SCICLONE PHARMACEUTICALS INC
10-Q/A, 1996-10-15
PHARMACEUTICAL PREPARATIONS
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                                    FORM 10-Q/A


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

(Mark One)

     [ X ]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
                         SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 1996

                                       OR

     [   ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
                        SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________________________to ______________________

Commission file number:  0-19825

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

          California                                  94-3116852
          ----------                                  -----------
(State or other jurisdiction of                     (I.R.S. employer     
 incorporation or organization)                    identification no.) 
                                                  


901 Mariners Island Blvd., Suite 315, San Mateo, California             94404
- -----------------------------------------------------------             -----
          (Address of principal executive offices)                    (Zip code)

                                 (415) 358-3456
              (Registrant's telephone number, including area code)

                                 Not Applicable
                                 ---------------
              (Former name, former address and former fiscal year,
                          if changed since last report)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days

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

         As of July 31,  1996,  17,593,742  shares  of the  registrant's  Common
Stock, no par value, were issued and outstanding.


<PAGE>

     The  undersigned  Registrant  hereby  amends the  following  exhibit to the
Quarterly  Report on Form 10-Q for the quarterly  period ended June 30, 1996, as
set forth below:

     At the  Commission's  request,  the Registrant is refiling  Exhibit 10.1 in
accordance with the Commission's granting of an order for confidential treatment
of certain portions of Exhibit 10.1.

                         SCICLONE PHARMACEUTICALS, INC.


                                      INDEX

PART I.       FINANCIAL INFORMATION                                     PAGE NO.

Item 1.       Consolidated Financial Statements

              Consolidated Balance Sheets
                   June 30, 1996 and December 31, 1995                     3

              Consolidated Statements of Operations
                   Three and six months ended June 30, 1996 and 1995       4

              Consolidated Statements of Cash Flows
                   Six months ended June 30, 1996 and 1995                 5

              Notes to Consolidated Financial Statements                   6

Item 2.       Management's Discussion and Analysis of Financial
                   Condition and Results of Operations                     8

PART II.      OTHER INFORMATION

Item 6.       Exhibits and Reports on Form 8-K                             11


Signatures                                                                 12



                                       2
<PAGE>


PART I.  FINANCIAL INFORMATION

Item  1. Consolidated Financial Statements
<TABLE>

                                        SCICLONE PHARMACEUTICALS, INC.

                                          CONSOLIDATED BALANCE SHEETS

                                                    ASSETS
<CAPTION>

                                                                                 June 30,        December 31,
                                                                                   1996               1995
                                                                               -------------    -------------
                                                                                (unaudited)
<S>                                                                            <C>              <C>
Current assets:
    Cash and cash equivalents                                                  $   6,090,453    $   3,986,307
    Short-term investments                                                         9,196,281       15,467,685
    Accounts receivable, net                                                          85,800          108,410
    Inventory                                                                      2,485,450        2,360,479
    Prepaid expenses and other current assets                                      2,193,177        1,955,930
                                                                               -------------    -------------
Total current assets                                                              20,051,161       23,878,811

Property and equipment, net                                                          313,254          313,703
Other assets                                                                          66,722           58,381
Long-term investments                                                             27,077,875       27,935,835
Notes receivable from officers                                                     1,658,741        1,964,065
                                                                               -------------    -------------
Total assets                                                                   $  49,167,753    $  54,150,795
                                                                               =============    =============

                                  LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
    Accounts payable                                                           $     564,106    $     472,477
    Accrued compensation and benefits                                                823,150        1,086,904
    Accrued clinical trial expense                                                 1,441,811        2,054,741
    Accrued professional fees                                                      1,761,500          765,000
    Other accrued expenses                                                           363,273          216,411
                                                                               -------------    -------------
Total current liabilities                                                          4,953,840        4,595,533
                                                                               -------------    -------------
Shareholders' equity:
    Preferred stock, no par value; 10,000,000 shares
        authorized ; no shares issued and outstanding                                   --               --
     Common stock, no par value; 75,000,000 shares
        authorized; 17,470,198 and 16,807,257 shares
        issued and outstanding                                                   108,694,269      105,915,548
     Net unrealized (loss) gain on available-for-sale
        securities                                                                  (405,878)         450,086
     Accumulated deficit                                                         (64,074,478)     (56,605,519)
     Deferred compensation                                                              --           (204,853)
                                                                               -------------    -------------
Total shareholders' equity                                                        44,213,913       49,555,262
                                                                               -------------    -------------
Total liabilities and shareholders' equity                                     $  49,167,753    $  54,150,795
                                                                               =============    =============
<FN>

                                See notes to consolidated financial statements
</FN>
</TABLE>

                                       3
<PAGE>
<TABLE>

                                   SCICLONE PHARMACEUTICALS, INC.

                               CONSOLIDATED STATEMENTS OF OPERATIONS
                                            (unaudited)


<CAPTION>
                                             Three months ended             Six months ended
                                                  June 30,                     June 30,
                                            1996           1995            1996           1995
                                      ------------    ------------    ------------    ------------

<S>                                   <C>             <C>             <C>             <C>         
Product sales                         $    122,037    $     45,198    $    248,345    $     45,198

Cost of product sales                      203,660         203,293         403,460         203,293
                                      ------------    ------------    ------------    ------------
Gross profit                               (81,623)       (158,095)       (155,115)       (158,095)

Operating expenses:
     Research and development            2,542,473       2,641,347       5,077,074       4,960,531
     Marketing                           1,030,296         893,512       2,101,113       2,039,901
     General and administrative            787,636         707,939       1,563,334       1,497,903
                                      ------------    ------------    ------------    ------------
Total operating expenses                 4,360,405       4,242,798       8,741,521       8,498,335
                                      ------------    ------------    ------------    ------------
Loss from operations                    (4,442,028)     (4,400,893)     (8,896,636)     (8,656,430)

Interest and investment income, net        711,571         718,277       1,427,677       1,404,424
                                      ------------    ------------    ------------    ------------

Net loss                              $ (3,730,457)   $ (3,682,616)   $ (7,468,959)   $ (7,252,006)
                                      ============    ============    ============    ============

Net loss per share                    $      (0.21)   $      (0.22)   $      (0.43)   $      (0.43)
                                      ============    ============    ============    ============
Weighted average shares used in
     computing per share amounts        17,441,228      16,876,593      17,246,676      16,981,106
                                      ============    ============    ============    ============
<FN>


                           See notes to consolidated financial statements
</FN>
</TABLE>
                                       4
<PAGE>
<TABLE>

                                 SCICLONE PHARMACEUTICALS, INC.

                              CONSOLIDATED STATEMENTS OF CASH FLOWS
                                           (unaudited)
<CAPTION>
                                                                         Six months ended
                                                                             June 30,
                                                                      1996              1995
                                                                  -------------   -------------
<S>                                                               <C>             <C>
Operating activities:
   Net loss                                                       $ (7,468,959)   $ (7,252,006)
   Adjustments to reconcile net loss to net
   cash used in operating activities:
      Depreciation and amortization                                    288,434         253,251
      Changes in operating assets and liabilities:
         Accounts receivable                                            22,610         (40,727)
         Inventory                                                    (124,971)     (1,028,312)
         Prepaid expenses and other assets                              59,736      (1,502,062)
         Accounts payable and other accrued expenses                   238,491        (206,744)
         Accrued clinical trial expense                               (612,930)        208,815
         Accrued professional fees                                     996,500         213,750
         Accrued compensation and benefits                            (263,754)       (516,972)
                                                                  ------------    ------------
Net cash used in operating activities                               (6,864,843)     (9,871,007)
                                                                  ------------    ------------
Investing activities:
   Purchase of property and equipment                                  (83,132)        (95,698)
   Sale of short and long term investments, net                      6,273,400      10,607,701
                                                                  ------------    ------------
Net cash provided by investing activities                            6,190,268      10,512,003
                                                                  ------------    ------------

Financing activities:
   Proceeds from issuance of common stock, net                       2,778,721          63,338
   Repurchase of common stock                                             --        (1,924,897)
                                                                  ------------    ------------
Net cash provided by (used in) financing activities                  2,778,721      (1,861,559)
                                                                  ------------    ------------
Net increase (decrease) in cash and cash equivalents                 2,104,146      (1,220,563)
Cash and cash equivalents, beginning of period                       3,986,307       8,292,888
                                                                  ------------    ------------
Cash and cash equivalents, end of period                          $  6,090,453    $  7,072,325
                                                                  ============    ============
Supplemental disclosures of noncash financing activities:
   Net unrealized (loss) gain on available-for-sale securities        (855,964)      2,045,461
<FN>

                         See notes to consolidated financial statements
</FN>
</TABLE>
                                       5
<PAGE>


                         SCICLONE PHARMACEUTICALS, INC.

                   Notes to Consolidated Financial Statements


1.       The accompanying  unaudited consolidated financial statements have been
         prepared in conformity with generally  accepted  accounting  principles
         consistent  with those  applied  in, and should be read in  conjunction
         with, the audited financial  statements for the year ended December 31,
         1995. The interim financial  information  reflects all normal recurring
         adjustments  which are, in the opinion of  management,  necessary for a
         fair  presentation  of the results for the interim and  commencement to
         date  periods  presented.  The  interim  results  are  not  necessarily
         indicative of results for the full year.

2.       Net loss per share has been computed using the weighted  average number
         of common  shares  outstanding  during  each period  presented.  Common
         equivalent  shares  for  outstanding  options  and  warrants  were  not
         included in the weighted average shares outstanding  because the effect
         of including them is antidilutive.
<TABLE>

3.       The following is a summary of available-for sale securities at June 30,
         1996:
<CAPTION>

                                                  Available-for-Sale Securities             
                                 -----------------------------------------------------------
                                                    Gross          Gross          Estimated
                                                  Unrealized     Unrealized         Fair
                                      Cost          Gains          Losses          Value
                                 ------------   ------------    ------------    ------------
<S>      <C>                     <C>            <C>             <C>             <C>
         U.S. Government &
          Agency obligations     $ 24,995,308   $      2,581    $   (347,534)   $ 24,650,355
         Corporate obligations     11,484,726         10,255         (79,682)     11,415,299
         Corporate securities         200,000         24,102         (15,600)        208,502
                                 ------------   ------------    ------------    ------------
                                 $ 36,680,034   $     36,938    $   (442,816)   $ 36,274,156
                                 ============   ============    ============    ============
</TABLE>
                        
         The  amortized  cost and  estimated  fair value of debt and  marketable
         securities at June 30, 1996 by contractual maturity are shown below.

                                                                 Estimated  
                                                                   Fair
                                                      Cost         Value
                                                  -----------   -----------
         Due in one year or less                  $ 9,016,529   $ 8,987,779
         Due after one year through three years    21,122,138    20,855,060
         Due after three years                      6,341,367     6,222,815
                                                  -----------   -----------
                                                   36,480,034    36,065,654
         Corporate securities                         200,000       208,502
                                                  -----------   -----------
                                                  $36,680,034   $36,274,156
                                                  ===========   ===========
          
4.       The following is a summary of inventories at June 30, 1996:

          Raw materials                    $2,445,038
          Finished goods                       40,412
                                           ----------
                                           $2,485,450
                                           ==========
 
                                      6
<PAGE>


5.       In April 1996,  the Company  acquired an  exclusive  license for CPX, a
         synthetic  compound  developed  by the National  Institutes  of Health,
         ("NIH") as a potential treatment for cystic fibrosis.  NIH will receive
         certain  milestone  payments upon  successful  research and development
         results in addition to royalties on net sales revenue.

                                       7
<PAGE>


Item 2. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations


         Except for  historical  information  contained  herein,  the  following
material is a  forward-looking  statement  that is subject to certain  risks and
uncertainties.  These  risks and  uncertainties  include the  Company's  current
reliance on a single product, ZADAXIN(R) thymosin alpha 1, for its revenues, the
absence of regulatory approval for ZADAXIN in significant markets, uncertainties
regarding  prospects for regulatory  approvals based on existing  clinical data,
risks  associated with the  manufacture and supply of ZADAXIN and  relationships
with collaborative  partners, and competition from competing therapies,  as well
as other risks and  uncertainties  described  herein and in the Company's Annual
Report on Form 10-K and its other  reports  filed with the  Securities  Exchange
Commission.

         The Company is an international  biopharmaceutical  company involved in
the acquisition, development and commercialization of pharmaceuticals worldwide.
The  Company's  focus is on  therapeutics  for  diseases  that are  chronic  and
life-threatening,  including  hepatitis  B  and  C,  cancer  and  immune  system
disorders.  To date, the Company's  principal focus has been the development and
commercialization of ZADAXIN.

         From  commencement  of  operations  through June 30, 1996,  the Company
incurred a  cumulative  net loss of  approximately  $64.1  million.  The Company
expects its  operating  expenses to increase  over the next several  years as it
expands  its  research  and   development,   clinical   testing  and   marketing
capabilities.  The Company's ability to achieve a profitable level of operations
currently  is  dependent  in large part on  securing  regulatory  approvals  for
ZADAXIN in additional countries,  successfully  launching ZADAXIN once approved,
acquiring rights to additional drugs, and entering into and extending agreements
for product development and commercialization,  where appropriate.  There can be
no  assurance  that  the  Company  will  ever  achieve  a  profitable  level  of
operations.

         The Company's  operating results may fluctuate from period to period as
a result of, among other things,  the timing and costs  associated with clinical
trials and the regulatory  approval  process,  and the acquisition of additional
product rights.  The Company  participates in a highly dynamic  industry,  which
often results in significant volatility of the Company's common stock price. Any
setbacks  in  clinical  trials,  in  the  regulatory   approval  process  or  in
relationships  with  collaborative  partners,  and any  shortfalls in revenue or
earnings from levels expected by securities analysts,  among other developments,
have in the past had and could in the future have an immediate  and  significant
adverse  effect on the trading price of the Company's  common stock in any given
period.


Results of Operations

         Product sales reached approximately $122,000 and $248,000 for the three
and six  month  periods  ended  June 30,  1996,  respectively,  as  compared  to
approximately $45,000 for each of the corresponding periods in 1995. The Company
commenced  shipment  of  ZADAXIN  in the  second  quarter  of 1995  and has been
recording product sales under a named patient registration  program. The Company
has filed for approval to market  ZADAXIN in several  countries and  anticipates
additional filings in other countries.  As a result, the Company expects product
sales to increase during the remainder of 1996 and beyond if additional  ZADAXIN
marketing  approvals  are  obtained.  Although  the Company  remains  optimistic
regarding the prospects of ZADAXIN,  there can be no assurance  that the Company
will ever achieve significant levels of product sales.

                                       8
<PAGE>

         Cost of product sales was  approximately  $204,000 and $403,000 for the
three and six month  periods ended June 30, 1996,  respectively,  as compared to
approximately  $203,000  for each of the  corresponding  periods  in 1995.  This
increase relates to the Company's  increase in product sales and the fixed costs
associated with acquiring and warehousing product inventory. The Company expects
cost of product sales to vary from quarter to quarter,  dependent upon the level
of product sales and the absorption of fixed product-related costs.

         Research and  development  expenses were  approximately  $2,542,000 and
$5,077,000   for  the  three  and  six  month   periods  ended  June  30,  1996,
respectively,  as compared to  approximately  $2,641,000  and $4,961,000 for the
corresponding  periods  in 1995.  The  decrease  in the  three  month  period is
primarily attributable to decreased clinical trials expenses offset by increased
professional fees. The change in the six month period is primarily  attributable
to increased  payroll costs and professional  fees offset by decreased  clinical
trials expenses.  In April,  1996, the Company acquired an exclusive license for
CPX, a synthetic  compound  developed by the National  Institutes of Health as a
potential  treatment for cystic  fibrosis.  The Company has incurred  additional
professional  consulting  service  fees  to  initiate  the  development  of this
compound.  The decrease in clinical  trial  expenses  was  primarily a result of
completion of enrollment  in the ZADAXIN U.S.  Phase III Hepatitis C trial.  The
Company is currently  reviewing  its U.S. and European  ZADAXIN  clinical  trial
strategy  and the results of this review will have a  significant  effect on the
Company's  research and  development  expenses.  In general,the  Company expects
research and development expenses to increase over the next several years and to
vary quarter to quarter as the Company initiates  additional clinical trials and
testing,  acquires  product rights,  initiates  additional  trials,  and expands
regulatory activities.

         Marketing expenses were approximately $1,030,000 and $2,101,000 for the
three and six month  periods ended June 30, 1996,  respectively,  as compared to
$894,000 and $2,040,000 for the  corresponding  periods in the prior year.  This
increase is primarily  attributable to increased  professional services expenses
offset by decreased  payroll costs related to an executive  officer who left the
Company  in  1995.   The  Company   expects   marketing   expenses  to  increase
significantly in the next several years as it expands its  commercialization and
marketing efforts and pursues other strategic relationships.

         General and  administrative  expenses were  approximately  $788,000 and
$1,563,000   for  the  three  and  six  month   periods  ended  June  30,  1996,
respectively,  as compared to  approximately  $708,000  and  $1,498,000  for the
corresponding periods in the prior year. The increase is primarily  attributable
to  increased  payroll  costs  offset by  decreased  expenses  for  professional
services,  primarily  legal services and consulting  fees. In the near term, the
Company expects general and  administrative  expenses to vary quarter to quarter
as the Company  augments its general and  administrative  activities  to support
increased   expenditures  on  clinical  trials  and  testing,   and  regulatory,
pre-commercialization and marketing activities.

         Net  interest  and  investment  income was  approximately  $712,000 and
$1,428,000   for  the  three  and  six  month   periods  ended  June  30,  1996,
respectively,  as compared to approximately  $718,000 and $1,404,000 in the same
periods  in 1995.  The  changes  in the three and six  month  periods  primarily
resulted  from  decreased  interest and  investment  income due to lower average
invested cash balances offset by overall increased rates and gains from the sale
of certain short-term investments.

                                       9
<PAGE>

Liquidity and Capital Resources

         At June 30, 1996,  the Company had  approximately  $42,365,000 in cash,
cash equivalents and highly liquid short and long term investments.

         Net cash  used by the  Company  in  operating  activities  amounted  to
approximately  $6,865,000 for the six month period ended June 30, 1996. Net cash
used in operating  activities  in the 1996 period is less than the Company's net
loss  for  such  period  primarily  due  to  noncash  charges   associated  with
depreciation  and  amortization,  decreases in and prepayments of certain future
period  expenses and increases in amounts owed for accounts  payable and accrued
professional  fees.  These were offset by cash used for inventory  purchases and
decreases  in amounts owed to third  parties for goods and  services  related to
clinical  trial  expenses  and  compensation  and  benefits.  Net  cash  used in
operating  activities  amounted to  approximately  $9,871,000  for the six month
period ended June 30, 1995.  Net cash used in operating  activities  in the 1995
period is greater than the Company's  net loss for such period  primarily due to
inventory  purchases,  the  prepayment  of certain  future  period  expenses and
payments for accrued compensation and benefits and accounts payable.  These uses
were offset by  increases in amounts  owed to third  parties for clinical  trial
expenses and professional  fees, in addition to noncash charges  associated with
depreciation and amortization.

         Net cash  provided by  investing  activities  for the six month  period
ended June 30,  1996  related  to the net sale of  approximately  $6,273,000  of
marketable  securities  offset by the  purchase  of  $83,000  in  equipment  and
furniture.  Net cash provided in investing  activities for the  comparable  1995
period  primarily  resulted  from  the net  sale of  $10,608,000  of  marketable
securities offset by the purchase of $96,000 of equipment and furniture.

         Net cash  provided by  financing  activities  for the six month  period
ending June 30, 1996 primarily consisted of approximately $2,779,000 in proceeds
received for the issuance of common stock under the Company's stock option plan.
Net cash used in financing  activities  for the six month period ending June 30,
1995 related to  repurchases  of the  Company's  common  stock of  approximately
$1,925,000 offset by approximately $63,000 in proceeds received from issuance of
common stock under the Company's stock option plan.

         Management  believes its  existing  capital  resources  and interest on
funds  available are adequate to maintain its current and planned  operations at
least  through 1997.  However,  the Company's  capital  requirements  may change
depending upon numerous  factors,  including the  availability of  complementary
products,  technologies  and  businesses,  the  results of  clinical  trials and
testing, the timing of regulatory approvals,  developments in relationships with
collaborative  partners and the status of competitive  products.  If the Company
cannot  eventually  generate  sufficient funds from operations,  it will need to
raise additional  financing.  There can be no assurance that such financing will
be available on acceptable terms, or at all.

                                       10
<PAGE>

PART II. OTHER INFORMATION


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

(a)           Exhibits

              Exhibit
              Number                      Description
              --------                    -----------

              10.1         License  Agreement  effective  April 19, 1996 between
                           the Registrant and the National  Institutes of Health
                           Office of Technology Transfer*

              27           Financial Data Schedule

(b)           Reports on Form 8-K

              None


*             Confidential treatment requested.


                                       11

<PAGE>

                                   SIGNATURES


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


                                           SCICLONE PHARMACEUTICALS, INC.
                                                    (Registrant)




Date:   August 14, 1996                          Donald R. Sellers
                                    --------------------------------------------
                                                 Donald R. Sellers
                                              Chief Executive Officer
                                           (Principal Executive Officer)



Date:   August 14, 1996                           Mark A. Culhane
                                     -------------------------------------------
                                                  Mark A. Culhane
                                     Vice President, Finance and Administration
                                            and Chief Financial Officer
                                     (Principal Financial & Accounting Officer)

                                       12

<PAGE>

                                  EXHIBIT INDEX



Exhibit
Number                          Description 
- -------                         -----------
10.1       License Agreement effective April 19, 1996 between the Registrant and
           the National Institutes of Health Office of Technology Transfer*

27         Financial Data Schedule**

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

*        Confidential treatment requested.

** This  exhibit  shall not be deemed  filed for  purposes  of Section 11 of the
Securities  Act,  Section 18 of the  Exchange  Act, and Section 323 of the Trust
Indenture Act, or otherwise be subject to the liabilities of such sections.


                              PUBLIC HEALTH SERVICE

                       PATENT LICENSE AGREEMENT--EXCLUSIVE

                                   COVER PAGE

For PHS internal use only:

Patent License Number:         L-223-95

   Serial Numbers of Licensed Patents:  (1) U.S.  Patent No.  5,366,977,  issued
                                        November    22,   1994   (U.S.    Patent
                                        Application Serial No. 07/952,965, filed
                                        September 29, 1992),  entitled  "Methods
                                        of  Treating   Cystic   Fibrosis   Using
                                        8-Cyclopentyl-1,  3-Dipropylxanthine  or
                                        Xanthine Amino  Congeners;" and (2) U.S.
                                        Patent     Application     Serial    No.
                                        08/343,714,  filed  November  22,  1994,
                                        entitled   "A  Method   of   Identifying
                                        CFTR-Binding    Compounds   Useful   for
                                        Activating   Chloride   Conductance   in
                                        Animal Cells"

   Licensee: SciClone Pharmaceuticals, Inc.
             901 Mariner's Island Boulevard
             San Mateo, California  94404

   CRADA Number (if applicable):   Not Applicable.

   Additional Remarks:  (1) For U.S. Patent No. 5,366,977,  entitled "Methods of
                        Treating          Cystic          Fibrosis         Using
                        8-Cyclopentyl-1,3-Dipropylxanthine   or  Xanthine  Amino
                        Congeners":  exclusively  for the  treatment  of  cystic
                        fibrosis and (2) For U.S. Patent  Application Serial No.
                        08/343,714,  filed November 22, 1994, entitled "A Method
                        of  Identifying   CFTR-Binding   Compounds   Useful  for
                        Activating  Chloride  Conductance in Animal Cells":  (i)
                        exclusively  for the  treatment  and diagnosis of cystic
                        fibrosis in humans;  (ii)  exclusively  for the class of
                        compounds  claimed for  therapeutic  and diagnostic uses
                        for  human   diseases   other   than   cystic   fibrosis
                        conditionally  for a period of twenty-four  (24) months;
                        and (iii)  nonexclusively  for methods  for  identifying
                        CFTR-binding compounds.

         This  Patent  License  Agreement,   hereinafter   referred  to  as  the
"Agreement,"  consists of this Cover Page,  an attached  Agreement,  a Signature
Page,  Appendix  A (List of  Patent(s)  or Patent  Application(s)),  Appendix  B
(Fields   of  Use  and   Territory),   Appendix   C   (Royalties),   Appendix  D
(Modifications), Appendix E (Benchmarks), and Appendix F (Commercial Development
Plan). The Parties to this Agreement are:


<PAGE>

         1) The National  Institutes of Health ("NIH"),  the Centers for Disease
Control and Prevention  ("CDC"),  or the Food and Drug  Administration  ("FDA"),
hereinafter singly or collectively  referred to as "PHS," agencies of the United
States Public Health  Service within the Department of Health and Human Services
("DHHS"); and

         2) The person,  corporation,  or institution identified above and/or on
the Signature  Page,  having  offices at the address  indicated on the Signature
Page, hereinafter referred to as "Licensee."


                                      -2-

<PAGE>


                     PHS PATENT LICENSE AGREEMENT--EXCLUSIVE

     PHS and Licensee agree as follows:

     1.   BACKGROUND

          1.01 In the course of conducting  biomedical and behavioral  research,
PHS investigators made inventions that may have commercial applicability.

          1.02 By assignment  of rights from PHS employees and other  inventors,
DHHS,  on behalf of the United States  Government,  owns  intellectual  property
rights claimed in any United States and foreign patent  applications  or patents
corresponding  to  the  assigned   inventions.   DHHS  also  owns  any  tangible
embodiments of these inventions actually reduced to practice by PHS.

          1.03 The  Assistant  Secretary for Health of DHHS has delegated to PHS
the authority to enter into this  Agreement for the licensing of rights to these
inventions under 35 U.S.C. ss.ss.200-212, the Federal Technology Transfer Act of
1986,  15 U.S.C.  ss.3710a,  and/or the  regulations  governing the licensing of
Government-owned inventions, 37 CFR Part 404.

          1.04 PHS desires to transfer  these  inventions to the private  sector
through  commercialization  licenses to facilitate the commercial development of
products and processes for public use and benefit.

          1.05 Licensee desires to acquire  commercialization  rights to certain
of these  inventions  in order to  develop  processes,  methods,  or  marketable
products for public use and benefit.

     2.   DEFINITIONS

          2.01 "Benchmarks"  mean the performance  milestones that are set forth
in Appendix E, as may be amended from time to time by mutual written consent.

          2.02 "Commercial Development Plan" means the written commercialization
plan  attached  as  Appendix  F, as may be  amended  from time to time by mutual
written consent.

          2.03  "First  Commercial  Sale"  means the  initial  transfer by or on
behalf of  Licensee  or its  sublicensees  of  Licensed  Products or the initial
practice of a Licensed  Process by or on behalf of Licensee or its  sublicensees
in exchange for cash or some  equivalent  to which value can be assigned for the
purpose of determining Net Sales, provided, however, First Commercial Sale shall
not  include  transfers  at or  below  cost by or on  behalf  of  Licensee,  its
Affiliates, or its Sublicensees of Licensed Products or the practice of Licensed
Processes  in  connection  with  compassionate  use,  emergency  use,  treatment
Investigational  New Drug  Applications  (IND's),  or the like authorized by the
U.S. Food and Drug Administration ("FDA") or corresponding foreign agencies.

          2.04  "Government" means  the  Government  of  the  United  States  of
America.


                                      -3-
<PAGE>

          2.05  "Licensed Fields  of Use" means the fields of use  identified in
Appendix B.

          2.06  "Licensed Patent Rights" shall mean:

                a) U.S.,  Patent  Cooperation  Treaty (PCT),  and foreign patent
applications  and patents listed in Appendix A, all divisions and  continuations
of these  applications,  all patents issuing from such applications,  divisions,
and  continuations,  and  any  reissues,  reexaminations,  reregistrations,  and
extensions of all such patents;

                b) to the extent that the  following  contain one or more claims
directed  to  the   invention  or   inventions   disclosed   in  a)  above:   i)
continuations-in-part  of a) above; ii) all divisions and continuations of these
continuations-in-part; iii) all patents issuing from such continuations-in-part,
divisions,   and   continuations;   and   iv)  any   reissues,   reexaminations,
reregistrations, and extensions of all such patents;

                c) to the extent that the  following  contain one or more claims
directed to the invention or inventions  disclosed in a): above all  counterpart
foreign  applications and patents to a) and b) above,  including those listed in
Appendix A.

                Licensed  Patent  Rights shall not include b) or c) above to the
extent that they contain one or more claims  directed to new matter which is not
the subject matter disclosed in a) above.

          2.07 "Licensed  Process(es)"  means processes  which, in the course of
being practiced  would,  in the absence of this Agreement,  infringe one or more
claims  of the  Licensed  Patent  Rights  that  have not been  held  invalid  or
unenforceable by an unappealed or unappealable  judgment of a court of competent
jurisdiction.

          2.08 "Licensed  Product(s)"  means tangible  materials  which,  in the
course of  manufacture,  use, or sale would,  in the absence of this  Agreement,
infringe  one or more claims of the  Licensed  Patent  Rights that have not been
held invalid or  unenforceable  by an unappealed or  unappealable  judgment of a
court of competent jurisdiction.

          2.09 "Licensed  Territory" means the  geographical  area identified in
Appendix B.

          2.10 "Net Sales" means  [REDACTED]* for sales of Licensed  Products or
practice of Licensed  Processes by or on behalf of Licensee or its sublicensees,
and from leasing,  renting,  or otherwise making Licensed Products  available to
others  without  sale or  other  dispositions,  whether  invoiced  or not,  less
[REDACTED]*.

          2.11  "Practical  Application"  means to  manufacture in the case of a
composition  or product,  to practice in the case of a process or method,  or to
operate  in the case of a  machine  or  system;  and in each  case,  under  such
conditions  as to establish  that the  invention is being  utilized and that its
benefits are to the extent permitted by law or Government  regulations available
to the public on reasonable terms.

                                      -4-


*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.


<PAGE>

          2.12 "Research License" means a nontransferable,  nonexclusive license
to make and to use the Licensed Products or Licensed Processes as defined by the
Licensed  Patent  Rights solely for purposes of research and not for purposes of
commercial manufacture or distribution or in lieu of purchase.

          2.13  "Affiliate"  means  any  corporation  or other  business  entity
controlling,  controlled  by, or under common  control with  Licensee.  For this
purpose,  "control"  means direct or indirect  beneficial  ownership of at least
fifty  percent  (50%)  interest  in the  income  of such  corporation  or  other
business.

          2.14  "Combined  Product"  means a product  that  contains  a Licensed
Product along with at least one other active component or active  ingredient not
covered by the Licensed Patent Rights.

          2.15  "Class  of   Compounds"   means  the  class  of  compounds   and
compositions  claimed in U.S. Patent Application  Serial No.  08/343,714,  filed
November  22,  1994,  listed in  Appendix A, and any  continuations,  divisions,
continuations-in-part,  and  counterparts of this application as provided for in
Paragraph 2.06.

          2.16  "Effective  Date"  means the date on when the last party to sign
has executed this Agreement.

     3.   GRANT OF RIGHTS

          3.01 PHS hereby grants to Licensee and its  Affiliate(s)  and Licensee
and its  Affiliate(s)  accepts,  subject  to the  terms and  conditions  of this
Agreement, an exclusive license as set forth in Appendix B:

               for the  therapeutic  treatment  of cystic  fibrosis in humans as
claimed in U.S. Patent 5,366,977;

               for  the  therapeutic  and  diagnostic  applications  for  cystic
fibrosis in humans for the Class of Compounds claimed in U.S. Patent Application
Serial No. 08/343,714; and

               conditionally  for  twenty-four  (24) months  from the  Effective
Date, for the Class of Compounds as claimed in U.S.  Patent  Application  Serial
No. 08/343,714 for therapeutic and diagnostic uses for human diseases other than
cystic fibrosis

               under the Licensed  Patent  Rights in the  Licensed  Territory to
make and have made,  to use and have used,  to sell and have sold,  to offer for
sale and import into the United  States any  Licensed  Products in the  Licensed
Fields of Use and to practice and have  practiced any Licensed  Processes in the
Licensed  Fields of Use.  Licensee  shall notify PHS in writing of any Affiliate
included under this paragraph 3.01.

          3.02 This  Agreement  confers  no  license  or rights by  implication,
estoppel,  or otherwise to either party under any patent applications or patents
of PHS or of Licensee other

                                      -5-

<PAGE>

than Licensed Patent Rights regardless  of  whether  such  patents are  dominant
or  subordinate  to Licensed Patent Rights.

          3.03 PHS hereby grants and Licensee accepts,  subject to the terms and
conditions of this Agreement,  a nonexclusive license as set forth in Appendix B
for methods for identifying CFTR-binding compounds under U.S. Patent Application
Serial No. 08/343,714 under the Licensed Patent Rights in the Licensed Territory
to use in Licensee's internal research program.

          3.04 PHS grants Licensee the benefit of any patent term extensions and
reregistrations applicable to the Licensed Patent Rights and any Orphan Drug Act
registrations  applicable  to  Licensed  Products  and  Licensed  Processes  and
comparable extensions and registrations in foreign countries within the Licensed
Territory.  PHS  agrees  to  submit  applications  to  appropriate  governmental
agencies at the request and expense of Licensee or to  otherwise  cooperate,  at
Licensee's   expense,  in  connection  with  applying  for  and  obtaining  such
extensions and registrations.

          3.05 To the extent permitted by law, governmental regulation,  and PHS
policy,  for  purposes  only of seeking  regulatory  approval  to  commercialize
Licensed Products and Licensed Processes, PHS agrees to make its preclinical and
clinical  data,  if any,  relating to Licensed  Products and Licensed  Processes
available nonexclusively to Licensee.

          3.06 This  Agreement  provides  no rights to PHS to utilize  rights to
Licensee's solely  owned intellectual  property,  know-how,  data, or regulatory
submissions or to  disseminate  such  information to third parties,  except with
Licensee's consent or as otherwise required by law.

     4.   SUBLICENSING

          4.01  Upon  written  approval  by  PHS,  which  approval  will  not be
unreasonably withheld, Licensee may enter into sublicensing agreements under the
Licensed  Patent Rights as set forth in Appendix B for the  exclusive  fields of
use:

               for the  therapeutic  treatment  of cystic  fibrosis in humans as
claimed in U.S. Patent 5,366,977;

               for  the  therapeutic  and  diagnostic  applications  for  cystic
fibrosis in humans for the Class of Compounds claimed in U.S. Patent Application
Serial No. 08/343,714; and

               conditionally  for  twenty-four  (24) months  from the  Effective
Date, for the Class of Compounds as claimed in U.S.  Patent  Application  Serial
No. 08/343,714 for therapeutic and diagnostic uses for human diseases other than
cystic fibrosis.

          4.02 Licensee agrees that any sublicenses  granted by it shall provide
that the obligations to PHS of Paragraphs  5.01-5.04,  8.01, 10.01, 10.02, 12.05
and 13.07-13.09 of this Agreement shall be binding upon the sublicensee as if it
were a party to this  Agreement.  Licensee  further  agrees to attach  copies of
these Paragraphs to all sublicense agreements.

                                      -6-

<PAGE>

          4.03  Any  sublicenses  granted  by  Licensee  shall  provide  for the
termination of the sublicense,  or the conversion to a license  directly between
such sublicensees and PHS, at the option of the sublicensee, upon termination of
this  Agreement  under  Article 13. Such  conversion is subject to PHS approval,
which approval will not unreasonably be withheld, and contingent upon acceptance
by the sublicensee of the remaining provisions of this Agreement. Any sublicense
granted by Licensee shall further  provide for the termination of the sublicense
or the conversion to a license  directly  between such  sublicensees and PHS, at
the  option of the  sublicensee,  if PHS  rescinds  a  Licensed  Field of Use to
Licensee  and said  Licensed  Field of Use was  granted by the  Licensee in said
sublicense.  Such conversion is subject to PHS approval, which approval will not
unreasonably  be withheld,  and contingent upon acceptance by the sublicensee of
the remaining provisions of this Agreement.

          4.04 Licensee  agrees to forward to PHS a copy of each fully  executed
sublicense agreement postmarked within thirty (30) days of the execution of such
agreement.  To the extent  permitted  by law,  PHS agrees to maintain  each such
sublicense agreement in confidence.

          4.05 Licensee has no right to grant  sublicenses  to the  nonexclusive
fields of use set forth in Appendix B, except as otherwise agreed to by PHS.

     5.   STATUTORY AND PHS REQUIREMENTS AND RESERVED GOVERNMENT RIGHTS

          5.01  PHS  reserves  on  behalf  of  the  Government  an  irrevocable,
nonexclusive,  nontransferable,  royalty-free  license  for the  practice of all
inventions  licensed under the Licensed Patent Rights throughout the world by or
on  behalf  of  the  Government  and on  behalf  of any  foreign  government  or
international  organization  pursuant  to  any  existing  or  future  treaty  or
agreement to which the Government is a signatory.  Prior to the First Commercial
Sale,  Licensee  agrees to  reasonably  consider  requests by PHS to provide PHS
reasonable  quantities  of  Licensed  Products  or  materials  made  through the
Licensed Processes solely for PHS research use.

          5.02  Licensee  agrees that products used or sold in the United States
embodying  Licensed Products or produced through use of Licensed Processes shall
be manufactured  substantially in the United States,  unless a written waiver is
obtained in advance from PHS.

          5.03 Licensee  acknowledges that PHS may enter into future Cooperative
Research  and  Development  Agreements  (CRADAs)  under the  Federal  Technology
Transfer  Act of 1986 that  relate  to the  subject  matter  of this  Agreement.
Licensee  agrees not to unreasonably  deny requests for a Research  License from
such future  collaborators  with PHS when  acquiring such rights is necessary in
order to make a CRADA project  feasible.  Licensee may request an opportunity to
join as a party to the proposed CRADA.

          5.04 In addition to the reserved  license of Paragraph 5.01 above, PHS
reserves the right to grant such  nonexclusive  Research Licenses directly or to
require Licensee to grant  nonexclusive  Research  Licenses on reasonable terms.
The purpose of this Research  License is to encourage  basic  research,  whether
conducted at an academic or corporate facility. In order to


                                      -7-


<PAGE>

safeguard the Licensed Patent Rights,  however,  PHS shall consult with Licensee
before granting to commercial  entities a Research  License or providing to them
research samples of the materials,  provided, however, that PHS will not provide
materials  obtained from Licensee under Paragraph 5.01 to third parties,  except
with Licensee's consent.

     6.   ROYALTIES AND REIMBURSEMENT

          6.01  Licensee  agrees  to pay to PHS a  noncreditable,  nonrefundable
license issue royalty as set forth in Appendix C.

          6.02  Licensee  agrees to pay to PHS a  nonrefundable  minimum  annual
royalty  as set forth in  Appendix  C. The  minimum  annual  royalty  is due and
payable on  January 1 of each  calendar  year and may be  credited  against  any
earned  royalties  due for sales made in that year.  However,  the first minimum
annual  royalty  shall be due and payable on June 30, 1997  covering  the period
from January 1, 1997 to December 31, 1997.

          6.03  Licensee  agrees  to pay PHS  earned  royalties  as set forth in
Appendix C.

          6.04 Licensee  agrees to pay PHS  benchmark  royalties as set forth in
Appendix C.

          6.05 Licensee agrees to pay PHS sublicensing royalties as set forth in
Appendix C.

          6.06 A claim of a patent or patent  application  licensed  under  this
Agreement  shall cease to fall within the Licensed Patent Rights for the purpose
of computing the minimum annual royalty and earned royalty payments in any given
country in the Licensed Territory on the earliest of the dates that a) the claim
has been  abandoned  but not  continued,  b) the patent  expires or  irrevocably
lapses,  or c) the claim  has been held to be  invalid  or  unenforceable  by an
unappealed  or  unappealable  decision of a court of competent  jurisdiction  or
administrative agency.

          6.07 No  multiple  royalties  shall be payable  because  any  Licensed
Products or  Licensed  Processes  are  covered by more than one of the  Licensed
Patent Rights.

          6.08 On sales of Licensed  Products by  Licensee  to  sublicensees  or
affiliated  parties or on sales made in other than an arm's-length  transaction,
the value of the Net Sales attributed under this Article 6 to such a transaction
shall be that which  would have been  received in an  arm's-length  transaction,
based on sales of like quantity and quality  products to similar  entities on or
about the time of such transaction. Notwithstanding the foregoing, sales between
and among Licensee and its Sublicensees and/or Affiliates which are intended for
resale  shall not be included in Net Sales.  In such cases,  royalties  shall be
calculated  on the  basis  of Net  Sales  of  Licensed  Product(s)  by any  such
Sublicensee or Affiliate to a non-Affiliate as provided in Section 6.03 hereof.

          6.09 With regard to expenses associated with the preparation,  filing,
prosecution,  and maintenance of all patent  applications  and patents  included
within the Licensed

                                      -8-


<PAGE>

Patent  Rights  incurred by PHS prior to the effective  date of this  Agreement,
Licensee shall pay to PHS, as an additional  royalty,  within sixty (60) days of
PHS's  submission of a statement and request for payment to Licensee,  an amount
equivalent to such patent expenses previously incurred by PHS.

          6.10 With regard to expenses associated with the preparation,  filing,
prosecution,  and maintenance of all patent  applications  and patents  included
within the Licensed Patent Rights incurred by PHS on or after the effective date
of this Agreement, PHS, at its sole option, may require Licensee:

               (a) to pay PHS on an  annual  basis,  within  sixty  (60) days of
PHS's  submission  of a  statement  and request for  payment,  a royalty  amount
equivalent to all such patent  expenses  incurred  during the previous  calendar
year(s); or

               (b) to pay such expenses directly to the law firm employed by PHS
to handle such functions  within thirty (30) days of Licensee's  receipt of such
law firm's submission of a statement and request for payment.  However,  in such
event, PHS and not Licensee shall be the client of such law firm.

               Under exceptional circumstances,  Licensee may be given the right
to  assume  responsibility  for  the  preparation,   filing,   prosecution,   or
maintenance  of any patent  application  or patent  included  with the  Licensed
Patent  Rights.  In that event,  Licensee  shall  directly pay the  attorneys or
agents engaged to prepare,  file, prosecute or maintain such patent applications
or patents and shall provide to PHS copies of each invoice  associated with such
services as well as documentation  that such invoices have been paid. Any patent
costs  incurred  after the Effective  Date of this Agreement will be shared on a
pro rata basis by all  licensees to the Licensed  Patent Rights at the time when
said costs are incurred.

          6.11  Licensee may elect to surrender its rights in any country of the
Licensed Territory under any Licensed Patent Rights upon sixty (60) days written
notice  to  PHS  and  owe  no  payment   obligation   under   Article  6.10  for
patent-related  expenses  incurred in that country after the  effective  date of
such written notice.

          6.12  If the  Licensee,  its  Sublicensee,  or  Affiliate(s)  sells  a
Combined   Product,   the  Net  Sales  price  for  purposes  of  earned  royalty
determination under this Article 6 shall be calculated by multiplying the market
price of the Combined  Product by the fraction of a/(a+b),  where a is the total
market  price of the  Licensed  Product  if sold  separately  and b is the total
market price of any other  product or component in the Combined  Product if sold
separately.  If the  Licensed  Product or any other  component or product in the
Combined  Product  are not sold  separately,  the Net Sales  price  upon which a
royalty is paid shall be: (a) the  market  price at which the  Licensed  Product
reasonably could be sold as a separate item, which may be used as a in the above
fraction in this paragraph to calculate  earned royalty if the Licensed  Product
is the only  component of the Combined  Product not sold as a separate  item; or
(b) Net Sales price of the Combined Product  multiplied by a factor of I/x where
x is the number of active  components or  ingredients  contained in the Combined
Product up to a maximum of x = 3.

                                       -9-


<PAGE>

     7.   PATENT FILING, PROSECUTION, AND MAINTENANCE

          7.01 Except as  otherwise  provided  in this  Article 7, PHS agrees to
take  responsibility  for, but to consult with, the Licensee in the preparation,
filing,  prosecution,  and  maintenance  of any and all patent  applications  or
patents  included in the Licensed  Patent Rights and shall furnish copies of all
patent-related   documents  to  Licensee  or  PHS  shall   instruct  its  patent
representative  to provide  said copies  directly  to  Licensee.  At  Licensee's
request and expense,  PHS shall  cooperate  with Licensee in preparing,  filing,
prosecuting,  and maintaining  such patent  applications and patents included in
the Licensed  Patent  Rights as  reasonably  requested by Licensee  from time to
time. Notwithstanding the foregoing, PHS will retain Principal Power of Attorney
and primary control over the preparation,  filing, prosecution,  and maintenance
of said  patent  applications  and  patents.  PHS shall  provide  Licensee  with
reasonable  opportunity to comment on any document PHS intends to file or causes
to be filed with the relevant patent office.

          7.02  Upon  PHS's   written   request,   Licensee   shall  assume  the
responsibility for the preparation,  filing, prosecution, and maintenance of any
and all patent  applications  or patents  included in the Licensed Patent Rights
and shall on an ongoing  basis  promptly  furnish  copies of all  patent-related
documents to PHS. In such event,  Licensee shall,  subject to the prior approval
of PHS,  select  registered  patent  attorneys or patent  agents to provide such
services on behalf of Licensee and PHS. PHS shall provide  appropriate powers of
attorney and other  documents  necessary to undertake such actions to the patent
attorneys or patent agents  providing such services.  Licensee and its attorneys
or agents  shall  consult  with PHS in all aspects of the  preparation,  filing,
prosecution and maintenance of patent  applications  and patents included within
the Licensed  Patent  Rights and shall  provide PHS  sufficient  opportunity  to
comment on any document  that  Licensee  intends to file or to cause to be filed
with the relevant intellectual property or patent office.

          7.03 At any time,  PHS may provide  Licensee with written  notice that
PHS  wishes to assume  control  of the  preparation,  filing,  prosecution,  and
maintenance  of any and all  patent  applications  or  patents  included  in the
Licensed Patent Rights. If PHS elects to assume such responsibilities,  Licensee
agrees to cooperate fully with PHS, its attorneys and agents in the preparation,
filing,  prosecution,  and  maintenance  of any and all patent  applications  or
patents  included in the Licensed Patent Rights and to provide PHS with complete
copies of any and all documents or other  materials that PHS deems  necessary to
undertake such  responsibilities.  Licensee  shall be responsible  for all costs
associated with transferring patent prosecution  responsibilities to an attorney
or agent of PHS's choice.

          7.04 Each party shall promptly inform the other as to all matters that
come to its attention that may affect the preparation,  filing,  prosecution, or
maintenance  of the  Licensed  Patent  Rights and  permit  each other to provide
comments  and  suggestions  with  respect  to  the  preparation,   filing,   and
prosecution of Licensed Patent Rights,  which comments and suggestions  shall be
considered by the other party.

     8.   RECORD KEEPING

                                      -10-

<PAGE>

          8.01 Licensee  agrees to keep accurate and correct records of Licensed
Products  made,  used,  or sold and  Licensed  Processes  practiced  under  this
Agreement appropriate to determine the amount of royalties due PHS. Such records
shall be  retained  for at least  five (5)  years  following  a given  reporting
period.  They shall be available  during normal business hours for inspection at
the expense of PHS by an accountant or other designated  auditor selected by PHS
for the sole purpose of verifying reports and payments hereunder. The accountant
or auditor  shall only disclose to PHS  information  relating to the accuracy of
reports  and  payments  made under this  Agreement.  If an  inspection  shows an
underreporting  or  underpayment  in excess of five  percent (5%) for any twelve
(12)  month  period,  then  Licensee  shall  reimburse  PHS for the  cost of the
inspection  at the time Licensee pays the  unreported  royalties,  including any
late  charges as required by  Paragraph  9.08 of this  Agreement.  All  payments
required under this  Paragraph  shall be due within thirty (30) days of the date
PHS provides Licensee notice of the payment due.

          8.02  Licensee  agrees to  conduct an  independent  audit of sales and
royalties at least every two years if annual  sales of the  Licensed  Product or
Licensed  Processes  are equal to or greater than two (2) million  dollars.  The
audit shall address, at a minimum,  the amount of gross sales by or on behalf of
Licensee  during the audit  period,  the amount of funds owed to the  Government
under  this  Agreement,  and  whether  the  amount  owed  has  been  paid to the
Government  and is  reflected  in the records of the  Licensee.  A report by the
auditor shall be submitted promptly to PHS on completion. Licensee shall pay for
the entire cost of the audit.

     9.   REPORTS ON PROGRESS, BENCHMARKS, SALES, AND PAYMENTS

          9.01 Prior to Signing this Agreement, Licensee has provided to PHS the
Commercial Development Plan at Appendix F, under which Licensee intends to bring
the  subject  matter of the  Licensed  Patent  Rights to the point of  Practical
Application.   This  Commercial  Development  Plan  is  hereby  incorporated  by
reference into this Agreement.  Based on this plan,  performance  Benchmarks are
determined as specified in Appendix E.

          9.02 Licensee  shall  provide  written  annual  reports on its product
development   progress  or  efforts  to   commercialize   under  the  Commercial
Development  Plan for each of the Licensed  Fields of Use within sixty (60) days
after December 31 of each calendar year.  These progress  reports shall include,
but  not be  limited  to:  progress  on  research  and  development,  status  of
applications for regulatory approvals, manufacturing,  sublicensing,  marketing,
and sales during the preceding  calendar  year, as well as plans for the present
calendar year. PHS also encourages  these reports to include  information on any
of  Licensee's  public  service  activities  that relate to the Licensed  Patent
Rights.  If reported  progress  differs from that  projected  in the  Commercial
Development  Plan and  Benchmarks,  Licensee  shall explain the reasons for such
differences.  To the extent such  differences  are not the result of  Licensee's
failure  to perform in  accordance  with the  requirements  of  Paragraph  10.01
hereunder,  Licensee  may  request  to amend  the  Commercial  Development  Plan
accordingly,  approval  of  which by PHS may not  unreasonably  be  denied.  The
parties  recognize and acknowledge  that the Commercial  Development  Plan is an
estimate of the time frames and steps  necessary for development of the Licensed
Product(s).   As  the  profiles  of  the  Licensed  Product(s)and  the  Licensed
Process(es)  become  more fully  understood  by the  parties  hereto,  including
without  limitation,  the  emerging  pharmacologic/toxicologic  profile in human
subjects and technical issues relating to the

                                      -11-

<PAGE>

manufacture  of  Licensed  Product(s),  adjustments  and  modifications  to  the
Commercial  Development  Plan may be  necessary.  In addition,  preclinical  and
clinical work in addition to that noted in the Commercial  Development  Plan may
be  reasonable  or  necessary  in order to satisfy  the FDA or other  regulatory
requirements,  requests,  or  concerns  regarding  the  Licensed  Product(s)  or
Licensed Process(es). In any such annual report, Licensee may propose amendments
to the Commercial Development Plan, acceptance of which by PHS may not be denied
unreasonably.  Licensee agrees to provide any additional  information reasonably
required  by  PHS to  evaluate  Licensee's  performance  under  this  Agreement.
Licensee may amend the  Benchmarks at any time upon written  consent by PHS. PHS
shall not  unreasonably  withhold  approval of any request of Licensee to extend
the time  periods of this  schedule if such request is supported by a reasonable
showing  by  Licensee  of  diligence  in its  performance  under the  Commercial
Development  Plan and toward  bringing  the  Licensed  Products  to the point of
practical  application  as defined in 37 CFR 404.3(d).  Licensee shall amend the
Commercial  Development Plan and Benchmarks at the request of PHS to address any
Licensed  Fields  of Use  not  specifically  addressed  in the  plan  originally
submitted.

          9.03  Licensee  shall  report to PHS the date of the First  Commercial
Sale in each country in the Licensed  Territory  within thirty (30) days of such
occurrence.

          9.04  Licensee  shall  submit to PHS within sixty (60) days after each
calendar half-year ending June 30 and December 31 a royalty report setting forth
for the preceding  half-year period the amount of the Licensed  Products sold or
Licensed Processes  practiced by or on behalf of Licensee in each country within
the Licensed  Territory,  the Net Sales,  and the amount of royalty  accordingly
due. With each such royalty report,  Licensee shall submit payment of the earned
royalties due. If no earned  royalties are due to PHS for any reporting  period,
the written  report  shall so state.  The royalty  report  shall be certified as
correct  by an  authorized  officer  of  Licensee  and shall  include a detailed
listing of all deductions  made under Paragraph 2.10 to determine Net Sales made
under Article 6 to determine royalties due.

          9.05 Licensee  agrees to forward  semi-annually  to PHS a copy of such
reports  received  by  Licensee  from  its  sublicensees  during  the  preceding
half-year  period  as shall  be  pertinent  to a  royalty  accounting  to PHS by
Licensee for activities under the sublicense.

          9.06 Royalties due under Article 6 shall be paid in U.S. dollars.  For
conversion of foreign currency to U.S. dollars, the conversion rate shall be the
New York foreign exchange rate quoted in The Wall Street Journal on the day that
the payment is due. All checks and bank drafts  shall be drawn on United  States
banks and shall be  payable,  as  appropriate,  for FDA or NIH  licenses  to the
National  Institutes  of  Health,  P.O.  Box  360120,  Pittsburgh,  Pennsylvania
15251-6120  or  for  CDC  licenses  to  the  Centers  for  Disease  Control  and
Prevention,  CDC  Financial  Management  Office,  255 East Paces Ferry Road,  NE
(MS-E12),  Atlanta, Georgia 30305. Any loss of exchange,  value, taxes, or other
expenses  incurred in the transfer or conversion  to U.S.  dollars shall be paid
entirely by Licensee.  The royalty  report  required by  Paragraph  9.04 of this
Agreement shall accompany each such payment and a copy of such report shall also
be mailed to PHS at its address for notices  indicated on the Signature  Page of
this Agreement.

                                      -12-

<PAGE>

          9.07 Licensee shall be solely  responsible  for determining if any tax
on royalty  income is owed outside the United  States and shall pay any such tax
and be  responsible  for  all  filings  with  appropriate  agencies  of  foreign
governments.

          9.08 Late charges will be assessed by PHS as  additional  royalties on
any overdue payments at a rate of [REDACTED]* per month compounded monthly.  The
payment of such late  charges  shall not prevent PHS from  exercising  any other
rights it may have as a consequence of the lateness of any payment.

          9.09 All plans  and  reports  required  by this  Article 9 and  marked
"confidential"  by Licensee shall, to the extent permitted by law, be treated by
PHS as  commercial  and  financial  information  obtained  from a person  and as
privileged and confidential  and any proposed  disclosure of such records by the
PHS under the Freedom of  Information  Act, 5 U.S.C.  ss.552 shall be subject to
the predisclosure notification requirements of 45 CFR ss.5.65(d).

          9.10 To the extent permitted by law,  government  regulation,  and PHS
policy, upon Licensee's request,  PHS agrees to provide Licensee with reasonable
documentation  requested  by Licensee  in PHS's  possession  regarding  Licensed
Patent  Rights  in  Licensed  Fields of Use.  To the  extent  permitted  by law,
government  regulation,  and PHS  policy,  PHS agrees to provide  Licensee  with
copies of and full access to any  Investigational  New Drug Application  ("IND")
PHS files with the FDA for clinical studies  utilizing  Licensed  Product(s) and
Licensed Process(es) within the Licensee's Licensed Fields of Use as well as the
fight  to  cross-reference  any IND  that PHS  files  with the FDA for  Licensed
Product(s) and Licensed  Process(es) as appropriate.  To the extent permitted by
law, government regulation,  and PHS policy, PHS agrees to provide Licensee with
reasonable  documentation,  if any, requested by Licensee to allow Licensee such
access or  cross-filing  as appropriate.  If PHS reasonably  incurs  substantial
expenses  in  producing  such  documents,  Licensee  agrees  to  reimburse  such
expenses.

          9.11 To the extent permitted by law,  government  regulation,  and PHS
policy,  PHS agrees to provide  Licensee  with  copies,  if any, of relevant (1)
Safety Reports for Serious and  Unexpected  Adverse Events (as defined in 21 CFR
312.32(a))  submitted by PHS to FDA in compliance with 21 CFR 312.32 for any IND
that PHS files with  respect to Licensed  Product(s)  and  Licensed  Process(es)
(collectively  referred to as "PHS Licensed Products IND"); and (2) PHS Licensed
Product  IND  Annual  Reports  submitted  by PHS to the FDA  pursuant  to 21 CFR
312.33.

          9.12 Upon request of PHS,  Licensee  agrees to provide the appropriate
PHS  clinical  unit  copies,  if any,  of: (1) Safety  Reports  for  Serious and
Unexpected Adverse Events (as defined in 21 CFR 312.32(a)) submitted by Licensee
to FDA in  compliance  with 21 CFR 312.32 for any IND that  Licensee  files with
respect Licensed Product(s) and Licensed Process(es)  (collectively  referred to
as "Licensee  Licensed  Product  IND");  and (2) Licensee  Licensed  Product IND
Annual Reports submitted by Licensee to the FDA pursuant to 21 CFR 312.33.

    10.   PERFORMANCE


                                      -13-

*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.

<PAGE>

          10.01  Licensee  shall use its  reasonable  best  efforts to bring the
Licensed Products and Licensed Processes to Practical  Application.  "Reasonable
best efforts" for the purposes of this provision shall include  adherence to the
Commercial  Development  Plan at Appendix F and performance of the Benchmarks at
Appendix E as may be amended from time to time by mutual  written  consent.  The
efforts of  Sublicensees  and  Affiliates  shall be  considered  the  efforts of
Licensee. To the extent that the Benchmarks or development obligations set forth
in  Appendix E differ from or  conflict  with those set forth in the  Commercial
Development  Plan in Appendix F,  Appendix E shall be  considered  to  supersede
Appendix F and the Plan to be so amended.

          10.02 Upon the First  Commercial  Sale,  until the  expiration of this
Agreement,  Licensee  shall use its  reasonable  best  efforts to make  Licensed
Products and  Licensed  Processes  reasonably  accessible  to the United  States
public.

    11.   INFRINGEMENT AND PATENT ENFORCEMENT

          11.01 PHS and  Licensee  agree to notify  each other  promptly of each
infringement or possible  infringement of the Licensed Patent Rights, as well as
any facts  which may  affect  the  validity,  scope,  or  enforceability  of the
Licensed Patent Rights of which either Party becomes aware.

          11.02  Pursuant to this  Agreement and the provisions of Chapter 29 of
title 35, United States Code, Licensee may a) bring suit in its own name, at its
own expense,  and on its own behalf for  infringement of presumably valid claims
in the Licensed  Patent Rights;  b) in any such suit,  enjoin  infringement  and
collect for its use, damages, profits, and awards of whatever nature recoverable
for such  infringement;  and c) settle any claim or suit for infringement of the
Licensed Patent Rights provided,  however,  that PHS and appropriate  Government
authorities shall have the first right to take such actions. If Licensee desires
to  initiate  a suit for  patent  infringement,  Licensee  shall  notify  PHS in
writing.  If PHS does not notify  Licensee of its intent to pursue  legal action
within ninety (90) days,  Licensee will be free to initiate suit. PHS shall have
a continuing  right to intervene in such suit.  Licensee shall take no action to
compel the Government  either to initiate or to join in any such suit for patent
infringement.  Licensee  may request the  Government  to initiate or join in any
such suit if necessary to avoid dismissal of the suit.  Should the Government be
made a party to any such suit,  Licensee shall  reimburse the Government for any
costs,  expenses, or fees which the Government incurs as a result of such motion
or other  action,  including  any and all costs  incurred by the  Government  in
opposing any such motion or other action.  Upon Licensee's  payment of all costs
incurred by the  Government  as a result of Licensee's  joinder  motion or other
action,  these  actions  by  Licensee  will not be  considered  a default in the
performance  of any  material  obligation  under this  Agreement.  In all cases,
Licensee  agrees to keep PHS  reasonably  apprised of the status and progress of
any litigation. Before Licensee commences an infringement action, Licensee shall
notify  PHS  and  give  careful  consideration  to the  views  of PHS and to any
potential  effects of the litigation on the public health in deciding whether to
bring suit.  Should the Government be made a party to any such suit by motion or
any other action of Licensee,  Licensee  shall  reimburse the Government for any
costs,  expenses, or fees which the Government incurs as a result of such motion
or other action.

                                      -14-

<PAGE>

          11.03  In  the  event  that a  declaratory  judgment  action  alleging
invalidity/or  non-infringement  of any of the Licensed  Patent  Rights shall be
brought against Licensee or raised by way of counterclaim or affirmative defense
in an infringement  suit brought by Licensee under Paragraph 11.02,  pursuant to
this  Agreement and the provisions of Chapter 29 of Title 35, United States Code
or other  statutes,  Licensee may a) defend the suit in its own name, at its own
expense,  and on its own  behalf for  presumably  valid  claims in the  Licensed
Patent Rights;  b) in any such suit,  ultimately to enjoin  infringement  and to
collect for its use, damages, profits, and awards of whatever nature recoverable
for such infringement;  and c) settle any claim or suit for declaratory judgment
involving the Licensed Patent Rights-provided, however, that PHS and appropriate
Government authorities shall have the first right to take such actions and shall
have a  continuing  right to  intervene  in such  suit.  If PHS does not  notify
Licensee of its intent to respond to the legal action within a reasonable  time,
Licensee  will be free to do so.  Licensee  shall  take no action to compel  the
Government  either  to  initiate  or to join in any  such  declaratory  judgment
action. Licensee may request the Government to initiate or to join any such suit
if necessary to avoid  dismissal of the suit.  Should the  Government  be made a
party to any such suit by motion or any other action of Licensee, Licensee shall
reimburse the Government for any costs,  expenses,  or fees which the Government
incurs as a result of such motion or other action.  Upon  Licensee's  payment of
all costs incurred by the Government as a result of Licensee's joinder motion or
other action,  these actions by Licensee will not be considered a default in the
performance of any material obligation under this Agreement.  If Licensee elects
not to defend against such declaratory  judgment action, PHS, at its option, may
do so at its own expense.  In all cases,  Licensee agrees to keep PHS reasonably
apprised of the status and progress of any litigation. Before Licensee commences
an infringement action, Licensee shall notify PHS and give careful consideration
to the views of PHS and to any potential effects of the litigation on the public
health in deciding whether to bring suit.

          11.04 In any action  under  Paragraphs  11.02 or 11.03,  the  expenses
including  costs,  fees,  attorney  fees,  and  disbursements,  shall be paid by
Licensee.  Up to  [REDACTED]*  of such  expenses  may be  credited  against  the
royalties  payable to PHS under  Paragraph 6.03 under the Licensed Patent Rights
in the country in which such a suit is filed.  In the event that  [REDACTED]* of
such expenses exceed the amount of royalties payable by Licensee in any calendar
year,  the  expenses in excess may be carried over as a credit on the same basis
into succeeding calendar years. A credit against litigation  expenses,  however,
may not reduce the  royalties  due in any calendar year to less than the minimum
annual  royalty.  Any  recovery  made by  Licensee,  through  court  judgment or
settlement,  first shall be applied to reimburse PHS for royalties withheld as a
credit  against  litigation  expenses  and then to  reimburse  Licensee  for its
litigation expense. [REDACTED]*.

          11.05 PHS shall  cooperate  fully with Licensee in connection with any
action under Paragraphs 11.02 or 11.03. PHS agrees promptly to provide access to
all  necessary  documents and to render  reasonable  assistance in response to a
request by Licensee.

    12.   NEGATION OF WARRANTIES AND INDEMNIFICATION

          12.01 PHS offers no warranties  other than those  specified in Article
1.


                                      -15-

*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.

<PAGE>

          12.02 PHS does not warrant the validity of the Licensed  Patent Rights
and makes no representations whatsoever with regard to the scope of the Licensed
Patent  Rights,  or that the Licensed  Patent  Rights may be  exploited  without
infringing other patents or other intellectual property rights of third parties.

          12.03   PHS   MAKES  NO   WARRANTIES,   EXPRESSED   OR   IMPLIED,   OF
MERCHANTABILITY  OR  FITNESS  FOR A  PARTICULAR  PURPOSE OF ANY  SUBJECT  MATTER
DEFINED BY THE CLAIMS OF THE LICENSED PATENT RIGHTS.

          12.04  PHS does not  represent  that it will  commence  legal  actions
against third parties infringing the Licensed Patent Rights.

          12.05 Licensee shall indemnify and hold PHS, its employees,  students,
fellows,  agents, and consultants (the "Indemnified  Parties") harmless from and
against all liability, demands, damages, expenses, and losses, including but not
limited to death, personal injury, illness, or property damage (the "indemnified
Losses")  suffered by an Indemnified  Party in connection with or arising out of
a) the use by or on  behalf  of  Licensee,  its  Affiliates,  its  sublicensees,
directors,  employees, or third parties of any Licensed Patent Rights, or b) the
design,  manufacture,  distribution,  or use of any Licensed Products,  Licensed
Processes or materials by Licensee,  or other products or processes developed in
connection with or arising out of the Licensed Patent Rights. Licensee agrees to
maintain a liability  insurance program consistent with sound business practice.
Notwithstanding  any other  provision to the  contrary,  Licensee  shall have no
obligation  to  indemnify  and  hold  the  Indemnified   Parties  harmless  from
Indemnified  Losses in  connection  with or arising  out of: a) the use by or on
behalf  of the  indemnified  Parties  of any  Licensed  Product(s)  or  Licensed
Process(es), or b) the design, manufacture,  distribution or use of any Licensed
Products or Licensed Processes by or on behalf of the Indemnified Parties.

    13.   TERM, TERMINATION, AND MODIFICATION OF RIGHTS

          13.01 This Agreement is effective when signed by all parties and shall
extend on a country by country basis to the  expiration of the last to expire of
the Licensed Patent Rights in each respective  country unless sooner  terminated
as provided in this Article 13.

          13.02 In the event that Licensee is in default in the  performance  of
any material obligations under this Agreement,  including but not limited to the
obligations  listed in Article  13.05,  and if the default has not been remedied
within ninety (90) days after the date of notice in writing of such default, PHS
may terminate this Agreement by written notice.

          13.03 in the event that Licensee becomes  insolvent,  files a petition
in  bankruptcy,  has such a petition  filed  against  it,  determines  to file a
petition in bankruptcy,  or receives notice of a third party's intention to file
an involuntary petition in bankruptcy,  Licensee shall immediately notify PHS in
writing.

          13.04  Licensee  shall  have a  unilateral  right  to  terminate  this
Agreement  and/or  any  licenses  in any  country  by giving PHS sixty (60) days
written notice to that effect.

                                      -16-

<PAGE>

          13.05 PHS shall specifically have the right to terminate or modify, at
its option,  this  Agreement,  if PHS determines that the Licensee acting on its
own or through its agents:  1) is not executing the Commercial  Development Plan
submitted  with its  request  for a license and the  Licensee  cannot  otherwise
demonstrate to PHS's reasonable satisfaction that the Licensee has taken, or can
be  expected  to take  within a  reasonable  time,  effective  steps to  achieve
Practical Application of the Licensed Products or Licensed Processes; 2) has not
achieved  the  Benchmarks  as may  be  modified  under  Paragraph  9.02;  3) has
willfully made a false  statement of, or willfully  omitted,  a material fact in
the license  application or in any report required by the license agreement;  4)
has  committed a material  breach of a covenant or  agreement  contained  in the
license;  5) is not keeping Licensed Products or Licensed  Processes  reasonably
available to the public after  commercial  use commences;  6) cannot  reasonably
satisfy unmet health and safety needs; or 7) cannot reasonably justify a failure
to comply with the domestic  production  requirement  of  Paragraph  5.02 unless
waived.  In making  this  determination,  PIE will take into  account the normal
course  of  such  commercial  development  programs  conducted  with  sound  and
reasonable  business  practices and judgment and the annual reports submitted by
Licensee  under  Paragraph  9.02.  Prior to invoking this right,  PHS shall give
written notice to Licensee  providing  Licensee specific notice of, and a ninety
(90) day  opportunity  to respond to, PHS's concerns as to the previous items 1)
to 7). If Licensee fails to alleviate PHS's concerns as to the previous items 1)
to 7) or fails to initiate  corrective action to PHS's reasonable  satisfaction,
PIE may terminate this Agreement.

          13.06 When the public health and safety so require,  and after written
notice to Licensee  providing  Licensee a sixty (60) day opportunity to respond,
PHS shall have the right to require Licensee to grant sublicenses to responsible
applicants,  on  reasonable  terms,  in any  Licensed  Fields  of Use  under the
Licensed  Patent Rights,  unless  Licensee can reasonably  demonstrate  that the
granting of the sublicense would not materially increase the availability to the
public of the subject matter of the Licensed Patent Rights. PHS will not require
the  granting  of a  sublicense  unless  the  responsible  applicant  has  first
negotiated in good faith with Licensee.

          13.07 PHS reserves the right  according to 35 U.S.C.  ss.209(f)(4)  to
terminate  or modify  this  Agreement  if it is  determined  that such action is
necessary to meet  requirements for public use specified by federal  regulations
issued after the date of the license and such  requirements  are not  reasonably
satisfied by Licensee.

          13.08  Within  thirty  (30) days of receipt of written  notice of PHS'
unilateral  decision  to modify  or  terminate  this  Agreement,  Licensee  may,
consistent with the provisions of 37 CFR 404.11,  appeal the decision by written
submission to the  designated  PHS official.  The decision of the designated PHS
official shall be the final agency  decision.  Licensee may thereafter  exercise
any and all administrative or judicial remedies that may be available.

          13.09 Within ninety (90) days of termination  of this Agreement  under
this  Article 13 or  expiration  under  Paragraph  3.02, a final report shall be
submitted by Licensee.  Any royalty payments,  including those related to patent
expense, due to PHS shall become immediately due and payable upon termination or
expiration.  If  terminated  under this  Article 13,  sublicensees  may elect to
convert  their  sublicenses  to direct  licenses  with PHS pursuant to Paragraph
4.03.

                                      -17-

<PAGE>

    14.   GENERAL PROVISIONS

          14.01  Neither  Party  may  waive  or  release  any of its  rights  or
interests in this Agreement except in writing. The failure of either Licensee or
the Government to assert a right hereunder or to insist upon compliance with any
term or condition of this Agreement  shall not constitute a waiver of that right
by either party or excuse a similar  subsequent failure to perform any such term
or condition by either party.

          14.02 This  Agreement  constitutes  the entire  agreement  between the
Parties  relating to the subject matter of the Licensed  Patent Rights,  and all
prior negotiations,  representations,  agreements, and understandings are merged
into, extinguished by, and completely expressed by this Agreement.

          14.03 The provisions of this Agreement are severable, and in the event
that any  provision  of this  Agreement  shall be  determined  to be  invalid or
unenforceable  under any controlling body of law such determination shall not in
any way affect the validity or  enforceability  of the  remaining  provisions of
this Agreement.

          14.04 If either Party desires a modification  to this  Agreement,  the
Parties shall, upon reasonable notice of the proposed  modification by the Party
desiring the change,  confer in good faith to determine the desirability of such
modification.  No modification  will be effective  until a written  amendment is
signed by the signatories to this Agreement or their designees.

          14.05 The  construction,  validity,  performance,  and  effect of this
Agreement  shall be governed by Federal law as applied by the Federal  courts in
the District of Columbia.

          14.06 All notices  required or  permitted by this  Agreement  shall be
given by prepaid, first class,  registered or certified mail, or by a recognized
express/overnight  delivery service  provider,  properly  addressed to the other
Party at the address  designated  on the  following  Signature  Page, or to such
other address as may be designated in writing by such other Party,  and shall be
effective as of the date of the postmark or verifiable dispatch of such notice.

          14.07 This Agreement  shall not be assigned by Licensee except a) with
the prior written consent of PHS, such consent not to be withheld  unreasonably;
or b) as part of a sale or  transfer  of  substantially  the entire  business of
Licensee  relating to operations  which concern this Agreement which  assignment
shall not require the prior consent of PHS. Licensee shall notify PHS within ten
(10) days of any assignment of this Agreement by Licensee.

          14.08  Licensee  agrees in its use of any  PHS-supplied  materials  to
comply with all applicable  statutes,  regulations,  and  guidelines,  including
Public  Health  Service  and  National  Institutes  of  Health  regulations  and
guidelines.  Licensee  agrees not to use the  materials  for research  involving
human subjects or clinical trials in the United States without complying with 21
CFR Part 50 and 45 CFR Part 46.  Licensee  agrees not to use the  materials  for
research  involving  human  subjects  or clinical  trials  outside of the United
States  without  notifying  PHS,  in  writing,  of such  research  or trials and
complying with the applicable  regulations of the appropriate  national  control
authorities. Written notification to PHS of research involving human subjects or
clinical

                                      -18-

<PAGE>

trials outside of the United States shall be given no later than sixty (60) days
prior to commencement of such research or trials.

          14.09 Licensee  acknowledges that it is subject to and agrees to abide
by the United States laws and regulations  (including the Export  Administration
Act of 1979 and Arms Export  Control  Act)  controlling  the export of technical
data, computer software,  laboratory prototypes,  biological material, and other
commodities. The transfer of such items may require a license from the cognizant
Agency of the U.S.  Government  or written  assurances by Licensee that it shall
not export such items to certain  foreign  countries  without prior  approval of
such  agency.  PHS neither  represents  that a license is or is not  required or
that, if required, it shall be issued.

          14.10 Licensee agrees to mark the Licensed Products or their packaging
sold in the United States with all applicable  U.S. patent numbers and similarly
to indicate  "Patent  Pending" status.  All Licensed  Products  manufactured in,
shipped  to, or sold in other  countries  shall be marked in such a manner as to
preserve PHS patent rights in such countries, if any.

          14.11 By  entering  into  this  Agreement,  PHS does not  directly  or
indirectly  endorse  any  product or service  provided,  or to be  provided,  by
Licensee  whether  directly or indirectly  related to this  Agreement.  Licensee
shall  not  state  or  imply  that  this  Agreement  is an  endorsement  by  the
Government,  PHS, any other  Government  organizational  unit, or any Government
employee.  Additionally,  Licensee  shall not use the names of NHI, CDC, PHS, or
DHS or the Government or their  employees in any  advertising,  promotional,  or
sales literature  without the prior written consent of PHS, except that Licensee
may publicly identify the existence of this Agreement and is not prohibited from
using  publicly  available  factual  information  regarding the Licensed  Patent
Rights,  Licensed Products, and Licensed Processes specifically  including,  but
not limited to, the names of the  inventors  as appears on the  Licensed  Patent
Rights and their associated NIH institutes, without such consent.

          14.12 The Parties agree to attempt to settle  amicably any controversy
or claim arising under this Agreement or a breach of this Agreement,  except for
appeals of  modifications or termination  decisions  provided for in Article 13.
Licensee agrees first to appeal any such unsettled  claims or  controversies  to
the designated PHS official, or designee, whose decision shall be considered the
final agency decision.  Thereafter,  Licensee may exercise any administrative or
judicial remedies that may be available.

          14.13  Nothing  relating  to the  grant of a  license,  nor the  grant
itself,  shall be  construed  to confer  upon any  person any  immunity  from or
defenses  under the antitrust  laws or from a charge of patent  misuse,  and the
acquisition and use of rights pursuant to 37 CFR Part 404 shall not be immunized
from the operation of state or Federal law by reason of the source of the grant.

          14.14 Paragraphs 4.03, 8.01, 9.06-9.08, 12.01-12.05, 13.08, 13.09, and
14.12 of this Agreement shall survive termination of this Agreement.

          14.15 Upon  termination  or expiration of this  Agreement by Licensee,
Licensee and any Sublicensee or Affiliate shall be entitled to sell any Licensed
Products manufactured prior

                                      -19-

<PAGE>

to the date of such  termination  or expiration  for up to an additional six (6)
month period subject to the obligations of Article 6, 8, and 9.

          14.16 To the extent permitted by law, government  regulation,  and PHS
policy,  PHS agrees to maintain in confidence and not disclose any  confidential
information  provided by Licensee to PHS under this  Agreement  or the terms and
conditions  of  this   Agreement.   Licensee  will  mark  such   information  as
confidential.

                          SIGNATURES BEGIN ON NEXT PAGE


                                      -20-

<PAGE>


                     PHS PATENT LICENSE AGREEMENT--EXCLUSIVE

                                 SIGNATURE PAGE



For PHS:


/s/ BARBARA MCGAREY                                              4/19/96
- -----------------------------------------------                  ---------------
Barbara McGarey, J.D.                                              Date
Deputy Director, Office of Technology Transfer
National Institutes of Health


Mailing Address for Notices:

Office of Technology Transfer
National Institutes of Health
6011 Executive Boulevard, Suite 325
Rockville, Maryland  20852
Fax:  (301) 402-0220


For Licensee (Upon,  information and belief, the undersigned expressly certifies
or affirms that the contents of any  statements  of Licensee made or referred to
in this document are truthful and accurate.):


by:


/s/ MARK A. CULHANE                                              4/9/96
- -----------------------------------------------                  ---------------
Signature of Authorized Official                                      Date

Mark A. Culhane
- -----------------------------------------------
Printed Name

Chief Financial Officer
- -----------------------------------------------                  ---------------
Title

Mailing Address for Notices:

SciClone Pharmaceuticals
901 Mariners Island Blvd.
San Mateo, CA  94404


                                      -21-

<PAGE>



                  APPENDIX A-Patent(s) or Patent Application(s)




Patent(s) or Patent Application(s):

For U.S. Patent No. 5,366,977, issued on November 22, 1994, entitled `Methods of
Treating  Cystic Fibrosis Using  8-Cyclopentyl-l,3-Dipropylxanthine  or Xanthine
Amino Congeners".

For U.S.  Patent  Application  Serial No.  08/343,714,  filed November 22, 1994,
entitled "A Method of Identifying  CFTR-Binding  Compounds Useful for Activating
Chloride  Conductance  in  Animal  Cells",  including  its PCT  counterpart  PCT
International Application No. PCT/US95/14345.



<PAGE>



                 APPENDIX B-Licensed Fields of Use and Territory




Licensed Fields of Use:



For U.S. Patent No. 5,366,977,  exclusively for the treatment of cystic fibrosis
in humans comprising the administration of 8-cyclopentyl-1,  3-clipropylxanthine
or xanthine amino congeners.

For U.S. Patent Application  Serial No. 08/343,714,  exclusively for therapeutic
and diagnostic  uses for the Class of Compounds  claimed for cystic  fibrosis in
humans.

For U.S. Patent Application  Serial No. 08/343,714,  exclusively for therapeutic
and diagnostic uses for the Class of Compounds  claimed for human diseases other
than  cystic  fibrosis,  conditionally  for  twenty-four  (24)  months  from the
Effective   Date,  as  set  forth  in  Appendix  E.  Excluded   fields   include
noncommercial internal research uses, such as screening, and research reagents.

For U.S. Patent Application  Serial No.  08/343,714,  nonexclusively for methods
for identifying CFFR-binding compounds.

Licensed Territory:

For U.S. Patent No. 5,366,977, the United States of America and its territories,
possessions, and commonwealths.

For U.S. Patent Application Serial No. 08/343,714,  the United States of America
and  its  territories,   possessions,  and  commonwealths,   and  the  examining
authorities and countries  identified in the filing papers of the  corresponding
Patent Cooperation Treaty International  Application No. PCT/US95/14345 filed by
PHS in  November  1995,  as  well as any  additional  territories  where  patent
protection is made available to PHS and sought by PHS for this application.



<PAGE>

                              APPENDIX C-Royalties


Royalties:

Licensee  agrees  to pay to PHS a  noncreditable,  nonrefundable  license  issue
royalty  in  the  amount  of  [REDACTED]*  according  to the  following  payment
schedule;

          A.   [REDACTED]* within [REDACTED]* from the Effective Date;

          B.   [REDACTED]* within [REDACTED]* from the Effective Date; and

          C.   [REDACTED]* within [REDACTED]* from the Effective Date.

Licensee  agrees to pay to PHS a  nonrefundable  minimum  annual  royalty in the
amount of [REDACTED]*.

The first minimum annual royalty shall be due and payable on [REDACTED]* for the
[REDACTED]*. Subsequent minimal annual royalty payments shall be due and payable
as set forth in Paragraph  6.02. Once a Licensed  Product  becomes  commercially
available,  Licensee agrees to pay to PHS a nonrefundable minimum annual royalty
in the amount of [REDACTED]*.

Licensee agrees to pay PHS earned royalties on Net sales as follows:

          A)   [REDACTED]*  of Net  Sales by  Licensee  or an  Affiliate  on all
Licensed Products manufactured and sold in the Licensed Territory; and

          B)   Licensee  shall be entitled to a [REDACTED]*  credit  against the
earned  royalty rate for each  [REDACTED]*  of royalty in excess of  [REDACTED]*
Licensee must pay to other  unaffiliated  licensors for the manufacture and sale
of Licensed Products. Said reduction, however, shall not reduce the royalty rate
for Licensed Products below  [REDACTED]* the rate provided for under Paragraph A
above.

          C)   With  respect to U.S. Patent No.  5,356,977,  no royalty shall be
due for  products  sold for use  outside  the United  States,  its  territories,
possessions,  and commonwealths and not reintroduced into the United States, its
territories, possessions, and commonwealths.

Licensee agrees to pay PHS Sublicensing Royalties as follows:

     Licensee  agrees to pay PHS [REDACTED]* of any cash consideration  received
by Licensee from each sublicensee,  including,  without  limitation,  Licensee's
sublicensee royalty revenue and consideration received in granting a sublicense,
but excluding net proceeds of sublicensee equity purchases.

     With  respect to U.S.  Patent No.  5,355,977,  no royalty  shall be due for
products sold for use outside the United States,  its territories,  possessions,
and commonwealths and not reintroduced into the United States,  its territories,
possessions, and commonwealths.

Licensee agrees to pay PHS benchmark royalties:

*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.

<PAGE>


     - [REDACTED]*  within  [REDACTED]*  upon Licensee's  submission to the U.S.
Food and Drug  Administration  (FDA) of each New Drug  Application  (NDA) to the
Licensed Products in the Licensed Fields of Use.

     -  [REDACTED]*  within  [REDACTED]*  after  each FDA  approval  of each NDA
submitted to the FDA for the Licensed Products in the Licensed Fields of Use.


*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.


<PAGE>

                            APPENDIX D-Modifications


Modifications to the Articles and Paragraphs of this Agreement,  as agreed to by
PHS and Licensee, have been incorporated into the text of this Agreement.



<PAGE>

                      APPENDIX E-Benchmarks and Performance


Licensee  agrees to the  following  Benchmarks  for its  performance  under this
Agreement and,  within  [REDACTED]*  of achieving a Benchmark,  shall notify PHS
that the Benchmark has been achieved.

For U.S.  Patent No.  5,366,977,  entitled  "Methods of Treating Cystic Fibrosis
Using    8-Cyclopentyl-1,3-Dipropylxanthine   or   Xanthine   Amino   Congeners'
exclusively for the treatment of cystic fibrosis:

     1.   Initiate   [REDACTED]*  for  [REDACTED]*  within  [REDACTED]*  of  the
          Effective Date.

     2.   Initiate   [REDACTED]*  for  [REDACTED]*  within  [REDACTED]*  of  the
          Effective Date.

     3.   Initiate   [REDACTED]*  for  [REDACTED]*  within  [REDACTED]*  of  the
          Effective Date.

     4.   [REDACTED]*  approved by the FDA within  [REDACTED]*  of the Effective
          Date.

For U.S.  Patent  Application  Serial No.  08/343,714,  filed November 22, 1994,
entitled "A Method of Identifying  CFTR-Binding  Compounds Useful for Activating
Chloride  Conductance  in  Animal  Cells"  exclusively  for  the  treatment  and
diagnosis of cystic fibrosis in humans:

     A [REDACTED]* for  [REDACTED]*  under this patent  application  [REDACTED]*
(which may be amended by the mutual consent of PHS and Licensee),  otherwise the
[REDACTED]* under U.S. Patent  Application Serial No. 08/343,714 is [REDACTED]*;
and  [REDACTED]*  for a [REDACTED]*  under this patent  application  [REDACTED]*
(which  may be amended by the  mutual  consent of PHS and  Licensee),  otherwise
[REDACTED]* under U.S. Patent Application Serial No. 08/343,714 is [REDACTED]*.

For U.S.  Patent  Application  Serial No.  08/343,714,  filed November 22, 1994,
entitled "A Method of Identifying  CFTR-Binding  Compounds Useful for Activating
Chloride  Conductance in Cells" exclusively for the Class of Compounds disclosed
for  therapeutic  and  diagnostic  uses for human  diseases  other  than  cystic
fibrosis  conditionally  for a  period  of  twenty-four  (24)  months  from  the
Effective Date, subject to the benchmarks recited below:

     1.   A  [REDACTED]*  must be submitted to PHS within  [REDACTED]*  from the
Effective  Date,  PHS will notify  Licensee  in writing  within  [REDACTED]*  of
receipt as to whether the [REDACTED]*  submitted is  satisfactory.  In the event
that PHS does not notify Licensee  within said  [REDACTED]*  period,  Licensee's
[REDACTED]* will be deemed  satisfactory.  If PHS determines this [REDACTED]* to
be  unsatisfactory,  Licensee  will be notified  in writing of any  deficiencies
(hereinafter  "first notice') and Licensee will have one continuous  [REDACTED]*
period  from said first  notice to remedy  any  deficiencies.  This  [REDACTED]*
period is nonextendable.

     2.   A [REDACTED]* which Licensee elects to pursue, which applications have
not yet been  addressed  by  then-current  [REDACTED]*,  must be received by PHS
within  [REDACTED]*  from the  Effective  Date,  subject  to the  provisions  of
paragraphs 4 and 5 below.  PHS will notify Licensee in writing as to whether the
[REDACTED]*  submitted are acceptable  satisfactory  or  unsatisfactory.  If the
[REDACTED]* submitted are

*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.

<PAGE>

unsatisfactory,  Licensee will have a  [REDACTED]*  period from the date of such
notification to remedy any  deficiencies.  In the event that no agreement can be
reached between PHS and Licensee within this [REDACTED]* period (or as otherwise
agreed between PHS and Licensee), [REDACTED]*.

     3. Within  [REDACTED]*  of the  Effective  Date of this  agreement,  if PHS
[REDACTED]*,   and   [REDACTED]*   within   [REDACTED]*  of  being  notified  of
[REDACTED]*, Licensee agrees to negotiate in good faith with [REDACTED]*. In the
event that no agreement can be reached between  Licensee and [REDACTED]*  within
this  [REDACTED]*  period (or as  otherwise  agreed  between PHS and  Licensee),
[REDACTED]*.

     4. Within  [REDACTED]*  of the  Effective  Date of this  agreement,  if PHS
[REDACTED]*,  PHS may notify Licensee in writing of its belief,  documenting the
scientific basis for its belief and that  [REDACTED]*.  If Licensee  [REDACTED]*
within [REDACTED]* of PHS's notice in a manner acceptable to PHS to [REDACTED]*.

For U.S.  Patent  Application  Serial No.  08/343,714,  filed November 22, 1994,
entitled "A Method of Identifying  CFTR-Binding  Compounds Useful for Activating
Chloride  Conductance in Cells",  under the nonexclusive terms of this agreement
for  U.S.  Patent  Application  Serial  No.  08/343,714,  Licensee  will  screen
[REDACTED]*, as agreed to by PHS and Licensee, per [REDACTED]*.


*CONFIDENTIAL  TREATMENT  REQUESTED.  OMITTED PORTION FILED  SEPARATELY WITH THE
 COMMISSION.


<TABLE> <S> <C>


<ARTICLE>                     5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-START>                                 APR-01-1996
<PERIOD-END>                                   JUN-30-1996
<CASH>                                          6,090,453
<SECURITIES>                                   36,274,156
<RECEIVABLES>                                   1,744,541
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<DEPRECIATION>                                   (574,547)
<TOTAL-ASSETS>                                 49,167,753
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                                   0
                                             0
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<CGS>                                             403,460
<TOTAL-COSTS>                                     403,460
<OTHER-EXPENSES>                                8,741,521
<LOSS-PROVISION>                                        0
<INTEREST-EXPENSE>                                      0
<INCOME-PRETAX>                                (7,468,159)
<INCOME-TAX>                                         (800)
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<DISCONTINUED>                                          0
<EXTRAORDINARY>                                         0
<CHANGES>                                               0
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<EPS-PRIMARY>                                       (0.43)
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</TABLE>


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