SYMBOLLON CORP
S-3/A, 1997-05-16
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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      As filed with the Securities and Exchange Commission on May 16, 1997
                                                     Registration No. 333-26483

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                         PRE-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933

                              SYMBOLLON CORPORATION
             (Exact name of registrant as specified in its charter)
                                -----------------

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

                              122 Boston Post Road
                                Sudbury, MA 01776
                                 (508) 443-0165
       (Address, including zip code, and telephone number, including area
               code, of registrant's principal executive offices)
                               -----------------

                                Paul C. Desjourdy
              Executive Vice President and Chief Financial Officer
                              Symbollon Corporation
                              122 Boston Post Road
                                Sudbury, MA 01776
                                 (508) 443-0165
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                               -----------------

                                With a copy to:

                           Irwin M. Rosenthal, Esq.
                     Rubin Baum Levin Constant & Friedman
                             30 Rockefeller Plaza
                              New York, NY 10112
                                (212) 698-7700
                               -----------------

  Approximate date of commencement of proposed sale to the public:  From time to
time after the effective date of this Registration Statement.

  If the  only  securities  being  registered  on this  Form are  being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box.[ ]


<PAGE>

  If any of the securities  being registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.[x]

  If this  Form is filed  to  register  additional  securities  for an  offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering.[ ]

  If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
Registration Statement number of the earlier registration statement for the same
offering. [ ]

  If the delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
                                                                        PROPOSED           PROPOSED
                                                                         MAXIMUM            MAXIMUM
                                                      AMOUNT TO BE   OFFERING PRICE        AGGREGATE        AMOUNT OF
 TITLE OF EACH CLASS OF SECURITIES TO BE REGISTERED    REGISTERED      PER UNIT(1)     OFFERING PRICE(1) REGISTRATION FEE
- - --------------------------------------------------------------------------------------------------------------------------
<S>                                                   <C>           <C>                <C>                <C>
Class A Common Stock, par value $.001 per share.....      444,444        $   1.88        $835,554.72          $ 253.20
==========================================================================================================================
</TABLE>
- --------------
(1)  The price of $1.88 per  share,  which was the  average  of the high and low
     sales price of the Class A Common  Stock on the Nasdaq  SmallCap  Market on
     May 1,  1997,  is set forth  solely  for the  purpose  of  calculating  the
     registration  fee pursuant to Rule 457(c) under the Securities Act of 1933,
     as amended (the "Securities Act").

    THE  REGISTRANT  HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OR UNTIL THIS  REGISTRATION  STATEMENT SHALL BECOME EFFECTIVE
ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION,  ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.

<PAGE>

INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

PROSPECTUS

                     SUBJECT TO COMPLETION, DATED MAY , 1997

                              SYMBOLLON CORPORATION

                     444,444 SHARES OF CLASS A COMMON STOCK

  This  Prospectus  relates to 444,444  shares (the  "Shares") of Class A Common
Stock,  par  value  $.001  per  share  ("Class  A Common  Stock")  of  Symbollon
Corporation  (the "Company" or  "Symbollon")  which may be offered for sale from
time to time (the  "Offering")  by certain  selling  stockholders  (the "Selling
Stockholders"). See "Selling Stockholders and Plan of Distribution."

  The Shares may be offered  by the  Selling  Stockholders  from time to time in
transactions  (which may include  block  transactions)  in the  over-the-counter
market, in negotiated transactions, through the writing of options on the Shares
or a  combination  of such methods of sale, at fixed prices that may be changed,
at market prices  prevailing at the time of sale, or at negotiated  prices.  The
Selling Stockholders may effect such transactions by selling the Shares directly
to purchasers or through  broker-dealers  that may act as agents or  principals.
Such  broker-dealers  may  receive   compensation  in  the  form  of  discounts,
concessions or commissions from the Selling  Stockholders  and/or the purchasers
of Shares for whom such broker-dealers may act as agents or to whom they sell as
principals,  or both (which compensation as to a particular  broker-dealer might
be in excess of customary commissions).

  The Selling  Stockholders and any  broker-dealers  that act in connection with
the sale of the Shares as principals may be deemed to be  "underwriters"  within
the meaning of Section  2(11) of the  Securities  Act of 1933,  as amended  (the
"Securities  Act") and any  commission  received  by them and any  profit on the
resale of the Shares  and/or as  principals  might be deemed to be  underwriting
discounts and commissions under the Securities Act. The Selling Stockholders may
agree to indemnify  any agent,  dealer or  broker-dealer  that  participates  in
transactions   involving  sales  of  the  Shares  against  certain  liabilities,
including  liabilities  arising under the Securities Act. Sales of the Shares by
the Selling  Stockholders,  or even the  potential of such sales,  could have an
adverse effect on the market price of the Class A Common Stock.  There can be no
assurance  that  Selling  Stockholders  will be able to sell  some or all of the
Shares listed for sale herein.

  The  Shares  offered by this  Prospectus  may be sold from time to time by the
Selling  Stockholders  or  by  transferees,  commencing  on  the  date  of  this
Prospectus.  The Company will not receive any of the proceeds  from the sales of
the Shares by the Selling Stockholders.  The Company has agreed to indemnify the
Selling Stockholders against certain  liabilities,  including  liabilities under
the Securities Act.

  The Class A Common Stock is listed on the Nasdaq  SmallCap  Market tier of The
Nasdaq Stock Market ("Nasdaq"), under the symbol "SYMBA".

       AN INVESTMENT IN THESE SECURITIES INVOLVES A HIGH DEGREE OF RISK.
                SEE "RISK FACTORS" COMMENCING ON PAGE 7 HEREOF.

 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
               COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
                   THIS PROSPECTUS. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.

                THE DATE OF THIS PROSPECTUS IS __________, 1997

<PAGE>

                             AVAILABLE INFORMATION

   The Company is subject to the  informational  requirements  of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith,  files  reports,  proxy  statements  and other  information  with the
Securities and Exchange Commission (the "Commission").  All such reports,  proxy
statements  and other  information  may be  inspected  and  copied at the public
reference  facilities of the Commission  located at Room 1024, 450 Fifth Street,
N.W., Washington D.C. 20549, and at the Commission's Regional Offices at 7 World
Trade Center,  13th Floor,  New York, New York 10048,  and  Northwestern  Atrium
Center, 500 West Madison Street, Room 1400, Chicago, Illinois 60661-2511. Copies
of such  material  may also be  obtained  at  prescribed  rates  from the Public
Reference Section of the Commission at 450 Fifth Street,  N.W., Judiciary Plaza,
Washington,  D.C. 20549. In addition, the Commission maintains a Web site on the
Internet at  http://www.sec.gov  that contains  reports,  proxy and  information
statements and other  information of issuers that file  electronically  with the
Commission.  The Common Stock is listed on Nasdaq. Reports, proxy statements and
other  information  concerning  the Company  may be  inspected  at the  National
Association of Securities Dealers, Inc. at 1735 K Street, N.W., Washington D.C.
20006.

   This  Prospectus  constitutes a part of a Registration  Statement on Form S-3
filed by the Company with the Commission under the Securities Act (together with
all amendments,  schedules and exhibits thereto, the "Registration  Statement").
This Prospectus  omits certain of the information  contained in the Registration
Statement,  and  reference  is hereby  made to the  Registration  Statement  and
related  exhibits  for further  information  with respect to the Company and the
securities  offered  hereby.  Any  statements  contained  herein  concerning the
provisions of any document are not necessarily complete,  and, in each instance,
reference  is made to the  copy of such  document  filed  as an  exhibit  to the
Registration  Statement  or  otherwise  filed  with the  Commission.  Each  such
statement is qualified in its entirety by such reference.

   The  Company  intends to furnish its  security  holders  with annual  reports
containing audited financial statements and such interim unaudited reports as it
deems appropriate.

                      DOCUMENTS INCORPORATED BY REFERENCE

   The following documents filed with the Commission by the Company (File No. 0-
22872) are hereby incorporated by reference into this Prospectus:

   (1) The  Company's  Annual  Report on Form  10-KSB for the fiscal  year ended
December 31, 1996,  including  information  from the Company's  Proxy  Statement
incorporated therein.

   (2) The Company's Quarterly Report on Form 10-QSB for the fiscal quarter 
ended March 31, 1997.

   All documents  filed by the Company with the  Commission  pursuant to Section
13(a),  13(c),  14 or 15(d) of the Exchange Act  subsequent  to the date of this
Prospectus and prior to the termination of the Offering registered hereby shall 
be deemed to be incorporated by reference  into this  Prospectus and to be a 
part hereof from the date of the filing of such document.

                                      2
<PAGE>

   Any  statement  contained  in  a  document   incorporated  or  deemed  to  be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
(or  in  any  subsequently  filed  document  that  also  is or is  deemed  to be
incorporated by reference  herein)  modifies or supersedes  such statement.  Any
such  statement  so modified  or  superseded  shall not be deemed,  except as so
modified or superseded, to constitute a part of this Prospectus. All information
appearing in this  Prospectus  is qualified in its entirety by  information  and
financial  statements  (including the notes thereto)  appearing in the documents
incorporated  by  reference  herein,  except to the  extent set forth in the two
immediately preceding sentences.

   The Company will provide,  without  charge,  to each person to whom a copy of
this Prospectus is delivered,  including any beneficial  owner,  upon written or
oral  request  from  such  person,  a copy  of  any  or  all  of  the  documents
incorporated by reference herein (other than exhibits to such documents,  unless
such exhibits are  specifically  incorporated  by reference into the information
that the  Prospectus  incorporates).  Requests  should  be  directed  to Paul C.
Desjourdy,  Symbollon Corporation, 122 Boston Post Road, Sudbury,  Massachusetts
01776, telephone number (508) 443-0165.


                               PROSPECTUS SUMMARY

 THE FOLLOWING  SUMMARY SHOULD BE READ IN CONJUNCTION  WITH, AND IS QUALIFIED IN
ITS  ENTIRETY  BY, THE MORE  DETAILED  INFORMATION  IN THIS  PROSPECTUS.  UNLESS
OTHERWISE  INDICATED,  THE INFORMATION  CONTAINED IN THIS PROSPECTUS  ASSUMES NO
EXERCISE OF ANY OTHER  OUTSTANDING  WARRANTS OR OPTIONS.  CERTAIN  STATEMENTS IN
THIS PROSPECTUS  CONSTITUTE  "FORWARD-LOOKING  STATEMENTS" WITHIN THE MEANING OF
THE  PRIVATE  SECURITIES  LITIGATION  REFORM ACT OF 1995.  SUCH  FORWARD-LOOKING
STATEMENTS  INVOLVE  KNOWN AND UNKNOWN  RISKS,  UNCERTAINTIES  AND OTHER FACTORS
WHICH MAY CAUSE THE ACTUAL RESULTS,  PERFORMANCE OR ACHIEVEMENTS OF THE COMPANY,
OR  INDUSTRY  RESULTS,  TO BE  MATERIALLY  DIFFERENT  FROM ANY  FUTURE  RESULTS,
PERFORMANCE,  OR  ACHIEVEMENTS  EXPRESSED  OR  IMPLIED  BY SUCH  FORWARD-LOOKING
STATEMENTS. SUCH FACTORS INCLUDE, AMONG OTHERS, THE FOLLOWING: DELAYS IN PRODUCT
DEVELOPMENT;  PROBLEMS OR DELAYS  WITH  CLINICAL  TRIALS;  FAILURE TO RECEIVE OR
DELAYS IN RECEIVING REGULATORY  APPROVAL;  LACK OF ENFORCEABILITY OF PATENTS AND
PROPRIETARY  RIGHTS;  LACK  OF  REIMBURSEMENT;  GENERAL  ECONOMIC  AND  BUSINESS
CONDITIONS;   INDUSTRY   CAPACITY;   INDUSTRY   TRENDS;   DEMOGRAPHIC   CHANGES;
COMPETITION;  MATERIAL  COSTS  AND  AVAILABILITY;  THE  LOSS OF ANY  SIGNIFICANT
CUSTOMERS;  CHANGES  IN  BUSINESS  STRATEGY  OR  DEVELOPMENT  PLANS;  QUALITY OF
MANAGEMENT;  AVAILABILITY,  TERMS AND DEPLOYMENT OF CAPITAL;  BUSINESS ABILITIES
AND JUDGMENT OF PERSONNEL;  AVAILABILITY OF QUALIFIED PERSONNEL;  CHANGES IN, OR
THE FAILURE TO COMPLY WITH, GOVERNMENT REGULATIONS; AND OTHER FACTORS REFERENCED
IN THIS PROSPECTUS.

                                       3
<PAGE>

                                  THE COMPANY

 The Company is a  development  stage  company  engaged in the  development  and
commercialization  of innovative  and  cost-effective  medical and  agricultural
products for various  applications.  The Company's current and proposed products
are derived from its  proprietary  platform iodine  technologies.  The Company's
strategy is to apply its platform  technologies  to the  development of multiple
products that address unmet therapeutic needs or offer improved,  cost-effective
alternatives to current products.  Products currently under development focus on
a  treatment  for stomach  ulcers and the  treatment  of various  dermatological
diseases.  Additional  development efforts regarding the Company's  technologies
for  use  in  medical   instrument   sterilization  and  hemodialysis   membrane
disinfection were conducted during 1996 at various  universities and other third
party laboratories  through grants from the Small Business  Innovation  Research
("SBIR")  program.  The  Company's  proposed  products are in various  stages of
preclinical development.

         The Company has  developed  proprietary  iodine  technologies  that the
Company believes  address many of the issues  associated with the use of iodine.
The technologies  control the equilibrium  ratio of molecular iodine (I2), which
is lethal to  microorganisms,  to other inactive  species of iodine in solution.
The  Company  believes  that  this  will  enable  it  to  produce   iodine-based
applications having advantages over currently available  iodine-based  products.
By increasing the equilibrium  ratio of molecular iodine to other iodine species
in  solution,  the  Company's  current and proposed  products  will have greater
killing power per unit of total iodine.  The Company  believes that this feature
will  enable its  current  and  proposed  products  to utilize  less  iodine and
therefore minimize or eliminate some of the negative characteristics  associated
with the use of iodine.

         In addition,  unlike other iodine-based  products,  which are generally
sold in solution,  applications based on the Company's  technologies may be sold
in either solid form such as tablets or powders or in  combinations  of liquids,
powders and gels.

         Overall,  the Company believes that the major strengths of its patented
technologies  are the minimization of staining and color associated with iodine,
broad  spectrum of  antimicrobial  activity,  rapidity of cidal  activity,  safe
residues,  no known  resistance,  and no environmental  disposal  concerns.  The
primary  weaknesses of the Company's  technologies  are the  inconvenience  of a
multi-part delivery system and the potential for staining and corrosivity.

         The  Company  focused a majority  of its  initial  development  efforts
regarding   its   technologies   on  a  bovine  teat   sanitizer,   marketed  as
"IodoZyme(R)".  The Company co-developed IodoZyme with West Agro, Inc. of Kansas
City,  MO ("West  Agro"),  a  subsidiary  of the Tetra Laval Group and a leading
manufacturer  and  distributor  of  iodophor-based  products  for dairy use.  In
January 1995, the Company and West Agro signed a marketing and supply  agreement
covering IodoZyme, and the Company began shipping IodoZyme to West Agro in early
1995. Pursuant to this agreement,  West Agro was granted the exclusive worldwide
right to market, 

                                       4
<PAGE>

distribute, promote and sell IodoZyme. Under the agreement, the Company 
manufactures and supplies West Agro with IodoZyme in finished  product form.


         Total  product  sales from IodoZyme for 1995 and 1996 were $122,981 and
$117,906, respectively, and for the three months ended March 31, 1997 were none.
Substantially all sales were in the United States. West Agro, through its 
foreign affiliates, has begun the registration process in several foreign 
markets, for which clearances must be received prior to sales in those foreign 
markets.

         The Company's current  development efforts are focused on the following
proposed products:

         Ulcer  Treatment - In June 1995, the Company entered into an Evaluation
and Option Agreement with Astra Merck Inc. ("Astra") to explore the possible use
of the Company's  technology  against  Helicobacter  pylori for the treatment of
stomach ulcers. Pursuant to that agreement, during 1996 the Company continued to
evaluate  formulations  in  animal  studies  paid  for  by  Astra.  The  Company
anticipates  screening  additional  formulations  over the course of 1997.  Upon
completion  of the  studies,  Astra has six  months to  evaluate  the  Company's
technology  and,  in  Astra's   discretion,   to  negotiate  a  development  and
commercialization  agreement  covering  the  technology  for use as a  treatment
against  Helicobacter  pylori  in the  gastrointestinal  tract.  There can be no
assurance  that  Astra  will  enter  into a  development  and  commercialization
agreement with the Company.

         Dermatology  - In May 1996,  the  Company  signed a  collaboration  and
license  agreement  with  Oclassen   Pharmaceuticals,   Inc.   ("Oclassen")  for
dermatological  products based on Symbollon's  proprietary iodine  technologies.
Pursuant to the  agreement,  the companies  plan to co-develop  products for the
treatment of certain skin diseases, with initial development focused on products
for acne, bacterial and fungal skin diseases.  Under the terms of the agreement,
Oclassen obtained exclusive marketing rights in the United States and Canada for
dermatological  products based on Symbollon's  iodine  technologies.  Subject to
continuation of the agreement, Oclassen will make a series of milestone payments
to  Symbollon,  plus royalty  payments on product  sales.  Oclassen is primarily
responsible for product development and  commercialization.  Symbollon consults,
for a fee, on the product development.  During 1996, the parties worked together
to  evaluate  suitable  formulation  candidates  for  application  in the field.
Symbollon  anticipates that work under the arrangement will continue  throughout
1997.  There can be no assurance that Oclassen will continue this agreement,  or
that the Company will receive any milestone payments or royalties thereunder.

         The Company believes that its microbicide  technologies  have potential
applications  in the  development  of a variety  of human  healthcare  and other
products such as topical  anti-infectives,  oral care and hygiene  products,  an
antimicrobial  ophthalmic  application,  and iodine deficiency diseases, such as
fibrocystic  breast syndrome.  Given the Company's limited  resources,  although
certain  preliminary  research,  development  and  regulatory  activities may be
undertaken  by the  Company  in some  of  these  potential  product  areas,  the
Company's  ability  to  fund  the  development  and  commercialization  of  such
applications will depend in large part on entering into product

                                       5
<PAGE>


development and commercialization  agreements with  corporate partners.  Neither
the Company's success in entering into such corporate  partnerships  nor the  
development  and commercialization of products by the Company can be assured.

         In  1989,  the  Company  entered  into  an  agreement  with  Biomedical
Development  Corporation  located in San Antonio,  Texas ("BDC") to cooperate in
applying for and performing under SBIR grants based on the Company's technology.
The Small Business  Innovation  Development Act of 1982 requires agencies of the
Federal  government  engaged in research to set aside a specified  percentage of
their research budgets for grants ranging from approximately  $50,000 to $75,000
for Phase I and up to $500,000 to $600,000 for Phase II.

         The  Company is  required to pay to BDC a royalty of 5% of net sales up
to a maximum of the amount of the SBIR grant related to the product. To date, an
aggregate of $1,475,000 in SBIR funding  under eight  different  grants has been
received by BDC for funding of various  projects.  Research is ongoing regarding
medical  instrument  sterilization  through  a Phase II SBIR  grant of  $500,000
received in 1994 and hemodialysis  membrane disinfection through a Phase II SBIR
grant of $600,000 received in 1994 under the auspices of BDC.

        The  Company's  commercialization  strategy  is to seek  joint  venture,
licensing or  collaborative  arrangements  for the  development,  manufacturing,
marketing and sale of its products.


                                  THE OFFERING

Securities offered.................  444,444 shares of Class A Common Stock by
                                     the Selling Stockholders. See "Description
                                     of Common Stock" and "Selling Stockholders
                                     and Plan of Distribution." (1)



   Voting Securities outstanding
     prior to the Offering.........  2,468,790 shares of Class A Common Stock(2)
                                     15,738 shares of Class B Common Stock (3)
                                     444,444 shares of Series A Preferred Stock

   Voting Securities outstanding
     subsequent to the Offering....  2,913,234 shares of Class A Common Stock(2)
                                     15,738 shares of Class B Common Stock


Risk Factors.......................  Investment in the securities offered hereby
                                     is speculative and involves a high degree
                                     of risk. See "Risk Factors."



NASDAQ SmallCap Market Symbol:
 Class A Common Stock..............  SYMBA
- -----------
(1)  The Selling Stockholders are required to convert 444,444 shares of Series A
     Preferred

                                       6
<PAGE>

     Stock,  $.001 par value (the  "Preferred  Stock")  into an equal number of 
     shares of Class A Common Stock are being registered for resale  hereunder  
     prior to the effective date of the Registration Statement.
(2)  Does not include any shares of Common Stock  issuable  upon the exercise of
     any currently outstanding options or warrants.
(3)  The Class B Common  Stock is entitled to five votes per share,  whereas the
     the Class A Common  Stock and Series A Preferred  Stock are entitled to one
     vote per share.


                                  RISK FACTORS

   An  investment in the  securities  offered  hereby  involves a high degree of
risk.  In  addition  to  the  other  information  in  this  Prospectus  and  the
information  incorporated herein by reference, the following risk factors should
be considered  carefully by potential  purchasers in evaluating an investment in
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  Uncertainies 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.

                                       7
<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,
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

                                       8
<PAGE>


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 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

                                       9
<PAGE>


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.
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

                                       10
<PAGE>


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.

         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,

                                       11
<PAGE>


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  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.

                                       12
<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.  To date,  the Company has issued  444,444  shares of Preferred
Stock which shares are to be  converted  into a like number of shares of Class A
Common Stock prior to the  effectiveness of the registration for resale pursuant
to the  Registration  Statement.  The Company has no current  plans to issue any
additional 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,  1,678,706  shares are "restricted  securities," as defined in Rule
144 of the Securities  Act. Of the 1,678,706  "restricted  securities,"  444,444
shares are being  registered for resale in the Offering and all 1,678,706 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.

                                       13
<PAGE>

   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.  NASSAQ 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 proposed
criteria, among other things, the Company would have to have net tangible assets
(total  assets less total  liabilities)  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.

                                       14

<PAGE>

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.

         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  

                                       15
<PAGE>

liquidity  of the Company's securities may be significantly  affected by the 
degree of any current market maker's participation in such market.

                                USE OF PROCEEDS

   The Company will not receive any proceeds  from the sale of the Shares by the
Selling Stockholders.

                         DESCRIPTION OF THE COMMON STOCK

   The Company has  authorized  18,750,000  shares of Class A Common Stock,  par
value $.001 per share and 1,250,000 shares of Class B Common Stock, par value
$.001 per share (the Class A Common Stock and the Class B Common Stock are 
collectively referred to as the "Common Stock"). Upon  commencement of the 
Offering, there were 2,913,234 shares of Class A Common Stock and 15,738 shares
of Class B Common Stock outstanding.  The holders of the Class A Common Stock 
are  entitled to one vote per share and the holders of the Class B Common Stock
are entitled to five vote per share with respect to all matters on which holders
of the Common Stock are entitled to vote.

   Holders of the Common Stock have the right to dividends from funds legally 
available therefor,  when, as and if declared by the Board of Directors, are 
entitled to share ratably in all of the assets of the Company  available for
distribution to holders  of shares of Common Stock and do not have preemptive, 
subscription, or conversion rights.  There are no redemption or sinking  fund 
provisions for the benefit of the Common Stock in the Certificate of 
Incorporation.  All outstanding shares of Common Stock are validly issued, fully
paid and non-assessable.

                 SELLING STOCKHOLDERS AND PLAN OF DISTRIBUTION

   The Shares may be offered  by the  Selling  Stockholders from time to time in
transactions  (which may include  block  transactions)  in the  over-the-counter
market,  in  negotiated  transactions  (including,  without  limitation,  equity
security  exchanges),  through  the  writing  of  options  on  the  Shares  or a
combination  of such methods of sale,  at fixed  prices that may be changed,  at
market  prices  prevailing at the time of sale,  or at  negotiated  prices.  The
Selling Stockholders may effect such transactions by selling the Shares directly
to purchasers or through  broker-dealers  that may act as agents or  principals.
Such  broker-dealers  may  receive   compensation  in  the  form  of  discounts,
concessions or commissions from the Selling  Stockholders  and/or the purchasers
of Shares for whom such broker-dealers may act as agents or to whom they sell as
principals,  or both (which compensation as to a particular  broker-dealer might
be in excess of customary commissions).

   The Selling  Stockholders and any broker-dealers  that act in connection with
the sale of the Shares as principals may be deemed to be  "underwriters"  within
the meaning of Section 2(11) of the Securities  Act and any commission  received
by them and any profit on the resale of the Shares and/or as principals might be
deemed to be underwriting  discounts and  commissions  under the Securities Act.
The  Selling   Stockholders  may  agree  to  indemnify  any  agent,   dealer  or
broker-

                                       16
<PAGE>

dealer  that  participates in transactions involving sales of the Shares against
certain liabilities,  including liabilities arising under the Securities Act. 
Sales of the Shares by the Selling  Stockholders,  or even the potential of
such  sales,  could  have an adverse  effect on the market  price of the Class A
Common Stock.  There can be no assurance that Selling  Stockholders will be able
to sell some or all of the Shares listed for sale herein.

   The  following  table  sets forth  certain  information  with  respect to the
Selling  Stockholders  for whom the Company is registering the Shares for resale
to the public. The Company will not receive any of the proceeds from the sale of
the  Shares.  There are no  material  relationships  between  any of the Selling
Stockholders and the Company except as otherwise indicated. Beneficial ownership
of the  Shares by each  Selling  Stockholder  after the sale will  depend on the
number of Shares sold by each  Selling  Stockholder.  The Shares  offered by the
Selling Stockholders are not being underwritten.

<TABLE>
<CAPTION>




                                                                                                Beneficial Ownership After Offering
                              Beneficial Ownership Prior to Offering                                     if Maximum is Sold
                              --------------------------------------            Maximum         -----------------------------------
Name of                                                                       Amount to be
Selling Stockholder           Amount                      Percent(1)             Sold              Amount               Percent
- - ------------------          ------                      ----------          ------------         ------               -------
<S>                           <C>                         <C>                 <C>                 <C>                    <C>

Anthony J. Cantone            600,000(2)                      19.2%              400,000          200,000(2)               6.4%
Jack H. Kessler(3)            480,224(4)                      16.3%               44,444          435,780(4)              14.8%


</TABLE>
- ----------------
(1)  Based upon 2,468,790 shares of Class A Common Stock, 15,738 shares of Class
     B Common Stock and 444,444 shares of Series A Preferred Stock outstanding
     but also reflecting as outstanding, with respect to the relevant beneficial
     owner, the shares which that beneficial owner could acquire upon exercise 
     of options exercisable within 60 days.
(2)  Includes 400,000 shares of Series A Preferred Stock acquired from the 
     Company in an August 1996 private placement for $450,000, which  are to be
     converted  upon the  effectiveness  of the  Offering  into a like number of
     Class A Common Stock and 200,000  shares of Class A Common  Stock  issuable
     upon exercise of an option which is currently exercisable.
(3)  Dr. Kessler is the Chairman of the Board, Executive Vice President,
     Secretary and Chief Scientific Officer of the Company.
(4)  Includes 44,444 shares of Series A Preferred Stock acquired from the 
     Company in an August 1996 private placement for $50,000, which  are to be
     converted  upon the  effectiveness  of the  Offering  into a like number of
     Class A Common Stock,  22,222 shares of Class A Common Stock  issuable upon
     exercise of an option  which is  currently  exercisable,  and 1,100  shares
     owned by his minor child.


                                 LEGAL MATTERS

   Certain  legal  matters in  connection  with the  issuance of the  securities
offered  hereby will be passed upon for the Company by Rubin Baum Levin Constant
& Friedman,  New York,  New 

                                       17
<PAGE>

York.  Irwin M.  Rosenthal, a partner of Rubin Baum Levin Constant & Friedman is
a Director of the Company and may be deemed to beneficially own 279,892 shares 
of Common Stock of the Company, of which 277,372 shares of Common Stock are 
owned of record by Magar, Inc., a privately held corporation of which Mr. 
Rosenthal is a director, officer and a principal stockholder.

                                    EXPERTS

   The  financial  statements of the Company  included in the  Company's  Annual
Report on Form 10-KSB for the year ended  December  31,  1996,  incorporated  by
reference in this Prospectus,  have been audited by Richard A. Eisner & Company,
LLP,  independent  auditors,  as indicated in their report with respect thereto,
and are  incorporated  herein by reference  in reliance  upon the report of said
firm given upon their authority as experts in accounting and auditing.


   NO  DEALER,  SALESMAN  OR  OTHER  PERSON  HAS  BEEN  AUTHORIZED  TO GIVE  ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THE OFFERING OTHER
THAN THOSE CONTAINED OR  INCORPORATED  BY REFERENCE IN THE  PROSPECTUS,  AND, IF
GIVEN OR MADE,  SUCH  INFORMATION OR  REPRESENTATION  MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE COMPANY OR ANY  UNDERWRITER.  THIS PROSPECTUS DOES
NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF ANY OFFER TO BUY BY ANYONE
ANY OF THE SECURITIES  COVERED BY THIS  PROSPECTUS IN ANY  JURISDICTION IN WHICH
SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED, OR IN WHICH THE PERSON MAKING SUCH
OFFER OR  SOLICITATION  IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS
UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.

                                       18
<PAGE>


                TABLE OF CONTENTS
                                                Page
                                                ----
Available Information..........................
Documents Incorporated by Reference............
Prospectus Summary.............................
Risk Factors...................................
Use of Proceeds................................
Description of The Common Stock................
Selling Stockholders and Plan of Distribution..
Legal Matters..................................
Experts........................................


                              SYMBOLLON CORPORATION

                     444,444 SHARES OF CLASS A COMMON STOCK


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

                                  PROSPECTUS

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



                               __________, 1997

<PAGE>

                                    PART II

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

   The  following  table sets forth the  expenses  expected  to be  incurred  in
connection  with  the  issuance  and   distribution  of  the  securities   being
registered.


SEC Registration...........................   $   253.20
Printing and Engraving*....................   $ 3,000.00
Legal Fees and Expenses*...................   $ 2,000.00
Accounting Fees*...........................   $ 1,500.00
Miscellaneous*.............................   $   246.80
                                              ----------
      Total................................   $ 7,000.00
                                              ==========
- --------------
*    Estimated

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

   Reference is made to Section 145 of the Delaware General Corporation Law (the
"DGCL"),  Article TENTH of the  Registrant's  Certificate of  Incorporation,  as
amended (Exhibit 3.1),  Article VIII of the  Registrant's  By-Laws (Exhibit 3.2)
and the Indemnification Agreements entered into with certain of the Registrant's
directors and officers (Exhibit 10.6).

   Section 145 of the DGCL generally provides that a corporation is empowered to
indemnify any person who is made a party to any threatened, pending or completed
action,  suit or  proceeding by reason of the fact that he is or was a director,
officer,  employee  or agent of the  corporation  or is or was  serving,  at the
request of the corporation, in any of such capacities with another corporation 
or other  enterprise, if such director, officer, employee or agent acted in good
faith and in a manner  he  reasonably  believed  in or not  opposed  to the best
interests  of the  corporation,  and with,  respect  to any  criminal  action or
proceeding,  had no reasonable  cause to believe his conduct was unlawful.  This
statute  describes in detail the right of the  Registrant  to indemnify any such
person.

   Pursuant to Article NINETH of the  Registrant's  Certificate of Incorporation
and Article VIII of the Registrant's  By-Laws, the Registrant shall idemnify, to
the fullest  extent  permitted by the DGCL, any person,  including  officers and
directors, with regard to any action or proceeding.

   The  Registrant  has  entered  into an  indemnification  agreement  with  its
directors  and  officers.  Such  agreement  provides  that the  Registrant  will
indemnify the  indemnitee  to the fullest  extent  permitted by  applicable  law
against expenses,  including reasonable attorneys' fees,  judgments,  penalties,
fines and amounts paid in settlement  actually and reasonably incurred by him in
connection  with any  civil or  criminal  action  or  administrative  proceeding
arising  out of his 

                                      II-1
<PAGE>

performance  of his duties as a director  or officer of the Registrant  
other  than an action  initiated  by a  director  or  officer.  Such
indemnification  is  available  if the  indemnitee  acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Registrant, and with respect to any criminal action, had no reasonable cause
to believe his conduct was unlawful.

   Under such  indemnification  agreement,  the  entitlement  of a  director  or
officer to  indemnification  is  determined  by a  majority  vote of a quorum of
disinterested  directors,  or if such  quorum  either  is not  obtainable  or so
directs,  by independent  counsel or by the  stockholders or the Registrant,  as
determined   by  such  quorum  of   disinterested   directors.   Under   certain
circumstances, a party to the indemnification agreement is conclusively presumed
to have met the applicable statutory standard of conduct unless the Registrant's
Board of Directors, stockholders or independent legal counsel determine that the
relevant standard has not been met. If a change of control of the Registrant has
occurred,  the  entitlement  of such director or officer to  indemnification  is
determined by independent  counsel selected by such director or officer,  unless
such  director or officer  requests  that either the Board of  Directors  or the
stockholders  make such  determination.  The Company currently has $3,000,000 of
Director and Officer liability insurance.

   Insofar as indemnification  for liabilities  arising under the Securities Act
may be permitted to directors,  officers or persons  controlling  the Registrant
pursuant to the foregoing  provisions,  the Registrant has been informed that in
the opinion of the Commission such  indemnification  is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. See Item 17.
"Undertakings."

ITEM 16. EXHIBITS.

    (a) Exhibits

3.1      Certificate of Incorporation of the Company;  including  Certificate of
         Designations, Preferences and Rights of Series A Preferred Stock of the
         Company. (previously filed as an exhibit to Form 10-QSB for the quarter
         ended September 30, 1996 and incorporated by reference.)

3.2      By-Laws of the Company. (1)

3.3      Agreement of Merger, dated as of August 4, 1993, between the Company
         and Symbollon Corporation, a Massachusetts corporation, (including
         Certificate of Merger and other state filings). (1)

4.1      Form of Warrant Agreement among the Company, D.H. Blair Investment
         Banking Corp. (the  "Underwriter") and American Stock Transfer and
         Trust Company, including forms of Class A and Class B Warrant
         Certificates. (1)

4.2      Form of Specimen Class A Common Stock Certificate. (1)

                                      II-2
<PAGE>


4.3      Form of Stock Restriction Agreement among the Company, the Class B
         Stockholders and the Underwriter. (1)

5.1      Opinion of Rubin Baum Levin Constant & Friedman regarding legality.*

10.1     1993 Stock Option Plan of the  Company,  as amended.  (incorporated  by
         reference  to  Exhibit  A to the  Company's  1994  Annual  Stockholders
         Meeting Proxy  Statement filed under cover of Schedule 14A dated May 4,
         1994.)

10.2     Consulting and Separation Agreement, dated September 24, 1995, between
         the Company and Dr. James C. Richards. (previously filed as an exhibit
         to Form 10-KSB for the year ended December 31, 1995 and incorporated
         by reference.)

10.3     Employment Agreement, dated December 23, 1995, between the Company and
         Dr. Jack H. Kessler. (previously  filed as an  exhibit  to Form  10-KSB
         for the year ended December 31, 1995 and incorporated by reference.)

10.4     Lease dated October 1, 1992 between Stanley W. Snider and the Company.
         (1)

10.5     Form of Employment Agreement, effective July 1, 1996, between the
         Company and Paul C. Desjourdy. (previously filed as an exhibit to Form
         10-QSB for the quarter ended June 30, 1996 and incorporated by
         reference.)

10.6     Form of Indemnification Agreement between the Company and each officer
         and director of the Company. (1)

10.7     Marketing  and Supply  Agreement,  dated  January 11, 1995  between the
         Company and West Agro.  (previously  filed as an exhibit to Form 8-K of
         the Registrant dated January 11, 1995 and incorporated by reference).

10.8     Agreement, dated August 31, 1992 among the Company, Dr. Jack H. Kessler
         and Dr. Robert Rosenbaum. (1)

10.9     Promissory note dated August 1, 1993 issued by the Company to Dr. Jack
         Kessler. (1)

10.10    Form of Stock Option Agreement to be entered into between the Company
         and each option holder. (1)

10.11    Consultant Agreement between Mr. Smith and the Company dated
         March 23, 1994, as amended on September 1, 1995. (previously filed
         as an exhibit to Form 10-KSB for the year ended December 31, 1995 and
         incorporated by reference.)

10.12    Consultant  Agreement  between Dr. Mason and the Company  dated June 1,
         1994  (previously  filed as an exhibit to Form  10-QSB for the  quarter
         ended June 30, 1994 and incorporated by reference).

                                      II-3
<PAGE>


10.13    1994 Employee Stock Purchase Plan of the Company. (incorporated by
         reference to Exhibit B to the Company's 1994 Annual Stockholders
         Meeting Proxy Statement filed under cover of Schedule 14A dated
         May 4, 1994.)

10.14    1995 Non-Employee Directors' Stock Option Plan of the Company.
         (previously filed as an exhibit to Form 10-QSB for the quarter ended
         June 30, 1995 and incorporated by reference.)

10.15    Collaboration  and License  Agreement,  dated May 14, 1996  between the
         Company and  Oclassen  Pharmaceuticals,  Inc.  (previously  filed as an
         exhibit  to Form  10-QSB  for the  quarter  ended  June  30,  1996  and
         incorporated by reference.)

10.16    Stock Purchase Agreement, dated August 14, 1996, among the Company,
         Anthony J. Cantone and Jack H. Kessler. (previously filed as an exhibit
         to Form 10-QSB for the quarter ended September 30, 1996 and
         incorporated by reference.)

10.17    Loan and Security Agreement, dated March 26, 1997 between the Company
         and Silicon Valley Bank (previously filed as an exhibit to Form 10-QSB
         for the quarter ended March 31, 1997 and incorporated by reference.)

23.1     Consent of Rubin Baum Levin Constant & Friedman (included in Exhibit 
         5.1).*

23.2     Consent of Richard A. Eisner & Company, LLP.*

24.1     Power of Attorney (included on signature page hereto).
- --------------------------------
*    Previously filed.
(1)  Incorporated  by  reference  to the  corresponding  exhibit  number  of the
     Registration  Statement  on Form  SB-2  (Registration  No.  33-68828) filed
     on November 24, 1993 and declared effective on December 7, 1993.


     (b) Financial Statement Schedules

   All schedules have been omitted because they are not required or not material
or because the  required  information  is included in the  financial  statements
included elsewhere herein.

ITEM 17. UNDERTAKINGS.

   The undersigned registrant hereby undertakes:

   (a) (1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement;

                                      II-4
<PAGE>

    (i) To include any prospectus required by Section 10(a)(3) of the Securities
Act of 1933;

    (ii) To  reflect  in the  prospectus  any facts or events  arising after the
effective date of the registration  statement (or the most recent post-effective
amendment  thereof)  which  individually  or  in  the  aggregate,   represent  a
fundamental  change in the information set forth in the registration  statement.
Notwithstanding the foregoing,  any increase or decrease in volume of securities
offered (if the total dollar value of securities  offered would not exceed that 
which  was  registered)  and any deviation  from  the  low or  high  and of the 
estimated  maximum offering range may be reflected  in the form of  prospectus 
filed with the commission  pursuant to Rule 424(b) if, in the  aggregate,  the 
changes in volume and price represent no more than 20 percent change in the 
maximum aggregate offering price set forth in the "Calculation of Registration 
Fee" table in the effective registration statement.

    (iii) To  include  any  material  information  with  respect  to the plan of
distribution  not  previously  disclosed  in the  registration  statement or any
material change to such information in the registration statement;

    (2) That, for the purpose of determining  any liability under the Securities
Act of 1933,  each such  post  effective  amendment  shall be deemed to be a new
registration  statement  relating  to the  securities  offered  therein  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

    (3) To remove from  registration by means of a post-effective  amendment any
of the securities  being  registered  which remains unsold at the termination of
the offering.

   (b) Insofar as indemnification  for liabilities  arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Commission such  indemnification  is
against  public  policy as expressed in the  Securities  Act and is,  therefore,
unenforceable.  In the  event  that a claim  for  indemnification  against  such
liabilities  (other than the payment by the  Registrant of expenses  incurred or
paid by a  director,  officer or  controlling  person of the  Registrant  in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as  expressed  in the  Securities  Act and will be  governed by the final
adjudication of such issue.

                                      II-5
<PAGE>

                                   SIGNATURES

   Pursuant to the  requirements  of the  Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Sudbury, Commonwealth of Massachusetts,  on May 16,
1997.

                              SYMBOLLON CORPORATION
                                 (Registrant)


                              By:   /s/ PAUL C. DESJOURDY
                                 --------------------------------------------
                                 Executive Vice President and Chief Financial
                                 Officer



                               POWER OF ATTORNEY

  KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below
hereby severally  constitutes and appoints Paul C. Desjourdy and Jack H. Kessler
and each of them, his true and lawful  attorneys-in-fact and agents, each acting
alone,  with full power of substitution and  resubstitution,  for him and in his
name, place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement on Form S-3
and all  documents  relating  thereto,  and to file the same,  with all exhibits
thereto,  and other documents in connection  therewith,  with the Securities and
Exchange  Commission,  granting  unto said  attorneys-in-fact  and agents,  each
acting  alone full power and  authority to do and perform each and every act and
thing  necessary or advisable to be done in and about the premises,  as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming  all that said  attorneys-in-fact  and agents,  or his  substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

  Pursuant to the requirements of the Securities Act of 1933, this  registration
statement,  or amendment thereto, has been signed below by the following persons
in the capacities and on the dates indicated:

     Signature                       Title                              Date
     ---------                       -----                              ----
 /s/ Jack H. Kessler          Executive Vice-President,             May 16, 1997
- ------------------------      Chief Scientific Officer,
     Jack H. Kessler          Secretary and Chairman
                              of the Board of Directors
                              (Principal Executive Officer)

 /s/ Paul C. Desjourdy        Executive Vice President              May 16, 1997
- -------------------------     Treasurer, Chief Financial
     Paul C. Desjourdy        Officer, and Director (Principal
                              Financial and Accounting Officer)

 /s/ Paul C. Desjourdy        Director                              May 16, 1997
- -------------------------
   Attorney-In-Fact for
     Stuart M. Paley

 /s/ Paul C. Desjourdy        Director                              May 16, 1997
- -------------------------
   Attorney-In-Fact for
     Edward A. Mason

 /s/ Paul C. Desjourdy        Director                              May 16, 1997
- -------------------------
   Attorney-In-Fact for
     James C. Richards

                              Director                              May   , 1997
- --------------------------
     Irwin M. Rosenthal

                                      II-6


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