  The
inspecting  party shall be  responsible  for all expenses of its  auditor(s)  or
independent  accountants associated with such inspection.  However, in the event
that such inspection  reveals an underpayment of amounts due hereunder in excess
of ten percent (10%),  then said inspection shall be at the expense of the party
whose records are being inspected and the amount of such underpayment shall bear
interest at the rate of ten percent (10%)  annually,  commencing on the date the
obligation  to pay  such  underpayment  initially  accrued  hereunder.  If  such
inspection  reveals an  overpayment  hereunder,  the parties  shall  credit such
overpayment against the next payment due hereunder.

         9.3  Payments.  Any payments to be made by one party to the other under
this Agreement will be paid in U.S. dollars at a rate of exchange as of the last
business day of the period to which such  payment  applies as quoted in the Wall
Street Journal or an equivalent published rate as agreed by the parties.



<PAGE>

                   Article 10 - B&L's Exclusivity Obligations

         During the term of this Agreement,  B&L will not directly or indirectly
research,  develop  and/or  commercialize  iodine-based  products for use in the
Field except with Symbollon pursuant to this Agreement;  provided,  that B&L may
further  develop and  commercialize  iodine-based  products  not covered by this
Agreement which are developed by an existing  Affiliate of B&L, so long as prior
written  notice is provided by B&L to  Symbollon  of such  iodine-based  product
development and  commercialization  efforts.  Furthermore,  nothing herein shall
prohibit  existing  Affiliates  of B&L from  developing  and/or  commercializing
iodine-based  products  not  covered by this  Agreement.  After B&L has made the
payments required pursuant to Section 6.2(a) through (g), B&L may develop and/or
commercialize  iodine-based  products  for use in the Field not  covered by this
Agreement  which are based on  technology  in-licensed  by B&L from an unrelated
third party. If B&L decides to in-license an unrelated third party's  technology
to develop and/or commercialize  iodine-based products for use in the Field, B&L
will  provide  Symbollon  will  prior  written  notice  of such  action.  If B&L
commercializes an iodine-based  product for use in the Field not covered by this
Agreement  which is based on  technology  in-licensed  by B&L from an  unrelated
third party, Symbollon will, in its sole discretion, have the right to terminate
this Agreement either in whole or in part (by reducing the scope of the Field on
a Product  by  Product  basis),  and such  termination  shall be deemed to be by
Symbollon pursuant to Section 16.2 for purposes of this Agreement.


                  Article 11 - Confidentiality and Publications

         11.1  Proprietary  Information.  All Proprietary  Information  which is
disclosed by one party to the other during the term of this  Agreement  shall be
maintained in  confidence  by the receiving  party and shall not be disclosed by
the  receiving  party to any other  person,  firm,  or agency,  governmental  or
private,  without the prior written consent of the disclosing  party,  except to
the extent that such Proprietary Information:

         (a)      with regard to  Inventions  assigned to Symbollon  pursuant to
                  Section  12.2(a)  and Joint  Inventions,  is  necessary  to be
                  disclosed  by Symbollon  to agents,  consultants  and/or other
                  third parties for the research,  development  and/or marketing
                  of products, which entities first agree in writing to be bound
                  by  the   confidentiality   obligations   contained   in  this
                  Agreement, or
         (b)      is required to be disclosed to governmental  agencies in order
                  to gain approval to sell Products, or
         (c)      is necessary to be  disclosed  to agents,  consultants  and/or
                  other  third  parties  for the  research,  development  and/or
                  marketing of Products,  which  entities first agree in writing
                  to be bound by the  confidentiality  obligations  contained in
                  this Agreement.


<PAGE>

The confidentiality  obligations of the parties hereunder shall continue in full
force and effect for a period of five (5) years  following  the  termination  of
this Agreement.

         11.2 Joint  Disclosures.  B&L and  Symbollon  will jointly  discuss and
agree on the release of any statement to the public  regarding the execution and
the subject  matter of this  Agreement,  the details of research to be conducted
under this Agreement,  or any other material term of this Agreement,  subject in
each case to  disclosure  otherwise  required  by law or  regulation,  including
applicable securities laws.


                 Article 12 - Ownership of Intellectual Property

         12.1 General  Intent.  In furtherance  of the research and  development
work to be  conducted  pursuant to the Project Plan and subject to the terms set
forth  herein,  the parties will  exchange  Proprietary  Information.  Except as
expressly  set forth  herein,  no licenses or other  transfers of ownership  are
granted under this Agreement,  and each party shall retain all right,  title and
interest to its Proprietary Information.

         12.2 New Inventions. All Inventions which are made, or acquired, by B&L
during the term of this Agreement will be owned as follows:

         (a)      Inventions by B&L.  Any Invention made by B&L during the term 
                  of this Agreement shall be owned by and assigned to Symbollon 
                  if, and only if, such Invention pertains to (i) any multi-part
                  system which forms a composition containing from 5 to in 
                  excess of 300 ppm of diatomic iodine (I2), or (ii) the use of 
                  excipients used in combination with such compositions that 
                  modify the properties of said compositions including, by way 
                  of example, decolorizers, reducing agents, sequestrants, 
                  potentiators or viscosifiers; provided, that any Invention 
                  related solely to technology acquired by B&L from an unrelated
                  third party, other than Symbollon, shall not be included.  Any
                  and all such Inventions will be included within the license 
                  granted to B&L pursuant to Section 4.1.

         (b)      Joint  Inventions.  Any  Invention  which  is  made  by  B&L's
                  personnel in conjunction  with  Symbollon's  personnel and not
                  covered  by  subsection  (a) of this  Section  12.2 (a  "Joint
                  Invention")  shall be owned by and assigned to (i)  Symbollon,
                  if, and only if, such  Invention  pertains to iodine,  and any
                  and all such  Inventions  will be included  within the license
                  granted to B&L  pursuant to Section  4.1 or (ii) B&L,  if, and
                  only if, such  Invention  pertains to any Joint  Invention not
                  covered by the preceding clause (i).


<PAGE>

         12.3 Symbollon's  Rights in B&L's Joint  Inventions.  B&L hereby grants
Symbollon a  permanent,  exclusive  license  (which  license  shall  survive any
termination of this  Agreement) to practice under the Patent Rights  transferred
to B&L pursuant to Section 6.1 and to make, use and sell products utilizing such
Patent  Rights  outside  the  Field  subject  to  Sections  4.4  and  4.5  on  a
royalty-free   basis.   Further,   B&L  hereby  grants  Symbollon  a  permanent,
non-exclusive  license  (which  license  shall survive any  termination  of this
Agreement)  to practice any Joint  Invention  owned by B&L and to make,  use and
sell products  utilizing any such Joint Invention  outside the exclusive license
granted to B&L  hereunder  for all other  applications  (excluding  contact lens
care) on a royalty-free  basis.  In addition,  B&L agrees to disclose and hereby
grants a permanent, non-exclusive, license to Symbollon to practice any patented
invention  (including  any  Invention) of B&L relating to a method of dispensing
iodine  compositions  developed  or  acquired  by B&L  during  the  term of this
Agreement  outside  the Field (as  defined  on the  Effective  Date),  excluding
contact  lens  care,  in the  Territory  and for  any  application  outside  the
Territory  for a royalty of [*  INDICATES  THAT  MATERIAL  HAS BEEN  OMITTED AND
CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED MATERIAL
HAS BEEN FILED  SEPARATELY  WITH THE COMMISSION  PURSUANT TO RULE 24b-2.] of Net
Sales of products received by Symbollon or its sublicensees  incorporating  such
invention.

         12.4  License  Upon  Termination.   In  the  event  this  Agreement  is
terminated by B&L for cause  pursuant to Section 16.2,  Symbollon  hereby grants
B&L a fully  paid-up,  permanent,  non-exclusive  license to practice  under any
Invention  covered by  Section  12.2(a)  or Joint  Invention  covered by Section
12.2(b) owned by Symbollon and to make, use and sell products utilizing any such
Invention  covered by  Section  12.2(a)  or Joint  Invention  covered by Section
12.2(b) in the Field in the Territory.

         12.5 Patent Applications.  Each party shall have the right, in its sole
discretion,  and at its sole expense,  to file,  prosecute  and maintain  patent
applications  and the patents  relating thereto with respect to Inventions owned
by it.  During the term of this  Agreement,  each  party  will  notify the other
before it files any patent  application that makes claims within the Field. Each
party  shall  cooperate  with  the  other  to  execute  all  lawful  papers  and
instruments and to make all rightful oaths and  declarations as may be necessary
in the preparation  and  prosecution of all such patents and other  applications
and protections relating to an Invention referred to in Section 12.2.

         12.6 Disputes.  Any dispute  relating to the ownership of Inventions or
any other issue relating to a party's  rights or obligations  under this Article
12 which can not be decided  by good faith  negotiations  between  the  parties,
shall be resolved by arbitration pursuant to Section 18.3.


                Article 13 - Warranties/Indemnification/Insurance

         13.1 Representations and Warranties. Each party represents and warrants
to the other that (a) it has the full  right,  power and  authority  to execute,
deliver and perform this  Agreement,  and (b) the terms of this Agreement do not
conflict  with any other  agreement,  order or judgment to which such party is a

<PAGE>

party or by which it is bound. Symbollon represents and warrants to B&L that, to
the best of its knowledge as of the Effective  Date,  there are no third parties
who are infringing the Patent Rights or the Licensed  Patents existing as of the
Effective Date; the practice of the Patent Rights,  the Licensed  Patents and/or
Symbollon's  Proprietary  Information  in the  Territory  does not  infringe any
rights of third parties;  and Symbollon has  prosecuted all patent  applications
within  the Patent  Rights in good  faith and has no reason to believe  that any
claims within the Patent Rights and the Licensed Patents would be invalid.

         13.2.  Disclaimer.  No license is granted except as expressly  provided
herein,  and no license in addition thereto shall be deemed to have arisen or be
implied by way of estoppel or otherwise.  EXCEPT AS OTHERWISE  PROVIDED  HEREIN,
SYMBOLLON  DOES NOT WARRANT THE  VALIDITY OF THE PATENT  RIGHTS OR THE  LICENSED
PATENTS AND MAKES NO  REPRESENTATION  WHATSOEVER WITH REGARD TO THE SCOPE OF THE
PATENT RIGHTS OR THE LICENSED PATENTS.


         13.3     Additional Covenants.

                  (a) B&L. B&L covenants and agrees with  Symbollon that (a) B&L
         shall take all  Reasonable  Commercial  Efforts  within its  control to
         develop and commercialize  Products,  (b) all Products  manufactured by
         B&L  shall  conform  to  applicable   Regulatory   Approvals  and  Good
         Manufacturing  Practices of the FDA, (c) B&L shall exert its Reasonable
         Commercial  Efforts to manufacture,  promote,  sell and distribute each
         and every Product which receives  Regulatory  Approval for marketing in
         the Territory, and (d) B&L shall take all Reasonable Commercial Efforts
         within its control to prohibit  use of any Product for any  application
         outside the Field.

                  (b)  Symbollon.  Symbollon  covenants and agrees with B&L that
         Symbollon  shall  take all  Reasonable  Commercial  Efforts  within its
         control  (including  requiring its licensee(s) to so agree) to prohibit
         use of any of its products in the Territory for any application  inside
         the Field.

         13.4  Indemnification.  Each  party  shall  indemnify,  defend and hold
harmless the other party,  its  directors,  officers,  employees  and agents and
their respective  successors,  heirs and assigns (the "Indemnitees") against any
liability,  damage,  loss or expense (including  reasonable  attorneys' fees and
expenses of litigation) incurred by or imposed upon the Indemnitees,  or any one
of them, in connection  with any claims,  suits,  actions,  demands or judgments
relating  to,  or  arising  out of (a) any  breach of the  indemnifying  party's
representations,   warranties,   agreements  or  covenants  in  this  Agreement,
including  without  limitation  the  confidentiality  obligations  set  forth in
Article 11, and (b) any other  activities to be carried out by the  indemnifying
party,  its  Affiliate(s)  or agents under this  Agreement  (including,  without
limitation,  with  respect to B&L,  the design,  clinical  testing,  production,

<PAGE>

manufacture, sale, use, release or promotion by B&L or by any Affiliate or agent
of B&L, of any Product or process or service relating thereto).

         13.5  Insurance.  At all such  times as any  Product  is being  tested,
distributed or sold by B&L or any Affiliate,  sublicensees or agents of B&L, B&L
shall,  at its sole cost and expense,  procure and maintain  policies of product
liability  insurance in such scope and  coverage  consistent  with  commercially
reasonable practices normally exercised under similar  circumstances  consistent
with good business judgment.  B&L shall provide Symbollon with written notice of
such insurance  coverage upon request by Symbollon.  B&L shall provide Symbollon
with  written  notice  immediately  upon receipt by B&L of notice of any pending
cancellation, non-renewal or material change in such insurance, and shall obtain
replacement   insurance   providing   comparable  coverage  prior  to  any  such
cancellation,  non-renewal or material  change.  B&L shall maintain such product
liability  insurance  beyond the  expiration or  termination  of this  Agreement
during (a) the period that any Product or process or service relating thereto is
being tested,  distributed  or sold by B&L or by any  Affiliate,  sublicensee or
agent of B&L and (b) a  reasonable  period  after the period  referred to in the
preceding clause (a).

         13.6 Additional Indemnification Obligations. In the event any action is
commenced or claim made or threatened  against one or more of the Indemnitees as
to which a party to this  Agreement  may be obligated to indemnify it or them or
hold it or them harmless, such Indemnitee(s) shall promptly notify such party of
such  event.  Such party shall  assume the defense of, and may settle  (with the
applicable  Indemnitee's consent, such consent not to be unreasonably withheld),
with counsel of its own choice (reasonably acceptable to the other party to this
Agreement and the applicable  Indemnitee(s))  and at its sole expense such claim
or action.  Any Indemnitee  may  participate in the defense of any such claim or
action  with  counsel of its own choice at its own  expense.  No party  shall be
liable to the other party or other Indemnitee(s) on account of any settlement of
any such claim or action effected without its prior written consent, which shall
not be  unreasonably  withheld.  Notwithstanding  any  provision  herein  to the
contrary,  B&L shall take no action  relating to, and Symbollon may withhold its
consent in its sole discretion to, the settlement of any matter which may affect
the Patent Rights, the Licensed Patents or Symbollon's Proprietary  Information;
provided that if Symbollon withholds its consent, then Symbollon agrees to share
thereafter 50/50 in any subsequent expenses  attributable to such claims made or
settlement  paid by B&L,  including  without  limitation  fees  paid to  outside
counsel or a consultant,  and reasonable travel expenses,  but not including any
part of any salary of any employee of B&L.


<PAGE>

                    Article 14 - Infringement and Trademarks

         14.1 Notice of Infringement. Each party shall promptly notify the other
in  writing of any  infringement  of a patent  within  the Patent  Rights or the
Licensed  Patents of which they  become  aware in the Field.  During the term of
this Agreement, Symbollon shall have the first right at its expense to institute
and control all actions  brought for  infringement  of the Patent  Rights or the
Licensed  Patents  when,  in  Symbollon's  sole  judgment,  such  action  may be
reasonably  necessary,  proper and justified.  In the event  Symbollon  declines
within ninety (90) days of its receipt of such notice of  infringement to either
(a) cause  infringement to cease or (b) initiate legal  proceedings  against the
infringer,  B&L may upon notice to Symbollon initiate legal proceedings  against
the infringer in the Field in the Territory at B&L's expense.

         14.2 Control,  Cost and  Cooperation in  Infringement  Actions.  In the
event either party shall  initiate or carry on legal  proceedings to enforce the
Patent  Rights or the  Licensed  Patents  covered by this  Article 14, the other
party shall be offered at the outset of such proceedings an opportunity to share
50/50 in all related expenses of such proceedings,  including without limitation
fees paid to outside counsel or a consultant,  and reasonable  travel  expenses,
but not including  any part of any salary of any employee of such party.  In the
event either party shall  initiate or carry on legal  proceedings to enforce the
Patent Rights or the Licensed  Patents against an alleged  infringer,  the other
party shall fully cooperate with, and supply all reasonable assistance requested
by,  the party  initiating  or  carrying  on such  proceedings.  The party  that
institutes  any suit to  protect or enforce  the Patent  Rights or the  Licensed
Patents  shall have  control  of that  suit,  subject to the rights of the other
party to be kept informed of all material  decisions relating to such suit prior
to their implementation, and shall bear the reasonable expenses incurred by said
other  party in  providing  such  assistance  and  cooperation  as is  requested
pursuant to this Section.  Notwithstanding any provision herein to the contrary,
(a) legal  proceedings  initiated  or carried on by B&L shall be in B&L's  name,
provided that Symbollon shall permit proceedings to be brought and maintained in
its name or shall  permit  Symbollon  to be  joined  as a party to an  action if
required  by  law  and  (b)  in no  event  shall  there  be a  settlement  of an
infringement  action  relating  to the  Patent  Rights or the  Licensed  Patents
without the prior  written  consent of  Symbollon,  which  consent  shall not be
unreasonably withheld.

         14.3  Recoveries  Against  Infringer.  Any recovery  obtained by either
party as the result of legal  proceedings  covered by this Article 14 to enforce
the Patent Rights or the Licensed Patents in the Field in the Territory  against
an alleged  infringer,  whether  obtained  by  settlement  or  otherwise,  shall
allocated  between the parties in accordance  with their sharing of the expenses
of such proceedings.


<PAGE>

         14.4 Trademarks.  During the term of this Agreement, B&L shall have the
right to promote and sell Products  under the license  granted to it pursuant to
Section 4.1 under  trademarks  selected by B&L,  which  trademarks  shall be and
remain,  subject to Section 16.4, the property of B&L.  Symbollon  agrees not to
register and own any such trademarks outside the Territory.


                           Article 15 - Assignability

         Except as expressly set forth in this  Agreement,  this Agreement shall
not be assignable by B&L without the prior written consent,  which consent shall
not be unreasonably  withheld,  of Symbollon and any attempt to assign (directly
or  indirectly)  this  Agreement,  without such  consent  shall be void from the
beginning.  B&L may assign this  Agreement  without  Symbollon's  consent to any
purchaser  of, or successor in interest  to, all or  substantially  all of B&L's
business to which this Agreement relates if, and only if, the intended successor
or  purchaser  agrees in writing  (a) to accept and be bound by all of the terms
and conditions of this Agreement and (b) to devote at least the same efforts and
resources  to  performance  hereunder  as B&L  exerted  immediately  before  the
assignment.  Symbollon  may assign this  Agreement  if such  assignee  agrees in
writing  to  accept  and be bound by all of the  terms  and  conditions  of this
Agreement.


                        Article 16 - Term and Termination

         16.1 Term.  This Agreement will become  effective on the Effective Date
and, unless terminated under another specific provision of this Agreement,  will
remain  in  effect  until,  and  terminate  upon  the  later to occur of (i) the
expiration of the Patent Rights or the Licensed Patents (excluding any patent or
patent  application  covering an  Invention  assigned to  Symbollon  pursuant to
Section  12.2(a)) or (ii) the seventeenth  (17th)  anniversary of this Agreement
(the "Initial  Term");  provided that the Initial Term of this Agreement will be
further  extended if an Invention  is assigned to Symbollon  pursuant to Section
12.2(a) which  Invention was conceived by B&L prior to the fifth  anniversary of
this  Agreement by the earlier to occur of (a) the  expiration  of any patent or
patent  application  covering such Invention  assigned to Symbollon  pursuant to
Section  12.2(a)  which  Invention  was  conceived  by B&L  prior  to the  fifth
anniversary of this Agreement or (b) the fifth (5th)  anniversary of the Initial
Term of this Agreement.  If, and only if, this Agreement  terminates pursuant to
this  Section  16.1,  B&L  shall be  entitled  to sell  Products  developed  and
commercialized  during the term of this  Agreement in the Field in the Territory
royalty free of any license for Symbollon's know-how to develop such Products.

         16.2 Termination  Events . Upon the occurrence of any of the events set
forth below, either party, as applicable, shall have the right to terminate this
Agreement by giving written notice of termination,  to be effective as described
herein:


<PAGE>

                  (a)  non-payment of any amount payable to such party hereunder
         continuing  ten (10) calendar  days after receipt of written  notice of
         such non-payment;

                  (b) failure by the other party in any material  respect (other
         than  matters  which are  covered  by clause  (a)  above) to observe or
         perform any of the  provisions  of this  Agreement on the other party's
         part to be  observed  or  performed,  if such  failure is not  remedied
         within thirty (30)  calendar  days after  receipt of notice  specifying
         such failure;

                  (c) if the other  party (i)  applies  for or  consents  to the
         appointment  of a receiver,  trustee or liquidator of it or of all or a
         substantial part of its assets, (ii) admits in writing its inability to
         pay its debts as they mature,  (iii) makes a general assignment for the
         benefit of creditors,  (iv) is adjudicated a bankrupt or insolvent, (v)
         files a  voluntary  petition in  bankruptcy  or a petition or an answer
         seeking  reorganization  or  an  arrangement  with  creditors  to  take
         advantage of any  insolvency  law or any answer  admitting the material
         allegations  of  the  petition  filed  against  it in  any  bankruptcy,
         reorganization or insolvency  proceeding or (vi) takes corporate action
         for the purpose of effecting any of the foregoing; and

                  (d) an order or judgment or decree  shall be entered,  without
         the application,  approval or a consent of the other party by any court
         of competent jurisdiction,  approving a petition seeking reorganization
         of such party or  appointing a receiver,  trustee or liquidator of such
         party,  or all or a  substantial  part of its  assets  and such  order,
         judgment or decree shall continue unstayed and in effect for any period
         of sixty (60) consecutive days.

         16.3  Termination  by B&L. B&L may terminate  this  Agreement by giving
Symbollon a notice of termination  to be effective  upon a termination  date set
forth by B&L in such  notice,  which  termination  date shall not be sooner than
sixty (60) days  after the date of the  written  notice if given  prior to being
obligated to make the payment required in Section 6.2(b), ninety (90) days after
the date of the written  notice if given  after the payment  required in Section
6.2(b) and prior to being  obligated  to make the  payments  required in Section
6.2(c)  through  (g),  and  anytime  after  being  required  to make  all of the
foregoing  payments,  B&L shall not have any rights to terminate  this Agreement
pursuant to this Section 16.3.  Such notice shall be deemed by the parties to be
final and,  immediately  upon receipt of such notice of  termination,  Symbollon
shall  have the right to begin  negotiations,  and enter into  agreements,  with
others  concerning  Products,  the  Patent  Rights,  the  Licensed  Patents  and
Symbollon's Proprietary Information in the Field.

         16.4  Effects  of  Termination.  If this  Agreement  is  terminated  by
Symbollon pursuant to Section 16.2 or by B&L pursuant to Section 16.3, upon such
termination,  the Patent  Rights,  and all  Regulatory  Filings  and  Regulatory
Approvals  then owned by B&L with  respect to any  Product  being  developed  or

<PAGE>

commercialized shall be assigned to Symbollon without charge and free of any and
all liens, claims, security interests and other encumbrances (except as may have
been  incurred in the ordinary  course of business  and if so incurred,  must be
removed by B&L, at its sole cost and  expense,  prior to transfer or upon notice
thereof),  and B&L  agrees  to  execute  all such  further  documents  as may be
reasonably  required to effect such assignment.  If this Agreement is terminated
by B&L pursuant to Section 16.2, upon such  termination,  the Patent Rights then
owned by B&L shall be assigned to Symbollon  without  charge and free of any and
all liens, claims, security interests and other encumbrances (except as may have
been  incurred in the ordinary  course of business  and if so incurred,  must be
removed by B&L, at its sole cost and  expense,  prior to transfer or upon notice
thereof),  and B&L  agrees  to  execute  all such  further  documents  as may be
reasonably  required to effect such  assignment.  No exercise by either party of
any right of  termination  shall  constitute a waiver of any right of that party
for recovery of any monies then due to it hereunder or any other right or remedy
such party may have at law, in equity or under this Agreement.

         16.5 Survival.  Termination of this Agreement for whatever reason shall
be without  prejudice to the  settlement  of the rights and  obligations  of the
parties  arising  out of  this  Agreement  prior  to the  date  of  termination,
including,  without limitation:  (a) obligations to pay royalties and other sums
accruing  hereunder,  (b) the  right to  complete  the  manufacture  and sale of
Products  which  qualify as "work in  process"  under  generally  accepted  cost
accounting  standards  or  which  are in stock  at the  date of  termination  or
returned  to stock  after the date of  termination,  and the  obligation  to pay
royalties on Net Sales of such Products,  (c) obligations for record keeping and
accounting  reports for so long as Products are sold  pursuant to the  preceding
clause (b),  (d) the right to inspect  books and records as described in Section
9.2, (e)  obligations of insurance,  defense and indemnity under Article 13, (f)
any cause of action or claim  accrued  or to  accrue  because  of any  breach or
default by the other party hereunder,  (g) obligations of confidentiality  under
Article 11, (h) obligations upon termination to transfer the Patent Rights,  and
all trademarks,  Regulatory  Filings and Regulatory  Approvals then owned by B&L
under Section 16.4 and (g) all of the terms, provisions, representations, rights
and obligations  contained in this Agreement that by their sense and context are
intended to survive until performance thereof by either or both parties.

                       Article 17 - Supply and Manufacture

         B&L will have the exclusive  right to manufacture or have  manufactured
Products in the Field for sale within the  Territory.  Subject to execution of a
supply  agreement  mutually  acceptable  to both  parties,  Symbollon  shall  be
entitled  to  purchase   Product   from  B&L   (subject  to  facility   capacity
constraints),  if B&L is the manufacturer of such Product,  at [* INDICATES THAT
MATERIAL  HAS  BEEN  OMITTED  AND  CONFIDENTIAL  TREATMENT  HAS  BEEN  REQUESTED
THEREFOR.  ALL  SUCH  OMITTED  MATERIAL  HAS  BEEN  FILED  SEPARATELY  WITH  THE
COMMISSION PURSUANT TO RULE 24b-2.],  without duplication of any expense. If B&L
is not the manufacturer of such Product,  B&L will use  commercially  reasonable
efforts to obtain for Symbollon the right to purchase such Product directly from

<PAGE>

B&L's  manufacturing  source at [* INDICATES  THAT MATERIAL HAS BEEN OMITTED AND
CONFIDENTIAL  TREATMENT HAS BEEN REQUESTED  THEREFOR.  ALL SUCH OMITTED MATERIAL
HAS  BEEN  FILED  SEPARATELY  WITH  THE  COMMISSION  PURSUANT  TO RULE  24b-2.].
Notwithstanding any provision in this Agreement to the contrary, Symbollon shall
have  the  right  to  manufacture  or  have  manufactured  Products  inside  the
Territory, provided, that such Products are sold outside the Territory.


                           Article 18 - Miscellaneous

         18.1 Notices.  Any notice or other communication to be given under this
Agreement  shall be in writing  and shall be deemed to have been duly given when
delivered  personally  or  deposited  in the United  States  mail,  certified or
registered with return receipt,  or sent by courier  requiring proof of receipt,
addressed as follows:

         To Symbollon:

                           Symbollon Corporation
                           37 Loring Drive
                           Framingham, MA  01702
                           Telephone:  (508)-620-7676
                           Fax:  (508)-620-7111
                           Attention:  President

          With a copy to:

                           William P. Gelnaw, Jr., Esq.
                           Choate, Hall & Stewart
                           Exchange Place
                           53 State Street
                           Boston, MA  02109
                           Telephone:  (617)-248-5000
                           Fax:  (617)-248-4000

          To B&L:

                           Bausch & Lomb Pharmaceuticals, Inc.
                           8500 Hidden River Parkway
                           Tampa, FL  33637
                           Telephone:  (800) 227-1427
                           Fax:  (813) 975-7774
                           Attention:  President



<PAGE>

          With copy to:

                           Bausch & Lomb, Incorporated
                           One Bausch & Lomb Place
                           Rochester, N.Y.  14604-2701
                           Telephone:  (716) 338-8600
                           Fax:  (716) 338-8017
                           Attention:  General Counsel

or to such other  address as either  party shall  designate  by written  notice,
similarly  given,  to the  other  party.  If sent by telex,  facsimile  or other
electronic media, an original  confirmation copy must be sent within thirty days
by means listed above.

         18.2 Governing Law; Jurisdiction and Venue. With regard to any claim or
controversy  initiated  by B&L related to this  contract or any breach  thereof,
this  Agreement  shall be governed by the internal laws of The  Commonwealth  of
Massachusetts (without regard to conflict of law provisions), and with regard to
any claim or controversy  initiated by Symbollon related to this contract or any
breach  thereof,  this  Agreement  shall be governed by the internal laws of the
State of New York (without  regard to conflict of law  provisions);  except that
questions  affecting  the  construction  and  effect  to  any  patent  shall  be
determined by the law of the country in which the patent has been  granted.  Any
claim or  controversy  arising out of or related to this  contract or any breach
thereof,  except as provided  under Section  18.3,  shall be submitted to United
States District Court, District of Massachusetts if such claim or controversy if
initiated by B&L and to United States  District  Court,  District of New York if
such claim or  controversy  if initiated by  Symbollon,  and the parties  hereby
consent to the jurisdiction and venue of such courts.

         18.3  Limited   Arbitration.   Disagreements  under  Sections  of  this
Agreement which make specific reference to this Section 18.3 shall be settled by
arbitration in accordance with the licensing  arbitration  rules of the American
Arbitration  Association by a board of arbitrators  consisting of one arbitrator
appointed by B&L, one arbitrator appointed by Symbollon,  and a third arbitrator
chosen by the mutual  agreement  of B&L and  Symbollon,  which third  arbitrator
shall be unrelated either to B&L or Symbollon.  Any arbitration  hereunder shall
be held in Boston,  Massachusetts if initiated by B&L and in Rochester, New York
if initiated by Symbollon. In such arbitration proceedings, this Agreement shall
be governed  by and  construed  according  to  Massachusetts  or New York law as
provided in Section  18.2.  Arbitration  may be  commenced at any time by either
party  hereto  giving  written  notice to the other party to a dispute that such
dispute has been referred to arbitration.  Any judgment or decision  rendered by
the panel  shall be binding  upon the parties  and shall be  enforceable  by any
court of  competent  jurisdiction.  Each  party  shall pay its own  expenses  of
arbitration  and the  expenses  of the  arbitrators  shall  be  equally  shared,
provided, however, that if in the opinion of the arbitrators any claim hereunder

<PAGE>

or any  defense or  objection  thereto was  unreasonable,  the  arbitrators  may
assess, as part of their reward, all or any part of the arbitration  expenses of
the other party  (including  reasonable  attorneys' fees) and of the arbitrators
against the party raising such unreasonable claim, defense or objection.

         18.4 Waiver.  Except as  specifically  provided for herein,  the waiver
from time to time by either  party of any of its rights or a party's  failure to
exercise any remedy shall not operate or be construed as a continuing  waiver of
same or of any  other  of such  party's  rights  or  remedies  provided  in this
Agreement.

         18.5  Enforceability.  If any  term,  covenant  or  condition  of  this
Agreement or the application  thereof to any party or circumstance shall, to any
extent, be held to be invalid or  unenforceable,  then (a) the remainder of this
Agreement, or the application of such term, covenant or condition to the parties
or  circumstances   other  than  those  as  to  which  it  is  held  invalid  or
unenforceable,  shall  not be  affected  thereby  and  each  term,  covenant  or
condition of this Agreement shall be valid and be enforced to the fullest extent
permitted by law; and (b) the parties covenant and agree to renegotiate any such
term,  covenant  or  application  thereof  in good  faith in order to  provide a
reasonably  acceptable  alternative  to the term,  covenant or condition of this
Agreement or the application  thereof that is invalid or  unenforceable,  and in
the event that the  parties  are unable to agree  upon a  reasonable  acceptable
alternative,  then the parties agree that a submission to  arbitration  shall be
made in accordance with Section 18.3 to establish an alternative to such invalid
or  unenforceable   term,  covenant  or  condition  of  this  Agreement  or  the
application  thereof,  it being  the  intent  that the  basic  purposes  of this
Agreement are to be effectuated.

         18.6 Entire Agreement and Amendment. This Agreement contains the entire
understandings of the parties with respect to the matters contained herein,  and
supersedes all prior agreements,  oral or written,  and all other  communication
between them relating to the subject matter hereof. The parties hereto may, from
time to time during the continuance of this Agreement, modify, vary or alter any
of the provisions of this Agreement,  but only by an instrument duly executed by
authorized officers of both parties hereto.

         18.7  Independent  Contractor.   Nothing  herein  shall  be  deemed  to
establish a relationship  or principal and agent between B&L and Symbollon,  nor
any of their respective agents or employees,  for any purpose  whatsoever.  This
Agreement shall not be construed as constituting  B&L and Symbollon as partners,
or as creating any other form of legal  association or  arrangement  which would
impose  liability  upon one  party  for the act or  failure  to act of the other
party.

         18.8  Headings.  The  headings of the several  Articles and sections of
this  Agreement  are intended  for  convenience  of  reference  only and are not
intended  to be a part of or to affect  the  meaning or  interpretation  of this
Agreement.


<PAGE>

         18.9 Further Instruments. Each party agrees to execute, acknowledge and
deliver  such  further  instruments  and to do all such  further  acts as may be
necessary or  appropriate  in order to carry out the purposes and intent of this
Agreement.

         18.10 Force  Majeure.  Performance of a party's  obligations  hereunder
(other  than the  payment of money or the  failure  by B&L to provide  insurance
pursuant to Section 13.5) may be delayed if (a) such  performance  is delayed by
causes beyond that party's reasonable  control,  including,  but not limited to,
acts of God, war, riot, epidemics, fire, flood,  insurrection,  or acts of civil
or military  authorities,  and (b) such  delaying  party is at all times working
diligently to correct the matter  causing the delay and otherwise  performing as
required under the Agreement.  Notwithstanding the foregoing,  the parties shall
remain liable for all  obligations  incurred by them prior to any termination of
this Agreement.

         18.11  Counterparts.  This  Agreement  may be  executed  in one or more
counterparts,  all of which shall be considered one and the same agreement.  One
or more  counterparts  may be delivered via telecopier  and any such  telecopied
counterpart  shall  have the same force and  effect as an  original  counterpart
hereto.

         18.12 Exhibits and Schedules.  The following Exhibits and Schedules are
attached hereto and incorporated herein by reference:


                         Exhibits         Subject Matter
                         --------         --------------
                            A             Patents and Patent Applications
                            B             Project Plan
                            C             Initial Members of the JDC
                            D             Form of Patent Assignment

                        Schedules         Subject Matter
                        ---------         -------------- 
                          1.16           Exceptions to the Licensed Patents


                   [Signatures Appear on the Following Page.]


<PAGE>


         IN WITNESS  WHEREOF the parties  have  executed  this  Agreement  as an
instrument under seal as of the date and year first written above.

SYMBOLLON CORPORATION              BAUSCH & LOMB PHARMACEUTICALS, INC.



By:/s/ Paul C. Desjourdy           By: /s/ Thomas Reidhammer
   ---------------------              ----------------------
   Paul C. Desjourdy,                 Thomas Reidhammer,
   Executive Vice President and       President
   Chief Financial Officer



<PAGE>


                                    EXHIBIT A



                         Patent Applications and Patents



[* INDICATES THAT MATERIAL HAS BEEN OMITTED AND CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED THEREFOR.  ALL SUCH OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH
THE COMMISSION PURSUANT TO RULE 24b-2.]


<PAGE>


                                    EXHIBIT B

                                  Project Plan


         [To be developed by the parties]







<PAGE>


                                    EXHIBIT C


                           Initial Members of the JDC



         Symbollon:                        1.  Jack Kessler
                                           2.  Paul C. Desjourdy



         B&L:                              1.  David Jarosz
                                           2.  Harold Schlevin
                                           3.  Ellen Strahlman





<PAGE>


                                    EXHIBIT D

                            Form of Patent Assignment


                                PATENT ASSIGNMENT


         WHEREAS,  Symbollon Corporation located and doing business at 37 Loring
Drive,   Framingham,   Massachusetts  01702,  hereinafter  referred  to  as  the
"assignor",  is the owner of United States  Letters Patent No.  5,639,481  issue
date June 17, 1997 and  entitled  "Method  for the  Therapeutic  Treatment  of a
Mammalien Eye Using an Admixed  Composition  Containing Free Molecular  Iodine";
and

         WHEREAS, Bausch & Lomb Pharmaceuticals, Inc. located and doing business
at 8500 Hidden River Parkway,  Tampa, Florida 33637,  hereinafter referred to as
the "assignee", is desirous of acquiring the entire right, title and interest in
the same;

         NOW THEREFORE,  in consideration of the sum of ten dollars ($10.00) the
receipt  of  which  is  hereby   acknowledged,   and  other  good  and  valuable
consideration  we, the assignor,  by these present do sell,  assign and transfer
unto said  assignee all right,  title and interest in and to said United  States
Letters Patent No.
5,639,481 with the right to sue for past infringement of said patent.

                                       SYMBOLLON CORPORATION


                                       By________________________________
                                         Paul C. Desjourdy, Exec. Vice President

                                       Dated: July ___, 1997


Attest:



- ------------------------
Jack H. Kessler, Secretary

                                              Corporate Seal

<PAGE>



                                  SCHEDULE 1.16

                       Exceptions to the Licensed Patents



         None.


<PAGE>



                             SYMBOLLON CORPORATION

                            STOCK PURCHASE AGREEMENT

         This  Agreement  dated as of  August  4,  1997 is  entered  into by and
between Symbollon  Corporation,  a Delaware  corporation,  residing at 37 Loring
Drive,  Framingham,  Massachusetts  01702  (the  "Company"),  and  Bausch & Lomb
Pharmaceuticals,  Inc., a Delaware corporation ("B&L"),  residing at 8500 Hidden
River Parkway,  Tampa, Florida 33637 (B&L and any subsequent valid and permitted
transferee,  shall hereinafter be collectively  referred to as the "Purchaser").
Certain other terms are defined in Section 9 below.

         A.  The  Company  and  B&L  have  entered  into  a  Collaboration   and
Sale/License   Agreement  of  even  date   herewith  (the   "Collaboration   and
Sale/License Agreement") pursuant to which the Company and B&L have provided for
the development and  commercialization  of products for the treatment of various
ophthalmic conditions;

         B. In connection  with the execution and delivery of the  Collaboration
and Sale/License  Agreement,  the Purchaser desires to purchase, and the Company
desires to sell,  shares of the Company's Class A Common Stock,  $.001 par value
per  share  (the  "Common  Stock")  upon the terms  and  conditions  hereinafter
described.

         In consideration of the mutual promises and covenants  contained in the
Agreement, the parties hereto agree as follows:

         1.       Authorization and Sale of Shares.

                  1.1 Authorization. The Company has, or before the Closings (as
defined in Section 2) will have,  duly  authorized  and taken all such corporate
and other actions within its control as is necessary for the issuance,  sale and
delivery,  pursuant to the terms of this Agreement,  of that number of shares of
the Common Stock that can be  purchased  for a purchase  price of eight  hundred
fifty thousand dollars  ($850,000) as is determined by dividing  $850,000 by the
applicable Market Price relevant thereto as defined in Section 2 below.

                  1.2 Sale of  Shares.  Subject to the terms and  conditions  of
this Agreement,  at the First Closing (as defined in Section 2) the Company will
sell and issue to B&L, and B&L will purchase, for an aggregate purchase price of
$500,000  that number of shares of the Common Stock as is determined by dividing
$500,000  by the Market  Price per share on the First  Closing  Date (the "First
Closing Shares").  Subject to the terms and conditions of this Agreement, at the

<PAGE>

Second Closing (as defined in Section 2) the Company will sell and issue to B&L,
and B&L will purchase,  for an aggregate  purchase price of $350,000 that number
of shares of the Common  Stock as is  determined  by  dividing  $350,000  by the
Market Price per share on the Second Closing Date (the "Second Closing Shares").
The First Closing Shares and the Second Closing Shares are hereinafter  referred
to collectively as the "Shares".

         2. The  Closings.  The  closing of the sale and  purchase  of the First
Closing  Shares  shall take place at the offices of the  Company,  or such other
mutually  agreeable  location as the parties may deem  appropriate,  on the date
hereof  unless  the  parties  shall  otherwise  agree  in  writing  (the  "First
Closing").  The closing of the sale to and purchase of the Second Closing Shares
shall take place at the offices of the Company, or such other mutually agreeable
location as the parties may deem appropriate,  on the date the payment is due by
B&L  to the  Company  pursuant  to  Section  6.2(b)  of  the  Collaboration  and
Sale/License  Agreement,  if and when  such  payment  becomes  due (the  "Second
Closing").

         The First Closing and the Second Closing are sometimes each referred to
hereinafter as a "Closing" and  collectively as the "Closings".  The date of the
First  Closing is  hereinafter  referred to as the "First  Closing Date" and the
date of the Second  Closing is  hereinafter  referred to as the "Second  Closing
Date".

         At each of the Closings,  the Company shall deliver to B&L certificates
for the number of Shares being purchased by B&L,  registered in the name of B&L,
against payment to the Company of the purchase price therefor, by wire transfer.
The  purchase  price per share for the Shares to be  purchased  at the  Closings
shall  be  the  average  of the  closing  price  of the  Common  Stock  for  the
immediately  preceding  five trading  days before the First  Closing Date or the
Second Closing Date, as applicable (the "Market Price").

         3.  Representations  of the Company.  The Company hereby represents and
warrants to B&L as follows:

                  3.1  Organization  and Standing.  The Company is a corporation
duly  organized,  validly  existing and in good  standing  under the laws of the
State of Delaware  and has full  corporate  power and  authority  to conduct its
business as  presently  conducted  and as proposed to be  conducted by it and to
enter  into  and  perform  this  Agreement  and to  carry  out the  transactions
contemplated  hereby.  The  Company is  qualified  to do  business  as a foreign
corporation and is in good standing in each  jurisdiction in which the nature of
the business  transacted  by it or the  character or location of its  properties
requires  such  qualification,  except where the failure to so qualify would not
have a Material Adverse Effect.


<PAGE>

                  3.2  Capitalization.  The  authorized  capital  stock  of  the
Company as of the date hereof consists of 18,750,000 shares of the Common Stock,
1,250,000  shares  of Class B Common  Stock,  $.001 par  value  per  share,  and
5,000,000  shares of  Preferred  Stock,  $.001 par  value  per  share,  of which
2,913,234  shares of the Common Stock and 15,738  shares of Class B Common Stock
are   outstanding  as  of  the  date  hereof  without  taking  into  effect  the
transactions  contemplated by this Agreement.  As of the date of this Agreement,
there are 1,572,080  Class A Warrants  (each of which is exercisable to purchase
one  share of Class A Common  Stock  and one  Class B  Warrant  on the terms and
conditions thereof) and 1,227,920 Class B Warrants (each of which is exercisable
to  purchase  one  share of Class A Common  Stock on the  terms  and  conditions
thereof)  presently  outstanding.  As of the date of this  Agreement,  there are
options  outstanding to purchase  100,000 Units (a Unit consists of one share of
Class A Common Stock, one Class A Warrant and one Class B Warrant),  and 691,222
shares of Class A Common Stock.  All shares  outstanding on the date hereof are,
and any  shares  that will be issued  under  the  terms  and  conditions  of the
warrants and options  referred to above,  when issued in  accordance  with their
terms,   will  be,  duly   authorized,   validly   issued  and  fully  paid  and
nonassessable. There are no preemptive rights, rights of first refusal, or other
similar  rights  available  to the  existing  holders  of Common  Stock or other
securities of the Company.

                  3.3 Issuance of Shares. The issuance, sale and delivery of the
Shares have been, or will be on or prior to the  applicable  Closing Date,  duly
authorized by all  necessary  corporate  action on the part of the Company.  The
Shares,  when issued,  sold and delivered against payment therefor in accordance
with the provisions of this Agreement,  will be duly and validly  issued,  fully
paid and non-assessable and free and clear of any liens or preemptive, rights of
first refusal,  or other similar rights (other than  Applicable  Securities Laws
and the terms of this Agreement).

                  3.4 Authority for  Agreement;  No  Conflicts.  The  execution,
delivery and performance by the Company of this Agreement,  and the consummation
of the  transactions  contemplated  hereby,  have  been duly  authorized  by all
necessary  corporate action. This Agreement has been duly executed and delivered
by the Company,  and is  enforceable  against it in  accordance  with its terms,
except  that  such   enforcement  may  be  subject  to  applicable   bankruptcy,
receivership,   fraudulent  transfer,  moratorium  and  similar  laws  affecting
creditors' rights, and the remedy of specific  performance and injunctive relief
may be subject to  equitable  defenses  and to the  discretion  of the court for
which  proceeding  therefor may be brought.  The  execution and delivery of this
Agreement and performance of the transactions contemplated by this Agreement and
compliance  with its  provisions by the Company will not conflict with or result
in any breach of any of the terms,  conditions or provisions of, or constitute a
default  under,  or  require  a consent  or waiver  under,  its  Certificate  of

<PAGE>

Incorporation  or By-Laws  (each as amended  to date) or any  indenture,  lease,
agreement  or other  instrument  to which the Company is party or by which it or
any of its properties is bound, or violate any decree, judgment, order, statute,
rule, regulation or other provision of law applicable to the Company,  except in
each case as would not result in a Material Adverse Effect.

                  3.5 Governmental  Consents.  No consents,  approval,  order or
authorization  of, or  regulation,  qualification,  designation,  declaration or
filing with, any  governmental  authority is required on the part of the Company
in connection  with the  execution and delivery of this  Agreement or the offer,
issuance,  sale and  delivery  of the  Shares  or the other  transactions  to be
consummated  at any  Closing,  as  contemplated  by this  Agreement,  except for
compliance with the provisions of any laws as to which the failure to be made or
obtained would not result in a Material Adverse Effect and such filings as shall
have  been  made  prior to and shall be  effective  on and as of the  applicable
Closing,  except  that  any  notices  of sale  required  to be  filed  with  the
Securities and Exchange  Commission (the "Commission") under Regulation D of the
Securities Act of 1933, as amended (the "Securities  Act"), or such post-closing
filings as may be required under applicable state securities laws, which will be
timely filed within the applicable periods therefor.

                  3.6 Corporate  Condition.  The Company's condition was, in all
material  respects,  as described in the Disclosure  Documents at the respective
dates thereof,  including  without  limitation the reports filed pursuant to the
Exchange  Act.  There  has been no  material  adverse  change  in the  Company's
business,  financial condition or prospects since March 31, 1997. The Disclosure
Documents  are true and correct as of their  respective  dates,  in all material
respects,  and the financial  statements  contained in the Disclosure  Documents
have been prepared in accordance with generally accepted accounting  principles,
consistently  applied,  and fairly present the financial position and results of
operation  and cash flows of the Company,  for the periods  then ended.  Without
limiting the foregoing as of the date hereof,  there are no material  pending or
threatened litigation or other material liabilities,  contingent or actual, that
are not disclosed in the Disclosure Documents except as incurred in the ordinary
course of business  since March 31,  1997.  This  Agreement  and the  Disclosure
Documents do not contain any untrue statement of a material fact and do not omit
to state any material fact required to be stated therein or herein  necessary to
make statements  contained  therein or herein not misleading in the light of the
circumstances under which they were made.

                  3.7 Current Public Information.  During the three months prior
to the  execution  of this  Agreement,  the Company has filed all the  materials
required to be filed as reports pursuant to the Exchange Act on a timely basis.


<PAGE>

         4.  Representations  of the  Purchaser.  The Purchaser  represents  and
warrants to the Company as follows (such representations and warranties shall be
true and correct on the date hereof and on and as of the Second Closing Date):

                  4.1 Investment.  The Purchaser is acquiring the Shares for its
own account  for  investment  and not with a view to, or for sale in  connection
with, any distribution  thereof,  nor with any present intention of distributing
or selling  the same.  The  Purchaser  is an  "Accredited  Investor"  within the
meaning  of Rule  501(a)(3)  of  Regulation  D under  the  Securities  Act.  The
Purchaser  understands  that  the  Shares  have not been  registered  under  the
Securities  Act  by  reason  of  a  specific  exemption  from  the  registration
provisions  thereof which depends upon, among other things, the bona fide nature
of its investment  intent as expressed  herein.  The Purchaser will not transfer
the Shares except in compliance with Applicable Securities Laws and the terms of
this Agreement.

                  4.2 Power and Authority.  The Purchaser has the full power and
authority to execute, deliver and perform this Agreement.  This Agreement,  when
executed and  delivered by the  Purchaser,  will  constitute a valid and legally
binding obligation of the Purchaser, enforceable in accordance with its terms.

                  4.3  State  of  Jurisdiction.  The  Purchaser  represents  and
warrants  that  all  matters  and  actions   relevant  to  its   considerations,
evaluations  or executions of this  Agreement or the  transactions  contemplated
hereby  by its  including,  without  limitation,  the  receipt  of any  offer to
purchase,  the receipt and review of any documents or other  materials  relevant
hereto,  the participation in any  communications  with the Company or any other
party,  and the consummation of the  transactions  contemplated  hereby occurred
solely in Florida or Massachusetts.

                  4.4 Independent Investigation. The Purchaser has relied solely
upon an independent  investigation made by it and its  representatives  and has,
prior to the date hereof,  been given access to and the  opportunity  to examine
all material  contracts  and  documents of the Company  which have been filed as
exhibits to the Company's filings made under the Securities Act and the Exchange
Act through  publicly  available  means.  The  Purchaser  has been provided with
copies of the  Company's  (i)  Annual  Report on Form  10-KSB for the year ended
December  31,  1996;  (ii)  Annual  Report to  Stockholders  for the year  ended
December  31,  1996,  (iii)  Registration  Statement  on Form S-3 filed with the
Commission on May 21, 1997, (iv) Quarterly Report on Form 10-QSB for the quarter
ended March 31, 1997; (v) Risk Factors, attached hereto as Exhibit 4.4, and (vi)
Proxy Statement dated April 9, 1997 (collectively,  the "Disclosure Documents").
The Purchaser has requested,  received,  reviewed and considered all information
it deems relevant in making a decision to execute this Agreement and to purchase
the  Shares.  In making its  investment  decision to  purchase  the Shares,  the

<PAGE>

Purchaser is not relying on any oral or written  representations  or  assurances
from the Company or any other person or any representation of the Company or any
other  person  other  than as set  forth in this  Agreement,  or the  Disclosure
Documents.

                  4.5 Economic Risk. The Purchaser  understands and acknowledges
that an investment in the Shares  involves a high degree of risk.  The Purchaser
acknowledges  that there are  limitations  on the  liquidity of the Shares.  The
Purchaser  represents that the Purchaser is able to bear the economic risk of an
investment in the Shares,  including a possible  total loss of  investment.  The
Purchaser has such  knowledge and  experience in financial and business  matters
that the  Purchaser  is  capable  of  evaluating  the  merits  and  risks of the
investment in the Shares to be received by the Purchaser; and that the Purchaser
is  sophisticated  accredited  investor with experience with  development  stage
issuers engaged in biotech and pharmaceutical businesses.

                  4.6 No  Conflicts.  The  execution of and  performance  of the
transactions  contemplated  by this Agreement and compliance with its provisions
by the  Purchaser  will not conflict  with or result in any breach of any of the
terms,  conditions or provisions of, or constitute a default under, or require a
consent or waiver under any indenture,  lease,  agreement or other instrument to
which  the  Purchaser  is a party or by which  it or any of its  properties  are
bound, or violate any decree,  judgment,  order,  statute,  rule,  regulation or
other  provision of law  applicable  to the  Purchaser,  which  violation  would
prevent,   impair,   hinder  or  delay  the  consummation  of  the  transactions
contemplated by this Agreement.

                  4.7 Governmental  Consents.  No consents,  approval,  order or
authorization  of, or  regulation,  qualification,  designation,  declaration or
filing with, any governmental authority is required on the part of the Purchaser
in connection  with the execution and delivery of this Agreement or the purchase
of the Shares or the other  transactions  to be consummated  at any Closing,  as
contemplated by this Agreement.

                  4.8  Brokers,  Etc.  The  Purchaser  has dealt with no broker,
finder,  commission  agent or person in connection with the offer or sale of the
Shares and the  transactions  contemplated  by this  Agreement  and  neither the
Purchaser  nor the Company is under any  obligation  to pay any  broker's  fees,
finder's fees, or other fees or commissions in connection with such transactions
as a result of any action by the Purchaser.

         5.  Conditions  to the  Obligations  of the  Purchaser at the Closings.
Notwithstanding anything to the contrary contained herein, the obligation of the
Purchaser  to  purchase  Shares  at  each  of the  Closings  is  subject  to the
fulfillment, or the waiver by the Purchaser, of each of the following conditions
on or before each Closing:


<PAGE>

                  5.1  Accuracy  of   Representations   and   Warranties.   Each
representation  and warranty of the Company  contained in Section 3 hereof shall
be true on and as of each Closing Date in all  material  respects  with the same
effect as though such  representation  and  warranty  had been made on and as of
that date.

                  5.2 Performance. The Company shall have performed and complied
in all material  respects with all agreements  and conditions  contained in this
Agreement  and the  Collaboration  and  Sale/License  Agreement  required  to be
performed or complied with by the Company prior to or at each Closing.

                  5.3 Qualifications. There shall not be in effect any law, rule
or regulation  prohibiting or restricting the sale and issuance of the Shares or
requiring  any consent or approval of any person or  governmental  entity  which
shall  not have  been  obtained  prior to the  issuance  of the  Shares  in such
Closing.

                  5.4 Collaboration and Sale/License Agreement.  The Company and
the  Purchaser  shall  have  executed  and  delivered  the   Collaboration   and
Sale/License Agreement,  and that as of each Closing Date, the Collaboration and
Sale/License Agreement shall be a validly existing agreement.

                  5.5  Proceedings   and  Documents.   All  corporate  or  other
proceedings in connection with the transactions contemplated at such Closing and
all documents  incident  thereto shall be  reasonably  satisfactory  in form and
substance to the Purchaser and its counsel and the Purchaser shall have received
all such counterpart original and certified or other copies of such documents as
it may reasonably request.

                  5.6 Issuance of Shares. The Company shall have taken all steps
necessary  to  instruct  its  transfer  agent  to issue a share  certificate  or
certificates representing the Shares issued in such Closing.

                  5.7  Compliance  Certificate.  An  authorized  officer  of the
Company shall have delivered to the Purchaser a certificate  certifying that the
conditions  specified  in Sections  5.1,  5.2, and 5.3 have been  fulfilled  and
stating that there shall have been no adverse  change in the business,  affairs,
properties, assets or conditions of the Company since the Effective Date, except
as otherwise disclosed in any report or other document filed by the Company with
the Commission under the Securities Act or the Exchange Act from the date hereof
through the applicable Closing Date.

         6.  Conditions  to  the  Obligations  of the  Company.  Notwithstanding
anything to the contrary  contained  herein,  the  obligations of the Company to

<PAGE>

issue,  sell and deliver at each Closing the Shares are subject to  fulfillment,
on or before each Closing Date, of each of the following conditions:

                  6.1  Accuracy  of   Representations   and   Warranties.   Each
representation and warranty of the Purchaser contained in Section 4 hereof shall
be true on and as of each Closing Date in all  material  respects  with the same
effect as though such  representation  and  warranty  had been made on and as of
that date.

                  6.2  Performance.  The  Purchaser  shall  have  performed  and
complied in all material  respects with all agreements and conditions  contained
in this Agreement and the Collaboration and Sale/License  Agreement  required to
be performed or complied with by the Purchaser prior to or at each Closing.

                  6.3 Qualifications. There shall not be in effect any law, rule
or regulation  prohibiting or restricting the sale and issuance of the Shares or
requiring  any consent or approval of any person or  governmental  entity  which
shall  not have  been  obtained  prior to the  issuance  of the  Shares  in such
Closing.

                  6.4 Collaboration and Sale/License Agreement.  The Company and
the  Purchaser  shall  have  executed  and  delivered  the   Collaboration   and
Sale/License Agreement,  and that as of each Closing Date, the Collaboration and
Sale/License Agreement shall be a validly existing agreement.


                  6.5 Required  Payment.  The Purchaser  shall have delivered in
accordance with this Agreement and the Collaboration and Sale/License  Agreement
the purchase price of $500,000 (with respect to the First Closing), the purchase
price of  $350,000  (with  respect to the Second  Closing),  and all  amounts as
required to be paid by the Purchaser  pursuant to the terms of the Collaboration
and Sale/License Agreement.

                  6.6  Compliance  Certificate.  An  authorized  officer  of the
Purchaser shall have delivered to the Company a certificate  certifying that the
conditions specified in Sections 6.1, 6.2, and 6.3 have been fulfilled.

         7.       Transfer Restrictions and Registration.

                  7.1  Legend.  Unless  and  until  otherwise  permitted,   each
certificate representing the Shares shall be stamped or otherwise imprinted with
a legend in substantially the following form:

         "THE SHARES  EVIDENCED  BY THIS  CERTIFICATE  HAVE NOT BEEN  REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR ANY STATE  SECURITIES  LAW. NO
TRANSFER,  SALE OR  OTHER  DISPOSITION  OF  THESE  SHARES  MAY BE MADE  UNLESS A

<PAGE>

REGISTRATION  STATEMENT WITH RESPECT TO THESE SHARES HAS BECOME  EFFECTIVE UNDER
SAID ACT,  OR  SYMBOLLON  CORPORATION  IS  FURNISHED  WITH AN OPINION OF COUNSEL
SATISFACTORY  IN  FORM  AND  SUBSTANCE  TO IT  THAT  SUCH  REGISTRATION  IS  NOT
REQUIRED."

         `THE SHARES ARE SUBJECT TO CERTAIN RESTRICTIONS ON THEIR TRANSFER, SALE
OR OTHER DISPOSITION AND ARE SUBJECT TO CERTAIN REDEMPTION PROVISIONS PURSUANT 
TO A STOCK PURCHASE AGREEMENT DATED AUGUST 4, 1997.  A COPY OF WHICH IS 
AVAILABLE UPON WRITTEN REQUEST OF SYMBOLLON CORPORATION WITHOUT CHARGE."

and any legend required by any applicable state securities laws.

                  7.2 Required Registration. The Purchaser shall have the right,
exercisable upon written notice to the Company, to request the Company to file a
registration statement on the Form S-3 (or other applicable form, as the Company
determines  appropriate)  covering the Base Shares purchased hereunder after the
fourth  anniversary  of the date of this  Agreement.  Upon  receipt  of any such
notice,  the Company  shall,  as  expeditiously  as possible,  use  commercially
reasonable efforts to effect such registration, obtain any governmental approval
and  effect  listing  with any  securities  exchange  on which  the stock of the
Company is then listed, which may be required to permit the Purchaser to dispose
of the Shares.  The Company  shall use its  commercially  reasonable  efforts to
maintain the  effectiveness  of the  registration  statement  until the first to
occur of (i) the completion of the  distribution of the Shares covered  thereby,
(ii) such time as the Shares  covered  thereby may be sold  without  restrictive
legend under Rule 144 or other exemption from the registration  requirements of 
the Securities Act, or (iii) 90 days from the effective date of the registration
statement. The Company agrees to keep the  registration  statement  current  
during  such  period.  The Company's  obligation  shall be limited to one  
registration  covering  the Base Shares.

         The Purchaser shall have the right,  exercisable upon written notice to
the Company, to request the Company to file a registration statement on the Form
S-3 (or other applicable form, as the Company determines  appropriate)  covering
the Additional Shares purchased  hereunder after the seventh  anniversary of the
date of this Agreement.  Upon receipt of any such notice,  the Company shall, as
expeditiously as possible,  use commercially  reasonable  efforts to effect such
registration,  obtain any  governmental  approval  and effect  listing  with any
securities exchange on which the stock of the Company is then listed,  which may
be required to permit the Purchaser to dispose of the Shares.  The Company shall
use its  commercially  reasonable  efforts to maintain the  effectiveness of the
registration  statement  until the first to occur of (i) the  completion  of the
distribution of the Shares covered thereby, (ii) such time as the Shares covered

<PAGE>

thereby may be sold without restrictive legend under Rule 144 or other exemption
from the registration  requirements of the Securities Act, or (iii) 90 days from
the effective date of the registration statement. The Company agrees to keep the
registration  statement  current  during such period.  The Company's  obligation
shall be limited to one registration covering the Additional Shares.

         Notwithstanding anything contained in this Section 7.2 to the contrary,
the Company shall not be obligated to effect a registration  covering the Shares
if at the time of  request,  all such  Shares can be  immediately  sold  without
restrictive  legend  under  Rule 144 or other  exemption  from the  registration
requirements of the Securities Act. The Company shall not be required to cause a
registration statement to become effective pursuant to this Section 7.2 prior to
120 days  following the effective  date of the most recent  registration  by the
Company under the Securities Act.

                  7.3 Piggy-Back  Registration  Rights.  With regard to the Base
Shares and the  Additional  Shares,  if the Company at any time after the fourth
and the  seventh  anniversary,  respectively,  proposes  to  register  under the
Securities  Act any of its  Common  Stock on any form on which the Shares may be
included,  except shares to be issued in connection  with any acquisition of any
entity or business, shares issuable upon the exercise of stock options or shares
issuable pursuant to employee benefit plans, it will each such time give written
notice to the Purchaser of its  intention to do so. If the Purchaser  desires to
have any of its Shares purchased  hereunder  included in such  registration,  it
shall,  within 20 days after it receipt of such notice from the Company,  notify
the Company of the number of shares which it desires to have so included and the
manner in which it proposes to dispose of such  Shares.  The Company  will cause
all such Shares  requested to be registered by the Purchaser to be registered or
qualified  to the  extent  requisite  to  permit  the sale or other  disposition
thereof in the manner described by the Purchaser; provided, however, that if, in
connection  with the offering of Common Stock pursuant to a  registration  under
the Securities Act, such offering  includes shares of Common Stock being sold by
the Company and the managing underwriter shall impose a limitation on the number
of shares of the Common  Stock which may be  included  in any such  registration
statement  because,  in its judgment,  such limitation is necessary to effect an
orderly public distribution and such limitation is imposed pro rata with respect
to all securities which have an incidental or "piggy back" rights to be included
in the registration statement, then the Company shall be obligated to include in
such registration statement only such limited portion of the Shares which it has
been requested hereunder to include.

         In connection with any such offering,  the Purchaser shall execute such
agreements as the  underwriters  shall  reasonably  request,  including  without
limitation  "lock-up"  agreements.  Notwithstanding  anything  contained in this

<PAGE>

Section  7.3 to the  contrary,  the  Company  shall not be required to offer the
Purchaser the right to participate in more than two offerings.

                  7.4 Non-public  Information.  Notwithstanding  anything to the
contrary in this  Section 7, the  Company  shall have the right (i) to defer the
initial filing or request for  acceleration of effectiveness of any registration
or (ii) after effectiveness,  to suspend  effectiveness of any such registration
statement,  if, in the good  faith  judgment  of the board of  directors  of the
Company,  such delay in filing or requesting  acceleration of  effectiveness  or
such  suspension  of  effectiveness  is necessary  in light of the  existence of
material non-public  information (financial or otherwise) concerning the Company
disclosure of which at the time is not, in the opinion of the board of directors
of the Company,  (A)  otherwise  required  and (B) in the best  interests of the
Company;  provided however that the Company will use its commercially reasonable
efforts to terminate such delay or suspension as soon as practicable.

                  7.5 Payment of  Expenses.  The Company  shall bear the expense
(excluding underwriting  commissions,  dealers' fees, brokers' fees, concessions
applicable  to the  Shares,  legal fees and  expenses of the  Purchaser  and any
out-of-pocket  expenses of the Purchaser) of all registrations  pursuant to this
Section 7.

                  7.6  Indemnification.  The Company  hereby agrees to indemnify
and hold harmless the Purchaser and any underwriter against all losses,  claims,
damages,  liabilities  and expenses  (under the Applicable  Securities  Laws, or
common law or  otherwise)  caused by any  untrue  statement  or  alleged  untrue
statement  of a  material  fact  contained  in  any  registration  statement  or
prospectus  (and as amended or  supplemented if the Company shall have furnished
any  amendments or  supplements  thereto) or any  preliminary  prospectus or any
other  document  prepared  and/or  furnished to the  Purchaser  incident to such
registration  statements  or  prospectus,  or caused by any  omission or alleged
omission  to state  therein a material  fact  required  to be stated  therein or
necessary  to make the  statements  therein  complete or not  misleading  except
insofar as such losses, claims,  damages,  liabilities or expenses are caused by
any untrue statement or omission  contained in information  furnished in writing
to the Company by the Purchaser  expressly for use therein.  In connection  with
any  registration  statement in which the Purchaser is  participating,  and as a
condition to the  obligation of the Company to cause any Shares of the Purchaser
to be  included in a  registration  statement  pursuant  to this  Section 7, the
Purchaser  will  furnish to the  Company in writing  such  information  as shall
reasonably  be  requested  by the  Company  for  use in  any  such  registration
statement or  prospectus  and will  indemnify,  severally  and not jointly,  the
Company,  its  directors  and  officers,  each person,  if any, who controls the
Company within the meaning of the Applicable  Securities Laws, such underwriters
and each  person  who  controls  such  underwriters  within  the  meaning of the

<PAGE>

Applicable Securities Laws, against any losses, claims, damages, liabilities and
expenses  resulting from any untrue  statement or alleged untrue  statement of a
material fact or any omission or alleged omission of a material fact required to
be stated in the registration  statement or prospectus and necessary to make the
statements therein complete or not misleading,  but only to the extent that such
untrue statement or omission is contained in information so furnished in writing
by the Purchaser expressly for use therein.

         Promptly  after receipt by any person  entitled to indemnity  hereunder
(the "Indemnified Party") of notice of the commencement of any action in respect
of  which   indemnity  may  be  sought  against  another  party  hereunder  (the
"Indemnifying  Party") such Indemnified Party will notify the Indemnifying Party
in  writing  of  the  commencement  thereof,  and,  subject  to  the  provisions
hereinafter  stated,  the  Indemnifying  Party shall  assume the defense of such
action  (including  the employment of counsel,  who shall be counsel  reasonably
satisfactory to such Indemnified Party), and the payment of expenses as incurred
insofar as such action shall relate to any alleged liability in respect of which
indemnity may be sought against the Indemnifying  Party.  Such Indemnified Party
shall  have the right to  employ  separate  counsel  in any such  action  and to
participate  in the defense  thereof but the fees and  expenses of such  counsel
shall not be at the expense of the Indemnifying  Party unless (i) the employment
of such counsel has been  specifically  authorized by the Indemnifying  Party or
(ii) the  Indemnifying  Party  shall have  failed to assume the  defense of such
action or proceeding.  The  Indemnifying  Party shall not be liable to indemnify
any  person  for  any  settlement  of  any  such  action  effected  without  the
Indemnifying Party's consent,  which consent shall not be unreasonably  withheld
or delayed.

         If the indemnification  provided for in this Section is held by a court
of  competent  jurisdiction  to be  unavailable  to the  Indemnified  Party with
respect to any loss,  liability,  claim,  damage or expense  referred to herein,
then the  Indemnifying  Party, in lieu of indemnifying  such  Indemnified  Party
hereunder,  shall  contribute to the amount paid or payable by such  Indemnified
Party as a result of such  loss,  liability,  claim,  damage or  expense in such
proportion as is appropriate  to reflect the relative fault of the  Indemnifying
Party  on the  one  hand  and of the  Indemnified  Party  on the  other  hand in
connection  with the  statements  or  omissions  which  resulted  in such  loss,
liability,  claim,  damage or  expense as well as any other  relevant  equitable
considerations. The relevant fault of the Indemnifying Party and the Indemnified
Party shall be  determined  by  reference  to, among other  things,  whether the
untrue or alleged untrue statement of a material fact or the omission to state a
material fact relates to information  supplied by the  Indemnifying  Party or by
the Indemnified  Party and the parties'  relative intent,  knowledge,  access to
information and opportunity to correct or prevent such statement or omission.


<PAGE>

                  7.7 Exchange Act Registration Requirements.  The Company shall
use its  commercially  reasonable  efforts to remain  subject  to the  reporting
requirements  of either  Section 13 or Section  15(d) of the  Exchange  Act. The
Company shall file with the  Commission in a timely manner such  information  as
the  Commission  may require under either of said  Sections,  and shall take all
reasonable  action as may be  required  to be taken  under the  Exchange  Act to
permit  sales of the Shares  pursuant to Rule 144 (or any  similar or  successor
exemptive rule hereafter in effect) and the use of Form S-3 (or any similar form
which hereafter may be promulgated under the Securities Act) for registration of
the Shares.

                  7.8 Notice.  The Company shall provide notice to the Purchaser
of any "stop order" or other notice affecting the Purchaser's  right to sell the
Shares under any effective registration statement.

         8. Covenants of the Purchaser.

                  8.1 Transfer Restrictions. On or before the fourth anniversary
of this Agreement, B&L shall not, directly or indirectly, transfer, sell, assign
or otherwise  encumber the Base Shares except as noted below.  Starting with the
payment due pursuant to Section  6.2(c) of the  Collaboration  and  Sale/License
Agreement,  and for each payment due on or before the fourth anniversary of this
Agreement,  B&L shall have the right to offset a portion of the payment then due
with up to 50% of the Base Shares;  provided,  that for the payment due pursuant
to Section 6.2(e) of the  Collaboration  and Sale/License  Agreement such offset
may be up to 100% of the Base  Shares.  The Base Shares shall be valued at their
original Market Price per share. At any time on or before the fourth anniversary
of this  Agreement,  Symbollon shall have a right to purchase some or all of the
Base Shares from B&L at their original Market Price per share.

         On or before the seventh anniversary of this Agreement,  B&L shall not,
directly  or  indirectly,  transfer,  sell,  assign or  otherwise  encumber  the
Additional Shares except as noted below.  Starting with the payment due pursuant
to Section 6.2(e) of the Collaboration and Sale/License Agreement,  and for each
payment due on or before the seventh  anniversary of this  Agreement,  B&L shall
have  the  right to  offset a  portion  of the  payment  then due with up to one
hundred seventy thousand dollars ($170,000) of the Additional Shares;  provided,
that for the payment due  pursuant to Section  6.2(g) of the  Collaboration  and
Sale/License  Agreement such offset may be up to 100% of the Additional  Shares;
and provided, further, that for any payment (except for the payment due pursuant
to Section 6.2(g) of the Collaboration and Sale/License  Agreement) that B&L has
a right to offset a portion of such payment with both Base Shares and Additional
Shares,  B&L shall  only be  allowed to offset  such  payment  with an amount of
Additional  Shares  such that the offset  does not exceed  one  hundred  seventy
thousand  ($170,000)  of the Shares.  The  Additional  Shares shall be valued at
their  original  Market  Price per share.  At any time on or before the  seventh

<PAGE>

anniversary of this Agreement,  Symbollon shall have a right to purchase some or
all of the Additional Shares from B&L at their original Market Price per share.

         For  purposes  of B&L's  right to offset  payments  with the Shares and
Symbollon's  right to  purchase  the  Shares,  the  Shares  shall be offset  and
purchased,  as the case may be, in the order in which the Shares were originally
purchased from Symbollon. The Base Shares shall be deemed to have been purchased
prior to the Additional Shares.

                  8.2 Voting  Agreement.  The Purchaser  agrees that it, and its
affiliates,  shall vote any shares of the Common Stock, including the Shares, in
such manner as the  Company's  Board of Directors  shall  recommend  and, in the
absence of any such recommendation, the same proportion as the other outstanding
voting shares of Symbollon are voted on any matter submitted to the shareholders
for  consideration;  provided,  however,  that the foregoing voting  requirement
shall not apply to the Purchaser in any transaction which is not approved by the
Company's Board of Directors or in the event of a proposed merger or combination
or sale of substantially all of the assets of the Company to a competitor of the
Purchaser.

                  8.3  Forfeiture.   If  the   Collaboration   and  Sale/License
Agreement is terminated before the payments required pursuant to Sections 6.2(a)
through (g) of the  Collaboration  and  Sale/License  Agreement  are made by the
Purchaser,  then the Purchaser shall transfer the Additional  Shares held by the
Purchaser to Symbollon for no consideration.

                  8.4  Standstill.  Except for the Shares,  prior to the seventh
anniversary of this Agreement,  B&L, and its  affiliates,  shall not acquire any
securities of the Company without the Company's consent.

                  8.4 Redemption  Rights.  If the Collaboration and Sale/License
Agreement is  terminated  by B&L pursuant to Sections 16.2 or 16.3 thereof prior
to the fourth  anniversary of this Agreement,  then after the completion of each
calendar year  thereafter  which ends prior to the seventh  anniversary  of this
Agreement,  B&L shall have the right to require the Company to purchase at their
original Market Price per share that number of the Base Shares then  outstanding
equal to  twenty-five  percent (25%) of the  Company's  positive cash flows from
operating   activities,   as  determined  under  generally  accepted  accounting
principles,  for that  calendar  year.  B&L may  exercise  its right to  require
redemption  in  accordance  with this Section 8.4 for a given  calendar  year by
sending  written  notice to the  Company  within 30 days of its  receipt  of the
Company's audited financial statements for such year.

         9. Definitions.  When used in this Agreement, the following terms shall
have the meanings indicated.


<PAGE>

                  "Additional  Shares"  mean the  remaining  one  hundred  fifty
thousand  dollars  ($150,000) of the Shares  purchased by the Purchaser from the
Company on the First Closing Date after  subtracting  the Base Shares,  together
with the  Shares  purchased  by the  Purchaser  from the  Company  on the Second
Closing, if and when purchased.

                  "Applicable Securities Laws" means the applicable Federal and 
state securities laws.

                  "Base  Shares"  mean  three  hundred  fifty  thousand  dollars
($350,000)  of the Shares  purchased  by the  Purchaser  from the Company on the
First Closing Date.

                  "Class A Common  Stock"  means  the  Company's  Class A Common
Stock, $.001 par value per share.

                  "Class B Common  Stock"  means  the  Company's  Class B Common
Stock, $.001 par value per share.

                  "Closing" shall have the meaning specified in Section 2.

                  "Collaboration and Sale/License Agreement" shall have the 
meaning specified on the first page hereof.

                  "Commission" means the Securities and Exchange Commission.

                  "Common Stock" means the Class A Common Stock.

                  "Company" means Symbollon Corporation, a Delaware corporation.

                  "Disclosure Documents" shall have the meaning specified in 
Section 4.4.

                  "Exchange Act" means the Securities Exchange Act of 1934, as 
amended.

                  "First Closing" shall have the meaning specified in Section 2.

                  "First Closing Date" shall have the meaning specified in 
Section 2.

                  "First Closing Shares" shall have the meaning specified in 
Section 1.2.


<PAGE>

                  "Indemnified Party" shall have the meaning specified in 
Section 7.6.

                  "Indemnifying Party" shall have the meaning specified in 
Section 7.6.

                  "Market Price" shall have the meaning specified in Section 2.

                  "Material  Adverse Effect" means a material  adverse effect on
the business,  prospects,  condition (financial or otherwise), assets or results
of operations of the Company taken as a whole.

                  "Purchaser" means Bausch & Lomb Pharmaceuticals, Inc., and any
subsequent valid transferee.

                  "Second Closing" shall have the meaning specified in 
Section 2.

                  "Second Closing Date" shall have the meaning specified in 
Section 2.

                  "Second Closing Shares" shall have the meaning specified in 
Section 1.2.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Shares" shall have the meaning specified in Section 1.2.

                  "Units" means  securities of the Company each of which consist
of one  share of Class A Common  Stock,  one  Class A  Warrant  and one  Class B
Warrant.

         10. Notices. All notices, requests,  consents, and other communications
under this  Agreement  shall be in writing and shall be delivered in person with
receipt  acknowledged  or mailed by first class  certified or  registered  mail,
return  receipt  requested,  postage  prepaid,  by reputable  overnight  mail or
courier,  with  receipt  confirmed,  or by telecopy  and  confirmed  by telecopy
answerback, addressed as follows:

         If to the Company:

                           Symbollon Corporation
                           37 Loring Drive
                           Framingham, Massachusetts 01702
                           Telephone: (508) 620-7676
                           Telecopy: (508) 620-7111
                           Attn: President


<PAGE>

          With a copy to:

                           William P. Gelnaw, Jr., Esq.
                           Choate, Hall & Stewart
                           Exchange Place
                           53 State Street
                           Boston, MA  02109
                           Telephone:  (617)-248-5000
                           Fax:  (617)-248-4000

          To B&L:

                           Bausch & Lomb Pharmaceuticals, Inc.
                           8500 Hidden River Parkway
                           Tampa, FL  33637
                           Telephone:  (800) 227-1427
                           Fax:  (813) 975-7774
                           Attention:  President


          With copy to:

                           Bausch & Lomb, Incorporated
                           One Bausch & Lomb Place
                           Rochester, N.Y.  14604-2701
                           Telephone:  (716) 338-8600
                           Fax:  (716) 338-8017
                           Attention:  General Counsel

or at such other  address or addresses as may have been  furnished in writing by
any party to the other in  accordance  with the  provisions  of this Section 10.
Notices and other  communications  provided in  accordance  with this Section 10
shall be deemed delivered upon receipt.

         11. Entire  Agreement.  This Agreement,  together with the Exhibits and
documents  incorporated by reference  herein,  embodies the entire agreement and
understanding  between the parties  hereto  with  respect to the subject  matter
hereof and supersedes all prior agreements and  understandings  relating to such
subject matter.

         12. Amendments and Waivers.  Except as otherwise expressly set forth in
this Agreement,  any term of this Agreement may be amended and the observance of
any term of this  Agreement may be waived  (either  generally or in a particular
instance  and either  retroactively  or  prospectively),  only with the  written

<PAGE>

consent of the Company and the  Purchaser.  Any amendment or waiver  effected in
accordance  with this Section 12 shall be binding upon each party. No waivers of
or exceptions to any terms, condition or provision of this Agreement, in any one
or more  instances,  shall be  deemed  to be,  or  construed  as, a  further  or
continuing waiver of any such term, condition or provision.

         13.  Counterparts.  This  Agreement  may be  executed  in  one or  more
counterparts,  each of which shall be deemed to be an original, but all of which
shall be one and the same document.

         14. Section  Headings.  The section headings are for the convenience of
the  parties  and in no  way  alter,  modify,  amend,  limit,  or  restrict  the
contractual obligations of the parties.

         15.  Severability.  The invalidity or unenforceability of any provision
of this Agreement shall not affect the validity or  enforceability  of any other
provision of this Agreement.

         16. Governing Law. This Agreement shall be governed by and construed in
accordance with the law of The Commonwealth of Massachusetts.

         17.  Successors and Assigns.  This Agreement  shall be binding upon the
parties  hereto and their  respective  successors and assigns and shall inure to
the  benefit  of the  parties  hereto,  provided  that B&L  (and any  subsequent
permitted  Purchaser)  may not  assign its rights  hereunder  without  the prior
written consent of the Company.

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


SYMBOLLON CORPORATION              BAUSCH & LOMB PHARMACEUTICALS, INC.



By: /s/ Paul C. Desjourdy          By: /s/ Thomas Reidhammer
   ----------------------             ----------------------
   Paul C. Desjourdy,                 Thomas Reidhammer.
   Executive Vice President and       President
   Chief Financial Officer


<PAGE>



          
                                   EXHIBIT 4.4

                                  RISK FACTORS

         An investment in the securities  offered hereby  involves a high degree
of risk. Prior to making an investment,  the Purchaser should carefully consider
the following factors,  as well as others described  elsewhere in the Disclosure
Documents,  relating to the business of the Company and the  securities  offered
hereby.

         Development  Stage  Company;  Early  Stage of Product  Development;  No
Assurance of Successful Product  Development.  The Company is in the development
stage and has not conducted any  significant  operations to date or received any
operating  revenues,  except for revenues from the sale of the Company's  bovine
teat  sanitizer,  marketed under the name  IodoZyme(R),  which the Company began
shipping  in early 1995,  and  license  fees and  contract  revenues.  Potential
investors  should be aware of the problems,  delays,  expenses and  difficulties
encountered  by an  enterprise in the Company's  stage of  development,  many of
which may be beyond the Company's  control.  These include,  but are not limited
to, unanticipated problems relating to product development,  testing, regulatory
compliance,  manufacturing  costs,  production,  the  competitive and regulatory
environment  in which the  Company  plans to  operate,  marketing  problems  and
additional costs and expenses that may exceed current estimates.  Products under
development by the Company will require  additional  development  and investment
prior to obtaining regulatory approvals and  commercialization.  There can be no
assurance that such products will be  successfully  developed,  meet  applicable
regulatory  standards,  be capable of  production  in  commercial  quantities at
reasonable costs or be successfully marketed.

         Risks Associated With  Uncertainties  Of Clinical  Trials.  Most of the
Company's proposed therapeutic products are required to obtain approval from the
United  States Food and Drug  Administration  ("FDA")  prior to  marketing  such
products in the United States and the approval of foreign regulatory authorities
to  commercialize  such  proposed  products in other  countries.  To obtain such
approvals,  the  Company is  required  to prove the safety and  efficacy  of its
proposed products through extensive preclinical studies and clinical trials. The
Company's  proposed  therapeutic  products are in various stages of pre-clinical
development.  The completion of clinical  trials  regarding any of such proposed
products is dependent upon many factors including the rate of patient enrollment
and the  heterogeneity of the patients and indications to be treated.  Delays in
patient enrollment,  as well as the heterogeneity of patients and indications to
be treated,  may result in increased trial costs and delays in FDA  submissions,
which could have a material adverse effect on the Company.


<PAGE>

         A  number  of  companies  in  the  biotechnology   and   pharmaceutical
industries have suffered  significant  setbacks in clinical  trials,  even after
showing promising results in earlier studies or trials. Therefore, any favorable
results the Company may obtain in the future in preclinical studies and clinical
trials of its  proposed  products  may not be  predictive  of results  that will
ultimately be obtained in or throughout  such  preclinical  studies and clinical
trials.  There can be no assurance that the Company will not encounter  problems
in its  clinical  trials  that will cause the  Company  to delay or suspend  its
development  efforts and any proposed clinical trials for its proposed products,
that any  clinical  trial  will be  completed  at all,  that such  testing  will
ultimately  demonstrate the safety or efficacy of such proposed products or that
any proposed products will receive regulatory  approval on a timely basis, if at
all. If any such problems  occur,  the Company could be materially and adversely
affected.

         No Assurance Of Regulatory  Approvals;  Potential Delays. The Company's
proposed  products  will be  subject  to  regulation  by the FDA and  comparable
agencies in foreign  countries.  The regulatory  approval  process often takes a
number of years and requires the expenditure of substantial funds. In the United
States,  the FDA enforces,  where applicable,  development,  testing,  labeling,
manufacturing,  registration,  notification,  clearance or approval,  marketing,
distribution,  recordkeeping and reporting  requirements for new drugs,  medical
devices,  biologics and cosmetics.  In addition,  there can be no assurance that
government   regulations   applicable   to  the   Company's   products   or  the
interpretation  of those  regulations  will not change and  thereby  prevent the
Company from marketing some or all of its products  temporarily or  permanently.
There can be no assurance  that any proposed  products  that may be developed by
the Company will be able to satisfy the current  requirements and regulations of
the FDA or  comparable  foreign  agencies.  There can be no  assurance  that the
Company's  proposed  products  will ever  obtain  the  regulatory  clearance  or
approval required for marketing.  Therapeutic products currently being developed
utilizing  the  Company's  iodine  technologies  will likely be regulated as new
drugs products,  each of which faces a substantially more burdensome  regulatory
approval process than that applicable to most medical devices.

         Whether or not FDA  approval has been  obtained,  approval of a drug by
comparable  regulatory  authorities in other countries must be obtained prior to
marketing the product in those countries. The approval process varies by country
and the time  required  may be longer or  shorter  than  that  required  for FDA
approval. Approval of a drug for sale in one country does not ensure approval in
other countries.  The results of Phase I or Phase II studies are not necessarily
indicative of the efficacy or safety of a drug  candidate for human  therapeutic
use.  There can be no assurance that clinical  testing will provide  evidence of
safety and efficacy in humans or that  regulatory  approvals will be granted for
any of  the  Company's  products.  Manufacturers  of  therapeutic  products  are
required to obtain FDA approval of their manufacturing facilities and processes,

<PAGE>

to adhere to applicable  standards for manufacturing  practices and to engage in
extensive recordkeeping and reporting. Failures to obtain or delays in obtaining
regulatory  approvals would adversely affect the  manufacturing and marketing of
the  Company's  products,  the  Company's  financial  position and the Company's
revenues or  royalties.  When and if  approvals  are granted,  the Company,  the
approved  drug,  the  manufacture  of such drug and the facilities in which such
drug is  manufactured  are  subject to  ongoing  regulatory  review.  Subsequent
discovery  of  previously  unknown  problems  may  result  in  restriction  on a
product's use or withdrawal of the product from the market.  Adverse  government
regulation that might arise from future  legislative or  administrative  action,
particularly as it relates to healthcare  reform and product pricing,  cannot be
predicted.

         Teat sanitizers,  although  considered  animal drugs by the FDA, do not
currently require clearance by the FDA prior to marketing. The FDA, however, has
recently issued draft voluntary  guidelines governing teat dips and no assurance
can be made  that  clearance  by the FDA will  not be  required  in the  future.
Required  compliance  with  these  guidelines  or other  FDA  requirements,  the
probability of which cannot currently be ascertained by the Company,  would have
a significant adverse effect on the marketing of IodoZyme and, consequently,  on
the Company's results of operations. The Federal Environmental Protection Agency
("EPA")  has  regulations  covering  many  of the  same  areas  for  many of the
Company's  products  and  proposed  products.  In  addition,  the United  States
Department  of  Agriculture  ("USDA")  may  regulate,  on either a voluntary  or
mandatory  basis,  products which the Company may develop for sanitizing food or
food  contact  surfaces.  Comparable  state and local  agencies may have similar
regulations.

         Uncertain Market Acceptance of Proposed Products.  The Company's future
growth and  profitability  will depend,  in large part, on the acceptance by the
medical community of the Company's  proposed  products.  This acceptance will be
substantially  dependent  on  educating  the  medical  community  as to the full
capabilities,  distinctive  characteristics,  perceived  benefits  and  clinical
efficacy of the Company's proposed products.  There can be no assurance that the
Company's  efforts or those of others on its behalf will be  successful  or that
any of the  Company's  proposed  products  will  receive  the  necessary  market
acceptance. Failure of the Company's proposed products to gain market acceptance
would have a material adverse effect on the Company.

         Risk  Of  Not   Obtaining   Manufacturing   Facility  And   Experienced
Manufacturing  Personnel And/Or  Establishing  Manufacturing  Arrangements  With
Others.  The  Company  intends  to  seek  out  contracts  to  obtain  sufficient
manufacturing  capabilities to allow for production of its proposed  therapeutic
products in quantities  sufficient to support its anticipated clinical needs. To
be  successful,  however,  the  Company  must be  capable  of  manufacturing  or

<PAGE>

contracting  for the  manufacture of its products in commercial  quantities,  in
compliance  with  regulatory  requirements  and at acceptable  costs.  While the
Company has  manufacturing  experience  regarding  IodoZyme,  the Company has no
experience in large scale commercial  manufacturing of therapeutic products. The
Company  intends to enter  into  contractual  arrangements  to  manufacture  its
proposed  products at such time, if ever,  that such  products are  successfully
developed. There can be no assurance that the Company will be able to enter into
any such  arrangements on acceptable  terms, or at all, or that any manufacturer
will be able to meet  any  demand  for such  products  on a  timely  basis.  The
Company's dependence on third parties for manufacturing may adversely affect the
Company's  ability to develop and deliver  products on a timely and  competitive
basis. The Company may manufacture its proposed  products directly at such time,
if ever,  that such  products  are  successfully  developed.  The Company has no
experience  with  the  direct  manufacture  of  these  proposed  products.   The
manufacture  of these  proposed  products  is complex  and  difficult,  and will
require the Company to attract and retain  experienced  manufacturing  personnel
and to obtain the use of a  manufacturing  facility in  compliance  with FDA and
other  regulatory  requirements.  There  can be no  assurance  that  experienced
personnel  can be attracted  to or retained by the Company,  or that the Company
will be able to obtain the financing  necessary to  manufacture  these  products
directly.  In the event the Company  continues  to perform its current  IodoZyme
manufacturing activities in-house,  additional manufacturing space and equipment
may be necessary beyond 1997 as product volume increases.

         Dependence  Upon Third  Parties For Clinicals  Development  Of Proposed
Products.  The Company has entered  into  strategic  alliances  for the clinical
development of certain of its proposed products.  There can be no assurance that
the Company will be successful in retaining the existing agreements,  or be able
to obtain satisfactory new agreements with strategic partners in other areas. In
addition,  there can be no assurance  that the interests and  motivations of any
strategic  partner  would be or remain  consistent  with those of the Company or
that such partner would successfully perform its obligations.

         Accumulated Deficit;  Expectation of Future Losses; Need for Additional
Financing.  At March  31,  1997,  the  Company  had an  accumulated  deficit  of
$5,546,130, which deficiency has increased to date. The Company will be required
to conduct  significant  research,  development  and testing  activities  which,
together with manufacturing,  and other general and administrative expenses, are
expected to result in operating losses for the foreseeable future.  There can be
no  assurance  that the Company will ever have  significant  revenues or achieve
profitable  operations.  At March 31, 1997,  the Company had working  capital of
$1,503,808.  Based on its current  operating plan, the Company  believes it will
have  sufficient  working capital to fund its operations for the next 12 months.

<PAGE>

It is not expected that revenues  from  operations  will be sufficient to enable
the  Company to  complete  the  necessary  regulatory  approval  process for its
products currently under development,  or if any such approval were obtained, to
begin  manufacturing or marketing such products on a commercial basis. Given the
Company's limited financial resources, the uncertainty of the development effort
and the necessity for regulatory approval, there can be no assurance of ultimate
success  with  respect to any  product  development  program  or that  resulting
product, if any, will be commercially  successful.  Additionally,  the Company's
limited resources will require  substantial  support from corporate partners who
would  ultimately  introduce the Company's  products  into the  marketplace.  In
addition to support from  corporate  partners,  the Company may seek  additional
financing to fund its operating requirements. There can be no assurance that the
Company will be able to obtain such  partnering  arrangements  or financing,  or
that  such  partnering  arrangements  or  financing,  if  available,  will be on
acceptable  terms.  In the event  that the  Company  fails to raise any funds it
requires,  it may be necessary  for the Company to cease  operations or severely
limit growth.

         Lack  of  Marketing  Experience;  Dependence  on  Outside  Parties  for
Marketing and  Distribution;  Uncertainty  of Market  Acceptance of Products and
Proposed  Products.  The marketing and  distribution of IodoZyme is conducted by
West Agro  pursuant to an  exclusive  marketing  and supply  agreement  with the
Company which covers  IodoZyme as well as other  products which may be developed
for use in dairy facilities. The Company intends to rely on similar arrangements
with others for the marketing and  distribution of its products  currently under
development,  if and when  successfully  developed  and  approved by  applicable
regulatory agencies.  This results, and will result, in a lack of control by the
Company over some or all of the marketing  and  distribution  of such  products.
Although  the Company has  entered  into  development  agreements  with  parties
experienced in the marketing of some of the Company's proposed  products,  which
development agreements contemplate future marketing  arrangements,  there can be
no  assurance  that  the  Company  will be  able to  enter  into  any  marketing
arrangements  for such products,  if and when developed,  on terms acceptable to
the Company or that any  marketing  efforts  undertaken on behalf of the Company
will be  successful.  Although  the Company  has no present  plans to do so, the
Company may, in the future, determine to directly market certain of its proposed
products.  The Company has no marketing  experience and  significant  additional
capital  expenditures  and management  resources  would be required to develop a
direct  sales  force.  In the  event  the  Company  elects  to  engage in direct
marketing  activities,  there can be no assurance that the Company would be able
to obtain  the  requisite  funds or  attract  and  retain  the  human  resources
necessary to successfully market any of such products.


<PAGE>

         The Company's  future growth and  profitability  will depend,  in large
part, on the success of its personnel and others conducting marketing efforts on
behalf of the Company in fostering  acceptance  among the various markets of the
use of the Company's  products as an alternative to other available  products or
otherwise. The Company's success in marketing its products will be substantially
dependent   on   educating   its   targeted   markets  as  to  the   distinctive
characteristics  and  perceived  benefits  of the  Company's  products.  In this
regard, West Agro, which acts as exclusive marketer and distributor of IodoZyme,
also  markets and  distributes  products  which are  directly  competitive  with
IodoZyme. There can be no assurance that the Company's efforts or the efforts of
others  will be  successful  or that any of the  Company's  products or proposed
products will be favorably accepted among the targeted markets.

         Dependence  Upon,  and Need for,  Key  Personnel.  The Company does not
currently have a President or Chief Executive Officer.  The Company is dependent
on the services of Dr. Jack H.  Kessler,  the  Chairman of the Board,  Executive
Vice President,  Chief Scientific Officer, Secretary and a principal stockholder
of the Company, and Paul C. Desjourdy, Executive Vice President, Chief Financial
Officer,  Treasurer  and a director of the  Company.  The loss of either of such
individuals  or a reduction in the time devoted by such persons to the Company's
business  could have a material  adverse effect on the Company's  business.  The
Company has obtained  key-person  life insurance  coverage in the face amount of
$1,000,000 for Dr. Kessler naming the Company as beneficiary  under such policy.
The Company's success also will depend, in large part, on its ability to attract
and retain highly qualified  scientific and business personnel,  competition for
which is intense.  There can be no  assurance  that the Company  will be able to
attract and retain the necessary personnel to implement its business plan.

         Intense  Competition  and Rapid  Technological  Change.  The Company is
engaged  in  rapidly  evolving  and highly  competitive  fields.  There are many
companies,  including large  pharmaceutical and chemical  companies,  which have
established a significant  presence in the markets which the Company's  products
and  proposed  products are designed to address.  Most of these  companies  have
substantially  greater  capital  resources,  research  and  development  staffs,
facilities and experience in obtaining regulatory  approvals,  as well as in the
manufacturing,  marketing and distribution of products,  than the Company. There
can  be no  assurance  that  the  Company's  competitors  will  not  succeed  in
developing  technologies  and products  that are more  effective and less costly
than any  products  developed  or being  developed by the Company or which could
render the Company's microbicide technology obsolete.

         Uncertain  Protection of Patents and  Proprietary  Rights.  The Company
considers  patent  protection  of its  technology to be critical to its business
prospects.  There  can  be  no  assurance  that  the  Company's  pending  patent

<PAGE>

applications  will issue as patents,  that any issued  patents  will provide the
Company with significant competitive advantages,  or that challenges will not be
instituted  against the  validity or  enforceability  of any patent owned by the
Company or, if instituted, that such challenges will not be successful. The cost
of litigation to uphold the validity and prevent  infringement of patents can be
substantial.  Furthermore,  there  can be no  assurance  that  others  will  not
independently  develop  similar or more advanced  technologies  or design around
aspects of the  Company's  technology  which may be patented,  or duplicate  the
Company's trade secrets. In some cases, the Company may rely on trade secrets to
protect its  innovations.  There can be no assurance  that trade secrets will be
established,  or that secrecy  obligations will be honored,  or that others will
not  independently  develop similar or superior  technology.  To the extent that
consultants,   key  employees  or  other  third   parties  apply   technological
information  independently  developed by them or by others to Company  projects,
disputes may arise as to the proprietary  rights to such  information  which may
not be resolved in favor of the Company.

         Materials Incompatibility. An important aspect of the Company's present
and future  microbicides  is that they must be  compatible  with the surfaces on
which  they come in  contact.  The  Company  has  ceased  efforts  to  develop a
microbicide  for  dental  handpieces  and  renal  control  units as a result  of
staining and  corrosion  caused by required  microbicide  formulations,  and the
Company has  encountered  problems of staining in connection with its efforts to
develop a high level disinfectant for flexible endoscopes. The Company continues
to investigate the balance  between the level of  microbicidal  efficacy and the
need to avoid staining and corrosion.  For any proposed inanimate object product
applications,  staining or corrosion  from a microbicide  could be sufficient to
limit or  forestall  regulatory  approval of such  microbicide  or, if approved,
could adversely affect market  acceptance of such  microbicide.  There can be no
assurance  that the Company will be  successful  in  overcoming  any problems of
materials incompatibility.

         Potential Product Liability and Lack or Insufficiency of Insurance. The
Company's business will expose it to potential product liability risks which are
inherent  in the  testing,  manufacturing,  marketing  and  sale of  microbicide
products for animal and human use. If  available,  product  liability  insurance
generally is expensive. The Company currently has product liability insurance in
amounts  that  it  believes  are  adequate  to  protect  it  against   potential
liabilities.  However,  there  can be no  assurance  to such  effect or that the
Company will be able to maintain  such  insurance on  acceptable  terms.  In the
event of a  successful  suit  against the Company,  a lack or  insufficiency  of
insurance  coverage  could  have a  material  adverse  effect  on the  Company's
business and operations.


<PAGE>

         Charge to Income in the Event of Release of Restrictions on Shares.  In
connection with the Company's initial public offering,  certain  stockholders of
the Company agreed to transfer an aggregate of 700,000 shares of Common Stock to
the Company if the Company does not attain certain minimum earnings  thresholds.
In the event the Company attains any of such earnings  thresholds,  the position
of the  Securities  and  Exchange  Commission  is  that  the  release  of  these
restrictions  will be treated as expense to the Company  which is  nondeductible
for  income  tax  purposes.  (See  "Note E -  Capitalization"  to the  Company's
Financial  Statements set forth in the Annual Report on Form 10-KSB for the year
ended  December 31,  1996.)  Accordingly,  the Company will, in the event of the
release of the  restrictions,  recognize during the period in which the earnings
thresholds  are met or  probable  of being  met,  what  could  be a  substantial
one-time  charge  which would have the effect of  substantially  increasing  the
Company's  loss or  reducing  or  eliminating  earnings,  if any,  at such time.
Although  the amount of expense  recognized  by the Company  will not affect the
Company's total  stockholders'  equity,  it may have a depressive  effect on the
market price of the Company's securities.

         Possible  Adverse  Effects of  Authorization  of Preferred  Stock.  The
Company's  Certificate  of  Incorporation  authorizes  the issuance of 5,000,000
shares of preferred  stock on terms which may be fixed by the Company's Board of
Directors  without  further  stockholder  action.  The  terms of any  series  of
preferred stock, which may include priority claims to assets and dividends,  and
special voting rights, could adversely affect the rights of holders of the Class
A Common  Stock.  The issuance of such  preferred  stock could make the possible
takeover  of the  Company  or the  removal of  management  of the  Company  more
difficult,  discourage  hostile  bids  for  control  of  the  Company  in  which
stockholders  may receive  premiums for their shares of Class A Common Stock, or
otherwise  dilute the  rights of holders of Class A Common  Stock and the market
price of the Class A Common Stock.
The Company has no current plans to issue any shares of preferred stock.

         Possible Volatility of Stock Price. The market prices for securities of
emerging  and  development  stage  companies in general,  and  biopharmaceutical
companies  in  particular,   have  historically  been  highly  volatile.  Future
announcements  concerning the Company or its competitors,  including the results
of testing,  technological  innovations or new commercial  products,  government
regulations,  developments  concerning proprietary rights,  litigation or public
concern as to safety of products  developed by the Company or others, may have a
significant adverse impact on the market price of the Company's securities.

         Shares  Eligible  For Future  Sale;  Outstanding  Warrants And Options;
Registration  Rights. Of the Company's  2,913,234 shares of Class A Common Stock
currently outstanding,  1,234,262 shares are "restricted securities," as defined

<PAGE>

in Rule 144 of the  Securities  Act, and all 1,234,262  shares of Class A Common
Stock are eligible for sale under Rule 144. The Company is unable to predict the
effect  that  sales  made under  Rule 144,  or  otherwise,  may have on the then
prevailing  market price of the Common Stock. Any substantial sale of restricted
securities  pursuant to Rule 144 may have an adverse  effect on the market price
of the  Common  Stock.  456,500  shares of Class A Common  Stock  issuable  upon
exercise of stock options have been  registered on a  registration  statement on
Form S-8.

         The Company has  outstanding  (i) Class A Warrants and Class B Warrants
which could  result in the issuance of  4,372,080  additional  shares of Class A
Common  Stock,  and (ii) 456,500  shares of Class A Common Stock  issuable  upon
exercise of options  which have been granted  under the  Company's  Option Plans
(the  "Plans").  In connection  with the  Company's IPO the Company  issued Unit
Purchase  Options  ("UPO")  to  the  underwriter  of the  IPO  which  UPO's  are
convertible  into  100,000  shares  of Class A  Common  Stock,  100,000  Class A
Warrants and 100,000 Class B Warrants.  The  foregoing  options and warrants are
likely  to be  exercised  at a time  when the  Company  might be able to  obtain
additional  equity capital on more favorable  terms. In addition,  to the extent
they are  exercised,  they will decrease the  percentage of the Company owned by
the Company's  stockholders.  While these options and warrants are  outstanding,
they may adversely affect the terms on which the Company could obtain additional
capital.  The Company  cannot  predict the effect,  if any, that market sales of
Class A Common Stock, the exercise of options or warrants or the availability of
such Class A Common Stock for sale will have on the market price prevailing from
time to time.  In  addition,  if the  exercise  price of options or warrants are
adjusted  downward,  such  options or  warrants  may be  exercised  sooner  than
otherwise  with a  resulting  increase in the number of shares of Class A Common
Stock available for sale on the market.

         Possible  Delisting of  Securities  from the NASDAQ System and Possible
Market Illiquidity.  There can be no assurance that the Company will continue to
meet the criteria for continued  listing of  securities  on NASDAQ.  In order to
qualify for continued  listing on the NASDAQ System, a company must, among other
things,  have at least  $2,000,000  in total  assets,  $1,000,000 in capital and
surplus,  a minimum  bid price of $1.00 per share of common  stock,  and 100,000
shares in the public float. In addition, the common stock must have at least two
registered and active market makers and must be held by at least 300 holders and
the market  value of its public  float must be at least  $200,000.  If an issuer
does not meet the $1.00 minimum bid price standard,  it may, however,  remain in
NASDAQ if the market  value of its public float is at least  $1,000,000  and the
issuer has  capital  and  surplus of at least  $2,000,000.  NASDAQ has  proposed
changes to the criteria for  continued  listing of  securities.  These  proposed
changes are currently being  considered by the SEC, and if approved,  would make
it more  difficult  for the Company to maintain  its NASDAQ  listing.  Under the

<PAGE>

proposed  criteria,  among  other  things,  the  Company  would have to have net
tangible  assets (total assets less total  liabilities and goodwill) of at least
$2,000,000,  a minimum bid price of $1.00 per share of common  stock and 500,000
shares in the public  float.  In addition,  the market value of its public float
must be at least  $1,000,000.  At March 31, 1997,  the  Company's  balance sheet
reflects total assets of  $2,159,279,  capital and surplus of $1,730,152 and net
tangible  assets of $1,610,970.  If the Company should become unable to meet the
continued listing criteria of NASDAQ and is delisted therefrom, trading, if any,
in  the  Class  A  Common   Stock  would   thereafter   be   conducted   in  the
over-the-counter  market in the so-called  "pink sheets" or, if then  available,
the "OTC Bulletin Board Service." As a result,  an investor would likely find it
more difficult to dispose of, or to obtain  accurate  quotations as to the value
of, the Company's  securities.  If the Company's  securities  were delisted from
NASDAQ,  they may become subject to penny stock  restrictions.  If the Company's
securities were subject to the rules on penny stocks,  the market  liquidity for
the Company's securities could be severely adversely affected.

         Disclosure Relating to Low Priced Securities;  Possible Restrictions on
Resales of Low Priced  Securities and on Broker-Dealer  Sales;  Possible Adverse
Effect of "Penny Stock" Rules on Liquidity for the Company's Securities.  If the
Company's  securities  were  removed  from NASDAQ (see  "Possible  Delisting  of
Securities from the NASDAQ System and Possible Market Illiquidity"  above), they
may become subject to rule 15g-9 under the Securities  Exchange Act of 1934 (the
"1934  Act"),   which  imposes   additional   sales  practice   requirements  on
broker-dealers  which sell such  securities  to persons  other than  established
customers and "accredited investors" (generally,  individuals with net worths in
excess of $1,000,000 or annual incomes  exceeding  $200,000 or $300,000 together
with their spouses). For transactions covered by this Rule, a broker-dealer must
make a special suitability  determination for the purchase and have received the
purchaser's written consent to the transaction prior to sale. Consequently, such
Rule may affect the ability of broker-dealers  to sell the Company's  securities
and may affect the  ability of  purchasers  in this  offering to sell any of the
securities acquired hereby in the secondary market.

         The SEC has adopted  regulations which generally define a "penny stock"
to be any  non-NASDAQ  equity  security  that has a  market  price  (as  therein
defined)  less than $5.00 per share,  subject  to  certain  exceptions.  For any
transaction by broker-dealers  involving a penny stock, unless exempt, the rules
require  delivery  of a risk  disclosure  document  relating  to the penny stock
market prior to any such  transaction.  Disclosure  is also  required to be made
about  compensation  payable  to  both  the  broker-dealer  and  the  registered
representative  and current  quotations  for the  securities.  Finally,  monthly
statements are required to be sent disclosing  recent price  information for the
penny stock held in the account and  information  on the limited market in penny
stocks.


<PAGE>

         The foregoing penny stock  restrictions will not apply to the Company's
securities if such  securities are listed on the NASDAQ  SmallCap Market System,
are  otherwise  listed on NASDAQ and have certain  price and volume  information
provided on a current and  continuing  basis,  or if the Company  meets  certain
minimum  net  tangible  assets  or  average  revenue  criteria.  There can be no
assurance  that the Company's  securities  will qualify for exemption from these
restrictions.  In any event,  even if the Company's  securities were exempt from
any such restrictions,  the SEC has the authority,  pursuant to Section 15(b)(6)
of the 1934 Act,  to prohibit  any person  that is engaged in  unlawful  conduct
while  participating  in a distribution of a penny stock from associating with a
broker-dealer  or  participating  in a distribution of a penny stock, if the SEC
finds that such a restriction would be in the public interest.

         If the Company's  securities were subject to the rules on penny stocks,
the market liquidity for the Company's  securities  could be severely  adversely
affected.

         No Dividends Anticipated. The Company has never paid any cash dividends
on its common stock and does not anticipate the payment of cash dividends in the
foreseeable future.

         Substantial  Influence of the Market Makers. There are a limited number
of market makers which  currently make a market in the Company's  securities and
the securities are thinly traded.  Consequently,  such market makers may exert a
dominating  influence  on the market  for such  securities.  Such  market-making
activity  may be  discontinued  at any  time.  The price  and  liquidity  of the
Company's securities may be significantly  affected by the degree of any current
market maker's participation in such market.



                                                            Exhibit 11.1
                              SYMBOLLON CORPORATION

                 STATEMENT RE COMPUTATION OF PER SHARE EARNINGS

                                  The Three-Months              The Six-Months
                                   Ended June 30,               Ended June 30,
                                  ----------------              --------------
                                  1997        1996              1997      1996
                                  ----        ----              ----      ----


Net Income (Loss)............$(151,978)   $  84,805        $(365,029) $(472,709)
                             ==========   =========        ========== ==========

Primary loss per share:
 Weighted average common shares
 outstanding.................2,783,253    2,480,136        2,585,203  2,480,136

 
                       
                                                                         
Shares subject to restriction.(700,000)    (700,000)        (700,000)  (700,000)
                             ----------   ----------       ---------- ----------
                             2,083,253    1,780,136        1,885,203  1,780,136
                             ==========   ==========       ========== ==========


Loss per share (1):..........$   (0.07)   $    0.05        $   (0.19) $   (0.27)
                             ==========   ==========       ========== ==========


(1) There is no difference between primary and fully diluted income (loss) 
per share.


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED UNAUDITED FINANCIAL STATEMENT OF SYMBOLLON CORPORATION FOR THE SIX
MONTHS ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENT AS FILED IN THE FORM 10-QSB. 
</LEGEND>
<MULTIPLIER>                                  1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1997
<PERIOD-START>                                 JAN-01-1997
<PERIOD-END>                                   JUN-30-1997
<CASH>                                         1,724,648
<SECURITIES>                                           0
<RECEIVABLES>                                    142,066
<ALLOWANCES>                                           0
<INVENTORY>                                       15,672
<CURRENT-ASSETS>                               1,918,824
<PP&E>                                           239,414
<DEPRECIATION>                                   142,300
<TOTAL-ASSETS>                                 2,157,708
<CURRENT-LIABILITIES>                            572,802
<BONDS>                                                0
                                  0
                                            0
<COMMON>                                           2,931
<OTHER-SE>                                     1,580,240
<TOTAL-LIABILITY-AND-EQUITY>                   2,157,708
<SALES>                                          162,338
<TOTAL-REVENUES>                                 210,925
<CGS>                                             86,021
<TOTAL-COSTS>                                          0
<OTHER-EXPENSES>                                 283,189
<LOSS-PROVISION>                                       0
<INTEREST-EXPENSE>                                 8,563
<INCOME-PRETAX>                                 (365,029)
<INCOME-TAX>                                           0
<INCOME-CONTINUING>                             (365,029)
<DISCONTINUED>                                         0
<EXTRAORDINARY>                                        0
<CHANGES>                                              0  
<NET-INCOME>                                    (365,029)
<EPS-PRIMARY>                                       (.19)
<EPS-DILUTED>                                       (.19)
        


</TABLE>


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