SPARTA PHARMACEUTICALS INC
10-Q, 1996-05-15
PHARMACEUTICAL PREPARATIONS
Previous: AVECOR CARDIOVASCULAR INC, 10-Q, 1996-05-15
Next: VTEL CORP, 10-Q, 1996-05-15





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

                                    FORM 10-Q

(Mark One)

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934.  For the Quarterly Period Ended: 
      March 31, 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 
                                     0-23076

                           Sparta Pharmaceuticals, Inc.                         
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)
                                                                  
                                                                        
                                                                                
                                                                                
   
       Delaware                                           56-1755527            
- ------------------------------------       -------------------------------------
  (State of incorporation)                   (IRS Employer Identification No.)
  

             111 Rock Rd.                         Horsham, PA 19044             
- --------------------------------------------------------------------------------
          (Address of principal executive offices, including zip code)


                                 (215) 442-1700
               ---------------------------------------------------
              (Registrant's telephone number, including area code)

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 May 10, 1996, there were outstanding 8,190,931 shares of Common Stock,
$.001 par value per share.


                                        1

<PAGE>

                                    FORM 10-Q

                                QUARTERLY REPORT

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

                                TABLE OF CONTENTS


Part I.    FINANCIAL INFORMATION

      Item 1. Financial Statements:
              Balance Sheets (Unaudited) as of March 31, 1996 and 
                December 31, 1995                                          3
              Statements of Operations (Unaudited) for the 
                three-month periods ended March 31, 1996 and 1995
                and for the period from June 12, 1990 (inception) 
                to March 31, 1996                                          4
              Statements of Cash Flows (Unaudited) for the 
                three-month periods ended March 31, 1996 and 
                1995 and for the period from June 12, 1990 
                (inception) to March 31, 1996                              5
           Notes to Financial Statements                                   6

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


Part II.   OTHER INFORMATION

      Item 1. Legal Proceedings                                           11

      Item 2. Changes in Securities                                       11

      Item 3. Defaults Upon Senior Securities                             11

      Item 4. Submission of Matters to a Vote of Security Holders         11

      Item 5. Other Information                                           11

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


SIGNATURES                                                                17


                                       2

<PAGE>



                                         SPARTA PHARMACEUTICALS, INC.
                                         (A Development Stage Company)
                                                Balance Sheets
                                                  (Unaudited)  
<TABLE>
<CAPTION>
                                                                  March 31,                 December 31,
Assets                                                              1996                         1995      
                                                              ----------------            -----------------
<S>                                                           <C>                        <C>
Current assets:
  Cash and cash equivalents                                     $2,697,862                   $734,296
  Prepaid expenses and other assets                                147,531                    180,125
                                                                   -------                    -------
Total current assets                                             2,845,393                    914,421

Property, plant & equipment,net                                    580,025                     21,102
Other assets:
  License agreements, net of amortization 
    of $56,002 in 1996 and $50,345 in 1995                          58,786                     64,443
    Restricted Cash                                                247,349                       ----
                                                                   -------               ------------
Total assets                                                    $3,731,553                   $999,966
                                                                ==========                   ========
Liabilities and shareholders' equity
Current liabilities:
  Accounts payable and accrued expenses                           $393,433                   $185,861
                                                                  --------                   --------
Total current liabilities                                          393,433                    185,861

Shareholders' equity :
  Series A Convertible preferred stock, $.001  par value;
     authorized 330,000 shares;  issued and outstanding                300                        ---
     300,000 shares in 1996 and 0 in 1995.
  Series B Convertible Preferred Stock, $.001 par value;
    authorized and unissued 1,000,000 shares                           ---                        ---
  Series C Convertible Preferred Stock, $.001 par value;
    authorized and unissued 125,000 shares                             ---                        ---
  Preferred Stock, not designated, $.001 par value;
    authorized and unissued 9,875,000 shares                           ---                        ---
  Common Stock, $.001 par value; authorized 22,000,000 
    shares; issued and outstanding 8,185,931 shares in
    1996 and 6,185,931 shares in 1995                                8,186                      6,186
  Additional paid-in capital                                    17,200,604                 10,825,375
 Deficit accumulated during the development stage             (13,667,017)               (10,017,456)
 Deferred compensation                                           (203,953)                        ---
                                                                 ---------              -------------
Total shareholders' equity                                       3,338,120                    814,105
                                                                 ---------                  ---------
Total liabilities and shareholders' equity                      $3,731,553                   $999,966
                                                                ==========                  =========
                   The accompanying notes are an integral part of the financial statements.
</TABLE>

                                                  3

<PAGE>


                                         SPARTA PHARMACEUTICALS, INC.
                                        (A Development Stage Company)
                                          Statements of Operations
                                                (Unaudited)
<TABLE>
<CAPTION>
                                                                 
                                                 Three months ended March 31                  
                              ---------------------------------------------------------     Period From
                                                                                           June 12, 1990
                                                                                          (Inception) to
                                   1996                          1995                     March 31, 1996
                                   ----                          ----                     --------------
<S>                          <C>                            <C>                        <C>
Revenue:
  Contract revenue             $-------                       $14,180                         $127,870
  Interest Income                18,713                        45,902                          310,375
                                 ------                        ------                          -------
Total Revenue                    18,713                        60,082                          438,245
                                 ------                        ------                          -------

Operating expenses:                    
  Research and development      292,858                       376,673                        6,297,263
  General and administrative    312,503                       257,572                        4,745,086
Charge for acquired research  
  & development (Note 4)      3,062,913                    ----------                        3,062,913
                              ---------                                                      ---------

Net loss                     $(3,649,561)                  $ (574,163)                    $(13,667,017)
                             ===========                   ===========                    =============


Supplemental net loss 
  per share                   $    ----                    $     ----                          $(2.77)
                                                                                               =======
Historical net loss 
  per share                   $    (.56)                   $     (.09)                         $(3.91)
                              ==========                   ===========                         =======

Supplemental average number
  of shares outstanding 
  (Note 2)                     --------                     ---------                        4,929,544
                                                                                             =========

Historical weighted
 average number of 
 shares outstanding (Note 2)  6,559,557                       6,142,372                      3,494,946
                              =========                  ==============                      =========


                 The accompanying notes are an integral part of the financial statements.

</TABLE>

                                                               4


<PAGE>

                                      SPARTA PHARMACEUTICALS, INC.
                                      (A Development Stage Company)
                                        Statements of Cash Flows
                                               (Unaudited)
<TABLE><CAPTION>
                                                  Three Months ended March 31        Period from June 12
                                                -----------------------------        1990 (Inception) to
                                                   1996              1995              March 31, 1996
                                                -----------       -----------            -----------
<S>                                             <C>             <C>                    <C>
Operating activities:                                                             
Net loss  . . . . . . . . . . . . . . . . .     $(3,649,561)    $    (574,163)          $(13,667,017)
Adjustments to reconcile net loss to net                                          
cash used in operating activities:                                           
      Loss on investments                               ---               ---                   3,316
   Depreciation and amortization  . . . . .          15,314             9,254                 569,463
   Writedown of license agreement   . . . .                                                    45,200
       Acquired research & 
       development (Note 4)   . . . . . . .       3,062,913               ---               3,062,913
   Issuance of convertible notes for       
     services   . . . . . . . . . . . . . .             ---               ---                 220,474
   Issuance of stock for services   . . . .                            19,026                 157,751
   Compensation expense related to stock                                          
   options granted  . . . . . . . . . . . .           2,147               ---                 202,147
   Changes in operating assets and                                                
   liabilities:
    Prepaid expenses and other assets   . .          32,594            11,437               (147,531)
    Accounts payable and accrued expenses             6,730          (132,648)                192,591

                                                -----------       -----------            -----------
Net cash used in operating activities . . .        (529,863)         (667,094)            (9,360,693)

Investing activities:                                                             
Payment of acquisition related fees &               
expenses                                            (80,000)              ---                (80,000)
Purchases of available-for-sale securities                                                (1,103,193)
Maturities of available for sale securities             ---               ---               1,099,877
Purchases of fixed assets . . . . . . . . .                                                  (54,866)
Acquisition of license agreements . . . . .                                                 (160,078)
                                                -----------       -----------            -----------
Net cash used in investing activities . . .         (80,000)              ---               (298,260)

Financing activities:                                                             
Proceeds from issuance of convertible notes                                       
and notes payable . . . . . . . . . . . . .                                                 4,488,650
Repayment of notes payable  . . . . . . . .                                                 (640,000)
Proceeds from issuance of Common Stock  . .           2,000                                 4,914,031
Repurchase of common stock  . . . . . . . .                                                      (45)
Proceeds from issuance of Preferred Stock .       2,571,429                                 4,064,129
Increase in debt issuance costs. . . .  . .                                                  (469,950)
                                                -----------       -----------               ---------
Net cash provided by financing activities .       2,573,429               ---              12,356,815

Increase (Decrease) in cash and cash 
  equivalents . . . . . . . . . . . . . . .       1,963,566          (667,094)              2,697,862

Cash and cash equivalents at beginning of  
period  . . . . . . . . . . . . . . . . . .         734,296         2,348,522                      -
                                                -----------       -----------            -----------
Cash and cash equivalents at end of period       $2,697,862        $1,681,428             $2,697,862
                                                ===========       ===========            ===========
Supplemental disclosures of cash flow                                             
information:
Cash paid during the year for interest  . .             ---               ---               $196,972
                                                ===========       ===========            ===========
Supplemental disclosures of noncash                                               
investing and financing activities:
Conversion of Convertible Notes and Series C                                    
Convertible Preferred Stock into Common                                       
  Stock . . . . . . . . . . . . . . . . . .             ---               ---             $4,086,624
                                                ===========       ===========            ===========

Issuance of Series A Convertible Preferred                                     
Stock for cancellation of notes payable                ---               ---                $200,000
                                                ===========       ===========            ===========


                The accompanying notes are an integral part of the financial statements.
</TABLE>
                                                   5

<PAGE>
                         SPARTA PHARMACEUTICALS, INC.
                         (A Development Stage Company)

                         Notes to Financial Statements
                   For the Three Months Ended March 31, 1996
                                  (Unaudited)

1.   Company Activities and Significant Accounting Policies

     Sparta Pharmaceuticals, Inc. (formerly MediRx Pharmaceuticals, Inc.),
a development stage company incorporated in 1990, is engaged in the
business of acquiring rights to, and developing for commercialization,
technologies and drugs for the treatment of a number of life threatening
diseases, including cancer, cardiovascular disorders and acute
inflammation.

     Basis of Presentation and Financing Activities

     The accompanying financial statements have been prepared on a going
concern basis, which contemplates the realization of assets and the
satisfaction of liabilities in the normal course of business.  The Company
has incurred total net losses of $13,667,017 since inception.  The
Company's continuation as a going concern is dependent upon its ability to
obtain adequate financing.  The Company will require substantial additional
funds to finance its business activities on an ongoing basis and will have
a continuing long-term need to obtain additional financing.  The Company's
future capital requirements will depend on numerous factors, including, but
not limited to, continued progress in its research and development programs
including its preclinical and clinical trials.  The Company plans to engage
in such ongoing financing efforts on a continuing basis.

     The accompanying unaudited interim financial statements have been
prepared in accordance with generally accepted accounting principles for
interim financial information and with the instructions to Form 10-Q and
Article 10 of Regulation S-X.  Accordingly, they do not include all of the
information and footnotes required by generally accepted accounting
principles for complete financial statements.  In the opinion of
management, all adjustments, consisting only of normal recurring accruals,
considered necessary for a fair presentation, have been included in the
accompanying unaudited financial statements.  For more complete financial
information, these financial statements should be read in conjunction with
the audited financial statements and notes thereto contained in the
Company's 10-K for the fiscal year ended December 31, 1995.  Results for
the interim periods are not necessarily indicative of the results for any
other interim period or for the full fiscal year.

2.   Net Loss Per Share of Common Stock

     The historical net loss per share amounts are presented in accordance
with Accounting Principles Bulletin No. 15 ("APB 15") and Staff Accounting
Bulletin No. 83 ("SAB 83").  Under SAB 83, loss per share amounts for
periods presented in the Company's S-1 Registration Statement dated June
21, 1994 previously filed in connection with the Company's initial public
offering ("IPO") of its common stock are computed assuming that options,
warrants and  convertible debt and securities issued within one year prior
to the filing of that registration statement, at prices or conversion
prices less than the IPO price are outstanding for all periods presented,
regardless of whether the effect is dilutive or anti-dilutive.

     The guidance under SAB 83 applies only to those periods presented in
and prior to the Company's initial S-1 Registration Statement;  all
subsequent periods are governed solely by APB 15.  Therefore, the net loss
per share for periods after the IPO are computed in accordance with APB 15. 
Under this guidance, options, warrants, convertible debt and securities and
other common stock equivalents are considered as outstanding only if their
effect is dilutive (i.e. increasing the net loss per share).

     The Supplemental net loss per share amount for the period June 12,
1990 to March 31, 1996 gives effect to the conversion of the Preferred
Stock and Convertible Notes into Common Stock which occurred
contemporaneously with the closing of the Company's public offering.


                                     6

<PAGE>
 3.  Preferred Stock Issuance

     On February 29, 1996, the Company sold 300,000 shares  of Series A
Convertible Preferred Stock, $.001 par value,  for an aggregate
consideration of $3,000,000.  Each share of Series A Convertible Preferred
Stock is convertible into shares of the Company's common stock at the
option of the holder at an initial conversion price of $2.25 per share of
Common Stock, representing an initial conversion rate of 4.444444; and
shall be automatically convertible into the securities sold in the
Company's next equity offering of at least $2,500,000 (a "Qualified
Offering").  The conversion price, subject to certain adjustments, will  be
the  lesser of $2.25 and 75% of the price of the securities sold in the
Qualified Offering.  The exercise price and the number of shares of Common
Stock purchasable upon the exercise of the Class A and Class B Warrants and
the underwriter's purchase option were adjusted as a result of the issuance
of the Series A Convertible Preferred Stock.  Each Class A Warrant has been
adjusted such that the exercise price is $6.16 and allows the holder to
acquire 1.1 shares of Common Stock.   Each Class B Warrant has been
adjusted such that the exercise price is $10.19 and allows the holder to
acquire 1.1 shares of Common Stock.  In connection with the Company's
private placement of its Series A Preferred Stock, the Company paid
commissions of $300,000 and non-accountable expense allowances of  $90,000
to a company controlled by a significant shareholder which served as  the
Placement Agent.  In addition, the Company issued to the Placement Agent a
warrant to purchase 30,000 shares of Series A Convertible Preferred Stock,
$.001 par value per share, for an aggregate purchase price of $375,000. The
Company has signed a letter of intent with the placement agent to conduct a
best efforts offering intended to be the Qualifying Offering.  However,
there can be no assurance that such proposed offering will be consummated,
or if consummated, when the closing might occur or on w hat terms it will
be consummated. 


4.  Acquisition of the Business and Assets of Lexin Pharmaceutical
Corporation

     On March 15, 1996, the Company acquired the business and assets, and
assumed certain liabilities of Lexin Pharmaceutical Corporation ("Lexin"),
for an initial payment of 2,000,000 shares of the Company's Common Stock. 
The purchase agreement provides for the issuance of up to an additional
600,000 shares of Common Stock upon achievement of certain milestones
related to the Lexin assets acquired.  The acquisition was accounted for
using the purchase method of accounting.  The fair value of the net assets
acquired was recorded based on the carrying value for monetary and fixed
assets with the remaining portion of the purchase price ($3,062,913)
allocated to acquired research and development, which was expensed in the
quarter ended March 31, 1996.


                                     7

<PAGE>
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATIONS

     Since its inception in June 1990, the Company has been engaged in
acquiring and developing technologies and drug candidates for the treatment
of cancer and viral diseases. Sparta has not derived revenues from the sale
of any products and expects to incur substantial operating losses for the
next several years. As of March 31, 1996, the Company's accumulated deficit
was $13,667,017.

     On March 15, 1996, Sparta acquired the assets and business of Lexin
Pharmaceutical Corporation ("Lexin") of Horsham, Pennsylvania.  Lexin has
been in the business of developing and commercializing technology and
compounds which were licensed exclusively from the University of
Pennsylvania and Wichita State University and are directed at the potential
treatment of a number of life threatening diseases.  The technology and
compounds are related to inhibition of serine proteases, which are enzymes
which digest proteins and are implicated in a number of diseases including
cancer, cardiovascular disorders and acute inflammation.  Lexin's lead
compound LEX032, is under option to Astra Merck Inc.  for acute
pancreatitis.

The results of operations for the quarter ended March 31, 1996 include the 
operating expenses for the Lexin business from the date of acquisition.  The 
Company's balance sheet at March 31, 1996 reflects the inclusion of the Lexin 
assets acquired.

Results of Operations

Three Months Ended March 31, 1995 and 1996

     Revenue decreased from $60,082 for the three months ended March 31,
1995 to $18,713 for the three months ended March 31, 1996 due primarily to
a lower level of interest income.  Interest income decreased from $45,902
in the first quarter of 1995 to $18,713 for the same period in 1996 due to
a lower  level of investable funds.  Interest income is likely to decrease
in subsequent periods as investable funds are consumed by the operations of
the Company, unless the Company is able to secure additional funding. 
Contract revenue decreased to $0 for the first quarter of 1996 as compared
to $14,180 for the first quarter of 1995.  Contract revenues in the first
quarter of 1995 resulted in part from the completion of work under a Phase
I SBIR grant from the National Cancer Institute, under which grant the
Company  produced and tested formulations of etoposide utilizing its
Spartaject(TM) Drug Delivery Technology.  The balance of 1995 first quarter
contract revenue related to a  fee for a partially completed contract under
which the Company provided a pharmaceutical client with drug formulations
utilizing its Spartaject(TM) Drug Delivery Technology.   The amount of
revenues may  vary significantly year-to-year and quarter-to-quarter and
depend on, among other factors, the timing and amount of future financings
and the potential awarding of future grants and contracts. 

     Research and development expenses decreased from $376,673, in the
first quarter of 1995 to $292,858  in the first quarter of 1996. The
decrease is largely attributable to decreased outside development
expenditures by the Company on certain drug candidates during the first
quarter of 1996 partially offset by increases in expenditures on
applications of the Company's L.A.D.D. Technology and RII retinamide
programs.  Subject to the receipt of additional funding, the Company
expects research and development expenses to increase during the next
several years as product development, preclinical and clinical trials, and
regulatory activities increase.

     General and administrative expenses increased to $312,503, in the
first quarter of 1996 from $257,572, in the first quarter of 1995.  This
increase is principally due to financial advisory fees incurred in the
first quarter of 1996.

     The Company expects to incur substantial operating losses over the
next several years.  The amount of net losses may vary significantly from
year-to-year and quarter-to-quarter and depend on, among other factors, the
timing of research and the progress of preclinical and clinical development
programs. 

Liquidity and Capital Resources

     On February 29, 1996, the Company completed a private placement of
$3,000,000 of its Series A Convertible Preferred Stock   (the "Series A
Preferred Stock"), $.001 par value per share.  The Series A Preferred Stock
sold in the financing is convertible at any time at the option of the
holder at an initial conversion price of $2.25 per share of common 


                                     8

<PAGE>
stock.  In addition, the Series A Preferred Stock is automatically convertible
into the securities sold in the Company's next equity offering of at least
$2,500,000.  The conversion price, subject to certain adjustments, will be the
lesser of $2.25 and 75% of the price of the securities sold in the qualifying
offering.  In connection with the private placement, the Company paid
commissions of $300,000 and non-accountable expense allowances of  $90,000 to a
company controlled by a significant shareholder.  In addition, the Company
issued  the placement agent a warrant to purchase 30,000 shares of the Series A
Preferred Stock , for an aggregate purchase price of $375,000.  Net proceeds of
the financing after commissions, legal fees and other expenses were
approximately $2,570,000.

     The Company has used approximately $9,360,693 to fund operations from
inception through March 31, 1996. The Company has financed its operations to
date from the proceeds of its private placement of Series A Preferred Stock, its
initial public offering in June and July 1994, prior placements of equity and
convertible debt securities and investment income.  In 1996, the Company is
obligated under its license agreements to make minimum royalty payments and an
annual maintenance fee in the aggregate of $232,000, of which $27,000 has been
paid as of April 30, 1996. Under a collaboration and option agreement, the term
of which has been extended, the Company may have to make payments of up to
$225,000, of which approximately $72,000 had been paid as of April 30, 1996.  
The Company currently anticipates making payments totaling $60,000 under this
agreement in 1996, none of which has been paid as of April 30, 1996. The Company
is a party to several research agreements which require payments upon certain
events.  The Company anticipates making payments of approximately $457,000 under
the agreements which were in effect as of April 30, 1996.  Provided that there
is adequate financing, the amount of the Company's obligations under research
agreements can be expected to increase.  In addition, the Company is a party to
employment agreements with two of its executive officers and  a former executive
officer as well as certain consulting agreements which provide for annual,
minimum payments of $500,000 and $97,000, respectively in 1996, of which
$177,479 has been paid as of April 30, 1996.  Upon the acquisition of the assets
and business of Lexin, Sparta assumed an operating  lease obligation which will
require the Company to make payments of approximately $100,000 in 1996.  The
Company has contracted with Cato Research Ltd. ("Cato") to provide drug
development services. Cato's services are paid for with a combination of cash
and Common Stock.

     As of March  31, 1996, the Company had cash and cash equivalents of
$2,697,862, accounts payable and accrued expenses of $393,433, and working
capital of $2,451,960.  The report of the Company's independent auditors on the
Company's financial statements as of December 31,1995 and 1994 for the years
then ended and for the period from June 12, 1990 (inception) to December 31,
1995 contains a paragraph regarding the uncertainty with respect to the ability
of the Company to continue as a going concern. 

     The Company currently anticipates that the available cash, cash
equivalents, and investments will be sufficient to fund operations through the
third quarter of 1996.   However, the Company may be required to obtain
additional financing to continue operations during such period in the event of
cost overruns or unanticipated expenses. The Company has experienced delays in
funding its planned research and development activities and will require
substantial additional funds to finance its business activities on an ongoing
basis. The Company's future capital requirements will depend on numerous
factors, including, but not limited to, progress in its research and development
programs, including preclinical and clinical trials, costs of filing and
prosecuting patent applications and, if necessary, enforcing issued patents or
obtaining additional licenses of patents, competing technological and market
developments, the cost and timing of regulatory approvals, the ability of the
Company to establish collaborative relationships, and the cost of establishing
manufacturing, sales and marketing capabilities.  The Company has signed a
letter of intent with a placement agent do a"best efforts" equity offering (the
"Proposed Equity Offering") which is anticipated to commence during the second
quarter of 1996.  However, its letter of intent does not represent a legal
commitment  to complete the Proposed Equity Offering and there can be no
assurance that the Proposed Equity Offering will be consummated or, if
consummated, when the closing might occur or on what terms it will be
consummated.  The Company has no current commitment to obtain other additional
funds and is unable to state the amount or potential source of such other
additional funds. Moreover, because of the Company's potential long-term capital
requirements, it may undertake additional equity offerings whenever conditions
are favorable, even if it does not have an immediate need for additional capital
at that time. There can be no assurance that the Company will be able to obtain
additional funding when needed, or that such funding, if available, will be
obtainable on reasonable terms. Any such additional funding may result in
significant dilution to existing stockholders. If adequate funds are not
available, the Company may be required to delay, reduce or eliminate research
and development programs, capital expenditures, and other operating expenses.
The Company may be required to obtain funds through arrangements with
collaborative partners that may require the Company to relinquish certain 


                                        9

<PAGE>
material rights to its products that it would not otherwise relinquish.  

     The Company's ability to raise funds is likely to be adversely affected if
it is unable to continue to meet the listing criteria on the National
Association of Securities Dealers Automated Quotation System ("NASDAQ")
SmallCap(SM) Market.  The NASDAQ SmallCap Market listing criteria requires a
minimum of $2,000,000 in total assets and a minimum capital and surplus of
$1,000,000.  The Company's assets fell below the required minimum during the
third quarter of 1995.  The Listing Qualifications Committee of NASDAQ (the
"Qualifications Committee") granted the Company a temporary exception from such
requirements subject to meeting certain conditions, one of which was the closing
of the recently completed private placement no later than February 29, 1996.  On
March 14, 1996, the Company was notified that it had satisfied the requirements
for continued listing.  If the Company does not raise sufficient funds, it will
again fail to meet such criteria during the first six months of 1996. If such
funds are not received until the later part of such period, the Company either
will have to significantly reduce its operations, particularly its research and
development, in order to maintain compliance or it will cease to be in
compliance during such period.  If the Company becomes unable to meet such
criteria and is delisted from NASDAQ, trading, if any, in the Common Stock would
thereafter be conducted in the over-the-counter market in the so-called "pink
sheets" or, if then available, the National Association of Securities Dealers
Inc.'s ("NASD") "Electronic Bulletin Board." If delisting occurs, the Company's
securities may also become "penny stock" as defined in the Securities Exchange
Act of 1934, which may also adversely affect the Company's ability to raise
funds.  As a result, an investor would likely find it more difficult to dispose
of, or to obtain accurate quotations as to the value of, the Company's
securities.


                                       10

<PAGE>
                            PART II-OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

         Not applicable.

ITEM 2.  CHANGES IN SECURITIES

         Not applicable.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES

         Not applicable.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         No matters were submitted to security holders during the quarterly 
         period ended March 31, 1996.

ITEM 5.  OTHER INFORMATION

         Not applicable.

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

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

  %%%2.1          -- Copy of the Asset Purchase Agreement, with 
                     exhibits thereto, dated February 22,  1996,
                     between the Registrant and Lexin
                     Pharmaceutical Corporation
   %%3.4          -- Restated Certificate of Incorporation 
                     (including Certificate of Designation filed
                     February 26, 1996 and Certificate of
                     Retirement filed March 5, 1996)
   **4.1          -- Article Fourth, Article Sixth and Article
                     Seventh of the Certificate of  
                     Incorporation, as amended (filed as 
                     Exhibit 3.1)
   **4.2          -- Form of Common Stock Certificate
   **4.3          -- Form of Class A Warrant Certificate
   **4.4          -- Form of Class B Warrant Certificate
  ***4.5          -- Unit Purchase Option granted to Americorp 
                     Securities Inc. dated June 28, 1994
  ***4.6          -- Warrant Agreement entered into among 
                     Midlantic National Bank, Americorp
                     Securities, Inc., and the Registrant dated
                     June 21, 1994
  *+10.1          -- Exclusive License Agreement, dated
                     October 1, 1991, between the Registrant and
                     Yale University ("Yale") and Subscription
                     Agreement, dated October 21, 1991, between
                     the Registrant and Yale
  *+10.1A         -- Revised pages of Exhibit 10.1
  *+10.2          -- License Agreement, dated October 7, 1991,
                     between the Registrant and The Research
                     Foundation of State University of New York
  *+10.2A         -- Revised pages of Exhibit 10.2
  *+10.3          -- Research and License Agreement, dated as of
                     October 15, 1991, between the Registrant
                     and Institute of Materia Medica of the
                     Chinese Academy of Medical Sciences
                     ("BIMM"), as amended by an Amendment of
                     Research and License Agreement, dated as of
                     March 1, 1992, between the Registrant and
                     BIMM
  *+10.3A         -- Revised pages of Exhibit 10.3
  *+10.4          -- Licensing and First Refusal Agreement,
                     dated as of March 12, 1992, between the

                                11

<PAGE>


                     Registrant and the Dana-Farber Cancer Institute, Inc.
                     ("Dana-Farber"), a Letter Agreement, dated March 12,
                     1992, between the Registrant and Dana-Farber, and a
                     Letter Agreement, dated September 12, 1992, between the
                     Registrant and Dana-Farber
*+10.4A           -- Revised pages of Exhibit 10.4
*+10.5            -- License Agreement, dated as of August 31, 1992, between
                     the Registrant and Imperial Chemical Industries PLC
*+10.5A           -- Revised pages of Exhibit 10.5
 *10.6            -- Letter Agreement, dated October 30, 1992, among the
                     Registrant, Imperial Chemical Industries PLC, and ICI
                     Bioscience Limited
*+10.7            -- Collaboration and Option Agreement, dated September 18,
                     1992, by and among the Registrant, Cancer Research
                     Campaign and Cancer Research Campaign Technology Limited
*+10.7A           -- Revised pages of Exhibit 10.7
*+10.8            -- Sublicense Agreement, dated July 13, 1992, between the
                     Registrant and Research Triangle Pharmaceuticals Ltd.
                     ("RTP"), as amended by a Letter Agreement, dated
                     October 27, 1992, between the Registrant and RTP and by
                     a Second Amendment to Sublicense Agreement, dated
                     March 19, 1993, between the Registrant and RTP
*+10.8A           -- Revised pages of Exhibit 10.8
*+10.9            -- Service Agreement, dated November 27, 1991, between the
                     Registrant and Cato Research, Ltd. ("Cato"), as amended
                     by a Letter Agreement, dated March 16, 1993, between the
                     Registrant and Cato
 *10.9A           -- Revised pages of Exhibit 10.9
 *10.10           -- Letter Agreement, dated October 28, 1991, between the
                     Registrant and Cato
 *10.11           -- Subscription Agreement, dated November 27, 1991, between
                     the Registrant and Cato Holding Co
 *10.12           -- Subscription Agreement, dated December 10, 1993, between
                     the Registrant and Cato Holding Co. 
 *10.13           -- Employment Agreement, dated as of January 28, 1991,
                     between the Registrant and William M. Sullivan, as
                     amended by a Letter Agreement, dated as of March 2,
                     1993, between the parties
 *10.14           -- Nonqualified Stock Option Agreement, dated as of
                     December 3, 1991, between the Registrant and
                     William M. Sullivan
 *10.15           -- Confidentiality Agreement, dated as of January 28, 1991,
                     between the Registrant and William M. Sullivan
 *10.16           -- Employment Agreement, dated July 2, 1992, between the
                     Registrant and William McCulloch, as amended by a Letter
                     Agreement, dated as of March 2, 1993, between the
                     parties, and Guarantee by The Castle Group Ltd. 
 *10.17           -- Incentive Stock Option Agreement, dated as of October 1,
                     1992, between the Registrant and William McCulloch
 *10.18           -- Nonqualified Stock Option Agreement, dated as of
                     October 1, 1992, between the Registrant and
                     William McCulloch
 *10.19           -- Nonqualified Stock Option Agreement, dated as of
                     October 1, 1992, between the Registrant and
                     William McCulloch
 *10.20           -- Confidentiality Agreement, dated as of July 2, 1992,
                     between the Registrant and William McCulloch
 *10.21           -- Noncompetition Agreement, dated as of October 1, 1992,
                     between the Registrant and William McCulloch
 *10.22           -- Employment Agreement, dated September 10, 1992, between
                     the Registrant and Richard N. Scott, as amended by a
                     Letter Agreement, dated as of March 2, 1993, between the
                     parties, and Guarantee by The Castle Group Ltd. 


                                      12

<PAGE>


*10.23            -- Incentive Stock Option Agreement, dated as of
                     September 10, 1992, between the Registrant and
                     Richard N. Scott
*10.24            -- Nonqualified Stock Option Agreement, dated as of
                     September 10, 1992, between the Registrant and
                     Richard N. Scott
*10.25            -- Confidentiality Agreement, dated as of September 10,
                     1992, between the Registrant and Richard N. Scott
*10.26            -- Confidentiality Agreement, dated as of September 10,
                     1992, between the Registrant and John S. McBride
*10.27            -- Letter Agreement, dated March 23, 1993, between the
                     Registrant and Paramount Capital, Inc., as amended by
                     Letter Agreements dated June 24, 1993, June 28, 1993,
                     September 24, 1993 and November 5, 1993
*10.28            -- Indemnification Agreement, dated as of June 3, 1992,
                     between the Registrant and The Castle Group Ltd.
                     relative to William McCulloch
*10.29            -- Indemnification Agreement, dated as of September 15,
                     1992, between the Registrant and The Castle Group Ltd.
                     relative to Richard N. Scott
*10.30            -- 1991 Stock Plan, as amended
*10.31            -- Stock Repurchase Agreement, dated as of November 21,
                     1991, between the Registrant and Peter Barton Hutt
*10.32            -- Stock Repurchase Agreement, dated as of October 25,
                     1991, between the Registrant and Charles O. O'Brien
*10.33            -- Stock Repurchase Agreement, dated as of October 15,
                     1991, between the Registrant and Sir John Vane
*10.34            -- Stock Repurchase Agreement, dated as of December 24,
                     1991, between the Registrant and The Sir John Vane Trust
*10.35            -- Stock Repurchase Agreement, dated as of October 5, 1993,
                     between the Registrant and Richard N. Scott and related
                     Assignment of even date between the parties
*10.36            -- Form of convertible notes issued on or prior to
                     October 28, 1993 and schedule of purchasers of notes
*10.37            -- Form of Note Purchase and Subscription Agreement for
                     issuance of convertible notes issued prior to
                     October 28, 1993 and schedule of purchasers of notes
*10.38            -- Form of convertible notes issued in November 1993 and
                     schedule of purchasers of notes
*10.39            -- Note Purchase and Subscription Agreement dated as of
                     November 12, 1993 between the Registrant and Financial
                     Strategic Portfolios, Inc. -- Health Sciences Portfolio
                     ("FSP") for issuance of convertible notes (See
                     Exhibit 10.38 hereunder for Exhibit A to this
                     Exhibit 10.39)
*10.40            -- Form of Note Purchase and Subscription Agreement for
                     issuance of convertible notes issued in November 1993
                     other than to FSP
*10.41            -- Form of Note Purchase and Exchange Agreement for
                     exchange of convertible notes, form of convertible notes
                     and schedule of parties thereto
*10.41A           -- Revised schedule of parties to Exhibit 10.41
*10.42            -- Stock Purchase and Exchange Agreement, dated as of
                     December 10, 1993, between the Registrant and FBL
                     Ventures of South Dakota
*10.43            -- Registration Rights Agreement, dated November 12, 1993,
                     among the Registrant and certain rights holders, as
                     amended as of December 14, 1993
*10.44            -- Subscription Agreement dated September 14, 1992 and
                     Letter Agreements dated October 12, 1992 and
                     December 13, 1993, between the Registrant and Yale
                     University
*10.44A           -- Letter Agreement dated January 4, 1994
*10.45            -- Noncompetition Agreement, dated as of September 10,
                     1992, between the Registrant and Richard N. Scott


                                      13

<PAGE>


***10.46          -- M/A Agreement between the Registrant and Americorp
                     Securities, Inc. dated June 28, 1994
 **10.47          -- Form of Warrant Purchase Agreement among the Registrant;
                     Healthcare Capital Investments, Inc. and Societe
                     Generale Securities Corporation; and the Holders listed
                     on Schedule I thereto
 **10.48          -- Form of Warrant Purchase Agreement among the Registrant,
                     Paramount Capital, Inc. and the Holders listed on
                     Schedule I thereto
***10.49          -- Underwriting Agreement between the Registrant and
                     Americorp Securities, Inc. dated June 21, 1994
***10.50          -- Unit Purchase Option granted to LT Lawrence & Company,
                     Inc. dated June 28, 1994
  #10.51          -- Nonqualified Stock Option Agreement, dated as of
                     December 16, 1994, between the Registrant and
                     William M. Sullivan
  #10.52          -- Nonqualified Stock Option Agreement, dated as of
                     July 10, 1994, between the Registrant and Sir John Vane,
                     FSR
  #10.53          -- Nonqualified Stock Option Agreement, dated as of
                     July 10, 1994, between the Registrant and
                     Charles O. O'Brien
  #10.54          -- Nonqualified Stock Option Agreement, dated as of
                     July 10, 1994, between the Registrant and
                     Peter Barton Hutt
  #10.55          -- Incentive Stock Option Agreement, dated as of
                     December 16, 1994, between the Registrant and
                     William McCulloch
  #10.56          -- Amendment (as of March 14, 1994) to the Employment
                     Agreement, dated July 2, 1992, between the Registrant
                     and William McCulloch, as amended by a Letter Agreement,
                     dated as of March 2, 1993, between the parties, and
                     Guaranteed by The Castle Group Ltd. 
  #10.57          -- Amendment (dated November 26, 1994) to the Service
                     Agreement, dated November 27, 1991, between the
                     Registrant and Cato Holding Co. 
  #10.58          -- Amendment (dated December 16, 1994) to the Employment
                     Agreement, dated January 28, 1991, between the
                     Registrant and William M. Sullivan, as amended by a
                     Letter Agreement, dated as of March 2, 1993, between the
                     parties. 
 ##10.59          -- Nonqualified Stock Option Agreement, dated as of June 7,
                     1995, between the Registrant and Sir John Vane, FSR
 ##10.60          -- Nonqualified Stock Option Agreement, dated as of June 7,
                     1995, between the Registrant and Charles O. O'Brien
 ##10.61          -- Nonqualified Stock Option Agreement, dated as of June 7,
                     1995, between the Registrant and Peter Barton Hutt
 ##10.62          -- Amendment (dated June 1, 1995) to the Research and
                     License Agreement, dated as of October 15, 1991, between
                     the Registrant and Institute of Materia Medica of the
                     Chinese Academy of Medical Sciences ("BIMM"), as amended
                     by an Amendment of Research and License Agreement, dated
                     as of March 1, 1992, between the Registrant and BIMM
   10.63          -- Financial Advisory Agreement between the Registrant and
                     Americorp Securities, Inc., dated as of June 29, 1995
  %10.64          -- Amendment (dated as of September 14, 1994) to the
                     Collaboration and Option Agreement, dated September 18,
                     1992, by and among the Registrant, Cancer Research
                     Campaign and Cancer Research Campaign Technology Limited
 %%10.65          -- Form of Nonqualified Stock Option Agreement, dated as of
                     December 10, 1995, between the Company and William M.
                     Sullivan
 %%10.66          -- Incentive Stock Option Agreement, dated as of
                     December 10, 1995, between the Company and William
                     McCulloch
 %%10.67          -- Distribution Agreement, dated as of December 1, 1995,
                     among Sparta Pharmaceuticals, Inc., Orphan Europe SARL
                     and Swedish Orphan, AB
 %%10.68          -- Warrant Agreement between Sparta Pharmaceuticals, Inc.
                     and Paramount Capital, Inc., dated February 29, 1996


                                      14

<PAGE>


  10.69           -- Financial advisory agreement between the Registrant and
                     Paramount Capital, Inc. dated  as of February 29, 1996.
 !10.70           -- Evaluation and option agreement between Lexin
                     Pharmaceutical Corporation and Astra Merck, Inc.
                     dated as of October 25, 1995. (Assigned to Registrant
                     pursuant to the Lexin purchase)
 !10.71           -- Collaborative Research and Licensing Agreement between
                     Lexin Pharmaceutical Corporation and Wichita State
                     University dated as of April 1, 1994. (Assigned to 
                     Registrant pursuant to the Lexin purchase)
 !10.72           -- License Agreement between PI Research Corporation
                     (predecessor in name to Lexin Pharmaceutical
                     Corporation) and the Trustees of The University of
                     Pennsylvania dated as of January 2, 1992. (Assigned to
                     Registrant pursuant to the Lexin purchase) 
   10.73          -- Amendment (dated March 15, 1996) to the Employment
                     Agreement  dated January 28, 1991, between the
                     Registrant and William M. Sullivan, as amended by letter
                     agreements, dated as of March 2, 1993 and December 16,
                     1994, between the parties.
   10.74          -- Placement Agency Agreement between the Registrant and
                     Paramount Capital, Inc., dated as of January 22, 1996.
   11.1           -- Statement Re Computation of Per Share Earnings.
   27.1           -- Financial Data Schedule

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

*             Previously filed  with the Company's  Registration Statement  on
              Form  S-l, Registration Number 33-72882, filed on December 14,
              1993, or amendments  thereto, and are incorporated by reference
              herein.
**            Previously filed  with the  Company's Registration Statement on
              Form S-l, Registration Number 33-78086, filed on April 25, 1994,
              or in Amendment No. 1 thereto, filed on June 1, 1994. 
***           Previously filed with the Company's Quarterly Report on Form 10-
              Q for the quarterly period ended June 30, 1994, filed on
              August 15, 1994 and are incorporated by reference herein. 
#             Previously filed with the Company's 1994 Annual Report on Form
              10-K, filed on March 31, 1995, and are incorporated by reference
              herein. 
##            Previously filed with the Company's Quarterly Report on form 10-
              Q for the quarterly period ended June 30, 1995, filed on  
              August 14, 1995.
###           Previously filed with the Company's Amendment No. 1 to the
              Quarterly Report on Form 10-Q for the quarterly period ended
              September 30, 1995, filed on January 24, 1996.
%             Previously filed with the Company's Quarterly Report on Form 10-
              Q for the quarterly period ended September 30, 1995, filed on
              November 14, 1995.
%%            Previously filed with the Company's 1995 Annual Report on Form
              10-K, filed on April 1, 1996,and are incorporated by reference
              herein.
%%%           Previously filed with the Company's report on Form 8-K filed on 
              April 1, 1996, and is incorporated by reference herein.
+             Confidential Treatment has been granted by the Securities and
              Exchange Commission.
!             Confidential Treatment has been requested from the
              Securities and Exchange Commission
         
 The Company filed the following reports on Form 8-K during the quarter: 

     On  February 5,  1996, a report  on Form  8-K dated January  18, 1996 was
filed with  the Securities  and Exchange Commission  announcing the  continued
listing of  Sparta Pharmaceuticals' common  stock and other securities  on the
NASDAQ SmallCap market via an exception from the total assets requirement.  No
financial statements were filed with the report.

     On February 23, 1996,   a report on Form 8-K dated February  22, 1996 was
filed with the  Securities and Exchange Commission announcing  an agreement to
acquire all of the assets and business of Lexin 


                                      15

<PAGE>


Pharmaceutical Corporation ("Lexin"),  in exchange for up  to 2,600,000 shares
of Sparta Pharmaceuticals' common stock.  No financial statements were filed
with the report.

     On March 14, 1996, a report on Form 8-K dated March 6, 1996 was filed
with the Securities and Exchange Commission announcing the completion of a
private placement of $3,000,000 of convertible preferred stock. No financial
statements were filed with the report.

     On April 1, 1996, a report on Form 8-K dated March 15, 1996 was filed
with the Securities and Exchange Commission announcing the acquisition of the
assets and business of Lexin Pharmaceutical Corporation.  The report also
announced the appointments of Dr. Jerry B. Hook, former President, CEO and
Director of Lexin, and Ronald H. Spair, former Vice President and Chief
Financial Officer of Lexin, to those positions at Sparta.  Richard L.
Sherman, a former Director of Lexin was appointed a Director of Sparta
Pharmaceuticals, Inc.  It was impracticable to provide the required financial
statements for Lexin Pharmaceutical Coporation at the date of filing.  The
statements were filed via an amendment to the report on Form 8-K  filed on 
May 3, 1996.

     On May 3, 1996, a report on Form 8-K dated April 30, 1996 was filed with 
the Securities and Exchange Commission announcing a change in the Registrant's 
independent public accountants.


                                      16

<PAGE>


Signatures

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


                            Sparta Pharmaceuticals, Inc.

 May 10, 1996    By: /s/  Jerry B. Hook       President and Chief Executive
- -------------        ------------------------ Officer (principal  executive 
 Date                Jerry B. Hook, Ph.D.     officer) and Director



                                           
 May 10, 1996    By: /s/ Ronald H. Spair      Vice President and Chief Financial
- -------------      -------------------------  Officer (principal Financial 
 Date              Ronald H.Spair             Officer)


                                      17



<PAGE>



                                             June 29, 1995



Sparta Pharmaceuticals, Inc. 
Westpark Corporate Center, Suite 110
4364 South Alston Avenue
Durham, North Carolina 27713

Attention:  William M. Sullivan

Gentlemen:

     Americorp Securities, Inc. ("Americorp") is pleased to act as a
financial advisor to Sparta Pharmaceuticals, Inc. (the "Company") in
connection with matters relating to the business and capital structure of
the Company as set forth in more detail below.  This letter is to confirm
our understanding with respect to our engagement.  

     1.   Americorp will consult with and assist the Company in connection
with the following matters:

     2.   (a)  Optimization of the Company's capital structure, including
matters related to the issuance of debt and equity securities and the
restructuring of the Company's capital structure.

          (b)  Advice as to the advisability of public and private
offerings of securities.

          (c)  Identification and discussion with respect to acquisitions
and divestitures in order to enhance the value and viability of the
Company.

          (d)  Assistance in the preparation of presentations to potential
sources of capital such as underwriters, placement agents and institutional
investors.

          (e)  Identification and advice with respect to joint ventures
and/or collaborations arrangements.

     3.   In rendering the services hereunder Americorp shall devote such
time and attention thereto as Americorp determines in its discretion to be
reasonable and adequate.

     4.   The Company will cooperate with Americorp in connection with its
financial review and analysis and will provide Americorp with such
information concerning the Company as Americorp deems



<PAGE>



reasonably necessary for its financial review and analysis.  All such
information provided by the Company will be complete and accurate and not
misleading.  All such information which is confidential shall be subject to
a confidentiality agreement to be executed by the parties.  Americorp
agrees that it will obtain the Company's consent prior to contacting any
third party with respect to a proposed transaction or other arrangement. 
Americorp also agrees that it will not represent that it is an agent of the
Company and acknowledges that the Company shall not have any obligation
hereunder to enter into any transaction or other arrangement with a third
party.

     5.   In consideration for the services rendered hereunder you agree to
pay to Americorp a fee of $300,000 upon execution of this Agreement.

     6.   In addition to any fees that may be payable to Americorp under
this letter, you agree that you will reimburse Americorp and its
affiliates, upon request made from time to time, for their reasonable out-
of-pocket expenses which have been approved by you in advance and are
incurred in connection with their activities under this letter.  Nothing in
this Agreement shall restrict Americorp's rights to be reimbursed for
expenses under any separate agreement between the parties.

     7.   This Agreement is for a term of one year.

     8.   You agree that you will indemnify and hold harmless Americorp and
its affiliates and their respective directors, officers, employees, agents
and controlling persons (each being an "Indemnified Party"), from and
against any and all losses, claims, damages and liabilities, joint or
several, to which such Indemnified Party may become subject under any
applicable law or otherwise relating to or arising out of the performance
by Americorp or its affiliates of the services contemplated by this letter
and will reimburse any Indemnified Party for all expenses (including
reasonable counsel fees and expenses) as they are incurred in connection
with the investigation of, preparation for or defense of any pending or
threatened claim or any action or proceeding arising therefrom, whether or
not such Indemnified Party is a party.  You will not be liable under the
foregoing indemnification provision to the extent that any loss, claim,
damage, liability or expense is found in a final judgment by a court to
have resulted primarily from Americorp's bad faith, willful misconduct or
gross negligence or breach by Americorp of this agreement or any other
agreement between the parties pertaining to this agreement.

     Promptly after receipt by an Indemnified Party of notice of the
commencement of any action, such Indemnified Party shall, if a claim in
respect thereof is to be made against the Company, notify the Company in
writing of the commencement thereof, but 



<PAGE>



the omission so to notify the Company will not relieve the Company from any
liability which it may have to an Indemnified Party, except to the extent
that the Company has been prejudiced in any material respect by such
failure.  No settlement of any action shall be made without the consent of
the Company which shall not be unreasonably withheld in light of all
factors of importance to the Company.  Notwithstanding any other provision
of this Section 8, indemnification of Americorp with respect to any
transaction covered by a separate indemnification agreement shall be
covered by the provisions of such agreement and not by the provisions
hereof.

     9.   This agreement not transferable by either party and may only be
amended, or any provisions hereof waived, in a writing signed by the
parties.  This Agreement, together with the letter agreement dated June 28,
1994 between the Company and Americorp, embodies the entire agreement and
understanding between the parties hereto with respect to the subject matter
hereof and supersedes all other prior oral or written agreements and
understandings relating to the subject matter hereof. 

     Please confirm that the foregoing correctly sets forth our agreement
by signing and returning to Americorp the duplicate copy of this letter
enclosed herewith.  We look forward to the successful conclusion of this
Agreement.

                                             Very truly yours,



                                             AMERICORP SECURITIES, INC.



                                  By: /s/ Thomas J. Jess VP Corporate Finance
                                      ---------------------------------------
                                           Name and Title:

Accepted and agreed
to as of the date
first above written

SPARTA PHARMACEUTICALS, INC.


By:/s/ William M. Sullivan Chairman Preso CEO
   ------------------------------------------
     Name and Title:






<PAGE>
         P A R A M O U N T  C A P I T A L
         INCORPORATED MEMBER: NASD, SIPC

                                                             February 29, 1996

              Sparta Pharmaceuticals, Inc. 
              Westpark Corporate Center, Suite 110
              4364 S. Alston Ave.
              Durham, NC 27713

              Dear Sirs:

                  1.     This  is to  confirm our  understanding that  Paramount
              Capital,  Inc. ("Paramount") has  been engaged as  a non-exclusive
              financial advisor of Sparta  Pharmaceuticals, Inc. (the "Company")
              for an initial period of twenty-four (24) months commencing on the
              date hereof  (as extended pursuant  to Paragraph 10 hereto,  or by
              mutual agreement of  the parties hereto, the "Term").  In its role
              as financial advisor, Paramount will maintain its familiarity with
              the   business,  operations,   properties,  financial   condition,
              prospects and management of the Company and assist the Company in:
              (a) identifying  prospective strategic partners,  acquirors and/or
              investors;  (b)  evaluating   offers  received  from   prospective
              partners,   acquirors  and/or   investors;   and  (c)   conducting
              discussions  and negotiations leading toward the consummation of a
              strategic  partnership, merger or  an investment. Paramount agrees
              to use its  reasonably diligent efforts in  rendering the services
              hereunder as reasonably requested by the Company. In addition, any
              fee otherwise  due hereunder  solely on  account of  introductions
              made prior to  the date hereof  shall not be due  unless Paramount
              shall   have  participated   in  some   way   in  effecting   such
              transactions, if requested by the Company.

                  2.    The Company will pay Paramount a non-refundable retainer
              fee for  Paramount's services  hereunder of  $3,000 per month  for
              twenty-four (24) months. The first payment shall be due within ten
              days of  the date hereof  and thereafter payable on  the fifteenth
              day of each month during the Term.

                  The Company also agrees to  pay in cash all reasonable out-of-
              pocket  expenses incurred by  Paramount in providing  its services
              hereunder,  including   fees  and  disbursements   of  Paramount's
              counsel, such  expenses to  be paid upon  submission of a  bill or
              bills by Paramount from time  to time. However, any expenses which
              in  the aggregate  exceed $1,000  for any  month will  require the
              prior  written  approval  of  the Company.  Fees  and  expenses of
              consultants or experts  shall not be  included unless approved  by
              the Company.

                  3.     Upon the Closing of each Investment  (as defined below)
              during the  Term or during  the twelve-month period  following the
              expiration or earlier  termination of the Term, the  Company shall
              pay to Paramount a fee in an amount equal to 9 %  of the aggregate
              value of such Investment and  shall issue to Paramount warrants to
              purchase an amount  of securities equal to 10 %  of the securities
              sold as part  of such Investment at  an exercise price of  110% of
              the price  of such securities,  exercisable until five  years from
              the date of issuance of such warrants. For
<PAGE>
         the purposes of this Agreement, an Investment  shall be any purchase of
         securities  of   the  Company  from  the  Company   (other  than  "firm
         commitment" or "best  efforts" underwritings,  purchases by  employees,
         directors, officers  and consultants of  the Company and  any financing
         contemplated by the Letter of Intent dated January 10, 1996 between the
         parties hereto)  which is made  during the  Term or during  the twelve-
         month period following the expiration of the Term  by an investor first
         introduced to the  Company by or  through Paramount during or  prior to
         the Term.

             4.    (a)     If the Company enters into an agreement with a  party
         first introduced to the Company by or through Paramount during or prior
         to  the Term pursuant to which  the Company consummates a sale, merger,
         consolidation,   tender   offer,   business   combination  or   similar
         transaction involving a majority of the business assets or stock of the
         Company in which  the Company  is not the  surviving entity (a  "Sale")
         during the  Term,  or  during the  twelve-month  period  following  the
         expiration or earlier termination of  such Term, then the Company shall
         pay Paramount  a fee equal to 6.0%  of the aggregate consideration paid
         to the  Company by  the acquiror, such  fee to be  payable in  the same
         consideration as paid to the Company simultaneously with the closing of
         such Sale, with the exception of Acquiror Future Payments in which case
         such fees are  to be  payable at such  time, and only  if, the  Company
         receives such Acquiror Future Payments.

            (b)  If  the Company enters into an agreement with an investor first
         introduced to the Company  by or through Paramount  during or prior  to
         the  Term  pursuant  to  which the  Company  consummates  a transaction
         wherein the Company  acquires all or substantially all  of the business
         assets or stock of another entity in which the Company is the surviving
         entity (an "Acquisition")  during the Term, or  during the twelve-month
         period following  the expiration of  such Term, then the  Company shall
         pay Paramount a  fee equal to 6.0% of the  aggregate consideration paid
         by the  Company to the entity acquired,  such fee to be  payable in the
         same  consideration  as paid  by  the Company  simultaneously  with the
         closing  of such  Acquisition, with  the exception  of Acquiror  Future
         Payments in which case  such fees are to be  payable at such time,  and
         only if, the Company receives such Acquiror Future Payments.

             (c)   For  purposes  of  calculating  Paramount's  fee  under  this
         Paragraph  4,  the aggregate  consideration  paid with  respect  to the
         business, assets or stock of the Company shall be equal to the total of
         all cash, securities and/or other assets paid for such business, assets
         or  stock by the acquiror.  Aggregate consideration shall also include:
         (a) any commercial bank or similar indebtedness  of the Company that is
         repaid  or for  which  the responsibility  to  pay  is assumed  by  the
         acquiror in  connection with such  transaction, (b) the greater  of the
         stated value or the liquidation value of preferred stock of the Company
         that is assumed or acquired by the acquiror that is not  converted into
         common stock  upon the  consummation of such  transaction, only  to the
         extent  that  the  securities  into  which  such  preferred  stock  are
         convertible are not  otherwise included above, and (c)  future payments
         for  which the  acquiror is  obligated  either absolutely  or upon  the
         attainment  of  milestones  or  financial  results   ("Acquiror  Future
         Payments"). In the event a Sale of the Company or an Acquisition by the
         Company  is consummated through a multiple-step transaction wherein the
         acquiror is not obligated either

                                            2
<PAGE>
         absolutely or upon the attainment of milestones or financial results to
         make future payments  to further increase  the acquiror's ownership  in
         the Company (the "Multiple-Step  Payments"), the Company agrees to  pay
         Paramount a fee on such  Multiple-Step Payments, and such fee  shall be
         calculated pursuant to this Paragraph 4. Such fee shall be payable when
         such Multiple-Step  Payments are made and  shall be in addition  to the
         fee paid to Paramount in the first step of such transaction.

             5.     If the  Company enters  into an agreement  with an  investor
         first introduced to the Company by or through Paramount during or prior
         to  the Term  pursuant to  which  the Company  consummates a  Strategic
         Alliance(s) (as defined  below) during the Term, or  during the twelve-
         month period  following the expiration  of such Term, then  the Company
         shall pay Paramount a  fee equal to  6% of the Aggregate  Consideration
         (as defined below) to be  received by the Company, its  shareholders or
         employees in each such transaction; such fee to be payable in  the same
         consideration as paid to the Company simultaneously with the closing of
         each such transaction,  with the exception of payments  received by the
         Company after the closing of such transaction as in Paragraphs 5(c) and
         5(d) below, in which case such fees are to be payable at such time, and
         only  if,  the Company  receives  such  payments.  For the  purpose  of
         calculating  Paramount's   fee  under   this  Paragraph   5,  Aggregate
         Consideration shall  include, but not  be limited to: (a)  all payments
         made at  closing  for  equity  securities, equity  security  rights  or
         similar   rights,  (b)  technology  access  fees  or  similar  up-front
         payments, (c) other  future payments to be  made to the Company  or its
         employees  for  which   the  Strategic  Alliance  partner(s)   (each  a
         "Partner")  is obligated either  absolutely or  upon the  attainment of
         milestones,  (d) funding provided by the Partner (through reimbursement
         or otherwise) relative to research and development, clinical trials and
         related expenditures if such work is performed by the Company and shall
         not include funding provided  by the Partner (through  reimbursement or
         otherwise)  relative to research  and development, clinical  trials and
         related expenditures if such  work is not performed by the  Company and
         (e) the  repayment or assumption  by the Partner of  obligations of the
         Company, including indebtedness  for money borrowed or  amounts owed by
         the Company to inventors or owners of technology. The fee due hereunder
         on account of payments made  under paragraph (d) above shall be 3 %. It
         is further understood that Aggregate Consideration shall not be reduced
         by  the amount of  the fee due Paramount  hereunder. Any future rights,
         commitments,  contingent payments  and the  like (together,  "Strategic
         Alliance Payments") which are part of the Aggregate Consideration shall
         be valued when actually paid to the Company. A "Strategic Alliance" may
         include, but is not limited to: (a) joint venture, partnership, license
         or  other  contract  for  the   research,  development,  manufacturing,
         marketing,  distribution,  sale  or  other  activity  relating  to  the
         Company's  present  and/or future  products;  (b) the  purchase  of, or
         commitment to  purchase from the Company,  less than a  majority of the
         business,  assets or stock of the Company  by a Partner(s) with respect
         to its products and/or technology; (c) the sale of any of the Company's
         assets or any rights in respect to its  products and/or technology; and
         (d) a commitment  to provide funding for  all or part of  the Company's
         research and development  activities, whether such work is performed or
         managed by  the Company  or Partner. A  "Strategic Alliance"  shall not
         include   the   Company's   transactions  with   Lexin   Pharmaceutical
         Corporation.


                                        3
<PAGE>
             For  the  purposes  of   calculating  Paramount's  fee,  securities
         constituting  part  of Aggregate  Consideration  that are  traded  on a
         national securities exchange or the Nasdaq National Market System shall
         be valued at the  last closing price thereof  prior to the date of  the
         consummation or closing of any such  transaction. Such securities which
         are traded  over-the-counter shall  be valued at  the mean  between the
         latest bid and asked prices prior to such date.

             6.     In no event  shall a fee be  payable under more than  one of
         Sections 3, 4  or 5 hereof and  if more than  one section applies to  a
         transaction, then the  fee shall be calculated under  Section 5, unless
         it  is  not applicable,  in  which case  it shall  be  calculated under
         Section 4,  unless it  is not  applicable, in  which case  it shall  be
         calculated under Section 3.

             7.      Except as otherwise  required by law,  any financial advice
         rendered by Paramount pursuant to  this Agreement (and the existence of
         this Agreement)  may not  be disclosed publicly  in any  manner without
         Paramount' s prior written approval and will be treated by  the Company
         as confidential. The Company will provide Paramount with all  financial
         and  other  information  reasonably  requested  by  Paramount  for  the
         purposes of rendering its services  pursuant to this Agreement, subject
         to the  execution and  delivery of a  confidentiality agreement  to the
         Company acceptable to the Company.

             8.    All non-public information  given to Paramount by the Company
         will be treated by Paramount as confidential. In this regard, Paramount
         agrees to  enter  into such  confidentiality  agreements which  may  be
         reasonably  requested by  the  Company.  Paramount  may  rely,  without
         independent  verification,  on  the accuracy  and  completeness  of any
         information  furnished to  Paramount  by the  Company,  subject to  its
         obligations under the securities laws.

             9.      The  Company  agrees to  indemnify each  of  Paramount, the
         directors, officers, employees and agents thereof (the  "Indemnitees"),
         protect,  defend,  save and  hold  each  Indemnitee harmless  from  and
         against, any and all liabilities, damages, losses, settlements, claims,
         actions, suits, penalties, fines, costs or expenses (including, without
         limitation,  reasonable attorneys'  fees)  (any  of  the  foregoing,  a
         "Claim") incurred  by or  asserted against  any Indemnitee  of whatever
         kind  or nature,  arising from, in  connection with  or occurring  as a
         result of this Agreement or the matters contemplated by this Agreement,
         unless and to the extent it shall be finally judicially determined that
         such losses,  claims, damages  or liabilities arise  solely out  of the
         gross negligence or willful misfeasance  of Paramount in performing the
         services  which  are  the  subject  of  this Agreement.  The  foregoing
         agreement shall be in  addition to any  rights that any Indemnitee  may
         have at common  law or otherwise. The  Company agrees to pay  any legal
         and other expenses  for which  it is liable  under this subsection  (a)
         from time to time (but not  more frequently than monthly) within thirty
         (30) days  after  its receipt  of a  bill therefor.  Promptly after  an
         indemnified party  learns of  the commencement of  any action,  it will
         notify  the Company. The Company will be entitled to participate in and
         to assume the defense thereof,  with counsel reasonably satisfactory to
         the  indemnified  party, and  after  notice  from  the Company  to  the
         indemnified party,  of its election  so to assume the  defense thereof,
         the Company will  not be liable to the indemnified party, for any legal
         or other  expenses subsequently  incurred by  the indemnified  party in
         connection with the defense thereof other than reasonable costs of


                                            4
<PAGE>
         investigation.  The indemnified party  shall have  the right  to employ
         separate  counsel in any such action  and to participate in the defense
         thereof, but the fees and expenses of such counsel shall not be  at the
         expense of the  Company if the Company  has assumed the defense  of the
         action with counsel  reasonably satisfactory to the  indemnified party;
         provided that  the fees and  expenses of such  counsel shall be  at the
         expense  of  the  Company  if the  named  parties  to  any  such action
         (including any  impleaded  parties) include both the  indemnified party
         or  parties and  the Company  and, in the  judgment of  the indemnified
         party, it  is advisable  for the  indemnified party  or  parties to  be
         represented by  separate counsel (in  which case the Company  shall not
         have  the right to assume  the defense of such  action on behalf of the
         indemnified party  or parties, it  being understood, however,  that the
         Company shall not,  in connection with any one  such action or separate
         but  substantially similar or related actions  in the same jurisdiction
         arising out of the same general allegations or circumstances, be liable
         for the reasonable fees and expenses of  more than one separate firm of
         attorneys for the  indemnified party or parties). No  settlement of any
         action against an  indemnified party shall be made  without the consent
         of  the  indemnified party,  which  consent shall  not  be unreasonably
         withheld  in light  of all  factors  of importance  to the  indemnified
         party.

             10. The Term of this Agreement shall be renewed for consecutive six
         month periods upon the execution of a written agreement by both parties
         to extend  such Term. The Company  may terminate this  Agreement in the
         event  that Paramount  breaches its  confidentiality obligations  under
         this  Agreement.   Notwithstanding  any  early   termination  of   this
         Agreement, the rights to compensation  contained in Paragraphs 3, 4 and
         5 and  to indemnity  and reimbursement contained  in Paragraph  9 shall
         survive. In addition, Paramount shall  be entitled to the reimbursement
         of  expenses incurred  by Paramount  as a  result of  services rendered
         prior to the date of the termination.

             11.   This  Agreement   shall  be  governed  by  and  construed  in
         accordance with  the laws of  the State of  New York without  regard to
         principles of conflicts of law.

             12. This Agreement shall be  binding upon Paramount and the Company
         and  the successors  and assigns  of Paramount.  The Company  shall not
         assign  or sell  all or  substantially  all of  the Company's  business
         and/or assets without first requiring  in writing that such assignee or
         successor is bound by the  provisions of this Agreement. This Agreement
         shall be subject  to amendment only in writing signed  by both parties.
         This Agreement  constitutes the  entire agreement  of the  parties with
         respect  to  the  subject  matter  hereof  and   supersedes  any  prior
         understandings or agreements  in so far as they  relate specifically to
         the subject matter hereof.


                                        5
<PAGE>
             Please  confirm  that  the  foregoing is  in  accordance  with your
         understanding by signing and returning  to us the enclosed duplicate of
         this letter.

                                               Sincerely yours,

                                               PARAMOUNT CAPITAL, INC.


                                               By: /s/ Linsay A. Rosenwald
                                                  ----------------------------
                                               Name: Lindsay A. Rosenwald, M.D.
                                               Title: Chairman

         Confirmed as of the date hereof:

         SPARTA PHARMACEUTICALS, INC.


         By:  /s/ W. M. Sullivan
              ----------------------------
              Name:  W. M. Sullivan
              Title: Chairman, President & CEO



                                                               Exhibit 10.70


                    EVALUATION AND OPTION AGREEMENT
                    -------------------------------

    EVALUATION AND OPTION AGREEMENT, dated as of October 25,1995, by

and between Astra Merck Inc., a Delaware corporation ("AMI") and Lexin

Pharmaceutical Corporation, a Pennsylvania corporation ("Lexin").

    IN CONSIDERATION of the respective covenants, representations,

warranties and agreements set forth herein, and intending to be legally

bound hereby, the parties hereto, hereby agree as follows:


                               ARTICLE I

                      EVALUATION AND OPTION GRANT
                      ---------------------------

    1.1. Payment by AMI. Subject to the terms and conditions hereof,
         --------------
and in consideration of the evaluation and option grant set forth in

Section 1.2, AMI shall pay to Lexin the sum of ______ within thirty days 

from the date of this Agreement to be used solely for the purpose of

conducting animal studies of LEX 032 in the treatment of pancreatitis.

The studies shall be completed by Lexin within 180 days from the date

of this Agreement and, subject to the terms and conditions hereof, the

results of the studies shall be available for use by AMI.

    1.2. Evaluation and Option Grant. Lexin hereby grants to AMI
         ---------------------------

an exclusive and irrevocable right to evaluate (i) Patents (as

hereinafter defined) and any intellectual property rights relating

thereto, and (ii) all data, information, know-how and materials,

whether existing now or in the future, relating to the

manufacture, use, stabilization, design and testing of LEX 032 for

the treatment of pancreatitis (collectively, the "Technology")

during the period commencing on the date of this Agreement and

ending ______ year following the receipt of a written report summarizing

the data from the animal studies (the "Period"). Further, Lexin

hereby grants to AMI an exclusive and irrevocable option (the

"Option"), exercisable at any time during the Period, to obtain an

exclusive license under the Patents and
<PAGE>
the Technology for the United States of America, including its

territories, possessions, and Puerto Rico (collectively, the

"Territory"), for the human pharmaceutical treatment of pancreatitis or

other diseases of the gastrointestinal system (whether by prescription,

over-the-counter or otherwise) (the "Field"). During the Period, Lexin

shall not provide to any other party access to the Patents or the

Technology which has not already been provided prior to the date

hereof, or solicit or accept offers to negotiate or otherwise discuss

commercial opportunities regarding the Patents or the Technology for

use in the Field. The Option includes the grant by Lexin to AMI's

parent, Astra AB, of an exclusive option during the Period to negotiate

an agreement for the development and commercialization of products in

the Field and outside the Territory.


    For the purposes of this Agreement, the term "Patents" means (i)

all information relating to those patent applications and any division,

continuation, or continuation-in-part thereof and unexpired United

States patents set forth on Schedule 1.1, any United States patents

granted on the basis of the patent applications set forth in Schedule

1.1 and any division, continuation  or continuation-in-part thereof;

and (ii) any reissue or extension of any of the foregoing patents.


    1.3. Representation and Warranty for Technology. Except as
         ------------------------------------------

otherwise set forth in Schedule 1.3, Lexin represents and warrants to

AMI that (i) to the best of its knowledge, the intellectual property

rights related to Patents and the Technology are subsisting and are not

invalid or unenforceable, in whole or in part; (ii) Lexin has the full

right, power and authority to grant all of the right, title and

interest in the Patents and the Technology under Section 1.2 hereof;

(iii) Lexin has not previously licensed, assigned, transferred,

conveyed or otherwise encumbered such right, title and interest; (iv)

Lexin is the sole and exclusive owner or licensee of the Patents and

the Technology, all of which is free and clear of any liens, charges

and encumbrances, and, except for the licensors listed in Schedule 1.1

hereto, to the best of its knowledge, no other person, corporate or

other private entity, or governmental entity or subdivision thereof has

or shall have any claim of ownership with respect to the Patents or the

Technology; (v) there are no claims, judgments or settlements to be

paid by

                                   -2-
<PAGE>
         the Lexin relating to the Patents or Technology or claims pending

         litigation relating thereto; and (vi) Lexin knows no basis for any

         claims that the Patents or Technology infringes the patents,

         copyrights, trade secrets or other proprietary rights of third parties.

             1.40 Evaluation by AMI. AMI shall evaluate the Patents and the
                  -----------------

         Technology as it deems appropriate in its sole discretion during the

         Period. Lexin shall cooperate with AMI by providing data, information

         and reasonable assistance, including but not limited to, scientists

         participating in face to face scientific meetings with AMI scientists,

         as necessary, so as to enable AMI to properly evaluate the Patents and

         the Technology.


             1.50 Exercise of Option: Terms Of Definitive Agreement. At any time
                  -------------------------------------------------
         during the Period, AMI may exercise the Option (and Astra AB may

         exercise its option described in the last sentence of the first

         paragraph of Section 1.2 hereof) by providing written notice thereof to

         Lexin. Immediately following such notification, the parties shall

         commence negotiations on a definitive agreement(s) and Lexin shall

         grant to AMI and/or Astra AB all rights by an exclusive, sublicensable,

         royalty-bearing license under all know-how and patents arising from the

         Patents to make, have made, use and sell human pharmaceutical products

         (i) in the Field in the Territory (for AMI), and (ii) in the Field

         outside the Territory (for Astra AB), utilizing the Technology pursuant

         to a definitive agreement(s). Such definitive agreement(s) shall

         contain such reasonable terms and conditions which are typical in the

         industry. Such terms shall include, without limitation, that AMI (or

         Astra AB) may terminate the license agreement at any time for any

         reason and that the term of the agreement shall be until the last to

         expire patent licensed thereunder. The proposal by AMI (or Astra AB)

         for the definitive agreement shall include a reasonable compensation

         for the Technology, which compensation may include a reasonable

         royalty. If the parties cannot agree on the terms of the agreement, the

         parties shall submit the matter to arbitration in accordance with

         Article II.

             1.6. Additional Rights. For so long as AMI and Lexin are either in
                  -----------------

         good faith negotiating a definitive agreement in the Field or

         performing under the terms of such definitive agreement, AMI may elect,

         in its sole discretion, to enter into negotiations with

                                   -3-
<PAGE>
         Lexin for exclusive rights to additional applications for compounds

         with a similar mechanism of action or clinical potential as LEX 032, in

         or out of the Field ("Additional Applications") on such terms and

         conditions as the parties may mutually agree, if AMI notifies Lexin of

         its election at any time during the Period or the term of the

         definitive agreement, as the case may be. If AMI makes the foregoing

         election, the parties shall determine in good faith the terms under

         which AMI will have exclusive rights during the Period or the term of

         the definitive agreement, as applicable, to negotiate a definitive

         agreement with Lexin with respect to each such Additional Application.

         If Lexin desires to actively solicit or is approached by a third party

         to negotiate commercial opportunities relating to any Additional

         Application during the Period or the term of the definitive agreement,

         as applicable, Lexin agrees first to provide written notice of such

         intention to AMI. AMI shall have a period of thirty (30) days after

         receipt of such notice during which to advise Lexin as to whether it

         desires to negotiate a definitive agreement with respect to such

         Additional Application, and if it desires to do so, an additional sixty

         (60) day period to negotiate such agreement before Lexin may actively

         solicit or negotiate with another party. If AMI elects not to

         negotiate, then Lexin shall be free to negotiate with third parties as

         to that Additional Application.


             Notwithstanding the foregoing, if AMI elects to negotiate for such

         exclusive rights and the parties fail to consummate a definitive

         agreement with respect thereto, for a period of one (1) year following

         the expiration of AMI's negotiation period, Lexin may not grant rights

         to exploit commercial opportunities with respect to such Additional

         Application using the Patents or the Technology to any third party on

         terms which are in the aggregate materially more favorable than those

         last offered to AMI without first offering such terms to AMI, which AMI

         shall have a period of 30 days to accept. Lexin's obligations under the

         immediately preceding sentence shall survive the termination or

         expiration of this Agreement.

                                   -4-
<PAGE>
                                  ARTICLE II 

                                  ARBITRATION
                                  -----------


             2.1. Arbitration. If the terms of the definitive agreement for
                  -----------

         AMI's Option under Section 1.5 are submitted to arbitration hereunder,

         the matter shall be settled by arbitration by a board of arbitrators

         consisting of an arbitrator appointed by AMI, an arbitrator appointed

         by Lexin and a third arbitrator chosen by the mutual agreement of AMI

         and Lexin, which third arbitrator shall be unrelated either to AMI or

         Lexin. Such arbitration proceedings shall be held in Philadelphia,

         Pennsylvania and shall be held in accordance with the then current

         rules of the American Arbitration Association. Arbitration may be

         commenced at any time by either party hereto giving written notice to

         the other party to a dispute that such dispute has been referred to

         arbitration. The arbitrators shall determine a reasonable price, rate

         and other terms based on the guidelines set forth in this Agreement and

         with reasonable terms based on those typical in the industry and the

         offers or proposals of each party and shall enforce the obligations of

         Lexin and AMI to license the Technology on such terms pursuant to a

         reasonable definitive agreement, the terms of which shall also be

         subject to this arbitration provision should the parties be unable to

         reach agreement. Any award rendered by the arbitrators shall be

         conclusive and binding upon the parties hereto provided, however, that

         any such award shall be accompanied by a written opinion of the

         arbitrators giving the reasons for the award. The provision for

         arbitration shall be specifically enforceable by the parties and the

         decision of the arbitrators in accordance herewith shall be final and

         binding and there shall be no right of appeal therefrom. Each party

         shall pay its own expenses of arbitration and the expenses of the

         arbitrators shall be equally shared, provided, however, that if in the

         opinion of the arbitrators any claim hereunder or any defense or

         objection thereto was unreasonable, the arbitrators may assess, as part

         of their award, all or any part of the arbitration expenses of the

         other party (including reasonable attorneys' fees) and of the

         arbitrators against the party raising such unreasonable claim, defense

         or objection. The arbitration proceeding shall be conducted in English.

                                   -5-
<PAGE>
                                ARTICLE III 

                                MISCELLANEOUS
                                -------------


             3.1. Confidentiality. AMI and Lexin agree that all information
                  ---------------

         relating to the Technology and the terms of this Agreement, disclosed

         by either party in accordance with this Agreement shall be maintained

         by the receiving party in secrecy, and each will use all reasonable

         diligence to prevent disclosure, except to necessary personnel and,
                                                     
         with respect to AMI, necessary personnel of its affiliates. AMI's and

         Lexin's obligations under this Section 3.1 shall be limited to a period

         of five years from the date of this Agreement. The parties shall not

         have any obligation of confidentiality with respect to any information

         that is: (a) in the public domain, other than by a breach of this

         Agreement on the part of the receiving party; (b) rightfully received

         from a third party without any obligation of confidentiality; (c)

         rightfully known to the receiving party without any limitation on use

         or disclosure prior to its receipt from the disclosing party as

         documented in written records; (d) generally made available to third

         parties by the disclosing party without restriction on disclosure; or

         (e) independently developed by the receiving party as documented in

         written records. Any and all information received by either party from

         the other, upon request shall be promptly returned, except that the

         receiving party may retain one copy of such information in its

         confidential files, solely for record purposes.


             3.2. Publication. AMI and Lexin each acknowledge the other party's
                  -----------

         interest in publishing to obtain recognition within the scientific

         community and to advance the state of scientific knowledge. Each party

         also recognizes the mutual interest in obtaining valid patent

         protection and in protecting business interests and trade secret

         information. Consequently, a party wishing to make a publication shall

         deliver to the other party a copy of the proposed written publication

         or an outline of an oral disclosure at least sixty days prior to

         submission for publication or presentation. The reviewing party shall

         have the right to propose modifications to the publication for patent

         reasons, trade secret reasons or business reasons or to request a

         reasonable delay in publication or presentation in order to protect

         patentable information. If a reviewing party requests a delay, the

         publishing party shall delay

                                   -6-
<PAGE>
         submission or presentation for a period of ninety days to enable patent

         applications protecting each party's rights in such information to be

         filed. Upon expiration of such ninety days, the publishing party shall

         be free to proceed with the publication or presentation. If a reviewing

         party requests modifications to the publication, the publishing party

         shall edit such publication to prevent disclosure of trade secret or

         proprietary business information prior to submission of the publication

         or presentation.


             3.3. Governing Law. The interpretation and construction of this
                  -------------

         Agreement, and all matters relating hereto, shall be governed by the

         laws of the Commonwealth of Pennsylvania applicable to agreements

         executed and to be performed solely within such Commonwealth without

         reference to principles of conflicts of laws.


             3.4. Enforcement. Each party shall have the right at all times to
                  -----------

         enforce the provisions of this Agreement in strict accordance with the

         terms hereof notwithstanding any conduct or custom on its part in

         refraining from doing so at any time. The failure of any party at any

         time to enforce its rights hereunder strictly in accordance with the

         same shall not be construed as having created a custom contrary to the

         specific provisions hereof or as having in any way modified or waived

         the same.


             3.5. Notices. Any notice, request, demand, waiver, consent,
                  -------

         approval or other communication which is required or permitted

         hereunder shall be in writing and shall be deemed given only if

         delivered personally or sent by a telegram or telecopier (with

         transmission confirmed) or by registered or certified mail, return

         receipt requested and postage prepaid, or by federal express or an

         equivalent overnight delivery service, addressed

                                   -7-
<PAGE>
         to the parties at their respective addresses as set forth below or to

         such other addresses at which notice of change shall have been duly

         given.


                   If to AMI, to:

                        Astra Merck Inc.
                        725 Chesterbrook Boulevard
                        Wayne, Pennsylvania 19087-5677
                        Attention: Executive Director of Licensing and Business
                        Development

                   If to Lexin, to:

                        Lexin Pharmaceutical Corporation 
                        Rock Plaza III, 111 Rock Road 
                        Horsham, Pennsylvania 19044-2310 
                        Attention: Jerry B. Hook, Ph.D.

         Such notice, request, demand, waiver, consent, approval or other
 
         communication shall be deemed to have been given as of the date so

         delivered, telegraphed, or telecopied, or on the fifth day after

         deposit in the United States mail, or on the second day after the

         deposit with Federal Express or an equivalent overnight delivery

         service. It is understood and agreed that this Section 3.5 is not

         intended to govern the day-to-day business communications necessary

         between the parties in performing their duties, in due course, under

         the terms of this Agreement.

             3.6. Entire Agreement. This Agreement constitutes the entire
                  ----------------

         agreement between the parties with respect to the subject matter hereof

         and all prior agreements with respect thereto are superseded hereby and

         each party confirms that it is not relying on any representations or

         warranties of the other party except as specifically set forth herein,

         No amendment or modifications hereof shall be binding upon the parties

         unless in writing and duly executed by authorized representatives of

         both parties.

             3.7. Binding Effect; Assignment. This Agreement shall inure to the
                  --------------------------
         benefit of and be binding upon the parties and their respective

         successors and permitted assigns. Neither party shall assign this

         Agreement or any of its rights or obligations hereunder without the

                                   -8-
<PAGE>
         prior written consent of the other party, except that Lexin may assign

         its rights and obligations to any entity with which it may merge or

         consolidate, or to which it may transfer substantially all of its

         assets to which this Agreement relates.


             3.8. Survival. The respective rights and obligations of the parties
                  --------

         hereunder shall indefinitely survive the termination or expiration of

         this Agreement to the extent necessary to the intended preservation of

         such rights and obligations.


             3.9. Schedules. All schedules referred to herein or referred to in
                  ---------

         any schedule hereto are intended to be, and hereby are, specifically

         incorporated herein and made a part of this Agreement.


             3.10. Counterparts. This Agreement may be executed in one or more
                   ------------

         counterpart copies, each of which shall be deemed an original and all

         of which taken together shall be deemed to constitute one and the same

         instrument. This Agreement shall become binding when one or more

         counterparts taken together shall have been executed and delivered by

         the parties.


             3.11. Press Releases. Except as required by applicable law, neither
                   --------------

         of the parties hereto shall give notice to any third parties or

         otherwise make any public statement or releases concerning this

         Agreement or the transactions contemplated hereby without obtaining the

         prior written consent of the other party to this Agreement as to the

         contents and manner of presentation and publication thereof, which

         consent shall not be unreasonably withheld.


             3.12. Severability. If any one or more provisions of this Agreement
                   ------------

         shall be held to be invalid, illegal or unenforceable, the validity,

         legality or enforceability of the remaining provisions hereof shall not

         in any way be affected or impaired thereby. To the extent permitted by

         applicable law, each party waives any provision of law which renders

         any provision of this Agreement invalid, illegal or unenforceable in

         any respect. In the event any provision shall be held invalid, illegal

         or unenforceable the parties shall use their best efforts

                                   -9-
<PAGE>
         to substitute a valid, legal and enforceable provision which, insofar

         as practical, implements the purposes hereof.


             3.13. Further Assurances. Each party shall execute such other
                   ------------------

         instruments, give such further assurances and perform such acts which

         are or may become necessary or appropriate to effectuate and carry out

         the provisions of this Agreement.


             3.14. Headings. The article and section headings herein are for
                   --------

         reference purposes only and shall not affect the meaning or

         interpretation hereof.


             IN WITNESS WHEREOF, the parties have caused this Agreement to be

         executed by their officers thereunto duly authorized as of the date

         first set forth above.


           LEXIN PHARMACEUTICAL CORPORATION            ASTRA MERCK INC.


         By: /s/ Jerry B. Hook                         By: /s/ Wayne P. Yetter
             -------------------------------           -----------------------
             Jerry B. Hook                             Wayne P. Yetter
             President and Chief                       President and Chief
             Executive Officer                         Executive Officer

                                   -10-


                                                               Exhibit 10.71


                      COLLAB0RATIVE RESEARCH AND LICENSING AGREEMENT
                      ----------------------------------------------

             This Agreement, dated as of the 1st of April, 1994, between Lexin
         Pharmaceutical Corporation, Pennsylvania Business Campus, Rock Plaza
         III, 111 Rock Road, Horsham, PA 19044-2310 ("LEXIN") and Wichita  
         State University, 1845 N.  Fairmount Avenue, Wichita, Kansas 
         67206-0007 ("UNIVERSITY").

                                       WITNESSETH:

             WHEREAS, UNIVERSITY and LEXIN possess certain know-how in the field
         of small and large serine protease inhibitors for all uses and
         applications (except agricultural uses and applications) and all
         aspects of molecular interaction with serine proteases;

             WHEREAS, UNIVERSITY, on behalf of William C. Groutas, Ph.D. ("DR.
         GROUTAS"), is desirous of and prepared to conduct collaborative 
         research in this field which may lead to the development of 
         commercial products;

             WHEREAS, LEXIN is prepared to provide support to UNIVERSITY for
         such research by DR. GROUTAS, providing it receives certain license
         rights under inventions, biological materials, and/or know-how; and

             WHEREAS, UNIVERSITY represents, subject to potential rights under
         Article III.D hereof, that it has full rights by assignment to such
         inventions, biological materials, and/or know-how and wishes to have
         such inventions, biological materials, and/or know-how perfected and
         marketed in order that products resulting therefrom might be available
         for public use and benefit; and

             WHEREAS, UNIVERSITY represents, subject to potential rights under
         Article III.D hereof, and warrants to LEXIN that: (i) it has full right
         and authority to enter into this Agreement without consent or approval
         of any other party; and (ii) it is not subject to any restrictions
         which would prevent or impair the grant to LEXIN of the licenses.

             NOW, THEREFORE, for valuable consideration, the receipt and
         adequacy of which are hereby acknowledged, and intending to be legally
         bound, the parties hereto mutually agree as follows:
<PAGE>
                                 ARTICLE I - DEFINITIONS
                                 -----------------------

             A.    Research Program. The term "Research Program" shall refer to
                   ----------------
         the work outlined in Appendix A.

             B.    Licensed Invention. The term "Licensed Invention" shall mean
                   ------------------
         any and all technical information, trade secrets, developments,
         discoveries, know-how, methods, techniques, formulae, processes and
         other proprietary ideas, whether or not patentable or copyrightable,
         that are discovered, developed or reduced to practice arising out of
         the research performed under this Agreement, as set forth in Appendix
         A.

             C.    Patent Rights. The term "Patent Rights" shall mean United
                   -------------
         States or foreign patent application rights owned or controlled by
         UNIVERSITY which arise under any United States or foreign patent
         applications, or any patents issuing from said applications, including
         any divisions, continuations, continuations-in-part, re-examinations,
         or reissues thereof and patents of addition thereto, and cover the
         making, using, or selling of Product.

             D.    Product. The term "Product" shall mean any product derived
                   -------
         from a Licensed Invention used in the Field.

             E.    Net Sales. With respect to any quantity of Product subject to
                   ---------
         royalty under this Agreement that is sold by LEXIN or any of its
         sublicensees to any third party, the term "Net Sales" shall mean the
         gross invoice selling price for that quantity of Product, less: (a)
         discounts and allowances to customers,
         (b) credits for returned goods, (c) prepaid freight, (d) sales taxes or
         other governmental charges paid in connection with the sale; and (e)
         commissions and other fees paid to distributors and other sales
         agencies for or in connection with the sale of Product.

             F.    Affiliate. The term "Affiliate" shall mean any corporation,
                   ---------
         company, partnership and/or firm which controls or is controlled by or
         is under common control with LEXIN. For purposes of this Paragraph,
         control shall mean: (a) in the case of corporate entities, direct or
         indirect ownership of at least fifty per cent (50%) of the stock or
         participating shares entitled to vote for the election of directors;
         and (b) in the case of non-corporate entities, direct or indirect
         ownership of at least fifty percent (50%) of the equity interest or the
         power to direct the management and policies of such entity.

             G.    Effective Date. The term "Effective Date" shall mean the date
                   --------------
         first indicated above as the effective date of this Agreement.


                                   2
<PAGE>
             H.    Field. The term "Field" shall mean use for any diagnostic,
                   -----
         therapeutic and/or prophylactic purpose.

                       ARTICLE II - COLLABORATIVE RESEARCH PROGRAM
                       -------------------------------------------

             A.    For the one (1) year ending [              ] (the
         "Research Term"), LEXIN agrees, as as set forth below to pay
         UNIVERSITY funds to support the Research Program, and UNIVERSITY
         shall supply the services of requisite personnel and to furnish
         the necessary facilities to carry out such Research Program, all
         according to a Plan for Research and Budget agreed upon by LEXIN
         and UNIVERSITY as set forth in Paragraph B of this Article.

             B.    The Plan for Research and Budget for the Research Term
         is set forth in Appendix A hereto. The budget for the Research
         Term shall be $[        ], payable quarterly in advance.

             C.    The parties shall have the option to continue the Research
         Program for an additional period after the Research Term, under
         substantially identical terms as set forth herein; however, continued
         funding shall be solely at the discretion of LEXIN.

             D.    The Research Program shall be under the direction of DR.
         GROUTAS. In the event that the services of DR. GROUTAS become
         unavailable during the course of the Research Program, LEXIN may
         terminate the Research Program by giving written notice to UNIVERSITY
         and reimbursing UNIVERSITY for all previously incurred and
         noncancellable expenses for the Research Program.

             E.    UNIVERSITY shall report in writing to LEXIN the results and
         status of its research under this Agreement within fifteen (15) days
         after the end of each six (6) month period hereunder. At the conclusion
         of the Agreement, LEXIN shall receive a complete detailed report of the
         work carried out and funded by this Agreement. Further, DR. GROUTAS and
         the staff engaged on the Research Program shall be available at times
         mutually agreed upon for the purpose of discussing the progress of the
         Research Program. In the event of termination of the Research Program,
         LEXIN shall receive a final summary report of all work carried out and
         all inventions conceived and/or arising out of the research performed
         under this Agreement.

                                ARTICLE III- PATENT RIGHTS
                                --------------------------

             A.    UNIVERSITY will promptly inform LEXIN of any ideas,
         improvements and inventions arising out of the research performed under
         this Agreement solely by UNIVERSITY personnel or by UNIVERSITY
         personnel jointly with employees of LEXIN.


                                   3
<PAGE>
         Inventions, including biological materials, made solely by UNIVERSITY
         personnel and any patent applications and patents thereon shall be
         owned by UNIVERSITY. Inventions made jointly by UNIVERSITY personnel
         with LEXIN employees and any patent applications and patents thereon
         shall be jointly owned by UNIVERSITY and LEXIN.

             B.    UNIVERSITY shall be responsible for filing and prosecuting
         United States and foreign patent applications on inventions owned
         solely by UNIVERSITY. Both UNIVERSITY and LEXIN shall be mutually
         responsible for making decisions regarding the scope and content of any
         such applications and prosecution thereof. The expenses in connection
         with filing and prosecution of any applications for University-owned
         patents or patents jointly owned with LEXIN, United States and/or
         foreign and the maintenance of issued patents thereon shall be borne by
         LEXIN. All expenses incurred by LEXIN in applying for patent protection
         relating to inventions conceived by UNIVERSITY shall be creditable
         against any future royalty payments due UNIVERSITY by LEXIN; however,
         royalties due UNIVERSITY in any payment period shall not be reduced to
         less than 50% of what they otherwise would have been.

             C.    LEXIN shall be entitled to file and prosecute United States
         and/or foreign patent applications on jointly owned inventions.
         UNIVERSITY and LEXIN shall be jointly responsible for making decisions
         regarding the scope and content of applications and prosecution thereof
         on any such jointly owned inventions. UNIVERSITY will be expected to
         assist in assembling inventorship information and data for filing
         patent applications on jointly owned inventions. Decisions on when,
         where and whether to file on jointly owned inventions will be made by
         LEXIN after consulting with UNIVERSITY. The expenses in connection with
         filing and prosecution of any jointly owned patent applications, United
         States and/or foreign, and the maintenance of issued patents thereon
         shall be borne by LEXIN. All expenses incurred by LEXIN in applying for
         patent protection relating to inventions conceived jointly with
         UNIVERSITY shall be creditable against any future royalty payments due
         UNIVERSITY by LEXIN; however, royalties due UNIVERSITY in any payment
         period shall not be reduced to less than 50% of what they otherwise
         would have been.

             D.    LEXIN acknowledges that certain ideas, improvements and
         inventions arising out of the research performed under this Agreement
         by UNIVERSITY personnel may be subject to rights retained by the United
         States government in accordance with P.L. 96-517, as amended by P.L.
         98-620, and any regulations issued thereunder.


                                       4
<PAGE>
                              ARTICLE IV - LICENSE TO LEXIN
                              -----------------------------

             A.    In consideration of LEXIN's support for research and other
         consideration hereunder, UNIVERSITY hereby grants to LEXIN:

                   (1) an exclusive, worldwide license to make, have made, use,
                       sell and have sold Product derived from Licensed
                       Invention or deviations; and

                   (2) an exclusive, worldwide license under Patent Rights to
                       make, have made, use, sell and have sold Product.

             B.    The licenses granted by UNIVERSITY to LEXIN under Paragraph A
         of this Article shall include the right to grant sublicenses of no
         greater scope than the license granted to LEXIN hereunder.

             C.    During the term of this Agreement and so long as LEXIN is not
         in default with respect to any payment due to UNIVERSITY hereunder,
         UNIVERSITY will not assert Patent Rights or Licensed Patent to prevent
         any party from using or selling any quantity of Product on which
         royalty has been paid hereunder.

                      ARTICLE V - ROYALTIES AND OTHER CONSIDERATION
                      ---------------------------------------------

             A.    In  consideration of the licenses granted to LEXIN under this
         Agreement, LEXIN shall pay UNIVERSITY a royalty of [         
                     ] ([  ]) on the Net Sales of Product derived from Licensed
         inventions or deviations covered by a claim contained in an issued
         Patent Right on a country by country basis.

             B.    In the event that LEXIN or a sublicense of LEXIN must pay
         additional royalties to a third or additional parties to allow for
         commercialization of Product developed under this Agreement, LEXIN and
         the University shall agree to negotiate in good faith to consider
         whether offset of royalty payments is required based upon the
         circumstances and, if required, LEXIN shall have the right to reduce
         royalty payments to UNIVERSITY in a manner consistent with the need to
         offset such additional royalty payments.

                      ARTICLE VI - REPORTS, PAYMENTS AND ACCOUNTING
                      ---------------------------------------------

             A.    Upon first commercial sale of Product, LEXIN shall provide to
         UNIVERSITY, within ninety (90) days following each calendar quarter, a
         written report setting forth the total Net Sales and the royalty due
         and payable to UNIVERSITY for such quarter and LEXIN shall remit to
         UNIVERSITY with such report the


                                        5
<PAGE>
         amount of royalty payments shown thereby to be due. Royalties shall be
         payable from the country in which they are earned and subject to
         foreign exchange rates then prevailing in such country. Royalties shall
         be remitted in United States dollars. For converting any royalty that
         accrued in another currency into United States dollars, there shall be
         used the closing buying rates quoted by the [Morgan Guaranty Trust
         Company of New York, New York] for the last business day of the
         calendar quarter in which the royalties were earned.

             B.    LEXIN shall keep complete and accurate records for the latest
         three (3) years showing the Net Sales by LEXIN of Product made under
         this Agreement. Such records shall be in sufficient detail to enable
         the royalties payable hereunder by LEXIN to be determined. LEXIN agrees
         to permit such books and records to be examined but not more often than
         once in any calendar year. The examination shall be by an independent
         certified public accountant designated by UNIVERSITY and reasonably
         acceptable to and approved by LEXIN. Any such audit shall be at the
         expense of UNIVERSITY and conducted during business hours of LEXIN and
         upon reasonable notice to LEXIN. The purpose of any such audit shall
         solely be for verifying the royalties payable as provided for in this
         Agreement and said accountant shall only disclose Net Sales to
         UNIVERSITY and royalties due and payable thereon.

             C.    Any tax required to be withheld by LEXIN under the laws or
         governmental regulations of any country for royalties payable to
         UNIVERSITY shall be promptly paid by LEXIN for and on behalf of
         UNIVERSITY to the appropriate governmental authority. LEXIN shall
         furnish UNIVERSITY with proof of payment of such tax together with
         official or other appropriate evidence issued by the appropriate
         government authority sufficient to enable UNIVERSITY to support a claim
         for any income tax credit in respect of any tax so paid.

                            ARTICLE VII - TERM AND TERMINATION
                            ----------------------------------

             A.    This Agreement, unless terminated earlier as hereinafter
         provided, shall terminate on the [            ] anniversary of its 
         Effective Date or the expiration of the last of the patents licensed 
         hereunder on a country by country basis, whichever date shall last 
         occur, whereupon the exclusive licenses granted hereunder shall be 
         fully paid and LEXIN and its sublicensees shall be free to make, 
         have made, use and sell Product without further duties or 
         responsibilities to UNIVERSITY.

             B. If any of the terms or conditions of this Agreement are breached
         and such breach is not corrected within sixty (60) days after written
         notice thereof is given by a complaining  party to the breaching party,
         the complaining party shall have the option


                                        6
<PAGE>
         to terminate this Agreement by giving written notice thereof to the
         breaching party.

                               ARTICLE VIII - ASSIGNABILITY
                               ----------------------------

             LEXIN may, without the prior written consent of UNIVERSITY, assign
         this Agreement or any of its rights or obligations hereunder to an
         Affiliate. Such assignee may, without the prior written consent of
         UNIVERSITY, assign such Agreement or rights or obligations hereunder
         back to LEXIN or to an Affiliate without the prior written consent of
         UNIVERSITY. Neither this Agreement nor any of the rights or obligations
         of UNIVERSITY hereunder shall be assignable or otherwise transferable
         by UNIVERSITY without the prior written consent of LEXIN.

                            ARTICLE IX- DEVELOPMENT OF PRODUCT
                            ----------------------------------

             LEXIN shall use reasonable diligence in the development of Product
         and to introduce or cause the introduction of Product in the commercial
         market at a reasonable date.

                                 ARTICLE X - PUBLICATIONS
                                 ------------------------

             LEXIN reserves the right to approve publications resulting from the
         research under this Agreement in advance of submission for publication
         in order to protect its proprietary technology including biological
         materials, information and know-how. LEXIN shall have the final
         authority to determine the scope and content of any publication
         materials which contain information relating to LEXIN's proprietary
         technology including identification of or reference to biological
         materials supplied by LEXIN to UNIVERSITY, information and know-how.
         UNIVERSITY shall submit any prepublication materials to LEXIN for
         review and comment at least sixty (60) days prior to planned submission
         for publication. LEXIN shall notify UNIVERSITY within thirty (30) days
         of receipt of the prepublication materials of its intention to approve
         or withhold approval of the publication and state the reason for doing
         so; provided, however, that LEXIN shall not withhold approval for more
         than thirty (30) days to provide LEXIN the opportunity to file patents
         to protect its technology.
         Except as otherwise  provided herein, LEXIN may use the results of the
         Research Program for whatever purposes it may desire.


                                        7
<PAGE>
                            ARTICLE XI - STATUS OF THE PARTIES
                            ----------------------------------

             For purposes of this Agreement and in connection with any activity
         of UNIVERSITY hereunder, UNIVERSITY shall at all times be an
         independent contractor and not an employee or agent of LEXIN.
         UNIVERSITY's activities in connection with the Research Project will be
         conducted by UNIVERSITY at its own risk. UNIVERSITY shall have full
         authority and responsibility for its activities under the Collaborative
         Research Program. People working for UNIVERSITY under the Research
         Program shall be employees, agents or students of UNIVERSITY and shall
         not be employees of LEXIN.

                              ARTICLE XII - CONFIDENTIALITY
                              -----------------------------

             Except as is necessary for LEXIN to practice commercially under the
         rights granted herein, all proprietary information disclosed by either
         party to the other hereunder shall be received by the receiving party
         (including all appropriate employees, agents and independent
         contractors) in strictest confidence and used solely in furtherance of
         this Agreement, and shall be accorded the same degree of
         confidentiality and secrecy with which the receiving party holds its
         own most confidential information of a similar nature, but in no event
         less than reasonable care. Such confidential information, subject to
         the provisions of the Kansas Open Records Act, K.S.A. 45-201 et. seq.
                                                                      --  ---
         (Supp. 1987), shall not be disclosed to any persons other than: (i)
         employees or agents of the receiving party or independent contractors
         employed by the receiving party who have reasonable need for access to
         such information in connection with the receiving party's performance
         under this Agreement and who are bound to the receiving party by a
         written agreement of confidentiality containing terms consistent with
         those contained in this Agreement; and (ii) governmental authorities,
         as required, to obtain necessary regulatory clearances. Information
         shall not be deemed to be proprietary information and such restrictions
         shall not apply to any such information: (a) which is, or subsequently
         may become, within the knowledge of the general public, without the
         fault of the receiving party, (b) which is known to the receiving 
         party prior to the time of receipt thereof from the disclosing party, 
         as shown by competent written records, (c) which is proved to have 
         been developed by the receiving party independently and wholly 
         without resort to the proprietary information of the disclosing 
         party, as shown by competent written records; or (d) which is 
         subsequently rightfully obtained from sources other than the 
         disclosing party and without confidential restriction in favor of 
         the disclosing party.


                                        8
<PAGE>
                         ARTICLE XIII - ABATEMENT OF INFRINGEMENT
                         ----------------------------------------

             If at any time any third party shall infringe any unexpired patent
         licensed hereunder and LEXIN or UNIVERSITY shall give notice in writing
         to the other of the existence of such infringement, then LEXIN may at
         its election bring suit in its own name against such infringer. Should
         LEXIN bring suit in its own name, UNIVERSITY shall execute such legal
         papers necessary for the prosecution of such suit as may be requested
         by LEXIN, and LEXIN shall be liable for all costs and expenses of such
         litigation and shall be entitled to receive and retain all recoveries
         therefrom, subject to payment to UNIVERSITY of five percent (5%) of the
         amount by which such recovery exceeds LEXIN's out-of-pocket expenses
         for such litigation. Should LEXIN not institute suit within 120 days of
         notice of the infringement, UNIVERSITY shall have the right but not the
         obligation to bring suit in its own name against such infringer. Should
         UNIVERSITY bring suit in its own name, LEXIN shall execute such legal
         papers necessary for the prosecution of such suit as may be requested
         by UNIVERSITY, and UNIVERSITY shall be responsible for all costs and
         expenses of such litigation and shall be entitled to receive and retain
         all recoveries therefrom.

                                  ARTICLE XIV - NOTICES
                                  ---------------------

             Any notice required under this Agreement shall be considered given
         upon the earlier of: (i) when actually received at the address set
         forth below; or (ii) two business days after such notice, properly
         addressed and shipped overnight service, is sent by either party to the
         other. The proper addresses for notice are as follows:

                   if to UNIVERSITY:

                        Wichita State University
                        1845 N. Fairmount Avenue
                        Office of Research Administration 
                        Wichita, Kansas 67206
                        Attention: Harry Williford

                   if to LEXIN:

                        Lexin Pharmaceutical Corporation 
                        Pennsylvania Business Campus 
                        Rock Plaza III 
                        111 Rock Road
                        Horsham, Pennsylvania 19044-2310 
                        Attention: Jerry B. Hook, Ph.D.
                                   President and Chief 
                                    Executive Officer


                                     9
<PAGE>
                   with a copy to:

                        James A. Lebovitz, Esquire 
                        Ballard Spahr Andrews & Ingersoll 
                        1735 Market Street
                        Philadelphia, Pennsylvania 19103


                                ARTICLE XV - MISCELLANEOUS
                                --------------------------

             A.    This Agreement shall be governed by and construed in
         accordance with the internal laws of the State of Kansas. In the event
         of any dispute arising hereunder, UNIVERSITY agrees that personal
         jurisdiction and venue in any suit between LEXIN and UNIVERSITY shall
         be exclusively in either the United States District Court for the
         District of Kansas or the Court of Common Pleas of Sedgwick County,
         Kansas.

             B.    UNIVERSITY and LEXIN agree that each party to this Agreement
         is operating as an independent contractor and not as an agent of the
         other. This Agreement shall not constitute a partnership or joint
         venture, and neither party may be bound by the other to any contract,
         arrangement or understanding except as specifically stated herein.

             C.    This Agreement constitutes the entire agreement between the
         parties hereto with respect to the subject matter hereof and as such
         supersedes all previous written and oral negotiations, agreements,
         contracts, representations, letters of intent, understandings and
         commitments with respect thereto. This Agreement may be modified,
         discharged, amended, or extended only by a writing signed by a duly
         authorized representative of the parties.

             D. Neither LEXIN nor UNIVERSITY shall make any news release or
         other public statement, whether to the press, stockholders or
         otherwise, disclosing the terms of this Agreement or of any amendment
         hereto, or to performance hereunder or the existence of the arrangement
         between the parties shall be originated by either LEXIN or UNIVERSITY
         or their employees without the prior written approval of the other
         party except as required by law.

             E.    The provisions found in the Contractual Provisions Attachment
         (Form DA-146a), which is attached hereto as Appendix B and executed by
         the parties to this Agreement, are hereby incorporated in this contract
         and made a part hereof.


                                     10
<PAGE>
             IN WITNESS WHEREOF, and intending to be bound hereby, the parties
         have caused this Agreement to be signed by their duly authorized
         representatives,


         LEXIN PHARMACEUTICAL CORPORATION


         By:      /s/ Jerry B. Hook
                  ---------------------------------
         Name:    Jerry B. Hook
                  ---------------------------------
         Title:   President
                  ---------------------------------
         Date:    23 May 1994
                  ---------------------------------


         WICHITA STATE UNIVERSITY


         By:      /s/ Harry G. Williford
                  ---------------------------------
         Name:    Harry G. Williford
                  ---------------------------------
         Title:   Director, Research Administration
                  ---------------------------------
         Date:    5/27/94
                  ---------------------------------


         AGREED TO AND ACCEPTED BY: 

         WILLIAM C. GROUTAS, Ph. D.


         By:      /s/ William C. Groutas
                  ---------------------------------
         Name:    William C. Groutas
                  ---------------------------------
         Title:   Endowment Assn. Distinguished
                  ---------------------------------
                    Professor of Chemistry
                  ---------------------------------
         Date:    May 26, 1994    
                  ---------------------------------


                                   11
<PAGE>
                               APPENDIX A 


                            RESEARCH PROGRAM
                            ----------------


                                     12
<PAGE>
         Proposed Research                                   Scores
         ----------------- 
<PAGE>
                               Financial Plan

             The project will require per year, beginning in 1994:
<PAGE>
                                     Amendment No. 1
                    to Collaborative Research and Licensing Agreement

         This Amendment No 1 is made this 19th day of January, 1995 between
         Lexin Pharmaceutical Corporation, Pennsylvania Business Campus,
         Horsham, PA 19044-2310 ("Lexin") and Wichita State University, 1845 N.
         Fairmount Avenue, Wichita, Kansas 67206-0007 ("University").

                                         RECITALS

         A. Lexin and the University entered into a Collaborative Research and
         Licensing Agreement ("Agreement") dated April 1, 1994.

         B. The parties desire to extend the term of the Agreement for an
         additional one year term.

         NOW,  THEREFORE,  in consideration  of  the  promises  and  the  mutual
         covenants  contained herein,  and intending  to be  legally bound,  the
         parties hereto agree as follows:

         1. The term of this agreement is hereby extended to cover the 
            period [               ]

         2. Except as  expressly amended herein, all other  terms and conditions
         of the Agreement shall remain in full force and effect.

         IN WITNESS WHEREOF, the parties hereto have duly executed this
         Amendment No. 1 as of the date first above written.

                                            FOR WICHITA STATE 
                                            UNIVERSITY


                                            By:    /s/ Harry E. Williford
                                                   ----------------------------
                                            Name:  Harry E. Williford
                                                   ----------------------------
                                            Title: Director Research 
                                                     Administration
                                                   ----------------------------


                                            FOR LEXIN PHARMACEUTICAL 
                                            CORPORATION


                                            By:    /s/ Jerry B. Hook
                                                   ----------------------------
                                                   Jerry B. Hook, Ph.D.
                                                   President & C.E.O.
<PAGE>
State of Kansas                                Agency No.___ Contract No._____
Department of Administration
Division of Accounts and Reports
DA-1162 (Rev. 9-93)


                      CONTRACTUAL PROVISONS ATTACHMENT

Important:     This form contains mandatory contract provisions and must be
               attached to or incorporated in all copies of any contractual
               agreement.  If it is attached to the vendor/contractor's
               standard contract from, then that form must be altered to
               contain the following provision:

               "The provisions found in Contractual Provisions Attachment
               (form DA-146a), which is attached hereto, are hereby
               incorporated in this contract and made a part hereof".

The parties agree that the following provisions are hereby incorporated
into the contract to which it is attached and made a part thereof, said
contract being the ____day of ______________________, 19_____

1.   TERMS HEREIN CONTROLLING PROVISIONS
     -----------------------------------
     It is expressly agreed that the terms of each and every provision in
     this attachment shall prevail and control over the terms of any other
     conflicting provision in any other document relating to and a part of
     the contract in which this attachment is incorporated.

2.   AGREEMENT WITH KANSAS LAW
     -------------------------
     All contractual agreements shall be subject to, governed by, and
     construed according to the laws of State of Kansas.

3.   TERMINATION DUE TO LACK OF FUNDING APPROPRIATION
     ------------------------------------------------
     If, in the judgement of the Director of Accounts and Reports,
     Department of Administration, sufficient funds are not appropriated to
     continue the function performed in this agreement and for the payment
     of the charges hereunder, State may terminate this agreement at the
     end of its current fiscal year.  State agrees to give written notice
     of termination to contractor at least 30 days prior to the end of its
     current fiscal year, and shall give such notice for a greater period
     prior to the end of such fiscal year as may be provided in this
     contract, except that such notice shall not be required prior to 90
     days before the end of such fiscal year.  Contractor shall have the
     right, at the end of such fiscal year, to take possession of any
     equipment provided State under the contract.  State will pay to the
     contractor all regular contractual payments incurred through the end
     of such fiscal year, plus contractual charges incidental to the return
     of any such equipment.  Upon termination of the agreement by State,
     title to any such equipment shall revert to contractor at the end of
     State's current fiscal year.  Ther termination of the contract
     pursuant to this paragraph shall not cause any penalty to be charged
     to the agency or the contractor.

4.   DISCLAIMER OF LIABLILTY
     -----------------------
     Neither the State of Kansas nor any agency thereof shall hold harmless
     or indeminfy any contractor beyond that liability incurred under the
     Kansas Tort Claims Act (K.S.A. 75-6101 et seq.).
                                            -- ---

5.   ANTI-DISCRIMINATION CLAUSE
     --------------------------
     The contractor agrees: (a) to comply with Kansas Act Against
     Discrimination (K.S.A. 44-1001 et seq.) and the Kansas Age
                                    -- ---
     Discrimination in Employment Act (K.S.A 44-1111 et seq.) and the
                                                     -- ---
     applicable provisions of the Americans with Disabilities Act (42
     U.S.C. 12101 et seq.) (ADA) and to not discriminate against any person
                  -- ---
     because of race, religion, color, sex, disability, national origin or
     ancestry, or age in the admission or access to, or treatment or
     employment in, its programs or activities; (b) to include in all
     solicitations or advertisements for employees, the phrase "equal
     opportunity employer"; (c) to comply with the reporting requirements
     set out at K.S.A. 44-1031 and K.S.A. 44-1116; (d) to include those
     provisions in every subcontract or purchase order so that they are
     binding upon such subcontractor or vendor; (e) that a fialure to
     comply with the reporting requirements of (c) above or if the
     contractor is found guilty of any violation of such acts by the Kansas
     Human Rights Commission, such violation shall constitute a breach of
     contract and the contract may be canceled, terminated or suspended, in
     whole or in part, by the contracting state agency or the Kansas
     Department of Administration; (f) if it is determined that the
     contractor has violated applicable provisions of the ADA, such
     violation shall constitute a breach of contract and the contract may
     be canceled, terminated or suspended, in whole or in part, by the
     contracting state agency or the Kansas Department of Administration.

     Parties to this contract understand that the provisions of this
     paragraph number 5 (with the exception of those provisions relating to
     the ADA) are not applicable to a contractor who employs fewer than
     four employees during the term of such contract or whose contracts
     with the contracting state agency cumulatively total $5,000 or less
     during the fiscal year of such agency.

6.   ACCEPTANCE OF CONTRACT
     ----------------------
     This contract shall not be considered accepted, approved or otherwise
     effective until the statutorily required approvals and certifications
     have been given.

7.   ARBITRATION, DAMAGES, WARRANTIES
     --------------------------------
     Notwithstanding any language to the contrary, no interpretation shall
     be allowed to find the State or any agency thereof has agreed to
     binding arbitration, or the payment of damages or penalties upon the
     occurrence of a contingency.  Further, the State of Kansas shall not
     agree to pay attorney fees and late payment charges beyond those
     available under the Kansas Prompt Payment Act (K.S.A. 75-6403), and no
     provision will be given effect which attempts to exclude, modify,
     disclaim or otherwise attempt to limit implied warranties of
     merchantability and fitness for a particular purpose.

8.   REPRESENTATIVE'S AUTHORITY TO CONTRACT
     --------------------------------------
     By signing this document, the representative of the contractor thereby
     represents that such person is duly authorized by the contractor to
     execute this document on behalf of the contractor and that the
     contractor agrees to be bound by the provisions thereof.

9.   RESPONSIBILITY FOR TAXES
     ------------------------
     The State of Kansas shall not be responsible for, nor indemnify a
     contractor for, any federal, state or local taxes which may be imposed
     or levied upon the subject matter of this contract.

10.  INSURANCE
     ---------
     The State of Kansas shall not be required to purchase any insurance
     against loss or damage to any personal property to which this contract
     relates, nor shall this contract require the State to establish a
     "self-insurance" fund to protect against any such loss or damage. 
     Subject to the provisions of the Kansas Tort Claims Act (K.S.A. 75-
     6101 et seq.), the vendor or lessor shall bear the risk of any loss or
          -- ---
     damage to any personal property in which vendor or lessor holds title.

11.  INFORMATION
     -----------
     No provisions of this contract shall be construed as limiting the
     Legislative Division of Post Audit from having access to information
     pursuant


                                                               Exhibit 10.72


                                LICENSE AGREEMENT


                                     between


                             PI RESEARCH CORPORATION 

                                     and the


                      TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA 


                                        for


                                ALPHA ANTICHYMOTRYPSIN 


                                         and


                                  C1 ESTERASE INHIBITOR


                                     JANUARY 2, 1992
<PAGE>
               License between PI Research Corporation and the Trustees of
                              the University of Pennsylvania

                                         Contents

         License Agreement for Alpha-1 Antichymotrypsin
                                      and C1 Esterase Inhibitor

         Attachment A:   Protatek Cooperative Research Agreement
                               of 10/1/87 ("Protatek CRA")

         Attachment B:   Protatek Alpha-1 Antichymotrypsin License

         Attachment C:   Protatek C1 Esterase License Agreement

         Attachment D:   Protatek-PIRC-Penn Assignment Agreement
                                   of 9/6/91

         Attachment E:   PIRC/Penn Stock Purchase Agreement; PIRC
                                    Charter and By-Laws

         Attachment F:   PIRC/Penn Collaborative Research Agreement
                                    of 3/1/91

                         Attachment 1:  Scope of Work and
                                              Schedule of Payments
                         Attachment 2:  Additional Provisions
                                              for License Agreement
                         Attachment 3:  Confidentiality Agreement

         Attachment G:   Rubin Stock Agreement

         Attachment H:   Rubin Consultancy Agreement

         Attachment I:   Cooperman Stock Agreement

         Attachment J:   Cooperman Consultancy Agreement

         Attachment K:   Schechter Stock Agreement

         Attachment L:   Schechter Consultancy Agreement

         Attachment M:   Mei-Wang Stock Agreement

         Attachment N:   Mei-Wang Consultancy Agreement

         Attachment O:   Letter Agreement among Investigators and
                                      University
<PAGE>
                                                               Signature Version

                                  License Agreement for
                               Alpha-1 Antichymotrypsin and
                                  C1 Esterase Inhibitor

             This LICENSE AGREEMENT is made as of the Second day of January,
         1992 by and between THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA, a
         nonprofit corporation organized and existing under the laws of the
         Commonwealth of Pennsylvania (the "University"), PI Research
         Corporation, a corporation organized and existing under the laws of
         Delaware ("Licensee" or "Company").

                                     R E C I T A L S

             A. On October 1, 1987 Protatek International, Inc. ("Protatek"), a
         company then based in Minneapolis, MN entered a cooperative research
         agreement with the University for the development of human protease
         inhibitors. This Agreement is appended as Attachment A and is referred
         to as "Protatek CRA."

             B. Dr. Harvey Rubin, an assistant professor of medicine at the
         University, was the principal investigator under the Protatek CRA and
         has assigned all rights, title and interest in and to the Licensed
         Technology (as defined below) to the University.

             C. On September 27, 1988, Protatek, which had moved to St. Paul, MN
         in the  intervening  period, entered  two License  Agreements with  the
         University.  One  of  these  agreements  was  for  the  human  protease
         inhibitor, alpha-1 Antichymotrypsin (Attachment B). The second of these
         agreements was for the human  protease inhibitor, C1 Esterase Inhibitor
         (Attachment C).

             D. Protatek has offered, and the Company has accepted, an agreement
         ("Attachment D"), dated September 6, 1991, under which certain rights
         held by Protatek virtue of the cooperative research and license
         agreements in Attachments A, B, and C were assigned by Protatek to
         Licensee in exchange for considerations to Protatek and University as
         described in Attachment D and Stock Purchase Agreement
         (Attachment E).

             E. Company has undertaken and fulfilled the obligations of Protatek
         to University under the cooperative research agreement in Attachment A,
         which has terminated. Company and
<PAGE>
         License Agreement between PI Research Corporation and Penn            2
         January 2, 1992

         University desire to continue cooperative research under a new
         Collaborative Research Agreement with the University, dated March 1,
         1991 ("Collaborative Research Agreement"), and appended as Attachment
         F.

             F. In order to clarify, update and expand the terms of the license
         arrangements set forth in Attachments B and C, Company and University
         hereby agree that this License Agreement ("Agreement") is in
         substitution for and replaces the license agreements in Attachments B
         and C, which agreements the parties agree shall be automatically
         terminated upon execution of this Agreement.

         NOW, THEREFORE, in consideration of the premises and mutual covenants
         contained herein, and intending to be legally bound hereby, the parties
         hereto agree as follows:

                               ARTICLE 1: DEFINITIONS

         1.1          Definitions. This Agreement has several defined
                      -----------
         terms in common with the Collaborative Research Agreement. The
         following terms as set forth herein shall have the following meaning:

         1.2          "Affiliate" means, when used with reference to Licensee,
                      ----------
         any person directly or indirectly controlling, controlled by or under
         common control with Licensee. For purposes of this Agreement, "control"
         means the direct or indirect ownership of over 50% of the outstanding
         voting securities of an entity, or the right to receive over 50% of the
         profits or earnings of a person, or the right to control the policy
         decisions of a person.

         1.3          "Bankruptcy Event" means the person in question becomes
                       ----------------
         insolvent, or voluntary or involuntary proceedings by or against such
         person are instituted in bankruptcy or under such insolvency law, or a
         receiver or custodian is appointed for such person, or proceedings are
         instituted by or against such person for corporate reorganization or
         the dissolution of such person, which proceedings, if voluntary, shall
         not have been dismissed within sixty (60) days after the date of
         filing, or such person makes an assignment for the benefit of
         creditors, or substantially all of the assets of such person are seized
         or attached and not released within sixty (60) days thereafter.

         1.4          "Calendar Quarter" means each three-month period, or any
                       ----------------
         portion thereof, beginning on January 1, April 1, July 1 and October 1.

         1.5          "Confidential Information" means (i) the Technical
                       ------------------------
         Information, (ii) any other information or material in tangible form
         that is marked as confidential or proprietary by the furnishing party
         at the time it is delivered to the receiving party, and (iii)
         information that is furnished
<PAGE>
         License Agreement between PI Research Corporation and Penn          3 
         January 2, 1992

         orally if the furnishing party identifies such information as
         confidential or proprietary when it is disclosed and confirms such
         designation in writing within 30 days after such disclosure.

         1.6         "Drug" means (i) an article intended for use in the
                      ----
         diagnosis, cure, mitigation, treatment, or prevention of disease in man
         or other animals; or (ii) an article intended to affect the structure
         of any function of the body of man or other animals that requires FDA
         approval as a drug.

         1.7          "Effective Date" means the first date when the University
                       --------------
         and Licensee have executed this Agreement.

         1.8          "Federal Government Interest" means the rights, if
                       ---------------------------
         applicable, of the United States Government under Public Laws 96-517,
         97-256 and 98-620, codified at 35 U.S.C. Paragraphs 200-212, and any
         regulations issued thereunder, as such statute or regulations may be
         amended from time to time hereafter.

         1.9          "Field" means Technical Information, technology and know-
                       -----
         how relating to the protease inhibitors alpha-1 Antichymotrypsin and C-
         1 Esterase Inhibitor, and improvements related thereto developed by Dr.
         Harvey Rubin and/or any other Investigator, or University laboratory
         personnel during the performance of the Collaborative Research
         Agreement.

         1.10        "Joint Patented Product" means anything which is made, made
                      ----------------------
         for, used or sold, which manufacture, use or sale is covered by any
         Valid Claim of a Joint Patent in any country.

         1.11        "Joint Patents" means patents and patent applications
                     ---------------
         together with any and all patents issuing thereupon, continuation,
         divisional, and re-issue applications thereof and continuation-in-part
         applications thereof claiming inventions within the Field and any
         United States or foreign patents granted upon such applications based
         upon inventions and improvements discovered or made by Principal
         Investigator and/or any other Investigator jointly with one or more
         inventors of Licensee, within the Field during the term of this
         Agreement or the Collaborative Research Agreement.

         1.12        "Licensed Patents" means United States Patent Applications,
                     ------------------
         Serial Numbers 370,704, "Alpha-1 Antichymotrypsin Analogues and Methods
         of Production and any patent applications filed by the University on C1
         Esterase Inhibitors, and related foreign patents and patent
         applications, if any, together with any and all patents issuing
         thereupon, including continuation, divisional and re-issue application
         and continuation-in-part applications
<PAGE>
         License Agreement between PI Research Corporation and Penn            4
         January 2, 1992

         thereof claiming inventions within the Field, and any United States or
         foreign patents granted upon such applications based upon inventions
         and improvements discovered by University through Dr. Harvey Rubin
         and/or any other Investigator or University laboratory personnel within
         the Field during the term of this Agreement or as a result of
         performance of the Work Scope set forth in the Collaborative Research
         Agreement between the parties.

         1.13        "Licensed Product(s)" means and includes all products the
                     ---------------------
         manufacture, composition, use, sale or other disposition of which (i)
         is subject to one or more Valid Claims of a Licensed Patent or (ii) is
         subject to one or more Valid Claims of a Joint Patent.

         1.14        "Licensed Technology" means the Licensed Patents and the
                     ---------------------
         Technical Information.

         1.15         "Net Sales Price" means the gross amount charged by
                      -----------------
         Licensee for the sale of a Licensed Product, net of returns and credits
         for rejected goods, and after deducting (i) trade, quantity and cash
         discounts actually allowed, (ii) sales, use or other similar taxes, 
         the legal incidence of which is on Licensee, and (iii) freight 
         allowances, packing charges, insurance and customs duties, to the 
         extent any of the foregoing are identified on the invoice for the 
         Licensed Product, and (iv) uncollectible receivables which are past 
         due 120 days or more. If a Licensed Product is sold for consideration 
         other than solely cash, the fair market value of such other 
         consideration shall be included in the Net Sales Price.

         1.16          "Person" or "person" means any corporation, partnership,
                       --------    --------
         joint venture or natural person.

         1.17        "Principal Investigator" or "Investigators" refers
                     ------------------------    ---------------
         respectively to the Principal Investigator Harvey Rubin, M.D., Ph.D.,
         Assistant Professor of Medicine at University, and to Investigators
         Barry S. Cooperman, Ph.D., Professor of Chemistry, Norman Schechter,
         Ph.D., Research Professor of Dermatology and Zai-Mei Wang, Ph.D.,
         Research Associate Infectious Diseases, all at University.

         1.18         "Sale," "sale" or any variation thereof means the sale,
                      --------------
         assignment, lease or other disposition of a Licensed Product by
         Licensee to a non-Affiliate. A Licensed Product shall be deemed to have
         been sold for purposes of calculating royalties under Article III
         hereof upon the first to occur of the following: (i) the transfer of
         title in the Licensed Product from Licensee to a non-Affiliate; or (ii)
         shipment of the Licensed Product from the manufacturing facilities of
         Licensee to a non-Affiliate.
<PAGE>
         License Agreement between PI Research Corporation and Penn            5
         January 2, 1992

         1.19        "Technical Information" means and includes all technical
                     -----------------------
         information, trade secrets, developments, formulae, processes and other
         information developed by Dr. Harvey Rubin and/or other Principal
         Investigator that the University owns or possesses and that relates to
         the use of alpha-1 Antichymotrypsin and/or C1 Esterase Inhibitor in the
         Field, including by way of illustration and not limitation, designs,
         data, drawings, documents, models, and other similar information.
         "Technical Information" shall exclude any of the foregoing that are
         included in a claim of the Licensed Patents.

         1.20        "Valid Claim" means a claim of an unexpired Licensed Patent
                     -------------
         that has not been withdrawn, cancelled or disclaimed or held invalid by
         a court or governmental authority of competent jurisdiction in an
         unappealed or unappealable decision, or a claim of a pending patent
         application.

                               Article II: Grant of License

         2.1         Licensed Technology Grant. University grants to Licensee
                     --------------------------
         for the term of this Agreement an exclusive license, with right to
         sublicense, to make, use, have made or sell Licensed Products and
         products incorporating Technical Information throughout the world,
         subject to the terms and conditions herein.

         2.2         Exclusive but for Non-Profit Use. The license grant of this
                     ---------------------------------
         Article is exclusive but for the reserved right of the University to
         use and permit the use of by non-profit organizations, without cost and
         in confidence, the Licensed Patents, the Joint Patent Rights, and the
         Technical Information solely for educational and research purposes on a
         non-commercial basis, subject to the prior written consent of Licensee
         for each such use, such consent not to be unreasonably withheld.

         2.3         Right to Sublicense. The right to sublicense conferred upon
                     --------------------
         Licensee under this Agreement is subject to the following conditions:

             (a)  Licensee  shall  forward  to  the  University,  promptly  upon
         execution,  a complete  and accurate  written copy  of each  sublicense
         granted hereunder.

             (b) In each sublicense, the sublicensee shall be prohibited from
         further sublicensing and shall acknowledge that it is subject to the
         terms and conditions of the License granted to Licensee under this
         Agreement.

             (c) Notwithstanding any such sublicense, Licensee shall remain
         primarily liable to the University for all of the Licensee's duties and
         obligations contained in this
<PAGE>
         License Agreement between PI Research Corporation and Penn            6
         January 2, 1992

         Agreement, and any act or omission of a sublicensee which would be a
         breach of this Agreement if performed by Licensee shall be deemed to be
         a breach by Licensee of this Agreement.

             (d) If Licensee becomes subject to a Bankruptcy Event, all payments
         then or thereafter due and owing to Licensee from its sublicensees
         shall upon notice from the University to any such sublicensee become
         payable directly to the University for the account of the Licensee;
         provided however, that the University shall remit to Licensee the
         amount by which such payments exceed the amounts owed by licensee to
         the University.

         2.4          No Riqhts by Implication. No rights or licenses with
                      -------------------------
         respect to the Licensed Technology are granted or deemed granted
         hereunder or in connection herewith, other than those rights or
         licenses expressly granted in this Agreement.

         2.5          Federal Government Interest. Licensee acknowledges that in
                      ----------------------------
         accordance with the Federal Government Interest, the United States
         Government retains certain rights in inventions funded in whole or in
         part under any contract, grant or similar agreement with a Federal
         agency. The license to the Licensed Technology granted under this
         Article II is expressly subject to all such rights.

                                  Article III: Royalties

         3.1         License Fee. In consideration of the Assignment Agreement
                     ------------
         in Attachment D, Licensee has issued, on the Effective Date of this
         Agreement, common shares in the Licensee to the following parties:

             (a) To University a grant of [     ] shares subject to the terms
         and conditions described in Attachment E ("University Stock Purchase
         Agreement"), such shares constituting an [                ] fully 
         diluted interest in the Licensee at the Effective Date of this 
         Agreement;

                    (b) To Dr. Harvey Rubin an opportunity to
         purchase [            ] subject to the terms and conditions
         as described in Attachment G ("Rubin Stock Agreement) and Attachment H
         ("Rubin Consultancy Agreement"), such shares
         constituting a [                     ] fully diluted interest in
         the Licensee at the Effective Date of  this Agreement;

             (c) To Dr. Barry Cooperman, University Professor of Chemistry and
         Investigator, an opportunity to purchase
         [     ] shares subject  to the terms and conditions described in 
         Attachment I ("Cooperman Stock Agreement") and Attachment
<PAGE>
         License Agreement between PI Research Corporation and Penn           7
         January 2, 1992

         J ("Cooperman Consultancy Agreement"), such shares constituting a      
         [                    ] fully diluted interest in the Licensee as of 
         the Effective Date of this Agreement;

             (d) To Dr. Norman Schechter, University Research Professor of
         Dermatology and Investigator, an opportunity to
         purchase [      ] shares subject to the terms and conditions
         described in Attachment K ("Schechter Stock Agreement") and
         Attachment L ("Schechter Consultantancy Agreement") such
         shares constituting a [                                ] fully
         diluted  interest in  the Licensee  as  of the  Effective Date  of this
         Agreement;

             (e) To Dr. Zhai-Mei Wang, University Research Associate for
         Infectious Disease and Investigator an
         opportunity to purchase [      ] shares subject to the terms
         and conditions described in Attachment M ("Wang Stock
         Agreement") and Attachment N ("Wang Consultancy Agreement"), such
         shares constituting a [                    ] fully diluted interest 
         in the Licensee as of the Effective Date of this Agreement;

             (f) The provisions of this paragraph 3.1 are further accepted by
         the Investigators in the letter agreement appearing in Attachment O.

             (g) No additional up-front payment or fee upon execution of this
         Agreement is due to the University by Licensee.

         3.2         Royalties. In consideration of the exclusive Licensed
                     ---------
         Technology grant herein, Licensee shall pay royalties to the University
         on the following basis:

             (a) Licensee shall pay to University a royalty of [               ]
         of the Net Sales Price of each Licensed Product sold by Licensee, 
         and, subject to Section 3.11, such royalty rate shall not be subject 
         to reduction by Licensee if Licensee must acquire, for any reason, 
         patent rights from third parties in order to practice Licensed 
         Technology or sell Licensed Products.

             (b) Licensee shall be exempt from the payment of royalties for sale
         of products that incorporate Technical Information, provided such
         products do not incorporate Licensed Patents. Royalty free sales of
         such products incorporating only Technical Information shall not apply
         if Licensee, University, Principal Investigators and Investigators
         agree in writing that Technical Information disclosed by University to
         Licensee, which is otherwise patentable, shall be maintained as a trade
         secret. In such
             
<PAGE>
         License Agreement between PI Research Corporation and Penn           8
         January 2, 1992

         case a product incorporating such trade secret shall bear
         the royal described in Section 3.2 herein for the lesser
         of [              ] years following first commercial sale of
         such product(s), or for as long as such Technical Information is
         maintained as a trade secret.

             (c) Licensee shall pay to the University the lesser of 
         [            ] of all royalties, license fees, advances and other
         payments (however characterized) received by Licensee pursuant to a
         sublicense of any rights granted Licensee hereunder, or [            ]
         of such sublicensee's Net Sales for such Licensed Products sold by
         such sublicenses. Any noncash consideration received by the Licensee
         from sublicensees in lieu of a license fee or on account of sales of
         Licensed Product shall be valued at its fair market value as of the
         date of receipt. Monies paid to Licensee exclusively to fund research
         and development or clinical testing are not subject to any royalty to
         the University.

             (d) Sales of any Licensed Product shall not be subject to more than
         one assessment of the [                 ]  royalty due University, 
         regardless of the number of Licensed Patents or Joint Patents, or 
         uses of Technical Information treated as trade secret, that are 
         applicable to such Licensed Product.

          3.3       Diligence Obligations of Licensee
                    ---------------------------------

             (a) In lieu of diligence fees paid to the University, Licensee
         agrees to fund, until such time as minimum royalties are due under
         Section 3.4 hereunder, development of Licensed Technologies in annual
         amounts substantially similar to the annual budgeted amount of the
         Collaborative Research Agreement. Such development work may
         be funded at the University, in the facilities of the
         Licensee, in the facilities of a sublicensee, or in other venue
         reasonably capable of conducting such development. Licensee may
         employ its own capital, or governmental or commercial contract
         revenues in fulfillment of this obligation. Funds expended by a
         sublicensee, and appropriately documented and reported, shall also
         be applicable to this obligation of Licensee.

             (b) In order to fulfill its obligations under 3.3(a) herein through
         February 29, 1992, Licenses shall support research at the University
         under the terms of the Collaborative Research Agreement and in such
         amounts as described in the budget of the Collaborative Research
         Agreement.

         3.4          Minimum Royalties. Licensee shall pay to Licensor as a
                      -----------------
         nonrefundable advance against royalties during the ensuing year,
         minimum annual royalties on the following
<PAGE>
         License Agreement between PI Research Corporation and Penn            9
         January 2, 1992

         dates in the corresponding amounts (the "Minimum Royalties"):

                    Minimum Royalty           Fiscal Year Beginning
                    $ [        ]              July 1, 1997
                                                        --
                    $ [        ]              July 1, 1998
                                                        --
                    $ [        ]              July 1, 1999
                                                        --
                    $ [        ]              July 1 of each fiscal 
                                                   year thereafter


         Minimum royalties shall be available for full credit against Royalties
         due under Section 3.2 during the year in which such Minimum Royalties
         are paid and during subsequent years until the amount of the credit is
         fully used. In any year that a minimum royalty is due, if the Licensee
         sponsors research at the University in the Field under the Principal
         Investigator during that year, the full amount of research funding paid
         may be applied as a credit against minimum royalties due in that year
         and in subsequent years until the full amount of credit is fully used.

         3.5          Sales to Federal Government. To the extent required by the
                      ---------------------------
         Federal Government Interest,  sales by  Licensee to  the United  States
         Government shall not be subject to royalty.

         3.6         Payments. Royalties payable under Section 3.2 hereof shall
                     --------
         be paid within (30) days following the last day of the Calendar Quarter
         in which the royalties accrue. After termination of this Agreement, the
         final royalty payment shall be made in accordance with the provisions
         of Article 9.4 hereof. Payments may be deemed paid as of the day on
         which they are received at the account designated pursuant to Article
         3.8.

         3.7         Reports. Licensee shall deliver to the University within
                     -------
         thirty (30) days after the end of each Calendar Quarter a report,
         certified by the chief financial officer of Licensee, setting forth in
         reasonable detail the calculation of the royalties payable to the
         University for such Calendar Quarter, including, without limitation,
         the Licensed Product sold in each country during such Calendar Quarter,
         the Net Sales Price thereof, all compensation received from
         sublicensees, and the amount of Minimum Royalties available for credit
         for the corresponding Calendar Quarter.

         3.8        Currency, Place of Payment, Interest.
                    ------------------------------------

             (a) All dollar amounts referred to in this Agreement are expressed
         in United States dollars. All payments to the University under this
         Agreement shall be made in United States dollars (or other legal
         currency of the United States) by check payable to "The Trustees of the
         University of Pennsylvania."
<PAGE>
         License Agreement between PI Research  Corporation and Penn          10
         January  2, 1992

             (b) If Licensee receives revenues from sales of Licensed Products
         in a currency other than United States dollars, royalties shall be
         converted into United States dollars at the conversion rate for the
         foreign currency as published in the Eastern edition of The Wall Street
                                                                 ---------------
         Journal as of the last date of the Calendar Quarter. If at any time
         --------
         legal restrictions prevent the prompt remittance of part or all
         royalties by Licensee or any sublicensee with respect to any country
         where a Licensed Product is sold, Licensee or such sublicensee shall
         have the right and option to make such payments by depositing the
         amount thereof in local currency to the University's account in a bank
         or other depository in such country; provided, however, that if such
         legal restrictions are not removed within one (1) year after the date
         such account is established, Licensee shall then remit promptly to the
         University an amount in United States dollars equal to the deferred
         royalties held in such account. Upon receipt of these deferred
         royalties by the University, Licensee shall be entitled to transfer to
         its own account all corresponding amounts held on behalf of the
         University in the local bank or depository.

             (c) Amounts that are not paid when due shall accrue interest from
         the due date until paid, at a rate equal to then prevailing prime rate
         of interest plus [                   ].  The University may treat 
         unpaid payments as a breach of this  Agreement notwithstanding the 
         payment of interest.

         3.9         Records. Licensee will maintain and cause its sublicensees
                     -------
         to maintain, complete and accurate books and record which enable the
         royalties payable hereunder to be verified. The records for each
         Calendar Quarter shall be maintained for five years after the
         submission of each report under Section 3.7 hereof. Upon reasonable
         prior notice to Licensee, the University and its accountants shall
         have access to the books and records of Licensee and its sublicensees
         to conduct a review or audit thereof. Such access shall be available
         not more than once each calendar year, during normal business hours,
         and for three years after the expiration or termination of this
         Agreement. If the University determines that Licensee has underpaid
         royalties by 10% or more, Licensee will pay the costs and expenses of
         the University's accountant in connection with its review or audit.

         3.10        Duration of Royalty Obligations. Except as described in
                     -------------------------------
         Section 3.2(b) herein, Licensee's royalty obligations for a Licensed
         Product shall terminate on a [


                                                                              ]
<PAGE>
         Licenee Agreement between PI Research Corporation and Penn           11
         January 2, 1992

         [
                                                                    ]
         
         3.11        Mandatory Licensing.       In the event that Licensee is
                     -------------------
         required by judgment, final order, or agreement with a third party to
         settle litigation, to acquire one or mere royalty-bearing licenses from
         a third party in order to fully exercise in a given country the rights
         granted by the University hereunder, then Licensee shall be entitled to
         credit an amount equal to [                  ] of the royalties 
         actually paid to such a third party against royalties  payable to the
         University  under  Section 3.2  hereof for Licensed Products  sold in 
         that country, provided however that for any calendar quarter such 
         credits do not exceed [                       ] of the royalties 
         payable to the University in such calendar quarter.

         3.12        Cumulative Credits. Under no circumstances shall Licensee
                     ------------------
         be entitled to receive credits against royalties payable to the
         University under Section 3.2 hereof that, for any Calendar Quarter,
         exceed in the aggregate [                          ]  of the 
         royalties payable to the University under that section in such 
         calendar quarter. This provision does not apply to credits under 
         Sections 3.4 and 7.2(e but otherwise applies to any credit Licensee 
         may receive without limitation, under Sections 3.11, 6.3 or 7.1(d) 
         hereof.

         3.13       Unlicensed Sales by Third Parties. In the event that the
                    ---------------------------------
         total sales of any Licensed Product in any country by unlicensed third
         parties, based on bona fide information reporting such revenue by an
         unlicensed third party, equals or exceeds [                     ] of 
         the total revenue of          Licensee, its Affiliates and its 
         sublicensees for sale of such Licensed Product in said country, 
         then the royalty rate provided in Section 3.2 hereof for such 
         Licensed Product in such country shall be reduced to [             ]
         such royalty rate for Calendar Quarters so affected. This provision
         shall have no effect if Licensee fails to use reasonable efforts to
         terminate such unlicensed sales.

                     Article IV: Certain Obligations of the Licensee

          4.1       Licensee Efforts; Reporting.
                    ---------------------------
                    (a) Licensee shall use its best efforts to develop
         for commercial use and to market Licensed Products as soon as
         practicable, consistent with sound and reasonable business practices.
         In this connection, the parties acknowledge that the Licensed
         Technology has only recently been invented and that substantial
         additional effort, expense and time, as well as regulatory approval,
         will be required before manufacture and sales of any Licensed Product
         will be possible.
<PAGE>
         License Agreement between PI Research Corporation and Penn          12
         January 2, 1992

             (b) Licensee shall provide the University on each June 1 and
         December 1 with written reports, setting forth in such detail as the
         University may reasonably request, the progress of the development,
         evaluation, testing and commercialization of the Licensed Products.
         Licensee also shall notify the University within thirty (30) days after
         the first commercial sale of a Licensed Product.

         4.2        Compliance with Laws.
                    --------------------
                    (a) Licensee shall comply with all prevailing
         laws, rules and regulations pertaining to the development, testing,
         manufacture, marketing and import or export of the Licensed Products.
         Without limiting the foregoing, Licensee acknowledges that the transfer
         of certain commodities and technical data is subject to United States
         laws controlling the export of such commodities and technical data,
         including all Export Administration Regulations of the United States
         Department of Commerce. These laws and regulations, among other things,
         prohibit or require a license for the export of certain types of data
         to specified countries. Licensee will comply with all United States
         laws and regulations controlling the export of commodities and
         technical data, and will be solely responsible for any violation
         thereof by License~e of its sublicensees.

             (b) To the extent required by the Federal Government Interest, all
         Licensed Products to be used or sold in the United States shall be
         manufactured substantially in the United States, and Licensee shall
         take such actions necessary to assure that it and its sublicensees
         comply with the obligations imposed by this Section 4.2(b).

         4.3         Government Approvals. Licensee will be responsible for
                     --------------------
         obtaining at its cost and expense, all governmental approval required
         to commercially market the Licensed Products.

         4.4         Patent Notices, etc. Licensee shall mark the Licensed
                     -------------------
         Products sold in the United States with all applicable patent numbers.
         All Licensed Products shipped to and sold/or sold in other countries
         shall be marked and labeled in such a manner as to conform with all
         applicable laws of the country where the Licensed Products are sold.

         4.5         Security Interest. In consideration of the license and
                     -----------------
         other rights granted in this Agreement, Licensee hereby grants to the
         University a security interest in any interest Licensee may have in the
         Licensed Technology to secure performance of Licensee's obligations
         under this Agreement. Upon default by Licensee or if Licensee becomes
         subject to a Bankruptcy Event, the University shall have all the rights
         and remedies of a secured party under the Uniform Commercial Code.
         Licensee shall execute any such instruments
<PAGE>
         License Agreement between PI Research Corporation and Penn          13
         January 2, 1992

         or documents as shall be required to evidence and perfect such security
         interest in any jurisdiction.

                        Article V: Warranties and Representations

         5.1          Representations and Warranties of the University. The
                      ------------------------------------------------
         University represents and warrants to the Licensee that: (a) this
         Agreement, when executed and delivered by the University, will be the
         legal, valid and binding obligation of the University, enforceable
         against the University in accordance with its terms; (b) the University
         has not granted rights in or to the Licensed Technology to any person
         other than the Licensee, except to the extent provided by Federal
         Government Interest; (c) the University does not have any knowledge
         that the Licensed Technology infringes the proprietary rights of any
         third party; and (d) the University does not have any knowledge of any
         patent or other proprietary technology of the University other than the
         Licensed Patents and the Technical Information which would be required
         to make, have made, use and sell the Licensed Products and to practice
         under the Licensed Technology in connection therewith. However, the
         University gives no representation or warranty that any patent within
         the Licensed Patents will be granted or, if granted, that any such
         patent will be valid. The representations and warranties in clauses
         (b), (c), and (d) hereof are to the knowledge of the University, based
         upon conversations with certain officials of the University. The
         University has made no independent investigation, examination or review
         of the matters which are subject to the foregoing representations.

         5.2             Representations and Warranties of Licensee.  
                         ------------------------------------------
         Licensee represents and warrants to the University as follows:

             (a) Licensee is a corporation duly organized, validly existing and
         in good standing under the laws of Delaware, and has all requisite
         corporate power and authority to execute, deliver and perform this
         Agreement;

             (b) this Agreement, when executed and delivered by Licensee, will
         be the legal, valid and binding obligation of Licensee, enforceable
         against Licensee in accordance with its terms; and,

             (c) the execution, delivery and performance of this Agreement by
         Licensee does not conflict with, or constitute a breach or default
         under, (i) the charter documents of Licensee, (ii) any law, order,
         judgment or governmental rule or regulation applicable to Licensee, or
         (iii) any provision of any material agreement, contract, commitment or
         instrument to which Licensee is a party; and the execution, delivery
         and performance of this Agreement by Licensee does not require the
         consent, approval or
<PAGE>
         License Agreement between PI Research Corporation and Penn         14
         January 2, 1992

         authorization of, or notice, declaration, filing or registration with,
         any governmental or regulatory authority.

                  Article VI:Limitation on Liability and Indemnification

         6.1          No Warranties; Limitation on Liability. EXCEPT AS
                      --------------------------------------
         EXPLICITLY SET FORTH IN SECTION 5.1 HEREOF, THE LICENSED TECHNOLOGY IS
         PROVIDED ON AN "AS IS" BASIS AND THE UNIVERSITY MAKES NO
         REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO THE
         LICENSED TECHNOLOGY OR THE LICENSED PRODUCTS. BY WAY OF EXAMPLE BUT NOT
         OF LIMITATION, THE UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES
         (i) OF COMMERCIAL UTILITY, (ii) OF MERCHANTABILITY OR FITNESS FOR A
         PARTICULAR PURPOSE, OR (iii) THAT THE USE OF THE LICENSED TECHNOLOGY
         WILL NOT INFRINGE ANY PATENT, COPYRIGHT OR TRADEMARK OR OTHER
         PROPRIETARY RIGHT OR PROPERTY RIGHTS OF OTHERS. THE UNIVERSITY SHALL
         NOT BE LIABLE TO LICENSEE, LICENSEE'S SUCCESSORS OR ASSIGNS OR ANY
         THIRD PARTY WITH RESPECT TO ANY CLAIM ON ACCOUNT OF, OR ARISING FROM,
         THE USE OF INFORMATION IN CONNECTION WITH THE LICENSED TECHNOLOGY
         SUPPLIED HEREUNDER OR THE MANUFACTURE, USE OR SALE OF LICENSED PRODUCTS
         OR ANY OTHER MATERIAL DERIVED THEREFROM. THE UNIVERSITY SHALL NOT BE
         LIABLE TO LICENSEE OR ANY OTHER PERSON FOR ANY LOSS OF PROFITS, LOSS OF
         BUSINESS OR INTERRUPTION OF BUSINESS, OR FROM ANY INDIRECT, SPECIAL OR
         CONSEQUENTIAL DAMAGES OF ANY KIND INCURRED BY LICENSEE OR ANY OTHER
         PERSON WHETHER UNDER THIS AGREEMENT OR OTHERWISE, EVEN IF THE
         UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSS.

         6.2         Licensee Indemnification. Licensee will defend, indemnify
                     ------------------------
         and hold harmless the University, its trustees, officers, faculty,
         agents and employees, and students (collectively, the "Indemnified
         Parties") from and against any and all liability, loss, damage, action,
         claim or expense suffered or incurred by the Indemnified Parties
         (including reasonable attorney's fees) (individually, a "Liability"
         and collectively, the "Liabilities") which results from or arises out
         of (a) the development, use, manufacture, promotion, sale, or other
         disposition of the Licensed Technology and any Licensed Products, or
         information, results or inventions arising from the Collaborative
         Research Agreement by Licensee, its Affiliates, assignees, 
         sublicenses, vendors or other third parties; (b) breach by Licensee 
         of any covenant or agreement contained in this Agreement or the 
         Collaborative Research Agreement; (c) Licensee's use of the Research 
         Inventions or any results of the Collaborative Research conducted 
         under the Collaborative Research Agreement and (d) the successful 
         enforcement by an Indemnified Party of its rights under this Section 
         6.2. Without limiting the foregoing, Licensee will indemnify and hold 
         harmless the Indemnified Parties from and against any Liabilities 
         resulting from:
<PAGE>
         License Agreement between PI Research Corporation and Penn           15
         January 2, 1992

             (i) any product liability or other claim of any kind related to the
         use by a third party of a Licensed Product that was manufactured, sold
         or otherwise disposed of by Licensee, its Affiliates, assignees,
         sublicensees, vendors or other third parties;

             (ii) a claim by a third party that the Licensed Technology or the
         design, composition, manufacture, use, sale or other disposition of any
         Licensed Product infringes or violates any patent, copyright, trademark
         or other intellectual property rights of such third party; and

             (iii) clinical trials or studies conducted by or on behalf of
         Licensee relating to the Licensed Products, including, without
         limitation, any claim by or on behalf of a human subject of any such
         clinical trial or study, any claim arising from the procedures
         specified in any protocol used in any such clinical trial or study, any
         claim or deviation, authorized or unauthorized, from the protocols of
         any such clinical trial or study, and any claim resulting from or
         arising out of the manufacture or quality control by a third party of
         any substance administered in any clinical trial or study.

         6.3          Procedures. The Indemnified Party shall promptly notify
                      ----------
         Licensee of any claim or action giving rise to a Liability subject to
         the provisions of Section 6.2. Licensee shall have the right to defend
         any such claim or action, at its cost and expense. Licensee shall not
         settle or compromise any such claim or action in a manner that imposes
         any restrictions or obligations on the University or grants any rights
         to the Licensed Technology, without the University's written consent
         which consent shall not be unreasonably withheld. If Licensee fails or
         declines to assume the defense of any such claim or action within
         thirty (30) days after notice thereof, the University may assume the
         defense of such claim or action for the account and at the risk of the
         Licensee. Licensee shall pay promptly to the Indemnified Party any
         Liabilities to which the foregoing indemnity relates, as incurred. The
         indemnification rights of the University or other Indemnified Party
         contained herein are in addition to all other rights which such
         Indemnified Party may have at law or in equity or otherwise.
         Notwithstanding the foregoing, in the event of settlement, judgment or
         other final resolution of a claim by a third party under Section 6.2
         (ii) hereof requiring Licensee to pay royalties to such third party for
         Licensed Products sold in a given country, Licensee shall have the
         right to credit the full amount of such payment against the royalties
         payable to the University under Section 3.2 for sales of Licensed
         Products in such country, provided however, that for any calendar
         quarter such credits do not exceed fifty percent (50%) of the royalties
         payable to the University in
<PAGE>
         License Agreement between PI Research Corporation and Penn           16
         January 2, 1992

         such Calendar Quarter. Unused credits may be applied in subsequent
         quarters until the credit is fully used.

         6.4          Product Liability Insurance. Beginning with the
                      ---------------------------
         commencement of human clinical trials and, for ten (10) years after
         Licensee ceases manufacturing and marketing the Licensed Products,
         Licensee shall maintain general and product liability insurance in
         amounts not less than $2,000,000 per incident and $2,000,000 in the
         aggregate, issued by an insurance company rated A or better and naming
         the University as an additional insured. The minimum insurance amounts
         specified herein shall not be deemed a limitation on Licensee's
         indemnification liability under this Agreement. Licensee shall provide
         the University with copies of the endorsements to such policies, upon
         request of the University. Licensee shall notify the University at
         least thirty (30) days prior to cancellation of any such coverage. The
         University shall receive a royalty on any insurance award constituting
         compensation to Licensee for lost profits on the sale of Licensed
         Products.

                          Article VII: Patents and Infringement

         7.1        Prosecution of Patents.
                    ----------------------
                    (a) The University shall be responsible for and
         shall control the preparation, prosecution and maintenance, both
         domestic and foreign, of the Licensed Patents and any other rights
         included in the Licensed Technology. Licensee shall have the right, at
         its own expense, to review and comment upon all patent filings, office
         actions and related submissions within such time limits as University
         shall reasonably impose in any given instance. Licensee shall reimburse
         the University for all documented expenses (including legal fees,
         filing and maintenance fees or other governmental charges) incurred
         subsequent to the Effective Date of this Agreement in connection with
         the filing, prosecution and maintenance of the Licensed Patents or
         other Licensed Technology.

             (b) Licensee and the University shall mutually determine the
         countries, both domestic and foreign, where the Licensed Patents will
         be prosecuted and maintained. If Licensee declines to pay for patent
         preparation and filing, prosecution and maintenance costs in any
         jurisdiction, the University may do so at its cost and expense but such
         patents shall be excluded from the definition of Licensed Patents.

             (c) If the University elects not to file, prosecute or maintain any
         patent or patent application included in the Licensed Patents, it shall
         notify Licensee at least sixty (60) days prior to taking, or not
         taking, any action which would result in abandonment, withdrawal, or
         lapse of such patent or patent application. Licensee shall
<PAGE>
         License Agreement between PI Research Corporation and Penn           17
         January 2, 1992

         then have the right to file, prosecute or maintain the patent or patent
         application.

             (d) Licensee may credit against running royalty payments due under
         Section 3.2 herein one hundred percent (100%) of any amount reimbursed
         to University or paid directly by Licensee for the filing, prosecution
         or maintenance of Licensed Patents in the United States or other
         foreign jurisdictions. Such credits are subject to the limitations of
         Section 3.12, but Licensee may apply unused credits from quarter to
         quarter until such credits are used.

             (e) Each party shall cooperate with the other party to execute all
         lawful papers and instruments and to make all rightful oaths and
         declarations as may be necessary in the preparation and prosecution of
         all such patents and other applications and protections referred to in
         this Section 7.1.

         7.2         Ownership. The University shall retain all right, title and
                     ---------
         interest in and to the Licensed Patents or other Licensed Technology.
         Licensee shall have the right, but not the obligation, to enforce the
         Licensed Patents and to prosecute any infringement of the Licensed
         Patents at its own expense. In such an event, the University shall
         cooperate with Licensee, at Licensee's expense. Licensee shall not
         settle or compromise any such suit in a manner that imposes any
         obligations or restrictions on the University or grants any rights to
         the Licensed Technology, without the University's written consent which
         consent shall not be unreasonably withheld.

             (b) If Licensee fails to prosecute such infringement within ninety
         (90) days after receiving notice thereof, the University shall have the
         right, but not the
                                                                -
         obligation, to prosecute such infringement at its own expense. In such
         event, Licensee shall cooperate with the University, at the
         University's expense.

             (c) Any recovery obtained by the prosecuting party as a result of
         such proceeding, by settlement or otherwise, shall be applied first to
         reimburse the expenses of the litigation, dollar for dollar, incurred
         by each of the Licensee or the University, if the University has
         incurred such expenses as prosecuting party or has been subject to
         royalty credits under 7.2(e) herein. Three-fourths of any remaining
         funds shall be paid to the prosecuting party, and one-fourth to the
         other party, be it the Licensee or the University as the case may be.

             (d) In the event that a claim or suit is asserted or brought
         against Licensee that the manufacture or sale of the Licensed Product
         by Licensee or its Affiliates,
<PAGE>
         License Agreement between PI Research Corporation and Penn         18
         January 2, 1992

         subsidiaries, or sublicensees, or the use of the Licensed Product by
         any customer of the foregoing entities infringes a patent or patents of
         a third party, Licensee shall give written notice of such claim or suit
         to the University. Licensee may in its sole discretion decide to change
         or modify the Licensed Product to avoid such infringement or, if no
         such change is made, to settle on terms that Licensee deems in its sole
         discretion right and proper, subject to subsection (g) below.
         Otherwise, Licensee shall have the right, but not the obligation, to
         defend any such claims or suit for infringement brought against it by
         the third party and if required by law or if requested by University,
         to join University as a party defendant. In the event Licensee elects
         not to defend such claim or suit, the University shall have the option
         to defend such claim or suit.

             (e) In the event Licensee (i) initiates an action to enforce
         Licensed Patents or (ii) defends a suit for infringement, Licensee may
         credit against royalties due under this Agreement an amount equal to up
         to fifty percent(50%) of expenses incurred but not recovered in
         bringing such action or defending such suit. Licensee will make an
         accounting of all such expenses as part of its reporting obligations
         under Article 3. The limitations on the use of royalty credits as
         described in Paragraph 3.12 shall not apply to credits granted under
         7.2(e) herein. Unused credits in any given Calendar Quarter may be
         carried into subsequent quarters until all credits are used.

             (f) Licensee shall have the sole right in accordance with the terms
         and conditions herein to sublicense any alleged infringer of the
         Licensed Patents to prevent future infringements. Amounts received from
         any such sublicensee constituting retroactive royalties shall be
         considered amounts received in settlement and accounted for under
         Section 7.2(c) above. Otherwise, amounts received from such sublicensee
         shall be treated as sublicense revenues under Section 3.2(c) above.

             (g) Licensee shall not compromise or settle any claim or action in
         any manner that would affect the rights of the University without the
         consent of the University. The University shall not compromise or
         settle any claim or action in any manner that would affect the right of
         the Licensee without the consent of Licensee.

             (h) Nothing contained in this Section 7.2 shall be deemed to limit
         in any way Licensee's indemnification obligations under Sections 6.2
         and 6.3 of this Agreement.

         7.3          Certain Notices. Licensee shall notify the University at
                      ---------------
         least sixty (60) days before the Licensee uses or exports the Licensed
         Technology or any Licensed Product in or to any country outside of the
         United States, to allow
<PAGE>
         License Agreement between PI Research Corporation and Penn           19
         January 2, 1992

         the University to make any patent filings or to take other actions
         necessary to protect the Licensed Technology.


                       Article VIII: Confidentiality

          Confidentiality.
          ---------------

                      (a) During the term of this Agreement and for a
         period of              thereafter, Licensee and its
         sublicensees shall maintain in confidence and shall not disclose to
         any third party the Confidential Information received pursuant to the
         Agreement, without the prior written consent of the University. The
         foregoing obligation shall not apply to:

             (i) information that is known to Licensee or independently
         developed by Licensee prior to the time of disclosure, in each case, to
         the extent evidenced by written records promptly disclosed to the
         University upon receipt of the Confidential Information;

             (ii) information disclosed to Licensee by a third party that has a
         right to make such disclosure;

             (iii) information that becomes patented, published or otherwise
         part of the public domain as a result of acts by the University or a
         third person obtaining such information as a matter of right; or

             (iv) information that is required to be disclosed by order of the
         U.S. Food and Drug Administration or similar authority or a court of
         competent jurisdiction; provided that the parties shall use their best
         efforts to obtain confidential treatment of such information by the
         agency or court.

             (b) Licensee will take all reasonable steps to protect the
         Confidential Information of the University with the same degree of care
         Licensee uses to protect its own confidential or proprietary
         information. Without limiting the foregoing, Licensee shall ensure that
         all of its employees having access to the Confidential Information of
         the University are obligated to abide by Licensee's obligations
         hereunder.

             (c) The University shall not be obligated to accept any
         Confidential Information of the Licensee. If Licensee desires to
         furnish any such Confidential Information to any University personnel,
         Licensee may request such individual to sign a confidentiality
         agreement with Licensee in the form of Attachment 3 to Attachment F
         hereto. The University bears no institutional responsibility
<PAGE>
         License Agreement between PI Research Corporation and Penn          20
         January 2, 1992

         for maintaining the confidentiality of any Confidential Information of
         Licensee.

         8.2        Publication.
                    -----------
                    (a) Licensee acknowledges that the basic
         objective of research and development activities of the University is
         the generation of new knowledge and its expeditious dissemination. To
         further that objective, the University retains the right, at its
         discretion, to demonstrate, publish or publicize a description of the
         Licensed Technology and any results of research conducted by the
         University with the Licensed Technology, subject to the provisions of
         clauses (b) and (c) below.

             (b) Should the University desire to disclose publicly, in writing
         or by oral presentation, Confidential Information related to the
         Licensed Technology for which a patent application has not been filed,
         the University shall notify Licensee in writing of its intention at
         least thirty (30) days before submission of such material that would
         make such disclosure. The University shall include with such notice a
         description of the oral presentation or, in the case of a manuscript or
         other proposed written disclosure, a current draft of such written
         disclosure. Licensee may request the University, no later than thirty
         (30) days following the receipt of the University's notice, to file a
         patent application, copyright or other appropriate form of intellectual
         property protection related to the information to be disclosed. All
         such filings shall be subject to the provisions of Section 7.1 of this
         Agreement. Upon receipt of such request, the University shall arrange
         for a short delay in publication, not to exceed sixty (60) days, to
         permit filing of a patent or other application by the University, or if
         the University declines to file such application, to permit Licensee to
         make such a filing. If University receives no such request from
         Licensee to delay submission of material making such disclosure,
         University may submit such material for publication or presentation
         provided that University first confirms in a reasonable way that
         Licensee has received and reviewed such materials.

             (c) If the University desires to demonstrate, publish or publicize
         Confidential Information related to the Licensed Technology that is not
         patentable in the United States, and Licensee objects to such proposed
         disclosure within the time period specified in clause (b) above, the
         parties will negotiate in good faith to determine whether the proposed
         disclosure can be modified or withheld, consistent with the objectives
         of each party. In no event shall the University be prohibited from
         proceeding with any such publication.

             Use of Name. Nothing contained in this Agreement shall be construed
             -----------
         as conferring any right to use any name,
<PAGE>
         License Agreement between PI Research Corporation and Penn           21
           ~
         January 2, 1992

         trade name, trademark, or other designation of either party hereto
         (including any contraction, abbreviation or simulation of any of the
         foregoing), or the name of any trustee, director, officer or employee
         thereof, without the express prior written approval of the affected
         party, except where, upon advice of counsel, such use is required to
         comply with any law or regulation of a governing body having
         jurisdiction over a party or over the making, using or selling of a
         Licensed Product. Each party hereto further agrees not to use or refer
         to this Agreement or any license granted hereunder in any promotional
         activity associated with Licensed Products, without the express prior
         written approval of the other party.

                             Article IX: Term and Termination

         9.1         Term. This Agreement and the license granted herein shall
                     ----
         commence on the date first set forth above and shall continue, subject
         to earlier termination under Sections 9.2 or 9.3 hereof,

         9.2        Termination by the University.
                    -----------------------------
                    (a) Upon the occurrence of any of the events set
         forth below ("Events of Default"), the University shall have the right
         to terminate this Agreement by giving written notice of termination,
         such termination effective as described in each event:

                        (i) nonpayment of any amount payable to the
         University that is continuing              calendar days
         after the University gives licensee written notice of such
         nonpayment;

             (ii) breach by Licensee of any covenant (other than a payment
         breach referred to in clause (i) above) or any representation or
         warranty contained in this Agreement that is continuing calendar days
         after the University gives Licensee written notice of such breach;
         notwithstanding the foregoing, if Licensee violates the laws,
         regulations or other legal authority in any jurisdiction relating to
         the development, use, storage, or marketing of the Licensed Products in
         a way that the University deems in its reasonable judgment to
         constitute a public safety or health hazard, the University may
         immediately terminate the license hereunder in the applicable
         jurisdiction, but the remainder of the Agreement shall continue in all
         other jurisdictions.

             (iii) Licensee fails to comply with the terms of the license
         granted under Section 2.1 hereof and such noncompliance is continuing
         calendar days
<PAGE>
         License Agreement between PI Research Corporation and Penn          22
         January 2, 1992

         after the University gives Licensee notice of such noncompliance;

             (iv) Licensee becomes subject to a Bankruptcy Event;

             (v) the dissolution or cessation of operations by Licensee.

             (b) No exercise by the University of any right of termination shall
         constitute a waiver of any right of the University for recovery of any
         monies then due to it hereunder or any other right or remedy the
         University may have at law or under this Agreement.

         9.3         Termination by Licensee. Licensee shall have the right to
                     -----------------------
         terminate this Agreement, at any time and with or
         without cause, written notice to the University.

         9.4         Rights and Duties Upon Termination. Within thirty (30) days
                     ----------------------------------
         after termination of this Agreement, each party shall return to the
         other party any Confidential Information of the other party. Licensee
         shall provide the University with a written inventory of all Licensed
         Products in process of manufacture or in stock, and Licensee (and its
         Affiliates and sublicensees) shall have the privilege of disposing of
         such Licensed Products in process of manufacture or in stock at the
         time notice of termination is served, provided, however, that Licensee
         shall pay royalties on any Net Sales of such Licensed Products at the
         rate and at the time herein provided and shall render reports thereon
         in the manner herein provided.

         9.5         Sublicenses. Any sublicense granted by Licensee under
                     -----------
         Sections 2.1 and 2.3 of this Agreement may survive termination in
         accordance with the terms of such sublicense, provided however, that
         such sublicensee becomes the direct licensee of the University.

         9.6         Provisions Surviving Termination. Licensee's obligation to
                     --------------------------------
         pay any royalties accrued but unpaid prior to termination of this
         Agreement shall survive such termination. In addition, Sections 2.5,
         3.8, 3.9, 7.1, 7.2, 8.1. 8.3, 9.4, 9.5, 9.6, 9.7, 10.1, 10.5 and
         Articles 5 and 6 and any other provisions required to interpret the
         rights and obligations of the parties arising prior to the termination
         date shall survive expiration or termination of this Agreement.

         9.7         Notification and Authorization under Drug Price Competition
                     -----------------------------------------------------------
         and Patent Term Restoration.
         ---------------------------
             (a) The University shall notify Licensee of (i) the issuance of 
         each U.S. patent included within the
<PAGE>
         License Agreement between PI Research Corporation and Penn           23
         ~a January 2, 1992

         Licensed Patents, giving the date of issue and patent number for each
         such patent, and (ii) each notice pertaining to any patent included
         within the Licensed Patents which it receives as patent owner pursuant
         to the Drug Price Competition and Patent Term Restoration Act (the
         "Act"), including but not necessarily limited to notices pursuant to
         section 101 and 103 of the Act from persons who have filed an
         abbreviated NDA or a "paper" NDA. Such notices shall be given promptly,
         but in any event within ten (10) days of each such patent's date of
         issue or receipt of each such notice pursuant to the Act, whichever is
         applicable.

             (b) The University hereby authorizes Licensee to include in any NDA
         for a Licensed Product, as Licensee may deem appropriate under the Act,
         a list of patents included within the Licensed Patents identifying the
         University as patent owner that relate to such Licensed Product and
         such other information as is required to be filed pursuant to the Act.
         The University agrees as patent owner under the Act to apply for an
         extension of the term of any patent included within the Licensed
         Patents, as patent owner under the Act, upon request by and at the
         expense of Licensee. The University also agrees to execute such
         documents and take such additional action as the U.S. Patent and
         Trademark Office or U.S. Food and Drug Administration may require in
         connection therewith; provided however, that the University's costs in
         connection with this Section 9.7 are reimbursed by Licensee.

                             Article X: Additional Provisions

          10.1      Arbitration.
                    -----------
                    (a) All disputes arising between the University
         and Licensee under this Agreement shall be settled by arbitration
         conducted in the English language in accordance with the Commercial
         Arbitration Rules of the American Arbitration Association relating to
         voluntary arbitrations with a panel of three arbitrators. The parties
         will cooperate with each other in causing the arbitration to be held in
         as efficient and expeditious a manner as practicable. Any arbitration
         proceeding instituted by either party under this Agreement shall be
         brought in Philadelphia, Pennsylvania.

             (b) Any award rendered by the arbitrators shall be final and
         binding upon the parties hereto. Judgment upon the award may be entered
         in any court of record of competent jurisdiction. Each party shall pay
         its own expenses of arbitration and the expenses of the arbitrators
         shall be equal shared unless the arbitrators assess as part of their
         award all or any part of the arbitration expenses of one party
         (including reasonable attorneys' fees) against the other party.
<PAGE>
         License Agreement between PI Research Corporation and Penn          24
         January 2, 1992

         10.2        Assignment. No rights hereunder may be assigned by the
                     ----------
         Licensee directly, unless by merger or acquisition of Licensee, without
         the express written consent of the University; provided, however, that
         Licensee may assign the same to an Affiliate that assumes all
         obligations of Licensee under this Agreement or to any entity in 
         connection with any merger, acquisition or sale of all or 
         substantially all of its business relating to the Licensed 
         Products. Any prohibited assignment of this Agreement or rights 
         hereunder shall be null and void. No assignment shall relieve 
         Licensee of-responsibility for the performance of any accrued 
         obligations which it has prior to such assignment less the 
         University consents in writing to the release of such accrued 
         obligations. This agreement shall inure to the benefit of 
         permitted assigns of Licensee.

         10.3        No Waiver. A waiver by either party of a breach or
                     ---------
         violation of any provision of this Agreement will not constitute or be
         construed as a waiver of any subsequent breach or violation of that
         provision or as a waiver of any breach or violation of any other
         provision of this Agreement.

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

         10.5        Notices. Any notice under this Agreement shall be
                     -------
         sufficiently given if sent in writing by prepaid, first class,
         certified or registered mail, return receipt requested, addressed as
         follows:

         if to the University, to:
                        University of Pennsylvania Center for Technology
                        Transfer 133 South 36th Street, Suite 419 
                        Philadelphia, PA 19104
                        Attn: Director
         with copy to:
                        Office of the General Counsel University of Pennsylvania
                        110 College Hall 
                        Philadelphia, PA 19104
                        Attn: General Counsel
<PAGE>
         License Agreement between PI Research Corporation and Penn          25
         January 2, 1992

         if to Licensee, to:

                        PI Research Corporation c/o Mr. Robert Kunze
                              Hambrecht & Quist Life Science
                            Venture Partners One Bush Street
                        San Francisco, CA 94104
                             Attn: Chief Executive Officer

         with copy to:
                              Hambrecht & Quist Life Science
                            Venture Partners One Bush Street
                        San Francisco, CA 94104
                                  Attn: Mr. Robert Kunze

         with copy to:
                        Cooley Godward Castro Huddleson & Tatum One Maritime
                        Plaza, 20th Floor San Francisco, CA 94111
                             Attn: Kenneth L.Guernsey, Esq.

         or to such other addresses as may be designated from time to time by
         Notice given in accordance with the terms of this Section.

         10.6        Entire Agreement. This Agreement embodies the entire
                     ----------------
         understanding between the parties relating to the subject matter hereof
         and supersedes all prior understandings and agreements, whether written
         or oral. This Agreement may not be varied except by a written document
         signed by duly authorized representatives of both parties.

         10.7        Severability. Any of the provisions of this
                     ------------
         Agreement which are determined to be invalid or unenforceable in any
         jurisdiction shall be ineffective to the extent of such invalidity or
         unenforceability in such jurisdiction, without rendering invalid or
         unenforceable the remaining provisions hereof or affecting the validity
         or unenforceability of any of the terms of this Agreement in any other
         jurisdiction.

         10.8        Headings. Any headings and captions used in this Agreement
                     --------
         are for convenience or reference only and shall not affect its
         construction or interpretation.

         10.9        No Third Party Benefits. Nothing in this Agreement, express
                     -----------------------
         or implied, is intended to confer on any person other than the parties
         hereto or their permitted assigns, any benefits, rights or remedies.
<PAGE>
         License Agreement between PI Research Corporation and Penn          26
         January 2, 1992

         10.10             Governing Law. This Agreement shall be construed,
                           -------------
         governed, interpreted and applied in accordance with the laws of the
         State of Delaware, without giving effect to conflict of law provisions.

         10.11             Counterparts. This Agreement shall become binding
                           ------------
         when any one or more counterparts hereof, individually or taken
         together, shall bear the signatures of each of the parties hereto. This
         Agreement may be executed in any number of counterparts, each of which
         shall be deemed as original as against the party whose signature
         appears thereon, but all of which taken together shall constitute but
         one and the same instrument.

             IN  WITNESS WHEREOF,  the parties  hereto  have duly  executed this
         License Agreement as of the date first above written.


         For The Trustees of the        For PI Research Corporation
         University of Pennsylvania     


         /s/ Stephen M. Sammut          /s/ Robert Kunze
         ---------------------------    ---------------------------
         Stephen M.Sammut               Robert Kunze
         Director, Center for           Chairman
              Technology Transfer


         Agreed to and Acknowledged:


         /s/ Harvey Rubin               /s/ Barry Cooperman
         -------------------------      -----------------------
         Dr. Harvey Rubin               Dr. Barry Coopenman
         Principal Investigator         Investigator 


         /s/ Norman Schechter           /s/ Zhai-Mei Wang
         -------------------------      ------------------------
         Dr. Norman Schechter           ~Dr. Zhai-Mei Wang
         Investigator                   Investigator
<PAGE>
         Attachment  A:  Protatek  Cooperative  Research  Agreement  
                         of  10/1/87 ("Protatek CRA")
<PAGE>
                      Cooperative Research
                      Agreement Between
                      University of Pennsylvania
                      and Protatek International
<PAGE>
Table of Contents

Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . 1
     1.1   Field of the Agreement   . . . . . . . . . . . . . . . . . . . 1
     1.2   Sponsored Research   . . . . . . . . . . . . . . . . . . . . . 1
     1.3   The General Research   . . . . . . . . . . . . . . . . . . . . 1
     1.4   Specific Research  . . . . . . . . . . . . . . . . . . . . . . 1
     1.5   Proprietary Information  . . . . . . . . . . . . . . . . . . . 1
     1.6   Confidential Information   . . . . . . . . . . . . . . . . . . 1
     1.7   Invention  . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.8   Patent Expenses  . . . . . . . . . . . . . . . . . . . . . . . 2
     1.9   Principal Investigators  . . . . . . . . . . . . . . . . . . . 2

Article 2. Sponsored Research . . . . . . . . . . . . . . . . . . . . . . 2
     2.1   Sponsored Research will consist of both the General
           Research protocol and Specific Research projects . . . . . . . 2

Article 3. Payment  . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     3.1   Protatek agrees to pay to PENN   . . . . . . . . . . . . . . . 2
     3.2   PENN is under no obligation to fund  . . . . . . . . . . . . . 2
     3.3   When three or more Research Projects   . . . . . . . . . . . . 2

Article 4. Reports  . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Article 5. Publication  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     5.1   PENN retains the right to publish the results. . . . . . . . . 3
     5.2   All publications will be treated as invention disclosures. . . 3
     5.3   PENN agrees to use its best efforts in its publications not
           to jeopardize  . . . . . . . . . . . . . . . . . . . . . . . . 3

Article 6. Handling of Confidential Information   . . . . . . . . . . . . 3
     6.1    Each party to this agreement will handle  . . . . . . . . . . 3
     6.2    In order to minimize the potential  . . . . . . . . . . . . . 3
     6.3    Such obligations of confidentiality and limited use . . . . . 3

Article 7. Title to Inventions ..........................................

 Article 8. Patent Applications and Expenses  . . . . . . . . . . . . . . 4
 .    8.1   Control of the preparation. . . . . . . . . . . . . . . . .    4
     8.2   All expenses  . . . . . . . . . . . . . . . . . . . . . . . .  4

  Article 9. Transfer of Rights to Commercialize Intellectual Property
            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4


    9.1    From time 10 time, the results of the General
            Research    . . . . . . . . . . . . . . . .. . . . . . . . .  4
    9.1.1  The Research Results are of no interest to
                      Protatek  . . . . . . . . . . . .  . . . . . . . .  4

    9.1.2   The Research Results are insufficient to
            support a viable patent   . . . . . . . . . . . . . . . . . . 4
    9.1.3   The Research Results can be demonstrated
            to have been previously known   . . . . . . . . . . . . . . . 4
<PAGE>
             9.1.4   The Research Results are of commercial
                              interest to Protatek   . . . . . . . . . . . . 5
             9.2   If the Research Results are insufficiently described or
                    incomplete   . . . . . . . . . . . . . . . . . . . . . . 5
             9.3   If Protatek should elect not to file a patent application 5
             9.4   PENN hereby grants and Protatek hereby accepts . . . . . .5
             9.5   Should Protatek and PENN fail to reach agreement
                    regarding the terms  . . . . . . . . . . . . . . . . . . 5

         Article 10. Term and Termination  . . . . . . . . . . . . . . . . . 6
             10.1   The intent of the parties  . . . . . . . . . . . . . . . 6
             10.2   Should either party to this agreement be at fault. . . . 6
             10.3   Protatek may terminate this agreement  . . . . . . . . . 6
             10.4   PENN may terminate this Agreement  . . . . . . . . . . . 6
             10.5   Surviving termination  . . . . . . . . . . . . . . . . . 6

         Article 11. Miscellaneous   . . . . . . . . . . . . . . . . . . . . 6
              11.1  Notice   . . . . . . . . . . . . . . . . . . . . . . . . 6
                    ------
              11.2  Use of name  . . . . . . . . . . . . . . . . . . . . . . 7
                    -----------
              11.3  Scope  .  . . . . . . . . . . . . . . . . . . . . . . .  7
                    -----
              11.4  Assignability  . . . . . . . . . . . . . . . . . . . . . 7
                    -------------
              11.5  Venue  . . . . . . . . . . . . . . . . . . . . . . . . . 7
                    -----
                    IN WITNESS WHEREOF   . . . . . . . . . . . . . . . . . . 7
<PAGE>
             THIS AGREEMENT, effective  the 1st day  of August  1988, is by  and
         between The Trustees of The University of Pennsylvania, with offices at
         133  South 361h  Street Philadelphia,  PA 19104 ("PENN"),  and Protatek
         International, Inc with offices in Minneapolis, MN 55108 ("Protatek").

             WHEREAS, Dr. Harvey Rubin and Dr. Barry S. Cooperman, faculty
         members of the PENN are interested in studying Protease Inhibitors, and

             WHEREAS, Protatek is interested in such research and wishes to
         commercially develop and exploit the results of such research for the
         good of mankind; and

             WHEREAS, PENN has determined that the research program contemplated
         by  this Agreement furthers  the educational, scholarship  and research
         objectives of PENN as a nonprofit tax-exempt educational institution;

                  NOW, THEREFORE be it agreed among the parties as follows:

         Article 1. Definitions.

         1.1   Field of the Agreement means research related to, the production
               of, or any application of Protease Inhibitors derived from 
               peptides or compounds, methods, know-how, or improvements 
               derived therefrom.

         1.2   Sponsored Research means research performed at PENN with the
               support of Protatek in one or both of two categories: (1) 
               General Research in the Field of the Agreement; and (2) Specific 
               Research directed at potential products and applications of 
               compounds and their derivatives in the Field of the Agreement
               which may result from General Research.

         1.3   The General Research protocol and budget is described in
               Attachment A and is included herein by reference.

         1.4   Specific Research projects may be defined and included in this
               document as addendum labeled "Addendure SRP - n" (where n is the 
               number of the addendum).

         1.5  Proprietary  Information means  any information,  idea  or concept
              which has been  learned or developed by one  party without the aid
              of  the other  party and which  is not generally  available to the
              public.

         1.6    Confidential Information means Proprietary lnformation or
                information developed as unpublished results of Sponsored 
                Research and is marked as such. Excluded from Confidential 
                Information is any information which:

         1.6.1  is within or comes within the public knowledge (but
                only when it so becomes), or 


                                      1
<PAGE>
         1.6.2  developed  independently by  either  party to  this
                agreement outside of  the scope of  this Agreement,
                or

         1.6.3  revealed to either party by third parties authorized to
                reveal such information and under no obligation of 
                confidentiality to either party to this agreement.

         1.7    Invention means any idea, improvement, or enhancement, whether
                patentable or not, which results from Sponsored Research.

         1.8   Patent Expenses means all out-of-pocket expenses directly related
               to  the preparation,  filing,  prosecution  and issuance  of any
               domestic or foreign patent application(s) covering Inventions.

         1.9   Principal Investigators means-Dr. Rubin and/or Dr. Cooperman or
               should the services of either of these two not be available to 
               PENN for any reason, any replacement whom PENN can offer who is 
               acceptable to Protatek as indicated in writing, within sixty 
               (60) days after the unavailability of either original Principal
               Investigator.

         Article 2. Sponsored Research.

         2.1   Sponsored Research will consist of both the General Research
               protocol and Specific Research projects as dictated by General 
               and/or Specific Research results and as agreed to between the 
               parties in writing. Once executed by both parties in writing,
               such Specific Research Project Addenda will be included as
               integral parts of this document. The Specific Research protocols 
               and budgets as outlined in the Addenda may draw funds and 
               research time away from the General Research protocol, or they
               may involve additional resources in terms of time and funding as
               agreed to by the parties.

         Article 3. Payment.

         3.1   Protatek agrees to pay to PENN certain moneys in order to
               partially defray the cost to PENN of the Sponsored Research. 
               The schedule of payments for moneys to be paid by Protatek to 
               PENN are contained in the Attachment B to this document which
               is included herein by reference and which may be amended from
               time to time by mutual written agreement between the parties.

         3.2    PENN is under no obligation to fund any of the Sponsored
                Research.

         3.3    When three or more Research Projects are defined and have not
                been terminated, Protatek agrees to pay PENN an additional per 
                year for administration of intellectual property rights.


                                      2
<PAGE>
         Article 4. Reports.
         4.1   Principal Investigators will generally administer and supervise 
               the Sponsored- Research, and will submit annual written 
               scientific reports.

         Article 5. Publication.

         5.1   PENN retains the right to publish the results of Sponsored
               Research in scholarly journals and meetings, subject to the 
               provisions of this Article and Article 6.

         5.2  All publications will be treated  as invention disclosures for the
              purposes of review  by Protatek  for the  potential disclosure  of
              patentable  inventions. Copies  of  all  proposed publications  or
              abstracts which  result from  Sponsored Research will  be sent  to
              Protatek at least forty-five (45)  days in advance of the expected
              publication  or presentation  date. Should  Protatek  believe that
              such  publication or abstract  would constitute the  disclosure of
              patentable material, Protatek will promptly notify PENN in writing
              of  the relevant  material,  and PENN  will  delay publication  or
              presentation of such  article or abstract until either  (a) a U.S.
              patent application has  been filed, or  (b) the relevant  material
              has been  sufficiently deleted  from the  proposed publication  or
              abstract  so as  not to  present an  obvious public  disclosure of
              patentable material. However, in no event will the requirements of
              (a) or (b) above be allowed to take longer than one hundred twenty
              (120) days.

         5.3   PENN agrees to use its best efforts in its publications not to
               jeopardize the commercial value of the results of Sponsored 
               Research and will bear in mind the editorial comments of 
               Protatek regarding disclosure of non-patentable material and 
               potential trade secrets.

         Article 6. Handling of Confidential Information.

         6.1   Each party to this agreement will handle the other party's
               confidential information with the same degree of security and 
               confidentiality with which it maintains its own confidential 
               information, and will not use such information for any commercial
               purpose without first obtaining license from the owning party.

         6.2  In order  to minimize the  potential for accidental  disclosure of
              Confidential  Information, neither party will give the other party
              any  Confidential  Information  which  is  not  essential  to  the
              performance  of  the   Supported  Research.  Further,   any  party
              receiving  Confidential Information retains the right to refuse to
              accept Confidential Information which it feels is not essential to
              the Supported Research.

         6.3  Such obligations of confidentiality and limited use of
              information shall be maintained for a minimum of  from the date 
              of receipt of any Confidential Information by either party.


                                      3
<PAGE>
         Article 7. Title to Inventions.

        7.1    Title to any Inventions made by personnel employed by Protatek
               will belong to Protatek. Title to any Inventions made by 
               personnel employed by PENN will belong to PENN. Title to 
               Inventions made jointly by personnel employed by Protatek and
               personnel employed by PENN will belong jointly to Protatek and
               PENN.

         Article 8. Patent Applications and Expenses.

         8.1  Control of the preparation,  filing and prosecution of  all patent
              applications will  reside  with  the  party to  whom  the  covered
              Invention belongs. In the case of joint ownership, control will be
              joint. However, both  parties will cooperate  as necessary in  the
              preparation, filing  and prosecution  of all patent.  applications
              covering Inventions.

         8.2   All expenses related to the preparation, filing or prosecution of
               patent applications covering Inventions which belong either 
               jointly or solely to Protatek will be borne by Protatek. All 
               expenses related to the preparation, filing or prosecution of 
               patent applications covering Inventions which belong solely to 
               PENN, but which Protatek wishes to make subject to the grant of 
               the following section will be borne by Protatek. All patent 
               expenses related to applications covering Inventions not subject
               to the grant of the following section will be borne by the party
               to whom the Invention belongs.

         Article 9. Transfer of Rights to Commercialize Intellectual Property.

         9.1   From time to time. the results of the General Research or the
               Specific Research protocols may produce results which may be 
               patentable and which may become the basis for a (further) 
               Specific Research Protocol. If at any time either party believes
               that any research results (from either General Research or
               Specific Research) should become the subject of applications 
               for letters patent, that party will promptly notify the other 
               party in writing, giving the details of such results.
               Within thirty (30) days of receipt of notice by Protatek from 
               PENN, or concurrent with delivery of notice by Protatek to PENN, 
               Protatek will inform PENN as to which of the following
               categories such research results belong:

         9.1.1 The Research Results are of no interest to Protatek and
               shall not be subject to the Grant of Article 9.4, and related 
               patent expenses shall not be borne by Protatek.

        9.1.2  The Research  Results are insufficient to support a
               viable patent application,  but Protatek elects  to
               retain commercial rights to the research results.

        9.1.3  The Research Results can be demonstrated to have been
               previously known by Protatck and developed independently by 
               Protatek and are not therefore


                                     4
<PAGE>
                subject to this Agreement.

        9.1.4   The  Research  Results  are  of commercial  interest  to
                Protatek, are subject  to the grant of  Paragraph 9.4 of
                this   article  and  Protatek   agrees  to  bear  Patent
                Expenses.  Such Research Results may be  of two types as
                further elected by Protatek:

        9.1.4.1 The subject of a new Specific Research Addendum; or

        9.1.4.2 The subject  of either a previous Specific Research
                Addendum  or to  remain  as  part  of  the  General
                Research Protocol.

        9.2    If the Research Results are insufficiently described or
               incomplete so that it becomes impossible for Protatek to make 
               the above election without further description or
               consultation by PENN Protatek may hold such election in abeyance
               until either:
               PENN provides sufficient detail; or additional research results
               are obtained. In no event however, will such delay exceed ninety 
               (90) days from the receipt of notice by Protatek from PENN 
               unless specifically agreed to in writing by the parties.

         9.3   If Protatek should elect not to file a patent application under
               the provisions of sub-paragraph 9.1.2 for a particular research 
               result, and PENN files, prosecutes and is issued a U.S. patent 
               covering these same research results at its own expense, then
               any license to Protatek from PENN under such patent will be
               subject to an additional on end-products covered by such patent.

         9.4  PENN hereby grants and Protatek hereby accepts the exclusive 
              first right to negotiate in good faith for exclusive world-wide 
              license(s) (such license(s) may be non-exclusive
              at Protatek's sole discretion) under any patent for which it has 
              borne or will bear Patent Expenses. Such grant for any specific 
              patent application will automatically terminate six (6) months 
              from the official date of receipt by the U.S. Patent and
              Trademark Office of the relevant patent application unless said 
              grant is exercised as evidenced by: (i) both beginning good faith 
              negotiations and (2) agreement to pay any related Patent Expenses.
              The details of each license agreement will vary from
              technology to technology but will generally follow the format of 
              the License Agreement attached hereto as Attachment C and 
              included herein by reference. The earned royalties on net sales 
              of end-products in such license agreements will generally be 
              between unless either party can provide compelling as to why 
              appropriate.

         9.5  Should Protatek and PENN fail to reach agreement regarding the
              terms of such license, PENN will be free to negotiate license 
              terms with third parties. However, should third party 
              negotiations lead to license terms by PENN essentially similar 
              to those last offered by Protatek, Protatek will be given the 
              opportunity to take license on such terms, before any third 
              party.


                                     5
<PAGE>
         Article 10. Term and Termination.

        10.1   The intent of the parties is that the relationship developed
               herein shall continue from year to year on an on-going basis 
               from the date first written above unless terminated under the 
               provisions included below in this Article or paragraph 1.9.

        10.2   Should either party to this agreement be at fault under the terms
               of this agreement, the other party may terminate this agreement 
               by giving  written notice of intent to terminate and the nature 
               of the fault. If such fault is not corrected within the period, 
               this agreement will terminate with the expiration of the period.

        10.3   Protatek may terminate this agreement upon  prior written notice
               to PENN.

        10.4   PENN may terminate this Agreement upon as prior written notice
               to Protatek if PENN can demonstrate that has notit est efforts 
               or has substantially failed to commercialize the results of 
               Sponsored Research, and which failure is not corrected 
               during said  period.
 
        10.5   Surviving termination of this agreement are the provisions of
               confidentiality and limited use of information contained in 
               article 9, the grant of article 8, and any licenses which may 
               have been negotiated between the parties.

         Article 11. Miscellaneous.

         11.1  Notice. Any notice required under this agreement will be
               ------
               considered given one day after such notice, properly addressed 
               and shipped overnight service, is sent by either party. Proper 
               address for notice is as follows:

               if to PENN:
               Office of Corporate Programs & Technology University of
               Pennsylvania Suite 300
               133 South 36th Street 
               Philadelphia, PA 19104


                                  6
<PAGE>
               if to Protatek: 
                      President
                      Protatek International, Inc. 
                      1425 Energy Park Drive
                      Minneapolis, MN 55108

        11.2  Use of name. Neither party will use the name, insignia or logo
              -----------
              of the other party for any purpose without the prior express 
              written consent of the other party.

        11.3  Scope. This Agreement constitutes the entire agreement between the
              -----
              parties and it reflects and dissolves all prior agreements and 
              drafts related to the subject matter hereof. This agreement may 
              be amended truly by mutual written agreement between the parties.

        11.4   Assignability. This Agreement shall be binding upon and enure to
               -------------
              the parties hereto, their successors and asignees, provided 
              however, that any such assignment by Protatek will require the 
              written approval of PENN. Such approval by PENN will not be 
              withheld by PENN except for reason of situations which might 
              jeopardize the policies, the good name of PENN, or its mission.

        11.5   Venue. This Agreement will be interpreted in and according to the
               -----
              laws of the Commonwealth of Pennsylvania.

              1N WITNESS WHEREOF, both parties set their hand

               for Protatek:,                       for PENN:
              
        /s/                                         /s/ George C. Sambeck
        -----------------------------               -------------------------
               Signed                               Signed 


                                                    Assoc. Dir.
        -----------------------------               -------------------------
               Title                                 Title

                                                    9/21/88
        -----------------------------               -------------------------
               Date                                  Date


                                   7
<PAGE>
         Attachment B: Protatek Alpha-1 Antichymotrypsin License
<PAGE>
                                License Agreement Between
                    The Trustees of The University of Pennsylvania and
                                Protatek International, Inc. 
                                (alpha-1 Antichymotrypsin)
<PAGE>
       Table of Contents:

       Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . . . . . 1
            1.1.  Licensed Technology  . . . . . . . . . . . . . . . . . . . . 1
            1.2.  Licensed Patent  . . . . . . . . . . . . . . . . . . . . . . 1
            1.3.  Ultimate Consumer  . . . . . . . . . . . . . . . . . . . . . 2
            1.4.  Licensed Product(s)  . . . . . . . . . . . . . . . . . . . . 2
            1.5.  Net Sales  . . . . . . . . . . . . . . . . . . . . . . . . . 2
            1.6.  Protatek is understood to include all of its Affiliates. . . 2

       Article 2. Grant  . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
             2.1. PENN grants to Protatek  . . . . . . . . . . . . . . . . . . 2

       Article 3. Compliance with Laws, Regulations and Standards  . . . . . . 2
            3.1.  Protatek agrees to comply with .all governmental   . . . . . 2
            3.2.  With respect to operations by the Protatek   . . . . . . . . 2

       Article 4. Consideration  . . . . . . . . . . . . . . . . . . . . . . . 3
            4.1.  In consideration of the rights granted herein, License shall
       pay to
                  PENN certain amounts   . . . . . . . . . . . . . . . . . . . 3
             4.2  All amounts due hereunder  . . . . . . . . . . . . . . . . . 3

       Article 5. Reports, Payments and Accounting   . . . . . . . . . . . . . 3
            5.1.  Protatek agrees to make written reports to PENN  . . . . . . 3
            5.2.  Protatek also agrees to make a similar written report to
       PENN within
                  three months after the date of the Termination   . . . . . . 3
            5.3.  Concurrently with the making of each report  . . . . . . . . 3
            5.4.  Protatek agrees to keep records showing the manufacture,
       sales, use,
                  rentals, and leasing   . . . . . . . . . . . . . . . . . . . 3

       Article 6. Warranties and Indemnities   . . . . . . . . . . . . . . . . 3
             6.1.  Nothing in this Agreement shall be construed  . . . . . . . 3
             6.2.  PENN makes no representations and extends no warranties . . 4
             6.3.  Protatek shall indemnify and hold harmless PENN against any
       charge
                   or claim  . . . . . . . . . . . . . . . . . . . . . . . . . 4

        Article 7. Infringement by Others: Protection of Patents   . . . . . . 4
             7.1.  Protatek shall promptly inform PENN   . . . . . . . . . . . 4
             7.2.  Protatek and PENN shall consider whether and in what manner
                   litigation  . . . . . . . . . . . . . . . . . . . . . . . . 5

         Article 8. Commercial Application, Sublicenses  . . . . . . . . . . . 5
             8.1.  Any sublicense granted by Protatek  . . . . . . . . . . . . 5
             8.2.  Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee  . . . . . . . . .6
<PAGE>
         Article 9. Term and Termination   . . . . . . . . . . . . . . .  6
              9.1.  The word "Termination"   . . . . . . . . . . . . . .  6
              9.2.  If Protatek shall at any time default in the payment   
                                                                          6
              9.3.  Protatek shall have the right to Terminate this License
         Agreement in
                    respect to any or all Licensed Patents,  . . . . . .  6

         Article 10. Assignment  . . . . . . . . . . . . . . . . . . . .   7

         Article 11. Applicable Law  . . . . . . . . . . . . . . . . . .   7

         Article 12. Arbitration   . . . . . . . . . . . . . . . . . . .   7

         Article 13. Notices   . . . . . . . . . . . . . . . . . . . . .   7

         Article 14. Waiver  . . . . . . . . . . . . . . . . . . . . . .   8

         Article 15. Scope of the Agreement and Integration  . . . . . .   8

               IN WITNESS WHEREOF  . . . . . . . . . . . . . . . . . . .   9
<PAGE>
             This Agreement is by and between The  Trustees of The University of
         Pennsylvania, a non-profit corporation  with offices at 133 South  36th
         Street,  Philadelphia, PA 19104 (PENN), and Protatek International, Inc
         with   Offices  at  1245  Energy  Park  Drive,  Minneapolis,  MN  55108
         (Protatek).

             Whereas, PENN has discovered human genetic material encoding for
         certain peptides which function as inhibitors of proteases; and

             Whereas,  Protatek  has  certain  proprietary  know-how  and  trade
         secrets essential to the production, purification and  characterization
         of biological materials important  to the future exploitation  of these
         protease inhibitors; and

             Whereas, PENN  and Protatek  have executed  a Cooperative  Research
         Agreement,  specifying the  terms and  conditions for  research in  the
         development of such peptides into useful and valuable products; and

             Whereas,  under the terms  of such Cooperative  Research Agreement,
         PENN and  Protatek have agreed  to certain apportionment of  rights and
         responsibilities and the conditions of cooperation  in the research and
         commercial development of such research results, if any; and

             Whereas, Protatek has supported, in part, the research which has
         lead to the results the commercialization of which is contemplated by
         this Agreement; and

             Whereas, PENN wishes to develop and commercially exploit, for the
         good of mankind, the results of such research; and

             Whereas, PENN desires to see that the results of its research are
         expeditiously and competently developed for the good of mankind;

         Now Therefore, be it agreed among the parties as follows:

         Article 1. Definitions
                   1.1. Licensed  Technology means  all inventions,  designs and
                        technology related to  alpha-1 Anti-Chymotrypsin encoded
                        for  by human  DNA and  discovered by  Dr.  Harvey Rubin
                        and/or  his  coworkers  at  PENN  whether   patented  or
                        unpatented, including  all know-how for  practicing such
                        inventions  and technology related to such alpha-1 Anti-
                        Chymotrypsin   including    inventions,   designs    and
                        technology  relating to the active site of said protease
                        inhibitor, its analogues,  and their formulation(s)  and
                        applications.

                1.2.  Licensed Patent means United States letters patent or
         applications therefore and any corresponding foreign (to the United 
         States) applications and foreign patents which have issued or may 
         issue as a result of corresponding foreign patent application and 
         any continuation, continuation-in-part, division, reissue or 
         substitute applications based on any of the foregoing within the 
         Licensed Technology unless and until such patent or application 
         has been abandoned,
                                                1
<PAGE>
                   has lapsed or has been ruled to be wholly invalid by a court
                   of competent jurisdiction.

               1.3. Ultimate Consumer means that person or entity whose use of
         the product results in its destruction or loss of activity and/or loss
         of value.

               1.4. Licensed Product(s) means materials (including expression
         systems) which in the course of manufacture, use or sale would, in the 
         absence of this license, be covered by one or more claims of Licensed 
         Patent which have not been held invalid by a court from which no 
         appeal may be taken.

              1.5. Net  Sales means  the  gross  sales,  received  by  Protatek,
                   whether  invoiced  or  not,  less:  returns  and   allowances
                   actually granted; packing,  insurance, freight out,  taxes or
                   excise  duties imposed  on  the  transaction  (if  separately
                   invoiced); wholesaler discounts; and cash discounts.

               1.6. Protatek is understood to include all of its Affiliates. An
         Affiliate of Protatek shall mean any corporation or other business 
         entity controlled by, controlling, or under common control with 
         Protatek. 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.

         Article 2. Grant

               2.1. PENN grants to Protatek a world-wide exclusive, right and
         license to make, have made, use and sell Licensed Products under 
         Licensed Patent. Such right and license shall include the right to 
         sublicense under terms consistent with this Agreement but without 
         further right to sublicense.

         Article 3. Compliance with Laws, Regulations and Standards

              3.1. Protatek  agrees to  comply with  all  governmental laws  and
                   regulations  applicable to the use, production and/or sale of
                   Licensed Products.

                   With respect  to  operations by  the Protatek  in the  United
                   States,   its    territories   and    possessions,   Protatek
                   specifically expresses its intent to comply with the physical
                   and biological  containment standards  set forth  in the  NIH
                   Guidelines for Research Involving Recombinant DNA  Molecules,
                   dated 21 November 1980, or any subsequent amended version  of
                   U.S. Government guidelines or regulations pertaining to  such
                   activities  in  effect  during the  term  of  this Agreement.
                   Protatek  further   agrees  to   cooperate  with   government
                   agency(ies)  authorized  to   monitor  compliance  with  such
                   containment standards.

         Article 4. Consideration

              4.1. In consideration of the rights granted herein, License shall 
                   pay to PENN certain amounts which have been agreed to in 
                   principle and will be embodied
                                              2
<PAGE>
                   in a separate writing between  the parties. Such amounts  may
                   include   consideration    for:   License    initiation   and
                   maintentance, minimum royalties and earned royalties.

              4.2   All amounts due hereunder by Protatek to PENN shall be paid
                    to PENN in United States Dollars and shall be paid and 
                    reported upon in a manner consistent with Article 5 hereof.

         Article 5. Reports, Payments and Accounting

              5.1  Protatek agrees to make written reports to PENN within sixty
                   (60) days of each June 30 and each December 31 during the 
                   term of this License Agreement stating in each such report 
                   the number of units and Net Sales of Licensed Product(s) 
                   upon which consideration is payable pursuant to Article
                   4 hereof for the prior six month period.

              5.2. Protatek also agrees to make a similar written report to PENN
                   within three months after the date of the Termination of 
                   this License Agreement on Licensed Products(s) used, sold, 
                  rented, or leased by Protatek and upon which consideration 
                  is payable hereunder but which were not previously reported.

              5.3. Concurrently  with the making  of each report  required under
                   this Article, Protatek  shall pay to PENN  all considerations
                   due in connection with the transactions so reported.

               5.4. Protatek agrees to keep records showing the manufacture,
                    sales, use, rentals, and leasing of Licensed Products in 
                    sufficient detail to enable the considerations due and 
                    payable hereunder by Protatek to be determined, and
                    further agrees to permit its books and records to be
                    examined from time to time, but not more than once a year, 
                    to the extent necessary to verify reports provided for in 
                    Paragraphs 5.1 and 5.2 of this Article. Such examination is 
                    to be made by an independent, certified accountant 
                    appointed by PENN, with the fees and expenses to be borne 
                    by PENN. Only those considerations due to PENN within the 
                    three year period immediately preceding the start of the 
                    audit and their supporting records, files, and books of 
                    account shall be subject to audit.

         Article 6. Warranties and Indemnities

               6.1. Nothing in this Agreement shall be construed as:

               6.1.1.  A warranty or  representation by PENN  as to the
                       validity or scope of any Licensed Patent;

               6.1.2.  A  warranty  or representation  that  anything
                       made,  used, sold, rented or leased, under any
                       license granted by this  Agreement is or  will
                       be free from infringement  of patents of third
                       parties;
                                            3
<PAGE>
               6.1.3.    An obligation to bring or prosecute actions or suit
                         against third parties for infringement;

               6.1.4.    Conferring   a  right   to   use  in   advertising,
                         publicity, or otherwise any trademark or trade name
                         of either party; or

               6.1.5.    Granting by implication, estoppel, or otherwise any
                         licenses or rights under patents of PENN other than
                         Licensed  Patents,   regardless  of   whether  such
                         patents dominate or are subordinate to any Licensed
                         Patents.
                   The foregoing  notwithstanding, PENN hereby  informs Protatek
                   that  it  knows of  no  patents which  dominate  the Licensed
                   Patents and under which PENN has the right to grant licenses.

               6.2. PENN  makes no representations  and extends no  warranties 
                    of any kind, either expressed or implied. There are no 
                    expressed or implied  warranties of  merchantability 
                    or  fitness for  a particular purpose, or that the 
                    use  of the Licensed Products will  not infringe any 
                    patent, copyright, trademark, or other rights 
                    of any person.
 

               6.3. Protatek shall indemnify and hold harmless PENN against any
                    charge or claim made by a third party on account of the 
                    rights and license which are objects of this License 
                    Agreement. By way of example, but without limitation,

                    PENN shall be indemnified against loss due to charges of
         product liability, medical malpractice and the like which may be 
         levied against PENN on account of licensed sales pursuant to this 
         License Agreement.

         Article 7. Infringement by Others: Protection of Patents

              7.1. Protatek   shall  promptly  inform   PENN  of  any  suspected
                   infringement of  any Licensed Patent  by a third  party. PENN
                   and  Protatek   shall  consult   to   determine  whether   an
                   infringement exists  and how  best to  effect its  abatement.
                   This consultation and  all related consultations shall  be in
                   furtherance  of the community of interest extant between PENN
                   and Protatek as exemplified by this License Agreement.

               7.2. Protatek and PENN shall consider whether and in what manner
                    litigation or other adjudicative procedures may be brought 
                    against an infringer. PENN and Protatek each shall have the 
                    right to institute an action for infringement of a
                    Licensed Patent against such third party in accordance with
                    the following or such other arrangement as the parties may 
                    agree upon:

               7.2.1. If  PENN and  Protatek agree  to  institute a  suit
                      jointly,  the suit shall  be brought in  both their
                      names, the out-of pocket costs thereof shall

                                            4

<PAGE>
                        be borne  equally, and  recoveries, if  any, whether  by
                        judgment, award, decree, or settlement,  shall be shared
                        equally.  Protatek  shall  exercise  control  over  such
                        action  provided, however,  that  PENN  may,  if  it  so
                        desires, be represented by counsel of its own selection,
                        the fees for  which counsel shall be paid  by PENN. PENN
                        shall  have  the  right  to  approve  the  selection  of
                        litigation counsel  and the proposed  litigation budget,
                        which approval shall not unreasonably  be withheld. PENN
                        shall  have the right  to approve any  settlement of the
                        litigation.

                   7.2.2.    In the  absence of  agreement to  institute a  suit
                             jointly,  PENN  may  institute  suit  and,  at  its
                             option, join  Protatek as  a plaintiff.  PENN shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery by way of judgment or settlement. Protatek
                             will cooperate fully in the prosecution of any such
                             suit.

                   7.2.3.    In the  absence of  agreement to  institute a  suit
                             jointly,  and if PENN determines not to institute a
                             suit, Protatek  may  institute suit,  and, and  its
                             option, join  PENN as a  plaintiff. Protatek  shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery  by way  of  judgment,  award, decree,  or
                             settlement   for  past   infringement.  PENN   will
                             cooperate  fully  in the  prosecution  of  any such
                             suit.

                   7.2.4.    Should either  PENN  or Protatek  commence  a  suit
                             under the provisions of this Article and thereafter
                             elect to  abandon the  same, it  shall give  timely
                             notice  to  the  other  party  who  may,  if  it so
                             desires,   continue   prosecution  of   such   suit
                             provided, however, that the sharing of expenses and
                             any  recovery in  such suit  shall  be agreed  upon
                             between PENN and Protatek.

         Article 8. Commercial Application, Sublicenses

              8.1. Any  sublicense  granted  by   Protatek  under  this  License
                   Agreement shall be  consistent with the terms  and conditions
                   of this License  Agreement, except that sublicense  terms and
                   conditions  shall  reflect  that  any  sublicensee shall  not
                   further sublicense.

              8.2. Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee, including the 
                   payment of considerations specified in such sublicenses, 
                   to PENN or its designee, in the event that this License 
                   Agreement is terminated and not promptly reinstated.

         Article 9. Term and Termination

              9.1. The word "Termination" and cognate words, such as "Term" and
         "Terminate," as used in this License Agreement, are to be read, except 
         where the contrary is specifically indicated, as omitting from their 
         effect the  following rights and

                                              5
<PAGE>
                   obligations, all of which survive any Termination to the
                   degree necessary to permit their complete fulfillment or
                   discharge:

                   9.1.1.    Protatek's obligation  to supply a  terminal report
                             as specified in Paragraph 5.2 hereof;

                   9.1.2.    PENN's right  to receive or recover  and Protatek's
                             obligation  to  pay  royalties,  including  minimum
                             royalties, pursuant to Articles 4 and 5 hereof, due
                             or   accruable  for   payment   at  the   time   of
                             Termination;

                   9.1.3.   Protatek's obligation to maintain records and PENN's
                            right to conduct an audit as provided in Article 5 
                            hereof;

                   9.1.4.    Licenses and releases running in favor of customers
                             of  Protatek   and  Protatek's   sublicensees  with
                             respect to Licensed Product(s) sold or  transferred
                             prior to any termination and on which consideration
                             has been paid or is  payable by Protatek to PENN as
                             provided in Articles 4 and 8 hereof;

                   9.1.5.    Any  cause of  action  or  claim  of  either  party
                             hereto,  accrued or to accrue because of any breach
                             or default by the other party; and

                   9.1.6. The provisions of Article 7.

              9.2. If Protatek shall at any time default in the payment of any
                   consideration or in the making of any report hereunder, or 
                   shall commit any material breach of any covenant herein 
                   contained, or shall make any materially false report
                   and shall fail to remedy any such default, breach, or report
                   within ninety (90) days after written notice thereof by 
                   PENN, PENN may, at its option, Terminate this License 
                   Agreement and the licenses herein granted by notice
                   in writing to such effect.

              9.3. Protatek shall have the right to Terminate this License 
                   Agreement in respect to any or all Licensed Patents, upon 
                   giving at least written notice to PENN of its intention and
                   desire to terminate.

         Article 10. Assignment
              This  Agreement shall  be binding  upon and  enure to  the parties
              hereto, their successors and asignees, provided, however, that any
              such assignment by  Protatek will require the  written approval of
              PENN. Such approval by  PENN will not  be withheld by PENN  except
              for reason of situations which  might jeopardize the policies, the
              good name of PENN, or its mission.

         Article 11. Applicable Law
              This  License  Agreement  shall  be  construed,  interpreted,  and
              applied  in  accordance  with  the  laws of  the  Commonwealth  of
              Pennsylvania.

                                      6
<PAGE>
         Article 12. Arbitration
              12.1.     Any controversy arising under or related to this License
                        Agreement,  and  any  disputed  claim  by  either  party
                        against   the  other   under  this   License  Agreement,
                        including,  without  limitation,  disputes  relating  to
                        patent  validity  or  infringement shall  be  settled by
                        arbitration,  upon  the  request   of  either  party  in
                        accordance with  the then-prevailing  Patent Arbitration
                        Rules of the American Arbitration  Association (AAA). In
                        the  event  of  such controversy,  the  matter  shall be
                        submitted to one arbitrator knowledgeable in the  field,
                        who has been selected by mutual agreement of the parties
                        hereto or by the AAA if the parties cannot agree.

             12.2.  Any arbitration under Paragraph 13.1 hereof shall be held at
                    Philadelphia, Pennsylvania, or such other place as may be 
                    mutually agreed upon in writing between the parties. 
                   Judgment upon the award rendered by the arbitrator
                    may be entered in any court having jurisdiction thereof.

         Article 13. Notices

             13.1.  All notices, demands, or other writings provided for in this
                    Agreement to be given, made, or sent by either party to the 
                   other, shall be deemed to have been fully given, made, or 
                   sent when done in writing and deposited in the

                    United States mail, first class, postage prepaid, and
         addressed as follows:

                    To PENN:  University of Pennsylvania
                              Office of Research Administration
                              133 South 36th Street
                              Suite 300
                              Philadelphia, Pennsylvania 19104-3246

                        Attention: Associate Director

                   To Protatek: President
                        Protatek International, Inc.     
                        1425 Energy Park Drive 
                        Minneapolis, MN 55108

             13.2.  The address to which any notice, demand, or other writing
                    may be given or made or sent to any party may be changed 
                    upon written notice given by such party as above provided.

         Article 14. Waiver

              The  parties covenant  and agree that,  if either  party hereunder
              fails or  neglects for any reason to take  advantage of any of the
              terms  of this License Agreement providing  for the Termination of
              this License Agreement, or if a party, having the
                                            7
<PAGE>
              right to declare this License Agreement terminated,  shall fail to
              do so,  any such failure or neglect by such  party shall not be or
              be  deemed or be  construed to  be a waiver  of any of  the terms,
              covenants, or  conditions  of this  License  Agreement or  of  the
              performance  thereof. None of the terms, covenants, and conditions
              of  this License  Agreement can  be waived  except by  the written
              consent of the party waiving compliance.

         Article 15. Scope of the Agreement and Integration

         1.5.1.  The article headings herein are for convenience only and in
                 no manner affect the rights and obligations of the parties, 
                 nor shall they be used to interpret the provisions hereof.

         1.5.2.  This License Agreement and the above-identified Cooperative
                 Research '.   Agreement constitute the entire agreement 
                 between the parties pertaining to the subject matter hereof.

             IN WITNESS WHEREOF,  the parties hereto have executed  this License
         Agreement in duplicate  originals by their officers  or representatives
         duly authorized as of the date executed.

      The Trustees of The University            For Protatek International, Inc
             of Pennsylvania 

        /s/                                     /s/ George C. Sambeck
        -----------------------------           -------------------------
               Signed                           Signed 

        President                               Assoc. Dir.
        -----------------------------           -------------------------
               Title                             Title
                                                9/21/88
        -----------------------------           -------------------------
               Date                              Date

                                     8
<PAGE>
         Attachment C: Protatek Cl Esterase License Agreement
<PAGE>
                                License Agreement Between
                    The Trustees of The University of Pennsylvania 
                                         and 
                             Protatek International, Inc. 
                                (C1 Esterase Inhibitor)
<PAGE>
         Table of Contents:
         Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . .  1
              1.1.  Licensed Technology  . . . . . . . . . . . . . . . . .  1
              1.2.  Licensed Patent  . . . . . . . . . . . . . . . . . . .  1
              1.3.  Ultimate Consumer  . . . . . . . . . . . . . . . . . .  2
              1.4.  Licensed Product(s)  . . . . . . . . . . . . . . . . .  2
              1.5.  Net Sales  . . . . . . . . . . . . . . . . . . . . . .  2
              1.6.  Protatek is understood to include all of its 
                      Affiliates . . . . . . . . . . . . . . . . . . . . .  2
         Article 2. Grant  . . . . . . . . . . . . . . . . . . . . . . . .  2
               2.1. PENN grants to Protatek  . . . . . . . . . . . . . . .  2
         Article 3. Compliance with Laws, Regulations and Standards  . . .  2
              3.1.  Protatek agrees to comply with .all governmental   . .  2
              3.2.  With respect to operations by the Protatek   . . . . .  2
         Article 4. Consideration  . . . . . . . . . . . . . . . . . . . .  3
              4.1.  In consideration of the rights granted herein, 
                      License shall pay to PENN certain amounts    . . . .  3
               4.2  All amounts due hereunder  . . . . . . . . . . . . . .  3
         Article 5. Reports, Payments and Accounting   . . . . . . . . . .  3
              5.1.  Protatek agrees to make written reports to PENN  . . .  3
              5.2.  Protatek also agrees to make a similar written 
                      report to PENN within three months after the 
                      date of the Termination  . . . . . . . . . . . . . .  3
              5.3.  Concurrently with the making of each report  . . . . .  3
              5.4.  Protatek agrees to keep records showing the 
                      manufacture, sales, use, rentals, and leasing  . . .  3
         Article 6. Warranties and Indemnities   . . . . . . . . . . . . .  3
               6.1.  Nothing in this Agreement shall be construed  . . . .  3
               6.2.  PENN makes no representations and extends no 
                       warranties . . . . . . . . . . . . . . . . . . . . . 4
               6.3.  Protatek shall indemnify and hold harmless PENN 
                       against any charge or claim  . . . . . . . . . . . . 4
          Article 7. Infringement by Others: Protection of Patents   . . .  4
               7.1.  Protatek shall promptly inform PENN   . . . . . . . .  4
               7.2.  Protatek and PENN shall consider whether and in what 
                       manner litigation  . . . . . . . . .  . . . . . . .  5
           Article 8. Commercial Application, Sublicenses  . . . . . . . .  5
               8.1.  Any sublicense granted by Protatek  . . . . . . . . .  5
               8.2.  Any such sublicense may provide for the transfer 
                       of all rights and obligations of the sublicensee  .  6
<PAGE>
         Article 9. Term and Termination   . . . . . . . . . . . . . . . .  6
              9.1.  The word "Termination"   . . . . . . . . . . . . . . .  6
              9.2.  If Protatek shall at any time default in the payment .  6
              9.3.  Protatek shall have the right to Terminate this 
                      License Agreement in respect to any or all 
                      Licensed Patents,  . . . . . . . . . . . . . . . . .  6
         Article 10. Assignment  ... . . . . . . . . . . . . . . . . . . .  7
         Article 11. Applicable Law  . . . . . . . . . . . . . . . . . . .  7
         Article 12. Arbitration   . . . . . . . . . . . . . . . . . . . .  7
         Article 13. Notices   . . . . . . . . . . . . . . . . . . . . . .  7
         Article 14. Waiver  . . . . . . . . . . . . . . . . . . . . . . .  8
         Article 15. Scope of the Agreement and Integration  . . . . . . .  8
               IN WITNESS WHEREOF  . . . . . . . . . . . . . . . . . . . .  9
<PAGE>
             This Agreement is by and between The  Trustees of The University of
         Pennsylvania, a non-profit corporation  with offices at 133 South  361h
         Street,  Philadelphia, PA 19104 (PENN), and Protatek International, Inc
         with   Offices  at  1245  Energy  Park  Drive,  Minneapolis,  MN  55108
         (Protatek).

             Whereas, PENN has discovered human genetic material encoding for
         certain peptides which function as inhibitors of proteases; and

             Whereas,  Protatek  has  certain  proprietary  know-how  and  trade
         secrets essential to the production, purification and  characterization
         of biological materials important  to the future exploitation  of these
         protease inhibitors; and

             Whereas, PENN  and Protatek  have executed  a Cooperative  Research
         Agreement,  specifying the  terms and  conditions for  research in  the
         development of such peptides into useful and valuable products; and

             Whereas,  under the terms  of such Cooperative  Research Agreement,
         PENN and  Protatek have agreed  to certain apportionment of  rights and
         responsibilities and the conditions of cooperation  in the research and
         commercial development of such research results, if any; and

             Whereas, Protatek has supported, in part, the research which has
         lead to the results the commercialization of which is contemplated by
         this Agreement; and

             Whereas, PENN wishes to develop and commercially exploit, for the
         good of mankind, the results of such research; and

             Whereas, PENN desires to see that the results of its research are
         expeditiously and competently developed for the good of mankind;

         Now Therefore, be it agreed among the parties as follows:

         Article 1. Definitions
                   1.1. Licensed  Technology means  all inventions,  designs and
                        technology related to C1  Esterase Inhibitor encoded for
                        by  human DNA and discovered  by Dr. Harvey Rubin and/or
                        his coworkers  at   PENN  whether   patented  or
                        unpatented, including  all know-how for  practicing such
                        inventions  and technology  related to such  C1 Esterase
                        Inhibitor including  inventions, designs  and technology
                        relating  to the active site of said protease inhibitor,
                        its    analogues,   and    their   formulation(s)    and
                        applications.

                1.2.  Licensed Patent means United States letters patent or
         applications therefore and any corresponding foreign (to the United 
         States) applications and foreign patents which have issued or may 
         issue as a result of corresponding foreign patent application and 
         any continuation, continuation-in-part, division, reissue
         or substitute applications based on any of the foregoing within
         the Licensed Technology unless and until such patent or application 
         has been abandoned,
                                                1
<PAGE>
                   has lapsed or has been ruled to be wholly invalid by a court
                   of competent jurisdiction.

              1.3. Ultimate Consumer means that person or entity whose use of
         the product results in its destruction or loss of activity and/or loss 
         of value.

              1.4. Licensed Product(s) means materials (including expression
         systems) which in the course of manufacture, use or sale would, in the 
        absence of this license, be covered by one or more claims of Licensed 
        Patent which have not been held invalid by a court from which no appeal 
        may be taken.

              1.5. Net  Sales means  the  gross  sales,  received  by  Protatek,
                   whether  invoiced  or  not,  less:  returns  and   allowances
                   actually granted; packing,  insurance, freight out,  taxes or
                   excise  duties imposed  on  the  transaction  (if  separately
                   invoiced); wholesaler discounts; and cash discounts.

               1.6. Protatek is understood to include all of its Affiliates. An
         Affiliate of Protatek shall mean any corporation or other business 
         entity controlled by, controlling, or under common control with 
         Protatek. 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.

         Article 2. Grant

               2.1. PENN grants to Protatek a world-wide exclusive, right and
         license to make, have made, use and sell Licensed Products under 
         Licensed Patent. Such right and license shall include the right to 
         sublicense under terms consistent with this Agreement but without 
         further right to sublicense.

         Article 3. Compliance with Laws, Regulations and Standards

              3.1. Protatek  agrees to  comply with  all  governmental laws  and
                   regulations  applicable to the use, production and/or sale of
                   Licensed Products.

               3.2. With respect to operations by the Protatek in the United
         States, its territories and possessions, Protatek specifically 
         expresses its intent to comply with the physical anti biological 
         containment standards set forth in the NIH Guidelines
         for Research Involving Recombinant DNA Molecules, dated 21
         November 1980, or any subsequent amended version of U.S. Government
         guidelines or regulations pertaining to such activities in effect 
         during the term of this 

                    Agreement. Protatek further agrees to cooperate with
         government agency(ies) authorized to monitor compliance with such 
         containment standards.

         Article 4. Consideration

         4.1. In consideration of the rights granted herein, License shall pay
         to PENN certain amounts which have been agreed to in principle and will
         be embodied
                                               2
<PAGE>
                   in a separate writing between  the parties. Such amounts  may
                   include   consideration    for:   License    initiation   and
                   maintenance, minimum royalties and earned royalties.

             4.2    All amounts due hereunder by Protatek to PENN shall be paid
         to PENN in United States Dollars and shall be paid and reported upon in
         a manner consistent with Article 5 hereof.

         Article 5. Reports, Payments and Accounting

               5.1. Protatek agrees to make written reports to PENN within sixty
         (60) days of each June 30 and each December 31 during the term of this
         License Agreement stating in each such report the number of units
         and Net Sales of Licensed Product(s) upon which consideration is 
         payable pursuant to Article 4 hereof for the prior six month period.

               5.2. Protatek also agrees to make a similar written report to 
         PENN within three months after the date of the Termination of this 
         License Agreement on Licensed Products(s) used, sold, rented, or 
         leased by Protatek and upon which consideration is payable hereunder 
         but which were not previously reported.

              5.3. Concurrently  with the making  of each report  required under
                   this Article, Protatek  shall pay to PENN  all considerations
                   due in connection with the transactions so reported.

               5.4. Protatek agrees to keep records showing the manufacture,
         sales, use, rentals, and leasing of Licensed Products in sufficient 
         detail to  enable the considerations due and payable hereunder by 
         Protatek to be determined, and further agrees to pertnit its books 
         and records to be examined from time to time, but not more than once 
         a year, to the extent necessary to verify reports   provided for in 
         Paragraphs 5.1 and 5.2 of this Article. Such examination is to be 
         made by an independent, certified accountant appointed by PENN, with 
         the fees and expenses to be borne by PENN. 
         Only those considerations due to PENN within the three year period 
         immediately preceding the start of the audit anti their supporting 
         records, files, and books of account shall be subject to audit.

         Article 6. Warranties and Indemnities

                  6.1. Nothing in this Agreement shall be construed as:

                   6.1.1.    A  warranty or  representation by  PENN  as to  the
                             validity or scope of any Licensed Patent;

                   6.1.2.    A  warranty  or representation  that  anything
                             made,  used, sold, rented or leased, under any
                             license granted by this  Agreement is or  will
                             be free from infringement  of patents of third
                             parties;

                                            3
<PAGE>
                   6.1.3.    An obligation to bring or prosecute actions or suit
                             against third parties for infringement;

                   6.1.4.    Conferring   a  right   to   use  in   advertising,
                             publicity, or otherwise any trademark or trade name
                             of either party; or

                   6.1.5.    Granting by implication, estoppel, or otherwise any
                             licenses or rights under patents of PENN other than
                             Licensed  Patents,   regardless  of   whether  such
                             patents dominate or are subordinate to any Licensed
                             Patents.

                   The foregoing  notwithstanding, PENN hereby  informs Protatek
                   that  it  knows of  no  patents which  dominate  the Licensed
                   Patents and under which PENN has the right to grant licenses.

              6.2. PENN  makes no representations  and extends no  warranties of
                   any kind, either expressed or implied. There are no expressed
                   or implied  warranties of  merchantability or  fitness for  a
                   particular purpose, or that the use  of the Licensed Products
                   will  not infringe any patent, copyright, trademark, or other
                   rights of any person.

              6.3. Protatek shall indemnify and hold harmless PENN against any
         charge or claim made by a third party on account of the rights and
         license which are objects of this License Agreement. By way of example,
         but without limitation,

                   PENN shall be indemnified against loss due to charges of
         product liability, medical malpractice and the like which may be 
         levied against PENN on account of licensed sales pursuant to this 
          License Agreement.

         Article 7. Infringement by Others: Protection of Patents

              7.1. Protatek  shall  promptly   inform  PENN  of  any   suspected
                   infringement  of any Licensed  Patent by a  third party. PENN
                   and   Protatek  shall   consult   to  determine   whether  an
                   infringement exists  and how  best to  effect its  abatement.
                   This consultation and  all related consultations shall  be in
                   furtherance  of the community of interest extant between PENN
                   and Protatek as exemplified by this License Agreement.

               7.2. Protatek and PENN shall consider whether and in what manner
                    litigation or other adjudicative procedures may be brought 
                    against an infringer. PENN and Protatek each shall have the 
                    right to institute an action for infringement of a
                    Licensed Patent against such third party in accordance with
                    the following or such other arrangement as the parties may 
                    agree upon:

                   7.2.1.    If  PENN and Protatek agreement to institute a suit
                             jointly,  the suit shall  be brought in  both their
                             names, the out-of pocket costs thereof shall
                                            4
<PAGE>
                        be borne  equally, and  recoveries, if  any, whether  by
                        judgment, award, decree, or settlement,  shall be shared
                        equally.  Protatek  shall  exercise  control  over  such
                        action  provided, however,  that  PENN  may,  if  it  so
                        desires, be represented by counsel of its own selection,
                        the fees for  which counsel shall be paid  by PENN. PENN
                        shall  have  the  right  to  approve  the  selection  of
                        litigation counsel  and the proposed  litigation budget,
                        which approval shall not unreasonably  be withheld. PENN
                        shall  have the right  to approve any  settlement of the
                        litigation.

                   7.2.2.    In the  absence of  agreement to  institute a  suit
                             jointly,  PENN  may  institute  suit  and,  at  its
                             option, join  Protatek as  a plaintiff.  PENN shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery by way of judgment or settlement. Protatek
                             will cooperate fully in the prosecution of any such
                             suit.

                   7.2.3.    In the  absence of  agreement to  institute a  suit
                             jointly,  and if PENN determines not to institute a
                             suit, Protatek  may  institute suit,  and, and  its
                             option, join  PENN as a  plaintiff. Protatek  shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery  by way  of  judgment,  award, decree,  or
                             settlement   for  past   infringement.  PENN   will
                             cooperate  fully  in the  prosecution  of  any such
                             suit.

                   7.2.4.    Should either  PENN  or Protatek  commence  a  suit
                             under the provisions of this Article and thereafter
                             elect to  abandon the  same, it  shall give  timely
                             notice  to  the  other  party  who  may,  if  it so
                             desires,   continue   prosecution  of   such   suit
                             provided, however, that the sharing of expenses and
                             any  recovery in  such suit  shall  be agreed  upon
                             between PENN and Protatek.

         Article 8. Commercial Application, Sublicenses

              8.1. Any  sublicense  granted  by   Protatek  under  this  License
                   Agreement shall be  consistent with the terms  and conditions
                   of this License  Agreement, except that sublicense  terms and
                   conditions  shall  reflect  that  any  sublicensee shall  not
                   further sublicense.

              8.2. Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee, including the 
                   payment of considerations specified in such sublicenses, 
                   to PENN or its designee, in the event that this License 
                   Agreement is terminated and not promptly reinstated.

         Article 9. Term and Termination

              9.1. The word "Termination" and cognate words, such as "Term" and
         "Terminate," as used in this License Agreement, are to be read, except 
         where the contrary is specifically indicated, as omitting from their 
         effect the  following rights and

                                              5
<PAGE>
                   obligations, all of which survive any Termination to the
                   degree necessary to permit their complete fulfillment or
                   discharge:

                   9.1.1.    Protatek's obligation  to supply a  terminal report
                             as specified in Paragraph 5.2 hereof;

                   9.1.2.    PENN's right  to receive or recover  and Protatek's
                             obligation  to  pay  royalties,  including  minimum
                             royalties, pursuant to Articles 4 and 5 hereof, due
                             or   accruable  for   payment   at  the   time   of
                             Termination;

                   9.1.3.   Protatek's obligation to maintain records and PENN's
                            right to conduct an audit as provided in Article 5 
                            hereof;

                   9.1.4.    Licenses and releases running in favor of customers
                             of  Protatek   and  Protatek's   sublicensees  with
                             respect to Licensed Product(s) sold or  transferred
                             prior to any termination and on which consideration
                             has been paid or is  payable by Protatek to PENN as
                             provided in Articles 4 and 8 hereof;

                   9.1.5.    Any  cause of  action  or  claim  of  either  party
                             hereto,  accrued or to accrue because of any breach
                             or default by the other party; and

                   9.1.6. The provisions of Article 7.

              9.2. If Protatek shall at any time default in the payment of any
                   consideration or in the making of any report hereunder, or 
                   shall commit any material breach of any covenant herein 
                   contained, or shall make any materially false report
                   and shall fail to remedy any such default, breach, or report
                   within ninety (90) days after written notice thereof by 
                   PENN, PENN may, at its option, Terminate this License 
                   Agreement and the licenses herein granted by notice
                   in writing to such effect.

              9.3. Protatek shall have the right to Terminate this License 
                   Agreement in respect to any or all Licensed Patents, upon 
                   giving at least written notice to PENN of its intention and
                   desire to terminate.

         Article 10. Assignment
              This  Agreement shall  be binding  upon and  enure to  the parties
              hereto, their successors and asignees, provided, however, that any
              such assignment by  Protatek will require the  written approval of
              PENN. Such approval by  PENN will not  be withheld by PENN  except
              for reason of situations which  might jeopardize the policies, the
              good name of PENN, or its mission.

         Article 11. Applicable Law
              This  License  Agreement  shall  be  construed,  interpreted,  and
              applied  in  accordance  with  the  laws of  the  Commonwealth  of
              Pennsylvania.

                                      6
<PAGE>
         Article 12. Arbitration
              12.1.     Any controversy arising under or related to this License
                        Agreement,  and  any  disputed  claim  by  either  party
                        against   the  other   under  this   License  Agreement,
                        including,  without  limitation,  disputes  relating  to
                        patent  validity  or  infringement shall  be  settled by
                        arbitration,  upon  the  request   of  either  party  in
                        accordance with  the then-prevailing  Patent Arbitration
                        Rules of the American Arbitration  Association (AAA). In
                        the  event  of  such controversy,  the  matter  shall be
                        submitted to one arbitrator knowledgeable in the  field,
                        who has been selected by mutual agreement of the parties
                        hereto or by the AAA if the parties cannot agree.

              12.2.     Any  arbitration under  Paragraph 13.1  hereof shall  be
                        held at Philadelphia, Pennsylvania, or  such other place
                        as may  be mutually agreed  upon in writing  between the
                        parties.  Judgment  upon  the  award  rendered  by   the
                        arbitrator  may   be  entered   in   any  court   having
                        jurisdiction thereof.

         Article 13. Notices

              13.1.     All  notices, demands, or other writings provided for in
                        this  Agreement to  be given,  made, or  sent by  either
                        party to the  other, shall be deemed to  have been fully
                        given, made, or  sent when done in writing and deposited
                        in the United States mail, first class, postage prepaid,
                        and addressed as follows:

                    To PENN:   University of Pennsylvania
                               Office of Research Administration
                               133 South 36th Street
                               Suite 300
                               Philadelphia, Pennsylvania 19104-3246

                        Attention: Associate Director

                   To Protatek: President
                               Protatek International, Inc.
                               1425 Energy Park Drive 
                               Minneapolis, MN 55108

              13.2.  The address to which any notice, demand, or other writing
         may be given or made or sent to any party may be changed upon written
         notice given by such party as above provided.

         Article 14. Waiver

              The parties  covenant and  agree that, if  either party  hereunder
              fails or neglects for any reason  to take advantage of any of  the
              terms of this  License Agreement providing  For the Termination  o
              this License Agreement, or if a party, having the
                                            7
<PAGE>
              right to declare this License Agreement terminated,  shall fail to
              do so,  any such failure or neglect by such  party shall not be or
              be  deemed or be  construed to  be a waiver  of any of  the terms,
              covenants, or  conditions  of this  License  Agreement or  of  the
              performance  thereof. None of the terms, covenants, and conditions
              of  this License  Agreement can  be waived  except by  the written
              consent of the party waiving compliance.

         Article 15. Scope of the Agreement and Integration

              15.1.     The article headings herein are for convenience only and
                        in no manner  affect the rights  and obligations of  the
                        parties,  nor  shall  they  be  used  to  interpret  the
                        provisions hereof.

              15.2.     This   License   Agreement  and   the   above-identified
                        Cooperative  Research  Agreement constitute  the  entire
                        agreement between the parties pertaining to the  subject
                        matter hereof.

             IN WITNESS WHEREOF, the  parties hereto have executed  this License
         Agreement in duplicate  originals by their officers  or representatives
         duly authorized as of the date executed.

      The Trustees of The University            For Protatek International, Inc
             of Pennsylvania 

        /s/                                     /s/ George C. Sambeck
        -----------------------------           -------------------------
               Signed                           Signed 

        President                               Assoc. Dir.
        -----------------------------           -------------------------
               Title                             Title
                                                9/21/88
        -----------------------------           -------------------------
               Date                              Date

                                    8
<PAGE>
         Attachment D: Protatek-PIRC-Penn Assignment Agreement
                             of 9/6/91
<PAGE>
                       PI Research Corporation 
                       Assignment Agreement
                       --------------------
             THIS AGREEMENT is entered into as of September 6, 1991, between PI
         Research Corporation, a Delaware Corporation having a place of business
         at One Bush Street, San Francisco, California 94104 (hereinafter
         referred to as the "Company"), Protatek International, Inc., a
         Minnesota corporation, having a place of business at 1491 Energy Park
         Drive, St. Paul, Minnesota 55108 (hereinafter referred to as
         "Protatek"), the Trustees of the University of Pennsylvania, with
         offices at 133 South 36th Street, Philadelphia, Pennsylvania 19104
         (hereinafter referred to as the "University").
             WHEREAS, the Company desires to acquire certain rights to
         technology currently held by Protatek by virtue of certain research and
         license agreements that have previously been entered into with the
         University; and
             WHEREAS, Protatek is willing to assign its rights under such
         research and license agreements to the Company in exchange for equity
         in the Company; and
             WHEREAS, the University desires to consent to such assignment in
         exchange for equity in the Company;
             NOW THEREFORE, for and in consideration of the mutual covenants and
         obligations assumed by the parties hereto, it is agreed as follows:
              1. Assignment
                 ----------
             Effective as of the date of this Agreement, Protatek hereby assigns
         to the Company all right, title and interest that Protatek holds as a
         party to the following research and license agreements (collectively,
         the Assigned Agreements"):
             A.    Cooperative Research Agreement between the University and
         Protatek dated August 1, 1988;
             B.    License Agreement between the University and Protatek dated
         September 27, 1988, for C1 Esterase Inhibitor; and
<PAGE>
                    C.    License Agreement between the University and
                                                                -
         Protatek dated September 27, 1988, for alpha-1 Antichymotrypsin.
             This assignment by Protatek includes the assignment of any and all
         rights that Protatek may have to any discoveries, technology or
         inventions related to the subject matter of the Assigned Agreements,
         including any and all technology derived during the performance of
         Protatek's obligations under the Assigned Agreements.
              2. Consideration.

             A. To Protatek. In exchange for the foregoing assignment, the
         Company will issue to Protatek an aggregate of 1,098,039 shares of the
         Company's Common Stock which shares will initially represent twenty-
         eight percent (28%) of the total capital stock of the Company
         outstanding or reserved for initial issuance. Such Common Stock will be
         issued pursuant to a separate Stock Purchase Agreement in customary
         form to be executed by the parties as soon as reasonably possible, and
         certificates representing such shares of Common Stock will be delivered
         to Protatek promptly after the execution of such Stock Purchase
         Agreement.

             B.    To the University and Certain University Faculty. In exchange
         for its consent to the foregoing assignment, the Company will issue to
         the University and provide an opportunity to purchase for certain
         faculty of the University, an aggregate shares shall of the Company's
         Common Stock, which shares will initially represent of the total
         capital stock of the Company outstanding or reserved for initial
         issuance. Specifically, the aforesaid aggregate shares shall be
         distributed directly to the University and certain faculty of the
         University as follows:

                   1.    To the University,  shares, comprising
             the total capital stock of  the Company outstanding or reserved for
         initial issuance;

             2.    To Dr. Harvey Rubin, Assistant Professor of Medicine, the
         opportunity to purchase shares, comprising of the total capital
         stock of the Company outstanding or reserved for initial issuance;

             3.    To Dr. Barry Cooperman, Professor of Chemistry, the
         opportunity to purchase shares shall, comprising            the
         total capital stock of the Company outstanding or reserved for initial
         issuance;

                                          2
<PAGE>
                   4.    To Dr. Norman Schechter, Research Professor
         of Dermatology, the opportunity to purchase shares
         comprising                     of the total
                           ---------
         capital stock of the Company outstanding or reserved for initial
         issuance; and

             5.    To Dr. Zhai-Mei Wang, Research Associate for Infectious
         Diseases, the opportunity to purchase shares comprising total
         capital stock of the Company outstanding or reserved for initial 
         issuance.

         Such Common Stock will be issued pursuant to separate Stock Purchase
         Agreements in customary form to be executed by the parties as soon as
         reasonably possible, and certificates representing such shares of
         Common Stock or the opportunity to purchase such Common Stock will be
         delivered to the University and the faculty identified above,
         respectively, promptly after the execution of such Stock Purchase
         Agreements.

             In further consideration to the University, Company and
        University agree to renegotiate in good faith a revised License 
        Agreement for alpha-1 Antichotrypsin and C-1 Esterase Inhibitor to 
        substitute for the Agreements referenced in Paragraphs 1.B and 1.C, 
        and a Collaborative Research Agreement to substitute for the 
        agreement referenced in Paragraph 1.A.

             Protatek and the UniVersity hereby agree to execute such documents
         as are reasonably necessary in the opinion of counsel to the Company to
         permit the Company lawfully to convey the appropriate equity of the
         Company to Protatek and the University, respectively. Protatek and the
         University acknowledge and agree that the shares o~ Colon Stock issued
         to them will be subject to substantial restrictions on transfer and are
         being acquired solely for investment purposes.

              3.    Acceptance and Consent of Assiqnments.
                    -------------------------------------

             The Company hereby accepts the foregoing assignment by Protatek and
         agrees to be bound to all of the provisions therein and to convey the
         consideration described above to each party. The University hereby
         consents to the assignment of the Assigned Agreement to the Company,
         including any rights that may have arisen during the course of
         Protatek's performance under the Assigned Agreements.

              4.    Miscellaneous Provisions.
                    ------------------------

             This Agreement shall be governed for all purposes by the law of the
         State of Delaware as it applies to contracts

                                    3
<PAGE>
         between Delaware residents, made and to be performed entirely within
         the State of Delaware.

             IN WITNESS WHEREOF, the parties hereto have executed this Agreement
         as of the day and year first above written.

         PI RESEARCH CORPORATION        PROT~~NTE~A~ONAL, INC. A .              
               

          /s/ Robert J. Runze         /s/ Roger Headrick
         ------------------------    ----------------------------
         Robert J.Kunze,President    Roger Headrick, President




         THE TRUSTEES OF THE UNIVERSITY
         OF PENNSYLVANIA


         /s/  Stephen M. Sammut
         -----------------------------
         Stephen M. Sammut, Director
         Center for Transfer Technology



                                   4



<PAGE>
                 Attachment F: PIRC/Penn Collaborative Research Agreement
                                           of 3/1/91
<PAGE>
                                     Signature Version

                             COLLABORATIVE RESEARCH AGREEMENT
                             --------------------------------

              This COLIABORATIVE RESEARCH AGREEMENT is made as of the First day
          of March, 1991 by and between THE TRUSTEES OF THE UNIVERSITY OF
          PENNSYLVANIA, a nonprofit corporation organized and existing under the
          laws of the Commonwealth of Pennsylvania (the "University"), and PI
          Research Corporation, a corporation organized and existing under the
          laws of Delaware ("Sponsor").

                                         RECITALS
                                         --------

              A. Dr. Harvey Rubin, a faculty member and Assistant Professor of
          Medicine of the University, has performed research in the field of
          human protease inhibitors under a cooperative research agreement,
          dated October 1, 1987, with Protatek International, Inc.("Protatek"),
          a company then based in Minneapolis, MN.

              B. University entered into two license agreements with University
          for inventions made under the cooperative research agreement.

              C. Protatek contemplates assigning its rights under the
          cooperative research agreement and the two license agreements to
          Sponsor.

              D.  University and Sponsor contemplate entering into a revised
          license agreement ("License Agreement"), which will replace the two
          previous license agreements referred to in recital C above.

              E. Sponsor has undertaken and fulfilled the obligations of
          Protatek to University under the October 1, 1987 Cooperative Research
          Agreement, which has terminated.

              F. Sponsor desires to support and collaborate on additional
          research with Dr. Rubin, such research to be performed in accordance
          with the terms and conditions of this Agreement.

              G. Sponsor further desires to obtain an option to license certain
          of the results of the research performed collaboratively under this
          Agreement on terms substantially similar to those contained in the
          License Agreement.

              H. The research and development program contemplated by this
          Agreement is of mutual interest to Sponsor and the University and
          furthers the educational, scholarship and research objectives of the
          University as a nonprofit, tax-exempt educational institution.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              2

              NOW, THEREFORE, in consideration of the premises and mutual
          covenants contained herein, and intending to be legally bound hereby,
          the parties hereto agree as follows:

                                  ARTICLE 1: DEFINITIONS

              1.1 The following terms as used herein shall have the following
          meanings:

          1.1.1 "Confidential Information, means (i) the University Inventions,
                -------------------------
          (ii) the Joint Inventions, (iii) Sponsor Inventions, (iv) any
          information or material in tangible form that is marked as
          confidential or proprietary by the furnishing party at the time it is
          delivered to the receiving party, and (v) information that is
          furnished orally if the furnishing party identifies such information
          as confidential or proprietary when it is disclosed and promptly
          confirms such designation in writing within 30 days after such
          disclosure.

              1.1.2 "Collaborative Research" means the research and development
                    -----------------------
          program related to human protease inhibitors, as more fully described
          in Attachment 1 to this Agreement, as such may be modified by mutual
          agreement of the parties in writing.

              1.1.3 "Effective Date" of this Agreement is March 1, 1991.
                      ---------------

              1.1.4 "Inventions" mean and include all technical information,
                    -----------
          trade secrets, developments, discoveries, know-how, methods,
          techniques, formulae, processes and other proprietary ideas, whether
          or not patentable or copyrightable, that are discovered, developed or
          reduced to practice in the performance of the Collaborative Research.

              1.1.5 "Joint Inventions" mean Inventions made or conceived jointly
                    -----------------
          by employees of the University and Sponsor.

              1.1.6 "Principal Investigators" mean the individuals designated in
                    ------------------------
          accordance with Section 92.3 hereof.

              1.1.7 "Research Inventions" mean the Joint Inventions, Sponsor
                     -------------------
          Inventions and University Inventions.

              1.1.8 "Sponsor Inventions" mean Inventions made or conceived
                     ------------------
               solely by employees of Sponsor.

              1.1.9 "University Inventions" mean Inventions made or
                    ----------------------
               conceived solely by employees of the University.

                   1.1.10 ~University Principal Investigator" or "University
                          ---------------------------------     -----------
               Investigators" refers respectively to the Principal Investigator,
               -------------
               Harvey Rubin, M.D., Ph.D., Assistant Professor of Medicine at
               University, and to Investigators, Barry S. Cooperman, Ph.D.,
               Professor of Chemistry, Norman Schechter, Ph.D., Research
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              3

          Professor of Dermatology and Zai-Mei Wang, Ph.D., Research Associate
          Infectious Diseases, all at University.

                               ARTICLE 2: SPONSORED RESEARCH

              2.1 Statement of Work. The parties hereto agree to use reasonable
                  -----------------
          efforts to conduct the Collaborative Research with funds made
          available by Sponsor. Each party shall furnish the appropriate
          personnel, materials, services, facilities and equipment for the
          performance of the Collaborative Research. The University is under no
          obligation to fund any of the Collaborative Research.

              2.2 Conduct and Supervision of Collaborative Research. The parties
                  -------------------------------------------------
          shall cooperate fully in the conduct and supervision of the
          Collaborative Research. Each party acknowledges that the other makes
          no express or implied warranties, representations or guarantees with
          respect to the completion, success or particular results of the
          Collaborative Research.

               2.3 Participation of Principal Investigators.
                   ----------------------------------------

              2.3.1 Dr. Harvey Rubin, an employee of University, and an employee
          of Sponsor to be designated in the future who shall be acceptable to
          University, shall serve as Principal Investigators for the
          Collaborative Research and shall be responsible for the administration
          and supervision of the Collaborative Research. The Principal
          Investigators shall meet at reasonable intervals, in mutually
          convenient locations to review the findings and the progress of the
          Collaborative Research.

              2.3.2 If the services of a Principal Investigator become
          unavailable to a party for any reason, that party shall be entitled to
          designate another member of its staff or faculty who is acceptable to
          both parties to serve as a Principal Investigator of the Collaborative
          Research. If a substitute Principal Investigator has not been
          designated within sixty (60) days after an original Principal
          Investigator ceases his or her services under this Agreement, either
          party may terminate this Agreement upon written notice thereof to the
          other party.

               2.4 Access to Facilities
                   --------------------

              Each party shall permit visits and inspections to its facilities,
          and observation of the work being performed in connection with the
          Collaborative Research program, by the employees and consultants of
          the other parties engaged in the performance of Collaborative
          Research. All such visiting personnel shall be subject to the health
          and safety regulations of the facility in question, and to the
          execution of appropriate agreements regarding non-disclosure of
          Confidential Information.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              4

                             ARTICLE 3: PERIOD OF PERFORMANCE

              3.1 Period of Performance. The initial term of the Collaborative
                  ---------------------
          Research shall be for           from the Effective Date of this
          Agreement, unless terminated sooner pursuant to Section 7.1
          hereof. This Agreement may be extended or renewed only by written
          agreement of both parties.

                                 ARTICLE 4: FUNDING, ETC.

              4.1 Funding. To support the Collaborative Research of the
                  -------
          University, Sponsor shall pay the University the amounts set forth in
          Attachment 1 hereto for the initial term of the Collaborative 
          Research. Funding amounts for any renewal term shall be determined by
          the parties if and when the determination to renew is made under 
          Article 3 hereof.

              4.2 Payment. Sponsor shall make monthly payments on a pro rata
                  -------
          basis in accordance with Attachment 1 by check made payable to "The
          Trustees of the University of Pennsylvania," mailed to the University
          at the address identified in Section 9.5 hereof.

              4.3 Additional Funds. The total of the payments set forth in
                  ----------------
          Attachment A (the "Payment Ceiling") represents an estimate only and
          not a guarantee of the cost to support the University's research
          Activities during the initial term of the Collaborative Research. The
          University may submit a request to Sponsor for additional funds at
          such time as the University's share of the Collaborative Research
          costs may reasonably be projected to exceed the Payment Ceiling.
          Sponsor shall not be liable for, and the University shall not incur,
          expenditures in excess of the Payment Ceiling unless Sponsor approves
          such additional expenditure in writing and funds such additional
          expenditure in advance. The University shall not be required to
          complete the Collaborative Research in the event that (i) the Payment
          Ceiling proves insufficient for that purpose, and (ii) Sponsor
          determines not to increase the Payment Ceiling to an amount adequate
          to complete the Collaborative Research. Any amounts paid by Sponsor
          under this Agreement are nonrefundable, except as provided in Section
          7.2 hereof. Payments made by Sponsor under this Section fulfill the
          diligence obligations of the Licenses under Section3.3(a) of the
          License Agreement.

              4.4 University Record Keeping and Reports to Sponsor. The
                  ------------------------------------------------
          University shall keep accurate records and books of account relating
          to amounts paid to it by Sponsor hereunder, which are to be available
          to authorized representatives of Sponsor upon reasonable written
          notice during the University's regular business hours. The parties
          shall consult and render progress reports to one another quarterly
          during the term of the Collaborative Research and shall render to one
          another a complete final report on the results of the Collaborative
          Research within
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              5

          one hundred twenty (120) days following termination of the
          Collaborative Research.

              4.5 Equipment. Title to any equipment purchased, built or
                  ---------
          manufactured by the University, its Principal Investigator or
          University Investigators in the performance of the Collaborative
          Research shall vest in the University and any such equipment shall be
          and remain the property of the University following termination of the
          Collaborative Research.

                      ARTICLE 5: INVENTIONS, OPTION TO LICENSE, ETC.

              5.1 Disclosure of Inventions. Each party shall provide promptly to
                  ------------------------
          the other a complete written disclosure of any Research Invention
          reasonably considered patentable.

               5.2 Prosecution of Patents.
                   ----------------------

              5.2.1 University Inventions. The University shall be responsible
                    ---------------------
          for and shall control the preparation, prosecution and maintenance of
          all patents and patent applications related to a University Invention.
          Sponsor shall advise the University, no later than thirty (30) days
          after receipt of disclosure of a University Invention whether it
          requests the University to file and prosecute a patent application
          related to such University Invention. Sponsor shall reimburse the
          University for all documented expenses (including legal fees, filing
          and maintenance fees or other governmental charges) incurred in
          connection with the filing, prosecution and maintenance of any patents
          and patent applications that Sponsor requests the University to
          prosecute hereunder. Sponsor and the University shall mutually
          determine the countries where the patents and patent applications
          related to University Inventions will be prosecuted and maintained. If
          Sponsor declines to pay for filing, prosecution and maintenance costs
          in any jurisdiction, the University may do so at its cost and expense
          but such patents and patent applications shall be excluded from
          Sponsor's option to license under Section 5.4 hereof. If the
          University elects not to file, prosecute or maintain any patent or
          patent application related to a University Invention, Sponsor shall
          then have the right to file, prosecute or maintain the patent or
          patent application at its own expense.

              5.2.2 Joint Inventions and Sponsor Inventions. Sponsor shall be
                    ---------------------------------------
          responsible for and shall control, at its own cost, the preparation,
          prosecution and maintenance of all patents and patent applications
          related to a Joint Invention or a Sponsor Invention. Sponsor shall
          advise the University no later than thirty (30) days after disclosure
          of a Joint Invention by either party whether it intends to file and
          prosecute a patent application related to the Joint Invention. If
          Sponsor declines to file and prosecute a patent application for a
          Joint Invention in any jurisdiction, the University may do so at its
          cost and expense but such patent application and patent shall be
          excluded
<PAGE>
          Collaborative Research Agreement between PIRC and Penn             6

          from Sponsor's option to license under Section 5.4 hereof.

              5.2.3 Other Proprietary Rights. The filing and prosecution of
                    ------------------------
          copyright, trademark and other intellectual property protection
          related to the Research Inventions shall be subject to the provisions
          of this Section 5.2.

              5.2.4 Cooperation. Each party shall cooperate with the other party
                    -----------
          to execute all lawful papers and instruments and to make all rightful
          oaths and declarations as may be necessary in the preparation and
          prosecution of all patents and other filings referred to in this
          Article 5.

               5.3 Ownership.
                   ---------

              (a) The University shall retain all right, title and interest in
          and to the University Inventions and any patent applications, patents,
          copyrights and other protection related thereto, regardless of which
          party prepares, prosecutes or maintains the patent applications,
          patents, copyrights or other protection related to the University
          Inventions.

              (b) Sponsor shall retain all right, title and interest in and to
          the Sponsor Inventions and any patent applications, patents,
          copyrights and other protection related thereto.

              (c) Sponsor and the University shall retain all right, title and
          interest in and to the Joint Inventions and each shall have an equal
          undivided partial interest in any such Joint Invention and any
          resulting patent applications, patents, copyrights and other
          protection issued or granted thereon, regardless of which party
          prepares, prosecutes or maintains the patent applications, patents,
          copyrights or other protection related to the Joint Inventions.

              (d) Each party shall maintain policies for its employees or
          agreements with all of its employees assigned to conduct Collaborative
          Research, and all third party contractors engaged in connection with
          the Collaborative Research project, providing for the assignment to
          such party of all rights of such employee, consultant, or contractor
          with respect to inventions made or other technology rights developed
          in the course of such person's employment or other engagement by the
          party which relate to the Collaborative Research.

              5.4 Option to License. In consideration of Sponsor's funding of
                  -----------------
          the Collaborative Research, Sponsor shall have the option to acquire
          an exclusive, worldwide, royalty-bearing license to practice any
          University Invention or Joint Invention and any patents or patent
          applications related thereto and to make, have made, use and sell
          products using or incorporating a University Invention or Joint
          Invention pursuant to the terms of the License Agreement, as
          supplemented or amended by the provisions of Attachment 2 hereto.
          Sponsor's option must be
<PAGE>
          Collaborative Research Agreement between PIRC and Penn             7

          exercised by written notice to the University within three months
          after the disclosure of a University Invention or Joint Invention to
          Sponsor under Section 5.1 hereof. If Sponsor timely exercises its
          option, Sponsor and the University will promptly execute an amendment
          to the License Agreement as to each University Invention or Joint
          Invention for which the Sponsor has exercised its option. If Sponsor
          fails to timely exercise its option, or if Sponsor and the University
          fail to execute an amendment to the License Agreement within nine (9)
          months after disclosure of the University Invention or Joint Invention
          to Sponsor, the University shall be free to license the University
          Invention or Joint Invention to any party upon such terms as the
          University deems appropriate, without any further obligation to
          Sponsor.

              5.5 Retained Rights of U.S. Government. Any license granted to
                  ----------------------------------
          Sponsor pursuant to Section hereof shall be subject to the rights of
          the United States government reserved under Public Laws 96-517, 97-
          256, and 98-620, codified at 35 U.S.C. 200-212, and any regulations
          issued thereunder.

              5.6 Grant of License to Sponsor Technology. Sponsor hereby grants
                  --------------------------------------
          to the University a license, without right of sublicense, to use, but
          not to make, have made or sell and solely for the limited purpose of
          engaging in the Collaborative Research, any trade secrets,
          information, know-how or other proprietary ideas obtained or 
          developed by Sponsor outside of the performance of the Collaborative 
          Research that Sponsor, solely in its discretion, discloses to the 
          University for the purpose of assisting the University in performing 
          the Collaborative Research.

                        ARTICLE 6: CONFIDENTIALITY AND PUBLICATION

              6.1    Confidentiality. Sponsor shall maintain in confidence and
                     ---------------
          shall not disclose to any third party the Confidential Information of
          the University received pursuant to this Agreement, without the prior
          written consent of the University. The foregoing obligation shall not
          apply to:

                         6.1.1.1  information  that  is   known  to  Sponsor  or
                         independently developed by Sponsor prior to the time 
                         of disclosure, in each case, to the extent evidenced by
                         written records promptly disclosed to the University 
                         upon receipt of the Confidential Information;

                         6.1.1.2    information disclosed to Sponsor by a third
                         party that has a right to make such disclosure;
<PAGE>
          Co11aborative Research Agreement between PIRC and Penn              8

                         6.1.1.3    information that becomes patented, published
                         or otherwise part of the public domain as a result of
                         acts by the University or a third person obtaining such
                         information as a matter of right; or

                         6.1.1.4    information that is required to be disclosed
                         by order of the U.S. Food and Drug Administration or
                         similar authority or a court of competent jurisdiction;
                         provided that the parties shall use their best efforts
                         to obtain confidential treatment of such information by
                         the agency or court.

              6.1.2. Sponsor will take all reasonable steps to protect the
          Confidential Information of the University with the same degree of
          care Sponsor uses to protect its own confidential or proprietary
          information. Without limiting the foregoing. Sponsor shall ensure that
          all of its employees having access to the Confidential Information of
          the University are obligated to abide by Sponsor's obligations
          hereunder.

              6.1.3. The University shall not be obligated to accept any
          Confidential Information of Sponsor. If Sponsor desires to furnish any
          such Confidential Information to the Principal Investigator or other
          University personnel, Sponsor may request such individual to sign a
          confidentiality agreement with Sponsor in the form of Attachment 3
          hereto. The University bears no institutional responsibility for
          maintaining the confidentiality of any Confidential Information of
          Sponsor.

               6.2 Publication.
                   -----------

              6.2.1. Sponsor acknowledges that the basic objective of research
          and development activities at the University is the generation of new
          knowledge and its expeditious dissemination. To further that
          objective, the University retains the right, at its discretion, to
          demonstrate, publish or publicize a description of the results of the
          Collaborative Research or any University Invention or Joint Invention,
          subject to the provisions below.

              6.2.2. Should the University desire to disclose publicly, in
          writing or by oral presentation, the results of the Collaborative
          Research or any University Invention or Joint Invention for which a
          patent application has not been filed, the University shall notify
          Sponsor in writing of its intention at least thirty (30) days before
          submission of such material that
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              9

          would make such disclosure. The University shall include with such
          notice a description of the oral presentation or, in the case of a
          manuscript or other proposed written disclosure, a current draft of
          such written disclosure.

              6.2.3. With respect to University Inventions, Sponsor may request
          the University, no later than thirty (30) days following the receipt
          of the University's notice, to file a patent application, copyright or
          other filing related to such University Invention. All such filings
          shall be subject to the provisions of Section 5.2 of this Agreement.
          Upon receipt of such request, the University shall arrange for a short
          delay in publication, not to exceed sixty (60) days, to permit filing
          of a patent or other application by the University, or if the
          University declines to file such application, to permit Sponsor to
          make such a filing. If University receives no such request from
          Licensee to delay submission of material making such disclosure,
          University may submit such material for publication or presentation
          provided that University first confirms in a reasonable way that
          Licensee has received and reviewed material.

              6.2.4. With respect to a Joint Invention, Sponsor may request the
          University, no later than thirty (30) days following the receipt of
          the University's notice, to delay publication for a period not to
          exceed sixty (60) days to permit filing of a patent or other
          application by the Sponsor. All such filings shall be subject to the
          provisions of Section 5.2 of this Agreement.

              6.2.5. If the University desires to demonstrate, publish or
          publicize the results of the Collaborative Research or any University
          Invention of Joint Invention that is not patentable, and Sponsor
          objects to such proposed disclosure within the time period specified
          in Sections 6.2.3 or 6.2.4 above, the parties will negotiate in good
          faith to determine whether the proposed disclosure can be modified or
          withheld, consistent with the objectives of each party. In no event
          shall the University be prohibited from proceeding with any such
          publication.

              6.3. Use of Name. Neither party hereto shall directly or
                   -----------
          indirectly use the name of the other party, or the name of any
          trustee, director, officer or employee thereof, without the others
          written consent.

                                  ARTICLE 7: TERMINATION

               7.1 Termination.
                   -----------

              7.1.1 In addition to the termination right set forth in Section
          2.3.2 hereof, either party may terminate this Agreement effective upon
          written notice to the other party, if the other party breaches the
          terms of this Agreement and fails to cure Such breach within days
          after receiving notice
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              10

          thereof.

              7.1.2 This Agreement shall automatically terminate if Sponsor
          becomes insolvent or voluntary or involuntary proceedings by or
          against Sponsor are instituted in bankruptcy or under any insolvency
          law, or a receiver or custodian is appointed for Sponsor, or
          proceedings are instituted by or against Sponsor for corporate
          reorganization or the dissolution of Sponsor, which proceeding, if 
          involuntary, shall not have been dismissed within the date of filing 
          or Sponsor makes an assignment for benefit of creditors, or 
          substantially all of the assets of Sponsor are seized or attached and
          not released within  thereafter.

              7.1.3 In addition, either party may terminate this Agreement for
          any reason upon prior written notice to the other party.

              7.2. Effect of Termination. In the event of termination of this
                   ---------------------
          Agreement prior to its stated term whether for breach or for any other
          reason whatsoever, the University shall be entitled to retain from the
          payments made by Sponsor prior to termination the University's
          reasonable costs of concluding the work in progress. Allowable costs
          include, without limitation, all costs or noncancellable commitments
          incurred prior to the receipt of, or issuance by, the University of
          the notice of termination, and the full cost of each student and
          faculty member supported hereunder through the end of the academic
          semester in which the effective date of termination fails. In the
          event of termination, the University shall submit a final report of
          all costs incurred and all funds received under this Agreement within
          sixty (60) days after the effective termination date. The report shall
          be accompanied by a check in the amount of any excess of funds
          advanced over costs and allowable commitments incurred.

              7.3. Survival. Termination of this Agreement shall not affect the
                   --------
          rights and obligations of the parties accrued prior to termination
          hereof. The provisions of Articles 5, 6, 8 and 9 shall survive such
          termination.

                               ARTICLE 8: DISCLAIMERS, ETC.

              8.1. No Warranties. THE UNIVERSITY MAKES NO WARRANTIES, EXPRESS OR
                   -------------
          IMPLIED, AS TO ANY MATTER WHATSOEVER, INCLUDING, WITHOUT LIMITATION,
          THE CONDUCT OF THE COLLABORATIVE RESEARCH, OR THE CONDITION OF ANY
          INVENTION(S) OR PRODUCT(S), WHETHER TANGIBLE OR INTANGIBLE, CONCEIVED,
          DISCOVERED, OR DEVELOPED UNDER THIS AGREEMENT, OR THE OWNERSHIP,
          MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE OF THE
          COLLABORATIVE RESEARCH OR ANY SUCH INVENTION OR PRODUCT. THE
          UNIVERSITY SHALL NOT BE LIABLE FOR ANY DIRECT, CONSEQUENTIAL, PUNITIVE
          OR OTHER DAMAGES SUFFERED BY SPONSOR OR ANY OTHER PERSON RESULTING
          FROM THE COLLABORATIVE RESEARCH OR THE USE OF ANY SUCH INVENTION OR
          PRODUCT.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              11

              8.2 Indemnity.  The indemnification or reimbursement rights and
                  ---------
          obligations of the parties hereto shall be governed by Sections 6.2
          and 6.3 of the License Agreement.

                                  ARTICLE 9: ADDITIONAL PROVISIONS

               9.1 Arbitration.
                   -----------

              9.1.1 Except as provided in Section 6.4 hereof, all disputes
          arising between the University and Sponsor under this Agreement shall
          be settled by arbitration conducted in the English language in
          accordance with the Commercial Arbitration Rules of the American
          Arbitration Association relating to voluntary arbitrations with a
          panel of three (3) arbitrators. The parties will cooperate with each
          other in causing the arbitration to be held in as efficient and
          expeditious a manner as practicable. Any arbitration proceeding
          instituted under this Agreement shall be brought in Philadelphia,
          Pennsylvania.

              9.1.2 Any award rendered by the arbitrators shall be final and
          binding upon the parties hereto. Judgment upon the award maybe entered
          in any court of record of competent jurisdiction. Each party shall pay
          its own expenses of arbitration and the expenses of the arbitrators
          shall be equally shared unless the arbitrators assess as part of their
          award all or any part of the arbitration expenses of one party
          (including reasonable attorneys' fees) against the other party.

              9.9- Assignment. No rights hereunder may be assigned by Sponsor,
                   ----------
          directly, unless by merger or acquisition of Sponsor, without the
          express written consent of the University; provided, however, that
          Sponsor may assign the same to an Affiliate that assumes all
          obligations of Sponsor under this Agreement or to any entity in
          connection with any merger, acquisition or sale of all or
          substantially all of its business related to this Agreement. Any
          prohibited assignment of this Agreement on the rights hereunder shall
          be null and void. No assignment shall relieve Sponsor of
          responsibility for the performance of any accrued obligations which it
          has prior to such assignment, unless the 'University consents in
          writing to release of such accrued obligations. This Agreement shall
          inure to the benefit of permitted assigns of Sponsor.

              9.3 No Waiver. A waiver by either party of a breach or violation
                  ---------
          of any provision of this Agreement will not constitute or be construed
          as a waiver of any subsequent breach or violation of that provision or
          a waiver of any breach or violation of any other provision of this
          Agreement.

              9.4 Independent Contractor. Nothing herein shall be deemed to
                  ----------------------
          establish relationship of principal and agent between the University
          and Sponsor, nor any of their agents or employees for any purpose
          whatsoever. This Agreement shall not be construed as
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              12

          constituting the University and Sponsor as partners, or as creating
          any other form of legal association or arrangement which would impose
          liability upon one party for the act or failure to act of the other
          party.

              9.5 Notices. Any notice under this Agreement shall be sufficiently
                  -------
          given if-sent in writing by prepaid first class, certified or
          registered mail, return receipt requested, addressed as follows:

               If to the University:

                    Center for Technology Transfer 
                    University of Pennsylvania
                    133 South 36th Street 
                    Philadelphia, PA 19104
                    Attn: Director

               cc: Office of the General Counsel 
                   110 College Hall 
                   University of Pennsylvania 
                   Philadelphia, PA 19104
                   Attn: General Counsel

               cc: Dr. Harvey Rubin 
                   Assistant Professor 
                   Department of Medicine
                   Hospital of the University of Pennsylvania 
                   3400 Spruce Street 
                   Philadelphia, Pa 19104

          If to Sponsor:

                    P I Research Corporation 
                    c/o Mr. Robert Kunze
                    Hambrecht & Quist Life Science Venture Partners 
                    One Bush Street
                    San Francisco, CA 94101
                    Attn:  Chief Executive Officer

          with copy to:
                    Hambrecht & Quist Life Science
                        Venture Partners 
                    One Bush Street
                    San Francisco, CA 94104
                    Attn:   Mr. Robert Kunze

          with copy to:
                    Cooley Godward Castro Huddleson & Tatum 
                    One Maritime Plaza, 20th Floor 
                    San Francisco, CA 94111
                    Attn:  Kenneth L. Guernsey, Esq.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              13

              9.6 Entire Agreement; Changes. This Agreement embodies the entire
                  -------------------------
          understanding between the parties relating to the subject matter
          hereof and supersedes all prior understandings and agreements, whether
          written or oral. This Agreement may not be varied except by a written
          document signed by duly authorized representatives of both parties.

              9.7 Severability. Any of the provisions of this Agreement which
                  ------------
          are determined to be invalid or unenforceable in any jurisdiction
          shall be ineffective to the extent of such invalidity or
          unenforceability in such jurisdiction, without rendering invalid or
          unenforceable the remaining provisions hereof or affecting the
          validity or unenforceability of any of the terms of this Agreement in
          any other jurisdiction.

              9.8 Headings. The headings and captions used in this Agreement are
                  --------
          for convenience of reference only and shall not affect its
          constructions or interpretation.

              9.9 No Third Party Benefits. Nothing in this Agreement, express or
                  -----------------------
          implied, is intended to confer on any person other than the parties of
          their permitted assigns, any benefits, rights or remedies.

              9.10 Governing Law. This Agreement shall be construed and governed
                   -------------
          in accordance with the laws of the State of Delaware, without giving
          effect to conflict of law provisions.

              9.11 Counterparts. This Agreement shall become binding when any
                   ------------
          one or more counterparts hereof, individually or taken together, shall
          bear the signatures of the University and Sponsor. This Agreement may
          be executed in any number of counterparts, each of which shall be
          deemed an original as against the party whose signatures appears
          thereon, but all of which taken together shall constitute but one and
          the same instrument.

              9.12 Independent Research. This Agreement shall not be construed
                   --------------------
          to limit the freedom of individuals participating in the Collaborative
          Research to engage in any other research.

              9.13 Nondiscrimination. The University and Sponsor shall not
                   -----------------
          discriminate against any employee or applicant for employment because
          of race, color, sex, sexual or affectational preference, age,
          religion, national or ethnic origin, or handicap.

              9.14 Force Majeure. Neither party shall be liable for any
                   -------------
          failure to perform as required by this Agreement to the extent
          such failure to perform is due to circumstances reasonably beyond
          such party's control, including, without limitation, labor
          disturbances or labor disputes of any kind, accidents, failure of
          any governmental approval required for full performance, civil
          disorders or commotions, acts of aggression acts of God, energy
          or other conservation measures imposed by law or regulation,
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              14

          explosions, failure  of  utilities,  mechanical  breakdowns,  material
          shortages, disease, or other such occurrences.

              IN WITNESS WHEREOF, the duly authorized representatives of the
          parties hereby execute this Collaborative Research Agreement as of the
          date first above written.

          FOR THE TRUSTEES OF THE        FOR THE SPONSOR
          UNIVERSITY OF PENNSYLVANIA    


          /s/ Stephen M. Sammut          /s/ Robert Kunze 
          --------------------------     --------------------------
             Stephen M. Sammut           Robert Kunze 
            Director, Center for              Chairman
             Technology Transfer

          Agreed to and Acknowledged:


          /s/ Dr. Harvey Rubin           /s/ Dr. Barry Cooperman
          --------------------------     --------------------------
          Dr. Harvey Rubin               Dr. Barry Cooperman
          Principal Investigator.        Investigator


          /s/ Dr. Norman Schechter        /s/ Dr. Zhai-Mei Wang 
          --------------------------     --------------------------
          Dr. Norman Schechter            Dr. Zhai-Mei Wang 
          Investigator                    Investigator
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              15

          Attachment 1

                         Description of the Collaborative Research
                         -----------------------------------------
                                 and Schedule of payments
                                 ------------------------
<PAGE>
          Summary of Proposed Research
<PAGE>
                   Collaborative Research Agreement 
          PI Research Corporation/University of Pennsylvania

        Budget for the period March 1, 1991 to February 29, 1992
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              16

                                       Attachment 2

                          Additional Terms for License Agreement
                          --------------------------------------

              B.            In the event that Sponsor exercises its option
          under Section 5.4 of the Agreement to obtain an exclusive license in
          or to a University Invention or to the University's undivided interest
          in a Joint Invention (collectively, "Additional Licensed Technology")
          that are not included under the definition of Licensed Patents in the 
          License Agreement and/or
          are not related to                                           the
          parties shall execute      a written addendum to the License Agreement
          making Additional Licensed Technology subject to all the terms and
          conditions of the License Agreement with the exception that Minimum
          Royalties for Additional Licensed Technology as otherwise described in
          Paragraph 3.4 of the License Agreement shall be administered according
          to the following schedule:

                     Minimum Royalty          Year Beginning
                     ---------------          --------------

                                              ( ) Anniversary of
                                                  Addendum
                                             Each Anniversary of Addendum
                                                  thereafter

              B. 1.2. University shall not receive an up-front payment or
          additional stock for Additional Licensed Technology. Royalties will be
          paid on Additional Licensed Technology to the extent that such
          Additional Licensed Technologies are incorporated in the sale of
          Licensed Products.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              17

          Attachment 3

              Form of Confidentiality Agreement
          -------------------------------------
<PAGE>
                                 CONFIDENTIALITY AGREEMENT

             (Acceptable Form Under Paragraph 8.1 (c) of License Agreement and
                   Paragraph 6.1.3 of Collaborative Research Agreement)

              This Agreement is by and between ______________________  an
          employee of the University of Pennsylvania ("the University" located
          in Philadelphia, PA 19104 (hereinafter referred to as"Recipient"); and
          PI Research Corporation, a corporation organized and existing under
          the laws of Delaware (hereinafter referred to as "Company").

                                         RECITALS

              WHEREAS, a License Agreement, dated October 1, 1991 and a
          Collaborative Research Agreement dated March 1, 1991 are in place
          between the University and Company in the field of protease inhibitors
          with Recipient serving as an Investigator or other researcher for the
          University; and

              WHEREAS, Company anticipates conducting research in, or working
          with third parties that are conducting research in, the field of
          protease inhibitors, and may develop or have access to a body of
          technical, economic and business information and/or material samples
          (hereinafter collectively referred to as "Information") which Company
          considers proprietary; and

              WHEREAS, in order for Company to conduct research under the
          Collaborative Research Agreement with University, or for Company to
          facilitate the transfer of technology under the License Agreement, it
          may be necessary for Company to disclose to and/or provide Recipient
          with Information; and

              WHEREAS, the University bears no institutional responsibility to
          receive or maintain in confidence such Information, but will allow
          Recipient to enter this Agreement on an individual basis in connection
          with the Collaborative Research Agreement and the License Agreement;
          and

              WHEREAS, Recipient is willing to accept as an individual
          Information from Company under the terms and conditions set forth
          herein in order to conduct the work contemplated by the Collaborative
          Research Agreement and/or participate in the transfer of technology
          from University to Company under the License Agreement (hereinafter
          collectively referred to as "Program Performance").
<PAGE>
          Confidentiality Agreement                                      Page 2

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

              1.    When Information is clearly marked "Confidential or later
          confirmed in writing to be confidential, Recipient agrees to keep the
          Information in strict confidence and not to disclose or otherwise use
          the Information for any purpose other than Program Performance without
          the prior written consent of Company. Accordingly, Recipient agrees to
          take all reasonable precautions to prevent the unauthorized disclosure
          to any third party of the Information received from Company. Recipient
          agrees to disclose such Information only to University employees and
          solely to those University employees who:

               (a) Recipient knows have entered into a confidentiality agreement
          in the form of this Agreement which was signed by Company and which
          concerns the Information; and

              (b) need to know the Information because they are assisting
          Recipient in the Program Performance.

              2.    The above notwithstanding, Recipient's obligation of
          confidence with respect to the Information disclosed or developed
          hereunder shall not include:

                   (a) Information which, at the time of disclosure to

               Recipient, is published, known publicly or otherwise becomes part
               of the public domain, through no fault of Recipient;

                   (b) Information which, after disclosure to Recipient, is
               published or becomes known publicly or otherwise becomes part of
               the public domain through no fault of Recipient;

                   (c) Information which, prior to the time of disclosure to
               Recipient, is known to Recipient, as evidenced by Recipient's
               written records; and

                   (d) Information which has been disclosed to Recipient in good
               faith by a third party who has not, or is not, under any
               obligation of confidence or secrecy to Company at the time said
               third party discloses to Recipient.

              3.    No rights or license to use any Information disclosed
          hereunder, either expressed or implied, is granted by Company.
<PAGE>
          Confidentiality Agreement                                    Page 3

              4.    The obligations of confidentiality and nonuse set forth
          herein with respect to any particular Information shall remain in
          effect for a period of five (5) years after the date of disclosure of
          that Information, or for as long as Company has a documentable
          confidentiality obligation to a third party for Information disclosed
          to Recipient, whichever is longer.

              IN WITNESS WHEREOF, the parties intending to be legally bound have
          caused this Agreement to be executed by themselves or by their duly
          authorized representatives as of the last date written below.

          For PI Research Corporation               For Recipient


          By:                                       By:
             ------------------------                  ----------------------
                                    
          Printed                                   Printed
          Name:                                     Name:
               ----------------------                    --------------------
                                    
          Title:                                    Date:
                ---------------------                    --------------------

          Date:
               ---------------------- 



                                                               Exhibit 10.73


<PAGE>
                                                                  Execution copy

                       SPARTA PHARMACEUTICALS, INC. 
                            P.O. Box 13288
                      Research Triangle Park, NC 27709

                                                 March 15, 1996

         William M. Sullivan
         3308 Landor Road
         Raleigh, NC 27609

         Dear Mr. Sullivan:

             This letter sets forth the  terms of an amendment (the "Amendment")
         to the agreement  dated as of January  28, 1991 between you  and Sparta
         Pharmaceuticals, Inc.  (the "Company")  relating to the  terms of  your
         employment by the Company, as such agreement has been amended by letter
         agreements dated  as  of March  2,  1993, and  December 16,  1994  (the
         "Employment Agreement").

             The effective date  of this Amendment will  be March 15,  1996 (the
         "Effective Date"), the date on  which your resignation as President and
         Chief Executive  Officer becomes  effective,  provided however  nothing
         herein is intended to affect adversely rights which may have accrued to
         you under the terms  of the Employment  Agreement for service prior  to
         the  Effective  Date, including  but  not limited  to  compensation and
         equity compensation to which you may be entitled under the terms of the
         Employment  Agreement, the  1991 Stock  Plan of  the Company  and stock
         option agreements executed pursuant to such Agreement and such Plan.

             Subject  to the  foregoing,  the  Employment  Agreement  is  hereby
         amended in its entirety  to read as set forth below.  You are sometimes
         referred to in this Agreement as the "Executive".

             1.     Employment. The Company hereby agrees to  continue to employ
                    ----------
         you, and you  hereby agree to continue  to be employed, as  Chairman of
         the Board of Directors of the Company. While serving as Chairman of the
         Board of Directors of the Company, you will have such responsibilities,
         duties and  authority as are prescribed  by the By-laws of  the Company
         and as  may  from time  to time  be assigned  to  you by  the Board  of
         Directors (the "Board")  that are  customary for,  and consistent  with
         your  status as,  the Chairman  of the  Board of  Directors, including,
         without limitation, presiding at meetings of the stockholders and Board
         and assisting management of the  Company in preparing therefor, and, as
         reasonably requested by  management, assisting in presentations  to the
         financial community  and partnering  discussions. You  shall have  such
         other duties  as you and the Company  may from time to  time agree. You
         will be an officer  of the Company and report only to  the Board. It is
         anticipated that  you will devote  an average of approximately  one day
         per week to  performance of services hereunder, although  you shall not
         be required to  devote any specific minimum amount of time each week to
         the discharge of your duties.
<PAGE>
             You  shall  not  be  required  to perform  any  legal  services  in
         connection with your duties hereunder.  In the event the Company wishes
         to retain  you to perform legal services and you  are willing to do so,
         such  services shall  be on such  terms and conditions,  and subject to
         such  additional compensation, as you and the  Company may from time to
         time  agree,  including,  without  limitation,  fees  for  professional
         services  and expenses and the cost of professional liability insurance
         which you may reasonable incur in connection therewith.

             2.    Work  for Others. The Company recognizes and  agrees that you
                   ----------------
         may perform services  for other persons or entities,  provided that you
         do not deem such services to  be a conflict of interest or a  breach of
         your fiduciary duty  to the Company, and provided  further that nothing
         contained in this Paragraph 2 shall be  deemed to prevent or limit your
         right to serve as Chairman of the Board, Director of, consultant to, or
         in  any other capacity  with, The Immune  Response Corporation, Procyte
         Corporation, BioVentures,  Inc. and  Research Corporation  Technologies
         and conduct  such activities  and engage in  such duties  in connection
         with such  responsibilities as you  may deem necessary or  desirable in
         connection therewith.

             3.      Term. (a) Your  retention hereunder  shall commence  on the
                     ----
         Effective Date, and will continue until the second anniversary thereof,
         subject to extension in accordance with the provisions of the following
         paragraph,  unless  terminated  earlier in  accordance  with  the terms
         hereof (the "Employment Term").

             (b)  Notwithstanding  the  foregoing, on  each  anniversary  of the
         Effective  Date commencing  with the second  anniversary of  such date,
         your employment hereunder shall  be automatically extended for one  (1)
         year unless either you  or the Company shall have  given written notice
         to the other of a desire that such automatic extension not occur, which
         notice was given no later than  thirty (30) days prior to the  relevant
         anniversary of the Effective Date.

             4.     Principal Location. The principal location at which you will
                    ------------------
         perform your duties  will be your residence or  any temporary residence
         at which you may be located from time to time.

             5.      Compensation. (a) In consideration  for your services under
                     ------------
         this  Agreement,  you will  be  paid at  the  annual rate  of $120,000,
         payable semi-monthly in arrears, subject  to increase from time to time
         by  action of  the Board  in accordance  with your performance  and the
         Company's performance (the "Annual Base Salary").

               6.   Bonuses. You will be entitled to such bonuses as are
                    -------
         determined from time to time by the Board in accordance with your 
         performance and the Company's performance.

             7.        Expenses. The  Company  will  reimburse  you  for travel,
         entertainment and other business expenses reasonably incurred by you in
         connection  with the  business of  the Company  and its  Affiliates (as
         defined below)  to the  extent and  in a  manner  consistent with  then
         Company  policy  and appropriate  to  someone  in  a position  of  your
         stature.

                                       2
<PAGE>
             8.     Equity Compensation. (a) In connection with  your employment
                    -------------------
         by the  Company,  the  Company  agrees to  grant  you  an  option  (the
         "Option") under  its 1991 Stock Plan to purchase all  or any part of an
         aggregate of  75,000 shares of  Common Stock, $.001 par  value ("Common
         Stock"), of the Company, subject to exercise  at the price per share of
         Common Stock of Three Dollars and No Cents ($3.00), the price which the
         Company  has determined as  of the Effective Date  is their fair market
         value, and vesting at the rate of 3,125 shares on the 15th day of  each
         of  the first  twenty four  (24)  calendar months  occurring after  the
         Effective Date, provided in each ease  you are employed by the  Company
         on  such  15th day,  and  on such  other  terms and  conditions  as are
         contained in  the Company' s  1991 Stock Plan  and in the  Stock Option
         Agreement attached hereto as Exhibit A (the "Option Agreement").
                                      ---------

             (b) In connection with your  employment by the Company, the Company
         agrees  to  amend the  options  previously  granted  to you  under  the
         Company's 1991 Stock Plan, and  the stock option agreements executed in
         connection  therewith  (the  "Outstanding Options"),  so  that  (i) the
         periods  of exercise  of the  Outstanding Options  are extended  in the
         event  of termination  of your  employment  for any  reason during  the
         Employment Term whether by the Company or yourself so that such options
         may be exercised within twenty four (24) months after the date on which
         your employment terminates, but  may not be exercised  thereafter, (ii)
         the number of shares of Common Stock (subject to adjustment as provided
         in  the  Stock  Option  Plan)   which  may  be  exercisable  under  the
         Outstanding Options on the Effective  Date shall be the greater  of (x)
         the  aggregate  amount  that  is  or would  be  exercisable  under  the
         Outstanding  Options  on  the  second  anniversary  of  the  respective
         effective   dates   of   the  grants   of   the   Outstanding  Options,
         notwithstanding that your employment under the Employment Agreement (as
         in  effect  immediately prior  to  the  Effective  Date) may  not  have
         continued until such  anniversary, and  (y) the  aggregate amount  that
         would  be exercisable under the Outstanding  Options on the anniversary
         of  the respective  effective dates  of the  grants of  the Outstanding
         Options  next occurring  after the  Effective Date  if  your employment
         under the Employment  Agreement (as in effect immediately  prior to the
         Effective Date) had continued until such anniversary,  (iii) the number
         of shares of  Common Stock  (subject to adjustment  as provided in  the
         Stock  Option Plan)  which  may be  exercisable  under the  Outstanding
         Options and is not exercisable on the Effective Date in accordance with
         clause (ii) shall vest on the 15th day of each calendar month occurring
         after the Effective Date, provided in each case you are employed by the
         Company on such 15th day, at the greater of (A) the rate of one twenty-
         fourth (1/24th) of  such unvested shares  under any Outstanding  Option
         and (B) the  rate determined by a  fraction, the numerator of  which is
         one and the denominator of which is the number of full months remaining
         between the applicable anniversary for vesting set forth in clause (ii)
         and the  date on which an  Outstanding Option would  otherwise be fully
         exercisable, and  (iv), notwithstanding the  foregoing, the Outstanding
         Options are fully exercisable in the event of a "Change of Control" (as
         defined in the Option Agreement) while you are employed by the Company,
         commencing as  of immediately prior to the  consummation of a Change of
         Control (but  subject to the  consummation of such Change  of Control),
         and in  the event of a Change of Control as a result of a tender offer,
         the Outstanding Options  are fully exercisable in a  timely manner such
         that you may participate in such tender offer at any stage, and on such
         other terms and conditions as are contained in the Company's 1991 Stock
         Plan and in the Outstanding Options.

                                     3
<PAGE>
             9.     Benefits. In connection with your employment  hereunder, you
                    --------
         will be entitled during the Employment Term to the following additional
         benefits:

              (a) At the Company' s expense, such fringe benefits as the Company
              may provide  from time to time  for its senior management,  but in
              any   event  providing  you  with  benefits  which  are  at  least
              equivalent to those set forth on Schedule A attached hereto.

              (b) The Company shall furnish you with such equipment and services
              as  shall  be  reasonably  suitable  to  and  appropriate  for the
              performance  of your  duties  from your  residences  as set  forth
              herein, but in no event less than those which have been heretofore
              provided  to  you  in  connection  with   your  duties  under  the
              Employment Agreement.

             10. Termination upon  Death or Disability.  Your employment by  the
                 --------------------------------------
         Company shall terminate  upon your death, or if, by virtue of total and
         permanent disability, you are unable to perform your duties hereunder.

             The   determination  that,  by   virtue  of  total   and  permanent
         disability, you  are unable to  perform your duties hereunder  shall be
         made by a  physician chosen by the Company  and reasonably satisfactory
         to you  (or your  legal representative). The  cost of  such examination
         shall be borne  by the Company. Without limiting  the generality of the
         foregoing,  unless otherwise agreed, you shall be conclusively presumed
         to  be  totally  and  permanently disabled  hereunder  if  for  reasons
         involving mental  or physical  illness or physical  injury you  fail to
         perform your duties hereunder for a period of  one hundred twenty (120)
         consecutive calendar  days or for  any periods aggregating  one hundred
         twenty (120) days or more in any twelve (12) consecutive month period.

             For  purposes of  this Paragraph  10, the  Termination Date  in the
         event of  death shall be  the date  of death and  in the event  of such
         total and permanent disability shall be the earlier of the date of such
         physician's examination pursuant to which such determination is made or
         the first business day after which either such 120-day has expired.

             In the  event of such  a termination of  employment as a  result of
         your death or total and permanent disability, the Company shall have no
         further obligations hereunder except as provided in Paragraph 15 and 16
         hereof and except as provided below in this Paragraph 10:

              (a)    In  the event of death  or total and permanent  disability,
              the Company shall pay  to you or your estate, as the  case may be,
              an amount equal to $240,000 less the amount of  Annual Base Salary
              previously  paid  to you  under  this Agreement,  in  twelve equal
              monthly  installments  following  the  Termination  Date  if  such
              Termination Date occurs  within twelve months after  the Effective
              Date, and if such Date occurs  later but within twenty four months
              after the  Effective Date (the  "Initial Employment  Term"), in  a
              number of  equal  installments  equal  to  the  number  of  months
              remaining in the Initial Employment Term.

                                      4
<PAGE>
             11. Termination by the Executive. Your employment may be terminated
                 ----------------------------
         by you, by giving a Notice of Termination at any time by written notice
         of at  least one  (1) month to  the Company,  which time period  may be
         waived by the Company in its discretion.

             The Termination Date in the event  of a termination (i) pursuant to
         subparagraph (a) immediately above shall  be the date set forth in  the
         Notice  of Termination,  except as  the Company  and you  may otherwise
         agree  to a shorter period of time during which your services hereunder
         shall be required, and in such event, the date as of which it is agreed
         such services shall end.

             12.        Termination  by  the  Company.  Your employment  may  be
                        -----------------------------
         terminated at any time  by the Company  (a) with Cause  by a Notice  of
         Termination  to you, effective  immediately unless otherwise  stated in
         such notice,  which date  shall be the  Termination Date  therefor, (b)
         without Cause at any time, by a Notice of Termination to you, effective
         thirty (30) days  after the date given,  except as you and  the Company
         may  otherwise  agree,  which  date  of  effectiveness   shall  be  the
         Termination Date therefor, or (c) for total and permanent disability in
         accordance with Paragraph 10.

             For purposes of  this Agreement, the Company shall  have "Cause" to
         terminate your employment hereunder upon (i) the willful  and continued
         failure  by you to  substantially perform your  duties hereunder (other
         than any such failure resulting from your incapacity due to physical or
         mental  illness or  any such  actual or  anticipated failure  after the
         issuance  of a  Notice of  Termination by  you for  Good Reason)  after
         demand for substantial  performance is delivered by the  Company to you
         that specifically identifies the  manner in which the Company  believes
         you  have not  substantially performed  your duties,  (ii) the  willful
         engaging  by you  in misconduct  which is  materially injurious  to the
         Company, monetarily or otherwise, or (iii) the willful violation by you
         of the provisions of Paragraph 17 ("Unauthorized Disclosure"), provided
         that  such violation  results in  material injury  to the  Company. For
         purposes of  this paragraph, no  act, or failure  to act, on  your part
         shall be  considered "willful" unless done,  or omitted to  be done, by
         you not in good faith and without reasonable belief that your action or
         omission was in  the best interest of the  Company. Notwithstanding the
         foregoing,  you shall not  be deemed to have  been terminated for Cause
                                       ------
         unless (1)  reasonable notice to you setting  forth the reasons for the
         Company's intention to terminate for Cause, (2) an opportunity for you,
         together with  your counsel,  to be  heard before  the  Board, and  (3)
         delivery to you of a Notice of  Termination from the Board finding that
         in the good faith opinion of a majority of the Board you were guilty of
         conduct  set forth  above  in clause  (I),  (ii) or  (iii) hereof,  and
         specifying the particulars thereof in detail.

             13. Notice  of Termination. Any  termination of your  employment by
                 ----------------------
         the Company  or by  you (other  than  as a  result of  death) shall  be
         communicated by written Notice of Termination to the other party hereto
         in  accordance with  Paragraph 21.  For purposes  of this  Agreement, a
         "Notice of  Termination" shall mean  a notice which shall  indicate the
         specific termination provision in this  Agreement relied upon and shall
         set forth in  reasonable detail the facts and  circumstances claimed to
         provide a basis for the termination under the provision so indicated.

                                     5
<PAGE>
          14.    Payments of Compensation Upon Termination for other than Death
                 --------------------------------------------------------------
                                      or Disability.
                                      -------------

             (a) In the event your employment hereunder is terminated by you for
         any reason, or by  the Company during the Initial Employment Term other
         than for  either Cause or total  and permanent disability, you shall be
         entitled to monthly payments equal to the greater of (i) one twelfth of
         the  remainder  of $240,000  less  the  amount  of Annual  Base  Salary
         previously  paid  to you  under  this  Agreement  and (ii)  the  amount
         determined by multiplying such remainder  by a fraction, the  numerator
         of which is one  and the denominator of which  is the number of  months
         remaining in the Initial Employment  Term, for the period commencing on
         the Termination  Date and  continuing for twelve  (12) months  from the
         Termination Date if the immediately preceding clause (i) is applicable,
         or for the number of months remaining in the Initial Employment Term if
         clause (ii) is applicable.

             (b) In  the event the  Company shall terminate your  employment for
         Cause, then  you shall  be entitled as  of the  Termination Date  to no
         compensation under this Agreement, except as provided in Paragraph 16.

             15.  Continuation  of Benefits.  In  addition,  in the  event  your
                  -------------------------
         employment hereunder is  terminated at  the expiration  of the  Initial
         Employment Term or, if  earlier, (a) by you for  any reason, or (b)  by
         the  Company without Cause  or (c) as  a result of  total and permanent
         disability in accordance with Paragraph  10, then you shall continue to
         be  entitled  to  the  benefits  to  which  you  were  entitled  as  of
         immediately preceding the expiration of the Initial Employment Term, or
         the  applicable Termination  Date,  as  the case  may  be, pursuant  to
         Paragraph 9(a) hereof  at the Company's expense for a period of one (1)
         year  after the Initial Employment Term or the Termination Date, as the
         case may be, except as otherwise required by law.

             16. Accrued Compensation.  In the event of any  termination of your
                 --------------------
         employment for  any reason, you  (or your  estate) shall  be paid  such
         portion  of  your  Annual  Base  Salary  and  bonuses  as  has  accrued
         (including,  without limitation, as  provided below) by  virtue of your
         employment during the period  prior to termination and has not yet been
         paid, together with any  amounts for expense reimbursement and  similar
         items  which  have  been  properly  incurred  in  accordance  with  the
         provisions hereof prior to termination and have not yet been paid. Such
         amounts shall be paid within ten (10) days of the Termination Date. The
         amount due  to you (or your estate) under  this Paragraph 16 in payment
         of any bonus  shall be a proportionate  amount of the bonus  that would
         otherwise have been due to you as if such termination had not occurred.

             17.      Confidentiality Agreement.  The Confidentiality  Agreement
                      -------------------------
         dated   January  28,   1991,   between  you   and   the  Company   (the
         "Confidentiality Agreement") shall  remain in full force  and effect as
         provided therein.

             18. Key Man Insurance. You  agree to make such disclosures 
                 -----------------
         regarding your personal health,  engage in a physical examination 
         conducted by a physician reasonably satisfactory to you,

                                     6
<PAGE>
         and execute such documents,  as may be reasonably required so  that the
         Company  can obtain  and  maintain in  effect during  the term  of this
         agreement a policy  of insurance payable to the Company in the event of
         your death of at least $2,000,000, provided that the Company' s failure
         to obtain or  maintain in  effect any such  policy shall not  otherwise
         affect its or your obligations and benefits under this agreement.

             19.  Parties. This  Agreement is personal  and shall  in no  way be
                  -------
         subject  to  assignment by  you  except  as contemplated  hereby.  This
         Agreement shall  be binding upon and shall inure  to the benefit of the
         Company and its  successors and assigns either by  merger, operation of
         law,  consolidation, assignment, purchase or otherwise of a controlling
         interest in  the business of the Company and  shall be binding upon and
         shall   inure   to  the   benefit  of   you,  your   heirs,  executors,
         administrators,  personal  and   legal  representatives,  distributees,
         devisees, legatees, successors and permitted assigns. If you should die
         while any amounts  would still be payable  to you hereunder if  you had
         continued to live (other than amounts to which you would be entitled by
         reason of  continued employment),  all such  amounts, unless  otherwise
         provided herein,  shall be paid  in accordance with  the terms of  this
         Agreement to your devisees, legatees or other designees or, if there be
         no such designee,  to your estate. The Company agrees  that a successor
         in interest  by merger,  operation of  law, consolidation,  assignment,
         purchase or otherwise of a controlling interest in the  business of the
         Company will  be informed prior to such event  of the existence of this
         Agreement. The Company  will require any  successor (whether direct  or
         indirect,  by  purchase,  merger,   operation  of  law,  consolidation,
         assignment or  otherwise  of a  controlling interest  in the  business,
         stock or other assets of the Company)  to assume expressly and agree to
         perform this Agreement. As used  in this Agreement, "the Company" shall
         mean  the  Company  as  hereinbefore   defined  and  any  successor  as
         aforesaid.

             20. Invalidity. We intend this Agreement to be enforced as written.
                 ----------
         However, if any term or provision of this Agreement shall to any extent
         be  declared illegal  or unenforceable  by a  duly authorized  court of
         competent  jurisdiction, then the  remainder of this  Agreement, or the
         application of such term or provision in circumstances other than those
         as to which  it is so declared  illegal or unenforceable, shall  not be
         affected thereby,  each term and  provision of this Agreement  shall be
         valid and be enforceable to the fullest extent permitted by law and the
         illegal or unenforceable term or  provision shall be deemed replaced by
         a  term or  provision that  is  valid and  enforceable  and that  comes
         closest to  expressing the  intention of  the invalid or  unenforceable
         term or provision.

             21. Notices. All  notices and communications required  or permitted
                 -------
         to be  given hereunder shall  be duly given  by delivering the  same in
         hand or by depositing such notice or communication in the mall, sent by
         certified  or  registered  mail,   return  receipt  requested,  postage
         prepaid, or by  delivery by overnight courier, with  a receipt obtained
         therefor, as follows:

           If sent to the Company:  Sparta Pharmaceuticals, Inc.
                                    P.O. Box 13288
                                    Research Triangle Park, NC 27709

                                     7
<PAGE>
          If sent to you:   3308 Landor Road
                            Raleigh, NC 27609

         or such other  address as either party  furnishes to the other  by like
         notice, provided, however, that any notice of a change of address shall
         be effective only upon receipt.

             22. Entire Agreement.  This Agreement together with Schedule A, the
                 ----------------
         Employment Agreement, the  Subscription Agreement executed  pursuant to
         the  Employment  Agreement,  the  Option   Agreement,  the  Outstanding
         Options,  any amendments  to the Option  Agreement and  the Outstanding
         Options that  may be executed  to implement outstanding  resolutions of
         the Board of Directors and the Confidentiality Agreement constitute the
         entire  agreement  and  understanding between  us  in  relation to  the
         subject  matter  hereof  and there  are  no  promises, representations,
         conditions,  provisions or terms  related thereto other  than those set
         forth or  referred to in this  Agreement and the exhibits  hereto. This
         Agreement supersedes  as provided  herein all previous  understandings,
         agreements  and representations between  the Company and  you regarding
         your employment by the Company, written or oral.

             23. Headings.  All captions in  this Agreement are  intended solely
                 --------
         for the convenience of the parties, and  none shall be deemed to affect
         the meaning or construction of any provision hereof.

             24. Waiver. No failure of the Company  or you to exercise any power
                 ------
         reserved to it or  you, respectively, by this  Agreement, or to  insist
         upon strict  compliance by you  or the Company, respectively,  with any
         obligation or  condition hereunder,  and no custom  or practice  of the
         parties at variance with the terms hereof, shall constitute a waiver of
         the  Company's or  your right,  as  the case  may be,  to  demand exact
         compliance with any of the terms hereof.  Waiver by either party of any
         particular default by the other party hereto shall not affect or impair
         the waiving  party's rights with  respect to any subsequent  default of
         the same, similar or different nature, nor shall any delay, forbearance
         or omission of  either party to exercise any power or right arising out
         of any  breach or  default by  the  other party  of any  of the  terms,
         provisions  or covenants hereof, affect or impair  our or your right to
         exercise the same, nor shall such constitute a waiver by the Company or
         you, as  the case  may be,  of any  right  hereunder, or  the right  to
         declare  any  subsequent  breach  or  default  and  to  terminate  this
         Agreement prior to the expiration of its term.

             25. Affiliate. As used herein, the term "Affiliate" shall be deemed
                 ---------
         to   include  any  corporation,   joint  venture,  or   other  business
         enterprise, whether incorporated or  unincorporated, which the  Company
         directly, or indirectly through one or more intermediaries, controls or
         is controlled by, or is under common control with.

             26. Subsidiaries.  As used  herein, the  term "Subsidiaries"  shall
                 ------------
         mean  all  corporations  a  majority  of the  capital  stock  of  which
         entitling the  holder thereof  to vote  is owned  by the  Company or  a
         Subsidiary.

                                         8

                                     
<PAGE>
             27. Governing Law.  This Agreement shall be construed  under and be
         governed in all respects by the law of the State of North Carolina.

             28. Excise  Tax. In  the event you  are subject  to any  excise tax
                 -----------
         ("Excise  Tax")  on your  compensation by  the  Company or  any  of its
         Affiliates (including  but not limited  to excise  taxes imposed  under
         Section 4999 of the Internal Revenue Code), the  Company agrees that it
         will then "gross-up"  your compensation by making an additional payment
         to you  in an amount  which, after reduction  for any income  or excise
         taxes  payable as  a result  of receiving  such additional  payment, is
         equal to the Excise Tax.

             29. Mitigation. You shall not be required to mitigate the amount of
         any payment provided for in  this Agreement by seeking other employment
         or otherwise,  nor, shall the amount of any payment provided for herein
         be  reduced  by  any compensation  earned  by  you  as  the  result  of
         employment  by another  employer or  by retirement  benefits  after the
         Termination Date or otherwise.

             30. Amendment. No amendment or modification to this Agreement shall
         be effective unless in writing and signed by both parties hereto.

             31. Counterparts. This  Agreement may be executed in  any number of
                 ------------
         counterparts, each executed  counterpart constituting  an original  and
         such counterparts together constituting one agreement.

             If you agree with the terms of your employment as set forth in this
         Agreement,  please  execute  the  duplicate copy  hereof  in  the space
         provided below.

                                            SPARTA PHARMACEUTICALS, INC,


                                            By: /s/ Lindsay A. Rosenwald, M.D.
                                                ------------------------------
                                                Lindsay A. Rosenwald, M.D.
                                                Director

         ACCEPTED AND AGREED


         /s/ William M. Sullivan
         -----------------------
         William M. Sullivan

                                     9
<PAGE>
                                   SCHEDULE A 
                                   ----------

                                    BENEFITS
                                    --------

             1.    Life Insurance Policy payable to beneficiaries designated  by
         you in the amount of at least $1,000,000.

             2.    Participation  in medical  and dental  health care  benefit
         plans,  of a  type similar  to  the plans  in which  you  are currently
         enrolled by the Company.

             3.    Non-resident membership in the Sky Club, 200 Park Avenue, 
          New York, NY.
<PAGE>
                                            EXHIBIT A

                                                      Employee Copy ________
                                                      Company Copy  ________
                                                      Option Number ________

                      SPARTA PHARMACEUTICALS INC. 
                      --------------------------

                    NONQUALIFIED STOCK OPTION AGREEMENT


             AGREEMENT made as  of the 15th day  of March, 1996,  between Sparta
         Pharmaceuticals,  Inc. (the "Company"), a Delaware corporation having a
         principal place  of business in Research Triangle Park, North Carolina,
         and William M. Sullivan of Raleigh, North Carolina, an  employee of the
         Company  (sometimes referred  to below  as  the "Employee"  and as  the
         "Optionee").

             WHEREAS, the Company desires to grant  to the Employee an Option to
         purchase shares  of its  common stock, $.001  par value  (the "Shares")
         under and for the  purposes of the 1991 Stock Plan of  the Company (the
         "Plan");

             WHEREAS, the Company and the Employee understand and agree that any
         terms used and  not defined  herein have  the same meanings  as in  the
         Plan;

             WHEREAS, the Company  and the Employee  each intend and  understand
         that the Option granted herein is not an Incentive Stock Option.

             NOW,   THEREFORE,  in   consideration  of   the  mutual   covenants
         hereinafter set  forth and for  other good and  valuable consideration,
         the parties hereto agree as follows:

              1.     GRANT OF OPTION
                     ---------------

             The Company  hereby irrevocably grants  to the Employee, as  of the
         date first set forth above (the "Effective Date"), the right and option
         to purchase all  or any part of  an aggregate of Seventy  Five Thousand
         (75,000) Shares  on the  terms and  conditions and  subject to all  the
         limitations set  forth herein  and in the  Plan, which  is incorporated
         herein by reference. The number of Shares is  subject to adjustment, as
         provided in the  Plan, in  the event  of a stock  split, reverse  stock
         split  or other events affecting  the holders of  Shares after the date
         hereof.  Determinations made in connection with this Option pursuant to
         the  Plan shall be governed by the Plan  as it exists on this date. The
         Employee acknowledges receipt of a copy of the Plan.
<PAGE>
             This  Option is  in addition  to  any other  options heretofore  or
         hereafter  granted to  the Employee  by  the Company,  but a  duplicate
         original  of this  instrument shall  not  effect the  grant of  another
         option.

              2.     PURCHASE PRICE
                     --------------

             The purchase price of the Shares covered  by the Option shall be at
         a price  per Share of  Three Dollars and  No Cents ($3.00),  subject to
         adjustment, as provided in the  Plan, in the event of a  stock split, a
         reverse stock split or other events affecting the holders of Shares.

              Payment may be by cash or certified check. 


              3.     EXERCISE OF OPTION
                     ------------------

             If the Employee has continued to be  employed by the Company on the
         15th  day of a  calendar month occurring after  the Effective Date, the
         Employee may exercise the Option for up to a number of  Shares (subject
         to adjustment as provided  in the Plan) equal to  the amount determined
         by multiplying 3,125  by the number of monthly periods during which the
         Employee shall  have been employed  occurring after the  Effective Date
         and expiring immediately  prior to such 15th day.  The foregoing rights
         are cumulative  and subject to  the other terms and  conditions of this
         Agreement and the Plan, including,  without limitation, the term of the
         Option and the  provisions affecting the Employee's ability to exercise
         the Option after termination of the employment.

              4. TERM OF OPTION
                 --------------

             The Option  shall terminate ten  (10) years from  the date of  this
         Agreement,  but  shall be  subject to  earlier termination  as provided
         herein or in the Plan.

               a.   Termination of Employment (Other than for Death or
                    --------------------------------------------------
         Disability)
         -----------

             If the  Employee's employment  ceases  (for any  reason other  than
         death or  Disability), the Option  may be exercised within  twenty four
         (24) months after the date  the Employee's employment ceases, or within
         the originally prescribed term of the Option, whichever is earlier, but
         may not be exercised thereafter.

             Notwithstanding the foregoing, in the event of the Employee's death
         within twenty four  (24) months after the termination  of such service,
         the Optionee's  Survivors may exercise  the Option within one  (1) year
         after the date of the Employee's death, but in no event  after the date
         of expiration of the term of the Option.


                                               -2-
<PAGE>
              b.     Termination of Employment as a Result of Disability or
                     ------------------------------------------------------
              Death
              -----

             In the  event the Employee's  service to the Company  terminates by
         reason of  Disability, as  determined in accordance  with the  Plan, or
         death, the Option  shall be exercisable only within one  (1) year after
         the  date of  such Disability  or  death, as  the  case may  be, or  if
         earlier, the term  originally prescribed by the Option.  In such event,
         the Option shall be exercisable:

               (1)  to the extent that the right to purchase the Shares
                    hereunder has accrued on the date of Disability or death 
                    and is in effect as of such date; and

               (2)  and to the extent any such right would have accrued under
                    Section 3 had the Employee's employment not terminated by 
                    reason of Disability or death prior to the end of the 
                    current monthly accrual period.

              c.   Change of Status
                   ----------------

             "Employment" as used  in this Agreement shall include  service as a
         director, consultant to or as an employee of the Company or any of  its
         Affiliates  and a change  of status from  one such category  to another
         shall not be treated as a termination of the "employment" hereunder.

              5.     METHOD OF EXERCISING OPTION
                     ---------------------------

             Subject to the terms  and conditions of this Agreement,  including,
         without limitation, Section  10 hereof, the Option may  be exercised by
         written notice to the Company, at the principal executive office of the
         Company. Such  notice shall state  the election to exercise  the Option
         and  the number of  Shares in respect  of which it  is being exercised,
         shall be signed by the person or  persons so exercising the Option, and
         shall be in  substantially the form attached hereto  as Exhibit A. Such
                                                                 ---------
         notice shall be accompanied by  payment of the full purchase  price for
         such  Shares in United States dollars, and  the Company shall deliver a
         certificate  or  certificates  representing  such  Shares  as  soon  as
         practicable after the notice shall be received, provided, however, that
         the Company  may delay issuance of such  Shares until completion of any
         action or obtaining  of any consent, which the  Company deems necessary
         under  any   applicable  law  (including,  without   limitation,  state
         securities or "blue sky" laws). The certificate or certificates for the
         Shares as  to which the  Option shall have  been so exercised  shall be
         registered  in the  name  of the  person or  persons so  exercising the
         Option  (or,  if  the Option  shall  be exercised  by  Employee  and if
         Employee shall so request in the notice exercising the Option, shall be
         registered in the name of the Employee and another person jointly, with
         right of survivorship)  and shall be delivered as provided  above to or
         upon the written order of the person or  persons exercising the Option.
         In the  event the  Option  shall be  exercised, pursuant  to Section  4
         hereof, by any person  or persons other than the  Employee, such notice
         shall be accompanied by appropriate proof  of the right of such  person
         or persons to  exercise the Option. All Shares that  shall be purchased
         upon the exercise of the Option as  provided herein shall be fully paid
         and non-assessable.


                                            -3-
<PAGE>
              6.    PARTIAL EXERCISE
                    ----------------

             Exercise of this Option to the  extent above stated may be made  in
         part at any time  and from time to time within the above limits, except
         that no fractional Share shall be issued pursuant to this Option.

              7.     NON-ASSIGNABILITY
                     -----------------

             The Option shall not be transferable by the Employee otherwise than
         by will  or  by the  laws  of descent  and  distribution and  shall  be
         exercisable,  during the  Employee's lifetime,  only  by the  Employee.
         Except as provided in  the preceding sentence, the Option shall  not be
         assigned, pledged or  hypothecated in any way (whether  by operation of
         law or otherwise) and shall not be subject to execution, attachment  or
         similar  process.   Any   attempted   transfer,   assignment,   pledge,
         hypothecation  or other  disposition of  the  Option or  of any  tights
         granted hereunder contrary to the provisions  of this Section 7, or the
         levy of  any  attachment or  similar process  upon the  Option or  such
         rights, shall be null and void.

              8.     NO RIGHTS AS STOCKHOLDER UNTIL, EXERCISE
                     ----------------------------------------

             The Employee shall have no rights as  a stockholder with respect to
         Shares subject to this Agreement until a stock certificate therefor has
         been issued  to  the Employee  and  is fully  paid  for. Except  as  is
         expressly provided in the Plan  with respect to certain changes  in the
         capitalization  of  the  Company,  no  adjustment  shall  be  made  for
         dividends or  similar rights for which the record  date is prior to the
         date such stock certificate is issued.

              9.     CAPITAL CHANGES AND BUSINESS SUCCESSIONS
                     ----------------------------------------

             The Plan contains provisions covering the treatment of Options in a
         number of contingencies such  as stock splits and mergers and  sales of
         the  Company. Provisions  in the  Plan for  adjustment with  respect to
         stock subject  to Options  and the related  provisions with  respect to
         successors to  the business of  the Company are hereby  made applicable
         hereunder and are incorporated herein by reference.

             Notwithstanding the foregoing provisions of  this Section 9, in the
         event of a "Change of Control" (as defined below) while the Optionee is
         an  employee of the Company, the Optionee shall be entitled to exercise
         this Option, commencing as of  immediately prior to the consummation of
         such Change of Control (but subject  to the consummation of such Change
         of Control)  and in the event of  a Change of Control as  a result of a
         tender offer,  this Option shall  become fully exercisable in  a timely
         manner such that  the Optionee may participate in  such tender offer at
         any  stage, for  all of the  Shares then remaining  subject to purchase
         under such  Option whether  or not  the right  to purchase such  Shares
         shall have become vested and become exercisable.

              A "Change of Control" shall be deemed to have occurred upon the
         occurrence of any of


                                          ~~  -4-
<PAGE>
         the following:

             (i) any sale, lease, exchange or other transfer (in one transaction
         or a series of transactions contemplated or arranged by any party  as a
         single plan) of all or substantially all of the assets of the Company;

             (ii) individuals who,  as of March 15, 1996,  constitute the entire
         Board of Directors of the Company (the "Incumbent Directors") cease for
         any reason  to  constitute  at least  50%  of the  Board  of  Directors
         (hereinafter  referred  to  as  a "Board  Change"),  provided  that any
         individual  becoming  a director  subsequent  to March  15,  1996 whose
         election or nomination  for election was approved by a vote of at least
         a majority  of the then  Incumbent Directors shall be,  for purposes of
         provision,  considered  as  though such  individual  were  an Incumbent
         Director; or

             (iii)  any consolidation  or  merger  of  the  Company  (including,
         without limitation, a triangular merger)  where the shareholders of the
         Company, immediately prior to the  consolidation or merger, would  not,
         immediately  after  the  consolidation  or  merger,  beneficially  own,
         directly or  indirectly, Shares representing in the aggregate more than
         50% of the  combined voting power of all the  outstanding securities of
         the Company issuing  cash or securities in the  consolidation or merger
         (or of its ultimate parent Company, if any); or

             (iv) any "person,"  as such term  is used in  Section 13(d) of  the
         Securities  Exchange  Act  of  1934,   as  amended  (or  any  successor
         provision) (the "Exchange Act") (other  than the Company, any  employee
         benefit  plan of  the Company  or  any entity  organized, appointed  or
         established by  the Company for  or pursuant to  the terms of  any such
         plan), together with  all "affiliates" and "associates"  (as such terms
         are defined  in Rule  12b-2 under  the Exchange  Act  or any  successor
         provision)  of such  person,  shall become  the  "beneficial owner"  or
         "beneficial  owners" (as  defined in  Rules 13d-3  and 13d-5  under the
         Exchange Act or  any successor provision),  directly or indirectly,  of
         securities of the Company representing  in the aggregate thirty percent
         (30%)  or  more of  either (a)  the then outstanding  shares of  Common
         Stock of  the Company  or (b)  the combined  voting power  of all  then
         outstanding securities of the  Company having the right under  ordinary
         circumstances to  vote in an election of the  Board of Directors of the
         Company   ("Voting   Securities")   (hereafter  referred   to   as   an
         "Acquisition");  provided,  that,  notwithstanding  the  foregoing,  an
         Acquisition shall not be deemed to  have occurred for purposes of  this
         clause (iv) (1) solely as the result of an acquisition of securities by
         the Company which,  by reducing the number of shares of Common Stock or
         other Voting  Securities outstanding,  increases (x) the  proportionate
         number of shares of  Common Stock beneficially  owned by any person  to
         thirty percent  (30%) or more of  the Common Stock  then outstanding or
         (y) the proportionate voting power represented by the Voting Securities
         beneficially owned by any person to thirty percent (30%) or more of the
         combined voting power of all  then outstanding Voting Securities or (2)
         solely as the result of an acquisition of securities from  the Company;
         except that if  any person referred  to in clause  (1)(x) or (1)(y)  of
         this sentence  or to  which clause (2)  of this sentence  is applicable
         shall thereafter become the beneficial  owner of any additional  shares
         of Common Stock  or other Voting Securities  (other than pursuant to  a
         stock split, stock dividend or similar

                                         -5-
<PAGE>
         transaction  or a  transaction to  which clause  (2) applies),  then an
         Acquisition  shall be  deemed to  have  occurred for  purposes of  this
         clause (iv).

              10.    TAXES AND WITHHOLDING
                     ---------------------

             The Employee acknowledges  that any income or other  taxes due from
         him or her with respect to this  Option or the Shares issuable pursuant
         to this Option shall be the Employee's responsibility.

             In  the event  of  the exercise  of this  Option,  the Company  may
         withhold from the Employee's  fees,  if any, or other  remuneration, or
         as a condition of the exercise hereof, may require the Employee to pay,
         additional  federal,  state, and  local income  tax withholding  and if
         applicable at such time, employee contributions to employment taxes, in
         respect of  the amount  that is considered  compensation includable  in
         such person's gross income.

              11.    PURCHASE FOR INVESTMENT
                     -----------------------

             Unless the offering  and sale of the  Shares to be issued  upon the
         particular  exercise  of   the  Option  shall  have   been  effectively
         registered  under  the Securities  Act  of  1933, as  now  in  force or
         hereafter amended (the "Act"), the Company shall be under no obligation
         to  issue the  Shares covered  by  such exercise  unless and  until the
         following conditions have been fulfilled:

              (a)  The  person(s) who exercise  the Option shall  warrant to the
                   Company, at the  time of such  exercise, that such  person(s)
                   are  acquiring such Shares for their own respective accounts,
                   for  investment, and  not  with a  view  to, or  for  sale in
                   connection  with, the  distribution of  any  such Shares,  in
                   which  event the  person(s) acquiring  such  Shares shall  be
                   bound by the  provisions of the following legend  which shall
                   be  endorsed upon  the  certificate(s) evidencing  the Shares
                   issued pursuant to such exercise:

                        "The shares represented  by this  certificate have  been
                        taken  for investment  and  they  may  not  be  sold  or
                        otherwise  transferred   by  any  person,   including  a
                        pledgee, unless (1) either  (a) a registration statement
                        with respect to such shares shall be effective under the
                        Securities Act of  1933, as amended, or (b)  the Company
                        shall have received  an opinion of  counsel satisfactory
                        to it that an exemption from registration under such Act
                        is  then  available,  and  (2)  there  shall  have  been
                        compliance with all applicable state securities laws."

              (b)  If the Company so requires, the Company shall have received 
                   an opinion of its counsel that the Shares may be issued upon
                   such particular exercise in compliance with the Act without 
                   registration thereunder. Without limiting the generality of 
                   the foregoing, the Company may delay issuance of the Shares 
                   until completion of any

                                           -6-

<PAGE>
                   action  or obtaining of  any consent which  the Company deems
                   necessary  under  any   applicable  law  (including   without
                   limitation state securities or "blue sky" laws).

              12.    NO OBLIGATION TO RETAIN
                     -----------------------

             Neither the  Company  nor any  subsidiary is  by the  Plan or  this
         Agreement  obligated to  continue the  Employee as  an employee  to the
         Company or any subsidiary or in any other capacity.

              13.    OPTION IS NOT AN INCENTIVE STOCK OPTION
                     ---------------------------------------

             The parties  each intend and  understand that the Option  is not an
         incentive stock option. Employee should consult with Employee's own tax
         advisors regarding the tax effects of the Option.

              14.    CONSULTATION WITH TAX ADVISOR
                     -----------------------------

             Employee  should consult with Employee's own tax advisors regarding
         the  tax effects of the Option and the consequences of the nonqualified
         status of the Option.

              15.    NOTICES
                     -------

             Any notices required or permitted by the terms of this Agreement or
         the Plan shall  be given when delivered  in person or by  registered or
         certified mail, return receipt requested, addressed as follows:

                        To the Company:

                             Sparta Pharmaceuticals, Inc.
                             P.O. Box 13288
                             Research Triangle Park, NC 27709 
                             Attn: President

                        To the Employee:

                             3308 Landor Road
                             Raleigh, NC 27609

         or to  such other  address or  addresses of  which notice  in the  same
         manner has previously  been given. Any  such notice shall be  deemed to
         have  been  given  when  received  in  accordance  with  the  foregoing
         provisions.

                                          -7-
<PAGE>
              16.    GOVERNING LAW
                     -------------

             This Agreement shall be  construed and enforced in accordance  with
         the law of the State of Delaware.

              17.    BENEFIT OF AGREEMENT
                             ---

             Subject  to the  provisions of  the Plan  and the  other provisions
         hereof, this Agreement shall be for the benefit of and shall be binding
         upon  the heirs, executors,  administrators, successors and  assigns of
         the parties hereto.

              18.    ENTIRE AGREEMENT
                     ----------------

             This  Agreement,  together  with  the  Plan,  embodies  the  entire
         agreement  and understanding between the parties hereto with respect to
         the  subject matter  hereof and  supersedes all  prior oral  or written
         agreements and understandings relating to the subject matter hereof. No
         statement,   representation,  warranty,   covenant  or   agreement  not
         expressly  set forth  in  this Agreement  shall  affect or  be  used to
         interpret, change or restrict, the express terms and provisions of this
         Agreement, provided,  however, in  any event,  this Agreement  shall be
         subject to and governed by the Plan.

              19. MODIFICATIONS AND AMENDMENTS
                  ----------------------------

             The  terms and  provisions of  this  Agreement may  be modified  or
         amended only by written agreement executed by all parties hereto.

              20. WAIVERS AND CONSENTS
                  --------------------

             The  terms and  provisions  of  this Agreement  may  be waived,  or
         consent  for the departure therefrom granted,  only by written document
         executed  by  the party  entitled  to  the benefits  of  such  terms or
         provisions. No such  waiver or consent shall  be deemed to be  or shall
         constitute  a waiver  or consent  with  respect to  any other  terms or
         provisions of this Agreement, whether  or not similar. Each such waiver
         or consent shall be effective only in the specific instance and for the
         purpose for which  it was given, and shall not  constitute a continuing
         waiver or consent.

              21.    HEADINGS AND CAPTIONS
                     ---------------------

             The  headings  and captions  of  the various  subdivisions  of this
         Agreement are for  convenience of reference  only and  shall in no  way
         modify, or  affect the meaning or construction of,  any of the terms or
         provisions hereof.

              22.    SURVIVAL
                     --------
                                          -8-
<PAGE>
             The expiration  or other termination  of the Option granted  to the
         Employee  shall neither  affect nor alter  the Employee' s  obligations
         under Sections 10 and 11 hereof.

             IN WITNESS WHEREOF, the Company has  caused this Nonqualified Stock
         Option Agreement to  be executed by a duly authorized  officer, and the
         Employee has hereunto set his or her  hand, all as of the day and  year
         first above written.

                                  SPARTA PHARMACEUTICALS, INC.


                                  By /s/ Carline Campbell
                                     --------------------------
                                      Controller & Treasurer


                                      /s/ William M. Sullivan
                                     --------------------------
                                         William M. Sullivan


                                      -9-
<PAGE>
                                                               EXHIBIT A
                                                               ---------

             NOTICE OF EXERCISE OF NONQUALIFIED STOCK OPTION 

         To: Sparta Pharmaceuticals, Inc.


         Ladies and Gentlemen:

             I hereby exercise my Nonqualified Option to purchase _______ shares
         (the  "Shares")  of  the  common  stock, $.001  par  value,  of  Sparta
         Pharmaceuticals, Inc.  (the "Company"), at  the exercise price  of $___
         per  share,  pursuant  to and  subject  to the  terms  of  that certain
         Nonqualified Stock  Option Agreement  between the  undersigned and  the
         Company dated as of March 15, 1996.

             I am  aware  that the  Shares have  not been  registered under  the
         Securities  Act  of 1933,  as  amended (the  "1933  Act") or  any state
         securities  laws. I  understand that  the  reliance by  the Company  on
         exemptions under the  1933 Act is predicated in part upon the truth and
         accuracy of the statements by me in this Notice of Exercise.

             I hereby represent and warrant that (1) I have  been furnished with
         all information which I deem necessary to evaluate the merits and risks
         of  the purchase of the Shares;  (2) I have had  the opportunity to ask
         questions concerning the Shares and the Company and all questions posed
         have  been answered  to  my satisfaction;  (3) I  have  been given  the
         opportunity to obtain  any additional information  I deem necessary  to
         verify the accuracy of  any information obtained concerning the  Shares
         and  the Company;  and  (4) I  have  such knowledge  and  experience in
         financial and business  matters that I am  able to evaluate  the merits
         and risks of  purchasing the Shares and to make  an informed investment
         decision relating thereto.

             I hereby represent and warrant that I am purchasing the Shares  for
         my own personal account for investment and not with a view to the  sale
         or distribution of all or any part of the Shares.

             I understand that because the Shares have not been registered under
         the  1933  Act,  I must  continue  to  bear the  economic  risk  of the
         investment  for an indefinite time and the Shares cannot be sold unless
         the Shares  are subsequently  registered under  applicable federal  and
         state   securities  laws  or   an  exemption  from   such  registration
         requirements is available.

             I agree that I will in no event sell or distribute or otherwise
         dispose of all or any part of
<PAGE>
         the Shares  unless  (1) there  is an  effective registration  statement
         under the  1933 Act and  applicable state securities laws  covering any
         such transaction  involving the Shares  or (2) the Company  receives an
         opinion of  my legal  counsel (concurred  in by legal  counsel for  the
         Company) stating that such  transaction is exempt from  registration or
         the Company otherwise satisfies itself that such transaction  is exempt
         from registration.

             I  consent to  the placing of  a legend  on my certificate  for the
         Shares stating  that the  Shares have not  been registered  and setting
         forth  the restriction  on  transfer  contemplated  hereby and  to  the
         placing of  a stop transfer order on the  books of the Company and with
         any transfer agents against the Shares until the Shares  may be legally
         resold or distributed without restriction.

             I understand that at  the present time Rule  144 of the  Securities
         and Exchange Commission (the "SEC") may not be relied on for the resale
         or distribution of  the Shares by me. I understand that the Company has
         no obligation to  me to register  the Shares with  the SEC and  has not
         represented to me that it will register the Shares.

             I am  aware that  it is  my responsibility  to have  consulted with
         competent tax and legal advisors about the relevant national, state and
         local  income tax  and securities  laws affecting  the exercise  of the
         Option and the purchase and subsequent sale of the Shares.

             My check payable to the order of the Company in the amount of $____
         is enclosed in payment of 100% of the option exercise price for the 
         Shares.

             I acknowledge  that the Company  is authorized to withhold  from my
         wages, if any, or other remuneration, or may require me, as a condition
         of the  exercise of the Option,  to pay, additional federal,  state and
         local  income tax withholding and if applicable, employee contributions
         to  employment  taxes in  respect  of  the  amount that  is  considered
         compensation includable in my gross income.

             Please issue the stock certificate for the Shares (check one):

                   ____ to me

                   ____ to me and ____________ as joint tenants with right of

         survivorship and mail the certificate to me at the following address:


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

         ----------------------------
<PAGE>
             My mailing address, if different from the address listed above, for
         shareholder communications is:


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

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


                                  Very truly yours,


                                  -------------------
                                  Employee (signature) 


                                  -------------------------------
                                  Print Name


                                  Date
                                  -------------------------------


                                  -------------------------------
                                  Social Security Number

                                                               Exhibit 10.74


<PAGE>
                        SPARTA PHARMACEUTICALS, INC.

                        PLACEMENT AGENCY AGREEMENT
                        --------------------------

                                                      January 22, 1996

         Paramount Capital, Inc.
         375 Park Avenue
         Suite 1501
         New York, New York 10152

         Dear Sirs:

             Sparta Pharmaceuticals Inc., a Delaware corporation (the
         "Company"), hereby confirms its agreement to retain Paramount Capital,
         Inc. (the "Placement Agent") on an exclusive basis to introduce the
         Company to and to procure subscriptions from certain "accredited
         investors" (as defined in Regulation D under the Securities Act of
         1933, as amended) as prospective purchasers of units (the "Units") of
         the Company at a purchase price to be determined, with each unit
         consisting of equity securities of the Company.

             The sale to such purchasers (the "Offering") will be made through a
         private placement by the Placement Agent (or its designated selected
         dealers which will be bound by agreements substantially the same as
         contained herein for the Placement Agent) on a "best efforts" basis,
         pursuant to the Confidential Term Sheet dated January 22, 1996 and all
         supplements and amendments thereto and exhibits thereto (the "Term
         Sheet"), separate purchase agreements (the "Subscription Agreements")
         and related documents in accordance with Section 4(2) of the Securities
         Act of 1933, as amended (the "Securities Act") and Regulation D
         promulgated thereunder.

             The Term Sheet, the Subscription Agreements, the Placement Agency
         Agreement, a Financial Advisory Agreement to be dated the date of the
         Closing ("the Financial Advisory Agreement") and a specimen of the
         Common Stock are collectively referred to herein as the "Offering
         Documents."

             The Company, at its sole cost, shall prepare and deliver to the
         Placement Agent a reasonable number of copies of the Offering Documents
         in form and substance satisfactory to the Placement Agent.

             Each prospective investor subscribing to purchase Units shall be
         required to deliver, among other things, a Subscription Agreement,
         which shall include a Confidential Investor Questionnaire
         ("Questionnaire"). The Company shall make available to each prospective
         purchaser at a reasonable time prior to the purchase of the Units the
         opportunity to ask questions of and receive answers from the Company
         concerning the terms and conditions of the Offering and the opportunity
         to obtain additional information necessary to verify the accuracy of
         the documents delivered in connection with the purchase of the Units to
         the extent it possesses such
<PAGE>
         Paramount Capital, Inc. 
         Page 2

         information or can acquire it without unreasonable effort or expense.
         After the Offering Documents have been reviewed by investors, and they
         have had the opportunity to address all inquiries to the Company,
         separate Subscription Agreements shall be completed with each
         prospective investor. The Company or Placement Agent shall have the
         right to reject subscriptions in its sole discretion. The Company shall
         evidence its acceptance of a subscription by countersigning a copy of
         the applicable Subscription Agreement and returning the same to you.

             Capitalized terms used  herein, unless otherwise defined  or unless
         the context otherwise indicates, shall  have the same meanings provided
         in the Offering Documents.

                   1.    Appointment of Placement Agent.
                         -------------------------------

             (a)    You are hereby appointed exclusive Placement Agent of the
         Company (subject to your right to have Selected Dealers, as defined in
         Section 1(c) hereof, participate in the Offering) during the Offering
         Period herein specified for the purposes of assisting the Company in
         finding qualified Subscribers pursuant to the Offering described in the
         Offering Documents. You shall not be deemed an agent of the Company for
         any other purpose. The Offering Period shall commence on the day the
         Offering Documents are first made available to you by the Company for
         delivery in connection with the offering for sale of the Units and
         shall continue until the earlier to occur of (i) the sale of 30 Units 
         in the Offering or (ii) February 15, 1996 (unless the Offering is 
         extended by the Placement Agent for up to an additional 30 days). 
         If subscriptions for 25 Units are not received prior to the end of 
         the Offering Period, the Offering will be terminated and 
         all funds received from Subscribers will be returned, without interest 
         and without any deduction. The day that the Offering Period terminates 
         is hereinafter referred to as the "Termination Date."

             (b) Subject to the performance by the Company of all of its
         obligations to be performed under this Agreement and to the
         completeness and accuracy of all representations and warranties of the
         Company contained in this Agreement, the Placement Agent hereby accepts
         such agency and agrees to use its best efforts to assist the Company in
         finding qualified subscribers pursuant to the Offering described in the
         Offering Documents and to keep the Company or its counsel reasonably
         informed of subscriptions received. It is understood that the Placement
         Agent has no commitment to sell the Units. Your agency hereunder is not
         terminable by the Company except upon termination of the Offering
         Period.

             (c)    You may engage other persons, selected by you in your
         discretion, that are members of the National Association of Securities
         Dealers, Inc., ("NASD") and that have executed a Selected Dealers
         Agreement in the form provided to the Company to assist you in the
         Offering (each such person being hereinafter referred to as a "Selected
         Dealer") and you may allow such persons such part of the
<PAGE>
         Paramount Capital, Inc. 
         Page 3

         compensation and payment of expenses payable to you hereunder as you
         shall determine, provided that such compensation shall be received
         pursuant to Section 1(d) hereof.

             (d) Subscriptions for Units shall be evidenced by the execution by
         Subscribers of a Subscription Agreement. No Subscription Agreement
         shall be effective unless and until it is accepted by the Company.
         Until the Closing, all subscription funds received shall be held as
         described in the Subscription Agreement. The Placement Agent shall not
         have any obligation to independently verify the accuracy or
         completeness of any information contained in any Subscription Agreement
         or the authenticity, sufficiency, or validity of any check delivered by
         any prospective investor in payment for Units.

             2.    Representations and Warranties of the Company. The Company
                   ---------------------------------------------
         represents and warrants to the Placement Agent and each Selected
         Dealer, if any, as follows:

             (a) Securities Law Compliance. The Offering Documents, as of their
                 -------------------------
         respective dates, do and will, as of the date of the Term Sheet and the
         Closing, describe the material aspects of an investment in the Company
         and conform in all respects with the requirements of Section 4(2) of
         the Securities Act and Regulation D promulgated thereunder and with the
         requirements of all other published rules and regulations of the
         Securities and Exchange Commission (the "Commission") currently in
         effect relating to "private offerings" to "accredited investors" of the
         type contemplated by the Company. The Offering Documents will not as of
         the date of the Term Sheet and the Closing contain an untrue statement
         of a material fact or omit to state any material fact necessary in
         order to make the statements therein, in light of the circumstances
         under which they were made, not misleading, provided, however, that no
         representation is made with respect to information, relating to the
         Placement Agent, provided in writing by the Placement Agent to the
         Company specifically for inclusion in the Offering Documents. If at any
         time prior to the completion of the Offering or other termination of
         this Agreement any event shall occur as a result of which it might
         become necessary to amend or supplement the Offering Documents so that
         they do not include any untrue statement of any material fact or omit
         to state any material fact necessary in order to make the statements
         therein, in the light of the circumstances then existing, not
         misleading, the Company will promptly notify you and will supply you
         with amendments or supplements correcting such statement or omission.
         The Company will also provide the Placement Agent for delivery to all
         offerees and purchasers and their representatives, if any, any
         information, documents and instruments which the Placement Agent and
         the Company's counsel reasonably deem necessary to comply with
         applicable state and federal law.

             The Company acknowledges that the Placement Agent (i) has not
         supplied any information for inclusion in the Offering Documents other
         than information furnished in writing to the Company by the Placement
         Agent specifically
<PAGE>
         Paramount Capital, Inc. 
         Page 4

         for inclusion in the Offering Documents; (ii) has no obligation to
         independently verify any of the information in the Offering Documents;
         and (iii) has no responsibility for the accuracy or completeness of the
         Offering Documents, except for the information, relating to the
         Placement Agent, furnished in writing by the Placement Agent to the
         Company specifically for inclusion in the Offering Documents.

             (b) Organization. The Company is a corporation duly organized,
                 ------------
         validly existing and in good standing under the laws of the State of
         Delaware and has all requisite corporate power and authority to own and
         lease its properties, to carry on its business as currently conducted
         and as proposed to be conducted, to execute and deliver this Agreement
         and to carry out the transactions contemplated by this Agreement, as
         appropriate and is duly licensed or qualified to do business as a
         foreign corporation in North Carolina and each jurisdiction in which
         the conduct of its business or ownership or leasing of its properties
         requires it to be so qualified, except where the failure to be so
         qualified would not have a material adverse effect on the business,
         financial condition or prospects of the Company.

             (c)    Capitalization. The authorized, issued and outstanding
                    --------------
         capital stock of the Company prior to the consummation of the
         transactions contemplated hereby is as set forth in the Offering
         Documents. All issued and outstanding shares of the Company are validly
         issued, fully paid and nonassessable and have not been issued in
         violation of the preemptive rights of any stockholder of the Company.
         All prior sales of securities of the Company were either registered
         under the Act and applicable state securities laws or exempt from such
         registration, and no security holder has any rescission rights with
         respect thereto. Except as set forth in the Term Sheet, there are no
         outstanding options, warrants, agreements, convertible securities,
         preemptive rights or other rights to subscribe for or to purchase any
         shares of capital stock of the Company. Except as set forth in the Term
         Sheet and as otherwise required by law, there are no restrictions upon
         the voting or transfer of any shares of the Company's capital stock
         pursuant to the Company' s Certificate of Incorporation, By-Laws or
         other governing documents or any agreement or other instruments to
         which the Company is a party or by which the Company is bound.

             (d) Warrants, Preemptive Rights, Etc. Except as set forth in or
                 --------------------------------
         contemplated by the Term Sheet, there are not, nor will there be
         immediately after the Closing (as hereinafter defined), any outstanding
         warrants, options, agreements, convertible securities, rights of first
         refusal, rights of first offer, preemptive rights or other rights to
         subscribe for or to purchase or other commitments pursuant to which the
         Company is, or may become, obligated to issue any shares of its capital
         stock or other securities of the Company and this offering will not
         cause any anti-dilution adjustments to such securities or commitments
         except as reflected in the Term Sheet.
<PAGE>
         Paramount Capital, Inc. 
         Page 5

             (e) Subsidiaries and Investments. The Company has no subsidiaries
                 ----------------------------
         and the Company does not own, directly or indirectly, any capital stock
         or other equity ownership or proprietary interests in any other
         corporation, association, trust, partnership, joint venture or other
         entity.

             (f)    Financial Statements. The financial information contained in
                    --------------------
         the Offering Documents is accurate in all material respects. The
         Financial Statements have been prepared in conformity with generally
         accepted accounting principles consistently applied and show all
         material liabilities, absolute or contingent, of the Company required
         to be recorded thereon and present fairly the financial position and
         results of operations of the Company as of the dates and for the
         periods indicated.

             (g) Absence of Changes. Since the date of the Term Sheet, except as
                 ------------------
         has been or will be reflected in the Term Sheet prior to Closing, the
         Company has not incurred any liabilities or obligations, direct or
         contingent, not in the ordinary course of business, or entered into any
         transaction not in the ordinary course of business, which is material
         to the business of the Company, and there has not been any change in
         the capital stock of, or any incurrence of long-term debt by, the
         Company, or any issuance of options, warrants or other rights to
         purchase the capital stock of the Company, or any adverse change or any
         development involving, so far as the Company can now reasonably
         foresee, a prospective adverse change in the condition (financial or
         otherwise), net worth, results of operations, business, key personnel
         or properties which would be material to the business or financial
         condition of the Company, and the Company has not become a party to,
         and neither the business nor the property of the Company has become the
         subject of, any material litigation whether or not in the ordinary
         course of business.

             (h) Title. The Company has good and marketable title to all
                 -----
         tangible properties and assets owned by it, free and clear of all
         liens, charges, encumbrances or restrictions, except such as are not
         materially significant or important in relation to the Company's
         business; all of the material leases and subleases under which the
         Company is the lessor or sublessor of properties or assets or under
         which the Company holds properties or assets as lessee or sublessee are
         in full force and effect, and the Company is not in default in any
         material respect with respect to any of the terms or provisions of any
         of such leases or subleases, and no material claim has been asserted by
         anyone adverse to rights of the Company as lessor, sublessor, lessee or
         sublessee under any of the leases or subleases mentioned above, or
         affecting or questioning the right of the Company to continued
         possession of the leased or subleased premises or assets under any such
         lease or sublease. The Company owns or leases all such tangible
         properties as are necessary to its operations as now conducted and to
         be conducted, as presently planned.
<PAGE>
         Paramount Capital, Inc. 
         Page 6

             (i)    Proprietary Rights. To the best of the Company's knowledge
                    ------------------
         and except as has been or will be reflected in the Term Sheet prior to
         Closing, the Company owns or possesses adequate and enforceable rights
         to use all patents, patent applications, trademarks, service marks,
         trade names, corporate names, copyrights, trade secrets, processes,
         mask works, licenses, inventions, formulations, technology or know-how
         or other intangible property used or proposed to be used in the conduct
         of its business as described in or contemplated by the Term Sheet (the
         "Proprietary Rights"). To the best of the Company's knowledge and
         except as has been or will be reflected in the Term Sheet prior to
         Closing, the Company or the entities from whom the Company has acquired
         rights has taken all necessary action to protect all of its Proprietary
         Rights. Except as set forth in the Term Sheet, the Company has not
         received any notice of, and there are not any facts known to the
         Company which indicate the existence of (i) any infringement or mis-
         appropriation by any third party of any of the Proprietary Rights or
         (ii) any claim by a third party contesting the validity of any of the
         Proprietary Rights; the Company has not received any notice of any
         infringement, misappropriation or violation by the Company or any of
         its employees of any Proprietary Rights of third parties, and, to the
         best of the Company's knowledge, the Company nor any of its employees
         has infringed, misappropriated or otherwise violated any Proprietary
         Rights of any third parties; and, to the best of the Company's
         knowledge, no infringement, illicit copying, misappropriation or
         violation of any intellectual property rights of any third party has
         occurred or will occur with respect to any products currently being
         sold by the Company or with respect to any products currently under
         development by the Company or with respect to the conduct of the
         Company's business as currently contemplated. Except as described in
         the Term Sheet, the Company is not aware that any of its employees are
         obligated under any contract (including licenses, covenants or
         commitments of any nature) or other agreement, or subject to any
         judgment, decree or order of any court or administrative agency, that
         would interfere with the use of the employee's best efforts to promote
         the interests of the Company or that would conflict with the Company's
         business as proposed to be conducted. To the best of the Company's
         knowledge, neither the execution nor delivery of this Agreement, nor
         the carrying on of the Company's business by the employees of the
         Company, nor the conduct of the Company's business, as proposed, will
         conflict with or result in a breach of the terms, conditions or
         provisions of, or constitute a default under, any contract, covenant or
         instrument under which any such employee is now obligated.

             (j )    Litigation. Except as set forth in the Term Sheet, there is
                     ----------
         no material action, suit, claim or proceeding at law or in equity, or
         to the Company's knowledge, investigation or customer complaint, by or
         before any arbitrator, governmental instrumentality or other agency now
         pending or, to the knowledge of the Company, threatened against the
         Company (or basis therefor known to the Company which the Company
         believes will result in the foregoing) the adverse outcome of which
         would materially adversely affect the Company's business or prospects.
         The Company is not subject to any judgment, order, writ, injunction or
         decree of any Federal, state, municipal or other governmental
         department,
<PAGE>
         Paramount Capital, Inc. 
         Page 7

         commission, board, bureau, agency or instrumentality, domestic or
         foreign which would materially adversely affect the Company' s business
         or prospects.

             (k) Non-Defaults, Non-Contravention. The Company is not in
                 -------------------------------
         violation of or default under, nor will the execution and delivery of
         this Agreement or any of the Offering Documents and the Escrow
         Agreement, or consummation of the transactions contemplated herein or
         therein result in a violation of or constitute a default in the
         performance or observance of any obligation (i) under its Certificate
         of Incorporation, or its By-laws, or any indenture, mortgage, contract,
         material purchase order or other agreement or instrument to which the
         Company is a party or by which it or its property is bound or affected
         or (ii) with respect to any material order, writ, injunction or decree
         of any court of any Federal, state, municipal or other governmental
         department, commission, board, bureau, agency or instrumentality,
         domestic or foreign, and there is no existing condition, event or act
         which constitutes, nor which after notice, the lapse of time or both,
         could constitute a default under any of the foregoing, which in either
         case would have a material adverse effect on the business, financial
         condition or prospects of the Company.

             (1)    Taxes. The Company has filed all Federal, state, local and
                    -----
         foreign tax returns which are required to be filed by it and all such
         returns are true and correct in all material respects. The Company has
         paid all taxes pursuant to such returns or pursuant to any assessments
         received by it or which it is obligated to withhold from amounts owing
         to any employee, creditor or third party. The Company has properly
         accrued all taxes required to be accrued. The tax returns of the
         Company have never been audited by any state, local or Federal
         authorities (except for an audit by state authorities which has been
         concluded and all liabilities in connection therewith paid). The
         Company has not waived any statute of limitations with respect to taxes
         or agreed to any extension of time with respect to any tax assessment
         or deficiency.

             (m) Compliance With Laws, Licenses, Etc. The Company has not
                 -----------------------------------
         received notice of any violation of or noncompliance with any Federal,
         state, local or foreign, laws, ordinances, regulations and orders
         applicable to its business which has not been cured, the violation of,
         or noncompliance with which, would have a materially adverse effect on
         the business or operations of the Company. The Company has all
         governmental licenses and permits and other governmental certificates,
         authorizations and permits and approvals (collectively, "Licenses")
         required by every Federal, state and local government or regulatory
         body for the operation of its business as currently conducted and the
         use of its properties, except where the failure to be licensed would
         not have a material adverse effect on the business of the Company. The
         Licenses are in full force and effect and no violations are or have
         been recorded in respect of any License and no proceeding is pending or
         threatened to revoke or limit any thereof.
<PAGE>
         Paramount Capital, Inc. 
         Page 8

             (n) Authorization of Documents and Units. Each of the Offering
                 ------------------------------------
         Documents and the Escrow Agreement have been duly and validly
         authorized, executed and delivered by the Company and the execution,
         delivery and performance by the Company of the Offering Documents and
         the Escrow Agreement have been duly authorized by all requisite
         corporate action by the Company and when delivered, constitute or will
         constitute the legal, valid and binding obligations of the Company,
         enforceable in accordance with their respective terms, subject to the
         availability and enforceability of equitable remedies and to applicable
         bankruptcy and other laws relating to the rights of creditors generally
         and except as the enforcement of the rights to indemnification and
         contribution hereunder and under any other Offering Documents may be
         limited by federal or state securities laws or public policy. The
         Corporation has full power and lawful authority to authorize, issue and
         sell the Units to be sold to the Purchasers.

             (o) Exemption from Registration. Assuming (i) the accuracy of the
                 ---------------------------
         information provided by the respective Subscribers in the Subscription
         Agreements, (ii) that the Placement Agent has complied in all material
         respects with the provisions of Regulation D promulgated under the
         Securities Act and (iii) the timely filing of a Form D by the Company,
         the offer and sale of the Units pursuant to the terms of this Agreement
         are exempt from the registration requirements of the Securities Act and
         the rules and regulations promulgated thereunder (the "Regulations").
         The Company is not disqualified from the exemption under Regulation D
         by virtue of the disqualifications contained in Rule 505(6)(2)(iii) or
         Rule 507 promulgated thereunder.

             (p) Registration Rights. Except with respect to holders of the
                 -------------------
         Units, and except as set forth in the Term Sheet or disclosed to the
         Placement Agent in writing, no person has any right to cause the
         Company to effect the registration under the Securities Act of any
         securities of the Company.

             (q) Brokers. Neither the Company nor any of its officers,
                 -------
         directors, employees or stockholders has employed any broker or finder
         in connection with the transactions contemplated by this Agreement
         other than the Placement Agent.

             (r)    Title to Units. When certificates representing the
                    --------------
         securities comprising the Units shall have been duly delivered to the
         purchasers and payment shall have been made therefor, the several
         purchasers shall have good and marketable title to the Common Stock
         free and clear of all liens, encumbrances and claims whatsoever (with
         the exception of claims arising through the acts of the purchasers and
         except as arising from applicable Federal and state securities laws),
         and the Company shall have paid all taxes, if any, in respect of the
         original issuance thereof.
<PAGE>
         Paramount Capital, Inc. 
         Page 9

             (s)    Non-Affiliated Directors. The Company's Board of Directors
                    ------------------------
         has not less than two directors who are independent from, and
         unaffiliated with, management of the Company.

             (t)    Accuracy of Reports. All material reports required to be
                    -------------------
         filed by the Corporation within the two years prior to the date of this
         Agreement under the Securities and Exchange Act of 1934, as amended,
         have been duly filed with the SEC, complied at the time of filing in
         all material respects with the requirements of their respective forms
         and, except to the extent updated or superseded by the Term Sheet or
         any subsequently filed report, were complete and correct in all
         material respects as of the dates at which the information was
         furnished, and contained (as of such dates) no untrue statement of a
         material fact or omitted to state a material fact necessary in order to
         make the statements contained therein, in light of the circumstances
         under which they were made, not misleading.

             3.    Representations and Warranties of Paramount Capital, Inc. The
                   --------------------------------------------------------
         Placement Agent represents and warrants as follows:

             (a) The Placement Agent is duly organized and validly existing and
         in good standing as a corporation under the laws of the State of New
         York with full and adequate power and authority to enter into and
         perform this Agreement.

             (b) In offering the Units, the Placement Agent will deliver (or
         direct the Company to deliver) to each prospective purchaser, prior to
         accepting any subscription from such prospective purchaser, the
         Offering Documents, and will not offer any of the Units for sale, or
         solicit any offers to subscribe for any Units, or otherwise approach or
         negotiate with any person in respect of the Units, on the basis of any
         written information except the Offering Documents and any cover or
         transmittal letter therefor, and any other documents approved for such
         use by the Company or counsel to the Company. The Placement Agent will
         cooperate with the Company in the preparation of the Offering
         Documents, will exercise reasonable care to ensure that prospective
         purchasers for Units are not underwriters within the meaning of Section
         2(11) of the Act and will not engage in a general solicitation or
         employ general advertising in connection with the Offering.

             (c)    The Placement Agent will conduct the Offering in compliance
         with applicable federal and state securities laws so as to preserve the
         exemption provided in Section 4(2) of the Act and any applicable rules
         or regulations promulgated thereunder or under such state securities
         laws and will make offers to sell Units to, or solicit offers to
         subscribe for any Units from, persons in only those states where the
         Company has informed the Placement Agent in writing that the Offering
         and the Units have been qualified, or the Company has determined that
         an exemption from such qualification is available, under the applicable
         state securities statute. The Placement Agent will accept subscriptions
         only from persons that the
<PAGE>
         Paramount Capital, Inc. 
         Page 10

         Placement Agent reasonably believes are "accredited investors" (as
         defined in Regulation D under the Securities Act of 1933, as amended).
         The final acceptance of any subscription shall be made only after the
         Company has reviewed the Subscription Agreement and agreed to such
         final acceptance.

             (d) The Placement Agent will maintain a record for the period
         specified in Rule 17a-4 promulgated by the Securities and Exchange
         Commission (the "Commission") under the Act, or such longer period, if
         any, required by relevant state regulatory authorities, of all
         information obtained by the Placement Agent indicating that prospective
         purchasers for Units meet applicable suitability standards and any
         other information required thereby, which information shall be
         available to the Company at its reasonable request, and at each closing
         the Placement Agent will deliver to the Company the original copies of
         all accepted Subscription Agreements and have no reason to believe that
         said information and the representations of each Purchaser as set forth
         in the Subscription Agreement executed thereby are untrue.

             (e) The Placement Agent is, and at each closing will be, a
         securities broker-dealer registered with the Commission and any
         jurisdiction where broker-dealer registration is required in order to
         offer and sell the Units and a member in good standing of the National
         Association of Securities Dealers, Inc. ("NASD ").

             (f)       There is  no material  litigation,  governmental or  NASD
         proceeding, pending or, to the best of the Placement Agent's knowledge,
         threatened against the Placement Agent or any controlling person of the
         Placement  Agent that  involves  allegations  of  improper  or  illegal
         conduct under federal or state securities laws.

             (g) The Placement Agent will handle, transmit and deposit all funds
         from the sale of Units in accordance with the requirements of Rule 15c-
         2(4) promulgated under the Act.

             (h) The information, relating to the Placement Agent, provided by
         the Placement Agent to the Company in writing specifically for
         inclusion in the Offering Documents, as of the Closing Date, will not
         contain any untrue statement of a material fact or omit to state any
         material fact required to be stated therein or necessary to make the
         statements therein not misleading, all in light of the circumstances
         under which they were made.
<PAGE>
         Paramount Capital, Inc.
         page 11


              4.    Closing; Placement and Fees.
                    ----------------------------

              (a)       Closing.  Provided that at least 25 Units have been
                        -------
         subscribed for and funds representing the sale thereof shall have
         cleared, a closing (the "Closing") shall take place at the offices of
         the Placement Agent, 375 Park Avenue, New York, N.Y. on the Termination
         Date (which date may be accelerated or adjourned by agreement between
         the Company and the Placement Agent).  At the Closing, payment for the
         Units issued and sold by the Company shall be made to the Company in
         immediately available funds against delivery of certificates evidencing
         the Common Stock comprising such Units.

              (b)       Conditions to Placement Agent's Obligations.  The 
                        -------------------------------------------
         obligation of the Placement Agent hereunder will be subject to the
         accuracy of the representation and warranties of the Company herein
         contained as of the date hereof and as of each Closing Date, to the
         performance by the Company of its obligations hereunder and to the
         following additional conditions:

              (i)       Due Qualification or Exemption.  (A) The offering
                        ------------------------------
         contemplated by this Agreement will become qualified or be exempt from
         qualification under the securities laws of the several states pursuant
         to paragraph 4(c) below not later than the Closing Date, subject to any
         filings to be made thereafter, and (B) at the Closing Date no stop
         order suspending the sale of the Units shall have been issued, and no
         proceeding for that purpose shall have been initiated or threatened;

              (ii)      No Material Misstatements.  Neither the Blue Sky
                        -------------------------
         qualification materials nor the Term Sheet, nor any supplement thereto,
         will contain an untrue statement of a fact which in opinion of the
         Placement Agent is material, or omit to state a fact, which in the
         opinion of the Placement Agent is material and is required to be stated
         therein, or is necessary to make the statements therein, in light of
         the circumstances under which they were made, not misleading;

              (iii)     Compliance with Agreement.  The Company will have
                        -------------------------
         complied with all agreements and satisfied all conditions on its part
         to be performed or satisfied hereunder at or prior to each Closing.

              (iv)      Corporate Action.  The Company will have taken all
                        ----------------
         necessary corporate action, including, without limitation, obtaining
         the approval of the Company's board of directors, for the execution and
         delivery of the Offering Documents, the performance by the Company of
         its obligations hereunder and the offering contemplated hereby;
<PAGE>
         Paramount Capital, Inc. 
         Page 12

             (v)      Opinion of Counsel. The Placement Agent shall receive the
                      ------------------
         opinion of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. (stating
         that each of the purchasers may rely thereon as though addressed
         directly to such purchaser), dated the Closing, substantially to the
         effect that:

             (A) the Company is duly organized and is validly existing and in
         corporate good standing under the laws of the State of Delaware, has
         all requisite corporate power and authority necessary to own or hold
         its properties and conduct its business as described in the Term Sheet
         and is duly qualified or licensed to do business as a foreign
         corporation and is in good standing in the State of North Carolina and
         in each other jurisdiction in which the nature of the business
         conducted, by it or the properties owned, leased or operated by it,
         makes such qualification or licensing necessary or where the failure to
         be so qualified or licensed would have a material adverse effect upon
         the Company. The Company has no subsidiaries and the Company does not
         own, directly or indirectly, any capital stock or other equity
         ownership or proprietary interests in any other corporation,
         association, trust, partnership, joint venture or other entity;

             (B) the execution, delivery and performance of each of the Offering
         Documents, including the issuance of the Units, have been duly
         authorized by all necessary corporate action on the part of the
         Company. Each of the Offering Documents has been duly executed and
         delivered by the Company and constitutes a legal, valid and binding
         obligation of the Company enforceable in accordance with its terms,
         except as such enforceability may be limited by applicable bankruptcy,
         insolvency, reorganization, moratorium or other laws of general
         application relating to or affecting enforcement of creditors' rights
         and the application of equitable principles in any action, legal or
         equitable, and except as rights to indemnity or contribution may be
         limited by applicable law. Such counsel shall not be required to
         express any opinion herein as to the availability of any equitable
         remedy upon breach of any of the agreements, documents or obligations
         referred to herein, or as to the enforceability of any indemnification
         provisions of any agreement, document or instrument referred to herein
         under any federal or state securities law;
             (C) the authorized, issued and outstanding capital stock of the
         Company as of the date hereof (before giving effect to the transactions
         contemplated by this Agreement) is as set forth in the Offering
         Documents (provided that the Offering Documents do not state that the
         Company has authorized Series B Convertible Preferred Stock and Series
         C Convertible Preferred Stock, of which no shares are outstanding and
         of which the Company's Board of Directors has authorized the retirement
         and resumption of the status of authorized but unissued shares of
         preferred stock, $.001 par value). There are no outstanding warrants,
         options, agreements, convertible securities, preemptive rights or other
         commitments to the best knowledge of such counsel pursuant to which the
         Company is, or may become, obligated to issue any shares of its capital
         stock or other securities of the Company other than as set forth in the
         Term Sheet. All of the issued shares of
<PAGE>
         Paramount Capital, Inc. 
         Page 13

         capital stock of the Company have been duly and validly authorized and
         issued, are fully paid and nonassessable and have not been issued in
         violation of the preemptlye rights of any security holder of the
         Company to the best knowledge of such counsel;

             (D) assuming (i) the accuracy of the information provided by the
         Subscribers in the Subscription Documents, (ii) that the Placement
         Agent has complied with the requirements of section 4(2) of the
         Securities Act (and the provisions of Regulation D promulgated
         thereunder) and (iii) the timely filing with the Securities and
         Exchange Commission of a Form D and amendments thereto containing
         accurate and complete information, the issuance and sale of the Units
         is exempt from registration under the Securities Act and Rule 506 of
         Regulation D promulgated thereunder;

             (E) neither the execution and delivery of the Offering Documents
         nor compliance with the terms hereof or thereof, nor the consummation
         of the transactions herein or therein contemplated, has, nor will,
         conflict with, result in a breach of, or constitute a default under the
         Certificate of Incorporation or By-laws of the Company, or any material
         contract, instrument or document to which the Company is a party, or by
         which it or any of its properties is bound or violate any applicable
         order or decree of any governmental agency or court having jurisdiction
         over the Company or any of its properties or business naming the
         Company and to the best knowledge of such counsel;

             (F) to such counsel's best knowledge, there are no claims,
         actions, suits, investigations or proceedings before or by any
         arbitrator, court, governmental authority or instrumentality pending or
         threatened against the Company which might materially and adversely
         affect the business, properties or financial condition of the Company
         or which might materially adversely affect the transactions or other
         acts contemplated by the Offering Documents or the validity or
         enforceability of the Offering Documents, except as set forth in or
         contemplated by the Offering Documents. Except as disclosed in the
         Offering Documents, to such counsel' s best knowledge, the Company is
         not a party or subject to the provisions of any order, writ,
         injunction, judgment or decree of any court or government agency or
         instrumentality naming the Company;

             (G) upon the issuance of Common Stock, each of the purchasers shall
         acquire such securities, free and clear of all pledges, liens, claims,
         encumbrances, preemptive rights, rights of first offer or right of
         first refusal and restrictions, to such counsel's best knowledge, and
         imposed by or through the Company, except for the transfer restrictions
         set forth in the Subscription Agreements and any action taken to
         encumber such securities by the holder itself;

             (H) the Common Stock has been duly authorized and reserved for
         issuance and, upon issuance in accordance with the terms of such
         instruments, will be validly issued, fully paid and non-assessable; and
<PAGE>
         Paramount Capital, Inc. 
         Page 14

             (I)    in course of the preparation of the Offering Documents,
         which involved, among other things, discussions and inquiries
         concerning the various legal matters and the review of certain
         corporate records, documents and proceedings, counsel participated in
         conferences with certain officers and other representatives of the
         Company and the Placement Agent during which the contents of the
         Offering Documents and related matters were discussed. On the basis of
         the information which was developed in the course thereof, such counsel
         shall advise the Placement Agent (which advice shall not be in the form
         of an opinion and is not required to be delivered to the purchasers)
         that such counsel has no reason to believe that as of the date of the
         Closing, the Term Sheet contained an untrue statement of a material
         fact relating to the Company or omitted to state a material fact
         relating to the Company required to be stated therein or necessary to
         make the statements therein not misleading in the light of the
         circumstances under which they were made in light of the circumstances
         under which they were made.

             Such counsel may state that the absence of any independent
         verification by such counsel of factual matters and the character of
         determinations involved in the securities laws disclosure process are
         such, however, that it does not assume responsibility for the accuracy,
         completeness or fairness of the statements made in the Term Sheet. Such
         counsel need not express any opinion or belief as to the financial
         statements and related schedules and the other financial and
         statistical data contained in the Term Sheet.

             (vi)      Comfort Letter. If requested by the Placement Agent, the
                       --------------
         Company shall cause the Company's independent public accountants to
         address and deliver to the Company and the Placement Agent a letter or
         letters (which letters are frequently referred to as "Comfort Letters")
         dated as of the Closing Date and the effective date of the registration
         statement required to be filed in connection with the Subscription
         Agreements.

             (vii)     Officer's Certificate. The Placement Agent shall receive
                       ---------------------
         an Officer's Certificate substantially in the form of Exhibit A and a
         Secretary's Certificate substantially in the form of Exhibit B, signed
         by the appropriate parties and dated as of the Closing. These
         certificates shall state, among other things, that the representations
         and warranties contained in Section 2 hereof are true and accurate in
         all material respects at such Closing with the same effect as though
         expressly made at such Closing.

             (viii)     Escrow Agreement. The Placement Agent shall receive a
                        ----------------
         copy of a duly executed Escrow Agreement with the American Stock
         Transfer & Trust Company in the form previously delivered to you.

             (ix)      Lock-Up Agreement. Certain current stockholders,
                       -----------------
         directors and executive officers of the Company shall agree that, for a
         period of thirteen (13) months from the closing of the Offering, they
         will not sell,
<PAGE>
         Paramount Capital, Inc.
         Page 15

         assign or transfer any of their shares of the Company's securities
         without the Placement Agent's prior written consent.

             (x)      Transmittal Letters. The Placement Agent shall receive
                      -------------------
         copies of all letters from the Company to the investors transmitting
         the Common Stock and shall receive a letter from the Company confirming
         transmittal of the securities to the investors.

             (xi)     Transfer Sheets. For a period of three (3) years from the
                      ---------------
         Closing Date, the Company, at its expense, shall provide the Placement
         Agent with copies of the Company's daily transfer sheets, if requested
         by the Placement Agent.

             (c) Blue Sky. A summary blue sky survey, at the sole cost of the
                 --------
         Company (with legal fees and disbursements not to exceed $15,000),
         shall be prepared by counsel to the Placement Agent stating the extent
         to which and the conditions upon which offers and sales of the Units
         may be made in certain jurisdictions. It is understood that such survey
         may be based on or rely upon (i) the representations of each Subscriber
         set forth in the Subscription Agreement delivered by such Subscriber,
         (ii) the representations, warranties and agreements of the Company set
         forth in Section 2 of this Agreement, (iii) the representations and
         warranties of the Placement Agent, and (iv) the representations of the
         Company set forth in the certificate to be delivered at the Closing
         pursuant to paragraph (iii) of Section 3(b).

             (d) Placement Fee and Expenses. Simultaneously with payment for and
                 --------------------------
         delivery of the Units at each Closing as provided in paragraph 3(a)
         above, the Company shall at such Closing pay to the Placement Agent (i)
         a commission equal to ten percent (10%) of the aggregate purchase price
         of the Units sold and (ii) a non-accountable expense allowance equal to
         three percent (3 %) of the aggregate purchase price of the Units sold.
         The Company shall also pay all expenses in connection with the
         qualification of the Units under the securities or Blue Sky laws of the
         states which the Placement Agent shall designate (with legal fees and
         disbursements not to exceed $15,000). The Placement Agent shall be
         entitled to warrants to purchase Common Stock equal to 10% of the
         Common Stock sold in this Offering at an exercise price equal to 125%
         of the price per share of Common Stock sold to investors in the
         Offering, upon execution and delivery of a Warrant Purchase Agreement
         in a form reasonably acceptable to the Company.

             (e) No Adverse Changes. There shall not have occurred, at any time
                 ------------------
         prior to the Closing (i) any domestic or international event, act or
         occurrence which has materially disrupted, or in the Placement Agent's
         opinion will in the immediate future materially disrupt, the securities
         markets; (ii) a general suspension of, or a general limitation on
         prices for, trading in securities on the New York Stock Exchange or the
         American Stock Exchange or in the over-the-counter
<PAGE>
         Paramount Capital, Inc. 
         Page 16

         market; (iii) any outbreak of major hostilities or other national or
         international calamity; (iv) any banking moratorium declared by a state
         or federal authority; (v) any moratorium declared in foreign exchange  
         trading by major international banks or other persons; (vi) any 
         material interruption in the mail service or other means of 
         communication within the United States; (vii) any material adverse 
         change in the business, properties, assets, results of operations, or 
         financial condition of the Company; or (viii) any change in the market 
         for securities in general or in political, financial, or economic 
         conditions which, in the Placement Agent's reasonable judgment, makes 
         it inadvisable to proceed with the offering, sale, and delivery of the 
         Units.


                   5.    Covenants of the Company.
                         -------------------------

             (a) Use of Proceeds. The net proceeds of the Offering will be used
                 ---------------
         by the Company substantially as set forth in the Term Sheet. The
         Company shall not use any of the proceeds from the Offering to repay
         any indebtedness of the Company, including, but not limited to,
         indebtedness to any current executive officers, directors or principal
         stockholders of the Company.

             (b) Expenses of Offering. The Company shall be responsible for, and
                 --------------------
         shall bear all expenses directly incurred in connection with, the
         proposed Offering including, but not limited to, legal fees relating to
         the costs of preparing the Offering Documents and all amendments,
         supplements and exhibits thereto; preparing and delivering all
         placement agent and selling documents, including, but not limited to,
         the Agency Agreement with the Placement Agent and the blue sky
         memorandum; Common Stock certificates; blue sky fees, filing fees and
         the fees and disbursements of counsel in connection with blue sky
         matters (subject to the limit set forth in Section 3(c) hereof) (the
         "Company Expenses"). The Company shall pay to the Placement Agent a
         non-accountable expense allowance equal to three percent (3%) of the
         total proceeds of the Offering (the "Expense Allowance") of which
         $20,000 shall be due and payable upon the execution of the Letter of
         Intent, to cover the cost of our mailing, telephone, telegraph, travel,
         due diligence meetings and other similar expenses including legal fees
         of Placement Agent's counsel (other than legal fees in connection with
         blue sky matters as to which fees you shall be responsible (subject to
         the limit set forth in Section 3(c) hereof). Such prepaid expense
         allowances shall be non-refundable.

             (c) Notification. The Company shall notify the Placement Agent
                 ------------
         immediately, and in writing, (A) when any event shall have occurred
         during the period commencing on the date hereof and ending on the later
         of the Closing or the Termination Date as a result of which the
         Offering Documents would include any untrue statement of a material
         fact or omit to state any material fact required to be stated therein
         or necessary to make the statements therein not misleading in light of
         the circumstances under which they were made and (B) of the receipt of
         any notification with respect to the modification, rescission,
         withdrawal or suspension of
<PAGE>
         Paramount Capital, Inc. 
         Page 17

         the qualification or registration of the Units, or of any exemption
         from such registration or qualification, in any jurisdiction. The
         Company will use its best efforts to prevent the issuance of any such
         modification, rescission, withdrawal or suspension and, if any such
         modification, rescission, withdrawal or suspension is issued and you so
         request, to obtain the lifting thereof as promptly as possible.

             (d) Blue Sky. The Company will use its best efforts to qualify the
                 --------
         Units for offering and sale under exemptions from qualification or
         registration requirements under the securities or "blue sky" laws of
         such jurisdictions as you may reasonably request; provided however,
         that the Company will not be obligated to qualify as a dealer in
         securities in any jurisdiction in which it is not so qualified. The
         Company will not consummate any sale of Units in any jurisdiction in
         which it is not so qualified or in any manner in which such sale may
         not be lawfully made.

             (e) Registration Statement Filing. The Company covenants to use its
                 -----------------------------
         best efforts to file the Registration Statement relating to the
         Proposed Equity Financing (as defined in the Term Sheet) as soon as
         possible following the Closing of this Offering but in no event later
         than sixty (60) days after the Closing of this Offering, subject to the
         Placement Agent's cooperation.

             (f)    Form D Filing. The Company shall file five copies of a
                    -------------
         Notice of Sales of Securities on Form D with the Securities and
         Exchange Commission (the "Commission") no later than 15 days after the
         Closing. The Company shall file promptly such amendments to such
         Notices on Form D as shall become necessary and shall also comply with
         any filing requirement imposed by the laws of any state or jurisdiction
         in which offers and sales are made. The Company shall furnish the
         Placement Agent with copies of all such filings.

             (g) Press Releases, Etc. Except as otherwise required by applicable
                 -------------------
         law, the Company shall not, during the period commencing on the date
         hereof and ending thirty days after the later of the Closing and the
         Termination Date, issue any press release or other communication, or
         hold any press conference with respect to the Company, its financial
         condition, results of operations, business, properties, assets, or
         liabilities, or the Offering, without the prior written consent of the
         Placement Agent, which consent shall not be unreasonably withheld.

             (h) Public Documents. Following the Closing of the Offering, the
                 ----------------
         Company will furnish to the Placement Agent: (i) as soon as practicable
         (but in the case of the annual report of the Company to its
         stockholders, within 120 days after the end of each fiscal year of the
         Company) one copy of: (A) its annual report to its stockholders (which
         annual report shall contain financial statements audited in accordance
         with generally accepted accounting principles in the United States of
         America by a firm of certified public accountants of recognized
         standing), (B) if not included in substance in its annual report to
         stockholders, its annual report
<PAGE>
         Paramount Capital, Inc. 
         Page 18

         on Form 10-K, (C) each of its quarterly reports to its stockholders,
         and if not included in substance in its quarterly reports to
         stockholders, its quarterly report on Form 10-Q, (D) each of its
         current reports on Form 8-K, and (E) a copy of the full Registration
         Statement, if filed (the foregoing, in each case, excluding exhibits);
         and (ii) upon reasonable request, all exhibits excluded by the
         parenthetical to the immediately preceding clause 5(h)(i)(E) and all
         other information that is generally available to the public. In
         addition, the Company upon reasonable request will meet with the
         Placement Agent or its representatives to discuss all information
         relevant for disclosure in any Registration Statement covering shares
         purchased by purchasers from the Company and offered by them for resale
         and will cooperate in any reasonable investigation undertaken by the
         Placement Agent for the purpose of confirming the accuracy of the
         Registration Statement, including the production of information at the
         Company's offices.

             (i)    Restrictions on Securities. During the two years following
                    --------------------------
         the Closing of the Offering, the Company shall not, without the prior
         written consent of the Placement Agent, offer or sell any of its
         securities in reliance on Regulation S of the Securities Act, other
         than to non-U.S. employees of the Company or its subsidiaries. During
         the nine (9) month period following the completion of the Offering, (i)
         the Placement Agent shall have the right of first refusal to act as
         placement agent for the offering of any securities of the Company
         issued for fund raising purposes (excluding "firm commitment"
         underwritings, corporate partner arrangements and strategic alliances
         and other licensing transactions) and (ii) the Company will not extend
         the expiration date or decrease the exercise price of any options or
         warrants or other similar security purchase rights without the prior
         written consent of the Placement Agent (other than those issued
         pursuant to the Company's stock option plan or as required by the
         documents governing any such securities).

             (j)    Financial Advisory Agreement. At the Closing Date, the
                    ----------------------------
         Company and the Placement Agent will enter into an engagement agreement
         whereby the Placement Agent will act as the Company's non-exclusive
         financial advisor to assist the Company in identifying and negotiating
         one or more corporate or strategic alliances. Such engagement will
         provide that Paramount receive a monthly retainer of $3,000 (minimum
         engagement of twenty-four months), out-of-pocket expenses and standard
         success fees.

             (k) Board Designee. During the three years following the completion
                 --------------
         of the Offering, the Placement Agent shall have the right, at its
         option, to designate one director to the Board of Directors of the
         Company.

             (1)    Letter Agreements. The Placement Agent acknowledges that the
                    -----------------
         Company is a party to letter agreements (the "Letter Agreements") dated
         June  29, 1995  and  June 28,  1994  with Americorp  which  provide for
         Americorp Securities, Inc. ("Americorp") to  act as a financial advisor
         and for the payment of certain fees to
<PAGE>
         Paramount Capital, Inc. 
         Page 19

         be paid to Americorp in connection with certain transactions. Although
         the parties hereto do not believe that the Letter Agreements relate to
         the Offering, in the event that Americorp is owed and paid a fee
         pursuant the Letter Agreements on account of the transactions
         contemplated hereby, the Placement Agent agrees to reimburse the
         Company, solely out of and to the extent of Cash Commissions actually
         paid to the Placement Agent, for any such amounts actually paid to
         Americorp.

                   6.    Indemnification.
                         ----------------

             (a) The Company agrees to indemnify and hold harmless the Placement
         Agent and each Selected Dealer, if any, and their respective
         shareholders, directors, officers, agents and controlling persons
         within the meaning of the Act (an "Indemnified Party") against any and
         all loss, liability, claim, damage, liability and expense whatsoever
         (and all actions in respect thereof), and to reimburse the Placement
         Agent for legal fees and related expenses as incurred (including, but
         not limited to the costs of giving testimony or furnishing documents in
         response to a subpoena or otherwise, the costs of investigating,
         preparing or defending any such action or claim whether or not in
         connection with litigation in which the Placement Agent is a party), in
         so far as such loss, liability, claim, damage or expense arises out of
         any untrue statement or alleged untrue statement of a material fact
         contained in the Offering Documents or the omission or alleged omission
         therefrom of a material fact necessary in order to make the statements
         therein, in light of the circumstances under which they were made, not
         misleading, provided, however, that the Company will not be liable in
         any such case if and to the extent that any such loss, claim, damage,
         liability or expense arises out of or is based upon an untrue statement
         or alleged untrue statement or omission or alleged omission so made in
         conformity with information furnished by any such Indemnified Party in
         writing specifically for use in the Offering Documents;

             (b) The company agrees to indemnify and hold harmless an
         Indemnified Party to the same extent as the foregoing indemnity, and
         subject to the limitations set forth therein, against any and all loss,
         liability, claim, damage and expense whatsoever directly arising out of
         the exercise by any person of any right under the Securities Act or the
         Exchange Act or the securities or Blue Sky laws of any state on account
         of violations of the representations, warranties or agreements set
         forth in Section 2 hereof.

             (c) The Placement Agent agrees to indemnify and hold harmless the
         Company, the Company's directors, officers, employees and agents and
         each person who controls the Company within the meaning of Section 15
         of the Act or Section 20 of the Exchange Act and each and all of them,
         to the same extent as the foregoing indemnity from the Company to the
         Placement Agent, but only with reference to information, relating to
         the Placement Agent, furnished in writing to the Company by the
         Placement Agent specifically for inclusion in the Offering Documents.
<PAGE>
         Paramount Capital, Inc. 
         Page 20

             (d) Promptly after receipt by a person entitled to indemnification
         pursuant to the foregoing subsection (a), (b), (c) or (d) (an
         "indemnified party") under this Section of notice of the commencement
         of any action, the indemnified party will, if a claim in respect
         thereof is to be made against a person granting indemnification (an
         "indemnifying party") under this Section, notify in writing the
         indemnifying party of the commencement thereof; but the omission so to
         notify the indemnifying party will not relieve it from any liability
         which it may have to the indemnified party otherwise than under this
         Section. In case any such action is brought against an indemnified
         party, and it notifies the indemnifying party of the commencement
         thereof, the indemnifying party will be entitled to participate in,
         and, to the extent that it may wish, jointly with any other
         indemnifying party similarly notified, to assume the defense thereof,
         subject to the provisions herein stated, with counsel reasonably
         satisfactory to the indemnified party, and after notice from the
         indemnifying party to the indemnified party of its election so to
         assume the defense thereof, the indemnifying party will not be liable
         to the indemnified party under this Section for any legal or other
         expenses subsequently incurred by the indemnified party in connection
         with the defense thereof other than reasonable costs of investigation.
         The indemnified party shall have the right to employ separate counsel
         in any such action and to participate in the defense thereof, but the
         fees and expenses of such counsel shall not be at the expense of the
         indemnifying party if the indemnifying party has assumed the defense of
         the action with counsel reasonably satisfactory to the indemnified
         party; provided that the fees and expenses of such counsel shall be at
         the expense of the indemnifying party if (i) the employment of such
         counsel has been specifically authorized in writing by the indemnifying
         party or (ii) the named parties to any such action (including any
         impleaded parties) include both the indemnified party or parties and
         the indemnifying party and, in the judgment of the indemnified party,
         it is advisable for the indemnified party or parties to be represented
         by separate counsel (in which case the indemnifying party shall not
         have the right to assume the defense of such action on behalf of the
         indemnified party or parties, it being understood, however, that the
         indemnifying party shall not, in connection with any one such action or
         separate but substantially similar or related actions in the same
         jurisdiction arising out of the same general allegations or
         circumstances, be liable for the reasonable fees and expenses of more
         than one separate firm of attorneys for the indemnified party or
         parties. No settlement of any action against an indemnified party shall
         be made without the consent of the indemnified party, which shall not
         be unreasonably withheld in light of all factors of importance to the
         indemnified party.


                   7.    Contribution.
                         ------------

             (a) To provide for just and equitable contribution, if (i) an
         indemnified party makes a claim for indemnification pursuant to Section
         6 but it is found in a final judicial determination, by a court of
         competent jurisdiction, not subject to further appeal, that such
         indemnification may not be enforced in such case, even though this
         Agreement expressly provides for indemnification in such case, or (ii)
         any indemnified or indemnifying party seeks contribution under the
         Securities Act,
<PAGE>
         Paramount Capital, Inc. 
         Page 21

         the Exchange Act, or otherwise, then the Company (including for this
         purpose any contribution made by or on behalf of any officer, director,
         employee or agent for the Company, or any controlling person of the
         Company), on the one hand, and the Placement Agent and any Selected
         Dealers (including for this purpose any contribution by or on behalf of
         an indemnified party), on the other hand, shall contribute to the
         losses, liabilities, claims, damages, and expenses whatsoever to which
         any of them may be subject, in such proportions as are appropriate to
         reflect the relative benefits received by the Company, on the one hand,
         and the Placement Agent and the Selected Dealers, on the other hand;
         provided, however, that if applicable law does not permit such
         allocation, then other relevant equitable considerations such as the
         relative fault of the Company and the Placement Agent and the Selected
         Dealers in connection with the facts which resulted in such losses,
         liabilities, claims, damages, and expenses shall also be considered. In
         no case shall the Placement Agent or a Selected Dealer be responsible
         for a portion of the contribution obligation in excess of the
         compensation received by it pursuant to Section 3 hereof or the
         Selected Dealer Agreement, as the case may be. No person guilty of a
         fraudulent misrepresentation shall be entitled to contribution from any
         person who is not guilty of such fraudulent misrepresentation. For
         purposes of this Section 7, each person, if any, who controls the
         Placement Agent or a Selected Dealer within the meaning of Section 15
         of the Securities Act or Section 20(a) of the Exchange Act and each
         officer, director, stockholder, employee and agent of the Placement
         Agent or a Selected Dealer, shall have the same rights to contribution
         as the Placement Agent or the Selected Dealer, and each person, if any
         who controls the Company within the meaning of Section 15 of the
         Securities Act or Section 20(a) of the Exchange Act and each officer,
         director, employee and agent of the Company, shall have the same rights
         to contribution as the Company, subject in each case to the provisions
         of this Section 7. Anything in this Section 7 to the contrary
         notwithstanding, no party shall be liable for contribution with respect
         to the settlement of any claim or action effected without its written
         consent. This Section 7 is intended to supersede any right to
         contribution under the Securities Act, the Exchange Act, or otherwise.

             (b) Notwithstanding the provisions of this Agreement, the aggregate
         indemnification or contribution of the Placement Agent for or on
         account of any losses, claims, damages, liabilities or actions shall
         not exceed the Selling Commissions paid to the Placement Agent. The
         respective indemnity and contribution agreements by the Company and the
         Placement Agent contained in subsections (a), (b), (c) and (d) of
         Section 6 and this Section 7, and the covenants, representations and
         warranties of the Company and the Placement Agent set forth in Sections
         1, 2, 3, 4 and 5 shall remain operative and in full force and effect
         regardless of (i) any investigation made by the Placement Agent, on the
         Placement Agent's behalf or by or on behalf of any person who controls
         the Placement Agent, the Company or any controlling person of the
         Company or any director or officer of the Company, (ii) acceptance of
         any of the Units and payment therefor or (iii) any termination of this
         Agreement, and shall survive the delivery of the Units, and any
         successor of the
<PAGE>
         Paramount Capital, Inc. 
         Page 22

         Placement Agent or of the Company or of any person who controls the
         Placement Agent or the Company, as the case may be, shall be entitled
         to the benefit of such respective indemnity and contribution
         agreements. The respective indemnity and contribution agreements by the
         Company and the Placement Agent contained in subsections (a), (b) and
         (c) of Section 6 and this Section 7 shall be in addition to any
         liability which the Company and the Placement Agent may otherwise have.

                   8.    Miscellaneous.
                         -------------

             (a) Survival. Any termination of the Offering without consummation
                 --------
         thereof shall be without obligation on the part of any party except
         that the indemnification provided in Section 6 hereof and the
         contribution provided in Section 7 hereof shall survive any termination
         and shall survive the Closing for a period of five years.

             (b) Representations, Warranties and Covenants to Survive Delivery.
                 --------------------------------------------------------------
         The respective representations, warranties, indemnities, agreements,
         covenants and other statements of the Company and the Placement Agent
         as of the date hereof shall survive execution of this Agreement and
         delivery of the Units and the termination of this Agreement.

             (c) No Other Beneficiaries. This Agreement is intended for the sole
                 ----------------------
         and exclusive benefit of the parties hereto and their respective
         successors and controlling persons, and no other person, firm or
         corporation shall have any third-party beneficiary or other rights
         hereunder.

             (d) Governing Law. This Agreement shall be governed by and
                 -------------
         construed in accordance with the law of the State of New York without
         regard to conflict of law provisions.

             (e) Counterparts. This Agreement may be signed in counterparts with
                 ------------
         the same effect as if both parties had signed one and the same
         instrument.

             (f)    Notices. Any communications specifically required hereunder
                    -------
         to be in writing, if sent to the Placement Agent, will be mailed,
         delivered and confirmed to it at Paramount Capital, 375 Park Avenue,
         Suite 1501, New York, New York, 10023, Att: Michael S. Weiss and if
         sent to the Company, will be mailed, delivered or telegraphed and
         confirmed to it at Sparta Pharmaceuticals, Inc., Westpark Corporate
         Center, Suite 110, 4364 S. Alston Ave., Durham, NC, 27713, Att: Chief
         Executive Officer, with a copy to Mintz, Levin, Cohn, Ferris, Glovsky
         and Popeo, P.C., One Financial Center, Boston, MA, 02111, Att:
         Elizabeth P. Knauss, Esq.
<PAGE>
         Paramount Capital, Inc. 
         Page 23

             (g)  Termination. Subject  to the  general  survival provisions  of
                  -----------
         Sections  8(a) and  8(b), this  Agreement may  be terminated  by either
         party prior to any Closing upon written notice to the other party.

             (h) Entire Agreement. This Agreement constitutes the entire
                 ----------------
         agreement of the parties with respect to the matters herein referred
         and supersedes all prior agreements and understandings, written and
         oral, between the parties with respect to the subject matter hereof.
         Except as this Agreement pertains to the Offering, the Letter of Intent
         dated January 10, 1996 between the parties, including without
         limitation, paragraph 15, is not superseded. Neither this Agreement nor
         any term hereof may be changed, waived or terminated orally, but only
         by an instrument in writing signed by the party against which
         enforcement of the change, waiver or termination is sought.

             (i)    Nothing contained herein or otherwise shall create a
         partnership or join venture between you and the Company.

             (j)    The headings and captions of the various subdivisions of
         this Agreement are for convenience or reference only and shall in no
         way modify or affect the meaning or construction of any of the terms or
         provisions hereof.
<PAGE>
         Paramount Capital, Inc. 
         Page 24

             If you find the foregoing is in accordance with our understanding,
         kindly sign and return to us a counterpart hereof, whereupon this
         instrument along with all counterparts will become a binding agreement
         between us.

                                       Very truly yours,

                                       SPARTA PHARMACEUTICALS, INC.


                                       By:  /s/ William M. Sullivan 
                                            ------------------------------------
                                            Name: William M. Sullivan 
                                            Its: Chief Executive Officer

         Agreed to by:

         PARAMOUNT CAPITAL, INC.


         By:  /s/ Lindsay A. Rosenwald, M.D. 
              --------------------------------
              Name: Lindsay A. Rosenwald, M.D. 
              Its:  Chairman
<PAGE>
         Paramount Capital, Inc. 
         Page 25

                                  Schedule I

         1. William M. Sullivan 

         2. Lindsay A. Rosenwald



Exhibit 11.1

<TABLE><CAPTION>
                                               Sparta Pharmaceuticals, Inc.
                                               (A Development Stage Company)

                                             Computation of Earnings Per Share


                                                                                           Period From   
                                                    For the three months                  June 12, 1990  
                                                       ended March 31                    (Inception) to  
                                                  -----------------------                March 31, 1996
                                                     1996          1995                  --------------
                                                     ----          ----
<S>                                              <C>           <C>                       <C>

Net loss                                         $3,649,561    $(574,163)                 $(13,667,017)
                                                 ===========   ==========                 =============

Historical weighted average number of shares                                                           
used in per share calculations(1)                6,559,557     6,142,372                      3,494,946

Convertible Preferrred Stock and Convertible                                                  1,434,598
                                                                                             ----------
Notes

Supplemental weighted average shares                                                          4,929,544
                                                                                             ==========
Historical Net Loss per share                    $    (.56)    $   (0.09)                    $   (3.91)
                                                 ==========    ==========                    ----------

Supplemental Net Loss per share                                                              $   (2.77)
                                                                                             ==========


(1) Historical weighted average shares outstanding include the following:

                                                               

Common Stock outstanding for the period based                         
on a daily weighted average                      6,559,557     6,142,372                      3,445,120

Common Stock issued within one year of the                                                             
initial filing used the treasury stock method*                                                    4,232

Common Stock Options*                                                                               725

Common Stock Warrants*                                                                           44,869
                                                 ---------     ---------                      ---------

Historical weighted average number of shares     6,559,557     6,142,372                      3,494,946
outstanding                                      =========     =========                      =========


*Included as outstanding pursuant to SAB 83. See Note 2 of Notes to Financial Statements.

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>

                             Sparta Pharmaceuticals, Inc.

This schedule contains summary financial information extracted from 
the Financial Statements included in the Company's March 31, 1996 report on 
Form 10-Q and is qualified in its entirety by reference to such 
financial statements.

</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                       2,697,862
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             2,845,393
<PP&E>                                         623,445
<DEPRECIATION>                                  43,420
<TOTAL-ASSETS>                               3,731,553
<CURRENT-LIABILITIES>                          393,433
<BONDS>                                              0
                                0
                                        300
<COMMON>                                         8,186
<OTHER-SE>                                   3,329,634
<TOTAL-LIABILITY-AND-EQUITY>                 3,731,553
<SALES>                                              0
<TOTAL-REVENUES>                                18,713
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             3,668,274
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                            (3,649,561)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (3,649,561)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (3,649,561)
<EPS-PRIMARY>                                    (.56)
<EPS-DILUTED>                                    (.56)
        


</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission