CELLEGY PHARMACEUTICALS INC
8-K, 1998-01-14
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT



     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported): December 31, 1997



                          Cellegy Pharmaceuticals, Inc.

             (Exact name of Registrant as specified in its charter)



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

       California                        0-26372                 82-0429727
(State or other jurisdiction     (Commission File Number)       (IRS Employer
     of incorporation)                                       Identification No.)

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

     1065 East Hillsdale Boulevard, Suite 418, Foster City, California 94404

          (Address of principal executive offices, including zip code)



                                 (650) 524-1600

              (Registrant's telephone number, including area code)


<PAGE>


Item 2:  Acquisition or Disposition of Assets.

         On December 31, 1997,  Cellegy  Pharmaceuticals,  Inc. (the  "Company")
acquired  certain  assets from Neptune  Pharmaceutical  Corporation  ("Neptune")
pursuant to an asset purchase  agreement (the "Agreement")  with Neptune.  Under
the Agreement,  the Company  acquired patent and related  intellectual  property
rights  relating to "Anogesic" (the "Anogesic  Acquisition"),  a topical product
candidate for the treatment of anal fissures and hemorrhoids.

         Under the terms of the Agreement,  the Company issued 429,752 shares of
Common Stock to Neptune on December  31,  1997.  Upon the signing of a letter of
intent on November  3, 1997,  33,057  shares of Common  Stock had been issued to
Neptune.  The Agreement  calls for a series of additional  payments,  payable in
shares of Common Stock, upon successful  completion of various milestones which,
if achieved,  would occur over the next several  years.  The Agreement  does not
provide  for the  payment  by the  Company of any future  product  royalties  in
connection with sales of Anogesic.

         The amount of consideration was determined through  negotiation.  There
were no material  relationships  between  the  Company and Neptune  prior to the
Anogesic Acquisition.

Item 7:  Financial Statements, Pro Forma Financial Information and Exhibits.

(a)      Financial statements of businesses acquired.

         Not applicable.

(b)      Pro forma financial information.

         Not applicable.

(c)      Exhibits.

         The following exhibits are filed herewith:

         10.1(1)  Asset Purchase  Agreement dated December 31, 1997 by and among
                  Cellegy  Pharmaceuticals,   Inc.  and  Neptune  Pharmaceutical
                  Corporation

         99.01    Press Release dated January 8, 1998

(1) Confidential treatment has been requested for portions of this exhibit.

                                       2

<PAGE>


                                   SIGNATURES

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




Date:  January 14, 1998                     By: /s/  A. Richard Juelis
                                                -------------------------------
                                                     A. Richard Juelis
                                                     Vice President, Finance &
                                                     Chief Financial Officer

                                       3

<PAGE>


                                INDEX TO EXHIBITS


      Exhibit Number       Description of Exhibit
      --------------       ----------------------
         10.1(1)           Asset Purchase  Agreement  dated December 31, 1997 by
                           and among Cellegy  Pharmaceuticals,  Inc. and Neptune
                           Pharmaceutical Corporation

         99.01             Press Release dated January 8, 1998

(1)  Confidential treatment has been requested for portions of this exhibit.

                                       4


                                                                    EXHIBIT 10.1

                            ASSET PURCHASE AGREEMENT

         This  Asset  Purchase  Agreement  (this  "Agreement")  is  dated  as of
December  31, 1997 (the  "Effective  Date"),  and is entered into by and between
Neptune  Pharmaceutical  Corporation,  a Missouri  corporation  ("Seller"),  and
Cellegy  Pharmaceuticals,  Inc., a California corporation  ("Buyer").  Buyer and
Seller are referred to collectively herein as the "Parties."


                                 R E C I T A L S

         A. Seller is a corporation that owns all right, title and interest in a
certain  nitroglycerin product candidate that is currently under development and
certain other assets.

         B. Seller desires to sell to Buyer,  and Buyer desires to purchase from
Seller,  all right, title and interest in the Acquired Assets (as defined below)
on the terms and conditions set forth in this Agreement.

         C. Seller and Buyer have previously executed a Binding Letter of Intent
dated as of November 3, 1997 (the "Letter of Intent")  regarding the purchase by
Buyer of the Acquired  Assets.  This  Agreement,  when executed and delivered by
Buyer and Seller,  is intended to supersede  and replace the Letter of Intent in
its entirety.


                                    AGREEMENT

         Buyer and Seller hereby agree as follows:

1.       DEFINITIONS.

         1.1 Definitions.  As used in this Agreement,  the following terms shall
have the following meanings:

         "Acquired  Product"  means any product or product  candidate  of Seller
relating  to  treatment  of anal  fissures  or  hemorrhoids,  including  without
limitation  Seller's  product  candidate  currently  named  "Anogesic"  for  the
treatment of anal fissures, hemorrhoids and certain other conditions.

         "Acquired Assets" means the Acquired Product, Intellectual Property and
the Other Assets.

         "Common Stock"  means the Common Stock, no par value, of Buyer.

         "Encumbrances" means all mortgages, pledges, liens, licenses, rights of
possession,  security interests,  restrictions,  encumbrances,  claims, charges,
title retention,  conditional sale or other security  arrangements,  relating to
the Acquired Assets or by which any Acquired Asset is bound or subject.

         "Intellectual Property" means U.S. Patent Nos. 5,504,117 and 5,693,676,
any related or  corresponding  foreign patents or patent  applications,  and all
other  patents,  patent  applications  (and any  reissue,  extension,  division,
improvement,  continuation or  continuation-in-part  of any

                                       5

<PAGE>


of  the  foregoing,  in  the  U.S.  or  worldwide),  worldwide,  registered  and
unregistered copyrights,  registered and unregistered  trademarks,  trade names,
service marks or service  names,  licenses or license  agreements,  clinical and
pre-clinical  data and  information,  FDA  applications  and all other materials
relating to FDA or other regulatory matters, know-how and any other intellectual
property rights or intangible rights existing under judicial or statutory law of
any  country in the world,  or under any  treaty,  owned or  licensed  by Seller
relating to the Acquired Product, any other intellectual property of Seller, and
any of the foregoing that Seller may acquire after the Closing Date that relates
to the Acquired Product (including without limitation from the person identified
in the December 18, 1997 letter  agreement  between Buyer and Seller,  with whom
Seller has an agreement dated December 29, 1997 (the "December 29  Agreement")),
whether or not listed on Schedule A attached hereto.

         "Excluded  Assets" means all accounts  receivable and cash of Seller as
of the Closing Date  (including  prepaid  expenses and deposits),  all leases of
real property to which Seller is a party or is otherwise  bound, all liabilities
and  obligations of Seller arising out of or relating to the conduct of Seller's
business or the Acquired Assets before the Closing Date, any assets, liabilities
or obligations  that Buyer  designates in writing as Excluded  Assets before the
Closing Date on Schedule B attached hereto, and any other liabilities,  debts or
obligations of Seller except for those contractual  obligations under agreements
assigned to Buyer that Buyer agrees to assume (or which are otherwise  expressly
included in the Other Assets).

         "FDA"  means the United States Food and Drug Administration.

         "Loss" means any liability,  injury,  damage,  expense,  cost,  fine or
penalty  resulting  from any  action,  proceeding,  claim,  demand,  assessment,
judgment  or  award  (including   without  limitation  costs  of  investigation,
prosecution,  defense  or  settlement),  including  attorneys  fees,  costs  and
expenses related thereto.

         "Other  Assets" means all  contracts,  agreements,  other  instruments,
files,  business  records,  accounting and financial  records,  analyses,  logs,
books, records, files, correspondence,  laboratory, test or study data, notes or
information,  of  Seller  relating  to  the  Acquired  Product  or  Intellectual
Property,  in whatever form and however maintained by Seller (whether hard copy,
in  electronic  format  maintained  by  Seller  or any  officer  of  Seller,  or
otherwise),  and whether possessed by Seller before the Closing Date or acquired
by Seller  after the Closing  Date.  The Other  Assets to be  delivered to Buyer
hereunder shall, wherever practicable, be the originals of such materials.

         "Payment Date FMV" means the actual  closing market price of the Common
Stock (as quoted on the Nasdaq  National  Market or, if the Common  Stock is not
quoted on such market, then on such national exchange or market quotation system
as the  Common  Stock is then  quoted  on) on the date the  relevant  payment or
milestone  is due or achieved  or, if  earlier,  the last  closing  price of the
Common Stock prior to public  announcement  by the Company of the achievement of
the milestone;  provided, however, that the Payment Date FMV shall in all events
be deemed to be no higher than $15.00 per share  (subject to  adjustment  in the
event of stock splits, stock dividends or other similar  recapitalizations) even
if the  actual  closing  market  price of the Common  Stock is higher  than such
amount.

                                       6

<PAGE>


         "Shares"  means  shares of  Common  Stock of Buyer  that are  issued to
Seller pursuant to Section 3 of this Agreement.

2.       PURCHASE AND SALE OF ASSETS

         2.1  Agreement  to Sell and Purchase  Assets.  Subject to the terms and
conditions of this Agreement, and in reliance on the representations, warranties
and  covenants  set forth in this  Agreement,  Seller  agrees  to sell,  assign,
transfer and convey to Buyer at the Closing (as defined below), and Buyer agrees
to  purchase  and  acquire  from  Seller at the  Closing,  all right,  title and
interest  in and to (or,  with  respect to the  portion of the  Acquired  Assets
relating to the December 29 Agreement, all of Seller's right, title and interest
in and to)  all of the  Acquired  Assets.  The  Acquired  Assets  will be  sold,
assigned,  transferred  and  conveyed to Buyer on the  Closing  Date (as defined
below), free and clear of all Encumbrances.

         2.2 Asset Transfer; Passage of Title; Delivery. Upon the Closing all of
Seller's  right title and  interest in and to all of the  Acquired  Assets shall
pass to Buyer;  and  Seller  shall  deliver  to Buyer  possession  of all of the
Acquired  Assets  and  shall  further  deliver  to  Buyer  proper   assignments,
conveyances  and bills of sale sufficient to convey to Buyer good and marketable
title to all the  Acquired  Assets in the forms  reasonably  requested by Buyer,
free and clear of all Encumbrances,  and such other instruments of conveyance as
Buyer or its counsel may reasonably  deem necessary or desirable  (either at and
after the  Closing) to effect or evidence  the  transfers  contemplated  hereby.
Physical  delivery  by Seller of all of the  Acquired  Assets  shall occur on or
before  January 12, 1998.  Physical  delivery by Buyer to Seller of the original
stock certificate  representing the Shares to be delivered at the Closing, shall
in all events occur on or before  January 9, 1998,  unless the parties  mutually
agree to a different date.

         2.3 Excluded  Assets.  Buyer does not assume any of the Excluded Assets
and shall not become  obligated to pay any amounts with respect  thereto (except
for those contractual  obligations under agreements assigned to Buyer that Buyer
agrees to assume, which obligations and agreements shall not be deemed "Excluded
Assets.") In addition,  Seller will be responsible  for any amounts owing to its
employees  that accrue before the Closing and for any amounts owing to employees
of Seller  who do not  receive  an  offer,  or who do not  accept  an offer,  of
employment with Buyer.

3.       PURCHASE PRICE; PAYMENTS; CLOSING

         3.1 Purchase Price. In consideration of the sale, transfer,  conveyance
and  assignment  of all the  Acquired  Assets  to Buyer  free  and  clear of all
Encumbrances,  the  following  amounts shall be payable by Buyer to Seller (such
payments shall be referred to collectively as the "Purchase Price"):

                  (a) Buyer has previously  delivered to Seller 33,057 shares of
Common  Stock.  Upon the  Closing,  Buyer  shall  issue to Seller an  additional
429,752 shares of Common Stock.

                  (b) Upon  successful  completion  * of * Buyer  shall issue to
Seller  shares of Common Stock  having a Payment Date FMV of *. Upon

- --------------------
*    Confidential treatment requested.

                                       7

<PAGE>


successful completion * of *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *. These  milestone  payments shall also be payable
upon *. In addition, Buyer shall pay Seller the sum of * upon *, if Seller *

                  (c) Upon *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *.

                  (d) Upon *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *.

                  (e) Upon *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *.

                  (f) Upon *, Buyer shall issue to Seller shares of Common Stock
with a Payment Date FMV of *.

                  (g) Upon *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *.

                  (h) Upon *, Buyer shall issue to Seller shares of Common Stock
having a Payment Date FMV of *.

                  (i) Upon FDA approval for  over-the-counter  ("OTC") marketing
and sales of the Acquired Product for the treatment of hemorrhoids,  Buyer shall
issue to Seller shares of Common Stock having a Payment Date FMV of $5,000,000.

         3.2 Buyer's Call Right. At each milestone at which the Payment Date FMV
is below *, the Shares issued by Buyer under Section 3.1(b) through (i) shall be
accompanied by a call right (as described below);  provided,  however, that such
call  right  shall  not be  applicable  to  that  portion  of  such  issued  and
outstanding  Shares  as is  necessary  to  maintain  a ratio of cash  (for

- --------------------
*    Confidential treatment requested.

                                       8

<PAGE>


this purpose,  calculated on a cumulative basis  (including  Shares issued under
Section 3.1(a)) with respect to each Share issued with a call right,  and valued
at * per Share for each such Share)-to-stock value (for this purpose, calculated
on a  cumulative  basis  (including  Shares  issued under  Section  3.1(a)) with
respect to each Share  issued  without a call right,  and valued at the lower of
the Payment  Date FMV or fair market value on the date of  calculation)  of less
than  one-to-one;  provided,  further,  that the  number of  Shares  issued at a
milestone  at which the Payment  Date FMV is below *, but with  respect to which
such call right is not  applicable  in accordance  with the  preceding  proviso,
shall be issued based on a deemed Payment Date FMV of * per share,  divided into
the dollar amount of the milestone  payment with respect to which Buyer does not
have a call right. Such call right shall be exercisable at the higher of (i) the
fair market value of the Share on the date of exercise of the call right or (ii)
the Payment Date FMV applicable to such Share;  provided,  however, that no call
right shall be exercisable  from and after such time as the fair market value of
a Share  issued with a call right of * or greater.  By way of example,  assuming
that * Shares are issued at the  Closing  and that the  Payment  Date FMV at the
time of the first *  milestone  payment is *, the total  value of Shares  issued
without a call right  would be *, and the total  number of Shares  that could be
issued in  satisfaction  of the  milestone  payment with a call right would be *
shares (since * x * is less than *). If at the second milestone payment date the
Payment Date FMV was *, another calculation would be required, comparing (i) the
value of the number of Shares previously issued with call rights (based on * per
Share) plus the number of Shares  potentially  issuable in  satisfaction  of the
second milestone which can have a call right, to (ii) the value of the number of
Shares  previously  issued  without call rights  (based on * per Share) plus the
number of shares  potentially  issuable in satisfaction of the second  milestone
which may not have a call right (and in making  this  calculation,  taking  into
account that once the initial  calculation  of the number of Shares  potentially
issuable  in  satisfaction  of the second  milestone  with a call right has been
made,  the  value of such  shares,  based on the  Payment  Date  FMV,  should be
subtracted  from the dollar value of the particular  milestone,  i.e., the *, to
determine the dollar value of the remaining milestone payment to be satisfied by
issuance of Shares not subject to a call right,  which  number of Shares must be
determined  based  on a  deemed  Payment  Date  FMV of * per  Share).  Under  no
circumstances  may Buyer be required to issue more  Shares  without  call rights
than is  determined  by dividing * into the dollar value of  milestone  payments
with respect to which Buyer does not have call rights  (assuming Buyer exercised
its call right at the Payment Date FMV).

         3.3 Acceleration of Certain Purchase Price Payments Upon Sale of Buyer.
All of the payments of the purchase price described in Section 3.1 above, except
for the final payment following OTC approval described in Section 3.1(i),  shall
become  due  and  payable  in  connection  with  any  sale  by  Buyer  of all or
substantially  all of its  assets to a third  party,  or any  merger or  similar
transaction in which Buyer is acquired and in which Buyer's shareholders do not,
immediately after the closing of such  transaction,  have at least a majority of
the voting  power and  equity  interest  of the  surviving  company.  Such final
payment  shall  continue  to be an  obligation  of  Buyer  or its  successor  or
acquiror, as the case may be.

         3.4 Closing.  The consummation of the purchase and sale of the Acquired
Assets  contemplated  hereby  will  take  place at a  closing  to be held at the
offices of Fenwick & West, Two Palo Alto Square,  Palo Alto California  94306 at
8:30 p.m.  Pacific  Standard  Time (the  "Closing")  on  December  31, 1997 (the
"Closing  Date"),  or at such other time or date, and at such

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*    Confidential treatment requested.

                                       9

<PAGE>


place,  or by such other means of exchanging  documents,  as may be agreed to by
the parties hereto.

         3.5 Allocation of Purchase Price. The Purchase Price shall be allocated
in the manner set forth on Exhibit A attached  hereto.  The allocation  shall be
consistent in all material respects with applicable  regulations of the Internal
Revenue Service.

4.       OBLIGATIONS AND LIABILITIES NOT ASSUMED

         4.1 Liabilities  and  Obligations  Not Assumed.  Except for liabilities
expressly  set  forth in  Section  2 above,  Buyer  shall  not  assume or become
obligated in any way to pay for any Excluded  Assets,  or liabilities,  debts or
obligations of Seller whatsoever  (collectively,  the "Liabilities"),  including
but not limited to any liabilities or obligations now or hereafter  arising from
or with respect to any other claims  brought  against  Seller by any creditor of
Seller,  or any obligations or liabilities or arising from any breach or default
by Seller of any contract, agreement or commitment of Seller.

         4.2 No Obligations to Third Parties. The execution and delivery of this
Agreement  shall not be deemed to confer  any  rights  upon any person or entity
other than the  parties  hereto,  or to make any person or entity a third  party
beneficiary of this  Agreement,  or to obligate the parties hereto to any person
or entity other than the parties to this Agreement.

5.       REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer  represents  and  warrants  to Seller  that all of the  following
statements are true, accurate and correct:

         5.1  Corporate  Organization.  Buyer is a corporation  duly  organized,
validly existing and in good standing under the laws of the State of California,
and is duly  qualified  to do business  and is in good  standing in the State of
California.  Buyer has all necessary corporate power and authority to enter into
this Agreement and all other transactions contemplated hereby.

         5.2 Authorization for this Agreement.  All corporate action on the part
of  Buyer  and  its  officers,  directors  and  shareholders  necessary  for the
authorization,  execution and delivery of this Agreement, and the performance of
all obligations of Buyer hereunder, has been taken or will be taken prior to the
Closing, and this Agreement constitutes the valid and legally binding obligation
of Buyer,  enforceable against Buyer in accordance with its terms, except (i) as
limited by applicable bankruptcy,  insolvency,  reorganization,  moratorium, and
other laws of general  application  affecting  enforcement of creditors'  rights
generally and (ii) as limited by laws relating to the  availability  of specific
performance,  injunctive relief or other equitable  remedies.  The execution and
delivery  of this  Agreement  has  been  duly  authorized  by  Buyer's  Board of
Directors,  and no further  corporate action or approval is required in order to
render this Agreement binding and enforceable against Buyer.

         5.3 No Conflict.  The execution,  delivery and  performance by Buyer of
this Agreement and the performance of Buyer's obligations hereunder will not (A)
cause a violation of Buyer's articles of  incorporation  or bylaws,  (B) cause a
breach  under,  or allow any party to  terminate,  or require the consent of any
third party under,  any  agreement to which the Buyer is a

                                       10

<PAGE>


party or by which the  business or property of Buyer is bound,  or (C) cause any
violation of law or of a judgment or order of any court or governmental body.

         5.4 Disclosure. To Buyer's knowledge, Buyer's registration statement on
Form S-1, file No. 333-38179,  declared effective by the Securities and Exchange
Commission  on November 19,  1997,  does not, as of the  effective  date of such
registration statement,  contain an omission of material fact or omit to state a
material  fact  required  to be stated  therein in order to make the  statements
contained therein not misleading.

         5.5 Tax  Consequences.  Buyer  makes no  representation  or warranty to
Seller or its  shareholders  concerning the tax consequences of the transactions
contemplated by this Agreement.

6.       REPRESENTATIONS AND WARRANTIES OF SELLER

         Seller  represents and warrants to Buyer that, except as set forth in a
schedule of exceptions dated November 3, 1997 and separately delivered by Seller
to Buyer (the "Disclosure  Letter"),  each of the following is a true,  accurate
and correct statement:

         6.1 Corporate  Organization.  Seller is a corporation  duly  organized,
validly  existing and in good standing  under the laws of the State of Missouri,
and is  qualified  or  licensed to do  business  in all states  where  Seller is
required  to be so  licensed  or  qualified,  except  for the  failure  to be so
qualified or licensed would not have any adverse effect on the Acquired Assets.

         6.2 Authorization for this Agreement.  All corporate action on the part
of  Seller  and its  officers,  directors  and  shareholders  necessary  for the
authorization,  execution and delivery of this Agreement, and the performance of
all  obligations of Seller  hereunder,  has been taken or will be taken prior to
the  Closing,  and this  Agreement  constitutes  the valid and  legally  binding
obligation of Seller,  enforceable  against Seller in accordance with its terms,
except (i) as  limited by  applicable  bankruptcy,  insolvency,  reorganization,
moratorium,  and other  laws of general  application  affecting  enforcement  of
creditors'  rights  generally  and  (ii)  as  limited  by laws  relating  to the
availability  of  specific  performance,  injunctive  relief or other  equitable
remedies.  The execution and delivery of this Agreement has been duly authorized
by Seller's Board of Directors,  and no further  corporate action or approval is
required  in order to render this  Agreement  binding  and  enforceable  against
Seller.

         6.3 No Conflict.  The execution,  delivery and performance by Seller of
this Agreement and the  performance of Seller's  obligations  hereunder will not
(A) cause a violation of Seller's articles of incorporation or bylaws, (B) cause
a breach under,  or allow any party to terminate,  or require the consent of any
third party under,  any agreement to which the Seller is a party or by which the
business or property of Seller is bound, or (C) cause any violation of law or of
a judgment or order of any court or governmental body.

         6.4 Title.  Seller  holds good and  merchantable  title to all Acquired
Assets, free and clear of any Encumbrances,  and no other party has any right or
interest whatsoever in any of the Acquired Assets,  including without limitation
any license, option, right of first refusal or right to acquire, or development,
manufacturing, marketing or distribution rights, relating to any of the Acquired
Assets.

                                       11

<PAGE>


         6.5 Litigation.  There is no claim,  action, suit or proceeding pending
or asserted  against Seller (i) that questions the validity of this Agreement or
the  right of the  Seller to enter  into this  Agreement  or to  consummate  the
transactions  contemplated hereby, or (ii) relating to or affecting the Acquired
Assets,  at law or in equity,  nor is Seller aware of any basis therefor.  There
are no  judgments,  decrees,  injunctions  or orders of any court,  governmental
department,  commission,  agency,  instrumentality  or arbitrator against Seller
affecting the Acquired Assets

         6.6 Intellectual  Property;  Other Assets. All Intellectual Property in
which Seller has any rights is set forth on Schedule A attached  hereto.  Seller
has made all filings with  governmental  agencies  and obtained all  assignments
(including  invention  assignments  from its  employees)  necessary to claim and
protect its rights (both U.S. and foreign) in all intellectual property included
in the  Acquired  Assets.  Seller  is the sole and  exclusive  owner of, or with
respect  to the  data  and  materials  covered  by the  December  29  Agreement,
possesses valid licenses to, the Acquired Assets. To Seller's knowledge,  except
for (i) the possible effect of the references  cited in connection with the U.S.
patent  applications  previously filed by Seller relating to its two issued U.S.
patents  and (ii) the fact that  Seller  has not,  prior to the  Closing,  filed
patent applications in many foreign jurisdictions, no other person or entity has
taken any actions or has materials or  intellectual  property  rights that would
materially  adversely  affect  Seller's or Buyer's  ability to claim and protect
their  rights  (both  U.S.  and  foreign)  to  enforce  any of the  Intellectual
Property,  or to  exclusive  use of the  intellectual  property  included in the
Acquired Assets. To the best of Seller's knowledge, each of the patents included
in the  Intellectual  Property  is valid and  enforceable  and will be valid and
enforceable by Buyer after the Closing Date. To Seller's knowledge,  none of the
Acquired  Assets  or their  use as  contemplated  by  Seller  infringes  upon or
violates any patent,  copyright,  trademark,  trade secret or other intellectual
property  rights of any other person or entity.  Except as set forth in Schedule
C, there are no outstanding options, licenses or agreements of any kind relating
to the  Acquired  Assets,  nor is  Seller  bound by or a party  to any  options,
licenses or agreements of any kind with respect to the intellectual  property of
any other  person or entity.  There are no other assets of Seller that relate to
the Acquired Product other than the Intellectual  Property,  and Seller does not
have any other  substantial  intellectual  property  that is not included in the
Intellectual  Property being transferred to Buyer hereunder,  and no director or
executive officer of Seller has any substantial intellectual property related to
the Acquired  Product that is not included in the  Intellectual  Property  being
transferred to Buyer hereunder.

         6.7  Brokerage  and  Finder's  Fees.  Seller  has not  agreed  to pay a
brokerage or finder's fee in connection with this Agreement.

         6.8  Authorization  for this  Agreement.  No  authorization,  approval,
consent of, or filing with any governmental  department,  bureau, agency, public
board, authority or other third party is required for the consummation by Seller
of the transactions contemplated by this Agreement.

         6.9 Taxes.  Seller has timely filed all tax returns and timely paid all
taxes due.  There are no  federal,  state or local tax liens  against any of the
Acquired Assets to be transferred to Buyer hereunder. At the Closing, there will
be no federal, state or local tax liens against or any unsatisfied liability for
taxes of any kind  imposed  on or levied  with  respect  to any of the  Acquired
Assets  other  than  liens for any such  taxes  which  have not  become  due and
payable.  Seller has paid or will pay,  when due,  any  federal,  state or local
taxes  accruing  before the Closing

                                       12

<PAGE>


Date with respect to the Acquired Assets or Seller's  business which, if unpaid,
may result in a liability of Buyer or a lien against any of the Acquired Assets.

         6.10 Financial Statements. The financial statements of Seller delivered
to Buyer fairly present the financial condition of Seller and its business as of
their respective  dates.  The financial  records relating to the Acquired Assets
have  been  provided  to  Buyer  and have  been  prepared  in a  manner  that is
consistent with Seller's internal business and financial accounting methods.

         6.11     [Reserved]

         6.12 No Undisclosed Liabilities;  Disclosure. There are no liabilities,
obligations or claims (whether contingent or otherwise) relating to the Acquired
Assets that are not disclosed in the Disclosure Letter or in Seller's  financial
statements  referred to above. To Seller's  knowledge,  the  representations and
warranties made by Seller in this Agreement, when taken together, do not contain
an  omission of material  fact or omit to state a material  fact  required to be
stated therein in order to make the statements contained therein not misleading.

         6.13  Agreements.  Schedule C hereto lists and sets forth a description
of all material licenses, proprietary rights agreements, contracts and all other
agreements,  understandings  or commitments  of Seller  relating to the Acquired
Assets ("Agreements").  Seller has delivered to Buyer a true and correct copy of
each written Agreement and has provided a written summary of any material verbal
Agreement relating to the Acquired Assets.

         6.14 Purchase Entirely for Own Account. This Agreement is made with the
Seller in reliance  upon  Seller's  representation  to Buyer,  which by Seller's
execution  of this  Agreement  Seller  hereby  confirms,  that the  Shares to be
received by Seller are being  acquired for  investment for Seller's own account,
not as a nominee or agent,  and not with a view to the resale or distribution of
any part thereof, and that Seller has no present intention of selling,  granting
any  participation  in,  or  otherwise  distributing  the same.  Except  for the
December 29 Agreement,  by executing this Agreement,  Seller further  represents
that Seller does not have any contract,  undertaking,  agreement or  arrangement
with any person to sell,  transfer or grant  participations to such person or to
any third person, with respect to any Shares.  Notwithstanding the foregoing, it
is  understood  that (i) Seller may transfer the Shares to the  shareholders  of
Seller,   (ii)  any  shareholder  of  Seller  may  transfer  Shares  to  another
shareholder of Seller,  and (iii) a shareholder of Seller may transfer Shares to
existing shareholders of Buyer who, on the date of this Agreement,  beneficially
own more than five percent  (5%) of the  outstanding  Shares of Buyer,  provided
that in each of the above instances the transferee  agrees to be bound by all of
the provisions of this Agreement relating to the Shares and executes appropriate
investment  representations  in order to comply with any  applicable  federal or
state securities laws.

       6.15 Disclosure of  Information.  Seller believes it has received all the
information  it considers  necessary  or  appropriate  for  deciding  whether to
acquire the Shares.  Seller further represents that it has had an opportunity to
ask questions and receive  answers from Buyer regarding the terms and conditions
of the  offering  of the  Shares and the  business,  properties,  prospects  and
financial condition of Buyer.

                                       13

<PAGE>


       6.16 Investment  Experience.  Seller acknowledges that it is able to fend
for itself, can bear the economic risk of its investment, and has such knowledge
and experience in financial or business matters that it is capable of evaluating
the merits and risks of the investment in the Shares.  Seller also represents it
has not been organized for the purpose of acquiring the Shares.

       6.17  Restricted  Securities.  Seller  understands  that the Shares it is
acquiring is  characterized as "restricted  securities"  under the United States
federal  securities  laws  inasmuch  as  the  Shares  are  being  acquired  in a
transaction  not  involving  a public  offering  and that  under  such  laws and
applicable  regulations  the Shares may be resold in the United  States  without
registration  under  the Act  only in  certain  limited  circumstances.  In this
connection,  Seller  represents  that it is familiar  with Rule 144  promulgated
under the Act, as presently in effect,  and understands  the resale  limitations
imposed thereby and by the Act.

       6.18 Further Limitations on Disposition.  Without in any way limiting the
representations  set  forth  above,  Seller  further  agrees  not  to  make  any
disposition of all or any portion of the Shares unless:

                  (a) There is then in effect a Registration Statement under the
Act  covering  such  proposed  disposition  and  such  disposition  is  made  in
accordance with such Registration Statement; or

                  (b) (i)  Seller  shall  have  notified  Buyer of the  proposed
disposition  and shall have  furnished  Buyer with a detailed  statement  of the
circumstances  surrounding  the  proposed  disposition,  and (ii) if  reasonably
requested  by Buyer,  Seller  shall  have  furnished  Buyer  with an  opinion of
counsel, reasonably satisfactory to Buyer that such disposition will not require
registration  of such  shares  under the Act.  It is agreed  that Buyer will not
require opinions of counsel for transactions made pursuant to Rule 144 except in
unusual circumstances.

       6.19 Legends.  Seller  understands  and agrees that the legends set forth
below or similar legends will be placed on any Shares certificate(s)  evidencing
the Shares,  together  with any other legends that may be required by applicable
securities laws or Buyer' charter documents:

                  (a) "THE SECURITIES  REPRESENTED BY THIS  CERTIFICATE HAVE NOT
BEEN  REGISTERED  UNDER THE ACT OF 1933,  AS AMENDED (THE  "ACT"),  OR UNDER THE
SECURITIES LAWS OF CERTAIN STATES. THE SECURITIES ARE SUBJECT TO RESTRICTIONS ON
TRANSFERABILITY  AND  RESALE  AND MAY NOT BE  TRANSFERRED  OR  RESOLD  EXCEPT AS
PERMITTED  UNDER THE ACT AND  APPLICABLE  STATE  SECURITIES  LAWS,  PURSUANT  TO
REGISTRATION OR EXEMPTION THEREFROM. THE ISSUER OF THE SECURITIES MAY REQUIRE AN
OPINION  OF  COUNSEL  IN FORM AND  SUBSTANCE  SATISFACTORY  TO THE ISSUER TO THE
EFFECT THAT ANY PROPOSED  TRANSFER OR RESALE IS IN  COMPLIANCE  WITH THE ACT AND
ANY APPLICABLE STATE SECURITIES LAWS."

                  (b)  "THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  ARE
SUBJECT  TO  CERTAIN  RESTRICTIONS  ON RESALE  AND  TRANSFER  AS SET FORTH IN AN
AGREEMENT   BETWEEN  THE  ISSUER  AND  THE  INITIAL  HOLDER  OF  THE

                                       14

<PAGE>


SECURITIES  REPRESENTED HEREBY, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
OFFICE OF THE ISSUER."

                  Buyer  agrees  that  it  will  remove  the  above  legends  in
connection with sales of Shares pursuant to a Shelf Registration  Statement,  as
described  further in Section  10.2 below and, in any case,  at such time as the
Shares  represented  by any  certificate  can be publicly  sold  without  volume
restriction within a three-month period pursuant to Rule 144.

       6.20 Refusal to Transfer.  Seller acknowledges and agrees that Buyer will
not be  required  (i) to transfer on its books any Shares that have been sold or
otherwise transferred in violation of any of the provisions of this Agreement or
(ii) to treat as owner of such  Shares,  or to  accord  the right to vote or pay
dividends to, any other transferee to whom such Shares have been so transferred.

7.       COVENANTS OF SELLER

         Seller covenants and agrees with Buyer as follows:

         7.1 Access to  Information.  Seller will  provide all  information  and
supporting  documents  concerning the Acquired Assets and Seller's business that
Buyer requests to investigate the Acquired Assets or the Seller's business or to
carry into effect this Agreement,  and will afford Buyer or its  representatives
access to Seller's properties,  offices and files, upon reasonable prior notice,
whether before or after the Closing.  Seller will confer with representatives of
Buyer and will  furnish  to Buyer,  either  orally or by means of such  records,
documents,  and memoranda as are available or reasonably capable of preparation,
such  information  as Buyer may reasonably  request,  and Seller will furnish to
Buyer's auditors all consents and authority that they may reasonably  request in
connection with any examination of Buyer.

         7.2  Acquired  Assets.  Seller will use its best efforts to protect the
Acquired  Assets,  cooperate with Buyer  concerning  protection of  intellectual
property  rights  relating to the Acquired Assets and take such actions as Buyer
may  reasonably  request (at Buyer's  expense)  relating to  protection  of such
assets, and effect no transfer, sale, assignment,  lease, license or encumbrance
of or on any of its Acquired Assets.

         7.3 No Inconsistent Transactions.  Before the Closing, Seller shall not
engage  in  any  transaction  that  is  materially  inconsistent  with  Seller's
representations and warranties made in this Agreement.

         7.4 Intellectual Property.  Upon the Closing, Seller will cease any use
of any of the Acquired Assets without Buyer's prior written consent.

         7.5 Consent of Third Parties.  Prior to the Closing Date,  Seller shall
obtain  the  consent in writing of all  persons  necessary  to permit  Seller to
assign and transfer all of the Acquired  Assets to Buyer,  free and clear of all
Encumbrances  and  to  perform  its  obligations  under,  and  to  conclude  the
transactions contemplated by, this Agreement.

         7.6 Further Assurances. Seller will provide to Buyer, whether before or
after the  Closing,  any further  documents  that Buyer  reasonably  requests to
investigate  the  Acquired

                                       15

<PAGE>


Assets or the  business  of  Seller or to carry  into  effect  the  transactions
contemplated  by this  Agreement.  Seller shall promptly  execute and deliver to
Buyer any and all such further assignments,  endorsements and other documents as
Buyer may  reasonably  request  for the  purpose of  effecting  the  transfer of
Seller's  title  to the  Acquired  Assets  to  Buyer  and/or  carrying  out  the
provisions   of  this   Agreement.   Seller   hereby   appoints   Buyer  as  its
attorney-in-fact   for  the  limited  purpose  of  executing  such  assignments,
endorsements  and other documents should Seller be unable or unwilling to do so.
After the Closing,  Seller and its employees  shall cooperate in good faith with
Buyer and take such actions and execute such instruments as Buyer may reasonably
request  for the  purpose  of  preparing,  prosecuting,  securing,  maintaining,
enforcing  and  defending  patents  and  patent  applications,   trademarks  and
trademark applications,  copyright and copyright applications,  or other similar
intellectual property filings.

         7.8 Taxes.  Seller agrees to promptly pay all sales, use or other taxes
imposed on the sale of the Acquired Assets to Buyer under this Agreement  (other
than capital gain or income taxes imposed on individual shareholders of Seller).
Seller agrees to defend,  indemnify and hold Buyer harmless from and against any
such taxes or claims for payment thereof by any tax authority.

         7.9  Clinical  Consultant.  Seller  will  provide  the  services of Dr.
Stephen  Gorfine,  an  employee  of Seller,  to act in the  capacity of Clinical
Consultant  to Buyer,  pursuant  to the terms of a  consulting  agreement  to be
entered into between Dr. Gorfine and Buyer.

         7.10 Litigation. Seller shall notify Buyer promptly upon receipt of any
communication or legal process which commences or threatens  litigation  against
Seller,  its business,  or which might adversely  affect the value of any of the
Acquired Assets.

         7.11  Securities.  Seller and any of its  shareholders  who receive any
Shares, agree to the same lock-up restrictions  contained in the form of lock-up
agreement  executed  by  Buyer's  directors  in  connection  with  the  Form S-1
Registration Statement,  file No. 333-38179,  and the provisions of such lock-up
agreements  are hereby  incorporated  by reference  and shall be  applicable  to
Seller  and its  shareholders.  Any person or entity who  acquires  Shares  from
Seller  shall  execute  an  agreement  agreeing  to be  bound  by  such  lock-up
restrictions.  The foregoing lock-up restrictions shall not apply, however, to a
private  resale of such  Shares to a person  who  agrees in  writing  to be such
lock-up restrictions.

         7.12 No Negotiations. Seller agrees that until December 31, 1997 or the
earlier mutual abandonment of the transaction  contemplated hereby,  Seller will
not, and will not allow any officer or director of Seller or any other person on
its  behalf,  to  negotiate  or accept any offer from any party  concerning  the
possible  disposition  of all or any  substantial  portion of  Seller's  assets,
equity or business.  Seller will promptly  notify Buyer of any such inquiries or
proposals.

         7.13 Conduct of  Business.  From the date of this  Agreement  until the
Closing,  Seller will  preserve and operate its business in the ordinary  course
and will not enter into any  transaction  or agreement or take any action out of
the  ordinary  course  or enter  into  any  transaction  or make any  commitment
involving an expense or capital  expenditure by Seller  relating to the Acquired
Assets, in excess of $5,000, without Buyer's prior written consent.

                                       16

<PAGE>


         7.14  Other.  Seller  shall use its best  efforts  after the Closing to
cause its counsel to deliver to Buyer, on or before January 12, 1998, an opinion
of Seller's counsel  addressing the following matters:  due organization,  valid
existence  and good  standing;  corporate  power  and  authority;  due and valid
authorization of this Agreement and the other instruments executed by Seller and
delivered at the Closing (the "Seller Ancillary  Documents");  enforceability of
this  Agreement  and the Seller  Ancillary  Documents;  absence of  conflict  or
material  violation  of  laws  or  Seller's  charter  documents  resulting  from
execution,  delivery and performance of this Agreement and the Seller  Ancillary
Documents;  and the absence of required  consents or other  approvals or filings
with any governmental agency or authority.

8.       COVENANTS OF BUYER

         Buyer covenants and agrees with Seller as follows:

         8.1  Conduct of  Business.  Buyer shall use all  reasonable  efforts to
conduct its business in such a manner so as to not be in material  breach of the
representations and warranties made to Seller herein.

         8.2  Litigation.  Buyer will notify Seller promptly upon receipt of any
communication or legal process which commences or threatens  litigation relating
to the Acquired Assets or the transactions  contemplated hereby for which Seller
may be required to indemnify Buyer.

         8.3  Commercially  Reasonable  Efforts  After  the  Closing.  After the
Closing, Buyer will undertake  commercially  reasonable efforts for a product of
similar  commercial  potential as the Acquired  Assets,  consistent with Buyer's
other  business  opportunities,  financial  condition,  prospects and commercial
business  judgment,  to develop  and  commercialize  the  Acquired  Product in a
reasonably  timely  manner.  The foregoing  shall not require Buyer to undertake
development  or  commercialization   efforts  that  are  inconsistent  with  the
foregoing  standard.  If Seller  believes  that  Buyer is not so  developing  or
commercializing the Acquired Product, it may notify Buyer, and the parties shall
promptly meet and confer  regarding  Buyer's  development and  commercialization
efforts.  If after such meeting Seller continues to believe that Buyer is not so
developing or

commercializing the Acquired Product, it may initiate  arbitration  proceedings,
in the manner provided herein, regarding Buyer's efforts.

         8.4 Other.  Buyer shall use its best efforts after the Closing to cause
its counsel to deliver to Seller,  on or before  January 12, 1998, an opinion of
Buyer's  counsel  addressing  the following  matters:  due  organization,  valid
existence  and good  standing;  corporate  power  and  authority;  due and valid
authorization of this Agreement and the other instruments  executed by Buyer and
delivered at the Closing (the "Buyer Ancillary  Documents");  due authorization,
valid  issuance  and  nonassessability  of the  Shares;  enforceability  of this
Agreement  and the Buyer  Ancillary  Documents;  absence of conflict or material
violation  of  laws or  Buyer's  charter  documents  resulting  from  execution,
delivery and  performance of this Agreement and the Buyer  Ancillary  Documents;
and the absence of  required  consents or other  approvals  or filings  with any
governmental agency or authority.

9.       CONDITIONS TO CLOSING

                                       17

<PAGE>


         9.1  Conditions  to  Buyer's  Obligations.  The  obligations  of  Buyer
hereunder  shall be subject to the  satisfaction  and fulfillment of each of the
following conditions, except as Buyer may expressly waive the same in writing:

                  (a)  Due   Diligence.   Buyer   shall  have   completed   such
investigation  of the  Acquired  Assets  and of  Seller's  business  as it deems
appropriate  and  shall be  satisfied  with its due  diligence,  including  with
respect to Seller's ownership of its intellectual  property and any other matter
affecting Buyer's ownership of the Acquired Assets or liabilities or obligations
with respect to the Acquired Assets.

                  (b) No Material  Adverse Change.  Since the date of the Letter
of Intent,  there shall have been no material adverse change shall have occurred
in Seller's business or in the Acquired Assets.

                  (c)  Proceeding   Satisfactory.   All  actions,   proceedings,
instruments  and  documents  required  by Seller  to carry out the  transactions
contemplated  by this  Agreement and all other  related  matters shall have been
completed to the reasonable satisfaction of Buyer's counsel.

                  (d)  Accuracy of  Representations  and  Warranties  on Closing
Date. The representations and warranties made herein by Seller shall be true and
correct in all material  respects on and as of the date given,  and on and as of
the Closing  Date with the same force and effect as though such  representations
and warranties were made on and as of the Closing Date.

                  (e)  Compliance.  Seller  shall have  complied in all material
respects  with,  and shall have fully  performed in all material  respects,  all
conditions,  covenants and  obligations of this  Agreement  imposed on Seller or
required to be  performed  or  complied  with by Seller at or before the Closing
Date.

                  (f) Delivery of Assets. Seller shall have delivered, and Buyer
shall have received, all the Acquired Assets free and clear of all Encumbrances.

                  (g)  Assignments.  Seller shall have  executed and Buyer shall
have  received  Assignment  Agreements  for  all  patent,  trademark  and  other
intellectual  property rights relevant to the Acquired Assets,  in substantially
the form attached.

                  (h) Seller's  Consents  Obtained.  All consents required to be
obtained by Seller pursuant to Section 7.5 herein shall have been obtained.

                  (i) Litigation.  No communication  action, claim or proceeding
shall have been  brought or  threatened  by any party  seeking to  challenge  or
prohibit  the  transactions  contemplated  herein or  claiming  any rights to or
affecting Seller's or Buyer's rights in any of the Acquired Assets.

                  (j) [Reserved].

                  (k) Consulting Agreement.  Dr. Gorfine shall have entered into
a consulting  agreement  with Buyer in  substantially  the form attached to this
Agreement.

                                       18

<PAGE>


         9.2  Conditions  to Seller's  Obligations.  The  obligations  of Seller
hereunder  shall be subject to the  satisfaction  and fulfillment of each of the
following conditions, except as Seller may expressly waive the same in writing:

                  (a)  Accuracy of  Representations  and  Warranties  on Closing
Date.  The  representations  and  warranties  made  herein by Buyer in Section 5
hereof shall be true and correct in all material  respects on and as of the date
given,  and on and as of the  Closing  Date with the same  force  and  effect as
though such  representations  and warranties  were made on and as of the Closing
Date.

                  (b)  Compliance.  Buyer shall have  complied  in all  respects
with,  and  be  shall  have  fully  performed  in  all  material  respects,  all
conditions,  covenants and  obligations  of this  Agreement  imposed on Buyer or
required  to be  performed  or  complied  with by Buyer at or before the Closing
Date.

                  (c) Purchase Price.  Buyer shall have delivered 429,752 Shares
to Seller with a fair market value representing the negotiated purchase price of
the Acquired Assets, to Seller or Seller's agent(s).

                  (d) No Material Adverse Change.  There shall not have been any
material  adverse change in Buyer's  business from the date of this Agreement to
the Closing Date  (provided,  however,  that neither a claim  brought by a third
party  related to the  Acquired  Assets,  nor a decline  in the market  price of
Buyer's  Common  Stock,  shall,  in and of itself,  be deemed to be a materially
adverse change in Buyer's business).

10.      REGISTRATION RIGHTS

         10.1 Definitions. For purposes of this Agreement:

                  (a) Act. The term "Act" means the Act of 1933, as amended.

                  (b) Form S-3.  The term  "Form  S-3" means such form under the
Act as is in effect on the date hereof or any successor  registration form under
the Act  subsequently  adopted by the  Commission  which  permits  inclusion  or
incorporation  of substantial  information by reference to other documents filed
by the Company with the Commission.

                  (c) Company. The term "Company" means the Buyer.

                  (d)  Holder.   The  term  "Holders"   means  Seller  and  such
shareholders  of Seller to whom shares of Common  Stock  issued to Seller  under
this  Agreement may be transferred  and any permitted  successor,  assignee,  or
transferee thereof.

                  (e)  Registration.  The terms  "register,"  "registered,"  and
"registration"  refer to a  registration  effected  by  preparing  and  filing a
registration  statement  in  compliance  with the Act,  and the  declaration  or
ordering of effectiveness of such registration statement.

                  (f) Registrable Securities.  The term "Registrable Securities"
means: (1) all of the Shares,  and (2) any shares of Common Stock of the Company
issued as a dividend or other  distribution  with respect to, or in exchange for
or in  replacement  of,  any of the  Shares;  provided,

                                       19

<PAGE>


however, that the term "Registrable Securities" shall exclude in all events (and
such  securities  shall  not  constitute   "Registrable   Securities")  (i)  any
Registrable  Securities sold or transferred to a person to a person who is not a
Holder  as  defined  above,  (ii) any  Registrable  Securities  sold in a public
offering pursuant to a registration  statement filed with the Commission or sold
pursuant to Rule 144  promulgated  under the Act ("Rule 144") or (iii) as to any
Holder,  the  Registrable  Securities  held  by  such  Holder  if  all  of  such
Registrable  Securities can be publicly sold without volume restriction within a
three-month period pursuant to Rule 144.

                  (g)  Prospectus:   The  term   "Prospectus"   shall  mean  the
prospectus  included in any Shelf  Registration  Statement  (including,  without
limitation,  a prospectus that discloses  information  previously omitted from a
prospectus filed as part of an effective registration statement in reliance upon
Rule  430A  promulgated  under the  Act),  as  amended  or  supplemented  by any
prospectus supplement (including,  without limitation, any prospectus supplement
with  respect to the terms of the  offering  of any  portion of the  Registrable
Securities  covered  by  such  Shelf  Registration  Statement),  and  all  other
amendments  and   supplements  to  the  Prospectus,   including   post-effective
amendments,  and  all  material  incorporated  by  reference  or  deemed  to  be
incorporated by reference in such Prospectus.

                  (h)      Shelf Registration Statement.  See Section 10.2(a).

         10.2 Form S-3 Shelf Registration.

                  (a) Registration.  The Company shall prepare and file with the
Commission a registration  statement on Form S-3 (or, if the Company is not then
eligible to use Form S-3,  then  another  appropriate  form)  providing  for the
resale by the Holders of all of the Registrable  Securities  (such  registration
statement and any additional  registration statements that may be filed pursuant
to the next sentence,  referred to as the "Shelf  Registration  Statement").  If
additional Shares are issued after the Closing, then such Shares shall either be
included in the initial  Shelf  Registration  Statement,  or shall be registered
under a new  Shelf  Registration  Statement  filed  by the  Company.  The  Shelf
Registration  Statement may include securities other than those held by Holders.
The  Company  will  use all  reasonable  efforts  to  cause  the  initial  Shelf
Registration Statement to become effective before February 19, 1998. The Company
shall use its best efforts to keep the Shelf Registration Statement continuously
effective,  pursuant  to the Act  and  the  Rules  and  Regulations  promulgated
thereunder,  until (i) the date when such  Registrable  Securities cease to meet
the  above  definition  of  Registrable  Securities,  (ii)  if all  Registerable
Securities have been registered and sold, or (iii) two years after the effective
date of such Shelf  Registration  Statement  (or, if Shares are issued after the
Closing and a new Shelf Registration  Statement is filed by the Company covering
such Shares,  then two years after the date such Shares are issued;  or, if such
additional Shares are included in the initial Shelf Registration Statement, then
two years after the date such Shares are issued); provided, however:

                  (i) that the  Holders  will  sell the  Registrable  Securities
pursuant  to such  registration  only  during a  "Permitted  Window" (as defined
below);

                  (ii) if a "Notice  of  Resale"  (as  defined  below)  has been
given, then if the Company furnishes to the Holders a certificate  signed by the
President or Chief  Executive  Officer of the Company  stating that, in the good
faith  judgment of the Board of Directors of the Company,  it would be seriously
detrimental  to the Company and its  shareholders  for the

                                       20

<PAGE>


Permitted  Window  to  commence  at such  time)  due to (A) the  existence  of a
material  development or potential  material  development  involving the Company
which the Company would be obligated to disclose in the Prospectus  contained in
the Shelf  Registration  Statement,  which  disclosure  would in the good  faith
judgment of the Board of  Directors  of the Company be  premature  or  otherwise
inadvisable at such time or (B) concurrent public filings with the Commission of
other  registration  statements,  then the  Company  will  have the  right  (the
"Deferral Right") to defer the commencement of the Permitted Window for a period
of not more  than 30 days  after  receipt  of the  Notice of  Resale;  provided,
however,  that the Company will not utilize the Deferral Right more than once in
any twelve month period; and

                  (iii) that the Company will not be required to effect any such
registration,  qualification  or compliance under applicable state blue sky laws
in any particular jurisdiction in which the Company would thereby be required to
qualify to do business or to execute a general consent to service of process.

                  In the event that the Shelf Registration Statement shall cease
to be effective,  the Company shall promptly prepare and file a new registration
statement covering the Registrable  Securities and shall use its best efforts to
have such registration  statement  declared  effective as soon as possible.  Any
such registration statement shall be considered a "Shelf Registration Statement"
hereunder.

                  (b) Permitted  Window.For  the purposes of this  Agreement,  a
"Permitted  Window"  with  respect  to a Holder  is a period  of 60  consecutive
calendar days  commencing  upon delivery to the Holder of the Company's  written
notification to the Holder in response to a Notice of Resale that the Prospectus
contained in the Shelf Registration  Statement is available for resale. In order
to cause a Permitted Window to commence, a Holder must first give written notice
to the Company of its present  intention to sell part or all of the  Registrable
Securities pursuant to such registration (a "Notice of Resale"). Upon receipt of
such Notice of Resale,  the Company will give  written  notice to the Holders as
soon as  practicable,  but in no event not more than three  business  days after
such  receipt,  that (A) the  Permitted  Window  will  commence on the date such
notice is  received  by the  Holder,  (B) it is  necessary  for the  Company  to
supplement the  Prospectus or make an appropriate  filing under the Exchange Act
so as to cause the  Prospectus to become  current  (unless a certificate  of the
President or Chief Executive  Officer is delivered as provided in above), or (C)
the Company is required under the Act and the Rules and  Regulations  thereunder
to amend the Shelf Registration Statement in order to cause the Prospectus to be
current  (unless a certificate  of the President or Chief  Executive  Officer is
delivered as provided in above). If the Company  determines that a supplement to
the  Prospectus,  the  filing of a report  pursuant  to the  Exchange  Act or an
amendment  to the  Shelf  Registration  Statement  required  under  the Act,  as
provided  above,  is necessary,  it will take such actions as soon as reasonably
practicable  (subject to paragraph  (c) below),  and the Company will notify the
Holder of the filing of such supplement,  report or amendment,  and, in the case
of an amendment,  the effectiveness  thereof, and the Permitted Window will then
commence.  Within three business days after the Company has received a Notice of
Resale together with the original stock certificate representing the Registrable
Securities to which the Notice of Resale  relates and  instructions  executed by
the Holder  concerning  cancellation of such certificate and reissuance of a new
certificate,  the  Company  shall  cause  its  transfer  agent  to  issue  a new
certificate for the Registrable  Securities to be sold pursuant to the Notice of
Resale without the legends set forth in Section 6.19 above.

                                       21

<PAGE>


                  (c) Closing of Permitted Window. During a Permitted Window and
in the event (i) of the  happening of any event of the kind  described  above or
(ii) that, in the judgment of the Company's Board of Directors,  it is advisable
to  suspend  use  of  the  Prospectus  for a  discrete  period  of  time  due to
undisclosed  pending  corporate  developments or pending public filings with the
Commission (which need not be described in detail),  the Company shall deliver a
certificate  in writing to the Holder to the effect of the  foregoing  and, upon
receipt of such certificate, the Permitted Window shall terminate. The Permitted
Window shall resume upon the Holder's  receipt of copies of the  supplemented or
amended  Prospectus,  or at such time as the Holder is advised in writing by the
Company  that the  Prospectus  may be used,  and at such time as the  Holder has
received copies of any additional or supplemental  filings that are incorporated
or deemed incorporated by reference in such Prospectus and which are required to
be delivered as part of the Prospectus. In any event, the Permitted Window shall
resume  no later  than 30 days  after it has been  terminated  pursuant  to this
Section,  and if the  Permitted  Window has been  closed,  then once resumed the
number of days during which such Permitted Window remains open shall be extended
by the number of days that the Permitted  Window was closed.  If the Company has
previously  terminated a Permitted Window pursuant to this subsection  within 90
days of the date  that it  delivers  another  notice  pursuant  this  subsection
terminating  another  Permitted  Window,  then the time  period set forth in the
preceding  sentence shall be shortened so that the Permitted Window shall resume
no later  than 10 days  after it has been  terminated  pursuant  to such  second
notice.

                  (d) Expenses.  The registration  fees and expenses incurred by
the Company in  connection  with each Shelf  Registration  Statement and actions
taken by the Company in connection with each Permitted  Window shall be borne by
the  Company.  Holder  shall be  responsible  for any fees and  expenses  of its
counsel or other  advisers;  provided,  however,  that the Company shall pay the
incremental  fees and  expenses,  if any,  reasonably  incurred by Holder  (upon
submission  of  appropriate  documentation)  directly  caused  by the  Company's
exercise  of a Deferral  Right or the  closing  of a  Permitted  Window.  Before
incurring any such  expenses,  Holder shall give prior notice to the Company and
describe  the fees and  expenses  that it  proposes  to incur  for  which it may
request reimbursement pursuant to the preceding sentence.

         10.3  Obligations  of the  Company.  Whenever  required  to effect  the
registration of any  Registrable  Securities  under this Agreement,  the Company
shall, as expeditiously as reasonably possible:

                  (a)  Furnish  to  the  Holder  such  number  of  copies  of  a
Prospectus,   including  a  preliminary  Prospectus,   in  conformity  with  the
requirements of the Act, and such other  documents as it may reasonably  request
in order to facilitate the disposition of the Registrable Securities owned by it
that are included in such registration.

                  (b) Use all  reasonable  efforts to  register  and qualify the
securities covered by such registration statement under such other securities or
Blue Sky laws of such  jurisdictions  as shall be  reasonably  requested  by the
Holder,  provided that the Company shall not be required in connection therewith
or as a condition thereto to qualify to do business or to file a general consent
to service of process in any such states or jurisdictions.

                  (c)  Notify  the  Holder  promptly  (i) of any  request by the
Commission  or any other  federal  or state  governmental  authority  during the
period  of  effectiveness   of  a  registration

                                       22

<PAGE>


statement  for  amendments  or  supplements  to such  registration  statement or
related  prospectus or for additional  information,  (ii) of the issuance by the
Commission  or any other  federal or state  governmental  authority  of any stop
order suspending the effectiveness of a registration statement or the initiation
of any  proceedings  for that purpose and (iii) of the receipt by the Company of
any  notification  with  respect  to  the  suspension  of the  qualification  or
exemption from  qualification  of any of the Registrable  Securities for sale in
any  jurisdiction  or the  initiation or  threatening of any proceeding for such
purpose.

                  (d) Make every  reasonable  effort to obtain the withdrawal of
any order suspending the  effectiveness of the Shelf  Registration  Statement at
the earliest possible time.

                  (e)  Use  all  reasonable  efforts  to  list  the  Registrable
Securities  for trading on Nasdaq or other stock exchange on which the Company's
Common Stock is then traded.

         10.4  Furnish  Information.  It shall be a condition  precedent  to the
obligations  of the  Company to take any action  pursuant to Section 10 that the
Holder  shall  furnish  to  the  Company  such  information  regarding  it,  the
Registrable  Securities  held by it, and the intended  method of  disposition of
such  securities as shall be required to timely effect the  registration  of its
Registrable Securities.

         10.5  Termination  of Buyer's  Obligations.  The Company  shall have no
obligations  to  register,  or  maintain,  a  registration  statement  governing
Registrable  Securities,  (i) if all Registrable Securities have been registered
and sold pursuant to  registrations  effected  pursuant to this Agreement,  (ii)
with  respect  to any  particular  Holder,  at  such  time  as  all  Registrable
Securities  held by such Holder may be sold within a three  month  period  under
Rule 144, as it may be amended from time to time,  including  but not limited to
amendments  that reduce that period of time that  securities must be held before
such  securities  may be sold  pursuant to such rule or (iii) two years from the
effective date of the Shelf  Registration  Statement (or, with respect to Shares
that are  issued  after the  Closing  two years  after the date such  Shares are
included in a Shelf Registration Statement).

11.      SURVIVAL OF WARRANTIES AND INDEMNIFICATION

         11.1 Survival of Warranties. All representations and warranties made by
Seller or Buyer herein,  or in any  certificate,  schedule or exhibit  delivered
pursuant hereto, shall survive the Closing.

         11.2  Indemnification  by  Seller.  Seller and its  shareholders  shall
jointly  and  severally  indemnify  and  hold  harmless  Buyer,  its  directors,
officers,  shareholders,  employees  and agents  from and against any Loss which
arises out of or results from:

                  (a) any breach of any covenant of Seller, or the inaccuracy or
untruth of any representation or warranty of Seller, made herein;

                  (b) any taxes,  assessments and other governmental  charges of
any kind or nature  whatsoever,  including  without  limitation any withholding,
social security or

                                       23

<PAGE>


unemployment  levies,  arising  out of, or payable  with  respect  to,  Seller's
business operations through the Closing Date;

                  (c) any claim arising out of or based on any act,  omission of
Seller or its  directors,  officers or  employees  or  circumstance  relating to
Seller's business arising before the Closing Date;

                  (d) any claim of infringement or violation of the intellectual
property  rights of a third  party or  failure  of Seller to be the owner of the
intellectual  property included in the Acquired Assets or otherwise to have good
title or valid rights to the Acquired Assets;

                  (e) any claim or cause of action alleging liability related to
any past  agreement with any of Seller's  employees or independent  contractors,
any  agreement  between  Seller and any third  party  relating  to the  Acquired
Assets,  or any claim by a third party arising out of or relating to the matters
set forth in the Disclosure Letter;

                  (f) any claim or cause of action by or on behalf of a creditor
of Seller  asserting  liability  against  Buyer,  as  purchaser  of the Acquired
Assets,  or seeking to impose any lien or any other  encumbrance upon any of the
Acquired Assets, for obligations of Seller;

                  (g)  any  Loss  arising  out  of or  relating  to  any  pilot,
pre-clinical,  clinical or other studies or trials or other use by any person of
the Acquired  Assets  authorized  by or  conducted  by, for or at the request of
Seller relating to any of the Acquired Assets; and

                  (h) any expenses in excess of Five Thousand  Dollars  ($5,000)
that are incurred by Buyer to obtain  consents of third parties to assignment of
or transfer the Acquired Assets.

         The indemnity obligations of the Seller's shareholders  hereunder shall
in no event exceed the amounts paid to Seller hereunder (with respect to shares,
valued  based on the market  price on the date  received  by  Seller),  plus any
amounts that may be withheld pursuant Section 11.4.

         11.3  Indemnification by Buyer. Buyer shall indemnify and hold harmless
Seller,  its directors,  officers,  shareholders,  employees and agents from and
against any Loss which arises out of or results from:

                  (a) any breach of a covenant of Buyer,  or the  inaccuracy  or
untruth of any representation or warranty of Buyer, made herein;

                  (b) any claim against Seller or its  shareholders  relating to
the  Acquired  Assets  and  based  solely on acts or  omissions  of Buyer or its
directors, officers or employees after the Closing Date relating to the Acquired
Assets; and

                  (c) any action against Seller or its shareholders  relating to
sale of Shares by such person pursuant to the Shelf  Registration  Statement and
based  upon any  untrue  statement  of a material  fact  contained  in any Shelf
Registration  Statement or the omission to state in any such Shelf  Registration
Statement a material fact required to be stated therein or necessary to make the
statements therein not misleading;  provided,  however,  that Buyer shall not be
liable in any such case for any such Loss to the extent that it arises out of or
is based upon a statement or omission

                                       24

<PAGE>


which  occurs in  reliance  upon  information  furnished  by Seller or any other
Holder; and provided further,  that Buyer shall not be liable for the legal fees
and  expenses of more than one  counsel to all  indemnified  parties  under this
Section 11.3.

         11.4  Procedures for  Indemnification.  Buyer may recover the amount of
any Loss from the portion of the purchase price that is withheld or from amounts
otherwise  payable  after  the  Closing  pursuant  to  the  provisions  of  this
Agreement.   If  an   indemnified   party   intends   to   assert  a  claim  for
indemnification,  it must first notify the indemnifying  parties in writing.  No
claim for  indemnification  may,  however,  be paid until the  aggregate of such
claims exceeds  $20,000.  If the  indemnifying  parties dispute the claim,  they
shall  deliver a notice of dispute  within thirty (30) days of the date on which
the notice of Loss was  delivered,  and the dispute shall be resolved by binding
arbitration in San Francisco,  California under the Commercial Arbitration Rules
of the American Arbitration Association as provided below in this Agreement.

       11.5  Further  Procedures  for  Indemnification.  If any action,  suit or
proceeding  shall be commenced by a third party against,  or any claim or demand
be asserted by a third party  against,  Seller or Buyer,  as the case may be, in
respect of which  Seller or Buyer is  entitled to demand  indemnification  under
this  Section 11,  then as a  condition  precedent  thereto,  the party  seeking
indemnification   ("Indemnitee")   shall   promptly   notify  the  other   party
("Indemnitor") in writing to that effect and with reasonable particularity.  The
Indemnitor shall have the right to assume the control of the defense, compromise
or settlement of such action, suit, proceeding or claim, including the selection
of counsel,  subject to the right of the Indemnitee to  participate  (at its own
expense and with counsel of its choice) in the defense, compromise or settlement
of such action, suit,  proceeding,  claim or demand, and in connection therewith
the Indemnitee  shall cooperate fully in all respects with the Indemnitor in any
such defense,  compromise or settlement.  The Indemnitor  will not compromise or
settle any such  action,  suit,  proceeding,  claim or demand  without the prior
written  consent  of the  Indemnitee,  which  consent  will not be  unreasonably
withheld or delayed.  So long as the  Indemnitor  is defending in good faith any
such action, suit, proceeding, claim or demand asserted by a third party against
the Indemnitee, the Indemnitee shall not settle or compromise such action, suit,
proceeding, claim or demand without the prior written consent of the Indemnitor,
which consent will not be unreasonably withheld or delayed. The Indemnitee shall
make available to the  Indemnitor or its agents all records and other  materials
in the  Indemnitee's  possession  reasonably  required for  contesting any third
party claim or demand.  If the Indemnitor  shall fail to promptly and adequately
defend any such action,  suit,  proceeding,  claim or demand,  or if there is an
inherent  conflict  between the legal or factual  positions  of  Indemnitor  and
Indemnitee, then the Indemnitee may defend, through counsel of its own choosing,
such action, suit, proceeding,  claim or demand and (so long as Indemnitee gives
the  Indemnitor  at least ten (10)  days'  notice  of the terms of the  proposed
settlement  thereof and permits the  Indemnitor  to then  undertake  the defense
thereof if Indemnitor objects to the proposed settlement) to settle such action,
suit, proceeding,  claim or demand and to recover from the Indemnitor the amount
of such Losses.  If Buyer is the Indemnitee,  then in addition to exercising any
other  rights or  remedies  Buyer may have  under this  Agreement,  at law or in
equity,  Buyer shall have the right,  at any time,  at Buyer's sole option after
Buyer gives Seller  written  notice of Buyer's intent to do so, to offset and/or
withhold  all or any part of any  amounts  payable by Buyer to Seller that Buyer
considers  necessary to satisfy any claim of which Buyer  becomes aware prior to
the  date  such  payments  are  made  and for  which  Buyer  is  entitled  to be
indemnified hereunder.

                                       25

<PAGE>


12.      MISCELLANEOUS

         12.1  Expenses.  Each Party shall be  responsible  for its own fees and
expenses  (including without limitation  attorneys' fees) in connection with the
negotiation and consummation of the transaction contemplated hereby.

         12.2 Notices.  Any notice  required or permitted to be given under this
Agreement shall be in writing and shall be given by means of personal  delivery,
telecopier,  certified or registered United States mail, postage prepaid,  or by
nationally recognized overnight service courier and addressed as follows:

                  (a)      If to Seller:

                           Neptune Pharmaceutical Corporation
                           25 East 69th Street
                           New York, NY  10021
                           Attention: President

                  (b)      If to Buyer:

                           Cellegy Pharmaceuticals, Inc.
                           1065 East Hillsdale Boulevard, Suite 418
                           Foster City, CA  94404
                           Attention: President

Notices shall be deemed given (i) upon delivery if  personally  delivered,  (ii)
one business day after transmission by telecopier, with confirmation of receipt,
(iii) three  business  days after deposit in the United States mail, or (iv) one
business  day after  deposit  with a  nationally  recognized  overnight  courier
service.  Any party may change its address for delivery of notices by means of a
notice delivered to the other party.

         12.3 Captions.  The captions in this Agreement are for convenience only
and  shall  not  be  considered  a  part  of  or  affect  the   construction  or
interpretation of any provision of this Agreement.

         12.4 Amendment;  Waiver. Any term or provision of this Agreement may be
amended only by a writing signed by Seller and Buyer. The observance of any term
or  provision  of  this  Agreement  may  be  waived  (either  generally  or in a
particular instance and either retroactively or prospectively) only by a writing
signed  by the  party to be bound by such  waiver.  No  waiver by a party of any
breach of this  Agreement  will be deemed  to  constitute  a waiver of any other
breach or any succeeding breach.

         12.5 No Third Party Beneficiaries. Nothing expressed or implied in this
Agreement  is  intended,  or shall be  construed,  to confer upon or to give any
person,  firm or  corporation,  other  than the  parties  hereto,  any rights or
remedies under or by reason of this Agreement.

         12.6 Execution in  Counterparts.  This Agreement may be executed in one
or more counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

                                       26

<PAGE>


         12.7 Assignment. This Agreement may not be assigned by any party hereto
without the prior  written  consent of each other  party;  except that Buyer may
assign this  Agreement  (and all related  agreements)  by operation of law or in
connection with any merger,  consolidation or sale of all or  substantially  all
Buyer's  assets  or in  connection  with  any  similar  transaction  or  to  any
subsidiary,  affiliate or parent of Buyer, provided that the entity to which the
Agreement is assigned in connection with any such  transaction  shall assume all
of Buyer's obligations  hereunder;  and except that Seller may assign its rights
under this  Agreement to receive  payment of the  purchase  price from Buyer and
delivery  of any  Shares  representing  such  purchase  price,  but  none of its
obligations,  liabilities  or  responsibilities,  in  whole  or in  part  to the
shareholders of Seller or to any successor entity to Seller.

         12.8 Benefit and Burden.  This Agreement  shall be binding upon,  shall
inure to the benefit of, and be enforceable  by and against,  the parties hereto
and their respective successors and permitted assigns.

         12.9 Governing  Law. This Agreement and any disputes  arising out of or
relating  to it  shall  be  governed  by the  laws of the  State  of  California
(excluding its choice of law rules) and, where  appropriate,  applicable federal
law.

         12.10  Severability.  If any  provision  of this  Agreement  is for any
reason  and to any  extent  deemed to be  invalid  or  unenforceable,  then such
provision shall not be voided but rather shall be enforced to the maximum extent
then  permissible  under then applicable law and so as to reasonably  effect the
intent of the parties hereto, and the remainder of this Agreement will remain in
full force and effect.

         12.11  Return of  Initial  Payment  in  Certain  Circumstances.  If the
Closing does not occur because of Seller's bad faith or  intentional  misconduct
or because  in the course of Buyer's  due  diligence  Buyer  discovers  facts or
circumstances   that   are   inconsistent   in   material   respects   with  the
representations  and  warranties of Seller  relating to the Acquired  Assets and
that can  reasonably be expected to have a material  adverse effect on the value
of the Acquired Assets, then without limiting Buyer's other remedies, the sum of
$250,000  that Buyer has  previously  paid to Seller will be promptly  repaid by
Seller to Buyer after a written request therefor from Buyer (or, if such payment
was made in shares of Buyer's  Common  Stock,  then Seller  shall  transfer  the
Common Stock to Buyer).  The  foregoing  shall not be deemed to reduce or modify
Seller's  obligations  hereunder to  consummate  the  transactions  contemplated
hereby.

         12.12 Prior Agreements.  This Agreement (together with the December 18,
1997  letter  from Buyer to Seller  also  executed  by  Seller,  which is hereby
incorporated by reference,  except to the extent superseded by the provisions of
Section  3.1(b)  above),  replaces  and  supersedes  in its entirety the Binding
Letter of Intent dated November 3, 1997 previously  entered into by the parties,
and upon  execution and delivery of this  Agreement by the parties,  the Binding
Letter of Intent shall be terminated and shall no further force or effect.

13.      ARBITRATION

         13.1 Arbitration. Any dispute hereunder ("Dispute") shall be settled by
means of the procedures set forth in this Section.  Each party shall give notice
to the other party of any Dispute.  Promptly  upon  delivery of such  notice,  a
designated senior officer for each of Buyer

                                       27

<PAGE>


and Seller (which  representative may be changed by a party by means of a notice
delivered  to the other  party)  shall meet and attempt in good faith to resolve
the Dispute on a mutually  satisfactory basis. If such the parties are unable to
resolve  the Dispute  within 60 days after  delivery of the notice of a Dispute,
then the Dispute shall be settled by arbitration  in San Francisco,  California,
under  the  auspices  of  Judicial  Arbitration  and  Mediation  Services,  Inc.
("JAMS"). Any judgment upon the award rendered by the arbitrators may be entered
in  any  court  having  jurisdiction  over  the  subject  matter  thereof.   The
arbitrators  shall have the authority to grant any equitable and legal  remedies
that could be  available  in any  judicial  proceeding  instituted  to resolve a
Dispute. The parties shall use their best efforts to select an arbitrator within
30 days and to resolve the Dispute within 60 days.

       13.2  Arbitrators.  Each party shall select one  arbitrator,  and the two
arbitrators  so selected shall appoint the third  arbitrator.  The parties shall
each pay  one-half of the costs of the  arbitrators.  The  arbitrators  shall be
compensated at a rate to be determined by the parties or by JAMS, but based upon
reasonable hourly or daily consulting rates for the arbitrators in the event the
parties are not able to agree upon rates of compensation.

       13.3       Further Procedures.

                  (a)  Payment  of Costs.  Seller and Buyer will each pay 50% of
the initial  compensation to be paid to the arbitrators in any such  arbitration
and 50% of the costs of transcripts and other normal and regular expenses of the
arbitration  proceedings.  The parties shall pay their own  attorneys'  fees and
costs, and all costs of arbitration, including those provided for above, will be
paid by the losing  party,  and the  arbitrator  will be authorized to make such
determinations.

                  (b) Burden of Proof. For any Dispute submitted to arbitration,
the  burden of proof  will be as it could be if the claim  were  litigated  in a
judicial proceeding.

                  (c) Award. Upon the conclusion of any arbitration  proceedings
hereunder,  the arbitrators  will render findings of fact and conclusions of law
and a written  opinion  setting  forth the basis and  reasons  for any  decision
reached and will deliver such  documents to each party to this  Agreement  along
with a signed copy of the award.

                  (d) Terms of Arbitration. The arbitrators chosen in accordance
with  these  provisions  will not have the  power to alter,  amend or  otherwise
affect  the terms of these  arbitration  provisions  or the  provisions  of this
Agreement.

                  (e) Exclusive Remedy. Except as may be specifically  otherwise
provided in this Agreement, arbitration will be the sole and exclusive remedy of
the parties for any Dispute arising out of this Agreement.

                [Remainder of this page intentionally left blank]

                                       28

<PAGE>


       IN  WITNESS  WHEREOF,  Buyer  and  Seller  executed  and  delivered  this
Agreement by their duly authorized representatives as of the Effective Date.


SELLER:                                            BUYER:

Neptune Pharmaceutical Corporation                 Cellegy Pharmaceuticals, Inc.


By: /s/ Stephen R. Gorfine, M.D.                      By: /s/ K. Michael Forrest
    ---------------------------                           ----------------------


               [Signature page to Asset Purchase Agreement between
      Neptune Pharmaceutical Corporation and Cellegy Pharmaceuticals, Inc.]

                                       29

<PAGE>


                                LIST OF EXHIBITS
                            ASSET PURCHASE AGREEMENT

Exhibit A         Purchase Price Allocation
Schedule A        Intellectual Property
Schedule B        Excluded Assets
Schedule C        Seller Agreements
Patent Assignment
Trademark Assignment
Consulting Agreement
Disclosure Letter

                                       30

<PAGE>


                                    EXHIBIT A
                            PURCHASE PRICE ALLOCATION

The purchase  price shall be allocated  among the Acquired  Assets in accordance
with their respective fair market values.

                                       31

<PAGE>


<TABLE>
                                                      SCHEDULE A
                              LIST OF INTELLECTUAL PROPERTY INCLUDED IN ACQUIRED ASSETS

Patents

<CAPTION>
Country                        Patent No.                    Date of Patent                Title
- -------                        ----------                    --------------                -----
<S>                            <C>                             <C>                         <C>
U.S.A.                         5,504,117                        4/2/96                     Pharmacologic Preparation
                                                                                           for the Treatment of Anal
                                                                                           Disorders

U.S.A.                         5,693,676                       12/2/97                     Nitric Oxide Donor
                                                                                           Composition and Method for
                                                                                           Treatment of Anal Disorders
</TABLE>


<TABLE>
Patent Applications

     Patent  applications  that are included in the  Intelleuctual  Property and
Other Assets.

Registered Trademarks


<CAPTION>
Country                  Mark                    Reg. No.                Class                   Date Reg.
- -------                  ----                    --------                -----                   ---------
<S>                      <C>                     <C>                     <C>                     <C>
U.S.A.                   ANOGESIC                2,037,222               5                       2/11/97
</TABLE>

Unregistered Trademarks

     Unregistered  trademarks that are included in the Intellectual Property and
Other Assets.

Registered Copyrights


Unregistered Copyrights

         Unregistered  Copyrights that are included in the Intellectual Property
and Other Assets

Other Intellectual Property

         As set forth in the Asset Purchase Agreement.

                                       32

<PAGE>


                                   SCHEDULE B
                                 EXCLUDED ASSETS


Neptune Pharmaceutical trade name and mark

                                       33

<PAGE>


                                   SCHEDULE C
                                SELLER AGREEMENTS

                                       34

<PAGE>


                                PATENT ASSIGNMENT


         For good and  valuable  consideration,  the  receipt of which is hereby
acknowledged,  the  person(s)  named below  (referred to as  "ASSIGNOR"  whether
singular or plural) has sold,  assigned,  and  transferred and does hereby sell,
assign, and transfer to Cellegy Pharmaceuticals, Inc., a California corporation,
having a place of business at 1065 East Hillsdale  Boulevard,  Suite 418, Foster
City, CA 94404  ("ASSIGNEE"),  for itself and its successors,  transferees,  and
assignees, the entire worldwide right, title, and interest in all inventions and
improvements  ("SUBJECT  MATTER") that are  disclosed in United  States  Letters
Patent listed on Schedule A attached hereto and the patent  applications  listed
on  Schedule  B  attached   hereto,   together  with  any  reissue,   extension,
improvement,  division,  continuation or continuation-in-part of any thereof, in
the U.S. or worldwide,  and all rights of priority  resulting from the filing in
the United States of the patents or patent applications identified on Schedule A
or B.

         ASSIGNOR  agrees that  ASSIGNEE  may apply for and receive  patents for
SUBJECT MATTER in ASSIGNEE's own name.

         ASSIGNOR  agrees  to do the  following,  when  requested,  and  without
further consideration,  in order to carry out the intent of this Assignment: (1)
execute all oaths,  assignments,  powers of  attorney,  applications,  and other
papers necessary or desirable to fully secure to ASSIGNEE the rights, titles and
interests herein conveyed;  (2) communicate to ASSIGNEE all known facts relating
to the SUBJECT MATTER;  and (3) generally do all lawful acts that ASSIGNEE shall
consider  desirable  for vesting in ASSIGNEE the rights,  titles,  and interests
herein conveyed.  ASSIGNOR further agrees to provide any successor,  assign,  or
legal  representative  of ASSIGNEE with the benefits and assistance  provided to
ASSIGNEE hereunder.

         ASSIGNOR represents that ASSIGNOR has the rights, titles, and interests
to convey as set forth herein, and covenants with ASSIGNEE that the ASSIGNOR has
made or will make hereafter no assignment,  grant,  mortgage,  license, or other
agreement affecting the rights, titles, and interests herein conveyed.

<TABLE>
         This  Assignment may be executed in one or more  counterparts,  each of
which shall be deemed an original and all of which may be taken  together as one
and the same Assignment.

<CAPTION>
                                               Date of                 Date Declaration
Name and Signature                            Signature             Executed By This Person
- ------------------                            ---------             -----------------------
Neptune Pharmaceutical Corporation
<S>                                        <C>                        <C>
By: __________________________             December 30, 1997          December 30, 1997
[ASSIGNOR  NAME]
</TABLE>

                                       35

<PAGE>


                                   SCHEDULE A
                                     Patents

                                       36

<PAGE>


                                   SCHEDULE B
                               Patent Applications

                                       37

<PAGE>


State of ____________________
County of ___________________

         On  ___________________  before  me,  _____________________  personally
appeared  ____________________  personally  known to me or  proved  to me on the
basis of satisfactory  evidence to be the person whose name is subscribed to the
within  instrument  and  acknowledged  to me that [he/she]  executed the same in
[his/her] authorized capacity, and that by [his/her] signature on the instrument
the person,  or the entity upon behalf of which the person  acted,  executed the
instrument.


         Notary Seal                     ______________________________
                                                            Notary

                                       38

<PAGE>


                              TRADEMARK ASSIGNMENT

                  THIS ASSIGNMENT is made this ____ day of December,  1997, from
Neptune Pharmaceutical Corporation, a Missouri corporation, 25 East 69th Street,
New York, NY 10021 ("Assignor"), to Cellegy Pharmaceuticals,  Inc., a California
corporation,  1065 East Hillsdale  Boulevard,  Suite 418,  Foster City, CA 94404
("Assignee").

WITNESSETH:

                  WHEREAS,  Assignor owns the U.S.  Registrations,  and Assignor
and/or Assignor's predecessor in interest,  has filed registration  applications
with respect to the  trademarks  identified in Schedule A hereto  (collectively,
the "Marks"); and

                  WHEREAS,  Assignor  and  Assignee  are parties to that certain
Asset Purchase Agreement dated as of December,  1997 (the "Agreement")  pursuant
to which Assignor has agreed to sell,  assign,  transfer,  convey and deliver to
Assignee and Assignee  has agreed to purchase  and acquire  from  Assignor,  all
right, title and interest to certain assets; and

                  WHEREAS,  in  accordance  with  the  terms  of the  Agreement,
Assignor and Assignee are desirous of transferring all right, title and interest
in and to the Marks and said  applications  and  registration  from  Assignor to
Assignee.

                  NOW,   THEREFORE,   in  consideration  of  entering  into  the
Agreement  and  other  good  and  valuable  consideration  paid by  Assignee  to
Assignor, the receipt and sufficiency of which are hereby acknowledged, Assignor
hereby confirms that it has assigned,  transferred and conveyed, and does hereby
assign,  transfer and convey,  to Assignee,  its  successors,  assigns and other
legal  representatives,  all right,  title and  interest,  including  common law
rights,  in  and  to  each  of the  Marks  and  the  registrations  thereof  and
applications  to  register  the  same  (all as set  forth in said  Schedule  A),
together  with the goodwill of the business in  connection  with which the Marks
are used or proposed to be used, and further including all claims for damages by
reason  of past  infringement  of the  Marks,  with the  right  to sue for,  and
collect, the same for Assignee's own use and benefit.

                  Assignor  represents  to Assignee that before the date of this
Trademark  Assignment it has not filed any "Intent to Use" applications under 15
U.S.C. ss. 1051(b).

                  IN WITNESS WHEREOF,  Assignor has caused this Assignment to be
duly  executed by its  authorized  representative  on and as of the day and year
first above written.

                                             Neptune Pharmaceutical Corporation,
                                             a Missouri corporation


                                             By:  _____________________________

                                             Its: _____________________________

                                       39

<PAGE>


STATE OF ____________    )
                         )
COUNTY OF ______________ )

         On _____________________ before me, _______________ personally appeared
____________________  personally  known to me or  proved  to me on the  basis of
satisfactory  evidence to be the person whose name is  subscribed  to the within
instrument and  acknowledged to me that [he/she]  executed the same in [his/her]
authorized  capacity,  and that by  [his/her]  signature on the  instrument  the
person,  or the entity  upon  behalf of which the  person  acted,  executed  the
instrument.


                                               _________________________________
                                               Notary Public

[SEAL]

                                       40

<PAGE>


                                   SCHEDULE A

                             EXISTING REGISTRATIONS

    Marks             Reg. No.             Class             Date Reg.
    -----             --------             -----             ---------

                                       41


                                                                   EXHIBIT 99.01

                  Cellegy Completes Acquisition of Anogesic(R),
         a Unique Product for Treatment of Anal Fissures and Hemorrhoids

         Foster  City,  California,  January 8, 1998 - Cellegy  Pharmaceuticals,
Inc.  (Nasdaq  National  Market:  CLGY)  announced  today that it has acquired a
promising new topical  product  candidate for the treatment of  hemorrhoids  and
anal   fissures.   The  product,   Anogesic(R),   was  purchased   from  Neptune
Pharmaceutical  Corporation  of New York  City.  The  companies  had  previously
entered into a binding letter of intent in November of last year.

         Each year in the U.S.  alone,  some 9 million  patients seek  treatment
from physicians for hemorrhoids.  In addition,  there are approximately  200,000
new cases of anal fissures per year,  over half requiring  expensive and painful
surgical intervention which sometimes leaves patients  incontinent.  Despite the
fact that existing treatments provide only partial symptomatic relief,  sales of
products  currently used to treat anal fissures and hemorrhoids are estimated to
be more than $500 million in the U.S., Europe and Japan.

         Anogesic  is a  unique,  nitroglycerin-based  product  which,  based on
published  studies  on over 400  patients,  appears  to  effectively  heal  anal
fissures and hemorrhoids.  Clinical studies published in the New England Journal
of Medicine and The Lancet have shown that nitroglycerin promotes healing and is
capable of rapidly relieving intense pain of anal fissures. In the Lancet study,
80 patients suffering from chronic anal fissures, which would ordinarily require
surgery in order to effect a cure,  were  randomized to receive  treatments with
topical  0.2%  nitroglycerin  ointment  or placebo.  After 8 weeks,  healing was
observed in 26/38 (68%) patients  treated with  nitroglycerin,  but only in 3/39
(8%) patients treated with placebo (p + 0.0001).

         Anogesic is protected by two broad U.S.  patents which cover the use of
any nitric oxide donor for the  treatment of anorectal  disorders.  Both patents
were issued last year, the most recent in December  1997. In addition,  numerous
patent applications have been filed in overseas markets.

         Commenting on the acquisition,  K. Michael Forrest, Cellegy's President
and CEO, stated,  "We believe that Anogesic will provide patients suffering from
chronic anal fissures and hemorrhoids with a simple and effective alternative to
surgery  without the risk of incontinence  that is sometimes  caused by invasive
procedures.  The market for such a product  is large and  unsatisfied."  Cellegy
plans to begin Phase III clinical  trials with  Anogesic in 1998.  Anogesic will
incorporate  Cellegy's  proprietary CELLEDIRM technology to assist in mitigating
the inflammation usually present in these conditions.

         Neptune  Pharmaceutical  was  founded  by Dr.  Stephen  R.  Gorfine,  a
prominent  colorectal  surgeon,  whose  pioneering  work led to the discovery of
Anogesic. Dr. Gorfine is an Assistant Clinical Professor of Surgery at Mt. Sinai
Medical  School in New York  City and is board  certified  in colon  and  rectal
surgery,  general  surgery  and  internal  medicine.  He will serve as a Cellegy
consultant during the completion of the Phase III clinical trials.

         Cellegy  Pharmaceuticals  is  engaged  in  the  development  of  a  new
generation of prescription  drugs and high  performance  cosmeceutical  products
based upon its  patented  topical

                                       42

<PAGE>


and  transdermal  delivery  technologies.  In addition to  Anogesic,  Cellegy is
simultaneously  testing and  developing a transdermal  testosterone  gel for the
treatment of  hypogonadism,  a condition  which results in decreased  energy and
libido in men, generally over the age of 40. Both products are expected to enter
Phase III clinical trials during 1998. The Company's most advanced  prescription
dermatologic  drug,  Glylorin(TM),  has been  licensed to Glaxo  Wellcome and is
nearing completion of Phase III clinical trials, the last testing phase required
by the FDA before market approval of a drug in the U.S. may be sought.

         This press release contains  forward-looking  statements.  Many factors
could cause actual results to differ  materially  from those  anticipated by the
statements  made in this press  release.  Among,  but not limited to these,  are
unexpected  regulatory  delays or  difficulties  relating  to  Anogesic or other
products  of Cellegy  and the  outcomes of future  clinical  trials  relating to
products under development.

For More Information:

Company Contacts: (650) 524-1600

Richard Juelis                                       K. Michael Forrest
Vice President, Finance & CFO                        President & CEO

                                       43



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