PERARDUA CORP
SB-2/A, 1997-04-24
PHARMACEUTICAL PREPARATIONS
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     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 24, 1997
                                                      REGISTRATION NO. 333-21209
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 ---------------
                               AMENDMENT NO. 1 TO
                                    FORM SB-2
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                 ---------------
                              PERARDUA CORPORATION
                 (NAME OF SMALL BUSINESS ISSUER IN ITS CHARTER)


                                 ---------------
            DELAWARE                                            62-1667690      
  (STATE OR OTHER JURISDICTION                               (I.R.S. EMPLOYER   
      OF INCORPORATION OR                                   IDENTIFICATION NO.)
          ORGANIZATION)                                     
                                      2836
                          (PRIMARY STANDARD INDUSTRIAL
                           CLASSIFICATION CODE NUMBER)
                                                                     
                                 ---------------
                                                                 
                      


                                
          PERARDUA CORPORATION                        SAMUEL P. SEARS, JR.    
   10940 WILSHIRE BOULEVARD, SUITE 1600               PERARDUA CORPORATION    
      LOS ANGELES, CALIFORNIA 90024                  16 SOUTH MARKET STREET   
            (310) 443-4240                         PETERSBURG, VIRGINIA 23803 
    (ADDRESS AND TELEPHONE NUMBER OF                     (804) 861-0681         
      PRINCIPAL EXECUTIVE OFFICES)                (NAME, ADDRESS AND TELEPHONE
                                                   NUMBER OF AGENT FOR SERVICE)

                              PERARDUA CORPORATION
                      10940 WILSHIRE BOULEVARD, SUITE 1600
                          LOS ANGELES, CALIFORNIA 90024
                                 (310) 443-4240
                     (ADDRESS OF PRINCIPAL PLACE OF BUSINESS
                    OR INTENDED PRINCIPAL PLACE OF BUSINESS)
              
                                 ---------------

                          COPIES OF COMMUNICATIONS TO:

      J. BENJAMIN ENGLISH, ESQ.                     WILLIAM M. PRIFTI, ESQ.   
LECLAIR RYAN, A PROFESSIONAL CORPORATION         LYNNFIELD WOODS OFFICE PARK  
   707 EAST MAIN STREET, SUITE 1100                220 BROADWAY, SUITE 204    
       RICHMOND, VIRGINIA 23219                 LYNNFIELD, MASSACHUSETTS 01940
           (804) 783-2003                               (617) 593-4525        
                                               
                                 ---------------
                                                
                                                
                                                
                                                


   
    APPROXIMATE  DATE OF PROPOSED SALE TO THE PUBLIC:  As soon as practicable on
or after the effective date of this Registration Statement.

    If any of the securities  being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, check the following box: [x]

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

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

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


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


    THE  REGISTRANT  HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE  COMMISSION,  ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.
================================================================================




                   SUBJECT TO COMPLETION, DATED APRIL 24, 1997
    

PROSPECTUS

                           PERARDUA CORPORATION
                     1,000,000 SHARES OF COMMON STOCK
                       1,000,000 REDEEMABLE WARRANTS

    PerArdua  Corporation  ("PerArdua"  or the  "Company")  hereby  offers  (the
"Offering")  1,000,000 shares of the Company's common stock,  $.01 par value per
share (the "Common Stock"),  and 1,000,000  Redeemable Warrants (the "Redeemable
Warrants").  The Common Stock and the  Redeemable  Warrants  offered  hereby are
sometimes  hereinafter  collectively  referred  to  as  the  "Securities."  Each
Redeemable  Warrant entitles the holder to purchase one share of Common Stock at
a price of $6.50  per  share  beginning  , 1998 and  ending , 2002,  unless  the
Redeemable  Warrants  are  redeemed  by the  Company  as  provided  herein.  The
Redeemable  Warrants are redeemable by the Company at a redemption  rate of $.20
per Redeemable Warrant at any time commencing , 1998 upon 30 days' prior written
notice,  provided  that the average  closing bid price of the  Company's  Common
Stock equals or exceeds $9.00 per share for a 20 consecutive trading day period.
See "DESCRIPTION OF SECURITIES."

    Prior to the Offering,  no public market for the  Securities  existed and no
assurance can be given that any such market will develop after the completion of
the  Offering  or,  that if  developed,  such market  will be  sustained.  It is
currently  anticipated that the initial public offering prices will be $5.00 per
share of  Common  Stock  and $.10 per  Redeemable  Warrant.  For the  method  of
determining  the initial  public  offering  price of the  Securities,  see "RISK
FACTORS" and  "UNDERWRITING."  The Company intends to apply for inclusion of the
shares of Common Stock and the Redeemable Warrants on the Nasdaq SmallCap Market
under the symbols "PRDU" and "PRDUW," respectively.

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

   
     THESE ARE SPECULATIVE SECURITIES. THE SECURITIES OFFERED HEREBY INVOLVE
   A HIGH DEGREE OF RISK AND IMMEDIATE SUBSTANTIAL DILUTION. INVESTORS SHOULD
   BE ABLE TO SUSTAIN A COMPLETE LOSS OF THEIR INVESTMENT. SEE "RISK FACTORS"
           AND "DILUTION" ON PAGES 6 THROUGH 17 AND 19, RESPECTIVELY.
    

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


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

<TABLE>
<CAPTION>

                                                             PRICE TO    UNDERWRITING    PROCEEDS TO
                                                              PUBLIC     DISCOUNTS(1)    COMPANY(2)
                                                              ------     ------------    ----------
<S>                                                         <C>          <C>             <C>
Per Share                                                      $5.00         $.50           $4.50
Per Redeemable Warrant                                         $ .10         $.01           $ .09
Total(3)                                                    $5,100,000     $510,000      $4,590,000

</TABLE>

   
(1) Does not reflect additional compensation to be received in the form of (a) a
    3%  non-accountable  expense  allowance  in the  amount  of  $153,000  and a
    consulting fee payable to Schneider Securities,  Inc., as the representative
    (the  "Representative")  of the  underwriters  (the  "Underwriters")  in the
    amount of $3,000 per month for a period of 36 months and (b)  warrants  (the
    "Representative's  Warrants") to purchase up to 100,000 additional shares of
    Common Stock and 100,000 Redeemable  Warrants at 160% of the public offering
    price of the  Securities.  In addition,  the Company has agreed to indemnify
    the Underwriters  against certain civil liabilities,  including  liabilities
    under the Securities  Act of 1933, as amended (the  "Securities  Act").  See
    "UNDERWRITING."
    
(2) Before deducting additional expenses of the Offering payable by the Company,
    estimated  at  $450,000,  including  the  Representative's   non-accountable
    expense allowance and the consulting fee payable to the Representative.
(3) The  Company has  granted  the  Underwriters  an option to purchase up to an
    additional 150,000 shares of Common Stock and/or 150,000 Redeemable Warrants
    on  the  same  terms  and  conditions  set  forth  above,  solely  to  cover
    over-allotments,  if any. If the over-allotment option is exercised in full,
    the total  "Price to Public,"  "Underwriting  Discounts"  and  "Proceeds  to
    Company" will be  $5,865,000,  $586,500 and  $5,278,500,  respectively.  See
    "UNDERWRITING."


    The  Securities  are  being  offered  on a "firm  commitment"  basis  by the
Underwriters, when, as, and if delivered to and accepted by the Underwriters and
subject to prior  sale,  withdrawal  or  cancellation  of the  Offering  without
notice. It is expected that delivery of certificates representing the Securities
will be made at the clearing offices of Schneider Securities,  Inc., on or about
__________, 1997.

                           SCHNEIDER SECURITIES, INC.

           THE DATE OF THIS PROSPECTUS IS                , 1997.













    IN CONNECTION WITH THIS OFFERING,  THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OR
THE REDEEMABLE  WARRANTS AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE  PREVAIL IN
THE OPEN  MARKET.  SUCH  TRANSACTIONS  MAY BE  EFFECTED  ON THE NASDAQ  SMALLCAP
MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

    PRIOR TO THE  OFFERING,  THE COMPANY WAS NOT A REPORTING  COMPANY  UNDER THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (THE "EXCHANGE ACT").  SUBSEQUENT TO
THE OFFERING,  THE COMPANY INTENDS TO FURNISH TO ITS SHAREHOLDERS ANNUAL REPORTS
CONTAINING FINANCIAL STATEMENTS AUDITED BY ITS INDEPENDENT ACCOUNTANTS, AND SUCH
OTHER  PERIODIC  REPORTS AS IT MAY DETERMINE TO FURNISH OR AS MAY BE REQUIRED BY
LAW.

   
    CALIFORNIA  INVESTORS  SHOULD  NOTE  THAT  THE  DEPARTMENT  OF  CORPORATIONS
REQUIRES THAT INVESTORS MUST MEET THE FOLLOWING  SUITABILITY  STANDARDS:  (I) AN
INVESTOR  MUST HAVE A LIQUID  NET WORTH OF NOT LESS THAN  $250,000  (A NET WORTH
EXCLUSIVE OF HOME, HOME  FURNISHINGS  AND AUTOMOBILE)  PLUS $65,000 GROSS ANNUAL
INCOME OR $500,000 LIQUID NET WORTH; OR (II) $1,000,000 NET WORTH (INCLUSIVE) OR
$200,000 GROSS ANNUAL INCOME.

    IN ADDITION, CALIFORNIA INVESTORS SHOULD NOTE THAT THE EXEMPTION PROVIDED BY
SECTION 25104(H) OF THE CALIFORNIA CORPORATION CODE WILL NOT BE AVAILABLE.  THIS
MEANS  THAT  THERE  WILL  BE NO  AFTERMARKET  TRADING  IN  PERARDUA  CORPORATION
SECURITIES IN THE STATE OF CALIFORNIA.  PERARDUA AND THE UNDERWRITER HAVE AGREED
NOT TO APPLY FOR THE EXEMPTION  PROVIDED UNDER SECTION 25101(B) FOR 90 DAYS FROM
THE CLOSING OF THE OFFERING.
    







                               PROSPECTUS SUMMARY

   
    The following  summary is qualified in its entirety by reference to the more
detailed  information,  including  "RISK  FACTORS" and the  Company's  financial
statements and related notes thereto appearing elsewhere in this Prospectus. The
Common Stock and  Redeemable  Warrants  offered  hereby involve a high degree of
risk.  Investors  in the Offering  should be able to sustain a complete  loss of
their  investment.   See  "RISK  FACTORS."  This  Prospectus   contains  certain
forward-looking  statements that involve risks and  uncertainties.  See "SPECIAL
NOTE REGARDING FORWARD-LOOKING STATEMENTS." The Company's actual results and the
timing of certain  events could  differ  materially  from those  discussed in or
projected  by the  forward-looking  statements.  Factors  that  could  cause  or
contribute to such differences include those discussed under "RISK FACTORS."
    

                                   THE COMPANY

   
    The Company is a development  stage  pharmaceutical  company  engaged in the
development  of a single  anti-viral  compound for which the Company has adopted
the trade name  "Thiovir(tm)."  The initial focus of the  Company's  development
activities  will be to  demonstrate  the safety  and  efficacy  of  Thiovir  for
treatment of patients infected with human  immunodeficiency  virus ("HIV"),  the
virus which is the precursor to acquired immunodeficiency syndrome ("AIDS"), and
patients showing active  infection of the  opportunistic  virus  cytomegalovirus
("CMV")  which  causes  blindness  and  other   conditions.   CMV  is  a  common
opportunistic  infection among AIDS patients. The Company believes that Thiovir,
if successfully  developed and approved for sale,  would  constitute a candidate
for  inclusion in  combination  drug therapy for  HIV/AIDS  treatment  and would
provide  several  benefits over existing  treatments for CMV,  particularly  its
potential ability to replace more toxic intravenous  treatment with a less toxic
oral treatment. The only development work on Thiovir to date has been limited to
laboratory and animal studies conducted by the University of Southern California
("USC"),  which has licensed to the Company its  proprietary  rights to Thiovir,
and by other academic  and/or research  organizations  which have no affiliation
with the Company.  Therefore,  Thiovir is in an early stage of development.  See
"BUSINESS -- Targeted  Indications for Thiovir" and "-- Research and Development
Status and Activities."
    

    In the  United  States,  the use and sale of Thiovir is subject to the rules
and regulations of the United States Food and Drug Administration  ("FDA"),  and
obtaining the necessary FDA approval will require substantial  preclinical tests
and clinical trials. The Company expects to commence clinical trials for Thiovir
in 1997. The Company believes that Thiovir may meet the criteria  established by
the FDA for  accelerated  approval.  As a  result,  the  Company  may be able to
commercialize  Thiovir  in a shorter  time  period  than has  historically  been
applicable for a drug that does not meet the criteria for accelerated  approval.
See "BUSINESS -- Government Regulation."

   
    Initially,   the   Company   intends  to   maintain   a  limited   corporate
infrastructure    devoted   almost    exclusively   to   the   development   and
commercialization  of Thiovir.  Accordingly,  the Company  will engage  contract
research organizations ("CROs") to conduct preclinical tests and clinical trials
on Thiovir.  The Company will also contract with other  companies to manufacture
the drug.  The Company  intends to rely upon part-time  consultants  and CROs to
provide  expertise in designing  appropriate tests and trials and in seeking FDA
and other government approvals.  Furthermore,  the Company does not believe that
it will be  necessary  to  develop an  extensive  sales and  marketing  force to
promote  the sale of Thiovir in the United  States,  if and when it may be sold,
since  the  market  for  HIV/AIDS  and CMV  therapies  is  concentrated  among a
relatively  small  number  of  care  providers.   See  "BUSINESS  --  Sales  and
Marketing," "-- Manufacturing" and "-- Personnel."

    In August  1996,  the Company  acquired an  exclusive  worldwide  license to
proprietary  rights  to  Thiovir  held by USC from a limited  partnership  which
funded the research and  development  of Thiovir.  The Company has  generated no
revenues  from the  sale of  products  and,  as of  February  28,  1997,  had an
accumulated  deficit of  $2,227,784.  There can be no assurance that the Company
will ever achieve profitable operations. See "BUSINESS -- Relationship With USC"
and "CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS."
    

    On January 9, 1997, the Company reincorporated in the State of Delaware. The
term  "Company,"  when  used in this  Prospectus,  refers  to both the  Delaware
corporation  and  its  predecessor  Missouri  corporation,  unless  the  context
requires  otherwise.  The  Company's  offices  are  located  at  10940  Wilshire
Boulevard, Suite 1600, Los Angeles, California, and its telephone
number is (310) 443-4240.


                                       3



                                  THE OFFERING

Securities Offered by the
  Company.................  1,000,000   shares  of   Common   Stock  and
                            1,000,000    Redeemable    Warrants.     See
                            "DESCRIPTION OF SECURITIES."

Redeemable Warrants.......  Each Redeemable  Warrant entitles the holder
                            to purchase  one share of Common  Stock at a
                            price of $6.50  per share  beginning  , 1998
                            and  ending , 2002,  unless  the  Redeemable
                            Warrants  are  redeemed as provided  herein.
                            The  Redeemable  Warrants are  redeemable by
                            the  Company at a  redemption  price of $.20
                            per   Redeemable   Warrant   at   any   time
                            commencing  thirteen months from the date of
                            this  Prospectus  on 30 days' prior  written
                            notice,  provided  that the average  closing
                            bid  price of the  Common  Stock  equals  or
                            exceeds  $9.00 per share for 20  consecutive
                            trading days ending  within 10 days prior to
                            the notice of redemption.  See  "DESCRIPTION
                            OF SECURITIES."

   
Shares of Common Stock
  Outstanding
  before Offering.........  2,643,440 shares

Shares of Common Stock to
  be Outstanding
  after Offering..........  3,643,440 shares
    

Use of Proceeds...........  The net  proceeds of this  Offering  will be
                            used for further  research  and  development
                            and working capital. See "USE OF PROCEEDS."

Risk Factors..............  Investment in the Securities involves a high
                            degree of risk and immediate  dilution.  See
                            "RISK FACTORS" and "DILUTION."

   
Proposed Nasdaq SmallCap
  Market Symbols(1).......  Common Stock -- "PRDU"
                            Redeemable Warrants -- "PRDUW"

- ----------
(1) No assurance can be given that an active trading market for the
    Securities will develop or be maintained. See "RISK FACTORS -- No
    Prior Market for Common Stock and the Redeemable Warrants."

    Except  as  otherwise  indicated,  all  share  and  per  share  data in this
Prospectus  (i) assume no  exercise  of the  Redeemable  Warrants,  (ii) give no
effect to the  300,000  shares of Common  Stock  issuable  upon  exercise of the
Underwriters'  over-allotment  option,  including 150,000 shares of Common Stock
underlying the Redeemable Warrants subject to such option;  (iii) give no effect
to 100,000 shares of Common Stock issuable upon exercise of the Representative's
Warrants;  (iv) give no effect to the 100,000  shares of Common  Stock  issuable
upon the exercise of the Redeemable  Warrants  underlying  the  Representative's
Warrants;  (v) assume no  exercise  of stock  options to  purchase up to 500,000
shares of Common  Stock  which may be issued  pursuant  to the  Company's  Stock
Incentive  Plan, of which,  as of the date of this  Prospectus,  the Company has
granted  options to purchase  10,000 shares of Common Stock at an exercise price
of $7.50 per share and  committed to grant to three  outside  directors  and two
officers  options to purchase an aggregate of 230,000  shares of Common Stock at
an exercise price to be determined,  but not less than $5.00 per share; and (vi)
assume no exercise of the Company's  outstanding  warrants to purchase shares of
Common Stock, of which 700,000  warrants have been issued as of the date of this
Prospectus  at an  exercise  price of $10.00 per share which may be paid in cash
or, in the event the fair market value of the Common  Stock  exceeds the warrant
exercise  price, by a reduction in the number of shares of Common Stock issuable
upon  excercise of any warrant  determined  in accordance  with a formula.  (the
"Outstanding  Warrants").  See  "CAPITALIZATION"  and  "MANAGEMENT  -- Executive
Compensation and Other Information -- Stock Incentive Plan."
    

                                   4


                      SUMMARY FINANCIAL INFORMATION

    The following  sets forth certain  historical  financial  information of the
Company:

STATEMENT OF ACTIVITIES DATA:


<TABLE>
<CAPTION>
   
                                                                          PERIOD FROM JULY 5, 1996,      THREE MONTHS
                                                                            DATE OF INCEPTION, TO           ENDED
                                                                              NOVEMBER 30, 1996       FEBRUARY 28, 1997
                                                                              -----------------       -----------------
<S>                                                                           <C>                     <C>
Revenue:
   Interest income                                                               $     1,858             $     2,475
                                                                                 -----------             -----------
Costs and Expense:
   Research and development                                                        2,058,980                  73,249
   General and administrative                                                         33,568                  66,320
                                                                                   ---------                 -------
                                                                                   2,092,548                 139,569
                                                                                   ---------                 -------
Net loss                                                                          (2,090,690)               (137,094)
                                                                                  ==========                ======== 
Net loss per common share(1)                                                     $      (.81)            $      (.05)
                                                                                 ===========             =========== 
Shares used in computing net loss per common share(1)                              2,593,440               2,593,996
                                                                                 ===========             =========== 

BALANCE SHEET DATA:


                                                                                FEBRUARY 28, 1997
                                                                                -----------------
                                                                             ACTUAL     AS ADJUSTED(2)
                                                                             ------     --------------
Cash and cash equivalents                                                 $   213,029     $ 4,353,029
Working capital                                                               431,362       4,571,362
Total assets                                                                  502,625       4,642,625
Deficit accumulated during the development stage                           (2,227,784)     (2,227,784)
Total stockholders' equity                                                    443,393       4,583,393

</TABLE>
- ------------
(1) See  notes  1  and  4 of  Notes  to  Financial  Statements  for  information
    concerning the  computation of net loss per share of Common Stock and shares
    of Common Stock used in computing net loss per common share.

(2) As  adjusted  to  reflect  the sale of the Common  Stock and the  Redeemable
    Warrants  offered  hereby and the  application of the estimated net proceeds
    therefrom. See "USE OF PROCEEDS."
    

                                       5





                                  RISK FACTORS

    The  Securities  offered  pursuant to this  Prospectus are  speculative  and
involve a high degree of risk,  and an  investment in the  Securities  should be
considered  only by investors who are capable of affording an entire loss of the
amount invested. Prospective investors should carefully consider, along with the
other information contained in this Prospectus, the following considerations and
risks in evaluating an investment in the Company.

DEVELOPMENT STAGE COMPANY

    The  Company  commenced  development  stage  activities  in  July  1996  and
accordingly has only a limited operating history upon which an evaluation of the
Company's  business and  prospects  can be based.  The Company has  generated no
revenue to date, except for interest income, and does not expect to generate any
substantial  revenues  in the near  future.  The  Company's  ability to generate
revenues and profits will depend on its ability to successfully develop clinical
applications and obtain regulatory approvals for the anti-viral drug Thiovir and
to protect its proprietary rights in Thiovir.  The Company must also develop the
capacity or  arrangements  with third  parties to  manufacture,  distribute  and
market Thiovir. There can be no assurance that the Company will be successful in
doing so. See "BUSINESS -- Overview."

UNCERTAINTY OF PRODUCT DEVELOPMENT

   
    Thiovir  is  in  an  early  development  stage  and  requires   significant,
time-consuming  and  costly  development,   testing  and  regulatory  clearance.
Although the Company anticipates that the development and  commercialization  of
Thiovir,  if  successful,  will occur  more  rapidly  than is typical  for a new
pharmaceutical  product, this process typically takes several years at a minimum
and can require  substantially more time. The successful  development of any new
drug is highly  uncertain and subject to a number of  significant  risks.  These
risks include,  among others,  the possibility  that Thiovir will be found to be
ineffective  or  unacceptably  toxic,  to have  unacceptable  side  effects,  or
otherwise fail to receive necessary regulatory clearances, that Thiovir will not
achieve broad market  acceptance,  that third parties will market  equivalent or
superior products,  or that third parties will hold proprietary rights that will
preclude  the  Company  from  marketing  Thiovir.  There can be,  therefore,  no
assurance  that  the  Company's  development  activities  will  demonstrate  the
efficacy and safety of Thiovir as a therapeutic  drug, or, even if demonstrated,
that there will be sufficient  advantages to the use of Thiovir over other drugs
or  treatments so as to render  Thiovir  commercially  viable.  See "BUSINESS --
Targeted Indications for Thiovir" and " -- Government Regulation."


UNCERTAINTY OF MARKET DEMAND FOR THIOVIR

    There is a considerable  degree of  uncertainty  as to the potential  market
demand for Thiovir, particularly as a CMV drug.

    The  Company is not aware of  published  data which  indicate  the extent to
which new cases of active  CMV  infection  have been  reduced as a result of the
recent  success of  combination  drug therapy  among HIV  patients.  The Company
believes,  however,  and  anecdotal  reports  confirm,  that to the extent  that
combination  drug therapy,  or any other  therapy,  is effective in treating HIV
patients, the number of new patients with active CMV infection has been and will
be  proportionately  reduced.  Consequently,  the  demand  for CMV  drugs may be
significantly  diminished  at the time,  if ever,  the Company is able to market
Thiovir. See "BUSINESS -- Potential Market for Thiovir."

    The  ability of the HIV and CMV viruses to develop  resistance  to drugs has
reduced or eliminated the  effectiveness of a number of existing drugs.  Even if
Thiovir should initially prove effective,  its  effectiveness  and acceptance in
the marketplace  may be reduced by the  development of resistant  strains of the
HIV and CMV viruses.

COMPANY'S ABILITY TO CONTINUE AS A GOING CONCERN

    The  report of the  Company's  Independent  Auditors  contains  an  emphasis
paragraph as to matters that raise substantial doubt about the Company's ability
to  continue  as a going  concern,  and  management's  inability  to provide any
assurance  that the Company  will obtain  sufficient  financing to continue as a
going


                                       6



concern.  See "MANAGEMENT'S  DISCUSSION AND ANALYSIS OF FINANCIAL  CONDITION AND
RESULTS OF OPERATIONS,"  the Company's  Financial  Statements and Notes, and the
Independent Auditor's Report included elsewhere herein.
    

RELIANCE ON A SINGLE TECHNOLOGY; LIMITED SCOPE OF OPERATIONS

    The  Company  currently  intends to focus its  business  exclusively  on the
development and commercialization of the experimental drug Thiovir. In the event
the  Company  is not  successful  in  developing  and  commercializing  Thiovir,
investors are likely to realize a loss of all amounts invested in the Company.

ACCUMULATED DEFICIT; UNCERTAINTY OF FUTURE PROFITABILITY
   
    The Company has  incurred  losses  since its  inception.  As of February 28,
1997, the Company's  accumulated  deficit was  $2,227,784.  Losses have resulted
principally  from costs incurred in the  acquisition  and development of Thiovir
and general and  administrative  costs.  These costs have exceeded the Company's
revenues,  which to date have been generated  solely from interest  income.  The
Company  has not  generated  any revenue to date from the sale of drugs and does
not  expect to do so until  Thiovir  has been  approved  for sale.  The  Company
expects to incur significant  additional operating losses which will increase as
the Company's drug development  efforts expand. The Company's ability to achieve
profitability  will depend  upon its  ability to develop  and obtain  regulatory
approval  for Thiovir and to develop the capacity  (or  establish  relationships
with third  parties) to  manufacture,  market and sell Thiovir.  There can be no
assurance  that the Company will ever generate  significant  revenues or achieve
profitable  operations.  See "BUSINESS -- Government  Regulation," "-- Sales and
Marketing," and "-- Manufacturing."
    

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING

    The  Company's  drug  development   program  requires   substantial  capital
expenditures, including expenditures for preclinical testing and clinical trials
of  Thiovir.  The  Company's  future  capital  requirements  will depend on many
factors,  including  the scope and results of  preclinical  testing and clinical
trials, the cost, timing and outcome of regulatory  reviews,  administrative and
legal  expenses  (including  potential  expenses of defending  and enforcing the
Company's  proprietary patent rights to Thiovir),  the establishment of capacity
for sales and marketing functions, the establishment of relationships with third
parties for manufacturing  and sales and marketing  functions and other factors.
The Company expects that its capital requirements will increase significantly in
the future.  See "BUSINESS -- Government  Regulation,"  "-- Sales and Marketing"
and "-- Manufacturing."

    The  Company  has  incurred   negative  cash  flow  from  development  stage
activities since inception and does not expect to generate positive cash flow to
fund its  operations  for at least the next  several  years.  As a  result,  the
Company  believes that  substantial  additional  equity or debt financing may be
required to fund its operations. There can be no assurance that the Company will
be able to consummate  any such  financing at all or on favorable  terms or that
such financings will be adequate to meet the Company's capital requirements. Any
additional  equity  financing  could  result  in  substantial  dilution  to  the
Company's  stockholders,   and  debt  financing,   if  available,   may  involve
restrictive  covenants which preclude the Company from making  distributions  to
stockholders and taking other actions  beneficial to  stockholders.  If adequate
funds are not  available,  the  Company  may be  required to delay or reduce the
scope of its drug  development  program or attempt to  continue  development  by
entering  into  arrangements  with  collaborative  partners  or others  that may
require the  Company to  relinquish  some or all of its rights to  Thiovir.  The
Company's  inability  to fund its  capital  requirements  would  have a material
adverse effect on the Company. See "USE OF PROCEEDS" and "DILUTION."

EXTENSIVE GOVERNMENT REGULATION; NO ASSURANCE OF REGULATORY APPROVAL

    Human  pharmaceutical  products are subject to rigorous  preclinical testing
and  clinical  trials  and other  approval  procedures  mandated  by the FDA and
foreign  regulatory  authorities.  Various  federal  and  foreign  statutes  and
regulations  also  govern or  influence  the  manufacturing,  safety,  labeling,
storage,


                                       7



record  keeping  and  marketing  of  pharmaceutical  products.  The  process  of
obtaining these approvals and the subsequent  compliance with appropriate United
States and foreign statutes and regulations are  time-consuming  and require the
expenditure  of  substantial  resources.  In addition,  these  requirements  and
processes vary widely from country to country. Among the uncertainties and risks
of the FDA approval process are the following:  the possibility that studies and
clinical trials shall fail to prove the safety and efficacy of the drug, or that
any  demonstrated  efficacy  will be so  limited as to  significantly  reduce or
altogether  eliminate the  acceptability  of the drug in the market  place;  the
possibility  that the costs of  development,  which can far  exceed  the best of
estimates,  may render  commercialization  of the drug marginally  profitable or
altogether  unprofitable;  and the possibility  that the amount of time required
for FDA approval of a drug may extend for years beyond that which is  originally
estimated.  In addition,  the FDA or similar foreign regulatory  authorities may
require  additional  clinical trials,  which could result in increased costs and
significant  development  delays.  Delays or rejections  may also be encountered
based upon changes in FDA policy and the establishment of additional regulations
during the period of  product  development  and FDA  review.  Similar  delays or
rejections may be encountered  in other  countries.  Thiovir may not qualify for
accelerated  development  and/or  approval  under FDA  regulations  and, even if
Thiovir does so qualify,  it may not be approved for marketing sooner than would
be historically expected or at all.

   
    There can be no assurance that even after substantial time and expenditures,
Thiovir will receive FDA approval on a timely basis or at all. If the Company is
unable to demonstrate the safety and efficacy of Thiovir to the  satisfaction of
the FDA, the Company will be unable to commercialize Thiovir. Even if regulatory
approval of Thiovir is  obtained,  the approval  may entail  limitations  on the
indicated  uses for which  Thiovir  may be  marketed.  A marketed  product,  its
manufacturer and the  manufacturer's  facilities are subject to continual review
and  periodic  inspections,  and  subsequent  discovery  of  previously  unknown
problems with a product,  manufacturer or facility may result in restrictions on
such  product or  manufacturer,  including  withdrawal  of the product  from the
market. The failure to comply with applicable regulatory requirements can, among
other things, result in fines,  suspension of regulatory  approvals,  refusal to
approve pending applications,  refusal to permit exports from the United States,
product  recalls,  seizure of  products,  operating  restrictions  and  criminal
prosecutions.

    The effect of government regulation may be to delay the marketing of Thiovir
for a  considerable  period  of  time,  to  impose  costly  requirements  on the
Company's activities or to provide a competitive advantage to the companies that
compete  with the  Company.  Adverse  clinical  results  by others  could have a
negative  impact on the  regulatory  process  and  timing  with  respect  to the
development  and  approval  of Thiovir.  The Company is also  subject to various
federal,  state  and  local  laws  and  regulations  relating  to  safe  working
conditions,  laboratory and  manufacturing  practices,  the  experimental use of
animals  and  the  use  and  disposal  of  hazardous  or  potentially  hazardous
substances,  including radioactive compounds and infectious disease agents, used
in connection with its development work. The extent and character of potentially
adverse  governmental  regulation  that may arise  from  future  legislation  or
administrative   action  cannot  be  predicted.   See  "BUSINESS  --  Government
Regulation."
    

UNCERTAINTIES RELATED TO CLINICAL TRIALS

    Before obtaining  required  regulatory  approvals for the commercial sale of
Thiovir,  the Company must demonstrate  through preclinical testing and clinical
trials that Thiovir is safe and effective for use in each target indication. The
results from preclinical testing and early clinical trials may not be predictive
of results  that will be obtained in pivotal  clinical  trials.  There can be no
assurance that the Company's clinical trials will demonstrate  sufficient safety
and  effectiveness to obtain required  regulatory  approvals or will result in a
marketable  product. A number of companies in the  pharmaceutical  industry have
suffered  significant setbacks in advanced clinical trials, even after promising
results in earlier  trials.  Similar  setbacks in the Company's  clinical trials
could interrupt,  delay or halt clinical trials and could ultimately prevent its
approval by the FDA or foreign  regulatory  authorities for any and all targeted
indications.  The Company or the FDA may suspend or terminate clinical trials at
anytime  if it is  believed  that the trial  participants  are being  exposed to
unacceptable  health risks.  There can be no assurance that clinical trials will
demonstrate that Thiovir is safe and effective.


                                       8




    There  can  be  no  assurance  that  if  clinical  trials  are  successfully
completed,  the Company will be able to submit a New Drug Application ("NDA") in
a timely  manner or that any such  application  will be approved by the FDA. Any
failure of the Company to complete  successfully  its clinical trials and obtain
approvals of corresponding NDAs would preclude the Company from  commercializing
Thiovir in the United States. See "BUSINESS -- Government Regulation."

   
INTENSE COMPETITION

    The Company is engaged in a segment of the  pharmaceutical  industry that is
highly competitive and rapidly changing. If successfully developed and approved,
Thiovir  will  compete with several  existing  HIV/AIDS  and CMV  therapies.  In
addition,  other companies are pursuing the development of pharmaceuticals  that
target  HIV/AIDS and/or CMV. The Company  anticipates  that it will face intense
and  increasing  competition  in the future as new products enter the market and
advanced technologies become available.  There can be no assurance that existing
products or new products developed by the Company's competitors will not be more
effective,  or more  effectively  marketed and sold,  than Thiovir.  Competitive
products may render Thiovir  obsolete or  noncompetitive  prior to the Company's
recovery of development or commercialization expenses. The Company's competitors
have  significantly  greater  financial,  technical and human resources than the
Company and may be better equipped to develop,  manufacture and market products.
In addition,  many of these  companies have extensive  experience in preclinical
testing and clinical trials,  obtaining FDA and other  regulatory  approvals and
manufacturing and marketing  pharmaceutical  products. Many of these competitors
also have products that have been approved or are in late-stage  development and
operate large, well-funded research and development programs.  Smaller companies
may also prove to be significant competitors, particularly through collaborative
arrangements with large pharmaceutical and biotechnology companies. Furthermore,
academic institutions, government agencies and other public and private research
organizations are becoming  increasingly  aware of the commercial value of their
inventions and are actively  seeking to  commercialize  the technology they have
developed. Accordingly, the Company's competitors may succeed in commercializing
products  more  rapidly or  effectively  than the  Company,  which  would have a
material  adverse effect on the Company.  See "BUSINESS -- Potential  Market for
Thiovir."
    

    The  ability of the HIV and CMV viruses to develop  resistance  to drugs has
reduced or eliminated the  effectiveness of a number of existing drugs.  Even if
Thiovir should initially prove effective,  its  effectiveness  and acceptance in
the marketplace  may be reduced by the  development of resistant  strains of the
HIV and CMV viruses.

UNCERTAINTY OF PATENTS; DEPENDENCE ON PATENTS, LICENSES AND PROPRIETARY RIGHTS

   
    The  Company's  success  will  depend in large  part on the  ability  of the
Company and its licensors to obtain patent  protection  with respect to Thiovir,
defend  patents  once  obtained,  maintain  trade  secrets and  operate  without
infringing  upon the  patents  and  proprietary  rights  of  others  and  obtain
appropriate  licenses to patents or proprietary  rights held by third parties if
infringement  would  otherwise  occur,  both in the United States and in foreign
countries.  The Company has no patents in its own name or patent applications of
its own  pending,  but has  obtained a license to patents and other  proprietary
rights from USC with  respect to Thiovir.  See  "BUSINESS --  Relationship  With
USC."

    The patent  positions of  pharmaceutical  companies,  including those of the
Company, are uncertain and involve complex legal and factual questions for which
important legal  principles are  unresolved.  There can be no assurance that the
Company or its licensor have or will develop or obtain the rights to products or
processes that are  patentable,  that patents will issue from any of the pending
applications or that claims allowed will be sufficient to protect the technology
licensed to the Company. In addition, no assurance can be given that any patents
issued  to or  licensed  by the  Company  will not be  challenged,  invalidated,
infringed or  circumvented,  or that the rights granted  thereunder will provide
competitive advantages to the Company.

    Initial  research  indicates  that  Thiovir may  partially  metabolize  into
another drug, the use of which in the treatment of HIV and related infections is
subject to patents held by a third party,  all of which are  scheduled to expire
in or before 2000. The Company  believes that the use of Thiovir in treatment of
HIV and CMV likely would not infringe on any known third party patent rights, or
that if  infringement  were to occur,  it would not be likely to have a material
adverse effect on the Company. See "BUSINESS -- Patents."
    


                                       9




    There can be no assurance that the Company is aware of all patents or patent
applications  that may materially  affect the Company's  ability to make, use or
sell Thiovir.  United States patent  applications are confidential while pending
in the United  States  Patent  and  Trademark  Office  (the  "PTO"),  and patent
applications  filed in foreign countries are often first published six months or
more after filing. Any conflicts  resulting from third party patent applications
and patents  could  significantly  reduce the  coverage of the patents or patent
applications licensed to the Company and limit the ability of the Company or its
licensors to obtain meaningful patent protection. If patents are issued to other
companies that contain  competitive or  conflicting  claims,  the Company may be
required to obtain licenses to these patents or to develop or obtain alternative
technology.  There can be no  assurance  that the Company will be able to obtain
any such  license  on  acceptable  terms  or at all.  If such  licenses  are not
obtained,  the  Company  could be  delayed in or  prevented  from  pursuing  the
development or commercialization of Thiovir.

   
    Litigation which could result in substantial cost to the Company may also be
necessary  to  enforce  any  patents  to which the  Company  has  rights,  or to
determine the scope, validity and unenforceability of other parties' proprietary
rights which may affect the Company's  rights to Thiovir.  United States patents
carry a presumption  of validity and generally can be  invalidated  only through
clear  and  convincing  evidence.  The  Company's  licensors  may  also  have to
participate  in  interference  proceedings  declared by the PTO to determine the
priority of an invention, which could result in substantial cost to the Company.
There can be no assurance  that the  Company's  licensed  patents  would be held
valid by a court or  administrative  body or that an alleged  infringer would be
found to be infringing.  The mere uncertainty resulting from the institution and
continuation of any  technology-related  litigation or  interference  proceeding
could have a material  adverse effect on the Company  pending  resolution of the
disputed matters.
    

    The  Company  may also rely on  unpatented  trade  secrets  and  know-how to
maintain  its  competitive  position,  which it seeks to  protect,  in part,  by
confidentiality agreements with employees,  consultants and others. There can be
no assurance that these agreements will not be breached or terminated,  that the
Company will have adequate  remedies for any breach, or that the Company's trade
secrets  will not  otherwise  become  known or be  independently  discovered  by
competitors. See "BUSINESS -- Patents."

DEPENDENCE ON AND NEED TO HIRE PERSONNEL

   
    The Company is  dependent on its senior  management  and  scientific  staff,
which currently  consists of Dr. Francis E. O'Donnell,  Jr.,  Chairman and Chief
Executive  Officer,  Nicholas Jon Virca,  President and Chief Operating Officer,
Mary Anthony Gray,  Executive Vice  President,  and Dr. Charles E. McKenna.  Dr.
McKenna,  who is the inventor of the patents licensed to the Company of the core
technology  for Thiovir and who has  directed  the research on Thiovir at USC to
date, is a consultant  to the Company and only devotes a limited  portion of his
time to the Company's  business.  The services of Dr. O'Donnell,  Mr. Virca, Ms.
Gray,  and Dr. McKenna are important to the Company and the loss of any of their
services may  adversely  affect the Company.  Dr.  O'Donnell is serving as Chief
Executive Officer of the Company on an interim basis.
    

    To develop and  commercialize  Thiovir,  the Company  must hire and retain a
number of additional highly qualified and experienced  management and scientific
personnel, consultants and advisors. The Company's ability to attract and retain
qualified  personnel  is  critical to the  Company's  success.  Competition  for
qualified  individuals  is  intense,  and the  Company  faces  competition  from
numerous  pharmaceutical  and  biotechnology  companies,  universities and other
research  institutions.  There can be no assurance that the Company will be able
to attract and retain such  individuals  on acceptable  terms or at all, and the
failure  to do so would  have a  material  adverse  effect on the  Company.  See
"MANAGEMENT -- Executive Officers and Directors."

BROAD DISCRETION IN USE OF PROCEEDS

    The net  proceeds of the  Offering  will be added to the  Company's  working
capital and will be available  for general  corporate  purposes,  including  the
Company's  drug  development  program.  As of the date of this  Prospectus,  the
Company cannot  specify with certainty the particular  uses for the net proceeds
to be added to its  working  capital.  Accordingly,  management  will have broad
discretion in the application of the net proceeds. See "USE OF PROCEEDS."


                                       10





RISKS RELATED TO LICENSE AGREEMENT

   
    The agreement pursuant to which the Company has licensed the core technology
for Thiovir  permits the  Company's  licensor,  USC, to terminate  the agreement
under  certain  circumstances,  such as the  failure  by the  Company to use its
reasonable best efforts to commercialize  Thiovir or the occurrence of any other
uncured material breach by the Company.  The termination of this agreement would
have a material adverse effect on the Company.  The license  agreement  provides
that the licensor is primarily  responsible for obtaining patent  protection for
the technology licensed to the Company, and the Company is required to reimburse
it for the costs it incurs in performing these activities.  The Company believes
that these costs will be  substantial.  The license  agreement also requires the
Company to pay minimum  royalties which start at $12,500 in 1998 and increase to
$125,000  in 2001 and each year  thereafter.  Any  inability  or  failure of the
Company  to pay these  costs  could  result in the  termination  of the  license
agreement.  In  addition,  the license  agreement  reserves for the licensor the
right to approve sublicenses granted under the license agreement.  Although such
approval  may not be  unreasonably  withheld,  the need for  such  approval  may
inhibit the Company's development of strategic  relationships  necessary for the
commercialization  of Thiovir.  See "BUSINESS -- Research and Development Status
and Activities" and " -- Relationship with USC."
    

LACK OF MANUFACTURING CAPABILITIES

    The Company does not have any manufacturing  capacity and currently plans to
seek  to  establish   relationships  with  third  party  manufacturers  for  the
manufacture of clinical trial material and the commercial production of Thiovir,
if any.  There can be no  assurance  that the Company  will be able to establish
relationships with third party manufacturers on commercially acceptable terms or
that  third  party  manufacturers  will  be  able to  manufacture  Thiovir  on a
cost-effective basis in commercial quantities under good manufacturing practices
("GMPs")  mandated by the FDA. The Company's  dependence  upon third parties for
the  manufacture  of its  products may  adversely  affect the  Company's  profit
margins  and its ability to develop  and  commercialize  Thiovir on a timely and
competitive  basis.  Further,  there can be no assurance that  manufacturing  or
quality  control  problems will not arise in connection  with the manufacture of
the  Company's  products  or  that  third  party  manufacturers  will be able to
maintain  the  necessary   governmental   licenses  and  approvals  to  continue
manufacturing  the Company's  products.  Any failure to establish  relationships
with third parties for its manufacturing requirements on commercially acceptable
terms would have a material  adverse  effect on the  Company.  See  "BUSINESS --
Manufacturing."

LACK OF SALES AND MARKETING CAPABILITIES

    The Company currently has no marketing or sales personnel.  The Company will
have  to  develop  a  sales  force  or  rely  on  marketing  partners  or  other
arrangements  with third  parties for the  marketing,  distribution  and sale of
Thiovir.  There can be no  assurance  that the Company will be able to establish
marketing,  distribution or sales  capabilities or make  arrangements with third
parties to perform those  activities on terms  satisfactory  to the Company,  or
that  any   internal   capabilities   or  third  party   arrangements   will  be
cost-effective.

    In addition, any third parties with which the Company establishes marketing,
distribution or sales  arrangements may have significant  control over important
aspects of the  commercialization of Thiovir,  including market  identification,
marketing  methods,   pricing,   composition  of  sales  force  and  promotional
activities.  There can be no assurance  that the Company will be able to control
the  amount  and  timing of  resources  that any third  party may  devote to the
Company's  products  or  prevent  any  third  party  from  pursuing  alternative
technologies  or products that could result in the  development of products that
compete with Thiovir and the withdrawal of support for Thiovir. See "BUSINESS --
Sales and Marketing."

DEPENDENCE ON THIRD PARTIES FOR DEVELOPMENT AND MANUFACTURING

   
    The Company intends to engage consultants and independent  contract research
organizations  ("CROs") to design and conduct clinical trials in connection with
the  development  of  Thiovir.  The  Company  will also  engage a third party to
manufacture  Thiovir.  As a result,  these  important  aspects of the  Company's
business will be outside the direct control of the Company.  In addition,  there
can  be no  assurance  that  such  third  parties  will  perform  all  of  their
obligations  under  arrangements  with the Company.  See "BUSINESS -- Government
Regulation,"  "--  Research  and  Development  Status and  Activities,"  and "--
Manufacturing."
    


                                       11





NO ASSURANCE OF MARKET ACCEPTANCE

   
    The Company's success will depend in substantial part on the extent to which
Thiovir achieves market acceptance.  The degree of market acceptance will depend
upon a number  of  factors,  including  the  receipt  and  scope  of  regulatory
approvals,  the  establishment and demonstration in the medical community of the
safety and  efficacy  of Thiovir  and its  potential  advantages  over  existing
treatment  methods,  and  reimbursement  policies of government  and third party
payors.  There can no be  assurance  that  physicians,  patients,  payors or the
medical community in general will accept or utilize Thiovir.
    

UNCERTAINTY OF HEALTH CARE REFORM MEASURES AND THIRD PARTY REIMBURSEMENT

    The  business  and  financial  condition of  pharmaceutical  companies  will
continue to be affected by the efforts of governments  and third party payors to
contain  or  reduce  the cost of  health  care.  A  number  of  legislative  and
regulatory proposals aimed at changing the health care system have been proposed
in recent years.  In addition,  an emphasis on managed care in the United States
has  increased  and will  continue to increase  the  pressure on  pharmaceutical
pricing.  While the Company  cannot  predict  whether  legislative or regulatory
proposals will be adopted or the effect those  proposals or managed care efforts
may have on its business,  the announcement and/or adoption of such proposals or
efforts  could  have a material  adverse  effect on the  Company.  In the United
States and elsewhere,  sales of  prescription  pharmaceuticals  are dependent in
part on the  availability  of  reimbursement  to the  consumer  from third party
payors,   such  as  government   and  private   insurance   plans  that  mandate
predetermined  discounts from list prices.  Third party payors are  increasingly
challenging the prices charged for medical products and services. If the Company
succeeds in bringing  Thiovir to the market,  there can be no assurance  that it
will be considered cost effective or that  reimbursement to the consumer will be
available or will be  sufficient  to allow the Company to sell its products on a
competitive  basis. See "BUSINESS -- Health Care Reform Measures and Third Party
Reimbursement."

ABSENCE OF PRODUCT LIABILITY INSURANCE; INSURANCE RISKS

    The Company's  business will expose it to potential  product liability risks
that are inherent in the testing,  manufacturing and marketing of pharmaceutical
products.  There can be no assurance that product  liability  claims will not be
asserted  against the Company.  The Company does not currently  have any product
liability  insurance.  The Company intends to obtain limited  product  liability
insurance  for its clinical  trials when they begin in the United  States and to
expand  its  insurance  coverage  if  and  when  the  Company  begins  marketing
commercial products. However, there can no be assurance that the Company will be
able to obtain product liability  insurance on commercially  acceptable terms or
that the Company will be able to maintain such insurance at a reasonable cost or
in  sufficient  amounts to protect  the  Company  against  potential  losses.  A
successful  product  liability  claim or series of claims  brought  against  the
Company could have a material adverse effect on the Company.

HAZARDOUS MATERIALS

    In the event the Company  should  establish its own  laboratory  facility to
further its drug development  program,  such activities will necessarily involve
the use of hazardous materials, chemicals and viruses. Although the Company will
develop  procedures  for the handling and disposing of such  materials to comply
with the  standards  prescribed  by state and federal  regulations,  the risk of
accidental  contamination  or injury from these  materials  cannot be completely
eliminated.  In the event of such an accident,  the Company could be held liable
for any damages or fines that  result and any such  liability  could  exceed the
resources of the Company.

CONCENTRATION OF STOCK OWNERSHIP; CONTROL OF MANAGEMENT AND EXISTING 
STOCKHOLDERS

   
    Upon  completion  of  the  Offering,  the  Company's  directors,   executive
officers,  other key personnel and their respective affiliates will beneficially
own approximately 21.3% of the outstanding Common Stock  (approximately 20.4% if
the  Underwriters'  over-allotment  option is exercised  in 
    


                                       12





full).  As a result,  these  stockholders  will be able to exercise  significant
influence  over  all  matters  requiring  stockholder  approval,  including  the
election of directors and approval of significant corporate  transactions.  Such
concentration  of ownership may also have the effect of delaying or preventing a
change in control of the Company that may be favored by other stockholders.  See
"PRINCIPAL  STOCKHOLDERS"  and  "DESCRIPTION  OF  SECURITIES -- Delaware Law and
Certain Certificate of Incorporation and Bylaw Provisions."

   
RELATED PARTY TRANSACTIONS

    The Company has entered  into  certain  transactions  with  parties who were
stockholders  of the Company at the time of the  transactions.  A summary of the
terms and  conditions  of these  transactions  may be found  under  the  heading
"CERTAIN  RELATIONSHIPS AND RELATED  TRANSACTIONS."  These transactions  involve
inherent  conflicts between the interest of the Company and the interests of the
other parties to the transactions.
    

SUBSTANTIAL SHARES OF COMMON STOCK RESERVED FOR THE EXERCISE OF OPTIONS AND 
WARRANTS; OBLIGATIONS PURSUANT TO REGISTRATION RIGHTS

    The Company has reserved  500,000  shares of Common Stock for issuance  upon
the exercise of options  granted or available for grant to employees,  officers,
directors,  advisors and  consultants  pursuant to the Company's Stock Incentive
Plan (the  "Incentive  Plan"),  as well as an aggregate  of 1,900,000  shares of
Common Stock for issuance upon  exercise of the (i)  Redeemable  Warrants,  (ii)
Representative's  Warrants and (iii)  Outstanding  Warrants.  These  options and
warrants may adversely  affect the Company's  ability to obtain financing in the
future.  The holders of such  options and  warrants  can be expected to exercise
them at a time when the Company  would  otherwise  be able to obtain  additional
equity capital on terms more favorable to the Company.  See  "UNDERWRITING"  and
"CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS."

   
    The Company has agreed that, under certain  circumstances,  it will register
under  federal  and  state   securities  laws  the  securities   underlying  the
Representative's   Warrants.  In  addition,   certain  shares  of  Common  Stock
previously  issued by the Company are subject to registration  rights granted by
the  Company  in  connection  with the  private  placement  of such  securities.
Exercise of these registration  rights could involve  substantial expense to the
Company at a time when it could not afford such  expenditures  and may adversely
affect the terms upon which the Company  may obtain  additional  financing.  See
"DESCRIPTION OF SECURITIES -- Common Stock."
    

POTENTIAL ADVERSE MARKET IMPACT OF SHARES ELIGIBLE FOR FUTURE SALES;
REGISTRATION RIGHTS

   
    Sales of a substantial number of shares of Common Stock in the public market
following  the Offering  could  adversely  affect the market price of the Common
Stock. Holders of approximately  2,343,440 shares of Common Stock (including the
shares issuable upon the exercise of the  Outstanding  Warrants) are entitled to
include,  subject to certain  limitations,  such shares in certain  registration
statements  which the Company may use to  register  additional  shares of Common
Stock.  In addition,  2,643,440  shares will be eligible for resale,  subject to
applicable  holding  periods,  in the public  market  under Rule 144 or Rule 701
under the Securities Act,  beginning 90 days after the date of this  Prospectus.
1,950,000 shares held by the directors,  officers and certain other stockholders
of the Company are subject to agreements which restrict their sale for 12 months
after the date of this  Prospectus  without  the prior  written  consent  of the
Representative.  See  "UNDERWRITING." The Company intends to file a registration
statement under the Act to register  500,000 shares of Common Stock reserved for
issuance under the Incentive  Plan. The Company is unable to estimate the number
of shares  which may  actually be sold under Rule 144 or Rule 701 or pursuant to
registration rights, since this will depend upon the market price for the Common
Stock, the individual  circumstances of the sellers and other factors.  Any such
sales  may have an  adverse  effect on the  Company's  ability  to raise  needed
capital through an offering of its equity or convertible debt securities and may
adversely  affect  the  prevailing   market  price  of  the  Common  Stock.  See
"DESCRIPTION OF SECURITIES -- Common Stock."
    


                                       13





   
POTENTIAL ADVERSE EFFECT OF REDEMPTION OF REDEEMABLE WARRANTS; REQUIREMENT
FOR QUALIFICATION OF SHARES AND CURRENT PROSPECTUS TO EXERCISE REDEEMABLE
WARRANTS

    The  Redeemable  Warrants  may be  redeemed by the Company at any time after
thirteen  months  from the date  hereof at a price of $.20 per  Warrant  upon 30
days' prior  written  notice,  provided  that the closing  trading  price of the
Common Stock for the 20 consecutive  trading day period ending ten days prior to
the giving of notice of redemption, equals or exceeds $9.00 per share. Notice of
redemption of the  Redeemable  Warrants  could force the holders to exercise the
Redeemable  Warrants at a time when it might be disadvantageous  for the holders
to do so or to sell the  Redeemable  Warrants at their then current market price
when  the  holders  might  otherwise  wish to hold  the  Warrants  for  possible
appreciation.  Alternatively, the holders may accept the redemption price, which
is  likely to be  substantially  less than the  market  value of the  Redeemable
Warrants  at the time of  redemption.  Any  holders  who do not  exercise  their
Redeemable  Warrants  prior to  their  redemption,  will  forfeit  the  right to
purchase the shares of Common Stock underlying the Redeemable Warrants.  Holders
of the  Redeemable  Warrants  will have the right to  exercise  them to purchase
shares of Common Stock only if a current  prospectus  relating to such shares is
then in  effect  and  only if the  shares  are  qualified  for  sale  under  the
securities laws of the state or states in which the holder resides. Although the
Company  intends to seek to qualify the shares of Common  Stock  underlying  the
Redeemable Warrants for sale in those states in which they are to be offered, no
assurance  can be given  that such  qualification  will  occur.  The  Redeemable
Warrants  may be  deprived  of any value if a current  prospectus  covering  the
shares issuable upon the exercise  thereof is not filed and kept effective or if
such  underlying  shares are not,  or cannot  be,  qualified  in the  applicable
states.  While the Company may legally be permitted to give notice to redeem the
Redeemable  Warrants  at a time  when a  current  prospectus  is not  available,
thereby leaving the Redeemable  Warrant holders no opportunity to exercise their
Redeemable  Warrants prior to redemption,  the Company does not intend to redeem
the Redeemable  Warrants unless a current prospectus is available at the time of
redemption. See "DESCRIPTION OF SECURITIES -- Redeemable Warrants."

REPRESENTATIVE'S WARRANTS AND ONGOING RELATIONSHIP WITH REPRESENTATIVE

    In connection with the Offering, the Company will sell to the Representative
the  Representative's  Warrants to purchase up to 100,000 shares of Common Stock
and 100,000  Redeemable  Warrants  for a nominal  amount.  The  Representative's
Warrants  will be  exercisable  commencing on the date that is one year from the
effective date of this  Prospectus and will continue to be exercisable up to the
date that is five years from the date hereof at an exercise  price equaling 160%
of the public  offering price of the Common Stock and the  Redeemable  Warrants,
respectively.  During the term of the  Representative's  Warrants,  the  holders
thereof will be given the  opportunity to profit from a rise in the market price
of the Common  Stock or  Redeemable  Warrants  with a resulting  dilution in the
interest of the  Company's  other  stockholders.  The terms on which the Company
could obtain additional capital during the life of the Representative's Warrants
may be adversely affected because the holders of the  Representative's  Warrants
might be expected to exercise them if the Company were able to obtain any needed
additional  capital in a new offering of  securities at a price greater than the
exercise price of the  Representative's  Warrants.  The Company has also entered
into  a  consulting   agreement   with  the   Representative   under  which  the
Representative will provide certain financial consulting services to the Company
for a period of 36  months at a total  cost of  $108,000,  all of which  will be
prepaid upon  completion  of the  Offering.  See  "DESCRIPTION  OF SECURITIES --
Representative's Warrants."

    Upon the exercise of the  Redeemable  Warrants  more than one year after the
date of this Prospectus,  and to the extent not inconsistent with the guidelines
of the National  Association  of  Securities  Dealers,  Inc.,  and the rules and
regulations   promulgated  by  the  Securities  and  Exchange   Commission  (the
"Commission"),  the Company has agreed to pay the  Representative  a  commission
equal to five percent of the exercise price of the Redeemable Warrants. However,
no  compensation  will be paid to the  Representative  in  connection  with  the
exercise of the  Redeemable  Warrants if (a) the market price of the  underlying
shares of Common  Stock is lower than the  exercise  price,  (b) the  Redeemable
Warrants are  exercised in an  unsolicited  transaction,  or (c) the  Redeemable
Warrants
    


                                       14





   
subject  to  the  Representative's   Warrant  are  exercised.  In  addition,  in
connection with any  solicitation by the  Representative  after the date of this
Prospectus of Redeemable Warrant  exercises,  unless granted an exemption by the
Commission   from   Regulation  M  promulgated   under  the  Exchange  Act,  the
Representative  and any other soliciting  broker-dealer  will be prohibited from
engaging  in  any  market  making  activities  with  respect  to  the  Company's
securities for the period  commencing  either one or five business days prior to
any  solicitation of the exercise of Redeemable  Warrants until the later of (i)
the termination of such solicitation activity or (ii) the termination (by waiver
or  otherwise)  of any right which the  Representative  or any other  soliciting
broker-dealer may have to receive a fee for the exercise of Redeemable  Warrants
following  such  solicitation.  As a  result,  the  Representative  or any other
soliciting  broker-dealer  may be unable to provide a market  for the  Company's
securities,  should  it  desire  to do so,  during  certain  periods  while  the
Redeemable Warrants are exercisable. See "UNDERWRITING."
    

NO PRIOR MARKET FOR COMMON STOCK AND THE REDEEMABLE WARRANTS

    Prior to the Offering,  there has been no public market for the Common Stock
or the Redeemable Warrants, and there can be no assurance that an active trading
market will develop or be sustained after the Offering or that investors will be
able to sell the Common Stock or the Redeemable  Warrants  should they desire to
do so. The initial public offering price was determined by negotiations  between
the Company and the  Representative and may bear no relationship to the price at
which the Common Stock or the Redeemable  Warrants will trade upon completion of
the Offering. See "UNDERWRITING."

VOLATILITY OF STOCK PRICE

    The market price of the Common Stock and the  Redeemable  Warrants is likely
to be highly  volatile and could be subject to wide  fluctuations in response to
factors  concerning the Company or its competitors  such as announcements of the
results of clinical trials,  developments with respect to patents or proprietary
rights,   announcements  of  technological  innovations,  new  products  or  new
contracts, actual or anticipated variations in operating results due to a number
of factors including,  among others, the level of development expenses,  changes
in financial  estimates by  securities  analysts,  conditions  and trends in the
pharmaceutical  and  other  industries,  adoption  of new  accounting  standards
affecting  the  industry,  general  market  conditions  and other  factors.  The
Company's  operating  results  may  also be below  the  expectations  of  market
analysts and investors, which would likely have a material adverse effect on the
prevailing market price of the Common Stock or the Redeemable Warrants.

    Further,   the  stock  market  has  experienced  extreme  price  and  volume
fluctuations  that  have  particularly  affected  the  market  prices  of equity
securities of many pharmaceutical companies. These price fluctuations often have
been  unrelated  or  disproportionate  to  the  operating  performance  of  such
companies.  Market  fluctuations,  as well as general  economic,  political  and
market conditions such as recessions or international currency fluctuations, may
adversely  affect  the  market  price  of the  Common  Stock  or the  Redeemable
Warrants.  In the past,  following  periods of volatility in the market price of
the securities of companies in the  pharmaceutical  industry,  securities  class
action  litigation  has often been  instituted  against  those  companies.  Such
litigation, if instituted against the Company, could result in substantial costs
and a  diversion  of  management  attention  and  resources,  which would have a
material  adverse  effect on the Company.  The  realization  of any of the risks
described in these "RISK  FACTORS"  could have a dramatic and adverse  impact on
the market price of the Common Stock or the Redeemable Warrants.

   
IMMEDIATE AND SUBSTANTIAL DILUTION -- POTENTIALLY 80%

    Purchasers  of the Common Stock in the Offering  will suffer  immediate  and
substantial  dilution of $3.90 per share in the net  tangible  book value of the
Common  Stock  from the  initial  public  offering  price.  To the  extent  that
outstanding  options and  warrants to purchase  the  Company's  Common Stock are
exercised, there will be further dilution. See "DILUTION."
    


                                       15





NO DIVIDENDS

    The Company has never  declared  or paid any cash  dividends  on its capital
stock.  The Company  currently  does not intend to pay any cash dividends in the
foreseeable future and intends to retain its earnings, if any, for the operation
of its business. See "DIVIDEND POLICY."

   
ARBITRARY DETERMINATION OF OFFERING PRICE

    The  offering  price of the shares of Common Stock and  Redeemable  Warrants
will  be   determined   through   negotiations   between  the  Company  and  the
Representative.  Among the factors to be considered in determining the price are
prevailing market conditions, the general economic environment, estimates of the
prospects of the Company, the background and capital contributions of management
and current  conditions in the  securities  market and the  Company's  industry.
There is, however,  no relationship  between the offering price of the shares of
Common Stock and  Redeemable  Warrants  and the  Company's  assets,  book value,
historical   earnings   or  any  other   objective   criteria   of  value.   See
"UNDERWRITING."
    

ANTI-TAKEOVER EFFECTS OF CERTIFICATE OF INCORPORATION, BYLAWS AND DELAWARE LAW

   
    The Company's Certificate of Incorporation authorizes the Company's Board of
Directors (the "Board") to issue shares of undesignated  preferred stock without
stockholder approval on such terms as the Board may determine. The rights of the
holders of Common  Stock will be subject to, and may be  adversely  affected by,
the rights of the holders of any such preferred  stock that may be issued in the
future. Moreover, the issuance of preferred stock may make it more difficult for
a third party to acquire,  or may  discourage  a third party from  acquiring,  a
majority of the voting stock of the Company.  The  Company's  Board is currently
classified into three classes of directors.  With a classified  Board, one class
of  directors is elected  each year with each class  serving a three-year  term.
These and other provisions of the Certificate of  Incorporation  and the Bylaws,
as well as certain provisions of Delaware law, could delay or impede the removal
of incumbent  directors and could make more difficult a merger,  tender offer or
proxy contest involving the Company,  even if such events could be beneficial to
the interest of the  stockholders.  Such  provisions  could limit the price that
certain  investors  might be willing to pay in the future for the Common  Stock.
However,  the Company anticipates  amending its Certificate of Incorporation and
Bylaws prior to completion of the Offering to eliminate  the  classification  of
the Board, to provide that all directors elected by the holders of the Company's
Common Stock or appointed by such directors may be removed at any time,  with or
without cause, by vote of a majority of the outstanding  shares of the Company's
Common Stock, and to allow the holders of at least 10% of the outstanding shares
of  Common  Stock  to  require  the  Company  to  call  a  special   meeting  of
stockholders.  See  "DESCRIPTION  OF  SECURITIES  --  Delaware  Law and  Certain
Certificate of Incorporation and Bylaw Provisions."
    

LIMITATION ON OFFICERS' AND DIRECTORS' LIABILITIES UNDER DELAWARE LAW

   
    Pursuant to the Company's Certificate of Incorporation,  as authorized under
applicable  Delaware  law,  directors of the Company are not liable for monetary
damages for breach of fiduciary duty,  except in connection with a breach of the
duty of  loyalty,  for acts or  omissions  not in good  faith  or which  involve
intentional  misconduct or a knowing  violation of law, for dividend payments or
stock  repurchases  illegal under Delaware law or for any transaction in which a
director has derived an improper personal benefit. The Company's  Certificate of
Incorporation  provides  that  the  Company  must  indemnify  its  officers  and
directors  to the fullest  extent  permitted  by Delaware  law for all  expenses
incurred in the  settlement  of any actions  against such persons in  connection
with  their  having  served  as  officers  or  directors  of the  Company.  Upon
completion   of  the   Offering,   the  Company   also  intends  to  enter  into
indemnification  agreements with its directors which will require the Company to
provide certain  additional  indemnification  and contribution to its directors,
subject to certain  limitations.  See "MANAGEMENT -- Limitation on Officers' and
Directors' Liabilities."
    

MAINTENANCE REQUIREMENTS FOR NASDAQ SMALLCAP SECURITIES

   
    It is anticipated that the Common Stock and the Redeemable  Warrants will be
approved for listing on the Nasdaq SmallCap Market.  An issuer seeking continued
inclusion of its  securities on the SmallCap  Market is required to meet certain
criteria  including  (i) total assets of at least  $2,000,000;  (ii) capital and
surplus of at least $1,000,000; and (iii) a minimum bid price of $1.00 per share
unless the market value of its public float is at least $1,000,000 and it has at
least  $2,000,000 in capital and surplus.  Upon completion of the Offering,  the
    


                                       16





   
Company anticipates that it will satisfy the criteria for continued inclusion of
its securities on the Nasdaq SmallCap Market. However, there can be no assurance
that the Company will  continue to satisfy such  criteria and for how long.  See
"PROSPECTUS SUMMARY -- Summary Financial  Information" and "CAPITALIZATION." The
Nasdaq   SmallCap   Market  has  recently   proposed   changes  to  its  listing
requirements. If the Company became unable to meet such criteria of the SmallCap
Market and was suspended therefrom, the Company's securities could be subject to
a  rule  that  imposes   additional  sales  practice   requirements  on  certain
broker/dealers  who sell such  securities  to  persons  other  than  established
customers and accredited investors.  Consequently, an investor would likely find
it more  difficult  to dispose of, or to obtain  accurate  quotations  as to the
value of, the Securities.
    

REQUIRED DISCLOSURE CONCERNING TRADING OF PENNY STOCKS OR LOW-PRICED SECURITIES

    The  Securities  and  Exchange  Commission  (the  "Commission")  has adopted
regulations  that define a "penny  stock" to be any equity  security  that has a
market  price (as  defined  therein)  of less than $5.00 per  share,  subject to
certain exceptions.  For any transaction involving a penny stock, unless exempt,
the rules  require  the  delivery,  prior to the  transaction,  of a  disclosure
schedule  prepared by the  Commission  relating to the penny stock  market.  The
broker-dealer   also  must  disclose  the   commissions   payable  to  both  the
broker-dealer  and the  registered  representative,  current  quotations for the
securities  and,  if the  broker-dealer  is the sole  market-maker  of the penny
stock,  the  broker-dealer  must  disclose  this  fact  and the  broker-dealer's
presumed  control  over the market.  Finally,  monthly  statements  must be sent
disclosing  recent price information for the penny stock held in the account and
information on the limited market in penny stocks.

    While many securities  listed on the Nasdaq SmallCap Market would be covered
by the  definition  of penny  stock,  transactions  in such a security  would be
exempt  from all but the sole  market-maker  provision  for (i) issuers who have
$2,000,000  in  tangible  assets  ($5,000,000  if the  issuer  has  not  been in
continuous  operation for three years),  (ii) transactions in which the customer
is an institutional  accredited  investor,  and (iii)  transactions that are not
recommended  by the  broker-dealer.  In  addition,  transactions  in a  SmallCap
security  directly  with a  Nasdaq  market-maker  for such  securities  would be
subject  only to the  sole  market-maker  disclosure,  and the  disclosure  with
respect  to  commissions  to be paid  to the  broker-dealer  and the  registered
representative.  Finally,  all SmallCap securities would be exempt if The Nasdaq
Stock  Market,  Inc.,  the operator of the Nasdaq  SmallCap  Market,  raised its
requirements for continued  listing so that any issuer with less than $2,000,000
in net tangible  assets or  stockholders'  equity would be subject to delisting.
These  criteria are more stringent  than the current  maintenance  requirements.
Consequently, these rules may restrict the ability of broker-dealers to sell the
Company's  securities  and may affect  the  ability  of  purchasers  to sell the
Company's securities in the secondary market.


                SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

Statements  herein  regarding the time period during which the proceeds from the
Offering will fund the Company's  operations  and the dates on which the Company
anticipates  commencing  clinical  trials  with  respect to  Thiovir  constitute
forward-looking  statements  under the federal  securities laws. Such statements
are  subject to certain  risks and  uncertainties  that could  cause the rate at
which the Company  incurs  expenses and the actual timing of clinical  trials to
differ  materially  from  those  projected.  With  respect  to such  dates,  the
Company's  management team has made certain assumptions  regarding,  among other
things,  the successful and timely completion of preclinical tests, the approval
of an Investigational New Drug Exemption  Application ("IND") for Thiovir by the
FDA, the availability of adequate  clinical  supplies,  the absence of delays in
patient  enrollment,  the  availability  of the capital  resources  necessary to
complete  the  preclinical  tests and conduct the clinical  trials,  the nature,
scope, and number of the preclinical  tests and clinical trials required for FDA
approval  and the cost of  completing  these  tests and  trials.  The  Company's
ability to proceed  with its drug  development  program in  accordance  with the
dates  anticipated is subject to certain risks,  as discussed  under the caption
"RISK FACTORS"  contained herein, and the Company's ability to estimate the time
period for which the proceeds of the Offering will fund the Company's operations
is subject to  substantial  uncertainty  due to the factors  outlined  under the
caption "USE OF PROCEEDS" contained herein.  Undue reliance should not be placed
on the dates and time periods  referenced  herein.  These estimates are based on
the current  expectations of the Company's  management team, which may change in
the future due to a large number of potential  events,  including  unanticipated
future developments.


                                       17






                                 USE OF PROCEEDS

    The net  proceeds to the  Company  from the sale of the  Securities  offered
hereby are estimated to be approximately $4,140,000 (approximately $4,805,550 if
the Underwriters'  over-allotment  option is exercised in full), after deducting
$510,000 for underwriting discounts (approximately $586,500 if the Underwriters'
over-allotment option is exercised in full) and approximately $450,000 for other
estimated  offering  expenses   (approximately  $472,950  if  the  Underwriters'
over-allotment  option is exercised  in full),  including  the  Representative's
non-accountable  expense  allowance  and  the  consulting  fee  payable  to  the
Representative,  and  assuming no exercise of the  Redeemable  Warrants  offered
hereby.

   
    The Company intends to use the net proceeds from the Offering, including any
interest thereon, to finance research and development activities with respect to
Thiovir, primarily for preclinical tests and clinical trials designed to satisfy
FDA standards for safety and efficacy,  and to provide working  capital.  Due to
the nature of the drug development and approval  process,  the Company is unable
to  accurately  indicate the exact  amount of proceeds  allocable to each of the
Company's  activities.  The amounts actually expended for each activity may vary
significantly  depending  upon  numerous  factors,  including  the  progress  of
development  activities,  the scope  and  results  of  preclinical  testing  and
clinical  trials,  the cost,  timing and outcome of regulatory  agency  reviews,
administrative  and legal expenses,  costs of developing a patent position,  the
acquisition  of  technology  that may  enhance  and/or  be  compatible  with the
Company's then existing  technology,  the  establishment of  relationships  with
consultants  and with third  parties for  manufacturing  and sales and marketing
functions,  and on other  factors.  Commencing in 1998, the Company will also be
required  to make  minimum  royalty  payments  in  accordance  with the  license
agreement under which it licenses  rights to the drug Thiovir,  in the following
amounts: $12,500 in 1998, $25,000 in 1999, $50,000 in 2000 and $125,000 per year
thereafter.
    

    Notwithstanding  the foregoing,  however,  the information below constitutes
the  Company's  best estimate as to the use of the proceeds  generated  from the
Offering:

<TABLE>
<CAPTION>
                                    ACTIVITY                                            % OF PROCEEDS
  <S>                                                                                        <C>
  Testing and Clinical Trials                                                                 50
  CROs and Consultants                                                                        20
  General Working Capital                                                                     30
</TABLE>

    Any  net  proceeds   received   from  the  exercise  of  the   Underwriters'
over-allotment option will be used to supplement general working capital.

    The Company  believes  that the  estimated  net  proceeds  of the  Offering,
together with its existing cash and short-term investments,  will be adequate to
satisfy its anticipated capital requirements at least through December 31, 1998.
See "RISK FACTORS -- Future  Capital Needs;  Uncertainty of Additional  Funding"
and "SPECIAL NOTE REGARDING FORWARD-LOOKING  STATEMENTS." Pending such uses, the
Company intends to invest  proceeds  primarily in short-term,  investment  grade
obligations.

                                 DIVIDEND POLICY

    The Company has not declared or paid any dividends on its capital stock. The
Company  currently  intends to retain all future  earnings,  if any,  to finance
growth  and  development  of its  business  and,  therefore,  does not expect to
declare or pay any cash dividends in the foreseeable  future. The declaration of
dividends is within the discretion of the Company's  Board. See "RISK FACTORS --
No Dividends."


                                       18






                                    DILUTION

   
    At  February  28,  1997,  the net  tangible  book value of the  Company  was
$220,814,  or approximately  $.08 per share. "Net tangible book value" per share
of Common Stock  represents the amount of the Company's  total tangible  assets,
less the  amount of its total  liabilities,  divided  by the number of shares of
Common Stock outstanding.  Dilution represents the difference between the amount
per share of Common Stock paid by the new  investors  purchasing in the Offering
and the pro forma net  tangible  book value per share of Common  Stock after the
Offering. After giving effect to the sale by the Company of the 1,000,000 shares
of Common  Stock  offered  hereby at  $5.10(1)  per share and the payment of the
estimated  expenses  related  to the  Offering  of  $450,000,  the pro forma net
tangible  book  value of the  Company  at  February,  28 1997  would  have  been
$4,360,214,  or $1.20 per share of Common  Stock.  This  represents an immediate
increase  in net  tangible  book  value of $1.12 per  share of  Common  Stock to
existing  stockholders  and an  immediate  dilution of $3.90 per share of Common
Stock to new investors  purchasing Common Stock in the Offering,  as illustrated
in the following table:
    

<TABLE>
<CAPTION>
<S>                                                                    <C>     <C>
   
 Price per share in the Offering(1)                                             $ 5.10

   Net tangible book value per share before the Offering                .08
   Increase per share attributable to new investors                    1.12
                                                                       ----
Pro forma net tangible book value per share after the Offering                    1.20
                                                                                  ----
Dilution to new investors                                                       $ 3.90
                                                                                ======
</TABLE>
- ---------
(1) Includes the purchase price of $.10 per Redeemable Warrant.

    In the event that the  Underwriters  exercise the  over-allotment  option in
full,  the pro forma net tangible book value per share of Common Stock after the
Offering (less underwriting  commissions and discounts and estimated expenses of
the Offering) would be approximately $1.33 per share,  representing an immediate
increase in net tangible book value of approximately  $1.25 per share to current
stockholders and an immediate  dilution of approximately  $3.77 per share to new
investors.

    The  following  table sets  forth (i) the  number of shares of Common  Stock
purchased  from  the  Company  by  the  existing   stockholders  and  the  total
consideration  paid and the average  price per share paid for such shares by the
existing  stockholders  and (ii) the number of shares of Common Stock to be sold
by the  Company  in the  Offering,  the total  consideration  to be paid and the
average price per share:
    
<TABLE>
<CAPTION>
                                            SHARES PURCHASED         TOTAL CONSIDERATION
                                            ----------------         -------------------
                                           NUMBER    PERCENTAGE     AMOUNT      PERCENTAGE     PER SHARE
                                           ------    ----------     ------      ----------     ---------
<S>                                      <C>         <C>          <C>           <C>            <C>
New Investors                            1,000,000       27.4%    $5,000,000(2)    80.5%         $5.00
Existing Stockholders                    2,643,440       72.6%    $1,210,654       19.5%         $0.46(3)(4)
                                         ---------       ----     ----------       ----          ------- -- 
Total                                    3,643,440      100.0%    $6,210,654      100.0%
                                         =========      =====     ==========      ===== 

- ----------
(2) Prior to the deduction of expenses relating to the Offering.
(3) Excludes  $1,519,050,  representing  the excess of the fair value of 950,000
    shares  issued (in August  1996) over cash  received  of $950,  recorded  as
    research  and  development  expense.  See Note 5 of  Notes to the  Financial
    Statements hereto.
   
(4) Includes  1,950,000 shares of Common Stock previously sold for an average of
    $.05 per share and 693,440 shares of Common Stock  previously sold for $1.60
    per share.
</TABLE>

    The foregoing table excludes shares of Common Stock issuable pursuant to the
exercise of the Outstanding Warrants,  none of which are currently  exercisable.
As of April 24, 1997,  warrants  to purchase an  aggregate  of 700,000 shares of
Common  Stock at a price of $10.00  per share  were  outstanding.  None of these
warrants are currently  exercisable.  The table also  excludes  shares of Common
Stock  issuable  upon the exercise of up to 500,000  stock  options which may be
issued under the Company's Incentive Plan. As of April 24, 1997, the Company had
issued  options  to  purchase  an  aggregate  of 10,000  shares of Common  Stock
pursuant  to the  Incentive  Plan and had  made  commitments  to  three  outside
directors  and two officers to issue options to purchase an aggregate of 230,000
shares of Common Stock at exercise prices to be determined,  but in any case not
less than $5.00 per share.  See "MANAGEMENT -- Executive  Compensation and Other
Information."
    


                                       19





                                 CAPITALIZATION

   
    The following table sets forth the actual  capitalization  of the Company at
February 28, 1997, and the  capitalization of the Company as adjusted to reflect
the  sale by the  Company  of the  Securities  offered  hereby  and the  initial
application of the estimated proceeds thereof. See "USE OF PROCEEDS." This table
should be read in conjunction  with the Company's  Financial  Statements and the
Notes thereto included elsewhere herein.



<TABLE>
<CAPTION>
                                                                   FEBRUARY 28, 1997
                                                                   -----------------
                                                               ACTUAL        AS ADJUSTED
                                                               ------        -----------
<S>                                                         <C>           <C>
Stockholders' equity:
  Preferred stock -- $0.01 par value; 1,000,000 shares
   authorized, actual and as adjusted -- 0 shares issued 
   and outstanding                                          $        --     $       --

  Common Stock -- $0.01 par value; 25,000,000 shares
   authorized, actual shares issued and outstanding 
   2,643,440 and as adjusted 3,643,440                           26,434         36,434

  Additional paid-in capital                                  2,644,743      6,774,743
  Deficit accumulated during the development stage           (2,227,784)    (2,227,784)
                                                             ----------     ---------- 

     Total stockholders' equity                                 443,393      4,583,393
                                                                -------      ---------

Total capitalization                                        $   443,393     $4,583,393
                                                            ===========     ==========
    
</TABLE>


                                       20






                             SELECTED FINANCIAL DATA

   
    The  following  selected  financial  data of the  Company  as of and for the
period ended  November 30, 1996 are derived from the financial  statements  that
have  been  audited  by  McGladrey  & Pullen,  LLP,  independent  auditors.  The
Company's  financial  statements for the three months and the cumulative  period
ended February 28, 1997 are unaudited.  However,  in the opinion of the Company,
all adjustments,  consisting of normal recurring accruals,  necessary for a fair
presentation  have been made.  Interim results are not indicative of the results
to be expected for a full fiscal year.  These data should be read in conjunction
with the Company's Financial Statements and the Notes thereto included elsewhere
in this  Prospectus  and  Management's  Discussion  and  Analysis  of  Financial
Condition and Results of Operations which follow.

STATEMENT OF ACTIVITIES DATA:


<TABLE>
<CAPTION>
                                            PERIOD FROM JULY 5, 1996,      THREE MONTHS     PERIOD FROM JULY 5, 1996,
                                              DATE OF INCEPTION, TO           ENDED           DATE OF INCEPTION, TO
                                                NOVEMBER 30, 1996       FEBRUARY 28, 1997       FEBRUARY 28, 1997
                                                -----------------       -----------------       -----------------
<S>                                             <C>                     <C>                     <C>
Revenue:
   Interest income                                 $     1,858              $    2,475             $     4,333
                                                     ---------                 -------               ---------
Costs and Expense:
   Research and development                          2,058,980                  73,249               2,132,229
   General and administrative                           33,568                  66,320                  99,888
                                                     ---------                 -------               ---------
                                                     2,092,548                 139,569               2,232,117
                                                     ---------                 -------               ---------
Net loss                                            (2,090,690)               (137,094)             (2,227,784)
                                                    ==========                ========              ========== 
Net loss per common share(1)                       $      (.81)             $     (.05)            $      (.86)
                                                   ===========              ==========             =========== 
Shares used in computing net loss per common
  share(1)                                           2,593,440               2,593,996               2,593,668
                                                     =========               =========               =========

BALANCE SHEET DATA:

                                                                 NOVEMBER 30, 1996      FEBRUARY 28, 1997
                                                                 -----------------      -----------------
Cash and cash equivalents                                           $   495,421           $   213,029
Working capital                                                         503,621               431,362
Total assets                                                            532,005               502,625
Deficit accumulated during the development stage                     (2,090,690)           (2,227,784)
Total stockholders' equity                                              510,487               443,393

</TABLE>
- -----------
(1) See  notes  1  and  4 of  Notes  to  Financial  Statements  for  information
    concerning  the  computation of net loss per common share and shares used in
    computing net loss per common share.
    

                                       21





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

    The following should be read in conjunction  with "SELECTED  FINANCIAL DATA"
and the Company's Financial  Statements and Notes thereto appearing elsewhere in
this Prospectus.

OVERVIEW

    The Company is a development  stage  pharmaceutical  company  engaged in the
development of a single new antiviral drug candidate called Thiovir. The Company
was incorporated in 1988 but remained a "shell" corporation, i.e. without assets
or liabilities,  until July 1996, when it commenced the acquisition of a license
of certain proprietary rights to, and the development of, Thiovir.

   
    The Company is a  development  stage  company,  has not derived any revenues
from the sale of products and has relied upon private  equity  financing for its
capital.  As of  February  28,  1997,  the  Company's  accumulated  deficit  was
$2,227,784.
    

    The Company has no operating history upon which an evaluation of the Company
and its prospects can be based. The risks, expenses and difficulties encountered
by companies at an early stage of development must be considered when evaluating
the  Company's  prospects.  There are numerous  risks  inherent in a development
stage company which is reliant upon the  development of a single  pharmaceutical
product,  including the uncertainties of research and the outcome of preclinical
testing  and  clinical  trials,  a lengthy  and  expensive  regulatory  approval
process,  obtaining and defending a satisfactory patent position, and attracting
and retaining motivated and qualified personnel. See "RISK FACTORS."

    The operating expenses of the Company cannot be predicted with certainty and
will  depend  on  several  factors,  primarily  the  level  of drug  development
expenses.  Development  expenses  will depend on the progress and results of the
Company's  development,  preclinical tests and clinical trials of Thiovir, which
cannot be predicted. Management may be able to control the timing of development
expenses  in  part by  accelerating  or  decelerating  preclinical  testing  and
clinical  trial  activities,  although  attainment  of  the  Company's  business
objectives may necessitate pursuit of these activities on an accelerated basis.

RESULTS OF ACTIVITIES

   
PERIOD FROM INCORPORATION TO JULY 5, 1996, DATE OF INCEPTION

    For the period from  incorporation  (1988) through July 5, 1996, the Company
was  inactive,  had no capital  funds,  received  no  revenues  and  incurred no
expenses.
    

PERIOD FROM JULY 5, 1996, DATE OF INCEPTION, TO NOVEMBER 30, 1996

    The Company had interest  income of $1,858 in the period ended  November 30,
1996.

   
    In August  1996,  the  Company  purchased  an option to acquire a license of
certain rights to the drug Thiovir. For the option, the Company paid $100,000 in
cash and issued to the grantor of the option  200,000 shares of Common Stock and
warrants  to  purchase  an  additional  200,000  shares  of  Common  Stock.  The
recipients  of the shares of Common  Stock and the  warrants  paid the Company a
total  of $200 for  these  securities.  Also in  1996,  the  Company  issued  an
additional 750,000 shares of Common Stock to Charles E. McKenna,  Ph.D. (320,000
shares),  Mary  Anthony  Gray  (110,000  shares)  and Thomas D.  Wolfe  (320,000
shares), for aggregate cash consideration of $750. Management estimated the fair
value of the 950,000 shares at $1.60 per share for a total of $1,520,000,  based
upon the offering  price of the  Company's  Common Stock in a private  placement
offering  commenced on August 20, 1996. In September 1996, the Company exercised
its option to acquire the  license of rights to Thiovir  and paid an  additional
$440,000 in cash  therefor.  The  Company  charged  the  difference  between the
estimated  aggregate  value and the aggregate cash purchase price of the 950,000
shares, or $1,519,050, and the cash consideration paid of approximately $540,000
for the licensing  rights,  as research and  development  expense.  See "CERTAIN
RELATIONSHIPS AND RELATED TRANSACTIONS."
    


                                       22




    General and administrative expenses totaled $33,568, primarily consisting of
compensation, travel and office expense.

   
    The Company  incurred a net loss of $2,090,690 for the period ended November
30, 1996.

 THREE MONTHS ENDED FEBRUARY 28, 1997

    The Company had interest  income of $2,475 in the quarter ended February 28,
1997.

    Research and development  expense for the quarter was $73,249,  reflecting a
research grant to USC pursuant to a new research agreement which continues until
at least September 30, 1997. See "BUSINESS -- Research Agreement with USC."

    General and  administrative  expenses  for the  quarter  were  $66,320,  the
largest components of which were personnel compensation of $17,538 and legal and
consulting expenses of $21,800. The level of general and administrative expenses
for  the   quarter  was  higher  than  prior   periods   because  of   increased
administrative  and  management  activity in the  planning and  preparation  for
additional tests and clinical trials for Thiovir.

    The Company  incurred a net loss of $137,094 for the quarter ended  February
28,  1997,  resulting  in an  accumulated  deficit  of  $2,227,784  during  this
development stage of the Company.

    LIQUIDITY AND CAPITAL RESOURCES

    The Company has financed its  activities  since July 5, 1996  primarily from
the net proceeds of private placements of Common Stock. As of February 28, 1997,
the Company had received  aggregate cash proceeds of  $1,210,654.  In July 1996,
three stockholders of the Company  contributed a total of $100,200 to the equity
capital of the Company.  In October 1996, the Company paid cash of $539,930 and,
in August  1996,  issued  shares of its Common  Stock with a value,  net of cash
consideration  received for the shares,  of  $1,519,050 in  consideration  for a
license of certain rights to Thiovir.  In October 1996, the Company  completed a
private  placement  of  665,000  shares at $1.60 per share for net  proceeds  of
$1,015,473, of which $34,496 was receivable at November 30, 1996 and paid in the
quarter  ended  February 28,  1997.  An  additional  $45,504 was received in the
quarter  ended  February  28, 1997 from the sale of shares of Common  Stock to a
single  investor  at $1.60 per  share.  At  February  28,  1997,  the  Company's
liquidity consisted of total cash and cash equivalents of $213,029.

    The  Company   expects   that  its  capital   requirements   will   increase
substantially  in future  periods  as the  Company  funds  its drug  development
program.  The Company's future capital requirements will depend on many factors,
including the progress of the Company's drug development  program, the scope and
results of preclinical testing and clinical trials, the cost, timing and outcome
of regulatory  reviews,  costs of patent  prosecution,  administrative and legal
expenses,  the establishment of capacity for sales and marketing functions,  the
establishment of relationships  with third parties for  manufacturing  and sales
and marketing functions, and other factors. Commencing in 1998, the Company will
also be required to make minimum royalty payments in accordance with the license
agreement  under which it licenses  rights to the drug Thiovir in the  following
amounts: $12,500 in 1998, $25,000 in 1999, $50,000 in 2000 and $125,000 per year
thereafter.
    

    The Company believes that the net proceeds of the Offering together with its
existing  cash and  short-term  investments  will be  adequate  to  satisfy  its
anticipated capital requirements through at least December 31, 1998. The Company
expects that it may be required to raise  substantial  additional  funds through
equity or debt financings, collaborative arrangements with corporate partners or
from other sources.  There can be no assurance that  additional  funding will be
available  on  favorable  terms from any of these  sources or at all.  See "RISK
FACTORS -- Future Capital Needs; Uncertainty of Additional Funding" and "SPECIAL
NOTE REGARDING FORWARD-LOOKING STATEMENTS."

    For a discussion of the Company's plan of operation, see "USE OF PROCEEDS."


                                       23




                                    BUSINESS

OVERVIEW

   
    The Company is a development  stage  pharmaceutical  company  engaged in the
development of  thiophosphonoformic  acid ("TPFA"), an anti-viral compound,  for
which the Company has adopted the trade name "Thiovir(tm)." The initial focus of
the  Company's  development  activities  will be to  demonstrate  the safety and
efficacy of Thiovir for  treatment  of patients  infected  with HIV and patients
showing active  infection of CMV, which causes  blindness and other  conditions.
CMV is a  common  opportunistic  infection  among  AIDS  patients.  The  Company
believes that Thiovir,  if successfully  developed and approved for sale,  would
constitute a candidate  for inclusion in  combination  drug therapy for HIV/AIDS
treatment and would provide several  benefits over existing  treatments for CMV,
particularly its potential ability to replace more toxic  intravenous  treatment
with a less toxic oral treatment.  The only  development work on Thiovir to date
has been limited to laboratory  and animal  studies  conducted by USC, which has
licensed to the Company its proprietary rights to Thiovir, and by other academic
and/or  research  organizations  which  have no  affiliation  with the  Company.
Therefore, Thiovir is in an early stage of development.
    

    In the  United  States,  the use and sale of Thiovir is subject to the rules
and  regulations  of the FDA, and  obtaining  the  necessary  FDA approval  will
require  substantial  preclinical tests and clinical trials. The Company expects
to commence  clinical  trials for Thiovir in 1997.  The  Company  believes  that
Thiovir may meet the criteria  established by the FDA for accelerated  approval.
As a result, the Company may be able to commercialize  Thiovir in a shorter time
period than has  historically  been applicable for a drug that does not meet the
criteria for accelerated approval. See "BUSINESS -- Government Regulation."

    Initially,   the   Company   intends  to   maintain   a  limited   corporate
infrastructure    devoted   almost    exclusively   to   the   development   and
commercialization  of  Thiovir.  Accordingly,  the  Company  will engage CROs to
conduct preclinical tests and clinical trials on Thiovir.  The Company will also
contract with other  companies to manufacture  the drug. The Company  intends to
rely upon  part-time  consultants  and CROs to provide  expertise  in  designing
appropriate  tests and trials and in seeking FDA and other government  approval.
Furthermore,  the Company  does not believe that it will be necessary to develop
an  extensive  sales and  marketing  force to promote the sale of Thiovir in the
United States, if and when it may be sold, since the market for HIV/AIDS and CMV
therapies is concentrated among a relatively small number of care providers.

   
    In August  1996,  the Company  acquired an  exclusive  worldwide  license to
proprietary  rights  to  Thiovir  held by USC from a limited  partnership  which
funded the research and  development  of Thiovir.  The Company has  generated no
revenues  from the  sale of  products  and,  as of  February  28,  1997,  has an
accumulated  deficit of  $2,227,784.  There can be no assurance that the Company
will ever achieve profitable operations.

    The Company's  executive  offices are located at 10940  Wilshire  Boulevard,
Suite 1600, Los Angeles, California, pursuant to a short-term lease. The Company
expects to relocate its offices,  most likely in the Southern California region,
as it hires additional employees to staff increased  operational  activity.  The
Company is a Delaware  corporation  and is the successor by merger to a Missouri
corporation  which  was  originally  formed  in 1988,  but  remained  a  "shell"
corporation with no operations,  assets or liabilities  until its acquisition of
license rights to TPFA.
    

TARGETED INDICATIONS FOR THIOVIR

   
    HIV/AIDS.  HIV is the viral  infection  which causes AIDS. HIV replicates in
the body,  resulting  in an  increasing  amount of the virus  referred  to as an
increase in the "viral  load."  AIDS  occurs  when the HIV viral load  reaches a
sufficiently  high level to  significantly  compromise  the immune system and/or
when certain opportunistic infections (such as CMV) occur. The treatment of AIDS
has  increasingly  focused on inhibiting  two enzymes,  known as "protease"  and
"reverse  transcriptase"
    



                                       24




   
("RT"),  the activity of which are necessary to the process of HIV  replication.
Initially,  AIDS was treated with a single drug (referred to as  "monotherapy"),
such as AZT,  which is a  nucleoside  RT  inhibitor.  Experience  has shown that
monotherapy  results in the rapid emergence of a mutated form of the virus which
is resistant to the drug.  More recently,  the treatment of HIV/AIDS has focused
on the  use of  combinations  of  protease  and RT  inhibitors  (referred  to as
"combination  therapy") which has  significantly  reduced the viral load in many
cases.
    

    The long-term  efficacy of the drugs now being used to reduce HIV viral load
is an  unresolved  issue.  Resistance  to  one  or  more  drugs  being  used  in
combination drug therapy has been  increasingly  recognized in some patients due
to HIV's ability to mutate.  Patient  compliance  has also been  recognized as a
problem with combination  drug therapy because the treatment  regimen is complex
and demanding and often results in serious, unwanted side effects.  According to
published reports, the recently-introduced  combination drug therapies have been
least effective among patients who had previously been subjected to a regimen of
AZT or other nucleoside RT inhibitors.  Consequently,  the search for new drugs,
and for new combinations of drugs for the treatment of HIV/AIDS, continues at an
intense level of activity.

   
    Thiovir is a non-nucleoside  RT inhibitor that has inhibited the replication
of HIV in  laboratory  tests.  Thiovir is at least  partially  metabolized  into
foscarnet  in vitro  in  cells  and in dogs and  cats.  Therefore,  the  Company
believes  that  Thiovir  may  likewise  be  partially  converted  to the  active
ingredient  in  foscarnet in human  patients.  Although  foscarnet  has not been
widely  used to treat  HIV/AIDS  because  of the need  for  central  intravenous
administration,  it has been recognized to inhibit HIV replication in some human
patients.  Consequently,  the Company  believes  that the  potential  exists for
Thiovir to be an attractive  candidate for inclusion in combination drug therapy
for HIV/AIDS for the following reasons:
    

    * The resistance to combination drug therapies  exhibited among patients who
      had previously undergone therapy with a nucleoside RT inhibitor may not be
      exhibited   when  the   nucleoside   RT  inhibitor  is  replaced   with  a
      non-nucleoside RT inhibitor.

   
    * If Thiovir  were to prove  effective  in treating  both  HIV/AIDS and CMV,
      physicians  may  include  Thiovir in a  combination  drug  therapy for its
      double effect of treating HIV/AIDS and, on a prophylactic basis, CMV.


    CMV.  CMV  is a  virus  which  resides  in  most  human  beings.  It  is  an
opportunistic  virus  that may become  active  when the human  immune  system is
weakened.  Consequently,  AIDS patients are at  considerable  risk of active CMV
infection.  The primary manifestation of active CMV infection,  estimated at 85%
of all  manifestations,  is in the retina of the eye (CMV retinitis).  Other CMV
manifestations include  gastrointestinal  infection (symptoms include ulcers and
chronic   diarrhea)   and   neurologic   infection   (encephalitis   and   other
complications). If untreated, CMV retinitis causes blindness. Treatment controls
but does not eliminate CMV, so ongoing therapy is generally necessary.

    Until recently,  physicians  typically treated CMV retinitis with two drugs,
foscarnet  and  ganciclovir.  In June  1996,  the  FDA  approved  a third  drug,
cidofovir, for treatment of CMV retinitis. The Company is aware of several other
drugs which are under development for the treatment of CMV retinitis. Foscarnet,
which exhibits renal  toxicity,  is generally  administered  intravenously  on a
daily basis by means of a surgically-implanted  central intravenous line because
it is not absorbed by the intestine. This precludes oral administration. Central
intravenous drug therapy is  substantially  more burdensome and costly than oral
drug therapy. Ganciclovir is available in oral and intravenous forms and is also
administered by a device surgically  implanted in the eye for sustained release.
Oral  administration,  however, is typically used only after an induction period
of central intravenous administration.  The use of an eye implant alone, without
simultaneous systemic therapy, often results in the development of CMV retinitis
in the other eye and/or  manifestations  of active CMV infection in the internal
organs.  CMV has  developed  resistance  to  ganciclovir  in some  patients.  In
addition,  ganciclovir has exhibited bone marrow toxicity in some cases, as does
the often-used HIV/AIDS drug AZT. Consequently,  simultaneous use of ganciclovir
and AZT has been reported to cause profound bone marrow  suppression,  resulting
in the inability to fight  infection.  Patients who use  ganciclovir may require
administration  of immune  cell  enhancement  drugs in order to  counteract  the
adverse effects of ganciclovir.  Cidofovir is  administered  intravenously  and,
like foscarnet (and Thiovir), exhibits renal toxicity.



                                       25





    There is  substantial  ongoing  research  into and  clinical  trials  of new
treatment  methods using existing drugs,  including  intravitreal  injection and
administration of various combinations of these drugs. The Company is also aware
of several  other drugs which are under  development  for the  treatment  of CMV
retinitis.
    
    The Company believes that, with the exception of oral  ganciclovir,  none of
the drugs described above are currently  administered  prophylactically prior to
manifestation of CMV retinitis.

   
    The molecular  structure of Thiovir is identical to that of foscarnet except
that a single  oxygen  atom in  foscarnet  is  replaced  with a  sulfur  atom in
Thiovir.   To  date,   laboratory  in  vitro  tests   conducted  by  independent
laboratories  on human cell  cultures  indicate  that at certain  concentrations
Thiovir is similar to foscarnet in  inhibiting  CMV  replication.  The potential
exists,  therefore,  that the  application  of Thiovir  will result in a "double
hit," i.e., the portion of Thiovir that  transforms to foscarnet and the portion
that retains its original  chemical  structure would both be present in the body
to control the CMV virus.
    
    The Company believes that the potential exists for the following benefits to
the use of Thiovir in the treatment of CMV:

   
    * Thiovir may be  administered  orally.  Initial animal studies suggest that
      Thiovir will  demonstrate  sufficient oral  availability  to humans.  Oral
      dosage is  substantially  less intrusive and burdensome  than  intravenous
      administration.
    
    * While Thiovir  exhibits some renal  toxicity,  preliminary  animal studies
      suggest  that  Thiovir  may  involve  a lesser  degree of  adverse,  toxic
      consequences than other drugs currently being used.
   
    * Use of Thiovir may be significantly less costly than alternative drugs for
      many patients because it avoids intravenous  administration and the use of
      immune cell enhancement drugs would not be required.
    

    THE  DEVELOPMENT  OF THIOVIR IS IN AN EARLY  STAGE.  TO DATE,  ONLY  LIMITED
LABORATORY  AND ANIMAL  STUDIES HAVE BEEN  CONDUCTED ON THIOVIR.  FURTHER TESTS,
INCLUDING  HUMAN  CLINICAL  TRIALS,  WILL BE NECESSARY TO  DEMONSTRATE  THE ORAL
BIO-AVAILABILITY,  THE EFFICACY AND THE TOXICITY AND OTHER SAFETY  ATTRIBUTES OF
THE USE OF  THIOVIR  FOR THE  TREATMENT  OF  HIV/AIDS  AND CMV.  THERE CAN BE NO
ASSURANCE  THAT SUCH TESTS WILL  ESTABLISH  THAT USE OF THIOVIR  WILL  RESULT IN
THESE BENEFITS.  SEE "RISK FACTORS -- UNCERTAINTY OF PRODUCT  DEVELOPMENT" AND "
- -- UNCERTAINTIES RELATED TO CLINICAL TRIALS."


RESEARCH AND DEVELOPMENT STATUS AND ACTIVITIES

    Research and development  with respect to Thiovir has been performed to date
primarily  at USC under the  direction  of  Professor  Charles E.  McKenna.  See
"MANAGEMENT -- Executive Officers, Directors and Key Consultants" and "PRINCIPAL
STOCKHOLDERS."  In  1994,  PerArdua   Investors,   L.P.,  a  California  limited
partnership (the "Limited  Partnership"),  was formed to fund the development of
Thiovir  through  research  grants  extended  to USC.  The  Limited  Partnership
obtained certain rights to obtain an exclusive  license of the patents and other
intellectual  property rights relating to Thiovir  developed at USC. The Company
acquired such rights in August 1996. See "BUSINESS -- Relationship with USC" and
"CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS."

    In vitro studies conducted at USC have demonstated the ability of Thiovir to
inhibit replication of HIV and CMV and indicated  preliminarily that Thiovir may
have favorable oral  bio-availability as compared to CMV drugs currently in use.
An effective  and  relatively  simple  method of  synthesizing  Thiovir was also
developed at USC. The  proprietary  rights of which the Company is the exclusive
licensee include a United States patent for the use of Thiovir for the treatment
of HIV, a U.S.  patent on a method of  synthesis  of Thiovir,  a pending  patent
application, and certain other patent rights. See "BUSINESS -- Patents."

    The Company plans to continue the research and development of Thiovir with a
view to obtaining FDA and other government  approval for its sale and use in the
treatment of HIV/AIDS and active CMV  infection  and to  investigate  additional
potential therapeutic uses.

    The Company is currently  developing  standard operating  procedures for the
production of Thiovir pursuant to GMPs which will meet FDA requirements,  and is
designing and planning laboratory and animal



                                       26



   
studies  intended to satisfy Phase I requirements  of the FDA approval  process.
Those studies, similar in some cases to the studies already conducted, will have
the  objective of  establishing  the  chemical  stability of the product and its
toxicity and tolerance properties. Mutagenicity, immunogenicity and teragenicity
studies may also be  performed  if deemed  necessary.  The  Company  expects the
completion  of these studies and the Phase I process to take one year or longer.
The  production  of Thiovir  under GMP  standards and the conduct of the Phase I
studies  will be  performed on behalf of the Company by CROs who have not as yet
been identified by the Company.  The results of the studies performed during the
Phase I process will be  submitted  to the FDA as part of an IND,  which must be
evaluated  and found  acceptable  by the FDA before  human  clinical  trials may
commence. See "BUSINESS -- Government Regulation."
    

RESEARCH AGREEMENT WITH USC

    The  Company  has  recently  entered  into  a new  research  agreement  (the
"Research  Agreement") with USC with respect to Thiovir.  The primary objectives
of the research to be conducted by USC include the following:

    * to acquire  initial in vitro data relating to the potential use of Thiovir
      with  other  HIV  and/or  CMV  inhibitor  drugs  as part of a  combination
      therapy;

   
    * to conduct additional research into other potential applications of
      Thiovir; and
    

    * to transfer to the Company  technology  related to Thiovir and to continue
      patent filings related to Thiovir.

    The  research at USC will be  conducted  under the  direction  of  Professor
McKenna and will continue  until at least  September  30, 1997.  The research is
being funded by a grant of approximately $176,000 which has already been paid by
the Company. See "CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS."

POTENTIAL MARKET FOR THIOVIR

   
    Market Size. The World Health Organization estimated at the end of 1996 that
there were more than 22 million people infected with HIV worldwide, of whom more
than eight million had  developed  AIDS.  The United States  Centers for Disease
Control and  Prevention  has  disclosed  that  through  December  1995 more than
500,000  persons in the United States with AIDS had been reported to it and that
approximately  343,000 of them had died.  There are no  reliable  figures on the
number of AIDS  patients  in the United  States or in the world with  active CMV
infection. All HIV/AIDS patients represent the potential market for Thiovir.

    Thiovir,  as  well  as the  other  known  drugs  used to  treat  active  CMV
infection,  will not "cure" CMV; its use would merely suppress viral replication
and spread of the virus. Consequently, use of Thiovir would be on-going. Because
active CMV infection  typically  becomes manifest within a patient in the latter
stages of AIDS infection, the use of drug therapy to control CMV, at least until
recently,  was  inevitably  shortened by the death of the patient.  Treatment of
AIDS patients  using  combination  drug  therapy,  however,  has recently  shown
significant  clinical  benefits  including  reduced HIV viral load and increased
patient longevity.  There is insufficient published information to determine the
degree to which active CMV infection may have gone into  remission in those AIDS
patients who have benefited from  combination  drug therapy.  Anecdotal  reports
indicate that active CMV  infection is not  significantly  affected  among those
patients.

    The  Company is not aware of  published  data which  indicate  the extent to
which new cases of active  CMV  infection  have been  reduced as a result of the
recent  success of  combination  drug therapy  among HIV  patients.  The Company
believes,  however,  and  anecdotal  reports  confirm,  that to the extent  that
combination drug therapy, or any other therapy,  significantly reduces the viral
load of HIV  patients,  the number of new patients with active CMV infection has
been and will be proportionately reduced. Consequently, the demand for CMV drugs
may be  significantly  diminished at the time,  if ever,  the Company is able to
market Thiovir. See "RISK FACTORS -- Uncertainty of Market Demand for Thiovir."
    



                                       27




    Competition.  The  segment  of the  pharmaceutical  industry  engaged in the
treatment of HIV/AIDS and associated  viruses such as CMV is highly  competitive
and rapidly changing. If successfully developed and approved as either an CMV or
HIV drug, or for both indications, Thiovir would compete with numerous therapies
now in existence and currently in development.

   
    Regarding CMV,  foscarnet is marketed under the name  "Foscavir(R)" by Astra
Pharmaceuticals,  ganciclovir  is marketed under the name  "Cytovene(R)"  by the
Syntex Division of Hoffman LaRoche and under the name  "Vitrasert(tm)" by Chiron
Vision,  and  cidofovir  is  marketed  under  the name  "Vistide(R)"  by  Gilead
Sciences.  All four companies possess vastly greater  organizations,  experience
and resources than the Company. See "RISK FACTORS -- Intense  Competition;  Risk
of  Technological  Change." The rights to other drugs known by the Company to be
the subject of testing for FDA approval for  treatment of CMV retinitis are held
by Isis Corporation,  Gilead Sciences, Bristol Myers-Squibb and Glaxo- Wellcome.
Other  drugs  that are not  known to the  Company  may be in  various  stages of
development and testing.

    Distributors  of HIV/AIDS  drugs which have been approved by the FDA include
Glaxo-Wellcome,   Agouron  Pharmaceuticals,   Gilead  Sciences,   Merck,  Abbott
Laboratories,  Hoffman LaRoche,  Bristol- Myers Squibb and Boehringer-Ingelheim.
These, as well as other companies which can be expected to gain FDA approval for
HIV/AIDS drugs, possess vastly greater  organizations,  experience and financial
resources than the Company.
    

    The  competitive  factors which the Company expects to encounter when and if
it  obtains  government  approval  for the sale of  Thiovir  are  primarily  the
demonstrated efficacy of a product,  ease of drug administration,  the product's
compatibility  with other drugs being  administered  to HIV/AIDS  patients,  the
relative degree of a product's  adverse side effects,  and the cost of using the
drug,  which would include  associated costs of  administration  and the cost of
drugs that might be taken to ameliorate adverse side effects.

SALES AND MARKETING

   
    The Company has not yet  formulated a specific  marketing and sales plan for
Thiovir when and if it obtains government approval for Thiovir.  Similarly,  the
Company has no marketing or sales personnel.  In the United States,  the medical
care of a  substantial  percentage  of HIV/AIDS  patients is  concentrated  in a
relatively small number of medical facilities located in urban centers and there
is an extensive flow of information  within the medical community that regularly
provides care to HIV/AIDS patients regarding the safety and efficacy of existing
and newly-developed  therapies.  Moreover,  HIV/AIDS patients support groups are
active and themselves constitute a source of information on drug therapies.  The
Company intends to provide  information to the HIV/AIDS medical community and to
support  groups on a continuous  basis with respect to its progress,  if any, in
further developing Thiovir.  The Company does not expect that a large and costly
marketing and advertising  program will be necessary to acquaint the marketplace
with Thiovir when and if it obtains FDA approval for its sale and use.
    

MANUFACTURING

    The Company does not have any manufacturing  capacity or relationships  with
third parties and currently  plans to seek to establish a  relationship  with an
unrelated  third  party  manufacturer  for the  manufacture  of  clinical  trial
material and, in the event FDA approval is received,  the commercial  production
of Thiovir. There can be no assurance that the Company will be able to establish
a relationship with a third party manufacturer on commercially  acceptable terms
or that a third party  manufacturer  will be able to  manufacture  products on a
cost-effective  basis in commercial  quantities  under GMPs mandated by the FDA.
The Company does believe, however, that the relatively simple chemical structure
of Thiovir and the methods of synthesizing Thiovir which have been developed and
licensed to the Company will allow an  efficient,  reliable  and  cost-effective
manufacturing process. Nevertheless, the Company's dependence upon third parties
for  manufacturing  may adversely  affect the Company's  profit  margins and its
ability to develop and commercialize  Thiovir on a timely and competitive basis.
Further,  there  can be no  assurance  that  manufacturing  or  quality 



                                       28




control problems will not arise in connection with the manufacture of Thiovir or
that a  third  party  manufacturer  will  be  able  to  maintain  the  necessary
government  licenses  and  approvals to continue  manufacturing.  Any failure to
establish a relationship with a third party for its  manufacturing  requirements
on  commercially  acceptable  terms would have a material  adverse effect on the
Company.  See "RISK FACTORS -- Dependence on Third Parties for  Development  and
Manufacturing" and "BUSINESS -- Government Regulations."

GOVERNMENT REGULATION

    The manufacture and sale of Thiovir are subject to government regulations in
the United States and in certain foreign  countries.  In the United States,  the
Company is subject to the rules and regulations established by the FDA requiring
the  presentation of data  indicating  that the Company's  products are safe and
efficacious and are  manufactured in accordance with the FDA's GMP  regulations.
Safety and effectiveness standards are required in certain other countries.  The
Company believes that only a limited number of foreign  countries have extensive
regulatory  requirements,  specifically  the countries  comprising  the European
Union and Japan.

    The  steps  required  to be  taken  before  a new  prescription  drug may be
marketed in the United  States  include (i)  preclinical  laboratory  and animal
tests,  (ii) the  submission  to the FDA of an IND,  which must be evaluated and
found  acceptable by the FDA before human  clinical  trials may commence,  (iii)
adequate and  well-controlled  human clinical trials to establish the safety and
effectiveness  of the drug, (iv) the submission of an NDA to the FDA and (v) FDA
approval of the NDA.  Prior to obtaining FDA approval of an NDA, the  facilities
that will be used to manufacture the drug must undergo a preapproval  inspection
to ensure compliance with the FDA's GMP regulations.

    Preclinical  tests include  laboratory  evaluation of product  chemistry and
animal  studies to assess the safety and  effectiveness  of the  product and its
formulation.  The results of the  preclinical  tests are submitted to the FDA as
part of an IND,  and unless the FDA  objects,  the IND will become  effective 30
days  following  its  receipt  by the FDA.  If the FDA has  concerns  about  the
proposed clinical trial, it may delay the trial and require modifications to the
trial protocol prior to permitting the trial to begin. As a result, there can be
no assurance that the FDA will permit a proposed IND to become effective.

    Clinical trials involve the administration of the pharmaceutical  product to
healthy  volunteers or to patients  identified as having the condition for which
the pharmaceutical is being tested. The pharmaceutical is administered under the
supervision of a qualified principal investigator. Clinical trials are conducted
in accordance with protocols  previously submitted to the FDA as part of the IND
that detail the objectives of the trial,  the parameters  used to monitor safety
and the efficacy  criteria  that are being  evaluated.  Each  clinical  trial is
conducted  under the auspices of an  Institutional  Review Board  ("IRB") at the
institution at which the trial is conducted.  There IRB  considers,  among other
things  ethical  factors,  the  safety of the human  subjects  and the  possible
liability risk for the institution.

    Clinical trials are typically  conducted in three sequential phases that may
overlap. In Phase I, the initial introduction of the pharmaceutical into healthy
human  volunteers,  the  emphasis  is on testing for safety  (adverse  effects),
dosage tolerance, metabolism, distribution, excretion and clinical pharmacology.
Phase II  involves  trials in a limited  patient  population  to  determine  the
effectiveness  of the  pharmaceutical  for  specific  targeted  indications,  to
determine dosage  tolerance and optimal dosage and to identify  possible adverse
side  effects  and safety  risks.  In serious  diseases  such as AIDS,  patients
suffering  from the disease  rather than healthy  volunteers are used in Phase I
trials.  In addition,  Phase I trials may be divided  between Phase Ia, in which
single doses of the drug are given,  and Phase Ib, in which  multiple  doses are
given.  In the  latter  instance,  some  efficacy  data may be  obtained  if the
subjects are patients suffering from the disease rather than healthy volunteers,
and these  trials are referred to as "Phase  Ib/IIa."  After a compound has been
shown in Phase II trials  to have an  acceptable  safety  profile  and  probable
effectiveness,   Phase  III  trials  are   undertaken   to   evaluate   clinical
effectiveness  further and to further test for safety within an expanded patient
population at multiple  clinical study sites.  The FDA reviews both the clinical
trial plans and the results of the trials at each phase and may  discontinue the
trials at any time if there are significant safety issues.

    The results of the  preclinical  tests and clinical  trials are submitted to
the FDA in the form of an NDA for marketing  approval.  The testing and approval
process  is likely to  require  substantial  time and effort and



                                       29





there can be no  assurance  that any FDA  approval  will be  granted on a timely
basis or at all.  The  approval  process  is  affected  by a number of  factors,
including  the  severity  of  the  disease,   the  availability  of  alternative
treatments  and  the  risks  and  benefits   demonstrated  in  clinical  trials.
Additional  animal  studies or clinical  trials may be requested  during the FDA
review process and may delay marketing  approval.  Upon approval,  a drug may be
marketed only for the approved indications in the approved dosage forms. Further
clinical  trials would be necessary to gain  approval for the use of the product
for any  additional  indications  or  dosage  forms.  The FDA may  also  require
post-market  reporting and may require surveillance programs to monitor the side
effects of the drug, which may result in withdrawal of approval.

    Many foreign  countries also regulate the clinical  testing,  manufacturing,
marketing and use of pharmaceutical  products.  The requirements relating to the
conduct of clinical trials, product approval, manufacturing,  marketing, pricing
and reimbursement vary widely from country to country. There can be no assurance
that the  Company or any third  parties  with which the  Company  may  establish
collaborative  relationships will be able to attain or maintain  compliance with
such requirements.

    The FDA has  developed  several  regulatory  procedures  to  accelerate  the
clinical   testing  and  approval  of  drugs   intended  to  treat   serious  or
life-threatening  illnesses under certain  circumstances.  For example, in 1988,
the FDA issued regulations to expedite the development, evaluation and marketing
of drugs for life-threatening and severely  debilitating  illnesses,  especially
where no alternative therapy exists (the "1988  Regulations").  These procedures
encourage  early  consultation  between  the  IND  sponsors  and  the FDA in the
preclinical testing and clinical trial phases to determine what evidence will be
necessary  for  marketing  approval  and to assist  the  sponsors  in  designing
clinical trials. Under this program, the FDA works closely with the IND sponsors
to accelerate and condense Phase II clinical  trials,  which may, in some cases,
eliminate  the need to conduct  Phase III trials or limit the scope of Phase III
trials. Under the 1988 Regulations,  the FDA may require post-marketing clinical
trials (Phase IV trials) to obtain  additional  information on the drug's risks,
benefits and optimal use.

    In 1992, the FDA issued regulations establishing an accelerated NDA approval
procedure  for  certain  drugs  under  Subpart H of the  agency's  NDA  approval
regulations  ("Subpart H  Regulations").  The Subpart H Regulations  provide for
accelerated   NDA  approval  for  new  drugs   intended  to  treat   serious  or
life-threatening  diseases  where the drugs  provide  a  meaningful  therapeutic
advantage over existing  treatment.  Under this accelerated  approval procedure,
the FDA may approve a drug based on evidence from  adequate and  well-controlled
studies of the drug's  effect on a surrogate  endpoint that  reasonably  suggest
clinical  benefits,  or on evidence of the drug's effect on a clinical  endpoint
other than survival or irreversible  morbidity.  This approval is conditional on
the  favorable  completion  of trials to  establish  and  define  the  degree of
clinical  benefits to the patient.  Such  post-marketing  clinical  trials would
usually be underway  when the product  obtains this  accelerated  approval.  If,
after approval,  a post-marketing  clinical study establishes that the drug does
not perform as expected, or if post-marketing restrictions are not adhered to or
are not  adequate  to  ensure  the  safe  use of the  drug,  or  other  evidence
demonstrates  that the product is not safe and/or effective under its conditions
of use, the FDA may withdraw approval.  The Subpart H Regulations can complement
the 1988 Regulations for expediting the development, evaluation and marketing of
drugs. These two procedures for expediting the clinical  evaluation and approval
of certain drugs may shorten the drug  development  process by as much as two to
three years.

    The  Company  believes  that  Thiovir  may be a  candidate  for  accelerated
development  and/or  approval  under the 1988  Regulations  and/or the Subpart H
Regulations. There can be no assurance, however, that Thiovir ultimately will be
eligible for development and/or approval under these  regulations.  In addition,
there can be no assurance that Thiovir will be approved by the FDA for marketing
at all or, if approved for marketing, will be approved for marketing sooner than
would be traditionally expected.

    Once the sale of a product is approved, the FDA regulates the manufacturing,
marketing and other  activities  under the Federal Food,  Drug, and Cosmetic Act
and the FDA's  implementing  regulations.  The FDA  periodically  inspects  both
domestic and foreign drug  manufacturing  facilities to ensure  compliance  with
applicable GMP regulations and other requirements. In addition, manufacturers in
the United  States must register with the FDA and submit a list of every drug in
commercial  distribution.  Foreign  manufacturers  are subject  only to the drug
listing  requirement.  The Company does not have or 



                                       30





currently intend to develop the facilities to manufacture  Thiovir in commercial
quantities, and intends to establish a relationship with a contract manufacturer
for the commercial  manufacture  of Thiovir.  There can be no assurance that the
Company's  contract  manufacturer will be able to attain or maintain  compliance
with GMP  regulations.  Post-marketing  reports are also required to monitor the
product's usage and effects. Product approvals may be withdrawn, or other action
as  may  be  ordered,   or  sanctions  imposed  if  compliance  with  regulatory
requirements is not maintained.

    The  Company  expects to seek  approval  for Thiovir by the  European  Union
contemporaneously  with seeking approval by the FDA. The processes and standards
of the  European  Union are  similar to those of the FDA and are  subject to the
same  uncertainties   regarding  the  time  of  completion  and  expenditure  of
resources.  The  Company  has no plans at this time to  undertake  the  approval
process  for  Thiovir in Japan or any other  foreign  country.  The  Company may
decide to market  Thiovir,  prior to  obtaining  any FDA  approval,  in  certain
foreign countries that do not require regulatory approval,  although the Company
does not now have any plans for doing so.

    In addition to the import requirements of foreign countries,  a company must
also comply  with  United  States  laws  governing  the export of FDA  regulated
products.  Pursuant to the FDA Export Reform and Enhancement Act of 1996, a drug
that has not  obtained  FDA approval may be exported to any country in the world
without FDA  authorization  if the product  both  complies  with the laws of the
importing  country and has obtained valid marketing  authorization in one of the
following countries: Australia, Canada, Israel, Japan, New Zealand, Switzerland,
South  Africa,  the European  Union,  or a country in the European  Union,  or a
country in the European Economic Area. The FDA is authorized to add countries to
this list in the future. Among other restrictions,  a drug that has not obtained
FDA  approval may be exported  under the new law only if it is not  adulterated,
accords to the specifications of the foreign  purchaser,  complies with the laws
of the importing country,  is labeled for export, is manufactured in substantial
compliance with GMP regulations and is not sold in the United States.

PATENTS

   
    Patent protection for Thiovir is an important part of the Company's business
strategy,  and the  Company's  success  depends,  in part, on the ability of the
Company and its  licensors  to obtain  patent  protection  for  Thiovir,  defend
patents  once  obtained,  use patents to  preclude  competitors  from  marketing
Thiovir or substantially  equivalent  drugs,  operate without  infringing on the
patents and proprietary rights of third parties and obtain appropriate  licenses
to patents or  proprietary  rights held by third parties if  infringement  would
otherwise occur.  The proprietary  rights licensed to the Company include a U.S.
patent relating to a method of synthesizing  Thiovir,  a U.S. patent for the use
of Thiovir for the treatment of HIV, a pending patent  application,  and certain
other patent rights.
    

    There can be no assurance that all or any of the Company's patent rights are
enforceable,  will  not  be  invalidated,  or  will  have  sufficient  scope  to
effectively  prevent others from marketing  Thiovir or substantially  equivalent
drugs.  Furthermore,  the commercial  marketing of therapeutic drugs is a highly
competitive  and  litigation-prone  field.  Even if the Company is successful in
establishing  and defending its patent  position,  the costs and management time
associated  with such  activities  may  significantly  and adversely  affect the
financial condition and business operations of the Company. See "RISK FACTORS --
Uncertainty of Patents; Dependence on Patents, Licenses and Proprietary Rights."

   
    Astra  Pharmaceutical  ("Astra") owns United States patents on foscarnet and
methods of its use to treat viral  infections,  which  patents are  scheduled to
expire  in or prior to  2000.  Thiovir  is at  least  partially  metabolized  to
foscarnet  in vitro  in  cells  and in dogs and  cats.  Therefore,  the  Company
believes  that  Thiovir  may  likewise  be  partially  converted  to the  active
ingredient in foscarnet in human patients.  It is unresolved  whether  metabolic
conversion of a drug into another  patented drug  constitutes  infringement of a
patent  protecting the second drug. Based upon review of the limited case law in
this area,  the Company  believes that its sale of Thiovir should not be held to
infringe  the Astra  patents  on  foscarnet  for two  reasons.  First,  the oral
delivery of Thiovir would constitute an improved  delivery system as compared to
the  intravenous  delivery of foscarnet in the  treatment of a  life-threatening
illness. 
    


                                       31






   
Second,  Thiovir is believed to be effective in treating HIV  independent of its
possible conversion into the active ingredients in foscarnet.  Moreover, even if
the Company's sale of Thiovir were held to constitute  infringement of the Astra
patents,  although  there can be no  assurance,  the Company  believes  that the
remedy for infringement  available to Astra would likely be limited to requiring
the  Company to pay Astra a  reasonable  royalty on sales of  Thiovir,  and that
Astra would not succeed in  enjoining  the Company from  selling  Thiovir.  This
royalty  would likely be payable only  through the  remaining  life of the Astra
patents.

    The  Company  is not  aware  of any  United  States  patent  which  would be
infringed by the  manufacture  of Thiovir  pursuant to the method of  synthesis.
There can be no assurance,  however, that the Company is aware of all patents or
patent  applications  that may materially  affect the Company's ability to make,
use or sell Thiovir.  United States patent  applications are confidential  while
pending in the PTO, and patent applications filed in foreign countries are often
first  published six months or more after filing.  Any conflicts  resulting from
third party  patent  applications  and patents  could  significantly  reduce the
coverage  of the  patents  licensed  to the Company and limit the ability of the
Company or its licensor to obtain meaningful patent  protection.  If patents are
issued to other companies that contain  competitive or conflicting  claims,  the
Company  may be required  to obtain  licenses to these  patents or to develop or
obtain alternative  technology.  There can be no assurance that the Company will
be able to  obtain  any such  license  on  acceptable  terms or at all.  If such
licenses are not  obtained,  the Company  could be delayed in or prevented  from
pursuing the  development or  commercialization  of Thiovir,  which would have a
material adverse effect on the Company.
    

RELATIONSHIP WITH USC

    The Company holds an exclusive  worldwide license from USC (the "USC License
Agreement") to practice the inventions  covered by specified  patents related to
TPFA in order  to  manufacture  and sell  products  for the  treatment  of viral
infections  ("Products").  The Company's  exclusive licensing rights are subject
to: (i) nonexclusive  rights that may be held by the United States government as
a result of any funding of research related to the inventions,  as prescribed by
federal  law;  and (ii) USC's  reserved  but  non-transferable  right to conduct
research relating to the Products.  In addition,  all sub-licenses granted under
the license  must be approved in advance and in writing by USC,  but the license
provides that such approval shall not be unreasonably withheld. The Company will
be  obligated to pay to USC  royalties  equal to 1% of any sales of the Products
and 50% of any royalties  earned by the Company from any  sublicensees.  Minimum
annual  royalties  are payable,  starting at $12,500 in 1998 and  increasing  to
$125,000 in 2001 and each year thereafter.

    USC is  obligated  under the USC License  Agreement to file,  prosecute  and
maintain certain United States patents and, if required by the Company, to file,
prosecute and maintain  foreign  patents.  The Company is obligated to reimburse
USC for the legal expense of patent prosecution,  plus a 15% administrative fee.
USC has no  obligation  to defend any of the  patents  while the Company has the
right to do so at its own expense  (with  certain  rights to offset a portion of
royalties  otherwise owing to USC). The Company has a first right to bring legal
action to enforce  the  patents,  and USC may bring such  action if the  Company
elects not to exercise its right. The USC License  Agreement also extends to the
Company  a  right-of-first-refusal  to  obtain an  option  and  license  for any
substantial  improvements to the subject technology  developed by Dr. McKenna on
the same terms and conditions as the USC License Agreement.

    In January 1997, the Company entered into a new research  agreement with USC
providing  for the grant by the Company of $176,000 to fund further  research on
Thiovir  through  September 30, 1997. See "BUSINESS -- Research and  Development
Status and Activities."

OTHER PRODUCTS

    The Company has no current plans or strategies  for  developing or acquiring
products  other than  Thiovir.  The Company  intends,  however,  to  investigate
potential  therapeutic  applications  of  Thiovir  other than the  treatment  of
HIV/AIDS and CMV,  some of which have been  suggested by in vitro  studies.  The
Company may explore  possibilities of developing or acquiring  medical products,
the 



                                       32






   
development and/or marketing of which would be compatible with the activities of
the Company with respect to Thiovir.  There can be no assurance that the Company
will be successful in such endeavors.
    

HEALTH CARE REFORM MEASURES AND THIRD PARTY REIMBURSEMENT

    The  business  and  financial  condition of  pharmaceutical  companies  will
continue to be affected by the efforts of governments  and third party payors to
contain or reduce the cost of health care  through  various  means.  A number of
legislative  and regulatory  proposals  aimed at changing the health care system
have been  proposed in recent  years.  In addition,  an  increasing  emphasis on
managed care in the United States has and will continue to increase the pressure
on pharmaceutical  pricing. While the Company cannot predict whether legislative
or regulatory  proposals will be adopted or the effect such proposals or managed
care efforts may have on its business,  the announcement and/or adoption of such
proposals or efforts could have a material adverse effect on the Company. In the
United States and elsewhere, sales of prescription pharmaceuticals are dependent
in part on the  availability of  reimbursement  to the consumer from third party
payors,   such  as  government   and  private   insurance   plans  that  mandate
predetermined  discounts from list prices.  Third party payors are  increasingly
challenging the prices charged for medical products and services. If the Company
succeeds in bringing  Thiovir to the market,  there can be no assurance  that it
will be considered cost effective or that  reimbursement to the consumer will be
available  or will be  sufficient  to allow the  Company  to sell  Thiovir  on a
competitive  and  profitable  basis.  See "RISK FACTORS -- Uncertainty of Health
Care Reform Measures and Third Party Reimbursement."

PERSONNEL

    The Company currently has two employees. The Company intends to utilize from
time to time the services of consultants and independent  contractors to provide
key functions that might  otherwise be provided by  Company-employed  personnel.
The  Company's  future  success  will  depend in large part upon its  ability to
attract and retain  highly  qualified  employees,  consultants  and  independent
contractors. See "RISK FACTORS -- Dependence on and Need to Hire Personnel."

LEGAL PROCEEDINGS

    The Company is not involved in any litigation.



                                       33






                                   MANAGEMENT

EXECUTIVE OFFICERS, DIRECTORS AND KEY CONSULTANTS

    The executive  officers,  directors and key  consultants  of the Company and
their ages, as of April 1, 1997, are as follows:


<TABLE>
<CAPTION>
                    NAME                       AGE                  POSITION
                    ----                       ---                  --------
<S>                                          <C>   <C>
   
Francis E. O'Donnell, Jr., M.D.                47    Chairman of the Board, Chief Executive
                                                      Officer, Director and Founder
Nicholas Jon Virca                             50    President and Chief Operating Officer
Samuel P. Sears, Jr.                           53    Treasurer, Secretary and Director
Mary Anthony Gray                              49    Executive Vice-President
Emanuela I. Charlton, Ph.D.(1)(2)              63    Director and Consultant
Thomas Quinn(1)(2)                             47    Director
W. Howard Lewin, M.D. (1)(2)                   76    Director
Charles E. McKenna, Ph.D.                      52    Consultant
Thomas D. Wolfe                                48    Consultant
    

- ----------
(1) Member of the Compensation Committee
(2) Member of the Audit Committee
</TABLE>
   
    Each of the executive  officers (other than Mr. Virca) and directors  (other
than Dr. Lewin) assumed their  responsibilities  with the Company in 1996 at the
time of the Company's acquisition of a license of certain rights to Thiovir. Mr.
Virca became the Company's  President and Chief Operating Officer in March 1997.
Dr. Lewin became a director in December 1996.

    The Company's Certificate of Incorporation currently provides that the Board
shall be classified as nearly as possible into three classes,  each  containing,
as nearly as  possible,  one-third  of the  members  of the Board.  Emanuela  I.
Charlton and Thomas Quinn are  classified  as Class I directors  and shall serve
until the annual meeting of the Company's stockholders (the "Annual Meeting") to
be held in 1997; W. Howard Lewin,  M.D. and Samuel P. Sears,  Jr. are classified
as Class II directors and shall serve until the 1998 Annual Meeting; and Francis
E.  O'Donnell,  Jr.,  M.D. is classified as a Class III director and shall serve
until the 1999 Annual  Meeting.  Each successor to a director whose term expires
at an Annual Meeting will be elected to serve until the third succeeding  Annual
Meeting  after his or her election and until his or her  successor has been duly
elected and qualified.  Any director chosen to fill a vacancy on the Board shall
hold office until the next  election of the class for which he or she shall have
been chosen,  and until his or her successor is duly elected and qualified.  The
Company   anticipates   amending  its  Certificate  of  Incorporation  prior  to
completion of the Offering to eliminate the  classification  of the Board and to
provide that each director  elected by the holders of the Company's Common Stock
shall  serve until the next Annual  Meeting and until his or her  successor  has
been duly  elected or  appointed  to the Board by the Board and  qualified.  The
Company  plans to hold the 1997 Annual  Meeting  prior to the  completion of the
Offering.  As a  result,  at the time of the  completion  of the  Offering,  all
directors  will have been  elected to serve  until the 1998  Annual  Meeting and
until  their  respective  successors  have  been  elected  and  qualified.   See
"DESCRIPTION   OF  SECURITIES  --  Delaware  Law  and  Certain   Certificate  of
Incorporation and Bylaw  Provisions."  Officers are elected by, and serve at the
discretion  of,  the Board.  No  director,  executive  officer,  or  significant
employee or  consultant  is related by blood,  marriage or adoption to any other
director, executive officer, or significant employee or consultant.
    

    The  following  is a brief  summary  of the  background  of  each  director,
executive officer and key consultant of the Company:

   
    FRANCIS E.  O'DONNELL,  JR., M.D.,  Chairman of the Board,  Chief  Executive
Officer,  Director and Founder.  Since 1994, Dr.  O'Donnell has been the Medical
Director of the O'Donnell Eye Institute and
    



                                       34





a Clinical Professor,  Department of Ophthalmology,  at the St. Louis University
School of  Medicine.  Dr.  O'Donnell  also  serves as  Chairman  of the Board of
LaserSight, Inc., a publicly traded corporation which manufactures medical laser
equipment  and  provides  managed  medical  care  services.  Dr.  O'Donnell is a
graduate of St. Louis University and Johns Hopkins University School of Medicine
and is a practicing ophthalmologist.

   
    NICHOLAS JON VIRCA,  President and Chief Operating Officer.  Mr. Virca began
his employment  with the Company in March 1997.  From 1991 to 1997, he served as
Vice  President  of  Operations  and  Co-Founder  of Diametrix  Detectors,  Inc.
("Diametrix"),  a privately held  immunosensor  company  focused on the airborne
vapor  detection of narcotics.  From 1991 to 1994, Mr. Virca also served as Vice
President,  Business  Operations of IRT Corporation  ("IRT"),  a publicly traded
company that  specialized in x-ray inspection and imaging systems for industrial
and security applications.  From 1994 to 1997, Mr. Virca served as Business Unit
Manager, Security Products for Nicolet Imaging Systems, a company that purchased
substantially  all of IRT's assets in 1994. Mr. Virca received a B.A.  degree in
biology  from  Youngstown  State  University.  Mr. Virca  currently  serves as a
director of Diametrix.  Mr. Virca's prior experience  includes key marketing and
general  management  positions with Fisher  Scientific,  Damon Biotech,  Promega
Corp.,  the Ortho  Division of Johnson & Johnson and the Ross Division of Abbott
Laboratories.
    

    SAMUEL P. SEARS,  JR.,  Treasurer,  Secretary and Director.  Since 1994, Mr.
Sears has been  employed as the Chief  Executive  Officer and a director of Star
Tobacco Corporation,  a privately-owned  manufacturer of tobacco products.  From
1993 to 1994,  he served as "of  Counsel"  to the New York law firm of  LeBoeuf,
Lamb, Greene & MacRae.  Prior to 1993, Mr. Sears was the Managing Partner of the
Boston law firm of Burns & Levinson for over twelve years. He is also a director
of  Eye  Technology,  Inc.,  a  publicly-owned  corporation  which  manufactures
intraocular lenses used in cataract surgery.  Mr. Sears is a graduate of Harvard
College and Boston College Law School.

   
    MARY ANTHONY GRAY, Executive Vice President. Since 1991, Ms. Gray has served
as a  biomedical  technology  transfer  advisor to the  University  of  Southern
California.   Since  1986,  she  has  also  been  a  partner  of   BioStrategies
International,  a  technology  consulting  firm.  Ms.  Gray's  prior  experience
includes business  development and sales positions with the following companies:
Damon Biotech,  Inc.,  Ortho  Diagnostics  Division of Johnson & Johnson and the
J.T. Baker Instruments Division of Richardson-Merrill Pharmaceuticals.  Ms. Gray
holds B.S. and M.S. degrees from the University of Missouri.
    

    EMANUELA I.  CHARLTON,  PH.D.,  Director  and  Consultant.  Since 1994,  Dr.
Charlton  has  served  as the  Director  of  Regulatory  Affairs  of  LaserSight
Technologies,  Inc.,  a  manufacturer  of  excimer  and solid  state  lasers for
ophthalmic  purposes.  In  addition,  since 1991,  Dr.  Charlton has served as a
director of its parent company, LaserSight, Inc., a publicly traded corporation.
Since 1985, she has been the President of North American Health Resources, Inc.,
a medical  affairs  consulting  firm which she  founded.  Dr.  Charlton has held
positions,  primarily  in the fields of medical  regulatory  affairs and medical
research,  with the following  companies:  High Stoy Technological  Corporation,
Baxter-Travenol,  Inc.,  Searle  Laboratories,  Abbott  Laboratories  and Pfizer
Laboratories.  She holds B.A. and M.S.  degrees from New York  University  and a
Ph.D. degree from The Union Institute Graduate School.

    THOMAS QUINN,  Director.  Since 1995, Mr. Quinn has served as Vice President
of Development of Olsten  Kimberly  Quality Care, a managed health care company.
From 1992 to 1995,  Mr.  Quinn  was Vice  President,  Marketing  and  Sales,  of
Integrated  Health Services,  Inc., a managed health care company.  From 1989 to
1992,  he served as  President  of Infu Tech,  Inc.,  a national  home  infusion
therapy company. Mr. Quinn currently serves as a director of LaserSight, Inc., a
publicly-owned corporation. Mr. Quinn holds a B.S. degree from the University of
Pittsburgh.

    W.  HOWARD  LEWIN,  M.D.,  Director.  Since  1960,  Dr.  Lewin  has been the
President and Medical Director of Lewin & Milster Ophthalmology, Inc., a private
medical  practice.  In addition,  since 1975,  Dr. Lewin has been  employed as a
Clinical  Professor  of  Ophthalmology  at the St.  Louis  University  School of
Medicine.  Dr.  Lewin  received a B.A.  degree from  Central  College,  Fayette,
Missouri and an M.D. degree from the St. Louis University School of Medicine.



                                       35






    CHARLES E. MCKENNA,  PH.D.,  Consultant.  Since 1989, Dr. McKenna has been a
Professor of Chemistry at USC. Dr. McKenna is the inventor of the two patents of
which the Company is the exclusive licensee, and he has directed the research of
TPFA conducted at USC pursuant to research grants formerly  provided by PerArdua
Investors,  L.P., the partnership  from which the Company  obtained the licenses
related to Thiovir.  Dr.  McKenna will serve as  consultant to the Company for a
period of time ending  three years after the date of the  Offering or until June
30, 2000,  whichever  first  occurs.  Dr.  McKenna  received a B.A.  degree from
Oakland University and a Ph.D. in Chemistry from the University of California at
San Diego.

    THOMAS  D.  WOLFE,  Consultant.  Since  1993,  Mr.  Wolfe has been the Chief
Executive  Officer  of  Palmyra  Group,   Inc.,  a  company  providing  chemical
engineering process consulting services and related software services. From 1991
to  1993,  he was a  managing  director  of HPD,  Incorporated,  a  retailer  of
evaporization and crystallization  systems.  Mr. Wolfe was a founder of PerArdua
Investors,  L.P.  The Company  expects to engage the  services of Mr. Wolfe from
time to time to consult on manufacturing, marketing and other matters. Mr. Wolfe
received a B.A.  degree in Chemistry  from the  University  of California at San
Diego.
   
    Dr.  O'Donnell  and Mr.  Sears expect to devote  approximately  25% of their
business  time to the  affairs  of the  Company.  Ms.  Gray  expects  to  devote
approximately 80% of her business time to the affairs of the Company.  Mr. Virca
will be a full-time employee of the Company.
    

COMMITTEES OF THE BOARD OF DIRECTORS

    The Board has established an Audit  Committee and a Compensation  Committee,
each composed of at least two independent  directors.  Currently,  the Company's
three outside  directors,  Mr. Quinn, Dr. Lewin and Dr. Charlton,  serve on both
committees.  The Audit  Committee  will  recommend  the  annual  appointment  of
auditors,  with  whom the Audit  Committee  will  review  the scope of audit and
non-audit  assignments  and  related  fees,  accounting  principles  used by the
Company in financial reporting, internal auditing procedures and the adequacy of
the internal control procedures of the Company. The Compensation  Committee will
establish  salaries,  bonuses and other compensation for the Company's executive
officers and administer the Company's  Incentive Plan and other employee benefit
plans.

EXECUTIVE COMPENSATION AND OTHER INFORMATION

    Summary of Cash and Certain Other Compensation.  No executive officer of the
Company earned or received in excess of $100,000 for any fiscal year ended on or
prior to November 30, 1996. Dr. O'Donnell has not received any compensation from
the Company in any fiscal year.  As a group,  the Company's  executive  officers
(three individuals, only one of whom received or earned any compensation) earned
and received  $11,230  during the fiscal year ended  November  30, 1996,  and no
compensation during any prior period.

    Stock  Option  Grants.  On August 20,  1996 the  Company  issued  options to
purchase  10,000  shares of the  Company's  Common  Stock to Mary  Anthony  Gray
pursuant to the Incentive  Plan.  The options  granted have an exercise price of
$7.50 per share.  The options  granted to Ms. Gray vest on September 3, 1997 and
expire on  September 2, 2001.  The options were the only options  granted by the
Company in the 1996 fiscal year.

   
    Director Compensation. The Company's directors have not been compensated for
the services they provide to the Company.  Upon the  completion of the Offering,
the Company  plans to issue  options to acquire  10,000  shares of Common  Stock
pursuant to the Incentive Plan to each of Dr. Charlton,  Dr. Lewin and Mr. Quinn
at an exercise  price to be determined,  but not less than $5.00 per share.  The
Company's  directors  receive  reimbursement  for  any  out-of-pocket   expenses
incurred in attending meetings of the Company's Board.

    EMPLOYMENT  CONTRACTS AND  TERMINATION OF EMPLOYMENT  AND  CHANGE-IN-CONTROL
ARRANGEMENTS.  On February 12,  1997,  the Company  entered  into an  employment
agreement  with Nicholas Jon Virca pursuant to which Mr. Virca will serve as the
Company's  President  and  Chief  Operating  Officer.   Mr.  Virca's  employment
agreement expires on February 29, 2000, unless earlier  terminated in accordance
with the terms  thereof.  Mr.  Virca will  receive a salary equal to $10,000 per
month. In addition,  upon the completion of the
    


                                       36





   
Offering, the Company will grant to Mr. Virca options to purchase 100,000 shares
of the Company's  Common Stock pursuant to the Incentive  Plan. The options will
vest over a two year  period and will have an exercise  price to be  determined,
but in no case  less than  $5.00 per  share.  Upon a change  in  control  of the
Company (as defined in the  agreement),  the employment  agreement  provides Mr.
Virca the right to receive a lump sum  severance  payment  upon  termination  of
employment equal to (i) the lesser of six month's salary or the amount of salary
then  remaining  payable for the duration of the  agreement's  term plus (ii) an
amount  equal to the most  recent  monthly  payment  made by the Company for Mr.
Virca's health and life insurance  (including family coverage) multiplied by the
lesser of six or the number of months remaining in the term of the agreement.

    The Company has entered  into an  employment  agreement  with Ms. Gray which
provides for monthly  compensation  of $7,000.  This agreement will terminate on
February 29, 2000,  unless either party  terminates such agreement in accordance
with the terms thereof.  In addition,  upon the completion of the Offering,  the
Company  will  grant to Ms.  Gray  options  to  purchase  100,000  shares of the
Company's  Common Stock  pursuant to the Incentive  Plan.  The options will vest
over a three year period and will have an exercise price to be  determined,  but
in no case less than $5.00 per share.

    As of the date hereof, the Company has not entered into any other employment
contracts or any compensatory plans or arrangements relating to the resignation,
retirement  or other  termination  of any of the Company's  executive  officers.
Similarly,  as of the date of this Prospectus,  the Company has not entered into
any other  plan or  agreement  pursuant  to which an  executive  officer  of the
Company  will  receive  any funds upon a  change in control  of the Company or a
change in his or her responsibilities following a change-in-control.

    The  Company  has  entered  into  a  consulting   agreement   (the  "McKenna
Agreement")  with Charles E. McKenna,  Ph.D. which continues until September 30,
1999. The McKenna  Agreement  provides that Dr.  McKenna,  who is a Professor of
Chemistry at USC and who is the inventor of the two issued  patents to which the
Company holds an exclusive license from USC, will provide consulting services to
the Company  upon  matters  which  relate to the field of  chemistry  and to the
development  of  Thiovir,  subject to his  obligations  to USC.  The  Company is
obligated to pay Dr. McKenna a retainer of $5,000 for the period October 1, 1996
through  March 31, 1997,  $5,000 for the period April 1, 1997 through  September
30, 1997,  $12,500 for the period October 1, 1997 through September 30, 1998 and
$15,000 for the period October 1, 1998 through  September 30, 1999. In addition,
the Company will pay a fee to Dr.  McKenna for actual  services  rendered at the
rate  of  $1,000  per day or $600  per  half  day  and  will  reimburse  him for
out-of-pocket  expenditures  incurred in the  performance of his services to the
Company.  The  McKenna  Agreement  contains  (i) certain  restrictive  covenants
limiting Dr.  McKenna's right to engage in the development or  commercialization
of drugs that might compete with Thiovir, (ii) confidentiality  provisions,  and
(iii)  provisions   relating  to  the  assignment  to  the  Company  of  certain
inventions,  improvements and  modifications  made by him during the term of the
McKenna  Agreement.  The rights and  obligations  of the Company and Dr. McKenna
under the McKenna  Agreement are subject to Dr.  McKenna's  obligations  to USC,
which include  assignment of all rights to intellectual  property he develops in
his area of  expertise  and  restrictions  on the  amount of time he  devotes to
consulting  activities.  Dr. McKenna is also the principal  investigator  in the
ongoing  research   concerning  Thiovir  being  conducted  under  the  Company's
sponsored  research  agreement with USC. See "BUSINESS -- Relationship with USC"
and "CERTAIN TRANSACTIONS."
    

INCENTIVE PLAN

    On July 5, 1996,  the Board  adopted  and the  stockholders  of the  Company
approved the  Company's  Incentive  Plan.  The  Incentive  Plan provides for the
granting   to   employees,   officers,   directors,   consultants   and  certain
non-employees  of the Company of (i) options to purchase  shares of Common Stock
and (ii) stock  appreciation  rights  ("SARs").  The maximum number of shares of
Common Stock that may be issued pursuant to options and SARs under the Incentive
Plan is 500,000,  subject to  adjustment  in the event of a stock  split,  stock
dividend or other  change in the Common  Stock or the capital  structure  of the
Company.  The Incentive Plan will be administered by the Compensation  Committee
of the Board of Directors.  Subject to the provisions of the Incentive Plan, the
Compensation  Committee  will be authorized to determine who may  participate in
the  Incentive  Plan,  the  number and type of awards to each  participant,  the
schedule on which each award will become  exercisable and the terms,  conditions
and limitations  applicable to each award. The Compensation  Committee will have
the exclusive  power to interpret the Incentive Plan and to adopt such 



                                       37






rules and  regulations as it may deem  necessary or appropriate  for purposes of
administering the plan. Subject to certain  limitations,  the Board of Directors
will be authorized to amend,  modify or terminate the Incentive Plan to meet any
changes in legal requirements or for any other purpose permitted by law.

    Options.  Options granted under the Incentive Plan may be either  "incentive
stock options" within the meaning of Section 422 of the Internal Revenue Code of
1986,  as amended,  or  non-qualified  options.  Incentive  stock options may be
granted  only  to  employees  of  the  Company  (including   directors  who  are
employees),   while  non-qualified   options  may  be  granted  to  non-employee
directors,  employees,  consultants,  advisors and other independent contractors
providing  services to the Company.  The per share  exercise price of the Common
Stock subject to an option granted  pursuant to the Incentive Plan is determined
by the Compensation  Committee at the time the option is granted. In the case of
incentive  stock  options,  the exercise price must not be less than 100% of the
fair market value of the shares covered  thereby at the time the incentive stock
option is granted  (but in no event less than par value).  "Fair  market  value"
shall be determined by the Board, or by its designated committee,  in good faith
and using any reasonable method. No person who owns, directly or indirectly,  at
the time of the granting of an incentive stock option to him, 10% or more of the
total   combined   voting   power  of  all  classes  of  Common  Stock  (a  "10%
Stockholder"),  shall be eligible to receive an incentive stock option under the
Incentive Plan unless the option price is at least 110% of the fair market value
of the Common  Stock  subject to the  option,  determined  on the date of grant.
Non-qualified options are not subject to this limitation.

    No incentive  stock option may be  transferred  by an optionee other than by
will or the laws of descent  and  distribution,  and during the  lifetime  of an
optionee,  the option will be exercisable only by the optionee.  In the event of
termination of employment,  other than by death or permanent,  total disability,
the  optionee  will have three  months  after such  termination  to exercise the
option to the extent it was  exercisable on the date of such  termination.  Upon
termination  of  employment  of an  optionee  by  reason  of death or  permanent
disability,  an option remains exercisable for one year thereafter to the extent
it was  exercisable  on the  date of such  termination.  No  similar  limitation
applies to non-qualified options.

    Incentive stock options granted under the Incentive Plan cannot be exercised
more than 10 years from the date of grant,  except that incentive  stock options
issued to a 10% Stockholder are limited to five year terms.  All options granted
under the  Incentive  Plan may provide for the payment of the exercise  price in
cash,  by cash  equivalent  acceptable  to the  Company,  or by  delivery to the
Company of shares of Common Stock  already  owned by the optionee  having a fair
market value equal to the exercise price of the options being exercised, or by a
combination of such methods of payment.  Therefore, a participant may be able to
tender shares of Common Stock to purchase  additional shares of Common Stock and
may, theoretically,  exercise all of his or her stock options with no additional
investment other than his or her original shares.  Any unexercised  options that
expire or terminate become available once again for issuance.

    Stock  Appreciation  Rights.  Under the  Incentive  Plan,  the  Compensation
Committee  also may grant SARs  either in tandem  with an option or alone.  SARs
granted  in tandem  with a stock  option  may be granted at the same time as the
stock option or at a later time. A SAR entitles the  participant to receive from
the  Company  an amount  payable  in cash,  in  shares  of Common  Stock or in a
combination  of cash and Common Stock equal to the positive  difference  between
the fair market value of a share of Common Stock on the date of exercise and the
grant price.

    Tax  Consequences.  No income is recognized by a participant  at the time an
option is granted. If the option is an incentive stock option, no income will be
recognized upon the participant's  exercise of the option.  Income is recognized
by a participant  when he or she disposes of shares  acquired under an incentive
stock option. The exercise of a nonqualified stock option generally is a taxable
event that  requires the  participant  to  recognize,  as ordinary  income,  the
difference between the shares' fair market value and the option price. No income
is  recognized  upon the grant of an SAR. The exercise of an SAR  generally is a
taxable event. The participant generally must recognize income equal to any cash
that is paid and the fair  market  value of Common  Stock  that is  received  in
settlement of an SAR. The Company will be entitled to claim a federal income tax
deduction on account of the exercise of a nonqualified option or SAR. The amount
of the deduction is equal to the ordinary income  recognized by the participant.
The Company will not be entitled to a federal income tax deduction on account of
the grant 



                                       38





or the exercise of an incentive  stock  option.  The Company may claim a federal
income tax deduction on account of certain dispositions of stock issued upon the
exercise of an incentive stock option.

   
    Change  in  Control  Provisions.  In the  event  of a  "change  in  control"
transaction,  the Company's  Compensation  Committee may take any one or more of
the following  actions  either at the time an option or SAR is granted or at any
time  thereafter:  (i) provide for the acceleration of any time periods relating
to the exercise of any option or SAR so that such option or SAR may be exercised
in full on or before a date initially fixed by the Compensation Committee;  (ii)
provide for the purchase or  settlement  of any option or SAR by the Company for
an amount of cash equal to the amount  which could have been  obtained  upon the
exercise of such option or SAR or realization of such  participant's  rights had
such  option or SAR been  currently  exercisable  or  payable;  (iii)  make such
adjustment to any option or SAR then outstanding as the  Compensation  Committee
deems appropriate to reflect such "change in control" transaction; or (iv) cause
any option or SAR then  outstanding  to be  assumed,  or new rights  substituted
therefor,  by the acquiring or surviving corporation in such "change in control"
transaction.   In  relation  to  the  Incentive  Plan,  a  "change  in  control"
transaction  is  defined to  constitute  any of the  following:  (i) a merger or
consolidation in which holders of outstanding  voting stock of the Company would
receive  less  than  50% of the  voting  stock  of the  surviving  or  resulting
corporation;  (ii) adoption by the Company of a plan of  liquidation or approval
of the dissolution of the Company;  (iii) the sale or transfer of  substantially
all of the assets of the Company;  or (iv) a tender offer or exchange  offer for
shares of Common  Stock of the  Company  other  than any such  offer made by the
Company or any corporation affiliated with the Company.
    

LIMITATION ON OFFICERS' AND DIRECTORS' LIABILITIES

   
    Pursuant to the  Company's  Certificate  of  Incorporation  and the Delaware
General  Corporation Law, directors of the Company are not liable to the Company
or its stockholders  for monetary  damages for breach of fiduciary duty,  except
for  liability in connection  with a breach of the duty of loyalty,  for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, for dividend  payments or stock  repurchases or redemptions in
violation  of  Delaware  law,  or for any  transaction  in which a director  has
derived an improper personal benefit.

    The Company's Certificate of Incorporation  includes provisions to indemnify
its officers and directors and other persons against expenses,  judgments, fines
and  amounts  paid in  settlement  in  connection  with  threatened,  pending or
completed  suits or  proceedings  against  such  persons by reason of serving or
having served as officers, directors or in other capacities,  except in relation
to matters with respect to which such persons  shall be  determined  not to have
acted in good faith, lawfully or in the best interests of the Company. Except in
the event  indemnification  is ordered by a court, the Company's  Certificate of
Incorporation  provides for indemnification  only to the extent that the Company
determines  that such person  acted in good faith and in a manner not opposed to
the best interests of the Company. Upon completion of the Offering,  the Company
also intends to enter into  indemnification  agreements with its directors which
will  require  the Company to provide  certain  additional  indemnification  and
contribution to its directors, subject to certain limitations.
    

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

    Currently, there is no pending litigation or proceeding involving a director
or officer of the Company as to which  indemnification  is being sought,  nor is
the Company  aware of any  threatened  litigation  that may result in claims for
indemnification by any officer or director.



                                       39



                             PRINCIPAL STOCKHOLDERS

   
    The following table sets forth certain information  regarding the beneficial
ownership of the Common Stock as of the date of this  Prospectus and as adjusted
to reflect the sale of the Common Stock offered hereby of (i) each person who is
known by the  Company to own of record or  beneficially  more than five  percent
(5%) of the  Common  Stock,  (ii) each  director  and  executive  officer of the
Company  and (iii) all  directors  and  executive  officers  of the Company as a
group. Unless otherwise indicated,  each of the persons or entities listed below
has  sole  voting  and  investment  power  with  respect  to  all  shares  shown
beneficially  owned by them,  except  to the  extent  such  power is shared by a
spouse under applicable law.

<TABLE>
<CAPTION>
                                                                                     PERCENT OF SHARES
                                                                                        OUTSTANDING
                                                                     NUMBER OF     BEFORE         AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER                                 SHARES(1)   OFFERING(1)   OFFERING(1)
- ------------------------------------                                 ---------   -----------   -----------
<S>                                                                  <C>         <C>           <C>
Francis E. O'Donnell, Jr., M.D.(2)(3)(4)                              280,000       10.6%           7.7%
Nicholas Jon Virca(2)                                                       0        *              *
Samuel P. Sears, Jr.(2)(4)                                             50,000        1.9            1.4
Thomas L. DePetrillo(4)(5)                                            368,750       13.9           10.1
Mary Anthony Gray(2)                                                  110,000        4.2            3.0
Charles E. McKenna, Ph.D.(6)                                          320,000       12.1            8.8
Thomas D. Wolfe(7)                                                    328,930       12.4            9.0
W. Howard Lewin M.D.(4)(8)                                              5,000        *              *
Thomas Quinn(4)(9)                                                      5,000        *              *
Emanuela I. Charlton, Ph.D.(4)(10)                                      5,000        *              *
The Starwood Trust(4)(11)                                             275,000       10.4            7.5
Yuan Lin(12)                                                          200,000        7.6            5.5
All Directors and Officers as a Group (7 persons)                     455,000       17.2           12.5

</TABLE>

- ----------
 *  Less than 1%.

(1) Pursuant to the SEC rules,  shares of Common  Stock which an  individual  or
    group has the right to acquire  within 60 days  pursuant to the  exercise of
    warrants  or  options  are  deemed  to be  outstanding  for the  purpose  of
    computing the percentage  ownership of such individual or group, but are not
    deemed  to be  outstanding  for the  purpose  of  computing  the  percentage
    ownership of any other person in the table.

(2) The beneficial owner's address is c/o PerArdua  Corporation,  10940 Wilshire
    Boulevard, Suite 1600, Los Angeles, California 90024.

(3) Of such shares,  205,000 shares are held by Kathleen O'Donnell as trustee of
    the Irrevocable Trust #4 f/b/o Francis E. O'Donnell, Jr. In addition, 75,000
    shares are held by Kathleen O'Donnell as trustee of the Francis E. O'Donnell
    Descendants  Trust. Dr.  O'Donnell  disclaims  beneficial  ownership of such
    shares.

(4) All of such shares were  originally  issued to the  beneficial  owner or the
    person  from  whom  the  beneficial  owner  acquired  such  shares  when the
    Company's Missouri predecessor corporation was formed in 1988 under the name
    Home Test,  Inc.("HTI").  These shares now reflect  ownership in the current
    Delaware corporation into which the Missouri corporation was merged.
    


                                       40









   
(5) Includes 50,000 shares of Common Stock held by Mr. DePetrillo's  spouse. Mr.
    DePetrillo disclaims beneficial ownership of such shares. Mr. DePetrillo was
    a founder of HTI. Mr.  DePetrillo  advised the Company in its acquisition of
    rights to the drug  Thiovir,  but is no longer active in the business of the
    Company. Mr. DePetrillo' address is 65 Peaked Rock Road, Narragansett, Rhode
    Island 02882.

(6) Dr. McKenna's address is 16625 Pequeno Place, Pacific Palisades,  California
    90272.

(7) Mr. Wolfe's address is 16288 Gleko Road, Rough and Ready, California 95975.

(8) Dr. Lewin's address is #8 Ridgecreek, St. Louis, Missouri 63141.

(9) Mr. Quinn's address is Nine Corland Trails, Mahwah, New Jersey 07430.

(10) Dr. Charlton's address is 619 Long Lake Drive, Oviedo, Florida 32765.

(11)The Starwood Trust is an  irrevocable  trust for the benefit of the children
    of a founder of HTI, who is not active in the  business of the Company.  The
    Starwood Trust's address is 120 Bayview Lane Osprey, Florida 34229.

(12) Ms. Lin's address is 730 Willow Run Lane, Winter Springs, Florida 32708.



    The  table  above  does  not  contain  Outstanding  Warrants  issued  to the
individuals  referenced  therein,  which will become  excercisable at a price of
$10.00 per share when the Company receives FDA approval for the sale of Thiovir.
In the event the fair market  value of the Common  Stock  exceeds  the  exercise
price of an Outstanding Warrant at the time of exercise, the holder may elect to
pay the exercise  price by  surrendering a portion of the shares of Common Stock
for which the Outstanding Warrant is excercisable  determined in accordance with
a formula  in lieu of  paying  the  exercise  price in cash.  These  Outstanding
Warrants have been issued as follows:
<TABLE>
<CAPTION>


                       NAME                         NUMBER OF OUTSTANDING WARRANTS
                       ----                         ------------------------------
<S>                                                            <C>
Francis E. O'Donnell, Jr., M.D. ..........................      150,000
Thomas L. DePetrillo .....................................      200,000
Thomas D. Wolfe ..........................................        8,930
The Starwood Trust .......................................      150,000
</TABLE>


                                       41


                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    In August 1996, the Company issued to three of the then  stockholders of the
Company warrants to purchase an aggregate of 500,000 shares of Common Stock. The
recipients  of these  warrants,  each of whom  paid no  consideration  for their
issuance,  were Francis E.  O'Donnell,  Jr., M.D., who is Chairman of the Board,
Chief  Executive  officer,  Director  and  Founder of the Company  (warrants  to
purchase  150,000 shares of Common Stock);  The Starwood  Trust,  an irrevocable
trust for the  benefit of a founder of HTI who is not active in the  balances of
the Company (warrants to purchase 150,000 shares of Common Stock); and Thomas L.
DePetrillo,  who was a founder of HTI and advised the Company in its acquisition
of rights to the drug  Thiovir,  but is no longer  active in the business of the
Company. (warrants to purchase 200,000 shares of Common Stock). See "MANAGEMENT"
and "PRINCIPAL STOCKHOLDERS."

    Pursuant to an Option and Asset Purchase Agreement,  dated July 8, 1996 (the
"Acquisition  Agreement"),  the  Company  acquired  certain  rights of  PerArdua
Investors,  L.P., a California limited partnership (the "Limited  Partnership").
Prior to such  acquisition,  the Limited  Partnership was unaffiliated  with the
Company and had been formed and operated for the purpose of conducting  research
and  development  on Thiovir,  primarily  through  research  grants to USC.  The
Company  acquired  an  assignment  of  the  Limited   Partnership's  rights  and
obligations  under an Option and  License  Agreement  by and between the Limited
Partnership  and USC. See "BUSINESS --  Relationship  with USC." The Acquisition
Agreement granted to the Company, in consideration of $100,000, an option, which
was  exercised,  to acquire  the  rights for  $350,000  plus  reimbursement  for
specified  liabilities  which totaled  $90,000,  for a total  purchase  price of
$440,000.  Simultaneously  with the  closing  of the  acquisition  of the rights
pursuant to the Acquisition Agreement,  the Company entered into a Stockholders'
Agreement (the "Stockholders' Agreement") with all of its then stockholders, the
limited  partners of the Limited  Partnership  (the  "Limited  Partners"),  USC,
Charles E. McKenna, Ph.D., Mary Anthony Gray, and Thomas D. Wolfe, the latter of
whom was also a Limited Partner. See "MANAGEMENT" and "PRINCIPAL  STOCKHOLDERS."
Under  the terms of the  Stockholders'  Agreement,  the  Limited  Partners  were
granted  the right to  acquire  a total of  192,000  shares of Common  Stock and
192,000 Outstanding Warrants for total consideration of $192.00; USC was granted
the right to acquire 8,000 shares of Common Stock and 8,000 Outstanding Warrants
for total  consideration of $8.00; and Dr. McKenna,  Ms. Gray and Mr. Wolfe were
granted  the right to acquire  320,000,  110,000  and  320,000  shares of Common
Stock,  respectively,  for total consideration of $320.00, $110.00, and $320.00,
respectively.  All such rights to acquire shares of Common Stock and Outstanding
Warrants  were  exercised.  All  persons  to whom  shares  of  Common  Stock and
Outstanding  Warrants  were issued upon the exercise of such rights are entitled
to certain  registration  rights  with  respect to the Common  Stock  issued and
issuable  upon  exercise  of  the  Outstanding  Warrants.  See  "DESCRIPTION  OF
SECURITIES" -- Common Stock." Mr. Wolfe received,  as a Limited  Partner,  8,930
shares of Common Stock and 8,930 Oustanding  Warrants in addition to the 320,000
shares of Common Stock he acquired  directly from the Company.  Dr.  McKenna and
Mr. Wolfe are consultants to the Company,  and Ms. Gray is an executive  officer
of the Company. See "MANAGEMENT" and "PRINCIPAL STOCKHOLDERS."

    In January  1997,  the Company  entered into a Research  Agreement  with USC
providing for the grant by the Company to USC of $176,000 for continued research
and development of Thiovir. See "BUSINESS -- Relationship with USC." Dr. McKenna
is the  principal  investigator  under the  research  grant and, as such,  it is
expected that he will receive salary and other benefits,  estimated at less than
$25,000, funded by the Company's research grant. See "MANAGEMENT" and "PRINCIPAL
STOCKHOLDERS." In addition,  the Company has entered into a consulting agreement
with  Dr.  McKenna.  Pursuant  to  this  agreement,  Dr.  McKenna  will  provide
consulting  services  related to the  development  of Thiovir  for a term ending
September 30, 1999. The Company will pay Dr. McKenna a semi-annual  retainer and
an hourly fee in  consideration  of such services.  See "MANAGEMENT -- Executive
Compensation and Other Information."

    Samuel P.  Sears,  Jr., a director  and  executive  officer of the  Company,
received,  in June  1996,  50,000  shares of Common  Stock  from  certain  other
stockholders of the Company without paying any monetary  consideration  therefor
as an inducement  for Mr. Sears to become  involved  with the  management of the
Company. See "MANAGEMENT" and "PRINCIPAL STOCKHOLDERS."
    

    Each of Emanuela I. Charlton, Ph.D., Thomas Quinn and W. Howard Lewin, M.D.,
directors of the Company,  received  5,000 shares of the Company's  Common Stock
from  certain   stockholders   of  the  Company   without  paying  any  monetary
consideration  therefor  as an  inducement  to  join  the  Company's 



                                       42





Board.  In  addition,  the Board  intends to grant to each of Drs.  Charlton and
Lewin and Mr. Quinn,  as of the date of  completion of the Offering,  options to
acquire  10,000 shares of Common Stock of the Company at an exercise price to be
determined,  but in no case less than $5.00 per share,  pursuant to the terms of
the Company's Incentive Plan.

    The Company believes that all of the  transactions  noted above were made on
terms no less  favorable  to the  Company  than  could have been  obtained  from
unaffiliated third parties.

   
    All future  transactions  between the Company and its  officers,  directors,
principal  stockholders  and their  respective  affiliates  will be  approved in
accordance with the Delaware General Corporation Law by a majority of the Board,
including a majority  of the  independent  and  disinterested  directors  of the
Board,  and will be on terms no less  favorable  to the  Company  than  could be
obtained from unaffiliated third parties.
    



                                       43






                            DESCRIPTION OF SECURITIES

    The  following  summary  description  of  the  Company's  capital  stock  is
qualified  in  its  entirety  by  reference  to  the  Company's  Certificate  of
Incorporation.



COMMON STOCK

   
    The Company is authorized to issue up to 25,000,000  shares of Common Stock,
$.01 par value per share. As of the date of this Prospectus, 2,643,440 shares of
Common Stock are issued and  outstanding  and held by 51 stockholders of record.
Upon the  completion of the Offering,  3,643,440  shares of Common Stock will be
outstanding.

    The holders of Common  Stock are entitled to one vote for each share held of
record  on  each  matter  submitted  to a  vote  of  stockholders.  There  is no
cumulative voting for election of directors, with the result that the holders of
more than fifty  percent of the shares  voting for the election of directors can
elect all of the directors  elected by the holders of Common  Stock.  Subject to
the prior rights of any series of Preferred Stock which may from time to time be
outstanding,  if any,  holders of Common Stock are  entitled to receive  ratably
such  dividends as may be declared by the Board out of funds  legally  available
therefor  and in the event of  liquidation,  dissolution,  or  winding up of the
Company,  are entitled to share ratably in all assets remaining after payment of
liabilities and payment of accrued dividends and liquidation  preferences on the
Preferred Stock, if any.  Holders of Common Stock have no preemptive  rights and
have no rights to convert their Common Stock into any other  securities.  All of
the outstanding shares of Common Stock are, and the shares of Common Stock to be
outstanding upon completion of the Offering will be, validly issued,  fully paid
and nonassessable.

    Prior  to  the  Offering,   the  Company's  current  principal  stockholders
beneficially owned approximately 73.7% of the outstanding shares of Common Stock
of the Company.  Subsequent to the Offering,  the  Company's  current  principal
stockholders will beneficially own 53.5% of the outstanding shares of the Common
Stock of the  Company  (51.3%  if the  Underwriters'  over-allotment  option  is
exercised in full).  As a result,  subject to the voting rights of any series of
Preferred  Stock,  they will  likely be able to control  all  matters  requiring
approval  by  the  stockholders  of  the  Company,  including  the  election  of
directors.

    Upon the  completion of the  Offering,  holders of  approximately  2,343,440
shares of Common Stock  (including the shares  issuable upon the exercise of the
Outstanding  Warrants)  will be entitled to certain  rights with  respect to the
registration  of such  shares  under the  Securities  Act,  subject  to  certain
limitations. If the Company proposes to register any of its securities under the
Securities  Act, either for its own account or for the account of other security
holders exercising  registration  rights, such holders are entitled to notice of
such  registration and are entitled to include shares therein.  These rights are
subject  to  certain   conditions  and   limitations,   including,   in  certain
circumstances,  the right of the underwriters of an offering to limit the number
of shares included in such registration or exclude all shares.

    The  holders  of the  Representative's  Warrants  also  have the right for a
period beginning one year after the effective date of this Prospectus and ending
four years thereafter,  to include shares of Common Stock issuable upon exercise
of the  Representative's  Warrants or the  Redeemable  Warrants  underlying  the
Representative's Warrants (the "Underlying Securities") as part of certain other
registered offerings of securities commenced by the Company. In addition,  for a
period beginning one year after the effective date of this Prospectus and ending
four years thereafter, upon written demand of holders representing a majority of
the  Representative's  Warrants,  the Company has agreed,  on one  occasion,  to
promptly  register the  Underlying  Securities  at the Company's  expense.  Upon
receipt of such a request,  the  Company  has agreed to use its best  efforts to
file a registration  statement registering the Underlying  Securities.  Finally,
for a period  beginning one year after the effective date of this Prospectus and
ending  four years  thereafter,  upon  written  demand of any  holder(s)  of the
Representative's  Warrants, the Company has agreed, on one occasion, to promptly
register the Underlying Securities solely at the expense of such holder(s).
    


                                       44







REDEEMABLE WARRANTS

    The following  summary  description of certain  provisions of the Redeemable
Warrants  is  believed  to reflect all  material  provisions  of the  Redeemable
Warrants,  but is not necessarily  complete and reference is made to the Warrant
Agreement  (the  "Warrant  Agreement")  by and between the Company and  American
Securities Transfer & Trust, Inc. (the "Transfer Agent").  The Warrant Agreement
has  been  filed as an  exhibit  to the  Registration  Statement  of which  this
Prospectus is a part for a detailed description thereof.

    Each Redeemable Warrant entitles the holder thereof to purchase one share of
Common  Stock at an  exercise  price of $6.50 per share.  Unless the  Redeemable
Warrants  are  redeemed  as  provided  below,  the  Redeemable  Warrants  may be
exercised  at any  time on or  before  ____________,  2002,  at  which  time the
Redeemable Warrants expire.

    The Redeemable Warrants are redeemable by the Company at $.20 per Redeemable
Warrant upon 30 days prior written notice, provided that the average closing bid
price of the Common Stock equals or exceeds $9.00 per share for a 20 consecutive
day trading period ending within 10 days prior to the notice of redemption.  For
purposes of the Warrant Agreement, "average closing bid price" is defined as the
closing  bid price as quoted  on the  Nasdaq  SmallCap  Market.  The  Redeemable
Warrants  may not be  redeemed  unless they are then  exercisable  and a current
prospectus  covering  the  Redeemable  Warrants  and the shares of Common  Stock
issuable  thereunder  is then in effect.  The  Redeemable  Warrants  will remain
exercisable  until the close of business on the fifth  business day prior to the
date of redemption.  Redemption of the Redeemable Warrants may force the holders
to exercise the Redeemable Warrants and pay the exercise price at a time when it
may be disadvantageous  for them to do so or sell the Redeemable Warrants at the
current  market price when they might  otherwise  desire to hold the  Redeemable
Warrants.

   
    Upon the exercise of the  Redeemable  Warrants more than one year after this
Offering and to the extent not inconsistent  with the guidelines of the National
Association of Securities  Dealers,  Inc., and the rules and  regulations of the
Commission,  the Company has agreed to pay the Representative a commission equal
to five percent of the exercise price of the Redeemable  Warrants.  However,  no
compensation will be paid to the  Representative in connection with the exercise
of the Redeemable  Warrants if (a) the market price of the underlying  shares of
Common Stock is lower than the exercise price,  (b) the Redeemable  Warrants are
exercised in an unsolicited transaction, or (c) the Redeemable Warrants are held
in any discretionary accounts and (d) advance disclosure is made to a Redeemable
Warrant holder. In addition,  unless granted an exemption by the Commission from
Regulation M under the Exchange Act, the Representative  will be prohibited from
engaging in any market making activities or solicited brokerage  activities with
regard to the Company's  securities  for a period of one to five days before the
solicitation of the exercise of any Redeemable Warrant or before the exercise of
any Redeemable Warrant based upon a prior  solicitation,  until the later of the
termination  of such  solicitation  activity  or the  termination  by  waiver or
otherwise  of any right the  Representatives  may have to  receive a fee for the
exercise of the Redeemable Warrants following such solicitation.
    

    The holders of the  Redeemable  Warrants  will not have any of the rights or
privileges of  stockholders  of the Company (except to the extent they otherwise
own  Common  Stock)  prior  to the  exercise  of the  Redeemable  Warrants.  The
Redeemable  Warrants  will be  entitled  to the  benefit of  adjustments  in the
exercise price and in the number of shares of Common Stock  deliverable upon the
exercise  thereof  upon the  occurrence  of certain  events,  including  a stock
dividend, stock split or similar reorganization.

    In order for a holder to  exercise  a  Redeemable  Warrant,  there must be a
current  registration  statement on file with the  Commission  and various state
securities  commissions  to register the shares of Common Stock  underlying  the
Redeemable Warrants for sale to the holder of the Redeemable  Warrant.  Pursuant
to Section  10(a)(3) of the Securities  Act, the  information  contained in this
Prospectus will be deemed "stale" nine months from the date of this  Prospectus.
The Company has agreed, so long as the Redeemable  Warrants are outstanding,  to
use its best  efforts  to keep a  registration  statement  effective  under  the
Securities Act and state securities laws to permit the issuance of the shares of


                                       45





Common Stock upon exercise or exchange of the Redeemable Warrants. Nevertheless,
although  the  Company  intends  to do so, no  assurance  can be given  that the
registration  statement will be kept current, the failure of which may result in
the  Redeemable  Warrants not being  exercisable or  exchangeable  and therefore
worthless.

REPRESENTATIVE'S WARRANTS

    In  connection  with this  Offering,  the  Company has agreed to sell to the
Representative,  at a price of $.001 per warrant,  warrants to purchase from the
Company  100,000  shares of Common Stock and 100,000  Redeemable  Warrants  (the
"Representative's Warrants"). The Representative's Warrants are exercisable at a
price of $8.00 per share of Common Stock and $.16 per  Redeemable  Warrant (160%
of the respective  initial public offering price of the Securities) for a period
of four years  commencing one year from the effective  date of this  Prospectus.
The shares of Common Stock and the Redeemable Warrants issuable upon exercise of
the  Representative's  Warrants are identical to those offered hereby except for
the exercise prices and that the Redeemable Warrants contained therein cannot be
redeemed.

   
    The Company has agreed to  register,  at its expense,  under the  Securities
Act, the  Underlying  Securities at the request of a majority in interest of the
holders thereof.  Such request may be made at any time during a period beginning
one year after the  effective  date of this  Prospectus  and  ending  four years
thereafter.  In addition,  for a period  beginning  one year after the effective
date of this Prospectus and ending four years thereafter, upon written demand of
any holder(s) of the Representative's  Warrants,  the Company has agreed, on one
occasion,  to promptly  register  the  Underlying  Securities  for purposes of a
public  offering,  solely at the expense of such  holder(s).  The  Company  also
granted  the  Representative  "piggyback"  registration  rights  concerning  the
Representative's  Warrants and the Underlying  Securities which may be exercised
at any time during a period  beginning one year after the effective date of this
Prospectus and ending four years thereafter.
    

    For the term of the  Representative's  Warrants,  the holder thereof has the
opportunity  to  profit  from  a rise  in  the  market  price  of the  Company's
securities  which may result in a dilution of the interest of the  stockholders.
The Company may find it more difficult to raise additional  equity capital if it
should be needed for the  business  of the  Company  while the  Representative's
Warrants are outstanding. At any time when the holders thereof might be expected
to exercise it, the Company would probably be able to obtain  additional  equity
capital on terms more  favorable  than those  provided  by the  Representative's
Warrants. See "RISK FACTORS -- Representative's Warrants."

PREFERRED STOCK

    The  Company is  authorized  to issue up to  1,000,000  shares of  Preferred
Stock,  $.01 par value per share, none of which are issued and outstanding as of
the date of this  Prospectus.  The Preferred  Stock may be issued in one or more
series,  the terms of which may be  determined  at the time of  issuance  by the
Board, without further action by the stockholders, and may include voting rights
(including the right to vote as a series on particular matters),  preferences as
to dividends and  liquidation,  conversion,  redemption  rights and sinking fund
provisions.  The Company has no present  plans for the issuance of any shares of
Preferred  Stock.  The  issuance of any such  Preferred  Stock could  reduce the
rights, including voting rights, of the holders of Common Stock, and, therefore,
reduce the value of the Common Stock. In particular,  specific rights granted to
future  holders of  Preferred  Stock  could be used to  restrict  the  Company's
ability to merge with or sell its assets to a third  party,  thereby  preserving
control of the Company's existing management. See "RISK FACTORS -- Anti-takeover
Effects of Certificate of Incorporation, Bylaws and Delaware Law."

DELAWARE LAW AND CERTAIN CERTIFICATE OF INCORPORATION AND BYLAW PROVISIONS

    Certain  provisions of the Delaware  General  Corporation Law, the Company's
Certificate of  Incorporation,  Bylaws and the Incentive  Plan, may be deemed to
have an  anti-takeover  effect and may delay,  defer or prevent a hostile tender
offer or takeover  attempt that a stockholder  might consider in his or her best
interest,  including  those  attempts  that might  result in a premium  over the
market price for the shares held by stockholders.


                                       46






DELAWARE ANTI-TAKEOVER LAW

   
    Section 203 of the Delaware General  Corporation Law ("Section 203") applies
to a  Delaware  corporation  with a class of voting  stock  listed on a national
securities exchange, authorized for quotation on an interdealer quotation system
or held of record by 2,000 or more persons. In general,  Section 203 prevents an
"interested  stockholder"  (defined generally as any person owning, or who is an
affiliate or associate of the  corporation  and has owned in the preceding three
years,  15  percent  or more of a  corporation's  outstanding  voting  stock and
affiliates  and  associates  of  such  person)  from  engaging  in  a  "business
transaction"  (as defined  therein) with a Delaware  corporation for three years
following  the date such  person  became an  interested  stockholder  unless (1)
before such person became an interested  stockholder,  the board of directors of
the corporation approved either the business combination or the transaction that
resulted  in the  stockholder  becoming  an  interested  stockholder;  (2)  upon
consummation  of the  transaction  which resulted in the interested  stockholder
becoming an interested stockholder, the interested stockholder owned at least 85
percent  of the  voting  stock of the  corporation  outstanding  at the time the
transaction  commenced  (excluding stock held by directors who are also officers
of the  corporation  and by employee  stock plans that do not provide  employees
with the right  to determine  confidentially  whether shares held subject to the
plan will be tendered in a tender or exchange offer); or (3) on or subsequent to
the date such person became an interested stockholder,  the business combination
is approved by the board of directors of the  corporation  and  authorized  at a
meeting of stockholders by the affirmative  vote of the holders of two-thirds of
the  outstanding  voting stock of the  corporation  not owned by the  interested
stockholder. Under Section 203, the restrictions described above do not apply to
certain business  combinations  proposed by an interested  stockholder following
the  announcement or notification of one of certain  extraordinary  transactions
involving  the  corporation  and  a  person  who  had  not  been  an  interested
stockholder  during  the  previous  three  years  or who  became  an  interested
stockholder with the approval of a majority of the corporation's directors.
    

SPECIAL MEETING OF STOCKHOLDERS

   
    The  Company's  Bylaws  currently  provide  that  special  meetings  of  the
stockholders of the Company may be called only by the Board. This provision will
make it more difficult for stockholders to take action opposed by the Board.
    

STOCKHOLDER ACTION BY WRITTEN CONSENT

    The  Certificate  of  Incorporation  provides  that no  action  required  or
permitted to be taken at an annual or special meeting of the stockholders of the
Company may be taken without a meeting.

CLASSIFIED BOARD OF DIRECTORS

   
    The Company's Certificate of Incorporation  currently provides for the Board
to be divided  into three  classes of  directors  serving  staggered  three year
terms.  As a result,  approximately  one-third of the Board will be elected each
year.  Moreover,  under the Delaware  General  Corporation Law, in the case of a
corporation  having a classified Board,  stockholders may remove a director only
for cause.  This  provision,  when  coupled  with the current  provision  of the
Company's  Bylaws  authorizing  only  the  Board  to fill  vacant  directorships
(subject  to the rights of the  holders of  Preferred  Stock),  will  preclude a
stockholder from removing  incumbent  directors without cause and simultaneously
gaining  control of the Board by filling the  vacancies  created by such removal
with its own nominees.
    

ADVANCE NOTICE REQUIREMENTS FOR STOCKHOLDER PROPOSALS AND DIRECTOR
NOMINATIONS

   
    The Company's  Bylaws  provide that  stockholders  seeking to bring business
before an annual meeting of stockholders, or to nominate candidates for election
as directors  at an annual or a special  meeting of  stockholders  in lieu of an
annual meeting (collectively,  an "Annual Meeting"),  must provide timely notice
thereof  in  writing  and be  present  at such  meeting,  either in person or by
representative.   For  the  first  Annual  Meeting  following  the  Offering,  a
stockholder's  notice shall be timely if delivered to, or mailed to and received
by, the Company at its  principal  executive  office not later than the close of
business  on the later of (A) the 75th day prior to the  scheduled  date of such
Annual  Meeting  or  (B)  the  15th  day  following  the  day  on  which  public
announcement  of the date of such of such  Annual  Meeting  is first made by the
Company.  For all subsequent  Annual Meetings,  a stockholder's  notice shall be
timely if  delivered  to,  or mailed to and  received  by,  the  Company  at its
principal executive office not less than 75 days
    


                                       47





   
nor  more  than  120  days  prior  to the  anniversary  date of the  immediately
preceding Annual Meeting (the "Anniversary Date");  provided,  however,  that in
the event the Annual Meeting is scheduled to be held on a date more than 30 days
before the Anniversary  Date or more than 60 days after the Anniversary  Date, a
stockholder's  notice shall be timely if delivered to, or mailed to and received
by, the Company at its  principal  executive  office not later than the close of
business  on the later of (A) the 75th day prior to the  scheduled  date of such
Annual  Meeting  or  (B)  the  15th  day  following  the  day  on  which  public
announcement  of the date of such Annual  Meeting is first made by the  Company.
These provisions may preclude some stockholders from bringing matters before the
stockholders at an Annual Meeting or from making nominations for directors at an
Annual Meeting.
    

AMENDMENTS TO THE BYLAWS

The Company's  Certificate of  Incorporation  and Bylaws provide that subject to
the rights of the holders of Preferred  Stock,  the majority of all directors or
the vote of holders of two-thirds of the  outstanding  stock entitled to vote is
required to alter, amend or repeal the Bylaws;  provided,  however, if the Board
has previously recommended the action to be taken to the Company's stockholders,
the affirmative  vote of a majority of the  stockholders may amend or repeal the
Company's Bylaws.

   
PROPOSED AMENDMENTS TO THE CERTIFICATE OF INCORPORATION AND BYLAWS

    Prior to  completion  of the  Offering,  the  Company  intends  to amend its
Certificate of Incorporation in the following respects:

    * The Board of Directors  will no longer be classified so that each director
      elected by the holders of the Common  Stock or  appointed  to the Board by
      the Board of Directors shall serve until the next Annual Meeting and until
      his or her successor has been duly elected and qualified.

    * All  directors  elected by the holders of the Common Stock or appointed to
      the Board by the Board of  Directors  will be subject  to removal  with or
      without cause by vote of the majority of the outstanding  shares of Common
      Stock.

    * Amendment of certain  provisions of the Certificate of Incorporation  will
      require a two-thirds vote of the stockholders.

    The foregoing amendments to the Company's  Certificate of Incorporation will
require stockholder  approval in order to become effective,  and the Company has
called a stockholders meeting to be held prior to completion of the Offering for
the purpose of considering these amendments and certain other matters.

    Prior to completion of the Offering,  and assuming  stockholder  approval of
the  foregoing  amendments  to the  Certificate  of  Incorporation,  the Company
intends to amend its Bylaws in the following respects:


    * Vacancies  occurring in the Board of Directors as a result of removal of a
      director  elected by the holders of the Common  Stock or  appointed to the
      Board by the Board of Directors by vote of such  stockholders or otherwise
      may be  filled  either  by the  Board  or by  vote  of a  majority  of the
      outstanding shares of Common Stock.

    * The holders of at least ten percent of the issued and  outstanding  shares
      of Common  Stock may  require  the  Company  to call a special  meeting of
      stockholders  by notice to the  Company  stating the purpose for which the
      special meeting is to be held. The Company must give notice of the special
      meeting within 15 days of its receipt of the stockholder  notice, with the
      meeting to be held not more than 75 days  after the date of the  Company's
      receipt of the stockholder request to call a special meeting.

    * Stockholders  may nominate a candidate  for election or  re-election  of a
      director at a special  meeting of  stockholders  called for that  purpose;
      provided that the nominations  must be submitted  within 15 days after the
      date on which  the  Company  publicly  announces  the date of the  special
      meeting.

    Assuming  stockholder  approval  of the  amendments  to the  Certificate  of
Incorporation,  the Company believes that the foregoing  proposed  amendments to
the   Certificate  of   Incorporation   and  the  By-laws  will  ameliorate  the
anti-takeover  effect of certain  provisions  of the  Company's  Certificate  of
Incorporation and Bylaws described above.

TRANSFER AGENT AND REGISTRAR
    
    American Securities Transfer & Trust, Inc. will serve as the Company's
transfer agent and registrar.



                                       48






                               UNDERWRITING

    The  underwriters  named  below  (the  "Underwriters"),  for whom  Schneider
Securities, Inc. is acting as the Representative, have severally agreed, subject
to the terms and conditions of the Underwriting Agreement (the form of which has
been filed as an exhibit to the  Registration  Statement),  to purchase from the
Company the respective numbers of shares of Common Stock and Redeemable Warrants
set forth opposite their names in the table below.  The  Underwriting  Agreement
provides  that the  obligations  of the  Underwriters  are  subject  to  certain
conditions  precedent and that the  Underwriters  shall be obligated to purchase
all of the shares of Common Stock and Redeemable Warrants, if any are purchased.

<TABLE>
<CAPTION>
                                              NUMBER OF SHARES         NUMBER OF
                     NAME                      OF COMMON STOCK    REDEEMABLE WARRANTS
                     ----                     ---------------    -------------------
<S>                                               <C>                <C>
Schneider Securities, Inc. ..................
                                                  ---------            ---------                 
   TOTAL ....................................     1,000,000            1,000,000
                                                  =========            =========
</TABLE>

    Through  the  Representative,  the  several  Underwriters  have  advised the
Company that they propose to offer the shares of Common Stock and the Redeemable
Warrants to the public at the initial  public  offering  prices set forth on the
cover of this Prospectus. The Representative has advised the Company that it may
allow to  certain  dealers  concessions  of not in  excess  of $.25 per share of
Common Stock and $.005 per Redeemable  Warrant,  of which a sum not in excess of
$.13 per share of Common Stock and $.0025 per Redeemable  Warrant may in turn be
reallowed by such dealers to other dealers.  After the issuance of the shares of
Common  Stock  and  Redeemable   Warrants,   the  public  offering  prices,  the
concessions and the reallowances may be changed.  The Representative has further
advised the Company that it does not expect sales to  discretionary  accounts to
exceed five percent of the total number of Securities offered hereby.

    The  Company  has  agreed  to pay to the  Representative  a  non-accountable
expense  allowance equal to three percent of the total proceeds of the Offering,
of which $50,000 has already been paid.

    The Company has granted an option to the  Underwriters,  exercisable  during
the 45-day period following the effective date of the Underwriting Agreement, to
purchase up to 150,000 shares of Common Stock and/or 150,000 Redeemable Warrants
at the  offering  price  less  underwriting  discounts  and the  non-accountable
expense  allowance.  The  Underwriters  may exercise such option only to satisfy
over-allotments  in the  sale of the  shares  of  Common  Stock  and  Redeemable
Warrants.

   
    Upon the exercise of the  Redeemable  Warrants  more than one year after the
Offering and to the extent not inconsistent  with the guidelines of the National
Association of Securities  Dealers,  Inc., and the rules and  regulations of the
Commission,  the Company has agreed to pay the Representative a commission equal
to five percent of the exercise price of the Redeemable  Warrants.  However,  no
compensation will be paid to the  Representative in connection with the exercise
of the Redeemable  Warrants if (a) the market price of the underlying  shares of
Common Stock is lower than the exercise price,  (b) the Redeemable  Warrants are
exercised in an unsolicited transaction, or (c) the Redeemable Warrants are held
in any discretionary  accounts. In addition,  unless granted an exemption by the
Commission   from   Regulation  M  promulgated   under  the  Exchange  Act,  the
Representative  will be prohibited from engaging in any market making activities
or solicited brokerage  activities with regard to the Company's securities for a
period  of one or five days  before  the  solicitation  of the  exercise  of any
Redeemable Warrant or before the exercise of any Redeemable Warrant based upon a
prior  solicitation,  until the later of the  termination  of such  solicitation
activity  or  the   termination   by  waiver  or  otherwise  of  any  right  the
Representative  or any other soliciting  broker-dealer may have to receive a fee
for the exercise of the Redeemable Warrants following such solicitation.

    In  connection  with the  Offering,  the  Company  has agreed to sell to the
Representative,  for  nominal  consideration,  warrants  (the  "Representative's
Warrants"),  which  confer the right to purchase up to 100,000  shares of Common
Stock and up to 100,000 Redeemable Warrants.  The Representative's
    


                                       49




Warrants are initially  exercisable at the price (the "Exercise Price") of $8.00
per  share  of  Common  Stock  and  $.16  per  Redeemable  Warrant  (160% of the
respective initial public offering prices) for a period of four years commencing
one year from the effective date of this Prospectus.  The shares of Common Stock
and Redeemable Warrants issuable upon exercise of the Representative's  Warrants
are identical to those offered hereby.  The  Representative's  Warrants  contain
provisions  providing for  adjustment  of the Exercise  Price and the number and
type of  securities  issuable upon the exercise  thereof upon the  occurrence of
certain  events.  The  Representative's  Warrants  grant to the holders  thereof
certain demand and "piggyback" rights of registration of the securities issuable
upon the exercise  thereof upon the occurrence of certain  events  beginning one
year after the date of this Prospectus.

   
    The Company has agreed to enter into a three-year  consulting agreement with
the Representative, pursuant to which the Representative will act as a financial
consultant to the Company, commencing upon the closing date of the Offering. The
Representative  will make available  qualified  personnel for this purpose.  The
consulting  fee of $3,000 per month for a period of 36 months is payable in full
at the closing of the Offering.

    Certain  principal  stockholders  and the Company  have agreed  that,  for a
period of 12  months  from the date of this  Prospectus,  they will not sell any
securities  (except for shares of Common  Stock  issued  pursuant to exercise of
options  which may be granted  under the  Incentive  Plan and for shares  issued
pursuant   to  the   exercise   of  the   Redeemable   Warrants)   without   the
Representative's   prior  written  consent,  which  shall  not  be  unreasonably
withheld.
    

    The Underwriting Agreement provides for reciprocal  indemnification  between
the Company and the Underwriters  against certain liabilities in connection with
the Registration Statement, including liabilities under the Securities Act.

   
    The foregoing  summary of certain  provisions of the Underwriting  Agreement
summarizes all of the material  provisions of the  Underwriting  Agreement,  but
does not purport to be a complete  statement of all of its terms and conditions.
A copy of the  Underwriting  Agreement  is on file  with  the  Commission  as an
exhibit to the Registration Statement of which this Prospectus is a part.

    Prior to the Offering,  there has been no public market for the  Securities.
The initial public  offering prices of the shares of Common Stock and Redeemable
Warrants  will  be  determined  by  negotiations  between  the  Company  and the
Representative  and  are  not  necessarily  related  to  the  Company's  assets,
earnings,  or book value or any other  established  criteria  of value.  Factors
considered in  determining  the initial  public  offering price of the shares of
Common Stock and Redeemable  Warrants included estimates of business  potential,
financial condition,  future prospects,  gross proceeds to be raised, percentage
of stock  owned by  officers  and  directors  on the  date  hereof,  the type of
business  in which the  Company  engages,  and an  assessment  of the  Company's
management.  The foregoing factors were evaluated in light of the existing state
of the securities market.
    


                                       50




                        SHARES ELIGIBLE FOR FUTURE SALE

   
    Upon completion of the Offering,  the Company will have 3,643,440  shares of
Common Stock outstanding (3,793,440 shares, if the Underwriters'  over-allotment
option is exercised in full).  Of these  shares,  the 1,000,000  shares  offered
hereby will be freely tradable without further registration under the Securities
Act.
    

    Up to 100,000  additional  shares of Common  Stock may be  purchased  by the
Representative  after the  first  anniversary  of this  Prospectus  through  the
exercise of the  Representative's  Warrants.  Any and all shares of Common Stock
purchased upon exercise of the Representative's Warrants may be freely tradable,
provided  that  the  Company  satisfies  certain  securities   registration  and
qualification  requirements in accordance with the terms of the Representative's
Warrants. See "UNDERWRITING."

   
    All of the  presently  outstanding  2,643,440  shares  of  Common  Stock are
"restricted securities" within the meaning of Rule 144 of the Securities Act and
will be  eligible  for  sale in the  public  market  in  reliance  upon,  and in
accordance with, the provisions of Rule 144.
    

    In  general,  Under Rule 144 as  currently  in effect,  a person (or persons
whose  shares  are  aggregated),  including  a person who may be deemed to be an
"affiliate"  of the Company as that term is defined  under the  Securities  Act,
will be  entitled  to sell  within  any  three-month  period a number  of shares
beneficially  owned for at least two years that does not  exceed the  greater of
(i) 1% of the then  outstanding  shares of  Common  Stock,  or (ii) the  average
weekly  trading  volume in the  Common  Stock  during  the four  calendar  weeks
preceding  such  sale.  Sales  under  Rule  144  are  also  subject  to  certain
requirements as to the manner of sale,  notice,  and the availability of current
public  information  about the Company.  However,  a person who is not deemed to
have been an  affiliate  of the Company  during the 90 days  preceding a sale by
such person,  and who has  beneficially  owned the shares of Common Stock for at
least three years, may sell such shares without regard to the volume,  manner of
sale, or notice requirements of Rule 144.

    Prior to this  Offering,  there has been no public  market for the Company's
Securities.  Following this Offering,  the Company cannot predict the effect, if
any,  that  sales of Common  Stock  pursuant  to Rule 144 or  otherwise,  or the
availability of such shares for sale,  will have on the market price  prevailing
from  time  to  time.  Nevertheless,   sales  by  the  current  stockholders  of
substantial  amounts of Common Stock in the public market could adversely affect
prevailing market prices for the Common Stock. In addition, the availability for
sale of a substantial  amount of Common Stock  acquired  through the exercise of
the Redeemable Warrants or the Representative's  Warrants could adversely affect
prevailing market prices for the Common Stock. The Company's officers, directors
and certain holders of 5% of the outstanding  shares of Common Stock have agreed
not to sell the  shares  beneficially  owned by such  persons  during a 12 or 13
month period following the date of this Prospectus  (except for shares of Common
Stock that are subject to the  Underwriters  over-allotment  option) without the
Representative's  consent. In addition,  the Company has agreed that it will not
issue any shares of Common Stock during a 13 month period  following the date of
this Prospectus without the Representative's written consent.


                                       51





                                 LEGAL MATTERS

    The  validity of shares of Common Stock  offered  hereby will be passed upon
for the Company by LeClair Ryan, A Professional Corporation, Richmond, Virginia,
and certain matters for the Underwriters by William M.
Prifti, Esquire, Lynnfield, Massachusetts.

                                     EXPERTS

    The financial statements of the Company as of November 30, 1996 appearing in
this  Prospectus  and  Registration  Statement  have been audited by McGladrey &
Pullen,  LLP,  independent  auditors,  as set  forth  in  their  report  thereon
appearing  elsewhere  herein  and in the  Registration  Statement  and have been
included  herein in reliance  upon such report given upon the  authority of such
firm as experts in accounting and auditing.

                              AVAILABLE INFORMATION

    The Company has filed with the Commission a  Registration  Statement on Form
SB-2 (as amended from time to time and together  with all exhibits and schedules
thereto, the "Registration  Statement") under the Securities Act with respect to
the Common Stock and the  Redeemable  Warrants to be sold in the Offering.  This
Prospectus constitutes a part of the Registration Statement and does not contain
all the  information  set forth  therein,  certain  portions  of which have been
omitted as permitted by the rules and regulations of the Commission.  Statements
contained in this Prospectus as to the content of any contract or other document
are not  necessarily  complete,  and in each instance,  reference is made to the
copy of such contract or other document filed as an exhibit to the  Registration
Statement,  each  such  statement  being  qualified  in  all  respects  by  such
reference.

    For further  information  regarding  the  Company,  the Common Stock and the
Redeemable Warrants to be sold in the Offering,  reference is hereby made to the
Registration  Statement.  A copy of the  Registration  Statement,  including the
exhibits and schedules thereto, may be inspected by anyone without charge at the
Public  Reference  Section of the Commission at Room 1024,  Judiciary Plaza, 450
Fifth Street, N.W., Washington, D.C. 20549 and at the following Regional Offices
of the Commission:  New York Regional Office, 7 World Trade Center,  13th Floor,
New York, New York 10048; and Chicago Regional Office,  500 West Madison Street,
Suite 1400, Chicago,  Illinois 60661.  Copies of the Registration  Statement and
the exhibits and  schedules  thereto can be obtained  from the Public  Reference
Section of the  Commission  upon  payment of  prescribed  fees.  In addition the
Commission  maintains a Web site that contains  reports,  proxy and  information
statements,  and other information  regarding  issuers that file  electronically
with the Commission. Such information can be accessed free of charge (other than
costs  associated with acquiring access to the Internet) at the Commission's Web
site (http://www.sec.gov).

    Prior to filing the  Registration  Statement of which this  Prospectus  is a
part, the Company was not subject to the reporting requirements of Section 13 or
15(d) of the Securities  Exchange Act. Upon  effectiveness  of the  Registration
Statement,  the Company will become  subject to the  informational  and periodic
reporting  requirements of the Exchange Act, and in accordance  therewith,  will
file  periodic  reports,   proxy  statements  and  other  information  with  the
Commission.  Such periodic reports,  proxy statements and other information will
be available for inspection and copying at the public  reference  facilities and
other regional  officers  referred to above. The Company intends to register the
Securities  offered  by  the  Registration  Statement  under  the  Exchange  Act
simultaneously  with the  effectiveness  of the  Registration  Statement  and to
furnish  its  stockholders  with annual  reports  containing  audited  financial
statements  and  quarterly  reports for the first three  quarters of each fiscal
year containing unaudited interim financial information.

    The  shares  of Common  Stock  and the  Redeemable  Warrants  registered  in
connection  with the  Offering  will be listed on the  Nasdaq  SmallCap  Market.
Reports  and other  information  required  to be filed  with such  market may be
inspected at the offices of the Nasdaq SmallCap  Market at 1735 K Street,  N.W.,
Washington, D.C. 20006.


                                       52







                              PERARDUA CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                          INDEX TO FINANCIAL STATEMENTS


<TABLE>
<CAPTION>
                                                                        PAGE
                                                                        ---- 
<S>                                                                     <C>
Independent Auditor's Report ......................................      F-2
Financial Statements:
   Balance Sheet ..................................................      F-3
   Statement of Activities ........................................      F-4
   Statement of Stockholders' Equity ..............................      F-5
   Statement of Cash Flows ........................................      F-6
   Notes to Financial Statements ..................................      F-7
</TABLE>


                                      F-1






                          INDEPENDENT AUDITOR'S REPORT

To the Board of Directors
 PERARDUA CORPORATION
 Petersburg, Virginia

    We have audited the  accompanying  balance sheet of PerArdua  Corporation (a
development  stage company) as of November 30, 1996, and the related  statements
of activities,  stockholders  equity, and cash flows for the period from July 5,
1996, date of inception,  to November 30, 1996.  These financial  statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audit.

    We  conducted  our audit in  accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.

    In our opinion,  the financial  statements referred to above present fairly,
in all material respects,  the financial position of PerArdua  Corporation as of
November 30, 1996,  and the results of its activities and its cash flows for the
period from July 5, 1996, date of inception,  to November 30, 1996 in conformity
with generally accepted accounting principles.

    The accompanying  financial  statements have been prepared assuming that the
Company  will  continue  as a  going  concern.  As  discussed  in  Note 2 to the
financial statements, the Company has suffered losses from its development stage
activities;  the  Company's  operations  will consist  primarily of research and
development  activities  over the next several  years;  and the Company does not
expect  operating  profits or significant  cash flows from operating  activities
during that period. This raises substantial doubt about the Company's ability to
continue as a going concern.  Management's  plans in regard to these matters are
also  described  in  Note  2.  The  financial  statements  do  not  include  any
adjustments that might result from the outcome of this uncertainty.



                                            MCGLADREY & PULLEN, LLP




   
Richmond,  Virginia 
January 24, 1997, except
for Note 6 as to which
the date is April 9, 1997
    



                                      F-2








                              PERARDUA CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                                  BALANCE SHEET


   
<TABLE>
<CAPTION>
                                                                             NOVEMBER 30,   FEBRUARY 28,
                                                                                 1996           1997
                                                                             ------------   ------------  
                                                                                            (UNAUDITED)
<S>                                                                          <C>            <C>
                                                 ASSETS
Current Assets:
   Cash and cash equivalents                                                 $   495,421    $   213,029
   Prepaid expenses                                                                             106,459
   Deferred offering costs                                                        29,718        171,106
                                                                             -----------    -----------
       Total current assets                                                      525,139        490,594
Equipment                                                                                         5,875
Organization costs, net of amortization                                            6,866          6,156
                                                                             -----------    -----------
                                                                             $   532,005    $   502,625
                                                                             ===========    ===========  
         
                                  LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
   Accounts payable                                                          $    20,036    $    57,231
   Accrued expenses                                                                1,482          2,001
                                                                             -----------    -----------
       Total current liabilities                                                  21,518         59,232
                                                                             -----------    -----------

Stockholders' Equity:
   Preferred Stock, par value $.01 per share, 1,000,000 shares
     authorized, none issued
   Common  Stock,  par value $.01 per  share,  25,000,000 
     authorized  2,593,440 issued and outstanding at
     November 30, 1996 (2,643,440 at February 28, 1997)                           25,934         26,434
   Additional paid-in capital                                                  2,609,739      2,644,743
   Deficit accumulated during the development stage                           (2,090,690)    (2,227,784)
   Subscription receivable                                                       (34,496)
                                                                             -----------    -----------
       Total stockholders' equity                                                510,487        443,393
                                                                             -----------    -----------
                                                                             $   532,005    $   502,625
                                                                             ===========    ===========
</TABLE>

                    See Notes to Financial Statements.
    

                                      F-3





                              PERARDUA CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                             STATEMENT OF ACTIVITIES



<TABLE>
<CAPTION>
   
                                                             PERIOD FROM                               PERIOD FROM
                                                          JULY 5, 1996, DATE     THREE MONTHS      JULY 5, 1996, DATE
                                                           OF INCEPTION, TO          ENDED          OF INCEPTION, TO
                                                          NOVEMBER 30, 1996    FEBRUARY 28, 1997    FEBRUARY 28, 1997
                                                          -----------------    -----------------    -----------------
                                                                                            (UNAUDITED)
<S>                                                          <C>                  <C>                  <C>
Revenue:
   Interest income                                           $      1,858         $    2,475           $     4,333
                                                             ------------         ----------           -----------
Expense:
   Research and development                                     2,058,980             73,249             2,132,229
   General and administrative                                      33,568             66,320                99,888
                                                             ------------         ----------           -----------
                                                                2,092,548            139,569             2,232,117
                                                             ------------         ----------           -----------

       Net loss                                              $ (2,090,690)        $ (137,094)          $(2,227,784)
                                                             ============         ==========           ===========
Net loss per common share                                    $       (.81)        $    (0.05)          $     (0.86)
                                                             ============         ==========           ===========   
Weighted average common shares                                  2,593,440          2,593,996             2,593,668
                                                             ============         ==========           =========== 
</TABLE>
    
                    See Notes to Financial Statements.



                                      F-4





                              PERARDUA CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                        STATEMENT OF STOCKHOLDERS' EQUITY




<TABLE>
<CAPTION>
   
                                  
                                                                    (DEFICIT)
                                                                   ACCUMULATED
                                  COMMON STOCK                      ADDITIONAL   DURING THE       STOCK
                                  ------------                       PAID-IN     DEVELOPMENT   SUBSCRIPTION
                                 SHARES     AMOUNT     CAPITAL        STAGE       RECEIVABLE       TOTAL
                                 ------     ------     -------        -----       ----------       -----
<S>                             <C>          <C>      <C>          <C>            <C>           <C>
Stock issued at inception
  retroactively restated to
  reflect 41 2/3 to 1 stock
  split declared on July 5,
  1996                         1,000,000    $ 10,000  $    90,200  $               $             $   100,200

Issuance (valued at $1.60
  per share) for cash and
  acquisition of technology      950,000       9,500    1,510,500                                  1,520,000

Issuance (at $1.60 per share)
  for cash, net of issuance
  costs of $48,527               643,440       6,434    1,009,039                    (34,496)        980,977

Net loss                                                            (2,090,690)                   (2,090,690)
                               ---------     -------   ----------  -----------     ---------     -----------       
Balance, November 30, 1996     2,593,440     $25,934   $2,609,739  $(2,090,690)    $ (34,496)    $   510,487
  (Unaudited)

Issuance (at $1.60 per
  share) for cash, net
  of costs of $10,000             50,000         500       35,004                     34,496          70,000
Net loss                                                              (137,094)                     (137,094)
                               ---------     -------   ----------  -----------     ---------      ----------      
Balance, February 28, 1997     2,643,440     $26,434   $2,644,743  $(2,227,784)    $       0      $  443,393
                               =========     =======   ==========  ===========     =========      ==========       
</TABLE>
    
                    See Notes to Financial Statements.


                                       F-5





                              PERARDUA CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)
                             STATEMENT OF CASH FLOWS




<TABLE>
<CAPTION>
   
                                                             PERIOD FROM                               PERIOD FROM
                                                          JULY 5, 1996, DATE     THREE MONTHS      JULY 5, 1996, DATE
                                                           OF INCEPTION, TO          ENDED          OF INCEPTION, TO
                                                          NOVEMBER 30, 1996    FEBRUARY 28, 1997    FEBRUARY 28, 1997
                                                          -----------------    -----------------    -----------------
                                                                                            (UNAUDITED)
<S>                                                           <C>                  <C>                 <C>
Development stage activities:
   Net loss                                                  $(2,090,690)          $(137,094)          $(2,227,784)
   Adjustments to reconcile net loss to net cash used in
     development stage activities:     
       Amortization                                                  237                 710                   947
       Charges to expense for value of stock issued for
        technology                                             1,519,050                                 1,519,050
       Change in operating assets and liabilities:
          Increase in prepaid expenses                                              (106,459)             (106,459)
          Increase (decrease) in accounts payable and
           accrued expenses                                       21,518             (19,517)                2,001
             Net cash used in development stage activities      (549,885)           (262,360)             (812,245)
                                                             -----------           ---------           -----------
Investing activities:
   Equipment purchases                                                                (5,875)               (5,875)
   Organization costs                                             (7,103)                                   (7,103)
                                                             -----------           ---------           -----------
             Net cash used in investing activities                (7,103)             (5,875)              (12,978)
                                                             -----------           ---------           -----------
Financing activities:
   Proceeds from issuance of common stock                      1,130,654              80,000             1,210,654
   Offering costs                                                (78,245)            (94,157)             (172,402)
                                                             -----------           ---------           -----------
             Net cash provided by financing activities         1,052,409             (14,157)            1,038,250
                                                             -----------           ---------           -----------
Net increase (decrease) in cash                                  495,421            (282,392)              213,029
Cash, beginning of period                                                            495,421
                                                             -----------           ---------           -----------
Cash, end of period                                          $   495,421           $ 213,029            $  213,029
                                                             ===========           =========            ==========
</TABLE>
    

                    See Notes to Financial Statements.


                                      F-6





                              PERARDUA CORPORATION
                          (A Development Stage Company)

                         NOTES TO FINANCIAL STATEMENTS

NOTE 1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    Nature of Business:  PerArdua  Corporation (the Company) was incorporated in
1988. The Company was a "shell" corporation, i.e. without assets or liabilities,
until July 1996, when the Company  acquired from PerArdua  Investors,  L.P. (the
Limited  Partnership)  a license  to  certain  patent  rights  to a drug  called
"Thiovir".  The Company's  operations  will focus on the  development and United
States Food and Drug  Administration  (FDA) approval of Thiovir for treatment of
HIV/AIDS  patients and patients  showing active  infection of the  opportunistic
virus cytomegalovirus (CMV) and, ultimately, commercial sale of the product.

    The  Company  is in the  development  stage.  Its major  activities  through
November  30, 1996 have been  limited to  acquiring a  licensing  agreement  and
conducting  research  and  development  related to its  proposed  product and to
obtaining  equity  capital.  These  activities  have not generated any recurring
revenues;   accordingly,  the  accompanying  financial  statements  include  the
disclosures  required by  Statement  of  Financial  Accounting  Standard  No. 7,
"Accounting and Reporting by Development Stage Enterprises".

    Accounting Estimates:  The preparation of financial statements in conformity
with  generally  accepted  accounting  principles  requires  management  to make
estimates  and  assumptions  that  effect  the  reported  amounts  of assets and
liabilities and disclosures of contingent  assets and liabilities at the date of
the  financial  statements  and the  reported  amounts of revenues  and expenses
during the reporting period. Actual results could differ from those estimates.

    Cash and Cash  Equivalents:  Cash and  cash  equivalents  includes  all cash
balances and highly liquid investments with a purchased maturity of three months
or less.  The Company  places its temporary  cash  investments  with high credit
quality  financial  institutions.  At November  30,  1996,  the Company had cash
balances in excess of insured limits.

    Research and Development: Research and development costs are expensed
as incurred.

    Income Taxes:  The Company  accounts for income taxes in accordance with the
provisions of Statement of Financial  Accounting  Standard No. 109,  "Accounting
for Income Taxes," which  utilizes an asset and liability  approach to financial
accounting  and reporting for income taxes.  Deferred tax assets are  recognized
for  deductible  temporary  differences  and operating loss and tax credit carry
forwards;   deferred  tax  liabilities  are  recognized  for  taxable  temporary
differences.  Temporary differences are the differences between reported amounts
of assets and  liabilities  and their tax bases.  Deferred income tax assets and
liabilities that will result in taxable or deductible  amounts in the future are
based  on  enacted  laws and  rates  applicable  to the  periods  in  which  the
differences  are expected to affect  taxable  income.  Valuation  allowances are
established  when necessary to reduce deferred tax assets to the amount expected
to be  realized.  The  income  tax  provision  or credit is the tax  payable  or
refundable for the period plus or minus the change during the period in deferred
tax assets and liabilities.

    Net Loss Per Common Share:  Net loss per common share is computed based upon
the weighted  average  number of common shares  outstanding  during the year. As
further  explained  in Note 3, the  Company is in the process of  preparing  its
initial public  offering (IPO) of common stock and warrants.  In accordance with
Securities  and Exchange  Commission  Staff  Accounting  Bulletin  Topic 4D, the
weighted  average  number of common shares  outstanding  includes for the entire
year, all common shares issued below the anticipated IPO price per share.

    Deferred Offering Costs:  Costs incurred in connection with the proposed IPO
have been  deferred  as of  November  30,  1996.  If the IPO is  completed,  the
deferred  offering costs will be deducted from the proceeds and charged  against
additional  paid-in  capital.  If the IPO is not  completed,  such costs will be
charged to operations.



                                      F-7




                              PERARDUA CORPORATION
                          (A Development Stage Company)

                   NOTES TO FINANCIAL STATEMENTS - (Continued)


   
NOTE 1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES --
         (CONTINUED)

    Interim Financial Information: The balance sheet as of February 28, 1997 and
the related statements of activities,  stockholders'  equity, and cash flows for
the three  months  then  ended and the  cumulative  amounts  from  inception  to
February  28, 1997 have been  prepared by the  Company,  without  audit.  In the
opinion of management,  all  adjustments  (which  include only normal  recurring
adjustments)  necessary to present fairly the financial position at February 28,
1997 and the  results  of  activities  and cash  flows for the  interim  periods
presented have been made. The statement of activities for the three months ended
February 28, 1997 is not  necessarily  indicative  of the results to be expected
for the full year.
    

NOTE 2. GOING CONCERN CONSIDERATIONS AND BASIS OF PRESENTATION

    The accompanying  financial statements have been prepared in conformity with
generally accepted  accounting  principles which contemplate the continuation of
the Company as a going  concern.  However,  during the period from July 5, 1996,
date of  inception,  to  November  30,  1996,  the  Company  incurred  a loss of
$2,090,690.  Such loss was funded  through  proceeds  received  from issuance of
common stock.  Management  believes that the Company's  operations  will consist
primarily of research and  development  activities  over the next several years,
and therefore,  it does not expect the Company to generate  operating profits or
significant cash flows from operating  activities  during that period. To obtain
the  additional  funds it needs to continue its research  activities  at planned
levels during the fiscal year ending November 30, 1997, management believes that
the  Company  will  need  substantial  funds  from  debt  obligations  or equity
financing,  such as its proposed IPO.  Management  cannot provide any assurances
that the Company will be able to obtain such financing.  These  conditions raise
substantial  doubts about the Company's  ability to continue as a going concern.
The accompanying financial statements do not include any adjustments relating to
the  recoverability  and classification of recorded asset amounts or the amounts
and classifications of liabilities that might be necessary should the Company be
unable to continue as a going concern.

NOTE 3. PROPOSED IPO

    On October 24,  1996,  the Company and an  investment  banking firm signed a
letter of intent  whereby the  investment  banking firm agreed to underwrite the
Company's IPO, which is expected to consist of 1,000,000  shares of common stock
at $5.00 per share.  Additionally,  the letter of intent  calls for  issuance of
1,000,000  redeemable warrants at a price of $.10 each with an exercise price of
$6.50 per share of common  stock for a period of 60 months  commencing  thirteen
(13) months from the  effective  date.  The warrants  will be  redeemable by the
Company  commencing  thirteen  (13) months from the  effective  date at $.20 per
warrant,  provided that the average closing bid price of the common stock equals
or exceeds $9.00 per share for 20 consecutive trading days.

   
    The letter of intent includes an over-allotment option which would allow for
the Underwriter to purchase securities, up to an additional 15% of the offering,
for a period of forty-five (45) days following the effective date solely for the
purpose of covering  any short  position in the  offering.  The Company has also
agreed  to sell  the  underwriter,  for  nominal  consideration,  five  (5) year
warrants  to  purchase  ten  percent  (10%) of the  number of  securities  being
underwritten.  These  warrants will be  exercisable  any time during a period of
four  (4)  years  commencing  one  year  from the  effective  date of the  final
prospectus at a price equaling 160% of the IPO price.
    

NOTE 4. STOCKHOLDERS' EQUITY

    On July 5, 1996, the Board of Directors and stockholders approved amendments
to the  Company's  Articles  of  Incorporation  that (i) changed the name of the
Company from Home Test Inc. to PerArdua  Corporation;  (ii) converted the no par
common stock to common stock with a par value of $0.001 per



                                      F-8




                              PERARDUA CORPORATION
                          (A Development Stage Company)

                   NOTES TO FINANCIAL STATEMENTS - (Continued)

NOTE 4. STOCKHOLDERS' EQUITY -- (CONTINUED)

share;  (iii) increased the total number of authorized common shares from 30,000
to 10,000,000;  and (iv) ordered that each share of Home Test Inc. no par common
stock be exchanged for 41 2/3 shares of PerArdua  Corporation  common stock, par
value of $0.001 per share.

    Effective   January  1997,   the  Company  was  merged  with  and  into  its
wholly-owned subsidiary PerArdua Corporation,  a Delaware corporation.  The sole
purpose of the merger was to change the Company's  jurisdiction of incorporation
from Missouri to Delaware.  As a result of the merger,  the  surviving  Delaware
corporation  assumed  all of the  assets and  liabilities  of the  Company,  and
holders of shares of common stock in the Missouri  corporation became holders of
the same number of shares of common stock in the Delaware  corporation;  the par
value of common stock was changed from $.001 per share to $.01 per share; common
stock  authorization  was increased to 25,000,000 shares and 1,000,000 shares of
$.01 par value Preferred Stock were authorized for future issuance.

    The  changes in the par value of the common  stock and the stock  split have
been retroactively  reflected in the accompanying financial statements and these
notes for the period from inception.

    On August 20, 1996, the Company issued 500,000  warrants for the purchase of
the Company's common stock. The warrants grant the holders the right to purchase
additional  shares of common stock at an exercise price of $10.00 per share. The
warrants can be exercised in whole or in part, from time to time,  following FDA
approval, with a final expiration date of June 30, 2006.

    On October 4, 1996, pursuant to a Private Placement Memorandum, dated August
20,  1996,  the Company  completed  an offering of 665,000  shares of its common
stock at $1.60 per share.  Net  proceeds to the Company were  $1,015,473,  after
related expenses of $48,527.

    During the private  placement  offering the Company  accepted a subscription
from an investor for 21,560 shares of common stock. The total  consideration for
this  subscription  was  $34,496  and has  been  recognized  as an  increase  to
additional paid in Capital.

    On August  20,  1996 the Board of  Directors  approved  the sale of  950,000
shares of common stock and warrants to purchase an additional  200,000 shares of
common stock. As more fully discussed in Note 5 below, the shares were valued at
$1.60 per share,  although the Company only received cash consideration of $.001
per  share  ($950).  The  warrants  grant  the  holders  the  right to  purchase
additional  shares of common stock at an exercise price of $10.00 per share. The
warrants can be exercised in whole or in part, from time to time,  following FDA
approval, with a final expiration date of June 30, 2006.

   
    The Board of Directors and the  stockholders of the Company approved a stock
incentive plan (the Incentive Plan) during 1996. The plan provides for grants of
incentive  stock  options or stock  appreciation  rights  only to the  Company's
employees and nonqualified  stock options and stock  appreciation  rights to the
Company's  employees,  directors,  members of the  advisory  board,  independent
contractors  or  consultants  of the Company.  The Company has reserved  500,000
shares of common stock for issuance  under the Plan. The purchase price for each
share to be awarded or sold and the exercise  price and the term for each option
or stock  appreciation  right to be  granted  under the  Incentive  Plan will be
determined by the Board of Directors or its Compensation Committee.

    On August 20, 1996 the Board of Directors  granted an officer of the Company
an option under the Incentive Plan to purchase  10,000 shares of common stock at
an  exercise  price of $7.50 per share.  The option will vest one year after the
date  employment  commences and will remain in effect for a period of five years
unless employment is terminated earlier.
    



                                      F-9




                              PERARDUA CORPORATION
                          (A Development Stage Company)

                   NOTES TO FINANCIAL STATEMENTS - (Continued)

NOTE 5. OPTION AND LICENSE AGREEMENT

    Pursuant to an agreement,  dated July 8, 1996 (the  Acquisition  Agreement),
the Company  acquired  certain rights from the Limited  Partnership.  The rights
acquired   consist  of  an  exclusive   license  to  certain  patent  and  other
intellectual property rights related to the drug, Thiovir.

   
    The Limited Partnership's sole activity was to receive capital contributions
and fund  research  and  development  of  Thiovir  from  1994 to  1996,  without
receiving any revenue. Expenditures incurred by the partnership were as follows:


<TABLE>
<CAPTION>
                                            RESEARCH AND
                                             DEVELOPMENT    OTHER       TOTAL
                                             -----------    -----       -----
<S>                                           <C>          <C>         <C>
1994 ......................................   $164,000     $12,000     $176,000
1995 ......................................     71,000      15,000       86,000
1996 ......................................     53,000      42,000       95,000
                                              --------     -------    ---------
                                              $288,000     $69,000     $357,000
                                              ========     =======     ========                 
    
</TABLE>

    The license rights are pursuant to a license  agreement  between the Limited
Partnership  and the  University of Southern  California  (USC) (the USC License
Agreement),  the rights and obligations of which were transferred by the Limited
Partnership  to the  Company  through  an  Assignment,  Assumption  and  Consent
Agreement  among the Company,  the Limited  Partnership and USC. The USC License
Agreement contains an exclusive worldwide license to practice the inventions set
forth in any relevant patents and patent applications of USC related to Thiovir.
In return,  the  Limited  Partnership  funded  development  of  Thiovir  through
research grants to USC. Funding of the research is now the responsibility of the
Company.  Subsequent to November 30, 1996,  the Company signed an agreement with
USC  providing for $ 176,000 of research  funding for the project.  The research
period will be  effective  through  September  30,  1997,  at which time USC can
request an eight month extension period at no additional cost to the Company.

    Consideration  paid by the  Company  to the  Limited  Partnership  under the
Acquisition  Agreement  consisted of $540,000 cash,  which included  $100,000 of
cash  received  from the initial  stockholders  and $440,000 paid out of the net
proceeds  of the  private  offering  (see  Note 4).  Additionally,  the  limited
partners,  together  with  USC and  three  individuals  who have  been  actively
involved in the  development  of Thiovir,  were  extended  the right,  which was
exercised,  to acquire  950,000  shares of the  Company's  common stock for $950
($.001 per share) along with warrants to purchase 200,000  additional  shares at
$10.00  per share  through  June 30,  2006.  These  warrants  will  only  become
exercisable  upon FDA approval of Thiovir.  The 950,000  shares  issued for $950
were valued at $1.60 per share as determined by the per share amount received in
the private  offering  completed  several  months  after the  completion  of the
transactions contemplated by the Acquisition Agreement.

    Charges  resulting from cash paid ($540,000) and shares issued  ($1,519,000)
under the  Acquisition  Agreement  were  recorded  as research  and  development
expense  since Thiovir is still in an early stage of  development.  The drug has
undergone  certain  laboratory  and  animal  studies,  but  must  still  undergo
successful further studies, as well as in human clinical trials, all pursuant to
protocols yet to be approved by the FDA, in order to be commercially marketable.

    The  Acquisition  Agreement  also contains a provision  whereby the purchase
price shall be adjusted  upward in the event that the Company should sell all or
any  portion of its rights in Thiovir in  consideration  of  $5,000,000  or more
prior to the filing of a registration  statement for its IPO. In that event, the
purchase price payable to the Limited  Partnership by the Company shall be equal
to 49% of the sales proceeds.


                                      F-10




                              PERARDUA CORPORATION
                          (A Development Stage Company)

                   NOTES TO FINANCIAL STATEMENTS - (Continued)

NOTE 5. OPTION AND LICENSE AGREEMENT -- (CONTINUED)

    Pursuant to the USC License Agreement (and subsequent Assignment, Assumption
and Consent Agreement), the Company will be obligated to pay royalties to USC in
conjunction  with future sales and to reimburse USC for legal  expenses that may
be incurred in connection  with patent  prosecution  and defense.  Royalties are
payable  equal to 1% of sales of the  products and 50% of any  royalties  earned
from  sublicensees.  Minimum annual royalties are payable starting at $12,500 in
1998, increasing to $125,000 in 2001 and each year thereafter.

   
NOTE 6. EMPLOYMENT AND CONSULTING AGREEMENTS
    

    On August 20, 1996 the  Company's  Board of  Directors  approved and entered
into a  Consulting  Agreement  with one of its  stockholders  for  research  and
development  activities.  The  agreement's  term  is to be for the  period  from
October 1, 1996 until  September  30, 1999 and requires  retainers of $5,000 for
the period  October 1, 1996 through March 31, 1997,  $5,000 for the period April
1, 1997  through  September  30,  1997,  $12,500 for the period  October 1, 1997
through  September 30, 1998,  and $15,000 for the period October 1, 1998 through
September  30, 1999 and a per diem of $1,000 for each full day and $600 for each
half day of consulting services provided to the Company.

   
    On February 12, 1997, the Company entered into an employment  agreement with
an  individual  who will serve as the Company's  President  and Chief  Operating
Officer.  The agreement expires on February 29, 2000, unless earlier  terminated
in accordance  with the terms  thereof,and  provides for a salary of $10,000 per
month. In addition, upon completion of the Proposed IPO, the Company is to grant
the President  options to purchase  100,000 shares of the Company's Common Stock
pursuant to the Incentive Plan. The options will vest over a two year period and
will have an exercise  price to be determined,  but in no case less,  than $5.00
per share.

    The Company has also entered into an employment agreement with a stockholder
which provides for monthly  compensation  of $7,000.  This agreement  expires on
February  29, 2000,  unless  earlier  terminated  in  accordance  with the terms
thereof.  In addition,  upon  completion  of the Proposed IPO, the Company is to
grant the stockholder options to purchase 100,000 shares of the Company's Common
Stock  pursuant to the Incentive  Plan.  The options will vest over a three year
period and will have an  exercise  price to be  determined,  but in no case less
than $5.00 per share.
    

NOTE 7. INCOME TAXES

    At November 30, 1996, the Company had net operating loss (NOL) carryforwards
available to reduce future taxable income, if any, of approximately  $37,710 for
federal  and state  income  tax  reporting  purposes  that  expire in 2011.  The
Company's  ability  to utilize  the NOL will also be  subject  to annual  limits
established by Internal Revenue Code Section 382.

The net operating loss  carryforward and a temporary  difference of $540,000 for
rights acquired under the Acquisition Agreement (see Note 5) could have resulted
in the recognition of deferred tax assets of approximately  $217,000 at November
30,  1996.  However,  due  to  the  uncertainties   inherent  in  the  Company's
operations,  the  deferred  tax assets and the  related tax  benefits  have been
offset by a valuation  allowance  in the same amount and  accordingly,  have not
been reflected in the accompanying financial statements.

    Research and development expense of $1,519,000,  represented by the value of
common stock issued  under the  Acquisition  Agreement,  is not  deductible  for
income tax purposes.


                                      F-11





================================================================================

    NO PERSON HAS BEEN AUTHORIZED IN CONNECTION WITH THE OFFERING MADE HEREBY TO
GIVE  ANY  INFORMATION  OR TO MAKE  ANY  REPRESENTATION  NOT  CONTAINED  IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE
RELIED UPON AS HAVING BEEN  AUTHORIZED BY THE COMPANY OR ANY  UNDERWRITER.  THIS
PROSPECTUS  DOES NOT  CONSTITUTE AN OFFER TO BUY ANY OF THE  SECURITIES  OFFERED
HEREBY TO ANY PERSON OR BY ANYONE IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
SALE MAKE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,  CREATE ANY IMPLICATION THAT
THE  INFORMATION  CONTAINED  HEREIN IS CORRECT AS OF ANY DATE  SUBSEQUENT TO THE
DATE HEREOF.

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

                             TABLE OF CONTENTS

<TABLE>
<CAPTION>
   
                                                                            PAGE
                                                                            ----
<S>                                                                          <C>
Prospectus Summary                                                            3
Risk Factors                                                                  6
Special Note Regarding Forward
  Looking Statements                                                         17
Use of Proceeds                                                              18
Dividend Policy                                                              18
Dilution                                                                     19
Capitalization                                                               20
Selected Financial Data                                                      21
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations                                                                 22
Business                                                                     24
Management                                                                   34
Principal Stockholders                                                       40
Certain Relationships and Related
  Transactions                                                               42
Description of Securities                                                    44
Underwriting                                                                 49
Shares Eligible for Future Sale                                              51
Legal Matters                                                                52
Experts                                                                      52
Additional Information                                                       52
</TABLE>
    
    UNTIL ________ , 1997, ALL DEALERS EFFECTING  TRANSACTIONS IN THE REGISTERED
SECURITIES, WHETHER OR NOT PARTICIPATING IN THE DISTRIBUTION, MAY BE REQUIRED TO
DELIVER A  PROSPECTUS.  THIS IS IN  ADDITION  TO THE  OBLIGATIONS  OF DEALERS TO
DELIVER A  PROSPECTUS  WHEN  ACTING AS  UNDERWRITERS  AND WITH  RESPECT TO THEIR
UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.







                              PERARDUA CORPORATION
                        1,000,000 SHARES OF COMMON STOCK
                          1,000,000 REDEEMABLE WARRANTS




                                   ----------
                                   PROSPECTUS
                                   ----------





                           SCHNEIDER SECURITIES, INC.




                                         , 1997

================================================================================







                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 24. INDEMNIFICATION OF DIRECTORS AND OFFICERS

    Section  102(b)(7)  of  the  Delaware  General  Corporation  Law  enables  a
corporation in its original certificate of incorporation or an amendment thereto
validly  approved  by the  corporation's  stockholders  to  eliminate  or  limit
personal  liability  of  members  of its Board for  violations  of a  director's
fiduciary duty of care.  However,  the elimination of limitation shall not apply
where  there has been a breach of the duty of  loyalty,  failure  to act in good
faith, engaging in intentional misconduct or knowingly violating a law, paying a
dividend or obtaining an improper personal benefit.

    In addition,  Section 145 of the Delaware General  Corporation Law permits a
corporation  organized  under  Delaware law to indemnify  directors and officers
with respect to any matter in which the director or officer  acted in good faith
and in a manner he or she  reasonably  believed  to be not  opposed  to the best
interests of the Company,  and, with respect to any criminal  action,  he or she
had reasonable cause to believe his or her conduct was not lawful.

    Article  VII,  Section  2 of  the  Company's  Certificate  of  Incorporation
provides as follows:

       Subject to the  operation of Section 4 of this Article VII, each [officer
    and director of the Company) shall be  indemnified  and held harmless by the
    [Company) to the fullest extent authorized by the General Corporation Law of
    the State of Delaware,  as the same exists or may  hereafter be amended (but
    in the  case of such  amendment,  only to the  extent  that  such  amendment
    permits the [Company) to provide  broader  indemnification  rights than such
    law permitted the [Company) to provide prior to such amendment)  against any
    and all [e)xpenses,  judgments, penalties, fines and amounts reasonably paid
    in  settlement  that are  incurred by such  [officer or director) or on such
    [officer's or director's) behalf in connection with any threatened,  pending
    or completed  [p)roceeding or any claim, issue or matter therein, which such
    [officer  or  director)  is,  or is  threatened  to be  made,  a party to or
    participant  in by  reason of such  [officer's  or  director's)  [c)orporate
    [s)tatus,  if such [officer or director) acted in good faith and in a manner
    such  [officer or director)  reasonably  believed to be in or not opposed to
    the best  interests  of the  [Company)  and,  with  respect to any  criminal
    proceeding,  has no  reasonable  cause to  believe  his or her  conduct  was
    unlawful.  The rights of  indemnification  provided by this  Section 2 shall
    continue as to an [officer or director)  after he or she has ceased to be an
    [officer  or  director)  and shall inure to the benefit of his or her heirs,
    executors, administrators and personal representatives.  Notwithstanding the
    foregoing,  the [Company) shall indemnify any [officer or director)  seeking
    indemnification in connection with a [p)roceeding initiated by such [officer
    or  director)  only if such  [p)roceeding  was  authorized  by the  Board of
    Directors of the [Company).

       In  addition,  Article VII,  Section 4 of the  Company's  Certificate  of
    Incorporation provides as follows:

       Unless ordered by a court, no indemnification  shall be provided pursuant
    to this Article VII to an [o)fficer . . . unless a determination  shall have
    been made that such  person  acted in good faith and in a manner such person
    reasonably  believed  to be in or not opposed to the best  interests  of the
    [Company) and, with respect to any criminal [p)roceeding, such person had no
    reasonable  cause  to  believe  his  or  her  conduct  was  unlawful.   Such
    determination  shall be made by (a) a majority  vote of the  [d)isinterested
    [d)irectors,  even though less than a quorum of the Board . . . (b) if there
    are no such [d)isinterested [d)irectors, or if a majority of [d)isinterested
    [d)irectors so direct by independent legal counsel in a written opinion,  or
    (c) by the stockholders of the [Company).

   
       The  Company's  Certificate  of  Incorporation  provides  for  payment of
    indemnifiable  expenses  in advance of the final  disposition  of an action,
    suit or proceeding upon receipt of an undertaking of the indemnified  person
    to repay such amount if it shall  ultimately be determined that he or she is
    



                                      II-1






   
    not entitled to be indemnified by the Company, and further provides that the
    Board of  Directors  may,  in its  discretion,  provide  indemnification  to
    non-officer employees.

       The Company  intends to enter into  indemnification  agreements  (Exhibit
    10.8 hereto) with each of its directors which attempt to provide the maximum
    protection  permitted  by Delaware  law,  as it may be amended  from time to
    time.  Under  such  additional  indemnification   provisions,   however,  an
    individual will not receive  indemnification  for judgments,  settlements or
    expenses if he or she is found  liable to the Company  (except to the extent
    the  court  determines  he or she  is  fairly  and  reasonably  entitled  to
    indemnity for expenses),  for settlements not approved by the Company or for
    settlements  and expenses if the settlement is not approved by the court. In
    the event the Company does not pay a requested  indemnification  amount, the
    indemnification  agreements will allow the indemnified party to contest this
    determination  by  bringing  an action  against  the  Company to recover the
    unpaid  amount  and costs and  expenses.  In the  event  indemnification  is
    unavailable  and the Company is found  jointly  liable with the  indemnified
    party, the  indemnification  agreements will enable the indemnified party to
    require the Company to  contribute  to the payment of damages and  expenses,
    based on the relative benefit to and fault of the indemnified  party and the
    Company.  The Company  also  intends to purchase  directors'  and  officers'
    liability insurance.

       The Underwriting  Agreement  (Exhibit 1.1 hereto) contains  provisions by
    which the Underwriters have agreed to indemnify the Company, each person, if
    any,  who  controls  the  Company  within  the  meaning of Section 15 of the
    Securities  Act,  each  director  of the  Company,  and each  officer of the
    Company who signs this Registration  Statement,  with respect to liabilities
    arising  from  information  furnished  in  writing  by or on  behalf  of the
    Underwriters for use in the Registration Statement.
    

ITEM 25. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

The following is a list of the estimated  expenses to be incurred by the Company
in connection  with the issuance and  distribution of the shares of Common Stock
being registered,  other than the underwriting discount and commissions.  All of
the following expenses will be paid by the Company.

<TABLE>
<CAPTION>
<S>                                                             <C>
   
Commission Filing Fee                                         $   4,600.00
Nasdaq SmallCap Fee                                               5,000.00
NASD Filing Fee                                                   2,000.00
Blue Sky Fees and Expenses                                       15,000.00
Non-Accountable Expense Allowance to the Representative         153,000.00
Printing and Engraving Expenses                                  40,000.00
Accounting Fees and Expenses                                     25,000.00
Legal Fees and Expenses                                          85,000.00
Transfer Agent and Registrar Fees                                 5,000.00
Consulting Fees                                                 108,000.00
Miscellaneous Fees and Expenses                                   7,400.00
                                                               -----------
  TOTAL (Estimated)                                            $450,000.00
                                                               ===========
</TABLE>
    

ITEM 26. RECENT SALES OF UNREGISTERED SECURITIES

    Since  February  , 1994,  the  Company  has sold and  issued  the  following
unregistered securities:

   
    On August 12, 1996, the Company issued  warrants to purchase an aggregate of
150,000  shares of Common Stock at $10.00 per share to The Starwood Trust for no
consideration.
    

    On August 12, 1996, the Company issued  warrants to purchase an aggregate of
150,000 shares of Common Stock at $10.00 per share to Francis E. O'Donnell,  Jr.
for no consideration.

    On August 12, 1996, the Company issued  warrants to purchase an aggregate of
200,000  shares of Common Stock at $10.00 per share to Thomas L.  DePetrillo for
no consideration.


                                      II-3






    On August 16, 1996,  the Company,  in connection  with the  acquisition of a
license of certain  rights to Thiovir,  issued an aggregate of 200,000  warrants
and 200,000  shares of Common Stock to 16 investors for a total  aggregate  cash
consideration of $200.00.  Fifteen of the investors were limited partners in the
limited  partnership which  transferred the license;  the other investor was the
University of Southern California, the licensor under the license.

    On August 16, 1996,  the Company  issued  320,000  shares of Common Stock to
Charles E. McKenna, Ph.D. for $320.00.

    On August 16, 1996,  the Company  issued  110,000  shares of Common Stock to
Mary Anthony Gray for $110.00.

    On August 16, 1996,  the Company  issued  320,000  shares of Common Stock to
Thomas D. Wolfe for $320.00.

    On September 8, 1996, the Company  issued options to purchase  10,000 shares
of Common  Stock at an exercise  price of $7.50 per share to Mary  Anthony  Gray
pursuant to the Company's Stock Incentive Plan.

    On October 4, 1996,  the Company  issued an aggregate  of 643,440  shares of
Common Stock to investors for a total, aggregate purchase price of $1,029,504.

   
    On January 9, 1997,  the Company  issued  21,560 shares of Common Stock to a
single investor for $34,496.

    On March 1, 1997,  the Company  issued  28,440  shares of Common  Stock to a
single investor for $45,504.
    

    The sales and  issuance of the  securities  in the above  transactions  were
deemed to be exempt under the  Securities  Act by virtue of Sections 3(b) and/or
4(2) thereof  and/or  Regulation D promulgated  thereunder as  transactions  not
involving any public  offering.  The purchasers in each case  represented  their
intention to acquire the securities  for investment  only and not with a view to
the distribution  thereof.  Appropriate legends were affixed to the certificates
issued in such transactions.

   
    Shortly after the  completion  of the Offering,  the Company also intends to
issue options to purchase an aggregate of 230,000  shares of Common Stock to two
Officers and three of the Company's outside directors  pursuant to the Incentive
Plan at an exercise price to be determined, but not less than $5.00 per share.
    

ITEM 27. EXHIBITS

   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                 DESCRIPTION OF EXHIBITS
 ------                                 -----------------------
<S>     <C>
1.1     -- Form of Underwriting Agreement*
1.2     -- Form of Selected Dealers Agreement*
1.3     -- Form of Agreement Among Underwriters*
2.1     -- Option and Asset Purchase Agreement, dated July 8, 1996, by and between PerArdua
           Investors, L.P. and the Company**
3.1     -- Certificate of Incorporation of Registrant*
3.2     -- Bylaws of Registrant*
4.1     -- Form of Common Stock Certificate**
4.2     -- Form of Stock Purchase Warrant*
4.3     -- Form of Private Placement Subscription Agreement*
4.4     -- Form of Acquisition Transaction Subscription Agreement**
4.5     -- Form of Representative's Warrants*
4.6     -- Form of Warrant Agreement (including form of Redeemable Warrant Certificate)**
    



                                      II-3






   
5.1     -- Form of Opinion of LeClair Ryan, A Professional Corporation**
    
10.1    -- Option & License Agreement, dated March 28, 1994, by and between PerArdua Investors,
           L.P. and the University of Southern California**
10.2    -- Stockholders' Agreement, dated July 8, 1996, by and between the Company, the
           stockholders of the Company, and the limited partners of PerArdua Investors, L.P.**
10.3    -- Research Agreement, dated January 7, 1997, by and between the University of Southern
           California and the Company*
10.4    -- Consulting Agreement, dated September 30, 1996, by and between the Company and
           Charles E. McKenna, Ph.D.*
10.5    -- Assignment, Assumption and Consent, dated as of July 31, 1996, by and between
           PerArdua Investors, L.P., the Company and the University of Southern California*
10.6    -- Form of Consulting Agreement by and between the Company and Schneider Securities,
           Inc.*
   
10.7    -- Employment Agreement, dated as of September 3, 1996 by and between the Company
           and Mary Anthony Gray, as amended**
10.8    -- Form of Indemnification Agreement**
10.9    -- Employment Agreement, dated February 12, 1997, by and between the Company and
           Nicholas Jon Virca**
10.10   -- PerArdua Corporation Stock Incentive Plan**
23.1    -- Consent of McGladrey & Pullen, LLP**
23.2    -- Consent of LeClair Ryan, A Professional Corporation (included in Exhibit 5.1 hereto)**
24.1    -- Power of Attorney (see Page II-5)*
27.1    -- Financial Data Schedule**
</TABLE>
 * Previously filed.
** Filed herewith.
    


ITEM 28. UNDERTAKINGS

    The undersigned registrant hereby undertakes:

    (1) To file,  during  any period in which it offers or sells  securities,  a
post-effective amendment to this registration statement to:

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

       (ii) Reflect in the prospectus any facts or events which, individually or
    together,   represent  a  fundamental  change  in  the  information  in  the
    registration  statement.  Notwithstanding  the  foregoing,  any  increase or
    decrease in the volume of  securities  offered (if the total dollar value of
    securities  offered  would not  exceed  that which was  registered)  and any
    deviation from the low or high end of the estimated  maximum  offering range
    may be  reflected  in the  form of  prospectus  filed  with  the  Commission
    pursuant  to Rule  424(b) if, in the  aggregate,  the  changes in volume and
    price represent no more than a 20% change in the maximum aggregate  offering
    price  set  forth in the  "Calculation  of  Registration  Fee"  table in the
    effective registration statement; and

       (iii) Include any additional or changed material information on the  plan
    of distribution.

Provided,  however,  that  paragraphs  1(i)  and  1(ii)  do  not  apply  if  the
registration  statement is on Form S-3 or Form S-8, and the information required
to be included in a post-effective amendment by those paragraphs is contained in
periodic reports filed by the registrant pursuant to Section 13 or Section 15(d)
of the Securities Exchange Act of 1934 that are incorporated by reference in the
registration statement.


                                      II-4





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

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

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

    The registrant hereby undertakes that:

    (1) For the purpose of determining  any liability  under the Securities Act,
the  information  omitted  from  the  form of  prospectus  filed as part of this
registration  statement  in reliance  upon Rule 430A and  contained in a form of
prospectus  filed by the registrant  pursuant to Rule 424(b)(1)  or(4) or 497(h)
under  the  Securities  Act  shall  be  deemed  to be part of this  registration
statement as of the time it is declared effective.

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

    The  undersigned   small  business  issuer  undertakes  to  provide  to  the
underwriters   at  the  closing   specified  in  the   underwriting   agreement,
certificates in such  denominations  and registered in such names as required by
the underwriters to permit prompt delivery to each purchaser.



                                      II-5






                                   SIGNATURES

   
    IN ACCORDANCE  WITH THE  REQUIREMENTS  OF THE SECURITIES ACT, THE REGISTRANT
CERTIFIES  THAT IT HAS  REASONABLE  GROUNDS TO BELIEVE  THAT IT MEETS ALL OF THE
REQUIREMENTS  OF FILING ON FORM SB-2 AND AUTHORIZED  THIS AMENDMENT NO. 1 TO THE
REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED,  IN THE IN
THE CITY OF RICHMOND, COMMONWEALTH OF VIRGINIA, ON APRIL 23, 1997.


                                         PERARDUA CORPORATION
                                       


                                         By:  /s/ NICHOLAS JON VIRCA
                                         ----------------------------------     
                                               NICHOLAS JON VIRCA
                                           PRESIDENT AND CHIEF OPERATING
                                                    OFFICER

    PURSUANT TO THE REQUIREMENT OF THE SECURITIES ACT, THIS REGISTRATION
STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE CAPACITIES AND
ON THE DATES INDICATED:



<TABLE>
<CAPTION>
                     NAME                                      TITLE                    DATE
                     ----                                      -----                    ----
<S>                                             <C>                              <C>



                * 
 -------------------------------------         Chairman of the Board and          April 23, 1997
   FRANCIS E. O'DONNELL, JR., M.D.,              Chief Executive Officer
                                                 (Principal Executive   
                                                 Officer) and Director
                                                 
 
- --------------------------------------          Treasurer (Principal Financial    April 23, 1997
         SAMUEL P. SEARS, JR.                     Officer), Secretary and     
                                                  Director              
                                                
                                              
                *                    
- --------------------------------------          Director                          April 23, 1997
     EMANUELA I. CHARLTON, PH.D.


                *        
- --------------------------------------          Director                          April 23, 1997
          THOMAS QUINN



                *            
- --------------------------------------          Director                          April 23, 1997
       W. HOWARD LEWIN, M.D.



     */s/ SAMUEL P. SEARS, JR.
- --------------------------------------
        ATTORNEY-IN-FACT

</TABLE>
    

                                      II-6





                               EXHIBIT INDEX


<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                 DESCRIPTION OF EXHIBITS
 ------                                 -----------------------
<S>     <C>
   
1.1     -- Form of Underwriting Agreement*
1.2     -- Form of Selected Dealers Agreement*
1.3     -- Form of Agreement Among Underwriters*
2.1     -- Option and Asset Purchase Agreement, dated July 8, 1996, by and between PerArdua
           Investors, L.P. and the Company**
3.1     -- Certificate of Incorporation of Registrant*
3.2     -- Bylaws of Registrant*
4.1     -- Form of Common Stock Certificate**
4.2     -- Form of Stock Purchase Warrant*
4.3     -- Form of Private Placement Subscription Agreement*
4.4     -- Form of Acquisition Transaction Subscription Agreement**
4.5     -- Form of Representative's Warrants*
4.6     -- Form of Warrant Agreement (including form of Redeemable Warrant Certificate)**
5.1     -- Form of Opinion of LeClair Ryan, A Professional Corporation**
10.1    -- Option & License Agreement, dated March 28, 1994, by and between PerArdua Investors,
           L.P. and the University of Southern California**
10.2    -- Stockholders' Agreement, dated July 8, 1996, by and between the Company, the
           stockholders of the Company, and the limited partners of PerArdua Investors, L.P.**
10.3    -- Research Agreement, dated January 7, 1997, by and between the University of Southern
           California and the Company*
10.4    -- Consulting Agreement, dated September 30, 1996, by and between the Company and
           Charles E. McKenna, Ph.D.*
10.5    -- Assignment, Assumption and Consent, dated as of July 31, 1996, by and between
           PerArdua Investors, L.P., the Company and the University of Southern California*
10.6    -- Form of Consulting Agreement by and between the Company and Schneider Securities,
           Inc.*
10.7    -- Employment Agreement, dated as of September 3, 1996 by and between the Company
           and Mary Anthony Gray, as amended**
10.8    -- Form of Indemnification Agreement**
10.9    -- Employment Agreement, dated February 12, 1997, by and between the Company and
           Nicholas Jon Virca**
10.10   -- PerArdua Corporation Stock Incentive Plan**
23.1    -- Consent of McGladrey & Pullen, LLP**
23.2    -- Consent of LeClair Ryan, A Professional Corporation (included in Exhibit 5.1 hereto)**
24.1    -- Power of Attorney (see Page II-5)*
27.1    -- Financial Data Schedule**
</TABLE>
 * Previously filed.
** Filed herewith.
    



                      OPTION AND ASSET PURCHASE AGREEMENT


     This Option and Asset Purchase  Agreement (the  "Agreement")  is made as of
this 8th day of July 1996, by and between  PerArdua  Corporation,  a corporation
organized  under the laws of the State of  Missouri  (hereinafter  "Buyer")  and
PerArdua Investors,  L.P., a limited partnership organized under the laws of the
State of California (hereinafter "Seller").

     This   Agreement  is  made  with  respect  to  the   following   facts  and
circumstances.

     A. Seller possesses a certain  exclusive  license to manufacture and market
products related to a pharmaceutical  drug called  Thiofoscarnet or Thiovir,  as
more  particularly  described in that certain Option & License Agreement between
the University of Southern  California  ("USC") and Seller effective as of March
28,  1994,  a copy of which,  as amended,  is  attached  hereto as Exhibit A (as
amended, the "License Agreement");

     B.  Buyer  desires  to grant  Seller an option to  purchase  the  foregoing
assets; and

     C.  Seller  and Buyer have  agreed  upon the terms and  conditions  of such
option and the exercise thereof.

     NOW,  THEREFORE,  for good and  valuable  consideration,  the  receipt  and
sufficiency  of  which is  hereby  acknowledged  ,  Seller  and  Buyer  agree as
follows:

1. DEFINITIONS.

     The  terms  below  shall,  for the  purpose  of this  Agreement,  have  the
following meanings:

     (a) "Agreement" shall mean this Option and Asset Purchase Agreement.

     (b) "Assets" shall mean (1) any and all license and option rights of Seller
described  in the  License  Agreement;  (2) the  rights  to the use of the  name
"PerArdua" or any variation  thereof to the extent Seller  possesses such rights
as of the date of this Agreement  (the  "Corporate  Name");  (3) all of Seller's
right, title and interest to any and all trade secrets,  technical  information,
test  data,   clinical  trial  data,   products,   inventions,   product  design
information, copyrights, trademarks and any other intellectual property relating
in any way to TPFA,  or any  other  anti-viral  drug,  and any and all  physical
properties,  including without limitation written documents,  print-outs, notes,
tapes, films, blueprints, drawings, sketches, diskettes,





floppy  disks,  or  the  like,  which  embody  any of  the  foregoing  described
intellectual  property to the extent Seller possesses such rights as of the date
of this  Agreement;  and (4) all of Sellers   right,  title and  interest in and
under  those  certain  Research  Agreements  listed on Appendix B of the License
Agreement.
                   (c) "Assumable  Liabilities"  means those current liabilities
of  Seller,  which  shall be assumed  by Buyer to the  extent  provided  in this
Agreement  and which  are more  particularly  described  on  Exhibit B  attached
hereto.

                   (d)  "Closing"  shall  mean  delivery  by Buyer and Seller of
those items  specified in Sections 7.2 and 7.3 hereof,  which closing shall take
place by delivery of signed  documents  by each party and delivery by Buyer of a
certified check on the Closing Date in the offices of Greene, Radovsky,  Maloney
&  Share  LLP  ("GRM&S"),   Spear  Street  Tower,  Suite  4200,  San  Francisco,
California.
                   (e)  "Closing  Date"  shall  mean the date  which is five (5)
business  days  following  the date on  which  the  Option  Exercise  Notice  is
delivered to the Company.


                   (f)  "Corporate  Name"  shall have the  meaning  set forth in
Section  l(b) of this  Agreement.  

                   (g) "Notice of USC Consent"  shall mean the notice  delivered
by Seller to Buyer  notifying  Buyer that USC has consented to the assignment of
the License Agreement.

                   (h) "Option" shall mean the option  described in Section 2 of
this Agreement.

                   (i) "Option Exercise Notice" shall mean the  notice of option
exercise  delivered  by  Buyer  to Seller  notifying  Seller of Buyer's exercise
of the option.

                   (j) "Option Exercise Period" shall mean the period commencing
the date hereof and ending at 5:00 p.m. local time on September 15, 1996.

                   (k) "Option  Premium" shall mean One Hundred Thousand Dollars
($100,000)  cash,  which Option  Premium shall be payable as provided in Section
2.2 hereof.

                   (l) "Purchase  Price" shall be Three Hundred  Fifty  Thousand
Dollars  ($350,000) plus the amount, if any, of the Assumable  Liabilities which
have been paid by Seller on or prior to the Closing Date,  which  Purchase Price
shall be payable as provided in Section 3.1, subject to adjustment in accordance
with Section 8 of this Agreement.

                                        2




                   (m)   "Stockholders'   Agreement"  shall  mean  that  certain
agreement  among  the  Buyer's  stockholders,  a form of which  is set  forth on
Exhibit C hereto. 

                   (n) "TPFA"  shall mean the drug  known as  Thiofoscarnet  and
Thiovir.

2. OPTION.

         2.1.  Grant of  Option.  Seller  hereby  grants to Buyer  the option to
purchase the Assets on the terms and conditions set forth in this Agreement. 

         2.2.  Option  Premium.  Within three (3)  business  days of the date on
which Buyer  receives  the Notice of USC  Consent,  Buyer shall  pay  Seller the
Option Premium by certified check made payable to GRM&S as consideration for the
grant of the Option.  This Option  Premium  shall not be applied to the Purchase
Price, and shall be retained by Seller whether or not the Option is exercised.

         2.3.  Exercise of Option.  The Option is exercisable at any time during
the Option  Exercise Period by delivery of the Option  Exercise  Notice.  If the
Option is not exercised during the Option Exercise Period, it shall lapse and be
of no further force and effect.

         2.4. Acknowledgement of Deliveries by Buyer. Seller hereby acknowledges
receipt of each of the following from the Buyer:

               2.4.1. The Stockholders' Agreement duly executed by the Buyer and
by Francis E. O'Donnell, Jr., Samuel P. Sears, Jr., as Trustee for the Jonnie R.
Williams Irrevocable Trust #1, Samuel P. Sears, Jr. and Thomas DePetrillo.

               2.4.2. Duly executed stock certificates and stock warrants of the
Buyer  representing  Buyer's  Common Stock and issued in the names,  and for the
amounts, set forth on Exhibit E attached hereto.

         2.5.   Acknowledement  of  Deliveries  by  Seller.   The  Buyer  hereby
acknowledges receipt of each of the following from Seller:

               2.5.1.  Stock  subscription  forms duly  executed  by each of the
individuals and/or entities listed on Exhibit E attached hereto.

               2.5.2.  The Stockholders' Agreement, duly executed by each of the
individuals and/or entities set forth on Exhibit E.



                                       3



               2.5.3.  The  letter with  respect  to the  Corporate  Name,  duly
executed by Seller and by PerArdua,  Inc.,  as general  partner of Seller in the
form attached hereto as Exhibit F.

3. PURCHASE AND SALE.

         3.1. Purchase and Sale;  Purchase Price.  Subject to the conditions set
forth in this Agreement,  upon Buyer's exercise of the Option in accordance with
this Agreement,  Seller shall sell, and Buyer shall purchase,  the Assets on and
as of the Closing Date in consideration of payment of the Purchase Price.

         3.2.  Payment Terms. The Purchase Price shall be paid to  Buyer in cash
by certified check payable to GRM&S at the Closing.

4. ASSUMPTION OF OBLIGATIONS AND LIABILITIES.
   
         4.1. Assumable  Liabilities.  In connection with the purchase described
in this  Agreement,  Buyer shall assume the balance,  if any, of those Assumable
Liabilities  which  have not been  paid  prior to the  Closing  Date.  As of the
Closing,  Buyer does assume and agree to pay when due and perform  those  debts,
liabilities, obligations and contracts of any kind and nature as provided in the
Assignment of License Agreement set forth in Exhibit G.

         4.2.  Indemnity.  Buyer hereby agrees to save Seller  harmless from and
indemnify and defend Seller against any and all injury, loss, damage,  liability
(or any claims in  respect  to the  foregoing),  costs or  expenses  (including,
without  limitation,  attorneys' fees,  reasonable  investigation  and discovery
costs),  of whatever  nature,  to any person or property caused or claimed to be
caused  by or  resulting  from  the  violation,  alleged  or  otherwise,  of any
provision of the License  Agreement  which occurs or is claimed to have occurred
on or after the Closing Date.

 5. WARRANTIES AND REPRESENTATIONS.

         5.1. Buyer's Warranties and Representations.  Buyer hereby warrants and
represents the following: 

               5.1.1  Organizational  Power;  Qualification.   The  Buyer  is  a
corporation duly organized, validly existing and in good standing under the laws
of  Missouri,  has  all  requisite  corporate  power  and  authority  to own its
properties  and to carry on its business as now being and hereafter  proposed to
be  conducted,  and is duly  qualified  and  authorized  to do  business in each
jurisdiction  in which  Buyer  is  required  to be so  qualified.  Buyer  hereby
certifies that, except as provided in the preceding sentence,  there is no other
jurisdiction  in  which the properties owned by Buyer or the business  conducted
by Buyer or hereafter


                                       4



proposed  to be  conducted  by Buyer  would make such  qualification  necessary.

               5.1.2.  Capital  Structure.  The authorized  capital stock of the
Buyer consists solely of 10,000,000 shares of common stock,  $.001 par value, of
which  1,000,000  shares  are  validly  issued and  outstanding,  fully paid and
nonassessable  (the "Buyer's  Common  Stock").  The owners of the Buyer's Common
Stock are set forth on Exhibit D attached  hereto.  There are no  outstanding or
authorized subscriptions,  warrants, options calls, rights, commitments or other
agreements or  understandings  of any character  which  obligate or may obligate
Buyer to issue any  additional  shares of its  capital  stock or any  securities
convertible  into or evidencing the right to subscribe for any shares of Buyer's
capital stock, except as may be set forth on said Exhibit D.

               5.1.3.  Authorization  of Agreement.  The Buyer has the right and
power and has taken all  necessary  action to execute,  deliver and perform this
Agreement  and all documents  executed by Buyer in accordance  with the terms of
this  Agreement.  This  Agreement has been duly executed and delivered by a duly
authorized  officer of the Buyer and is a legal, valid and binding obligation of
the Buyer, enforceable in accordance with its terms.

               5.1.4. No  Subsidiaries.  Buyer has no interest in any subsidiary
corporations,  nor is Buyer a participant in any joint  venture,  partnership or
similar arrangement.

               5.1.5.  Compliance  of  Agreement.  The  execution,  delivery and
performance of this Agreement on the part of the Buyer and the  consummation  by
Buyer of the transactions  contemplated in this Agreement in accordance with its
terms does not (a) require the consent,  approval or authorization of any person
or governmental entity, (b) violate any applicable law relating to the Buyer, or
(c) conflict  with,  result in a breach of, or  constitute  a default  under any
provision  of the charter  documents  or by-laws of Buyer,  or any  restriction,
lien, encumbrance, indenture, contract, lease, sublease, loan agreement, note or
other obligation,  agreement,  instrument or liability to which Buyer is a party
or is bound or to which any of its assets are subject, or result in the creation
of any lien or encumbrance upon said assets or Buyer's Common Stock.

               5.1.6.  No Litigation.  There is currently no claim,  litigation,
proceeding  or  governmental  investigation  pending  or  threatened  against or
relating to Buyer or the  transactions  contemplated  by this  Agreement.  Buyer
shall give Seller immediate notice of any such claim,  litigation  proceeding or
investigation which becomes known to it on or before the Closing Date.



                                       5





               5.1.7. Tax Compliance. All United States federal, state and local
and  foreign  national,  provincial  and  local and all  other  taxes,  customs,
impositions,  assessments and other charges in the nature thereof, which are due
and payable, have been paid or otherwise satisfied in full.


               5.1.8.  Compliance  with Laws.  Currently  and as of the  Closing
Date, Buyer is in compliance with all federal, state and local laws, ordinances,
rules and, to the best knowledge of Buyer,  has not been cited for the violation
of any such law, rule, ordinance or regulation.

               5.1.9.  Financial Condition.  As of the date hereof, but prior to
the performance of the  obligations to be performed at the Closing,  the Buyer's
accrued  liabilities  (the  "Accrued  Liabilities")  shall  not  exceed  Twenty
Thousand Dollars ($20,000) in the aggregate,  all as more particularly  shown on
the balance sheet and pro forma financial statements attached hereto as Schedule
1. As of the  date  hereof  and  the  Closing  Date,  there  are no  outstanding
liabilities or other monetary  obligations or other  agreements or understanding
to make monetary  payments,  authorized or unauthorized,  of any character which
relate to Buyer in any way or manner other than the Accrued Liabilities as shown
on Schedule 1.

               5.1.10.  Agreements.  There  are  no  outstanding  agreements  or
understandings,  authorized or unauthorized,  of any character which obligate or
may obligate  Buyer in any way or manner other than those  agreements  listed on
Schedule 2 attached hereto and incorporated  herein, a full and complete copy of
each of which has been previously delivered to Seller.

               5.1.11.  Brokers/Finders.  No  broker,  finder,  agent or similar
intermediary  has acted on behalf of the Buyer in connection with this Agreement
or the transactions contemplated hereby, and there are no brokerage commissions,
finders fees, or similar fees or  commissions in connection  therewith  based on
any agreement,  arrangement or understanding  with the Buyer or any action taken
by the Buyer.

               5.1.12.  Completeness  of  Warranties  and  Representations.  All
representations and warranties  contained in this Section 5.1 or made in writing
by Buyer in connection  with the  transaction  herein provided for shall be true
and correct on the date hereof, and on the Closing Date as if made on that date,
and  liability  for  misrepresentation  or breach of warranty or covenant  shall
survive the execution and delivery of this Agreement and the Closing as provided
in Section 9.7. In addition,  none of the representations and warranties made in
this Section 5.1 contains any untrue  statement of a material  fact, or omits to
state a material fact necessary to make the statements



                                       6




made, in the light of the  circumstances  under which such statements were made,
not   misleading.   It  is  agreed  that   Seller's   damages   resulting   from
misrepresentation  or breach of warranty  or  covenant  by Buyer shall  include,
without  limitation,  court costs and  reasonable  attorney's  fees,  reasonably
incurred or sustained by Seller in connection therewith.

         5.2. Seller's Warrant and  Representations.  Seller hereby warrants and
represents, to the best of its knowledge, the following:

               5.2.1.  Organizational  Power;  Qualification.  The  Seller  is a
limited partnership duly organized,  validly existing and in good standing under
the  laws of  California,  has all  requisite  power  and  authority  to own its
properties  and to carry on its business as now being and hereafter  proposed to
be  conducted,  and is duly  qualified  and  authorized  to do  business in each
jurisdiction  in which  Seller is required  to be so  qualified.  Seller  hereby
certifies that, except as provided in the preceding sentence,  there is no other
jurisdiction in which the properties owned by Buyer or the business conducted by
Buyer  or  hereafter   proposed  to  be  conducted  by  Buyer  would  make  such
qualification necessary.

               5.2.2. General Partner. The sole general partner of the Seller is
PerArdua,  Inc., a  corporation  duly  organized,  validly  existing and in good
standing under the laws of California.  PerArdua,  Inc., has the corporate power
and authority to act as general partner of Seller.

               5.2.3.  Authorization of Agreement.  The Seller has the right and
power and has taken all necessary action to authorize it to execute, deliver and
perform this  Agreement in accordance  with its terms.  This  Agreement has been
duly  executed and  delivered by a duly  authorized  officer of PerArdua,  Inc.,
acting in the name and on behalf of PerArdua,  Inc. as the sole general  partner
of the  Seller.  This  Agreement  is a legal,  valid and binding  obligation  of
Seller, enforceable in accordance with its terms.

               5.2.4. Compliance of Agreement. Except for the consent referenced
in Section 6.3, the execution, delivery and performance of this Agreement on the
part  of  the  Seller  and  the  consummation  by  Seller  of  the  transactions
contemplated  in this Agreement in accordance  with its terms do not (a) require
the consent, approval or authorization of any person or governmental entity, (b)
violate any applicable law relating to the Seller,  (c) conflict with, result in
a breach  of,  or  constitute  a  default  under any  provision  of the  charter
documents  or  by-laws  of  Seller,  or  (d)  violate  any  restriction,   lien,
encumbrance, indenture, contract, lease, sublease, loan agreement, note or other
obligation, agreement, instrument or liability to which



                                       7



Seller  is a party or is bound or to which any of its  assets  are  subject,  or
result in the creation of any lien or encumbrance upon said assets. 


               5.2.5.  No Litigation.  There is currently no claim,  litigation,
proceeding  or  governmental  investigation  pending  or  threatened  against or
relating  to the  Assets or the  transactions  contemplated  by this  Agreement.
Seller  shall  give  Buyer  immediate  notice  of  any  such  claim,  litigation
proceeding  or  investigation  which becomes know to it on or before the Closing
Date.

               5.2.6. Tax Compliance. All United States federal, state and local
and  foreign  national,  provincial  and  local and all  other  taxes,  customs,
impositions,  assessments and other charges in the nature thereof, which are due
and payable, have been paid or otherwise satisfied in full.

               5.2.7. Financial Condition.  The Assumable Liabilities constitute
the only  liabilities of the Seller as of the date of this Agreement.  There are
no other  liabilities of any kind,  whether  accrued,  accruable,  contingent or
otherwise,  of  Seller  as  of  said  date,  except  contingent  liabilities  to
University of Southern California and BioStrategics International, Inc.

               5.2.8.  Brokers/Finders.  Except with respect to those contingent
amounts which may become due to BioStrategics International, Inc., and Toni Gray
in  connection  with this  transaction  as referenced  in Section  5.2.7,  which
contingent  amounts  the Seller has agreed to pay, no broker,  finder,  agent or
similar  intermediary  has acted on behalf of the Seller in connection with this
Agreement or the transactions  contemplated  hereby,  and there are no brokerage
commissions,  finders  fees,  or  similar  fees  or  commissions  in  connection
therewith based on any agreement,  arrangement or understanding  with the Seller
or any action taken by the Seller.

               5.2.9.  Completeness  of Warranties and  Representations.  To the
extent provided herein,  all  representations  and warranties  contained in this
Section  5.2 or made in writing  by Seller in  connection  with the  transaction
herein  provided  for shall be true and correct on the date  hereof,  and on the
Closing Date as if made on that date,  and  liability for  misrepresentation  or
breach of warranty or covenant  shall survive the execution and delivery of this
Agreement  and the Closing as provided in Section 9.7. In addition,  none of the
representations  and  warranties  made in this  Section 5.2  contains any untrue
statement of a material  fact,  or omits to state a material  fact  necessary to
make the  statements  made, in the light of the  circumstances  under which such
statements  were  made,  not  misleading.  It is  agreed  that  Buyer's  damages
resulting  from  misrepresentation  or breach of  warranty or covenant by Seller
shall include, without limitation, court costs




                                       8






and reasonable  attorney's fees,  reasonably  incurred or sustained by Seller in
connection therewith.

               5.2.10. Negation of Warranties.



               (a)  Nothing  in this  Agreement  shal1 be  construed  as:  (i) a
warranty or  representation by Seller as to the validity or scope of the Patent,
as defined in the License Agreement,  and/or Patent  Application,  as defined in
the License Agreement;  (ii) a warranty or representation that any Products,  as
defined in the License  Agreement,  made,  used,  sold or otherwise  disposed of
under any license granted in this Agreement or the License  Agreement is or will
be free from infringement of patents of third parties; or (iii) an obligation to
bring or prosecute actions or suits against third parties for infringement.

               (b)  Seller   makes  no  express   or   implied   warranties   of
merchantability or fitness for a particular  purpose,  nor does Seller represent
that the rights granted  hereunder will result in Products that are commercially
successful.

               (c) Buyer  further  agrees  that it will not rely upon  technical
information  provided by Sellers in developing  and  manufacturing  any Products
hereunder,  but will independently test, analyze and evaluate all Products prior
to manufacture and distribution of such Products. 

6. CONDITIONS.

         6.1.  Conditions to Obligations of Buyer.  The obligations of the Buyer
to be performed at the Closing in accordance  with Section 7.2 of this Agreement
shall be subject and conditional upon each of the following,  all or any portion
of  which  may be  waived  by  Buyer  in its  sole  discretion  (singularly  and
collectively,  the "Buyer  Waived  Condition"),  which waiver shall be evidenced
only by a written  instrument  executed by the Buyer and which waiver shall also
automatically  waive Buyer's right to claim a breach of this Agreement by Seller
based upon lack of performance by Seller of any such Buyer Waived Condition:

               6.1.1.  All of the warranties and  representations  of the Seller
set forth in Section 5.2 of this Agreement  shall be true and complete on and as
of the Closing Date.

               6.1.2.  All of the  obligations  of the Seller to be performed at
the Closing shall have been performed in full.

               6.1.3.  No  action,  proceeding,  investigation,   regulation  or
legislation shall have been instituted  threatened or proposed before any court,
governmental  agency or legislative  body to enjoin,  restrain or prohibit or to
obtain substantial  damages in respect,  of or which is related to or arises out
of



                                       9




this Agreement or the consummation of the transactions contemplated hereby.

         6.2. Conditions to Obligations of Seller. The obligations of the Seller
to be performed at the Closing in accordance with Section 7.3 of this  Agreement
shall be subject and conditional upon each of the following,  all or any portion
of which  may be  waived  by  Seller  in its  sole  discretion  (singularly  and
collectively,  the "Seller Waived  Condition"),  which waiver shall be evidenced
only by a written instrument  executed by the Seller and which waiver shall also
automatically waive Seller's right to, claim a breach of this Agreement by Buyer
based upon lack of performance by Buyer of any such Seller Waived Condition:


               6.2.1. All of the warranties and representations of the Buyer set
forth in Section 5.1 of this  Agreement  shall be true and complete on and as of
the Closing Date.

               6.2.2. All of the obligations of the Buyer to be performed at the
Closing shall have been performed in full.

               6.2.3.  No  action,  proceeding,  investigation,   regulation  or
legislation shall have been instituted, threatened or proposed before any court,
governmental  agency or legislative  body to enjoin,  restrain or prohibit or to
obtain substantial damages in respect of or which is related to or arises out of
this Agreement or the consummation of the transactions contemplated hereby.

         6.3.  Approval  by  USC.   Notwithstanding   the  above  conditions  to
performance by Buyer and Seller of their respective obligations hereunder at the
Closing,  the  Closing  shall not be deemed to have  occurred  unless  and until
formal  approval  of the  assignment  of the Assets by USC in a form  reasonably
satisfactory to the parties is received by Buyer and a copy thereof is delivered
to Seller.  Buyer and Seller each agree to make best efforts to secure  approval
of the assignment of the Assets by USC as soon as practicable  after the date of
this Agreement. 

7. CLOSING TRANSACTIONS.

         7.1. Closing.  The purchase and sale of the Assets shall be effected on
the Closing Date at the Closing.

         7.2.  Delivery  by Buyer.  The  Buyer  shall  deliver  to Seller at the
Closing the Purchase  Price in the  amount and the manner set forth in Article 3
of this Agreement. 

         7.3.  Delivery  by  Seller.  The Seller  shall  deliver to Buyer at the
Closing the Assignment of the License  Agreement in the form attached hereto and
incorporated herein as Exhibit G.



                                       10





         7.4. Name Change. The Seller and its General Partner shall do all acts
necessary to enable Buyer to amend its Articles of  Incorporation  to change its
name to PerArdua, Inc. including executing any necessary consents,  certificates
of  amendment,  or any other  document  prepared  by  Buyer.  

8.  ADJUSTMENT TO PURCHASE PRICE

         8.1.  Adjustment To Purchase  Price For Assumable  Liabilities.  In the
event the aggregate amount of Assumable  Liabilities is reduced below that total
amount listed in Exhibit B on or before the Closing, the Purchase Price shall be
adjusted at the Closing to equal Three Hundred Fifty Thousand Dollars ($350,000)
plus that amount by which the aggregate amount of Assumable Liabilities has been
so reduced (the "Reduced Amount").

         8.2.  Post-Closing  Adjustment  to Purchase  Price.  In the event Buyer
shall sell all or any portion of the Assets in  consideration  for Five  Million
Dollars  ($5,000,000)  or more at any time  prior to the date the Buyer may file
with the  Securities and Exchange  Commission a  registration  statement for the
sale of Buyer's  securities in an initial public  offering of such securities to
the public,  then the Purchase Price shall  automatically be equal to forty-nine
percent  (49%) of the  consideration  received by Buyer from said sale of Assets
(the  "Asset  Consideration").  Within ten (10) days after  receipt of the Asset
Consideration,  Buyer shall pay to Seller the balance of the Purchase  Price (as
adjusted  pursuant to this  Section 8.2) which has not  previously  been paid to
Seller. In the event that all or any portion of said Asset Consideration is paid
to Buyer in securities or other  instruments or property,  then the amount to be
paid to  Seller  hereunder  may be paid by  Buyer  in such  securities  or other
instruments or property pro rata to the extent received by Buyer.

9. MISCELLANEOUS

         9.1.  Notices.  All  notices  under  this  Agreement  shall  be  deemed
delivered upon personal delivery to Buyer or Seller, as the case may be, or five
(5)  business  days after  deposit  in the United  States  mail,  registered  or
certified,  postage  fully  prepaid and  addressed  to the  respective  parties,
effective on delivery (or deemed delivery) or on receipt if by reputable courier
service  which  provides  written  evidence  of  delivery,  or on receipt at the
telephone number  designated herein if by telephone  facsimile (i.e.  "fax"), to
the addresses  stated in the first  paragraph of this  Agreement,  or such other
address as the parties may from time to time  designate  in writing.  Notices to
any party shall be sent to it at the following address,  or any other address of
which the other party is notified in writing:



                                       11




          If to the Buyer:              PerArdua    Corporation,    a   Missouri
                                        corporation  c/o  Francis E.  O'Donnell,
                                        Jr.,  M.D. 709 The Hamptons Lane, Town &
                                        Country,   Missouri   63017  Fax:  (314)
                                        434-7030 -

          If to the Seller:             PerArdua  Investors,  L.P. c/o Martin I.
                                        Zankel 900 Front  Street,  Suite 300 San
                                        Francisco, CA 94111 Fax: (415) 956-1152


         9.2.  Binding Effect; Assignment.  All the provisions of this Agreement
shall be binding  upon and inure to the benefit of the parties  hereto and their
respective  successors and assigns. No assignment hereof shall relieve any party
of its obligations hereunder.

         9.3. Amendments. Any term, agreement or condition of this Agreement may
be amended or waived if,  but only if,  such  amendment  or waiver is in writing
signed all the parties hereto or, in the case of a waiver,  by the party waiving
an obligation, or condition applicable to the other party.

         9.4. Severability.  Any provision of this Agreement which is prohibited
or  unenforceable  in  any  jurisdiction  shall,  as  to such  jurisdiction,  be
ineffective only to the extent of such prohibition or  unenforceability  without
invalidating  the remainder of the such  provision or the  remaining  provisions
hereof or affecting  the  validity or  enforceability  of such  provision in any
other jurisdiction.

         9.5.  Governing  Law. This  Agreement  shall be construed in accordance
with and governed by the laws of the State of California.

         9.6.  Counterparts.  This  Agreement  may be  executed in any number of
counterparts,  each of which when so executed  shall be deemed to be an original
and shall be binding upon all parties,  their successors and assigns, and all of
which taken together shall constitute one and the same agreement.

         9.7. Survival. The representations and warranties contained in Sections
5.1 and 5.2 of this Agreement shall survive the Closing for a period of one year
(the "Limitation  Period") and shall be in addition to any other  obligations or
liabilities  either  party  hereto may have to the other  party at common law or
otherwise.



                                       12





         9.8.  Attorneys'  Fees.  In  the  event  of  litigation,   arbitration,
mediation, or other proceeding  ("Proceeding") is initiated by any party against
any  other  party  to  enforce,   interpret  or  otherwise  obtain  judicial  or
quasi-judicial relief in connection with this Agreement, the prevailing party in
such  Proceeding  shall be entitled to recover from the  unsuccessful  party all
costs,  expenses,  and actual  attorney's fees relating to or arising out of (1)
such Proceeding (whether or not such Proceeding  proceeds to judgment),  and (2)
any post-judgment or post-award  proceeding  including without limitation one to
enforce  any  judgment  or award  resulting  from any such  Proceeding. Any such
judgment or award shall  contain a specific  provision  for the  recovery of all
such  subsequently  incurred costs,  expenses,  and actual attorney's fees.

         9.9. Further Assurances. Seller and Buyer each agree to execute any and
all documents and agreements  reasonably requested by the other party to further
evidence or effectuate this Agreement. 

         9.10. Termination of Agreement.

               9.10.1.  This  Agreement may be  terminated  prior to the Closing
upon the occurrence of the following:

                   (a) At the election of the Seller,  if any one or more of the
conditions to its  obligation to close has not been  fulfilled as of the Closing
Date, or shall have become  incapable of  fulfillment  prior to such time, or if
the Buyer has  breached any  material  covenant or  agreement  contained in this
Agreement;

                   (b) At the  election of the Buyer,  if any one or more of the
conditions to its  obligation to close has not been  fulfilled as of the Closing
Date, or shall have become  incapable of  fulfillment  prior to such time, or if
the Seller has  breached any  material  covenant or agreement  contained in this
Agreement;

                   (c) At the  election  of either the  Seller or the Buyer,  if
formal  approval of the assignment of the Assets by USC is not received at least
ten (10) days prior to the Closing Date;

                   (d) At the election of either the Seller or the Buyer, if the
consummation of the transaction  contemplated  hereunder are enjoined by a final
order of a court of competent jurisdiction from which no appeal may be taken; or

                   (e) At any time on or prior to the  Closing  Date,  by mutual
written  consent of the Seller and the  Buyer.  

In the event this Agreement is terminated as provided above, the Agreement shall
immediately thereupon become null and void and



                                       13





         shall have no further force or effect,  except to the extent  otherwise
provided herein.

         9.11.  Limitation on  Liability.  If Buyer or Seller shall be more than
one person or entity,  the obligation of either Buyer or Seller  hereunder shall
be joint and several.  Except as  specifically  provided  herein,  no trustee or
beneficiary  of  any  trust,   no  officer,   shareholder  or  director  of  any
corporation,  no partner in any joint venture or partnership,  and no individual
or other entity who or which holds either  Buyer's or Seller's  interest in this
Agreement  shall be  personally  liable  for any of the  agreements,  express or
implied,  hereunder  except that such  Agreement  shall,  as the case may be, be
binding  upon  (i) the  trustees  of a trust  personally  as  trustees,  but not
individually,  and upon the trust estate, or (ii) upon an individual, a group of
individuals jointly and severally,  joint venture or partnership but only to the
extent of their  ownership  interest  in this  Agreement  and the  proceeds  and
profits  therefrom.  Nothing in this Section 9.11 shall be construed as a bar to
any injunctive remedy or equitable relief available to either Buyer or Seller.

         9.12. Time of Essence.  Time is of the essence of this Agreement. 

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first written above.

Buyer:                                        Seller:

PerArdua Corporation,                         PerArdua Investors, L.P.,
a Missouri corporation                        a California corporation
                
                                              
/s/ Samuel P. Sears, Jr.                      By: PerArdua, Inc., a
- ----------------------------                      California corporation
By: Samuel P. Sears, Jr.                          Its General Partner
    Treasurer                        

                                              By: /s/ Herbert A. West
                                                  -----------------------
                                                   Herbert A. West
                                              Its: Vice President



                                       14


                                                                     EXHIBIT 4.1


                              PERARDUA CORPORATION

NUMBER                                                                    SHARES

INCORPORATED UNDER THE LAWS                  SEE REVERSE FOR CERTAIN DEFINITIONS
OF THE STATE OF DELAWARE                                       CUSIP 713603 10 8


This Certifies that




is the record holder of

  FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, $.01 PAR VALUE, OF
                              PERARDUA CORPORATION
transferable  on the books of the  Corporation by the holder hereof in person or
by  duly  authorized  attorney,  upon  surrender  of this  certificate  properly
endorsed.  This  certificate  is not valid until  countersigned  by the Transfer
Agent  and  registered  by the  Registrar. 

WITNESS the facsimile seal of the  Corporation  and the facsimile  signatures of
its duly authorized officers.


Dated:

/s/ Samuel P. Sears, Jr.

SECRETARY                                                   PRESIDENT


                                 CORPORATE SEAL


COUNTERSIGNED AND REGISTERED:

American Securities Transfer & Trust, Inc.
P.O. Box 1596
Denver, Colorado 80201

By
  ---------------------------------
Transfer Agent Authorized Signature

     The  Corporation  shall furnish  without charge to each  stockholder who so
requests a statement  of the powers,  designations,  preferences  and  relative,
participating,  optional or other  special  rights of each class of stock of the
Corporation   or  series   thereof  and  the   qualifications,   limitations  or
restrictions of such preferences  and/or rights.  Such requests shall be made to
the Corporation's Secretary at the principal office of the Corporation.


     The following  abbreviations,  when used in the  inscription on the face of
this  certificate,  shall be  construed  as though they were written out in full
according to applicable laws or regulations:

        TEN COM --      as tenants in common
        TEN ENT --      as tenants by the entireties
        JT TEN  --      as joint tenants with right of
                        survivorship and not as tenants
                        in common
        

UNIF GIFT MIN ACT       --      .................. Custodian ...................
                                         (Cust)                   (Minor)
                                under Uniform Gifts to Minors
                                Act ............................................
                                                          (State)
                UNIF TRF MIN ACT  --  ............. Custodian (until age ......)
                                         (Cust)
                                ........................ under Uniform Transfers
                                        (Minor)
                                to Minors Act ..................................
                                                             (State)


    Additional abbreviations may also be used though not in the above list.

     FOR  VALUE  RECEIVED,  ________________________  hereby  sell,  assign  and
transfer unto


PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE








- --------------------------------------------------------------------------------
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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

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

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

____________________________________________________________________     Shares

of the  common  stock  represented  by the  within  Certificate,  and do  hereby
irrevocably constitute and appoint

____________________________________________________________________   Attorney

to transfer  the said stock on the books of the within  named  Corporation  with
full power of substitution in the premises.

Dated ______________________________

                                  X___________________________________________

                                  X___________________________________________

                            NOTICE:  THE  SIGNATURE(S)  TO THIS  ASSIGNMENT MUST
                                     CORRESPOND WITH THE NAME(S) AS WRITTEN UPON
                                     THE  FACE  OF  THE   CERTIFICATE  IN  EVERY
                                     PARTICULAR,     WITHOUT    ALTERATION    OR
                                     ENLARGEMENT OR ANY CHANGE WHATEVER.





Signature(s) Guaranteed









By ____________________________________

THE SIGNATURE(S) SHOULD BE GUARANTEED BY
AN   ELIGIBLE   GUARANTOR    INSTITUTION
(BANKS,  STOCKBROKERS,  SAVINGS AND LOAN
ASSOCIATIONS  AND  CREDIT  UNIONS)  WITH
MEMBERSHIP  IN  AN  APPROVED   SIGNATURE
GUARANTEE  MEDALLION PROGRAM PURSUANT TO
S.E.C. RULE 17Ad-15.


                             SUBSCRIPTION AGREEMENT

         This  Subscription  Agreement (the  "Agreement") is made by and between
PerArdua Corporation, a Missouri corporation (the "Company") and the undersigned
subscribing investor ("Subscriber").

I. Subscription and Payment.

       1.  Acknowledgment of Receipt.  By executing this Subscription  Agreement
Subscriber   acknowledges  receipt  of  a  copy  of  the  Confidential  Offering
Memorandum dated July 8, 1996 (the "Memorandum").

       2. Subscription and Payment.  Subscriber hereby subscribes for __________
Shares of Common Stock,  par value $.001 per share (the "Shares") of the Company
and One (1) Warrant to purchase__________  Shares at a price of $10.00 per Share
(the "Warrant",  and together with the Shares, the "Units"), at a total purchase
price of  $__________  and hereby  delivers a check in said  amount to cover the
full purchase price of such Units.

       3.  Representations  and  Warranties.  Subscriber  hereby  represents and
warrants to the Company as follows:


                   (a)  SUBSCRIBER  HAS  READ  CAREFULLY  AND   UNDERSTANDS  THE
MEMORANDUM AND HAS CONSULTED HIS OWN ATTORNEY,  ACCOUNTANT OR INVESTMENT ADVISOR
WITH RESPECT TO THE INVESTMENT  CONTEMPLATED  HEREBY AND THE SUITABILITY OF SUCH
INVESTMENT FOR THE SUBSCRIBER.  ANY SPECIFIC ACKNOWLEDGMENT SET FORTH BELOW WITH
RESPECT TO ANY  STATEMENT  CONTAINED  IN THE  MEMORANDUM  SHALL NOT BE DEEMED TO
LIMIT THE GENERALITY OF THIS REPRESENTATION AND WARRANTY;

                   (b) The Company has made available to the Subscriber,  during
the  course  of  this  transaction  and  prior  to  the  purchase  of any of the
securities  referred to herein,  the opportunity to ask questions of and receive
answers from  officers and  directors  of the Company  concerning  the terms and
conditions  of the  offering  described  in the  Memorandum,  and to obtain  any
additional  information  necessary  to verify the  information  contained in the
Memorandum  or  otherwise  relative to the  financial  data and  business of the
Company, to the extent that such parties possess

                                       l.




such information or can acquire it without unreasonable effort or expense;

                   (c) The  Subscriber  has adequate  means of providing for his
current  needs  and  personal  contingencies  and has no need for  liquidity  in
connection with this investment;

                   (d) The Subscriber's  overall commitment to investments which
are illiquid is not disproportionate to the net worth of the Subscriber, and the
Subscriber's  investment  in the Shares and Warrant  will not cause such overall
commitment to become excessive;

                   (e) The Subscriber is purchasing  the Shares and Warrant for
Subscriber's  own  account  for  investment  only,  and  without any view to the
distribution thereof or resale to others;

                   (f)  Subscriber  has evaluated  the risks of  purchasing  the
Shares  and  Warrant,  including  those  risks  particularly  described  in  the
Memorandum,  and has  determined  that the  Shares  and  Warrant  are a suitable
investment,  that Subscriber has adequate fluancial  resources for an investment
of such character,  and that at this time Subscriber  could bear a complete loss
of this investment;
                   (g)  Subscriber understands that all documents,  instruments,
records,  and books pertaining to the Company and this investment have been made
available to  Subscriber  and, if  requested,  to his  attorney,  accountant  or
investment adviser;
                   (h)  Subscriber  has been advised and is aware that (i) there
is no public market for the Shares or Warrant and there is no assurance that any
public  market  will  develop,  (ii) it may not be possible  to  liquidate  this
investment,  and (iii) Subscriber must bear the economic risk of this investment
in the Shares and Warrant for an  indefinite  period of time  because the Shares
and  Warrant  have not been  registered  under the  Securities  Act of 1933,  as
amended (the "Act") or under any applicable state securities or "blue sky" laws,
and, therefore, cannot be sold unless they are subsequently registered under the
Act or such applicable state laws, or unless an exemption from such registration
is available;


                                       2.




                   (i) Subscriber will not sell or otherwise transfer any or all
of the Shares or Warrant without  registration  under the Act and the applicable
state  laws or  unless an  exemption  therefrom  is  available,  and  Subscriber
understands  that the Company  has no  obligation  to effect  such  registration
(except as provided herein) or to comply with any such exemption;

                   (j)  Subscriber  acknowledges  that if this  subscription  is
accepted by the Company,  the certificate  evidencing the Shares and the Warrant
purchased  by  Subscriber  will  bear a legend  reciting  the  substance  of, or
otherwise  referring to the  restrictions  on transfer of the Shares and Warrant
described above, and acknowledges that notations restricting the transfer of the
Shares and  Warrant  may also be made on the  records of the  Company and a stop
transfer  order may be entered  with the  Companys'  transfer  agent,  if one is
appointed;

                   (k) If the Subscriber is a corporation or partnership,  it is
authorized to make the investment  contemplated  herein,  and the person signing
this Subscription Agreement on behalf of such entity has been duly authorized by
such entity to do so;

                   (l) No  representations  or warranties  have been made to the
undersigned by any officer,  director,  employee or agent of the Company,  other
than as set forth herein and in the Memorandum;

                   (m)  Subscriber  understands  that this offering has not been
reviewed,  nor have the merits been passed upon, by the  Securities and Exchange
Commission  nor by agencies or  officials of any state,  including  the state in
which Subscriber is a resident;

                   (n) Except for the  Memorandum  and such other  documents and
information  which  Subscriber has requested in writing in connection  with this
offering  has not  considered  or relied  upon any other  offering  material  or
literature of the Company in connection with Subscriber's  decision to make this
investment.

                   Subscriber  understands the meaning and legal consequences of
the  foregoing  representations  and  warranties  which  are true as of the date
hereof and will be true as of the date of the purchase of the Shares and Warrant
subscribed for herein.  Each such representation and Warranty shall survive such
purchase.

                                       3.





II. Representations. Warranties and Covenants of the Company

       1. The  Company  hereby  represents  and  warrants to the  Subscriber  as
follows:
                   
                   (a) All of the  representations  and  warranties set forth in
the Option and Asset Purchase  Agreement are hereby made to the Subscriber,  and
are true and  correct  as of the  date  hereof,  except  with  respect  to those
representations and warranties which are made as of a date specified therein, in
which  case  such  representations  and  warranties  are  hereby  made as of the
specified date.

                   (b)  The  Company  has  provided  the  Subscriber   with  all
information   reasonably  available  to  it  without  undue  expense  that  such
Subscriber  has  requested  for  deciding  whether to purchase the Units and all
information  that the Company  believes is  reasonably  necessary to enable such
Subscriber to make such decision.  To the best of the Company's  knowledge after
reasonable investigation,  neither the Memorandum, the Option and Asset Purchase
Agreement or any other written  agreements,  statements or certificates  made or
delivered in connection  herewith or therewith contain any untrue statement of a
material fact or omit to state a material fact  necessary to make the statements
therein or herein not misleading.

                   (c) All of the  representations  made by the  Company  herein
shall survive the closing of the sale of Shares pursuant to this Agreement.

       2. The Company hereby covenants as follows:

                   (a)  Limitations  on  Subsequent   Registration  Rights.  The
Company shall not (i) grant, at any time, any "piggyback" registration rights on
terms more favorable than those granted hereunder,  and (ii) grant, prior to the
initial public  offering of the Company's  securities,  any demand  registration
rights unless such demand  registration  rights are also granted to the Holders,
as defined hereafter, on the same terms and conditions.

                   (b) Rule 144 Reporting.  With a view to making  available the
benefits of certain rules and  regulations of the Commission that may permit the
sale of the Restricted Securities

                                       4.





to the public without  registration,  the Company agrees to use its best efforts
to:

              (i)  Make  and  keep  public  information  regarding  the  Company
     available as those terms are  understood  and defined in Rule 144 under the
     Securities  Act, at all times from and after ninety (90) days following the
     effective date of the first  registration under the Securities Act filed by
     the Company for an offering of its securities to the general public;

              (ii) File with the  Commission  in a timely manner all reports and
     other  documents  required of the Company under the  Securities Act and the
     Exchange  Act at  any time  after it has become  subject to such  reporting
     requirements;

              (iii) So long as a Holder owns any Restricted Securities,  furnish
     to the Holder  forthwith  upon written  request a written  statement by the
     Company as to its compliance  with the reporting  requirements  of Rule 144
     (at any time from and after ninety (90) days  following the effective  date
     of the first registration statement filed by the Company for an offering of
     its  securities to the general  public),  and of the Securities Act and the
     Exchange  Act (at any time  after it has become  subject to such  reporting
     requirements),  a copy of the most recent annual or quarterly report of the
     Company,  and such other  reports  and  documents  so filed as a Holder may
     reasonably  request in  availing  itself of any rule or  regulation  of the
     Commission   allowing  a  Holder  to  sell  any  such  securities   without
     registration. 

III. Registration Riahts.

         1. If the  Company  proposes  to  file a  registration  statement  (the
"Registration  Statement") for  registration of any shares of Common Stock under
the  Securities  Act other than a  registration  relating  solely to an employee
benefits plan or a corporate  reorganization or other transaction under Rule 145
or a registration on any form that does not permit  secondary sales, the Company
will: 

              (i) Give written  notice of such intention to the holder of Common
     Stock purchased hereby (a "Holder," and

                                       5.
         




     together with other holders of Common Stock originally  purchased  pursuant
     to  Subscription  Agreements in the form hereof executed in connection with
     the Option and Asset  Purchase  Agreement  between the Company and PerArdua
     Investors,  L.P.,  the  "Holders")  at least  thirty (30) days prior to the
     proposed filing date; and

              (ii) Use its best  efforts  to include  in such  registration  the
     number  of  shares of the  Holder's  Common  Stock  which  were  originally
     purchased  hereby  (the  "Registrable  Securities")  specified  in a notice
     received by the Company  within  twenty (20) days of the date of the notice
     specified in (i) above is mailed or delivered to the Holder.

Notwithstanding the foregoing, if in any firmly underwritten public offering the
managing  underwriter thereof determines that any of the Registrable  Securities
of the Holders  and any other  holders of  registration  rights must be excluded
from the  registration  as a result of marketing  factors,  which  determination
shall be given in writing, the number of shares of Registrable  Securities owned
by the Holders to be  included  in the  offering  shall be  allocated  among the
Holders and any other holders of registration rights pro rata in accordance with
the  number  of  shares  of  Common  Stock  requested  to be  included  in  such
registration.

         2. If and  whenever the Company is required by the  provisions  of this
Section to use its best  efforts to include any  Registrable  Securities  in any
registration  of any of its  securities  under the  Securities  Act, the Company
will, as expeditiously as possible and at its sole cost and expense:

                   (i)  cause any  registration  statement  filed to become  and
     remain effective until all of the Registrable  Securities are sold, but not
     for any period longer than nine months;

                   (ii) prepare and file with the Commission such amendments and
     supplements  to such  registration  statement  and the  prospectus  used in
     connection  therewith  as  may  be  necessary  to  keep  such  registration
     statement effective and to comply with the provisions of the Securities Act
     with  respect  to  the  disposition  of  all  securities  covered  by  such


                                       6.






     registration  statement whenever the Holders shall desire to dispose of the
     same;

                   (iii) furnish to each  Holder  such  number  of  copies  of a
     summary prospectus or other prospectus, including a preliminary prospectus,
     in conformity  with the  requirements  of the Securities Act and such other
     documents as such Holder may reasonably  request in order to facilitate the
     disposition of the securities owned by such Holder; and

                   (iv)  use  its  best  efforts  to  register  or  qualify  the
     securities  covered  by  such  registration   statement  under  such  other
     securities  or blue sky laws of such  jurisdictions  as each  Holder  shall
     request  and ase its best  efforts  to do any and all other acts and things
     which may be reasonably  necessary to enable such Holder to consummate  the
     disposition in such jurisdiction of the securities owned by such Holder.

                   (v) cause all such Registrable Securities registered pursuant
     hereunder  to be  listed  on each  securities  exchange  on  which  similar
     securities issued by the Company are then listed.

                   (vi)  provide  a  transfer   agent  and   registrar  for  all
     Registrable  Securities registered pursuant to such registration  statement
     and a CUSIP number for all such  Registrable  Securities,  in each case not
     later than the effective date of such registration.

         3. The Company shall pay all expenses  incurred by it in complying with
this Article III (including without limitation all registration and filing fees,
printing expenses and fees and disbursements or counsel for the Company) but not
the fees and disbursements of counsel for the Holders.

         4. In the event of any  registration of any of its securities under the
Securities  Act pursuant to this  Section,  the Company will  indemnify and hold
harmless  the Holder of such  securities  and each  other  person,  if any,  who
controls  such Holder  within the meaning of the  Securities  Act and each other
perso~  who  participates  in the  offering  of  such  securities,  against  any
expenses,  losses,  claims,  damages or liabilities,  joint or several, to which
such Holder or controlling person or 


                                       7.





participating  person may become  subject under the Securities Act or otherwise,
in so far as such expenses, losses, claims, damages or liabilities (or action in
respect  thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained,  on the effective date thereof,
in any qualification or registration  statement under which such securities were
registered  under the  Securities Act or qualified  under any  applicable  state
securities law, any preliminary prospectus or final prospectus contained therein
or any amendment or  supplement  thereto,  or any document  incident to any such
registration or qualification  (collectively the "Offering Documents"), or arise
out of or are based upon the  omission or alleged  omission  to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein  not  misleading,  or any  violation  of  the  Securities  Act or  State
securities  law or any  other  regulation  thereunder  in  connection  with  any
registration,  qualification  or compliance,  and will reimburse such Holder and
each such controlling person or participating  person for any legal or any other
expenses  reasonably  incurred  by such  Holder  or such  controlling  person or
participating  person in  connection  with  investigating  or defending any such
loss, claim, damage,  liability or action;  provided,  however, that the Company
will not be liable in any such case to the extent that any such  expense,  loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged  untrue  statement or omission or alleged  omission made in any Offering
Document in reliance upon and in conformity with written  information  furnished
to the Company through an instrument  duly executed by such Holder  specifically
for use in the  preparation  thereof.  Each  Holder  shall,  upon the receipt of
notice of the commencement of any action against such Holder or against any such
controlling person or participating person, in respect of which indemnity may be
sought from the Company on account of the indemnity  agreement contained in this
Article  III,  Section  4,  promptly  notify  the  Company  in  writing  of  the
commencement  thereof.  The  omission of such Holder so to notify the Company of
any such  action  shall not relieve the  Company  from any  liability  which the
Company  may have to such  Holder or such  controlling  person or  participating
person on account of the  indemnity  agreement  contained in this Section to the
extent such failure is not prejudicial. In case any such action shall be brought
against any Holder or any such controlling  person or  participating  person and
such Holder shall notify the Company of the commencement


                                       8.






thereof,  the Company  shall be entitled to  participate  in (and, to the extent
that the Company  sr.all wish,  to direct) the defense  thereof at the Company's
own expense, in which event the defense shall be conducted by recognized counsel
chosen by the Company and reasonably satisfactory to the Holder. In the event of
any  registration  by the Company o- any of its securities  under the Securities
Act pursuant to this Section,  the Holder of the  securities so registered  will
indemnify  and hoId  harmless  the Company and each other  person,  if any,  who
controls the Company  within the meaning of the  Securities Act and each officer
and  director of the  Company and the other  Holders to the same extent that the
Company agrees to indemnify it, but only with respect to the written information
relating to such Holder  furnished  to the Company by such Holder as  aforesaid.
Notwithstanding  the  foregoing,  in no event shall any  indemnity by the Holder
exceed the gross  proceeds from the sale of Registrable  Securities  received by
such Holder in the Offering. 

IV. General.

         1. The  Agreement  (i) shall be  binding  upon and  shall  inure to the
benefit of the Subscriber and the heirs, legal representatives,  successors, and
assigns of the  Subscriber,  (ii) shall be governed,  construed  and enforced in
accordance with the laws of the State of Missouri (except insofar as affected by
the  state  securities  or "blue  sky"  laws of the  jurisdiction  in which  the
offering  described  herein has been made to the Subscriber as  aforesaid),  and
(iii) shall,  if the Subscriber  consists of more than one person,  be the joint
and several obligation of all such persons.

         2. This Agreement  constitutes the final and entire  agreement  between
the parties  hereto with respect to the subject matter  hereof,  and,  except as
herein  provided,  may be amended or waived only by a writing executed by all of
the parties hereto.

                                       9.




         3. All notices or other communications given or made hereunder shall be
in writing and shall be delivered  or mailed by  registered  or certified  mail,
return  receipt  requested,  postase  prepaid,  to Subscriber at the address set
forth on the signature page hereof,  and to the Company at its address set forth
in the Memorandum. 

         EXECUTED as of the date set forth below.

Date:_____________________, 1996

                                   If an individual:

                                   SUBSCRIBER:

                                   ________________________

                                   ________________________
                                   Print Name

                                   If a corporation or other entity:

                                   ________________________

                                   By:_____________________ 
                                   
                                   Its:____________________


                                   ACCEPTED:

                                   PerArdua Corporation

                                   By:_____________________
                                  
                                   Its:____________________



                                       10.

                                                                     EXHIBIT 4.6



                                WARRANT AGREEMENT


         PERARDUA  CORPORATION,  a Delaware  corporation  (the  "Company"),  and
AMERICAN  SECURITIES  TRANSFER & TRUST, INC. (the "Warrant  Agent"),  a Colorado
corporation, agree as follows:

         1.  PURPOSE.  The  Company  proposes  to  publicly  offer  and issue an
aggregate of 1,000,000 Redeemable Warrants (the "Redeemable Warrants").

         2.  REDEEMABLE  WARRANTS.  Each  Redeemable  Warrant  will  entitle the
registered  holder  thereof (the "Warrant  Holder") to purchase from the Company
one share of the  Company's  Common  Stock,  $.01 par  value per share  ("Common
Stock") at an exercise price of $6.50 per share (the "Exercise Price").

         3. EXERCISE PERIOD.  Subject to Section 5, the Redeemable  Warrants may
be   exercised   on  any  date  at  any  time   during  the  period   commencing
__________________,  1998 (the "Commencement  Date") and ending at 5:00 p.m. New
York time on  _________,  2002 (the  "Expiration  Date"),  except as  altered by
Section 13 of this Agreement. If the Expiration Date shall be a holiday or a day
on which  banks  are  authorized  to close in the  State of New  York,  the term
"Expiration  Date" shall mean 5:00 p.m. New York time on the next  following day
which is not a holiday or a day on which  banks are  authorized  to close in the
State of New York.  Following the Expiration  Date, all  unexercised  Redeemable
Warrants will be void and all rights of Warrant Holders shall cease.

         4.  DETACHABILITY.  The Redeemable Warrants shall trade separately from
shares of the Company's Common Stock in the marketplace.

         5. REDEMPTION OF REDEEMABLE WARRANTS.

                  a. REDEMPTION;  REDEMPTION PRICE. Commencing _________,  1998,
the Company may from time to time redeem the Redeemable Warrants, in whole or in
part,  at $.20 per  Redeemable  Warrant (the  "Redemption  Price") upon 30 days'
written  notice,  provided  that the average  closing bid price of the Company's
Common Stock equals or exceeds $9.00 per share for a twenty consecutive  trading
day period  ending  within 10 days prior to the  Company  issuing  its notice of
redemption  ("Notice of  Redemption").  For the purposes of this Agreement,  the
term  "closing  bid price"  shall mean the  closing  bid price of the  Company's
Common Stock, as quoted on the Nasdaq SmallCap  Market.  If the Company's Common
Stock is no longer quoted on the Nasdaq SmallCap Market, the "closing bid price"
shall  mean the  average  of the high bid and low ask price  for the  Redeemable
Warrants  on any  inter-dealer  quotation  system  used in  connection  with the
trading of the  Redeemable  Warrants at the time of  redemption.  If the Company
shall determine to redeem less than all of the outstanding  Redeemable Warrants,
the Warrant Agent shall determine the Redeemable Warrants to be redeemed by such
manner  or method as it shall  deem fair and  appropriate,  either by lot or pro
rata among all Warrant Holders.






                  b. NOTICE OF REDEMPTION.  In order to enable the Warrant Agent
to provide services in accordance with the terms of this Agreement,  the Company
shall  provide  10  days  prior  written  notice  to the  Warrant  Agent  of any
anticipated  redemption.  Upon  notice  from the  Company,  Warrant  Agent shall
deliver the Notice of Redemption to all Warrant  Holders to be redeemed at least
30 days prior to the date  established for redemption (the  "Redemption  Date").
Each  Notice  of  Redemption  shall  (a)  specify  the  Redemption  Date and the
Redemption Price; (b) state that payment of the Redemption Price will be made by
the Warrant  Agent upon  presentation  and surrender to the Warrant Agent at its
principal office of the Warrant  Certificates  (as defined herein)  representing
the Redeemable Warrants to be redeemed by the Company; (c) state that the rights
to exercise the Redeemable  Warrants shall  terminate at 5:00 p.m. New York time
on the fifth  business day preceding the  Redemption  Date; and (d) if less than
all of the Redeemable Warrants then outstanding are to be redeemed,  specify the
serial  numbers or  portions  of the  Redeemable  Warrants to be redeemed by the
Company.

                  c. PAYMENT OF REDEMPTION  PRICE. On or prior to the opening of
business on the Redemption Date, the Company will deposit with the Warrant Agent
cash, or an irrevocable  letter or credit issued by a national or state bank and
in a form reasonably  satisfactory to the Warrant Agent, sufficient in amount to
redeem  all of the  Redeemable  Warrants  stated in the  Notice  of  Redemption.
Payment  of the  Redemption  Price  shall  be made  by the  Warrant  Agent  upon
presentation  and  surrender  of  the  Warrant  Certificates   representing  the
Redeemable Warrants to be redeemed to the Warrant Agent at its principal office.
If the Notice of Redemption  shall have been duly given and if the Company shall
have duly  deposited  with the Warrant Agent the cash or  irrevocable  letter of
credit  required by this  Section 5c, any  Redeemable  Warrants  subject to such
Notice of Redemption  not exercised by 5:00 p.m. New York time on the Redemption
Date shall no longer be deemed to be outstanding, and all rights with respect to
such  Redeemable  Warrants  shall  from and after  such time and date  cease and
terminate.  Notwithstanding  the foregoing,  however,  the Warrant Holders shall
retain the right to receive the Redemption Price, without interest.

         6.  CERTIFICATES.  The Redeemable  Warrants shall be in registered form
only and shall be evidenced by a warrant certificate (the "Warrant Certificate")
substantially  in the form set forth as Exhibit A hereto.  Warrant  Certificates
shall be signed by, or shall bear the facsimile signature of, the President or a
Vice President of the Company and the Secretary or an Assistant Secretary of the
Company and shall bear a  facsimile  of the  Company's  corporate  seal.  If any
person,  whose facsimile  signature has been placed upon any Warrant Certificate
as the  signature  of an officer of the  Company,  shall have  ceased to be such
officer before such Warrant Certificate is countersigned,  issued and delivered,
such Warrant  Certificate shall be countersigned,  issued and delivered with the
same  effect as if such  person had not ceased to be such  officer.  Any Warrant
Certificate  may be signed by, or made to bear the  facsimile  signature of, any
person who at the actual date of the  preparation  of such  Warrant  Certificate
shall be a proper officer of the Company to sign such Warrant Certificate,  even
though such person was not such an officer upon the date of this Agreement.


                                       2




         7. COUNTERSIGNING. Warrant Certificates shall be manually countersigned
by the  Warrant  Agent  and  shall  not be  valid  for  any  purpose  unless  so
countersigned. The Warrant Agent is hereby authorized to countersign any Warrant
Certificate which is properly issued and to deliver such Warrant  Certificate in
accordance with the instructions of the appropriate Warrant Holder.

         8. REGISTRATION OF TRANSFER AND EXCHANGES.

                  a. Warrant  Certificates  may be exchanged  for other  Warrant
Certificates  representing an equal aggregate  number of Redeemable  Warrants or
may be transferred  in whole or in part.  The Warrant Agent shall,  from time to
time,  register the transfer of outstanding  Warrant  Certificates  upon records
maintained  by the Warrant  Agent for such purpose  upon  surrender of a Warrant
Certificate  to the  Warrant  Agent for  transfer,  accompanied  by  appropriate
instruments  of transfer in a form  satisfactory  to the Company and the Warrant
Agent. Upon any such  registration of transfer,  the Warrant Agent shall issue a
new Warrant Certificate in the name of and to the transferee.  The Warrant Agent
shall then cancel the surrendered Warrant Certificate.

         9. EXERCISE OF THE REDEEMABLE WARRANTS.

                  a. Any Redeemable  Warrant evidenced by a Warrant  Certificate
may be  exercised  on or  after  the  Commencement  Date  and on or  before  the
Expiration  Date.  A Warrant  Holder may  exercise a  Redeemable  Warrant by (i)
surrendering the Warrant Certificate to the Warrant Agent with the exercise form
on the reverse of such Warrant  Certificate  fully completed and (ii) delivering
the Exercise Price for each share of Common Stock to be purchased to the Warrant
Agent by a  cashier's  check or  certified  funds  payable  to the  order of the
Company.

                  b. Upon  receipt of a Warrant  Certificate  with the  exercise
form thereon duly executed and full payment of the Exercise  Price,  the Warrant
Agent shall  requisition the  appropriate  number of shares of Common Stock from
the  Company's   transfer   agent,   and  upon  receipt  thereof  shall  deliver
certificates  evidencing  the total  number of shares of Common  Stock for which
Redeemable  Warrants are then being exercised in such names and denominations as
are required for delivery to, or in  accordance  with the  instructions  of, the
Warrant Holder.  The certificates for the shares of Common Stock shall be deemed
to be issued,  and the  person  for whom the  shares of Common  Stock are issued
shall be deemed to have become a holder of record of such shares, as of the date
of the surrender of the Warrant  Certificate  and payment of the Exercise Price,
whichever shall last occur.

                  c. If less than all the  Redeemable  Warrants  evidenced  by a
Warrant  Certificate  are exercised  upon a single  occasion,  the Warrant Agent
shall issue a new Warrant  Certificate  to the Warrant Holder for the balance of
the  Redeemable  Warrants not so exercised.  The Warrant Agent shall deliver the
Warrant Certificate to, or in accordance with the transfer instructions properly
given by, the Warrant Holder prior the Expiration Date.


                                       3



                  d. The  Warrant  Agent shall  cancel all Warrant  Certificates
surrendered upon exercise of the Redeemable Warrants.

                  e. Upon the  exercise  of a  Redeemable  Warrant,  the Warrant
Agent shall  promptly  deposit the payment of the Exercise  Price into an escrow
account  established by mutual agreement of the Company and the Warrant Agent at
a federally  insured  commercial bank. All funds deposited in the escrow account
will be  disbursed  on a  weekly  basis  to the  Company  once  they  have  been
determined  by the Warrant Agent to be collected  funds.  Once the Warrant Agent
has  determined  the funds to be  collected,  the Warrant  Agent shall cause the
Common Stock certificate(s) representing the exercised Redeemable Warrants to be
issued to an exercising Warrant Holder.

                  f. Reasonable  expenses  incurred by the Warrant Agent will be
paid  by the  Company.  These  expenses,  including  delivery  of  Common  Stock
certificates to the Company's  shareholders,  will be deducted from the Exercise
Price  submitted by an exercising  Warrant Holder prior to  distribution of such
funds to the Company. A detailed accounting  statement relating to the number of
shares of Common Stock issued,  names of registered  Warrant Holders and the net
amount of exercised funds remitted will be given to the Company with the payment
of each Exercise Price.

                  g. At the time of the exercise of the Redeemable Warrants, the
Company shall pay the transfer fee  associated  with the  exercise.  The Warrant
Agent's fee schedule is attached as Exhibit B hereto.

                  h. The Company covenants that if any securities to be reserved
for the  purpose  of  exercise  of the  Redeemable  Warrants  hereunder  require
registration with, or approval of, any governmental  authority under any federal
securities  law before such  securities  may be validly issued or delivered upon
such exercise,  the Company will file a registration statement under the federal
securities laws or a post-effective amendment, use its best efforts to cause the
same to become  effective  and use its best  efforts  to keep such  registration
statement  current  while any of the  Redeemable  Warrants are  outstanding.  In
addition,  the Company shall deliver a prospectus which complies with Section 10
of the Securities Act of 1933, as amended,  to the Warrant Holder exercising the
Redeemable  Warrant (except,  if in the opinion of counsel to the Company,  such
registration is not required under the federal securities laws or if the Company
receives  a  no-action  letter  from the staff of the  Securities  and  Exchange
Commission  stating that the staff would not recommend any enforcement action if
registration  is not effected).  The Company will use its best efforts to obtain
appropriate  approvals or registrations  under state "blue sky" securities laws,
if applicable. With respect to any such securities, however, Redeemable Warrants
may not be exercised by, or shares of Common Stock issued to, any Warrant Holder
in any state in which such exercise would be unlawful.

         10. TAXES.  The Company will pay all taxes  attributable to the initial
issuance of the shares of Common Stock upon exercise of the Redeemable Warrants.
The Company shall not, however,  be required to pay any tax which may be payable
in respect to any transfer  involved


                                       4




in the issuance of Warrant  Certificates or in the issuance of any  certificates
of shares of Common Stock in the name other than that of the Warrant Holder upon
the exercise of a Redeemable Warrant.

         11.  MUTILATED  OR  MISSING  WARRANT   CERTIFICATES.   If  any  Warrant
Certificate is mutilated, lost, stolen or destroyed, the Company and the Warrant
Agent may, on such terms as to  indemnity or otherwise as they may in their sole
discretion impose (which shall, in the case of a mutilated Warrant  Certificate,
include the surrender thereof), and upon receipt of evidence satisfactory to the
Company and the Warrant Agent of such  mutilation,  loss,  theft or destruction,
issue a substitute  Warrant  Certificate  of like  denomination  or tenor as the
Warrant  Certificate  so mutilated,  lost,  stolen or destroyed.  Applicants for
substitute  Warrant   Certificates  shall  comply  with  such  other  reasonable
regulations and pay any reasonable  charges the Company or the Warrant Agent may
prescribe.

         12.  RESERVATION OF SHARES.  For the purpose of enabling the Company to
satisfy all  obligations  to issue shares of Common  Stock upon  exercise of the
Redeemable  Warrants,  the Company will at all times reserve and keep  available
free from preemptive rights, out of the aggregate of its authorized but unissued
shares of Common  Stock,  the full number of shares which may be issued upon the
exercise of the Redeemable Warrants. These shares will, upon issue in accordance
herewith,  be fully  paid and  nonassessable  by the  Company  and free from all
taxes,  liens,  charges and  security  interests  with  respect to the  issuance
thereof.

         13. GOVERNMENTAL  RESTRICTIONS.  If any shares of Common Stock issuable
upon the exercise of the Redeemable Warrants require registration or approval of
any   governmental   authority,   the  Company  will  endeavor  to  secure  such
registration or approval;  provided that in no event shall the shares be issued,
and the  Company  shall  have the  authority  to  suspend  the  exercise  of all
Redeemable  Warrants,  until  such  registration  or  approval  shall  have been
obtained. All Redeemable Warrants, the exercise of which is requested during any
such suspension,  shall be exercisable at the Exercise Price. If any such period
of suspension continues past the Expiration Date, all Redeemable  Warrants,  the
exercise of which have been requested on or prior to the Expiration  Date, shall
be exercisable  upon the removal of such suspension  until the close of business
on the business day immediately following the expiration of such suspension.

         14. ADJUSTMENTS.  If, prior to the exercise of any Redeemable Warrants,
the Company  shall have effected one or more stock  splits,  stock  dividends or
other  increases  or  reductions  of  the  number  of  shares  of  Common  Stock
outstanding  without  receiving  compensation  therefor  in money,  services  or
property,  the  number  of  shares of Common  Stock  subject  to the  Redeemable
Warrants  granted  shall (i) if a net increase  shall have been  effected in the
number of outstanding shares of Common Stock, be proportionately  increased, and
the cash consideration  payable per share shall be proportionately  reduced,  or
(ii) if a net reduction  shall have been  effected in the number of  outstanding
shares of Common Stock, be  proportionately  reduced and the cash  consideration
payable per share be proportionately increased.


                                       5



         15.  NOTICE TO WARRANT  HOLDERS.  Upon any  adjustment  as described in
Section 14, the Company shall,  within 20 days  thereafter (i) cause to be filed
with the Warrant Agent a certificate  signed by a Company  officer setting forth
the details of such  adjustment,  the method of  calculation  and the facts upon
which such calculation is based, which certificate shall be conclusive  evidence
of the  correctness  of the matters set forth  therein,  and (ii) cause  written
notice of such  adjustments  to be given to each Warrant Holder as of the record
date applicable to such adjustment.  Also, if the Company proposes to enter into
any reorganization,  reclassification,  sale of substantially all of its assets,
consolidation, merger, dissolution, liquidation or winding up, the Company shall
give notice of such fact to all  Warrant  Holders at least 20 days prior to such
action, and such notice shall set forth sufficient factual information necessary
to indicate the effect of such action (to the extent such effect may be known at
the date of such  notice) on the  Exercise  Price and the kind and amount of the
shares of Common Stock  deliverable  upon exercise of the  Redeemable  Warrants.
Without  limiting the  obligation of the Company  hereunder to provide notice to
each Warrant Holder,  failure of the Company to give notice shall not invalidate
any corporate action taken by the Company.

         16. NO FRACTIONAL WARRANTS OR SHARES. The Company shall not be required
to issue  fractions  of  Redeemable  Warrants  upon the  reissue  of  Redeemable
Warrants,  any  adjustments  as  described in Section 14 or  otherwise.  In lieu
thereof,  the  Company  shall round up or down to the  nearest  full  Redeemable
Warrant. If the total Redeemable  Warrants  surrendered by exercise would result
in the  issuance of a  fractional  share,  the Company  shall not be required to
issue a  fractional  share,  but rather the  Company  shall round up or down the
aggregate number of shares issuable to the nearest full share.

         17. RIGHTS OF WARRANT HOLDERS.  No Warrant Holder,  as such, shall have
any rights of a  shareholder  of the Company,  either at law or equity,  and the
rights of the Warrant  Holders,  as such, are limited to those rights  expressly
provided in this Agreement or in the Warrant  Certificates.  The Company and the
Warrant  Agent  may  treat  the  Warrant   Holder  in  respect  of  any  Warrant
Certificates as the absolute owner thereof for all purposes  notwithstanding any
notice to the contrary.

         18. WARRANT AGENT. The Company hereby appoints the Warrant Agent to act
as the  agent  of the  Company,  and  the  Warrant  Agent  hereby  accepts  such
appointment upon the following terms and conditions:

                  a.  Statements  contained in this Agreement and in the Warrant
Certificates  shall be taken as  statements  of the Company.  The Warrant  Agent
assumes no responsibility for the correctness of any of the same, except as such
describes  the Warrant  Agent or for action  taken or to be taken by the Warrant
Agent.

                  b. The Warrant Agent shall not be responsible  for any failure
of the Company to comply with any of the Company's  covenants  contained in this
Agreement or in the Warrant Certificates.


                                       6




                  c. The  Warrant  Agent may  consult  at any time with  counsel
satisfactory  to it (who may be counsel for the Company),  and the Warrant Agent
shall  incur no  liability  or  responsibility  to the Company or to any Warrant
Holder in respect of any action  taken,  suffered or omitted by it  hereunder in
good faith and in  accordance  with the  opinion or the advice of such  counsel,
provided the Warrant Agent shall have exercised reasonable care in the selection
and continued employment of such counsel.

                  d.  The   Warrant   Agent   shall   incur  no   liability   or
responsibility  to the Company or to any Warrant  Holder for any action taken in
reliance upon any notice,  resolution,  waiver, consent,  order,  certificate or
other paper,  document or instrument reasonably believed by it to be genuine and
to have been signed, sent or presented by the proper party or parties.

                  e. The  Company  agrees to pay to the  Warrant  Agent the fees
indicated on Exhibit B hereto, to reimburse the Warrant Agent for all reasonable
expenses, taxes (other than income taxes) and governmental charges and all other
charges of any kind in nature  incurred by the Warrant Agent in the execution of
this  Agreement and to indemnify the Warrant Agent and save it harmless  against
any and all liabilities,  including judgments,  costs and counsel fees, for this
Agreement, except as a result of the Warrant Agent's negligence or bad faith.

                  f. The Warrant Agent shall be under no obligation to institute
any  action,  suit or legal  proceeding  or to take any other  action  likely to
involve  expense unless the Company or one or more Warrant Holders shall furnish
the Warrant  Agent with  reasonable  security  and  indemnity  for any costs and
expenses  which may be incurred in  connection  with such action,  suit or legal
proceeding.  Notwithstanding  the foregoing,  however,  this provision shall not
effect the power of the Warrant  Agent to take such action as the Warrant  Agent
may consider proper, whether with or without any such security or indemnity. All
rights or action under this  Agreement or under any of the  Redeemable  Warrants
may be enforced  by the  Warrant  Agent  without  the  possession  of any of the
Warrant  Certificates  or the production  thereof at any trial or the proceeding
relative thereto. Any such action, suit or proceeding  instituted by the Warrant
Agent  shall be  brought  in its name as  Warrant  Agent,  and any  recovery  of
judgment  shall be for the  ratable  benefit  of the  Warrant  Holders  as their
respective rights or interest may appear.

                  g. The Warrant Agent and any shareholder, director, officer or
employee of the  Warrant  Agent may buy,  sell or deal in any of the  Redeemable
Warrants or other securities of the Company or become pecuniarily  interested in
any transaction in which the Company may be interested. In addition, the Warrant
Agent may contract  with or lend money to the Company or otherwise  act as fully
and freely as though it were not  Warrant  Agent under this  Agreement.  Nothing
herein shall  preclude the Warrant  Agent from acting in any other  capacity for
the Company or for any other legal entity.

         19.  SUCCESSOR  WARRANT AGENT.  Any corporation  into which the Warrant
Agent may be merged or  converted or with which it may be  consolidated,  or any
corporation 


                                       7





resulting  from any merger,  conversion  or  consolidation  to which the Warrant
Agent shall be a party,  or any  corporation  succeeding to the corporate  trust
business of the  Warrant  Agent,  shall be the  successor  to the Warrant  Agent
hereunder  without the  execution or filing of any paper or any further act of a
party or the  parties  hereto.  In any such event or if the name of the  Warrant
Agent  is  changed,   the  Warrant  Agent  or  such   successor  may  adopt  the
countersignature  of the original Warrant Agent and may countersign such Warrant
Certificates  either in the name of the predecessor Warrant Agent or in the name
of the successor Warrant Agent.

         20.  CHANGE OF  WARRANT  AGENT.  The  Warrant  Agent  may  resign or be
discharged  by the Company from its duties  under this  Agreement by the Warrant
Agent or the Company, as the case may be, giving notice in writing to the other,
and by giving a date on which such  resignation or discharge  shall take effect,
which notice shall be sent at least 30 days prior to the date so  specified.  If
the  Warrant  Agent  shall  resign,  be  discharged  or shall  otherwise  become
incapable of acting, the Company shall appoint a successor to the Warrant Agent.
If the Company  shall fail to make such  appointment  within a period of 30 days
after it has been notified in writing of such  resignation  or incapacity by the
resigning  or  incapacitated  Warrant  Agent or by any  Warrant  Holder or after
discharging  the Warrant  Agent,  any Warrant  Holder may apply to the  District
Court for Denver  County,  Colorado,  for the  appointment of a successor to the
Warrant Agent.  Pending  appointment of a successor to the Warrant Agent, either
by the  Company or by such  court,  the  duties of the  Warrant  Agent  shall be
carried out by the Company.  Any successor  Warrant Agent,  whether appointed by
the  Company  or by such  court,  shall  be a bank or a trust  company,  in good
standing, organized under the laws of the Untied States of America and having at
the time of its appointment as Warrant Agent, a combined  capital and surplus of
at least four million dollars.  After  appointment,  the successor Warrant Agent
shall be vested with the same powers,  rights, duties and responsibilities as if
it had been  originally  named as Warrant Agent without further act or deed, and
the former  Warrant Agent shall  deliver and transfer to the  successor  Warrant
Agent any  property at the time held by it  thereunder,  and execute and deliver
any further  assurance,  conveyance,  act or deed  necessary  for  effecting the
delivery or transfer.  Failure to give any notice  provided for in this section,
however, or any defect therein, shall not affect the legality or validity of the
resignation or removal of the Warrant Agent or the  appointment of the successor
Warrant Agent, as the case may be.

         21.  NOTICES.  Any notice or demand  authorized by this Agreement to be
given or made by the Warrant Agent or by any Warrant Holder to or on the Company
shall be sufficiently  given or made if sent by mail, first class,  certified or
registered,  postage  prepaid,  addressed  (until  another  address  is filed in
writing by the Company with the Warrant Agent), as follows:

                              PerArdua Corporation
                      10940 Wilshire Boulevard, Suite 1600
                          Los Angeles, California 90024
                                 Attn: President



                                       8



Any notice or demand  authorized  by this  Agreement  to be given or made by any
Warrant  Holder  or  by  the  Company  to or  on  the  Warrant  Agent  shall  be
sufficiently  given  or  made  if  sent  by  mail,  first  class,  certified  or
registered,  postage  prepaid,  addressed  (until  another  address  is filed in
writing by the Warrant Agent with the Company), as follows:


                   American Securities Transfer & Trust, Inc.
                         1825 Lawrence Street, Suite 444
                           Denver, Colorado 80202-1817

Any  distribution,  notice or demand required or authorized by this Agreement to
be given  or made by the  Company  or the  Warrant  Agent  to or on the  Warrant
Holders  shall be  sufficiently  given or made on the day of  mailing if sent by
mail, first class,  certified or registered,  postage prepaid,  addressed to the
Warrant  Holders  at their  last known  addresses  as they  shall  appear on the
registration books for the Warrant Certificates maintained by the Warrant Agent.

         22. SUPPLEMENTS AND AMENDMENTS.  The Company and the Warrant Agent may,
from time to time,  supplement or amend this  Agreement  without the approval of
any Warrant  Holders in order to cure any  ambiguity or to correct or supplement
any provision  contained herein which may be defective or inconsistent  with any
other provisions herein, or to make any other provisions in regard to matters or
questions  arising  hereunder  which the Company and the Warrant  Agent may deem
necessary or desirable.

         23.  SUCCESSORS.  All the covenants and provisions of this Agreement by
or for the benefit of the  Company or the Warrant  Agent shall bind and inure to
the benefit of their respective successors and assignees hereunder.

         24.  TERMINATION.  This  Agreement  shall  terminate  at the  close  of
business on the  Expiration  Date or such earlier date upon which all Redeemable
Warrants  have  been  exercised;  provided,  however,  that if  exercise  of the
Redeemable  Warrants is  suspended  pursuant  to Section 13 and such  suspension
continues past the Expiration  Date, this Agreement shall terminate at the close
of  business  on the  business  day  immediately  following  expiration  of such
suspension. The provisions of Section 18 shall survive such termination.

         25. GOVERNING LAW. This Agreement and each Warrant  Certificate  issued
hereunder  shall be deemed to be a contract  make under the laws of the State of
Colorado and for all purposes and shall be construed in accordance with the laws
of said state.

         26.  BENEFITS OF THIS  AGREEMENT.  Nothing in this  Agreement  shall be
construed to give any person or corporation other than the Company,  the Warrant
Agent and the Warrant  Holders  any legal or  equitable  right,  remedy or claim
under this Agreement. This Agreement shall be for the sole and exclusive benefit
of the Company, the Warrant Agent and the Warrant Holders.


                                       9



         27.  COUNTERPARTS.  This  Agreement  may be  executed  in any number of
counterparts,  each of such counterparts  shall for all purposes be deemed to be
an original and all such counterparts shall together  constitute but one and the
same instrument.


                                       10





Effective Date: __________ , 1997

                                                 PERARDUA CORPORATION

                                                 By:
                                                    ------------------------
                                                 Its:
                                                     -----------------------
                                                 Date:
                                                      ----------------------



                                                 AMERICAN SECURITIES TRANSFER &
                                                   TRUST, INC.

                                                 By:
                                                    ------------------------
                                                 Its:
                                                     -----------------------
                                                 Date:
                                                      ----------------------




                                       11





                               WARRANT CERTIFICATE

    THIS WARRANT EXPIRES AT 5:00 P.M., NEW YORK TIME, ON ___________ , 2002


NUMBER                                                                  WARRANTS

W                                                              CUSIP 713603 11 6





          REDEEMABLE WARRANT CERTIFICATE FOR PURCHASE OF COMMON STOCK

                              PERARDUA CORPORATION

This certifies that FOR VALUE RECEIVED





or registered assigns




(the  ``Registered  Holder'') is the owner of the number of Redeemable  Warrants
(``Warrants'')  specified above. Each Warrant initially  entitles the Registered
Holder  to  purchase  subject  to the  terms  and  conditions  set forth in this
Certificate and the Warrant Agreement (as hereinafter  defined),  one fully paid
and   nonassessable   share  of  Common  Stock,  $.01  par  value,  of  PerArdua
Corporation, a Delaware corporation (the ``Company''),  at any time between June
28,  1998  through  June  28,  2002  (the  ``Last  Exercise  Date''),  upon  the
presentation  and surrender of this Warrant  Certificate  with the  Subscription
Form on the reverse  hereof duly executed,  at the corporate  office of American
Securities  Transfer & Trust Company as Warrant  Agent,  or its  successor  (the
``Warrant Agent''),  accompanied by payment of $6.50 (the ``Purchase Price'') in
lawful  money of the United  States of America  in cash or by  official  bank or
certified check made payable to the order of the Company.

     This Warrant  Certificate  and each Warrant  represented  hereby are issued
pursuant to and are  subject in all  respects  to the terms and  conditions  set
forth in the Warrant Agreement (the ``Warrant Agreement''), dated June 28, 1997,
by and between the Company and the Warrant Agent.

     In  the  event  of  certain  contingencies  provided  for  in  the  Warrant
Agreement, the Purchase Price or the number of shares of Common Stock subject to
purchase  upon the  exercise of each Warrant  represented  hereby are subject to
modification or adjustment.

     Each  Warrant  represented  hereby  is  exercisable  at the  option  of the
Registered  Holder,  but no fractional shares of Common Stock will be issued. In
the case of the exercise of less than all the Warrants  represented  hereby, the
Company  shall cancel this Warrant  Certificate  upon the  surrender  hereof and
shall execute and deliver a new Warrant  Certificate or Warrant  Certificates of
like tenor, which the Warrant Agent shall  countersign,  for the balance of such
Warrants.

     The term "Expiration Date" shall mean 5:00 p.m. (New York time) on the Last
Exercise Date, or such earlier date as the Warrants  shall be redeemed.  If such
date shall in the State of New York be a holiday or a day on which the banks are
authorized  to close,  then the  Expiration  Date shall mean 5:00 p.m. (New York
time) the next  following day which in the State of New York is not a holiday or
a day on which banks are authorized to close.

     The Company  shall not be obligated to deliver any  securities  pursuant to
the exercise of the Warrants  represented by this Warrant  Certificate  unless a
registration  statement  under the  Securities  Act of 1933,  as  amended,  with
respect to such  securities is effective.  The Company has covenanted and agreed
that it will file post effective amendments to the registration statement (which
events require such  amendments)  and cause the same to become  effective and to
keep such registration  statement current. The Warrants represented hereby shall
not be exercisable by a Registered Holder in any state where such exercise would
be unlawful.

     This Warrant Certificate is exchangeable,  upon the surrender hereof by the
Registered  Holder at the  corporate  office  of the  Warrant  Agent,  for a new
Warrant Certificate or Warrant  Certificates of like tenor representing an equal
aggregate number of Warrants, each of such new Warrant Certificates to represent
such number of Warrants as shall be designated by such Registered  Holder at the
time of such surrender. Upon due presentment together with any service charge in
addition  to  any  tax  or  other  governmental  charge  imposed  in  connection
therewith,  for  registration  or transfer of this Warrant  Certificate  at such
office, a new Warrant Certificate or Warrant Certificates  representing an equal
aggregate  number  of  Warrants  will be issued to the  transferee  in  exchange
therefor, subject to the limitations provided in the Warrant Agreement.

     Prior to the exercise of any Warrant  represented  hereby,  the  Registered
Holder  shall not be entitled  to any rights of a  shareholder  of the  Company,
including,  without  limitation,  the right to vote or to receive  dividends  or
other  distributions,  and shall not be  entitled  to receive  any notice of any
proceedings of the Company, except as provided in the Warrant Agreement.

     Warrants  represented  by this Warrant  Certificate  may be redeemed at the
option of the Company,  on or after June 21, 1998, at a redemption price of $.20
per Warrant,  provided the average  closing bid price (as defined in the Warrant
Agreement)  for the Common Stock  issuable  upon  exercise of such Warrant is at
least $9.00 per share for a twenty consecutive  trading day period ending within
10 days prior to the date on which the notice of redemption is given.  Notice of
redemption  shall be given at least  thirty  days  prior to the date  fixed  for
redemption as provided in the Warrant Agreement. On and after the date fixed for
redemption,  the  Registered  Holder  shall have no rights  with  respect to the
Warrants  represented by this Warrant Certificate except to receive the $.20 per
Warrant upon surrender of this Certificate.

     Prior to due presentment for registration of transfer  hereof,  the Company
and the Warrant Agent may deem and treat the  Registered  Holder as the absolute
owner  hereof  and of  each  Warrant  represented  hereby  (notwithstanding  any
notations  of  ownership  or  writing  hereon  made by anyone  other than a duly
authorized  officer of the Company or the Warrant  Agent) for all  purposes  and
shall not be affected by any notice to the contrary.

     This Warrant  Certificate  shall be governed by and construed in accordance
with the laws of the State of New York.

     This Warrant  Certificate is not valid unless  countersigned by the Warrant
Agent.

     IN WITNESS WHEREOF,  the Company has caused this Warrant  Certificate to be
duly  executed,  manually or in facsimile by two of its officers  thereunto duly
authorized and a facsimile of its corporate seal to be imprinted hereon.



Dated:                                                      PERARDUA CORPORATION


By                                                          By


/s/ Samuel P. Sears, Jr.

Secretary                                                   President

                                 CORPORATE SEAL






COUNTERSIGNED AND REGISTERED:

American Securities Transfer & Trust, Inc.
P.O. Box 1596
Denver, Colorado 80201

By   ____________________________________
     Transfer Agent Authorized Signature



                               SUBSCRIPTION FORM

                    To Be Executed by the Registered Holder
                         in Order to Exercise Warrants

     The undersigned  Registered  Holder hereby  irrevocably  elects to exercise
_______________  Warrants  represented  by  this  Warrant  Certificate,  and  to
purchase  the  securities  issuable  upon the  exercise  of such  Warrants,  and
requests that  certificates  for such securities  shall be issued in the name of
________________



PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE

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

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

- --------------------------------------------------------------------------------
                    (please print or type name and address)

and be delivered to

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

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

- --------------------------------------------------------------------------------
                    (please print or type name and address)

and if such number of Warrants  shall not be all the Warrants  evidenced by this
Warrant  Certificate,  that a new  Warrant  Certificate  for the balance of such
Warrants be registered in the name of, and delivered to, the  Registered  Holder
at the address stated below.


                                   ASSIGNMENT

                    To Be Executed by the Registered Holder
                          in Order to Assign Warrants

FOR VALUE RECEIVED,  _________________________________  the  undersigned  hereby
sells, assigns and transfers unto



PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE


   

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

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

- --------------------------------------------------------------------------------
                    (please print or type name and address)

 
- --------------------------------------------------------------------------------
of the Warrants represented by this Warrant Certificate, and hereby irrevocably
constitutes and appoints

______________________________________________________________________  Attorney
to transfer  this Warrant  Certificate  on the books of the  Company,  with full
power of substitution in the premises.


Dated:  __________________________     X  ___________________________________
                                                   Signature Guaranteed

                                          ___________________________________
 

THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION  FORM MUST CORRESPOND TO THE
NAME AS WRITTEN UPON THE FACE OF THIS  REDEEMABLE  WARRANT  CERTIFICATE IN EVERY
PARTICULAR WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER,  AND MUST
BE GUARANTEED BY AN ELIGIBLE  INSTITUTION  (AS DEFINED IN RULE 17Ad-15 UNDER THE
SECURITIES  EXCHANGE  ACT OF 1934) WHICH MAY INCLUDE A  COMMERCIAL  BANK,  TRUST
COMPANY OR SAVINGS  ASSOCIATION,  CREDIT  UNION OR MEMBER  FIRM OF THE  AMERICAN
STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR MIDWEST STOCK
EXCHANGE.



                                                                     EXHIBIT 5.1



                                  April 1, 1997



PerArdua Corporation
10940 Wilshire Boulevard
Suite 1600
Los Angeles, California  90024


Ladies and Gentlemen:

         We  have  acted  as  counsel  to  PerArdua   Corporation,   a  Delaware
corporation  (the  "Company"),  in connection with the preparation and filing of
the Company's  registration  statement on Form SB-2  (Registration No. 333-2129)
and all amendments thereto (the "Registration  Statement"),  as originally filed
with  the  Securities   and  Exchange   Commission  on  February  5,  1997.  The
Registration  Statement  relates to the  offering of (i)  1,000,000  shares (the
"Issuance  Shares")  of the  Company's  common  stock,  $.01 par value per share
("Common Stock"), (ii) 1,000,000 Redeemable Warrants (the "Redeemable Warrants")
to be sold by  certain  underwriters  (the  "Underwriters")  for whom  Schneider
Securities,  Inc. is acting as representative (the  "Representative")  and (iii)
150,000 additional shares of Common Stock and/or 150,000  additional  Redeemable
Warrants which may be sold by the  Underwriters  to cover  over-allotments  (the
"Over-Allotment Securities"). In addition, the Registration Statement relates to
the issuance of a warrant (the "Representative's  Warrant")to the Representative
to purchase  up to 100,000  shares of Common  Stock  and/or  100,000  Redeemable
Warrants.

         In  connection  with this opinion,  we have  examined the  Registration
Statement and the prospectus  contained  therein,  the Company's  Certificate of
Incorporation,  the Company's  bylaws and the originals,  or copies certified to
our satisfaction, of such records, documents, certificates,  memoranda and other
instruments  as in our judgment are  necessary  or  appropriate  to enable us to
render the opinions expressed below (the  "Documents").  We are relying (without
any  independent  investigation  thereof)  upon the  truth and  accuracy  of the
statements,   covenants,   representations  and  warranties  set  forth  in  the
Documents.  In addition,  for all purposes of this opinion, we have assumed that
the  underwriting  agreement  pursuant to which all securities will be sold (the
"Underwriting  Agreement")  will be duly  executed and  delivered  and will be a
valid and binding agreement of the parties thereto in accordance with its terms.

         On the basis of the foregoing,  and in reliance thereon,  we are of the
opinion that:

         1.  (i)  The  Issuance   Shares,   the  Redeemable   Warrants  and  the
Over-Allotment  Securities,  if issued, (ii) the Representative's Warrant, (iii)
the Common Stock  underlying the  Redeemable  Warrants and (iv) the Common Stock
and/or  the  Redeemable   Warrants  underlying  the   Representative's   Warrant
(including the Common Stock  underlying the Redeemable  Warrants  underlying the
Representative's Warrant) have been duly authorized and upon the sale thereof in
accordance with the terms of the Underwriting Agreement, such securities will be
validly issued.

         2. The Issuance Shares and the Over-Allotment Securities (to the extent
such securities are in the form of Common Stock),  when sold to the Underwriters
in accordance with the terms of the Underwriting  Agreement,  will be fully paid
and non-assessable.

         3. The  shares  of  Common  Stock  issuable  upon the  exercise  of the
Redeemable   Warrants   (including  the  Redeemable   Warrants  subject  to  the
Representative's  Warrant),  when  issued upon the  exercise  of the  Redeemable
Warrants and the  Representative's  Warrant in  accordance  with the  respective
terms thereof, will be fully paid and non-assessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement  and  further  consent  to all  references  to us in the  Registration
Statement,  the prospectus contained therein and any further amendments thereto.
Subject to the foregoing sentence, however, this opinion is given as of the date
hereof solely for your benefit and may not be relied upon, circulated, quoted or
otherwise referred to for any purpose without our prior written consent.


                                         Very truly yours,


                                         LECLAIR RYAN,
                                         A Professional Corporation


                                         By:_________________________________

                                         Title:_______________________________





                           OPTION & LICENSE AGREEMENT


1. INTRODUCTION

     THIS   AGREEMENT  is  between  the   UNIVERSITY   OF  SOUTHERN   CALIFORNIA
(hereinafter USC), a California  nonprofit  corporation with its principal place
of business at University  Park,  Los Angeles,  California  90089,  and PerArdua
Investors,  L.P., a California limited partnership,  with its principal place of
business at One Embarcadero Center, Suite 1200, San Francisco, California 94111,
(hereinafter Licensee).

     WHEREAS  USC  warrants  that it is the  owner  and that it has the right to
exclusively license those inventions which are the subject matter of the patents
and patent  applications listed in Appendix A and of which the inventors are Dr.
Charles McKenna of USC (hereinafter Inventors);

     WHEREAS  Licensee  desires to obtain an  exclusive  license in the  defined
FIELD OF USE to  manufacture  and market  products  utilizing the  inventions as
hereinafter defined;

     WHEREAS,  USC is willing  to grant a  worldwide,  exclusive  license in the
defined FIELD OF USE to Licensee subject to the terms, conditions,  limitations,
and restrictions set forth below;

     NOW,  THEREFORE,  in consideration of the covanants herein  contained,  the
parties agree as follows:
 
2. DEFINITIONS

     For all  purposes  of this  Agreement  the  following  terms shall have the
meanings specified below:

     a. The term  "PATENT"  or  "PATENTS"  shall  mean any and all  patents  and
patents  applications listed in Appendix A (Appendix A may be added to from time
to time by USC and USC shall notify Licensee of any such additions), any and all
patents  issued  thereon or any  continuation,  division,  extensions or reissue
thereof,  and any and all foreign  patents  issuing from any  application  filed
which  corresponds  to  claims  contained  in any of the  foregoing  patents  or
applications.

     b. "PRODUCT" or "PRODUCTS" shall mean any article, composition,  apparatus,
substance,  chemical, material, method or service which is made, used or sold by
Licensee which:

         i. is  covered  in whole by one or more  pending  or  unexpired  claims
contained in a PATENT in the country in which the  PRODUCT(S)  is made,  used or
sold;





         ii. is manufactured using a method or process which is covered in whole
by one or more pending or unexpired  claims contained in a PATENT in the country
in which (a) the PRODUCT(S) is made, used, or sold, or (b) the method or process
is used, or sold;

         iii.  the use of which is  covered  in whole by one or more  pending or
unexpired  claims  contained  in a  PATENT  in the  country  in  which  (a)  the
PRODUCT(S) is made, used, or sold, or (b) the method or process is used or sold;

         iv.  incorporates  technology  transferred to Licensee  pursuant to the
confidential disclosure agreement dated November 1993 between USC and Licensee.

         A PRODUCT is covered by a pending or  unexpired claim of a PATENT if in
the  course of  manufacture,  use or sale,  it  would,  in the  absence  of this
Agreement,  infringe  one or more claims  of the PATENT  which has not been held
invalid by a court from which no appeal can be taken.

     c. "FIELD OF USE" shall mean the use of thiophosphonoformic acid (TPFA) and
derivatives  thereof for  treatment of infection  by  Cytomegalovirus  (CMV) and
other viral infections.

     d. "NET SALES  PRICE"  shall mean the gross  billing  price of any  PRODUCT
received  Licensee  or its  SUBLICENSEE  for  the  sale or  distribution  of any
PRODUCT, less the following amounts actually paid by Licensee or SUBLICENSEE:

         i. discounts allowed;

         ii. returns;

         iii. transportation charges or allowances

         iv. packing and  transportation  packing  material costs (not including
product  containers  or  product  packing  containers  as  manufactured  by  the
Company);

         v. customs and duties charges; and

         vi.sales, transfer and other excise taxes or other governmental charges
levied on or  measured by the sales but no  franchise  or income tax of any kind
whatsoever.

     Every  commercial use or disposition of any PRODUCT,  in addition to a bona
fide sale to a customer,  shall be  considered a sale of such a PRODUCT,  except
for promotional  distributions,  humanitarian uses which are uncompensated,  and
products  provided for testing of trial  purposes.  The NET SALES PRICE,  in the
case


                                      -2-



of a use or disposition  other than a bona fide sale, shall be equivalent to the
then payable NET SALES PRICE of such PRODUCT in an arm's length transaction.

     e.  "SUBLICENSEE"  shall mean any third party licensed by Licensee to make,
or sell any PRODUCT.

     f. "EFFECTIVE DATE" of this Agreement shall be the date when the last party
has signed this Agreement.

3. OPTION PHASE

     a. USC hereby grants Licensee the royalty-free  exclusive right to practice
the invention in PATENTS to conduct various technical, pre-clinical,  marketing,
patent,  and other  studies on  PRODUCTS  in the FIELD OF USE during an eighteen
(18) month period  commencing  on the EFFECTIVE  DATE.  The option period may be
extended by Licensee,  for an additional twelve (12) month period, if before the
end of the  original 18 month  period at least one of the  following  conditions
occur:

         i. Licensee provides  additional research support to USC in the minimum
amount of $50,000;

         ii. At least one patent  application  is filed by USC at the request of
Licensee under the terms of Paragraph 7;

         iii. Licensee pays to USC an option extension fee of $15,000.

     c. The  consideration  for the grant of this option phase shall be research
support in the amount of  $163,760.00  as evidenced  by a "Research  Agreement,"
attached  hereto as Appendix B, providing grant funds to USC for the development
of PRODUCTS.  To the extent that provisions of the Research  Agreement  conflict
with the terms herein, this Agreement shall control.

     d. All terms of this  Agreement  shall apply during the Option Phase unless
specifically stated to the contrary.

4. LICENSE PHASE

     a. In  consideration  of the license fee and royalties as set forth in this
Agreement and effective upon written notification to USC during the option phase
that Licensee desires to license the PATENT(S), USC hereby grants to Licensee:

         i.  the  exclusive   worldwide  license  to  practice  the  PATENTS  to
manufacture and sell the PRODUCT(S) in the FIELD OF USE; and


                                      -3-




         ii. the right to grant  sublicenses to any PATENT licensed  exclusively
hereunder  provided  that any  SUBLICENSEE  agrees  to be bound by the terms and
conditions of this Agreement applicable to SUBLICENSEES.

     b. If USC is not notified of  Licensee's  desire to enter the license phase
by the end of the option phase or any extensions thereto, this Agreement and the
license  granted  herein shall  immediatly  terminate.  Payments  referred to in
Section 3 shall not be refunded upon such termination.

     c. All licenses pursuant to 4.a. and 4.b. to inventions  conceived or first
actually  reduced to  practice  during the course of  research  funded by a U.S.
federal agency are subject to the rights,  conditions and limitations imposed by
U.S. law. USC agrees to use reasonable  efforts to comply with the  requirements
of such laws and applicable  regulations.  The words "exclusive license" as used
herein shall mean exclusive  except for the royalty free  non-exclusive  license
granted to the U.S. government by USC pursuant to 35 USC Section 202 (c) (4) for
any PATENT  claiming an  invention  subject to 35 USC Section 201 and except for
the rights of USC and Inventors as set forth in Paragraphs 6 and 7.

     d. In addition to the royalty referred to in Paragraph 5 the Licensee shall
pay USC a license fee of  twenty-five  hundred dollars ($2,500),  payable within
five (5) days of the exercise of the option granted herein.

     e. To  become  effective  on the  date of  expiration  of the  term of this
Agreement, USC hereby grants Licensee an exclusive, paidup, worldwide license to
use the  technology  and all know-how in Licensee's  possession  relating to the
manufacture of PRODUCTS in the FIELD OF USE.

5. ROYALTY 

     a. On all sales of  PRODUCTS  anywhere in the world by  Licensee,  Licensee
shall pay USC a royalty of four percent (4%) of the NET SALES PRICE. This earned
royalty rate shall apply only to the initial Licensee, PerArdua. On all sales of
PRODUCTS    anywhere    in   the    world   by   any    assignee,    transferee,
successor-in-interest,  or other party  receiving all of  Licensee's  rights and
obligations  as  permitted  under this  agreement,  such  party  shall pay USC a
royalty of one percent (1%) of the NET SALES PRICE.

     b. If any  PRODUCT  is  manufactured  and sold  under  sublicense  from the
Licensee (or Licensee's transferee or assignee of this Agreement), the Licensee,
(or its  transferee  or assignee) shall pay USC a royalty equal to Fifty percent
(50%) of the Licensee's (or its transferee's or assignee's)  earned royalty from
the sublicense in lieu of the royalty specified in Paragraph 5a.


                                       -4-





     c. The Licensee will pay an annual minimum royalty.  The minimum royalty on
the PRODUCTS will be  Twenty-Five  Hundred  Dollars  ($2,500)  commencing on the
earlier  of the  second  year of sales or the  fourth  anniversary  date of this
agreement,  Five Thousand  Dollars  ($5,000) for the next  succeeding  year, Ten
Thousand  Dollars  ($10,000) for the following year, and thereafter  Twenty-Five
Thousand Dollars ($25,000) for each succeeding year up to the date of expiration
of the last PATENT. Minimum royalties are to be paid biannually to USC, one half
due and payable on January 1 of each year and the second half due and payable on
July 1 of each  year.  Should  Licensee  fail to make  earned  royalty  payments
sufficient to meet said minimum royalty requirements,  it may pay the difference
between the earned royalty requirement to keep this Agreement in force.

     d. The minimum royalty amounts listed above shall apply only to the initial
Licensee,   PerArdua.   The  minimum  royalty   requirement  for  the  assignee,
transferee,  successor-in-interest,  or other party  receiving all of Licensee's
rights and obligations as permitted under this Agreement shall be five times the
amounts  listed in Paragraph 5.c. The payments shall be due on the same dates as
required above.

     e. If it become desirable to engineer a PRODUCT into a complex with a drug,
toxin or other therapeutic agent, the royalty as defined in Paragraph 5a will be
applied,  but the net selling  price as defined in  Paragraphs 5b and 5c will be
based on the net sales  price of the  complex  minus the net sales  price of the
drug, toxin or therapeutic agent when sold alone.

     f. Licensee  shall pay such  royalties to USC on a calendar  quarter basis.
With each quarterly  payment,  Licensee shall deliver to USC a full and accurate
accounting to include at least the following information:

         i.  Quantity of each  PRODUCT  sold (by  country)  by Licensee  and its
SUBLICENSEES;

         ii. Total receipts for each PRODUCT (by country);

         iii. Quantities of each PRODUCT used by Licensee and its SUBLICENSEES;

         iv. Names and addresses of SUBLICENSEES of Licensee; and

         v. Total royalties payable to USC.

     g. In each year the amount of royalty due shall be calculated  quarterly as
of March 31, June 30,  September 30 and December 31 and shall be paid  quarterly
within the thirty next(30) days following such date. Every such payment shall be
supported by the accounting prescribed in paragraph 5.e. and


                                      -5-




shall be made in United States currency. Whenever for the purpose of calculating
royalties  conversion from foreign  currency shall be required,  such conversion
shall be at the rate of exchange thereafter published in the Wall Street Journal
for the business day closest to the applicable end of calendar quarter.

     h. The royalty payments due under this Agreeement  shall, if overdue,  bear
interest  until  payment  at a per annum  rate  equal to one and a half  percent
(1.5%) above the prime rate in effect at Bank of America, Los Angeles on the due
date, not to exceed the maximum  permitted by law. The payments of such interest
shall  not  preclude  USC from  exercising  any  other  rights  it may have as a
consequence of the lateness of any royalty payment.

6. RIGHTS RETAINED BY UNIVERSITY

     Notwithstanding  the  exclusive  license  granted in Paragraph  4a, USC and
Inventors  will have the absolute,  nontransferable  right to use the technology
covered by the PATENTS and all improvements thereof, in conducting research.

7. PATENT PROSECUTION

     a. USC shall  file,  prosecute  and  maintain,  during  the  course of this
Agreement,  the patent  applications  and  patents  listed in Appendix A. Should
Licensee  require the filing of foreign patents,  USC shall take  responsibility
for filing, prosecuting and maintaining said foreign patents.

     b.  Notwithstanding  the reimbursement  obligation of Licensee in Paragraph
7.c.  for expenses  incurred by USC prior to the  EFFECTIVE  DATE,  Licensee may
defer reimbursement to the following  dates: i) when Licensee assigns its rights
under  Paragraph  16 or ii)  when  Licensee  exercises  its  option  and takes a
license under this Agreement.  Notwithstanding,  all expenses  under  Paragraph
7.a.  incurred by USC before the EFFECTIVE  DATE shall be reimbursed by Licensee
within 60 days after USC files the first  U.S.  patent  application,  other than
those on file on the EFFECTIVE DATE,  covering the use of PRODUCT.  All expenses
under  Paragraph  7.a.  incurred  by USC  after  the  EFFECTIVE  DATE  shall  be
reimbursed by Licensee within 30 days of request by USC.

     c. Licensee shall reimburse all reasonable  legal expenses  incurred plus a
15%  administrative  fee on the expenses and paid by USC in filing,  prosecuting
and  maintaining  the U.S.  and  foreign  applications  listed  (or to be listed
pursuant to Paragraph  2a.) in Appendix A, whether such  expenses  were incurred
before or after the date of this  Agreement.  These legal expenses shall include
the attorneys' and agents' fees,  foreign  filing fees and  out-of-pocket  costs
associated  with  responding  to office  actions  and any  other  fees and costs
directly  related to  obtaining  and/or  maintaining  patent  protection  in the
countries


                                      -6-



listed in Appendix A. Licensee is not obligated to reimburse the legal  expenses
which were incurred prior to the EFFECTIVE DATE which exceed,  in total,  twelve
thousand nine hundred  dollars  ($12,900).  Licensee  shall advance  payments of
maintenance  fees and annuities as part of such legal  expenses to be reimbursed
by  Licensee  within 30 days of  request  by USC,  unless  Licensee  is  advised
otherwise by timely notice from USC.

     d. If the  Licensee  elects (i) not to pursue a PATENT or (ii) to terminate
the  prosecution  or  maintenance  of a  PATENT  in any  country,  the  Licensee
surrenders  its right to make, sue or sell PRODUCTS  covered by the  non-elected
PATENT in that  particular  country and shall grant to USC the exclusive  rights
previously granted to Licensee,  without limitation,  for that country. Licensee
agrees to execute all  necessary  documents to carry out this grant of rights to
USC. Payments referred to in Paragraphs 7.a. and 7.b. shall not be refunded upon
such non-election or termination.

8. IMPROVEMENTS

     Should Inventors or any successor, conceive substantial improvements to the
technology, whether patentable or not, during the course of this Agreement which
are not covered by a PATENT,  USC will inform the  Licensee of said  substantial
improvements  and  offer  the right of first  refusal  to  obtain an option  and
license for such  invention on the same terms as those set forth herein,  except
that no additional  option or license fees are due,  which right of refusal,  if
not  accepted  within 60 days,  will be deemed to be rejected.  Thereafter,  USC
shall be free to offer a corresponding option and license to any other party. If
there is any subsequent  modification of those terms,  USC shall notify Licensee
of such  modification  in writing  and again to offer  Licensee a right of first
refusal.  Any  resubmission  to Licensee based upon a modification  of the terms
initially  offered to Licensee shall be deemed to be rejected if not accepted in
writing within twenty (20) days. Nothing in this Agreement shall be construed to
give Licensee a royalty-free license to these substantial improvements.

9. PATENT INFRINGEMENT

     a. Defensive  Controversy 

     Except for the placing in escrow of a portion of  royalties  as referred to
hereinafter,  USC shall have no  obligation or liability in the event that legal
action is brought against Licensee for patent  infringement.  License may choose
legal counsel and defend the patent infringement  lawsuit.  During such lawsuit,
Licensee may place all of the royalties derived from sales of the PRODUCT in the
country where such lawsuit is pending in an interest-bearing escrow account. The
escrow

                                       -7-



     account shall be established in a bank mutually  acceptable to both parties
under escrow instructions insulating the funds from claims of any creditor. Upon
termination  of the action,  one-half (1/2) of any judgment  amount,  reasonable
attorneys'  fees and costs,  may be paid from this  escrow  account.  Should the
settlement of any such patent infringement  lawsuit involve payment of royalties
by Licensee to a third party for the continued  right to  manufacture,  use, and
sell the PRODUCT,  then funds in the escrow account and royalties payable to USC
may be applied  against up to one-half (1/2) of such royalties to a third party.
Any funds  thereafter  remaining  in the escrow  shall be paid to USC. The above
shall  constitute  USC's sole  liability in the event of such action.  Royalties
paid to third parties as provided for above shall be included  when  determining
whether the minimum  royalty  provided for in this  Agreement has been paid in a
given year.  During the patent  infringement  litigation both parties shall keep
each other informed in writing of significant developments in the lawsuit.

     b. Offensive Controversy.

     In the event that a third party infringes on a PRODUCT, Licensee shall have
the right but not an  obligation  to bring  legal  action  to  enforce  any such
patent.  If Licensee  exercises such right,  Licensee shall select legal counsel
and pay all legal fees and costs of  prosecution  of such  action.  In the event
that Licensee shall choose not to take such action, USC shall have the right, at
its option  and at its own  expense,  to  prosecute  any  action to enjoin  such
infringement  or to prosecute any claim for damages.  The party  prosecuting any
such  action  shall be  entitled  to retain  any funds  received  as a result of
settlement  or  judgment of such  action.  The parties may also agree to jointly
pursue  infringers.  After  deduction  and  payment  to  the  parties  of  their
respective  costs and fees incurred in  prosecuting  any such  actions,  the net
funds  obtained as a result of  settlement  or of  judgment of any such  jointly
prosecuted action shall be divided in the following manner: 25% of all net funds
shall be divided  equally by the  parties  and 75% of all the net funds shall be
divided  between the parties in the  proportion  to the amount of legal fees and
costs incurred by the parties in the  prosecution of such actions.  If funds are
insufficient  to pay all costs  and fees then all of the funds  shall be paid to
the parties in such proportion.

     c.  During any  litigation  hereunder  both  parties  shall keep each other
timely informed of any significant development in the litigation and provide all
reasonably requested non-monetary assistance.  During any said controversy, full
royalty payment shall continue, except as otherwise provided herein.


                                       -8-



10. RECORDS

     Licensee and SUBLICENSEES  shall keep complete,  true and accurate books of
account and records  for the  purpose of showing the  derivation  of all amounts
payable to USC under this Option and License  Agreement.  Said books and records
shall be kept at  Licensee's  principal  place of business for at least four (4)
years  following the end of the calendar year to which they pertain and shall be
open at all reasonable times for inspection by a  representative  of USC for the
purpose of verifying Licensee's royalties statement or Licensee's  compliance in
other respects with this Option and License Agreement.  All information obtained
as a result of such audit shall be maintained in confidence,  except during each
year, as determined in such audit.  Should an audit by USC show an  underpayment
of royalties by more than 10%, Licensees  shall pay for USC's  reasonable  audit
expenses.

11. SERVICES OF INVENTORS

     USC shall  make  reasonable  efforts  to make  Inventors  available  during
regular business hours to answer questions  concerning certain technical aspects
of the  technology.  Should Licensee desire to use the services of Inventors for
further testing and/or market studies of the technology, a separate research and
development and/or consulting  agreement should be negotiated with Inventors and
the USC Office of Contracts and Grants.

12. SUBLICENSE PERMISSION

     Licensee may sublicense  the PATENT(S)  only with prior written  permission
from USC, which permission will not be unreasonably withheld.


13. PATENT MARKING

     Licensee  shall use  reasonable  efforts  to place all  appropriate  patent
marking and  indicia on product and  marketing  literature  for the  PRODUCTS as
needed to  protect  the  patent of USC and right for  damages  for  infringement
thereof.

14. PUBLICATIONS

     Nothing in this  Agreement  shall  limit or prevent USC or  Investors  from
publishing  any  information  about  the  PATENT.  Thirty  (30)  days  prior  to
submission for publication,  USC and Inventors will use their reasonable efforts
to submit the proposed publication, for review only, to Licensee.


                                      -9-




15. PUBLICITY

     Neither party shall use the name, tradename, trademark or other designation
of the other party in  connection  with any products,  promotion or  advertising
without the prior written permission of the other party.


16. ASSIGNMENTS/TRANSFERS

     Licensee may not assign or transfer this  Agreement in whole or part to any
third party without the prior written  permission of USC, which permission shall
not be unreasonably  withheld. The Licensee may only assign the entire Agreement
to successors of the entire business of the PRODUCTS if the successor  agrees to
be bound by this  Agreement  and prior  written  notice is provided to USC. Upon
assignment or transfer of this Agreement by Licensee, Licensee agrees to pay USC
4% of the proceeds received by Licensee for such assignment or transfer.

17. TERMINATION

     a. Upon the breach of or default under this Option and License Agreement by
either party,  the  non-breaching  party may  terminate  this Option and License
Agreement by forty-five  (45) days written notice to the breaching  party.  Said
notice shall be effective  at the end of such period  unless  during said period
breaching party shall remedy such defect or default. Licensee may also terminate
this Agreement at any time, for any reason,  by providing USC a thirty (30) days
written notice. No option fees,  license fees, or royalties shall be returnable.
Upon  termination  of the  Agreement  all rights  granted to or provided by each
party to the other shall  automatically  and irrevocably  revert to the granting
party.

     b. Surviving any termination are:

            i.   Licensee's obligation to pay royalties accrued or accruable.

            ii.  Licensee's  obligation  of  Paragraph  10  to keep and follow a
                 final audit.

            iii. Any cause of  action or claim of Licensee or USC, accrued or to
                 accrue, because of any breach or default by the other party.

            iv.  The provisions of Paragraphs 23, 24 and 25.

18. NOTICES, REPORTS AND PAYMENTS

     Any notice,  report or payment  permitted or required  under this Agreement
shall be in writing, and shall be sent or


                                      -10-




delivered  to  the receiving party at the address as such party may from time to
time designate.

USC:          Officer of Patent and Copyright Administration
              University of Southern California
              3716 South Hope Street, Suite 313
              Los Angeles, California 90007-4344 (U.S.A.)

              Attn: Director


LICENSEE      PerArdua, Inc.
              One Embarcardero Center, Suite 1200
              San Francisco, California 94111

              Attn: Chief Executive Officer


19. PARAGRAPH HEADINGS

     Paragraph headings are for the convenience of this Agreement only and shall
not add to or detract from any of the terms or provisions.


20. SEVERABILITY

     If any provision of this Agreement is held invalid under any law applicable
to the parties,  SUBLICENSEES and assignees,  that provision shall be considered
severable and its invalidity  shall not affect the remainder of this  Agreement,
which shall continue in full force and effect.


21. CONTROLLING LAW, JURISDICTION AND VENUE

     This  Agreement  shall be deemed to be executed  and to be performed in the
State of California,  and shall be construed in accordance  with the laws of the
State of California  as to all matters,  including but not limited to matters of
validity, construction, effect and performance.


22. TERM OF THE AGREEMENT

     Except as otherwise  terminated  pursuant to the other  provisions  of this
OPTION AND LICENSE AGREEMENT,  this Agreement shall terminate upon expiration of
the last to expire of the patents or fifteen (15) years from the Effective  Date
of this Agreement, whichever is longer.


                                      -11-




23. NEGATION OF WARRANTIES

     a. Nothing in this Agreement shall be construed as:

           i.   a  warranty or representation by USC as to the validity or scope
                of the PATENT and/or PATENT Application; or 

           ii.  a warranty or representation  that any PRODUCTS made, used, sold
                or  otherwise  disposed  of under any  license  granted  in this
                Agreement  is or will be free from  infringement  of  patents of
                third parties; or

           iii. an  obligation  to bring or prosecute  actions or suits  against
                third parties for infringement; or

           iv.  conferring  the  rights  to use  in  advertising,  publicity  or
                otherwise   any   trademark,   trade  name,   or  names  or  any
                contraction,  abbreviation,  simulation or adoption thereof,  of
                USC or Licensee; or

           v.   any obligation to furnish any know-how not provided.


     b. USC MAKES NO EXPRESS OR IMPLIED WARRANTIES OR MERCHANTABILITY OR FITNESS
FOR A  PARTICULAR  PURPOSE,  nor does USC  represent  that  the  rights  granted
hereunder will result in PRODUCTS that are commercially successful.


     c. Licensee further agrees that it will not rely upon technical information
provided  by USC and  Inventors  in  developing  and  manufacturing any PRODUCTS
hereunder,  but will independently test, analyze and evaluate all PRODUCTS prior
to manufacture and distribution of such PRODUCTS.

24. INDEMNITY

     a. Licensee shall defend, indemnify and hold harmless USC and its trustees,
officers,  medical  and  professional  staff, employees  and  agents  and  their
respective  successors,  heirs and  assigns  (the  "Indemnitees"),  against  all
liability,  demand,  damage,  loss,  or expense  incurred by or imposed upon the
Indemnitees  or any one of them in connection  with any claims, suits,  actions,
demands or judgments  arising out of any theory of liability  (including but not
limited to,  actions in the form of tort,  warrantee,  or strict  liability) for
death, personal injury, illness, or property damage arising from Licensee's use,
sale, or other dispostion of the PRODUCTS(S).

     B. Licensee  agrees, at its own expense,  to provide  attorneys  reasonably
acceptable to USC to defend against any


                                      -12-





actions brought or filed against any party indemnified hereunder with respect to
the  subject  of  indemnity  contained  herein,  whether or not such actions are
rightfully brought.


25. INSURANCE

     a. Upon the execution of this Agreement Licensee shall at its sole cost and
expense, procure and maintain in effect a comprehensive general liability policy
of  insurance  in single  limit  coverage of not less than One  Million  Dollars
($1,000,000) per incident and One Million Dollars  ($1,000,000) annual aggregate
for death,  bodily injury or illness and Two Hundred thousand Dollars ($200,000)
annual  aggregate  in property  damage.  Such  comprehensive  general  liability
insurance  shall  provide (i)  product  liability  coverage  and (ii) broad form
contractual  liability  coverage  for  Licensee's  indemnification.  If Licensee
elects to  self-insure  all or part of the  limits  described  above  (including
deductibles or retention  which are in excess of $50,000 annual  aggregate) such
self-insurance  program must be acceptable to USC. Each such policy of insurance
shall name USC as an  additional  insured  and shall  provide  for not less than
thirty (30) days prior written notice before any cancellation or material change
in coverage  shall be effective.  A  Certificate  evidencing  the  comprehensive
general  liability  policy  herein  defined shall be delivered to USC within ten
(10) days of the EFFECTIVE DATE of this Agreement.  Licensee shall maintain such
comprehensive  general  liability  insurance  until  such time as the  policy in
Paragraph  25.5 is  procured,  or until  fifteen  years  after  the term of this
Agreement.


     b. During such time and in each country where PRODUCT,  or any modification
thereof,  is  administered  to humans,  manufactured or distributed for any such
purpose  (including  for the  purpose  of  obtaining  regulatory  approvals)  by
Licensee  or any  SUBLICENSEE,  Licensee  shall  at its sole  cost and  expense,
procure  and  maintain in effect a  comprehensive  general  liability  policy of
insurance  in  single  limit  coverage  of not  less  than Ten  Million  Dollars
($10,000,000)  per  incident  and  Ten  Million  Dollars   ($10,000,000)  annual
aggregate  for  death,   bodily  injury,   illness  or  property  damage.   Such
comprehensive  general  liability  insurance shall provide (i) product liability
coverage  and (ii) broad form  contractual  liability  coverage  for  Licensee's
indemnification.  If  Licensee  elects to  self-insure all or part of the limits
described  above (including  deductibles  or  retention  which are in  excess of
$250,000  annual  aggregate) such  self-insurance  program must be acceptable to
USC. Each such policy of insurance  shall name USC as an additional  insured and
shall provide for not less than thirty (30) days prior written notice before any
cancellation  or material  change in coverage shall be effective.  A Certificate
evidencing the  comprehensive  general  liability policy herein defined shall be
delivered to USC prior to any manufacture,  sale, distribution or administration
to humans. Licensee shall maintain such comprehensive general liability


                                      -13-



insurance  during the period  that the  PRODUCT or any  modification  thereof is
being manufactured, sold, distributed or administered to humans by  the Licensee
or its SUBLICENSEES and a reasonable  period  thereafter which in no event shall
be less than fifteen (15) years.

     c.  Alternatively,  Licensee and USC may obtain an independent opinion from
legal  counsel  mutually  agreeable  to the  parties  in each  country  in which
Licensee  intends to manufacture  and/or  distribute  PRODUCTS,  such opinion to
assist in  determining  the amount of general and products  liability  insurance
required to be carried by  Licensee in such  country.  Where  independent  legal
counsel  determines  that little or no  liability  risk to USC exists  under the
present and reasonably anticipated future legal trends in that country, Licensee
will be  required to  maintain  liability  insurance  on USC's  behalf  which is
determined by USC to be reasonably  adequate to pay  litigation  defense  costs.
Where  independent  legal counsel  determines  that the risk of liability on the
part of USC is more than minimal in that country, USC and Licensee will evaluate
such risk and  negotiate  in good faith to  determine  the amounts of  liability
insurance  necessary to reasonably  insure USC's interests.  If USC and Licensee
cannot  agree on the  amounts and types of  insurance  reasonably  necessary  to
protect USC's interest in a particular country, Licensee will not manufacture or
market the PRODUCTS in that country.

     d. In the event that  Licensee  does not maintain  such  insurance,  but is
self-insured, or carries a substantial self-retention,  USC may grant permission
for such  sublicense  only if, in the sole  discretion  of USC,  the net  worth,
assets and earnings of such  prospective  SUBLICENSEE  are deemed  sufficient to
protect USC's  economic  interests in the event of claims,  liability,  demands,
damages,  expenses and losses from, death, personal injury, illness, or property
damage.

     e. The minimum amounts of insurance  coverage required under this Paragraph
(subparts  25.1.,  25.b.  and 25.c.) shall not be construed to create a limit of
Licensee's liability with respect to its indemnification in Paragraph 24 of this
Agreement.

     f. BY SUBLICENSEES

     As a condition  precedent to a grant of  permission  by USC for Licensee to
sublicense the PATENT rights herein, the prospective  SUBLICENSEE shall agree to
indemnify  Licensee and USC to the same extent and degree as Licensee has agreed
to indemnify USC herein. Such SUBLICENSEE shall also provide insurance identical
in coverage and amount to that  required of Licensee in  subparagraph  a, above,
naming both Licensee and USC as additional insured. A Certificate evidencing the
comprehensive  general liability policy shall be delivered to USC prior to USC's
giving permission for such sublicensing  agreement and a Certificate  evidencing
the product  liability coverage shall be delivered prior to first manufacture of
any PRODUCTS by the SUBLICENSEE. In the event a 

                                      -14-




prospective  SUBLICENSEE does not maintain such insurance,  but is self-insured,
or  carries a  substantial  self-retention,  USC may grant  permission  for such
sublicense  only if, in the sole  discretion  of USC, the net worth,  assets and
earnings of such prospective  SUBLICENSEE are deemed sufficient to protect USC's
economic interests in the event of claims, liability, demands, damages, expenses
and losses from death, personal injury, illness, or property damage.

26. ATTORNEYS' FEES

     In any action on or concerning this Agreement,  the prevailing  party shall
be awarded its reasonable attorneys' fees, costs and necessary disbursements, to
be paid by the nonprevailing party.

27. PRODUCT DEVELOPMENT

     If Licensee exercises its option, Licensee shall use its reasonable efforts
to test, develop the PRODUCT for commercial purposes throughout the world. On or
before  January 1 of each year  during  the term of this  Agreement,  commencing
January 1, 1994,  Licensee shall submit to USC a report  detailing its research,
regulatory  approval,  marketing and product  development  objectives the coming
year as well as the research,  regulatory  approval,  marketing and  development
activities which Licensee undertook during the preceding year. The reports shall
identify   specific   future   milestones   (regulatory   approval  and  product
development)  and  information  demonstrating  that the  Licensee  is  providing
sufficient  financial  and manpower  resources to evidence its use of reasonable
efforts.  Within six (6) months after the signing of this Agreement and each two
years   thereafter,   provided  that   Licensee  has  executed  its  option,   a
representative  of the Office of Patent and Copyright  Administration of USC, at
Licensee's expense (including transportation,  and, if appropriate,  lodging and
meals),  shall visit the manufacturing and marketing  facilities of Licensee and
be  presented  with an in-depth  updating  of the  manufacturing capability  and
marketing  network of Licensee.  No visit shall take place  unless  Licensee has
exercised its option.

28. INDEPENDENT CONTRACTOR

     In rendering  performances  under this  Agreement,  Licensee  will function
solely as an independent contractor and not as agent, partner, employee or joint
venturer with USC.

29. ENTIRE AGREEMENT

     This  Agreement  constitutes  the  entire  agreement  between  the  parties
concerning the subject matter hereof. No amendment of


                                      -15-





this  Agreement  shall be binding on the parties unless  mutually  agreed to and
executed in writing by each of the parties.


UNIVERSITY OF SOUTHERN                      PERARDUA INVESTORS, L.P.
CALIFORNIA

/s/ Dennis F. Dougherty                     /s/ Norman H. Scheint
- -------------------------------------       -----------------------------------
(Signature)                                 (Signature)

Dennis F. Dougherty                         Norman H. Scheint
- -------------------------------------       -----------------------------------
(Print or Type Name)                        (Print or Type Name)


Senior Vice President,                      President, PerArdua, Inc. 
Administration                              General Partner
- -------------------------------------       -----------------------------------
(Official Title)                            (Official Title)


3-28-94                                     3-9-94
- -------------------------------------       -----------------------------------
(Date)                                      (Date)



ACKNOWLEDGED


/s/ Charles E. McKenna
- -------------------------------------
Charles E. McKenna
Department of Chemistry
Principal Investigator


3/28/94
- -------------------------------------
(Date)



                                      -16-





          
                                   APPENDIX A



                  Filing                 Issue   
USC #  Serial #   Date       Patent #    Date     Country         TITLE
- --------------------------------------------------------------------------------
2227   369,468    6/21/89   5,072,032   12/10/91   U.S.A.   Preparation and Use
                                                            of Thiophosphonates
                                                            and Thioanalogues of
                                                            Phosphonoformic Acid


2227A  768,155    9/30/91   5,183,812     2/2/93   U.S.A.   Preparation and Use 
                                                            of Thiophosphonates 
                                                            and Thioanalogues of
                                                            Phosphonoformic Acid
                                                            


                                      -17-






                               DRAFT APRIL 1, 1996


                                   AMENDMENT

THIS  AMENDMENT is between the  UNIVERSITY OF SOUTHERN  CALIFORNIA  (hereinafter
USC), a California nonprofit corporation with its principal place of business at
University Park, Los Angeles,  California 90089, and PerArdua Investors, L.P., a
California  limited  partnership,  with its  principal  place of business at One
Embarcadero Center,  Suite 1200, San Francisco,  California 94111,  (hereinafter
Licensee).

WHEREAS  USC  and  Licensee  are  parties  to  an Option and  License  Agreement
(hereinafter "AGREEMENT") for certain USC inventions;

WHEREAS the initial  eighteen  month option period as set forth in paragraph 3.a
has  been  extended  twelve  months  upon  the  occurance  of one or more of the
conditions specified in paragraph 3.a.i, 3.a.ii or 3.a.iii of the AGREEMENT;

WHEREAS Licensee desires to obtain an additional extension to the options period
in the  AGREEMENT  in  consideration  of the  payment  of  additional  funds  in
connection with an extension of an existing research grant.

NOW, THEREFORE, in consideration of the covenants herein contained,  the parties
agree as follows:

     Provided  the  Licensee  pays  to USC  $32,813  (under  a separate  written
agreement  for the  extension  of existing  research  grant(s)  executed by each
party) on or before  October 1, 1996, the Option period in Paragraph 3.a. of the
AGREEMENT shall be extended to and including October 1, 1997.

     The  conditions  specified in paragraphs  3.a.i,  3.a.ii and 3.a.iii of the
Agreement  applied only to the initial eighteen month option period specified in
paragraph  3.a of the  AGREEMENT  and the  occurance of any of these  milestones
shall have no effect on the duration of the option period as amended herein.




UNIVERSITY OF SOUTHERN                      PERARDUA INVESTORS, L.P.
CALIFORNIA

/s/ Dennis F. Dougherty                     /s/ Craig H. Scheint
- -------------------------------------       -----------------------------------
(Signature)                                 (Signature)

Dennis F. Dougherty                         Craig H. Scheint
- -------------------------------------       -----------------------------------
(Print or Type Name)                        (Print or Type Name)


                                            President & CEO, PerArdua, Inc. 
Sr. V.P., Administration                    its General Partner
- -------------------------------------       -----------------------------------
(Official Title)                            (Official Title)


4-2-96                                      4-15-96
- -------------------------------------       -----------------------------------
(Date)                                      (Date)






                             STOCKHOLDERS' AGREEMENT

         AGREEMENT made as of this 8th day of July,  1996, by and among PerArdua
Corporation,  a Missouri  corporation  (the  "Corporation"),  and the  following
owners of the Common Stock,  par value $.001 per share, of the Corporation  (the
"Shares"):  Francis E. O'Donnell,  Jr.  ("O'Donnell"),  Samuel P. Sears, Jr., as
Trustee of the Jonnie R. Williams  Irrevocable Trust #1 ("Williams"),  Thomas L.
DePetrillo  ("DePetrillo"),  Samuel P. Sears, Jr. ("Sears"),  Charles E. McKenna
("McKenna"),  Thomas Wolfe ("Wolfe"), Mary Anthony Gray ("Gray"), the University
of Southern California ("USC"),  and the Limited Partners of PerArdua Investors,
L.P. on the  attached  Exhibit A. All of the above named  stockholders  shall be
collectively  referred to hereinafter as the "Stockholders" and may individually
and  interchangeably  be referred to as a  "Stockholder."  O'Donnell,  Williams,
Sears and DePetrillo shall be referred to collectively as the "O'Donnell Group,"
McKenna,  Wolfe and Gray shall be referred to  collectively  as the "MWG Group,"
and the  remaining  Stockholders  shall be referred to  collectively  as the "LP
Group."

         WHEREAS,  the Corporation and the Stockholders  have devised a plan for
the  financing  of the  Corporation  and  believe  it is in  their  mutual  best
interests  to  provide  for  stability  of  management  and stock  ownership  in
furtherance  of said  financing  plan; 

         NOW,  THEREFORE,  for good and valuable  consideration  the receipt and
sufficiency  of  which is  hereby  acknowledged,  the  parties  hereto  agree as
follows:

   1. Subscriptions.

         The  Corporation   hereby  accepts  each  of  the  subscriptions   (the
"Subscriptions")  for purchase of Shares and Common Stock warrants  ("Warrants")
of each of USC, the MWG Group and the LP Group, a form of which  Subscription is
attached hereto as Exhibit B. The amounts of Shares and Warrants to be purchased
by each of USC,  the MWG  Group  and the LP Group  are set  forth on  Exhibit  C
attached  hereto.  The form of the  Warrants  is set forth as Exhibit D attached
hereto. The Corporation shall issue certificates for the Shares and the Warrants
as soon as  practicable  after the date hereof and upon  payment of the purchase
price thereof.

2. Certificate of Amendment.

         The   Corporation   shall  file  a  certificate  of  amendment  to  its
certificate  of  incorporation  to provide for cumulative  voting.  Prior to the
initial public  offering of the Company's  securities on the terms  described in
Section 5 hereof,  the parties hereto shall  thereupon use their best efforts to
cause  a new  certificate  of  amendment  to the  Corporation's  certificate  of
incorporation to be filed to eliminate the cumulative voting provisions thereof.

                                       1.




         3. Private Placement.

         The Corporation and the O'Donnell Group shall use their reasonable best
efforts to effect a private  placement of 800,000 Shares of the Corporation at a
price of $1.25 per share for total  proceeds of  $1,000,000  within  ninety (90)
days of the date of this  Agreement  (the  "Private  Placement").  Such proceeds
shall be used to exercise that certain  Option to purchase  assets from PerArdua
Investors,  L.P.  pursuant to the Option and Asset Purchase  Agreement  dated of
even date  herewith,  and to  support  pre-clinical  studies  for the  continued
development of the drug  Thiofoscarnet  estimated to be approximately  $150,000,
and to provide working capital for the Corporation.

         4. Call Rights.

         In the event the  Private  Placement  is not  effected  as  defined  in
Section 3 above, PerArdua Investors, L.P., a California limited partnership (the
"Partnership")  shall  have the  right  to  purchase  from  each  member  of the
O'Donnell  Group  all of  their  Shares  at a price  of  $.001  per  Share  (the
"O'Donnell Call Right"). The O'Donnell Call Right shall be exercised, if at all,
by written  notice  thereof given to each of the O'Donnell  Group within 30 days
after the end of the 90-day period  described in Section 3. Upon such  exercise,
each of the O'Donnell  Group shall promptly  tender the  certificates  for their
Shares for transfer.  Also upon such  exercise,  all of the Warrants held by the
O'Donnell Group shall be automatically cancelled.

         5. No Issuance of Shares.

         The  parties  agree  that,  while  this  Agreement  is in  effect,  the
Corporation  shall not issue any Shares or other  securities of the  Corporation
except (a) pursuant to the Private Placement, (b) pursuant to the Subscriptions,
(c) Shares  issuable upon  exercise of Warrants  held by the O'Donnell  Group to
purchase  500,000  Shares  at a  price  not  less  than  $10.00  per  Share  and
exercisable only after such time as the Corporation has an FDA approved drug for
sale ("FDA Approval"), and (d) options to purchase 500,000 Shares at an exercise
price of $7.50 exercisable following FDA Approval,  which options may be issued,
if at all, to members of management of the  Corporation in the discretion of its
Board of Directors.  Notwithstanding the restriction upon issuance of Securities
contained  herein,  it is  understood  and agreed that the  Corporation  and the
O'Donnell Group shall use their reasonable best efforts to obtain,  on or before
December 31, 1996, a so-called "firm  commitment" for an initial public offering
from a  securities  underwriter  for the purchase  and sale,  subsequent  to the
Private  Placement,  of  1,000,000  Shares  at  $5.00  per  Share  in  a  "unit"
transaction  whereby a warrant to  purchase a Share at $7.50 per Share  would be
sold with each Share sold (the "IPO").  The  Corporation and the O'Donnell Group
shall use their  reasonable best efforts to close the IPO on or before March 31,
1997. 

                                       2.






  6. Restrictions on Transfer.

         (a) No Stockholder  shall sell or otherwise  transfer any of the Shares
without the prior consent of the Board of Directors of the Corporation.

         (b) The  restriction  set forth in this Section 6 is in addition to any
restrictions which may be set forth in the Subscription  Agreements with respect
to the Subscriptions.

  7. "Lock-up" Agreement.

         Each of the Stockholders agrees that, in connection with the IPO and if
required by the underwriter of the IPO, each Stockholder  shall agree, and shall
execute  and deliver a written  instrument  to that  effect,  that he, she or it
shall not sell any Shares  following the date of the IPO and for a period not to
exceed one year (the "Lock Up  Period")  thereafter  without  the prior  written
consent  of  said  underwriter;  provided  however,  that  the  Lock  Up  Period
automatically  shall be reduced to such shorter lock up period applicable to any
other Corporation shareholder in connection with any public offering.

8. Cooperation with Private Placement and Registration
   Process.

         Each of the Stockholders  agrees that he, she or it will cooperate with
the  Corporation  with respect to the Private  Placement and the IPO by promptly
providing such  information and by executing and delivering such instruments and
documents as may be reasonably requested by the Corporation for such purposes.

9. Voting Agreement.

         USC, the MWG and the LP Group agree that for the term of this Agreement
they shall vote their shares for the election of the O'Donnell Group  Directors,
to the extent that such vote is  necessary  when added to the votes cast for all
shares  held by the  O'Donnell  Group  Members  to  elect  such  directors.  The
"O'Donnell Group Directors" means the minimum number of directors constituting a
majority of the Board of Directors who shall have been appointed by O'Donnell.

10. Stockholder Rights.

         Prior to the closing of the IPO, a representative elected by a majority
in interest of USC, the LP Group and the MWG Group,  voting  together (with each
share of common stock entitled to one vote), (the  "Representative")  shall have
the right to receive due notice of all meetings of the Board of  Directors,  and
shall have the rights to attend and  participate in the  discussions at all such
meetings.  The  Representative  shall  have the  right to  receive  all  written
material and  information  made  available to the Board of Directors,  including
without  limitation,  audited  financial  information  for the  Corporation.  In
addition, prior to December 31, 1996, the Company will deliver to the


                                       3.



Representative,  as soon as  practical  after  the end of each  month and in any
event within thirty (30) days  thereafter,  a consolidated  balance sheet of the
Company  and  its  subsidiaries,  if  any,  as at the  end  of  such  month  and
consolidated  statements  of  income  and  cash  flows  of the  Company  and its
Subsidiaries,  for each month and for the current  fiscal year of the Company to
date, all subject to normal year-end audit  adjustments,  prepared in accordance
with generally accepted accounting principles consistently applied and certified
by the principal financial or accounting officer of the Company, together with a
comparison of such statements to the  corresponding  periods of the prior fiscal
year and to the  Company's  operating  plan then in effect and  approved  by its
Board of Directors. Following December 31, 1996, all of the foregoing statements
shall be prepared and delivered to the Representative on a quarterly basis.

 11. Legend Requirements.

         (a)  Certificates  representing  all shares of the common  stock of the
Corporation  shall be endorsed  with a legend which  provides  substantially  as
follows:
            THE SALE OR TRANSFER OF THE  SECURITIES  REPRESENTED  BY
            THIS CERTIFICATE ARE SUBJECT TO THE TERMS AND CONDITIONS
            OF THAT CERTAIN  STOCKHOLDERS'  AGREEMENT  DATED JULY 8,
            1996 (AS SUCH AGREEMENT MAY BE AMENDED) BY AND AMONG THE
            CORPORATION  AND  ITS  SHAREHOLDERS.   A  COPY  OF  SUCH
            AGREEMENT  IS ON FILE  IN THE  PRINCIPAL  OFFICE  OF THE
            CORPORATION, A COPY OF WHICH WILL BE SENT WITHOUT CHARGE
            TO EACH  STOCKHOLDER WHO SO REQUESTS.  SUCH REQUEST MUST
            BE  MADE  TO THE  SECRETARY  OF THE  CORPORATION  AT ITS
            PRINCIPAL OFFICE.

         (b) The legend  described in paragraph  (a) of this Section 11 shall be
removed upon the termination of this Agreement.

 12. Termination.

         This  Agreement,  and all  obligations  set  forth  herein  (except  as
specially otherwise  provided) shall  automatically  terminate upon the first to
occur of the following:

         (a) the valid  exercise by the  Partnership of the O'Donnell Call Right
(the  obligations  to close the purchase and sale of Shares subject to such call
rights  shall  survive  termination);  

         (b) the closing of the IPO;

         (c) June 30,1997; or

         (d)  written  agreement  of all  the  Stockholders  to  terminate  this
Agreement.


                                       4.




         It is  understood  and agreed that each of the  agreements,  other than
this  Agreement,   which  are  referenced  in  this  Agreement  has  independent
significance  and shall not be terminated by reason of the  termination  of this
Agreement.



         13. Miscellaneous.

                   (a) Notices.  All notices and communications  provided in, or
given in connection  with,  this  Agreement  shall be deemed given if in writing
delivered  personally,  or sent by overnight  courier  service,  by certified or
registered  mail,  postage  prepaid,  or by facsimile  transmission and shall be
deemed received, in the case of personal delivery,  when delivered,  in the case
of overnight  courier  service,  on the next business day after delivery to such
service, in the case of mailing, on the third postal delivery day after mailing,
and, in the case of facsimile  transmission,  upon  transmittal.  Notices to any
party shall be sent to it at the address set forth  opposite  the  Stockholder's
name on  Exhibit  A  attached  hereto,  or in the  case of the  Corporation  c/o
O'Donnell,  or any other  address of which the other  parties  are  notified  in
writing.

                   (b) Binding  Effect;  Assignment.  All the provisions of this
Agreement  shall be binding upon and inure to the benefit of the parties  hereto
and  their  respective  heirs,  representatives,   successors  and  assigns.  No
assignment hereof shall relieve any party of its obligations hereunder.

                   (c)  Amendments.  Any term,  agreement  or  condition of this
Agreement may be amended or waived if, but only if, such  amendment or waiver is
in writing signed by all the parties hereto or, in the case of a waiver,  by the
party waiving an obligation or condition applicable to the other parties.

                   (d)  Severability.  Any provision of this Agreement  which is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be  ineffective  only to the  extent  of such  prohibition  or  unenforceability
without invalidating the remainder of such provision or the remaining provisions
hereof or affecting  the  validity or  enforceability  of such  provision in any
other jurisdiction.

                   (e) Arbitration. Except with respect to a claim for equitable
relief, any controversy or claim arising out of, or relating to, this Agreement,
or  the  making,  performing,  or  interpreting  hereof,  shall  be  settled  by
arbitration  according to the following  rules:  (i) arbitration will be held in
San Francisco, California in accordance with the Commercial Arbitration Rules of
the American  Arbitration  Association then in effect; (ii) the arbitration will
be conducted by a single  arbitrator who is a licensed attorney with at least 15
years of  experience  in dealing with  statutory  close  corporations  formed in
jurisdictions  including  Delaware  and  California;  in the  absence  of mutual
agreement on a single arbitrator, each relevant party


                                       5.




to the  arbitration  will  submit  three names of  proposed  arbitrators  to the
Presiding  Judge of the San Francisco  Superior  Court who will be petitioned to
select  one person to serve as the  arbitrator;  (iii) the  arbitration  will be
conducted in an expedited manner,  designed to preserve the  confidentiality  of
the dispute;  (iv) the decision of the  arbitrator  will be final and binding in
the absence of manifest  fraud;  and (v) the arbitrator will be directed to make
findings as to which parties have substantially  prevailed in the proceeding and
which parties have failed  substantially to prevail in the proceeding,  with the
parties  who have failed  substantially  to prevail  being  joint and  severally
liable for the fees and expenses of the arbitrator and the reasonable attorneys'
fees and costs of the prevailing parties.

                   (f)  Governing Law.  This  Agreement  shall be  construed  in
accordance with and governed by the laws of the State of Missouri.

                   (g)  Counterparts.  This  Agreement  may be  executed  in any
number of counterparts,  each of which when so executed shall be deemed to be an
original and shall be binding upon all  parties,  their heirs,  representatives,
successors and assigns, and all of which taken together shall constitute one and
the same agreement.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first written above.

  O'DONNELL GROUP:                         /S/
                                          ------------------------------
                                          Francis E. O'Donnell, Jr.

                                           /s/
                                          ------------------------------
                                          Samuel P. Sears, Jr.,
                                          as Trustee for the Jonnie R.
                                          Williams Irrevocable Trust #1




                                           /s/
                                          ------------------------------
                                          Thomas L. DePetrillo

  MWG GROUP:                               /S/
                                          ------------------------------
                                          Samuel P. Sears, Jr.

                                           /s/
                                          ------------------------------
                                          Charles E. McKenna

 
                                       6.






                                           /s/
                                          ------------------------------
                                          Thomas Wolfe



                                           /s/
                                          ------------------------------
                                          Mary Anthony Gray




USC:                                     THE UNIVERSITY OF 
                                         SOUTHERN CALIFORNIA


                                           /s/
                                          ------------------------------
                                          Its:                                  
                                              --------------------------


LIMITED PARTNERS:                          /s/
                                          ------------------------------
                                          Print Name: 
                                                     -------------------



THE CORPORATION:                         PERARDUA CORPORATION

                                           /s/
                                          ------------------------------
                                          Its:
                                              --------------------------


                                       7.



                                                                    EXHIBIT 10.7

                              EMPLOYMENT AGREEMENT

         AGREEMENT,  dated and  effective as of September 3, 1996 by and between
PerArdua Corporation,  a Missouri corporation,  (the "Company") and Mary Anthony
Gray,  an individual  with an ADDRESS AT 10538  Strathmore  Drive,  Los Angeles,
California 90024 ("Executive"). 

                                  WITNESSETH:

         WHEREAS,  the Executive is willing to serve as Executive Vice President
and Chief  Operating  Officer of the Company,  and the Company desires to retain
the Executive in such capacities on the terms and conditions herein set forth;

         NOW,  THEREFORE,  in  consideration  of  the  mutual  covenants  herein
contained,  and   other  good  and  valuable  consideration,   the  receipt  and
sufficiency of  which are hereby  acknowledged,  the parties hereto hereby agree
as follows:

         1. Employment; Position and Duties; Extent of Services.
                   
                   (a)  Employment.  The Company agrees to employ the Executive,
and the Executive agrees to be employed by the Company, for the Term provided in
Section 2 below and upon the other terms and conditions hereinafter provided.
                   
                   (b)  Position  and  Duties.  During  the Term as  defined  in
Section  2  herein,  the  Executive  agrees  to  serve  as  the  Executive  Vice
President  and Chief  Operating  Officer  of the  Company  and to  perform  such
reasonable  duties  consistent  with such  position as may be  delineated by the
Chief  Executive  Officer and as may be assigned to her from time to time by the
Board of Directors and/or Chief Executive Officer of the Company.
                   
                   (c) Extent  of  Services.  During  the Term,  and except for
illness or  incapacity,  the executive  shall devote not less than  seventy-five
percent (75%) of her business time, attention,  skill and efforts exclusively to
the business  and affairs of the  Company,  shall not be engaged in any business
activity in  violation of Section 6 of this  Agreement  or which would  conflict
with her  obligations  hereunder,  and  shall  perform  and  discharge  well and
faithfully  the  duties  which may be  assigned  to her from time to time by the
Chief  Executive  Officer  and/or Board of Directors;  provided,  however,  that
nothing   in  this  Agreement  shall  preclude   the   Executive  from  devoting
reasonable  time  during  reasonable  periods  required  for  any  or all of the
following:


                                        1



                   (i)  serving as a director  or member of a  committee  of any
other  company or  organization  involving  no actual or  potential  conflict of
interest with the Company or any of its subsidiaries or affiliates;

                   (ii) engaging in charitable and community activities;
                           
                   (iii)  investing  her personal  assets in  businesses in such
form or manner as will not require any services on the part of the  Executive in
the operation or affairs of such businesses; and/or

                   (iv)  serving  as  biotechnology   transfer  advisor  to  the
University of Southern California in a manner similar to the period prior to her
employment with the Company.
         
         At the request of the Company,  the Executive  shall advise the Company
of the nature and identity of other business organizations or endeavors in which
she may be involved.

         2. Term of Employment.

         The Company  hereby agrees to employ the  Executive,  and the Executive
hereby agrees to accept such employment in the capacity set forth herein,  for a
period of time commencing on the Monday  following the date on which the Company
shall have  completed a  $1,000,000  private  placement  of its Common  Stock to
investors (the "Commencement Date"), but if the Commencement Date shall not have
occurred on or prior to October 31, 1996,  then this Agreement shall be null and
void and of no further  force and  effect..  The term shall  continue  after the
Commencement  Date  until  the  first to occur of the  following:  (i) the first
anniversary  of  the  Commencement   Date,  or  (ii)  the  closing  date  of  an
underwritten  initial public offering of the Company's securities which Offering
has been registered with the Securities and Exchange Commission  pursuant to the
registration  provisions of the  Securities  Act of 1933, as amended;  provided,
however,  that either party may terminate  this agreement at any time by written
notice to the other  given at least  ninety  (90) days prior to the  termination
date specified in such written notice.  The Company agrees that, at least thirty
days prior to the anticipated expiration of the term specified  hereinabove,  it
will,  if the  Executive so desires,  negotiate in good faith with the Executive
regarding  continued  employment  beyond  said  expiration  date  pursuant  to a
compensation  arrangement  which would include a performance  bonus in the event
the Executive refers to the Company,  and the company acquires or obtains rights
to or an  exclusive  license  to,  products  or  rights  to  products  which are
complementary to products or rights then possessed by the Company.



                                        2



         3. Compensation.
                  
         As compensation to the Executive for all services to be rendered by her
in any capacity  hereunder,  the Company shall pay a monthly salary at a rate of
Five Thousand and no/100 Dollars  ($5,000.00)  payable twice monthly.  Executive
shall be  entitled  to four (4)  weeks  paid  vacation  per year.  In  additions
promptly upon commencement of Executive's employment hereunder the Company shall
grant to her  incentive  stock  options to purchase  lO,OOO shares at a price of
$7.50 per share and fully vesting one year after said commencement date.


         4. Location.

         Executive  shall  maintain  an office  at,  and shall  work out of, her
residence in Los Angeles,  California or such other residence that she maintains
from time to time in the United  States.  The Company shall pay to Executive the
sum of One Thousand  Dollars  ($1,000) each month to defray the costs of such an
office and,  in addition to such monthly payment,  shall provide and pay for the
following:  a separate telephone line dedicated to the affairs of the Company; a
separate  telephone  facsimile  line  dedicated to the  affairs of the  Company;
appropriate  telephone and facsimile  equipment;  a personal computer and  modem
as may be acceptable to the Company in its discretion reasonably exercised;  any
computer  software  acceptable  to  the  Company  in its  discretion  reasonably
exercised;  and such other office  supplies and  equipment as may be approved in
advance by the  Company.  The  Company  is not  obligated  to provide any office
furniture.

         5. Trade Secrets and Confidential Information.

         (a) Definition. As used in this Agreement (i) "Confidential Information
and  Trade  Secrets"  means  all  information,  processes,  process  parameters,
methods,  practices,  chemical  and  other  formulae,   fabrication  techniques,
technical  plans,  algorithms,  computer  programs  and  related  documentation,
customer  lists,  price  lists,  supplier  lists,   marketing  plans,  financial
information,  and all other  compilations  of  information  which  relate to the
business of the  Company and which have not been  released by the Company to the
general public,  but shall not include general technical and business skills and
expertise  which  Executive  has  acquired  or  developed  by  reason  of  prior
experience,  and  (ii) a  "Business  Competitive  with  the  Company"  means  an
enterprise  which is engaged in the  development  or  promotion  of a product or
service which may be reasonablely  considered to compete,  or have the potential
to compete,  in the marketplace with a product or service which the Company  has
been developing or promoting, or has had plans to develop or promote, at anytime
during the Executive's employment hereunder.

         (b) Restrictive Covenants.

         (i) EXECUTIVE acknowledges that during the term of employment with the




                                        3





Company,   Executive  will  have  access  to  and  become  acquainted  with  the
Confidential Information and Trade Secrets of the Company.  Executive agrees not
to use or disclose  (directly or indirectly)  any  Confidential  Information and
Trade Secrets of the  Company at any time or in  any manner,  except as required
in the course of employment with the Company.  The obligations of this paragraph
are continuing and survive the  termination of Executive's  employment  with the
Company.  All documents  and equipment  relating to the business of the Company,
whether prepared by Executive or otherwise  coming into Executive's  possession,
are the  exclusive  property of the  Company,  and must not be removed  from the
premises of the Company except as required in the course of employment  with the
Company.  All such  documents and equipment must be returned to the Company when
Executive leaves the employment of the Company.
                  

         (ii) While employed by the Company,  Executive  agrees not to undertake
any  planning  for any  outside  business  which  would  constitute  a  Business
Competitive with the Company.
                  

         (iii)  While  employed by the Company and for five (5) years after that
employment  ends,  Executive  agrees  not to enter  into any  employment  with a
Business  Competitive with the Company in which the complete  fulfillment of the
duties of the  competitive  employment  would  inherently  require  Executive to
reveal  or use any of the  Confidential  Information  and Trade  Secrets  of the
Company learned or obtained by Executive while employed by the Company.
                  

         (iv) While  employed  by the  Company and for five (5) years after that
employment  ends,  Executive  agrees  not to divert  or  attempt  to divert  (by
solicitation or by any other means) the customers of the Company existing at the
time Executive's employment ends.

         (c)  No  Conflict.   

              The  Company   acknowledges   and  agrees  that  the   Executive's
activities  as  biotechnology  transfer  advisor to the  University  of Southern
California  shall  not  be in  conflict  with  any  of the  provisions  of  this
agreement.

         6. Miscellaneous.

              (a) Successors and Assigns.  This Agreement is intended to benefit
and is binding on (i) the  successors  and  assigns of the  Company and (ii) the
heirs and legal successors of Executive.

              (b) Governing law. This Agreement shall be construed in accordance
with and governed by the laws of the State of California.



                                        4


              (c) Separate  Enforcement of Provisions.  If for any reason a part
of this  Agreement is  unenforceable,  the remainder of the  Agreement  shall be
enforced to the extent possible.

              (d) Modification of Agreement. This Agreement may only be modified
by a writing signed (i) by Executive and (ii) by an authorized representative of
the Company.
  
              (e) No Conflicting Contracts.  Executive represents that Executive
has no  contracts  with any other party that would  interfere  with  Executive's
compliance with the terms and conditions of this Agreement.

              (f) No  Right  to  Continuing  Employment.  No  provision  of this
Agreement shall be construed as giving Executive the right to be retained in the
employment  of the  Company,  except to the  extent  expressly set forth in this
Agreement.


Executed as of the date first above  written.

                                                       
/S/ Mary Anthony Gray
- ---------------------------------------------         PerArdua Corporation
Mary Anthony Gray                                  
                                                    By: /S/ Samuel P. Sears, Jr.
                                                      -------------------------
                                                           Treasurer











                                 AMENDMENT NO.1
                                       TO
                              EMPLOYMENT AGREEMENT

     Reference is made to an Employment  Agreement  dated  September 3, 1996, by
and between PerArdua  Corporation,  a Missouri corporation which,  subsequent to
September  3,  1996,  merged  with and into  PerArdua  Corporation,  a  Deleware
corporation  (the"Company") and Mary Anthony Gray, an individual with an address
at 10538 Strathmore Drive, Los Angeles , California 90024 ("Executive").

     The Company and Executive do hereby agree to amend the aforesaid Employment
Agreement, as follows:

     1.Section 1 (b): The words "and Chief Operating Officer" are deleted.

     2. Section 1 (c): In the first sentence,  the  words/numbers  "seventy-five
percent (75%)" are deleted,  and there is substituted  therefor  "eighty percent
(80%)."

     3.Section 2:  The parties  acknowledge  that the  Comencement  Date occured
prior to  October  31,  1996.  The  second  sentence  is  deleted  and  there is
substituted  therefor  the  following:   "The  term  shall  continue  after  the
Commencement Date until February 29, 2000, provided,  however, that either party
may terminate this agreement at any time by written notice to the other given at
least ninety (90) days prior to the  termination  date specified in such written
notice."

     4. Section 3: Beginning with the Monday first  following the effective date
(the  "Effective  Date")  of an  underwritten  initial  public  offering  of the
Company's  securities which offering has been registered with the Securities and
Exchange  commission  pursuant to the registration  provisions of the Securities
Act of 1933, as amended,  the Executive's monthly salary shall be increased from
$5,000 per month to $7,000 per month. The balance of the provisions in Section 3
shall remain in full force and effect. In addition. Executive shall receive upon
Effective  Date stock options  pusuant to the  Company's  1996  Incentive  Stock
Option Plan to purchase  100,000 shares of the Company's Common Stock at a price
not less than $5.00 per share.  Such options shall be contingent  upon continued
employment with the Company, and shall vest at the following rate: 35,000 shares
on January 1, 1998,  35,000 shares January 1, 1999, and 30,000 shares on January
1, 2000.  Executive  shall also be entitled to receive upon the  Effective  Date
medical  insurance  to the  same  extent  as is  provided  to  other  management
personnel of the Company.

     Except as amended hereby,  the Company and Executive  hereby ratify confirm
and approve the Employment Agreement.

     Executed as of February 20, 1997.


                                             Company:  PerArdua Corporation

                                                  by: Samuel P. Sears
                                                      -----------------------

                                             Executive: Mary Anthony Gray
                                                        -----------------------
                                                        Mary Anthony Gray




                                                                    EXHIBIT 10.8


                            INDEMNIFICATION AGREEMENT


         THIS  AGREEMENT is made and entered into this ____day of _______,  1997
by and between PerArdua Corporation, a Delaware corporation ("Corporation"), and
______________("Director").

                                    RECITALS:

         A.  Director  currently  serves as a member of  Corporation's  Board of
Directors and performs a valuable service in such capacity for Corporation;

         B. The Certificate of Incorporation  (the  "Certificate")  provides for
the  indemnification  of  the  officers,  directors,  agents  and  employees  of
Corporation  to the maximum  extent  authorized  by Section 145 of the  Delaware
General Corporation Law, as amended (the "Law");

         C. The Certificate and the Law, by their non-exclusive  nature,  permit
contracts between  Corporation and its directors with respect to indemnification
of directors of Corporation;

         D. In  accordance  with  the  authorization  as  provided  by the  Law,
Corporation  may from time to time purchase and maintain a policy or policies of
directors and officers liability insurance ("D & O Insurance"), covering certain
liabilities  which  may  be  incurred  by  its  directors  and  officers  in the
performance of services as directors and officers of Corporation;

         E.  As  a  result  of  developments  affecting  the  terms,  scope  and
availability  of D & O Insurance  there  exists  general  uncertainty  as to the
extent and overall  desirability of protection  afforded directors by such D & O
Insurance,  if  any,  and  by  indemnification   provisions  set  forth  in  the
Certificate and the Law; and

         F. In order to  induce  Director  to  continue  to serve as a member of
Corporation's Board of Directors, Corporation has determined and agreed to enter
into this contract with Director.

         NOW, THEREFORE,  in consideration of Director's  continued service as a
member of  Corporation's  Board of Directors after the date hereof,  the parties
hereto agree as follows:

         1.  INDEMNITY  OF  DIRECTOR.  Corporation  agrees to hold  harmless and
indemnify  Director  to  the  fullest  extent  authorized  or  permitted  by the
provisions of the Law, as it may be amended from time to time.

         2.  ADDITIONAL  INDEMNITY.  Subject only to the exclusions set forth in
Section 3 hereof,  Corporation  further  agrees to hold  harmless and  indemnify
Director:







                  (a) against any and all legal expenses  (including  attorneys'
fees),  witness fees,  judgments,  fines and amounts paid in settlement actually
and reasonably  incurred by Director in connection with any threatened,  pending
or completed action, suit or proceeding, whether civil, criminal, administrative
or  investigative  (including  an action by or in the right of  Corporation)  to
which  Director is, was or at any time becomes a party,  or is  threatened to be
made a party, by reason of the fact that Director is, was or at any time becomes
a director,  officer, employee or agent of Corporation,  or is or was serving or
at any time  serves  at the  request  of  Corporation  as a  director,  officer,
employee or agent of another  corporation,  partnership,  joint venture,  trust,
employee benefit plan or other enterprise; and

                  (b)  otherwise  to the  fullest  extent as may be  provided to
Director by Corporation under the non-exclusivity  provisions of the Certificate
of Corporation and the Law.

         3.  LIMITATIONS  ON  ADDITIONAL  INDEMNITY.  No  indemnity  pursuant to
Section 2 hereof shall be paid by Corporation:

                  (a)  except  to the  extent  the  aggregate  of  losses  to be
indemnified  thereunder  exceeds  the sum of such  losses for which  Director is
indemnified  pursuant  to Section 1 hereof or  pursuant  to any D & O  Insurance
purchased and maintained by Corporation;

                  (b) in respect of remuneration paid to Director if it shall be
determined  by  a  final  judgment  or  other  final   adjudication   that  such
remuneration was in violation of law;

                  (c) on  account of any  action,  suit or  proceeding  in which
judgment is rendered against Director for an accounting of profits made from the
purchase  or sale by  Director  of  securities  of  Corporation  pursuant to the
provisions  of  Section  16(b)  of  the  Securities  Exchange  Act of  1934  and
amendments  thereto  or  similar  provisions  of any  federal,  state  or  local
statutory law;

                  (d) on account of Director's conduct which is finally adjudged
to have been knowingly  fraudulent or deliberately  dishonest,  or to constitute
willful misconduct;

                  (e) on account of  Director's  conduct which is the subject of
an action, suit or proceeding described in Section 7(c)(ii) hereof;

                  (f) on account of or arising in response  to any action,  suit
or proceeding (other than an action,  suit or proceeding  referred to in Section
8(b)  hereof)  initiated  by Director or any of  Director's  affiliates  against
Corporation or any officer,  director or stockholder of Corporation  unless such
action,  suit or proceeding was authorized in the specific case by action of the
Board of Directors of Corporation;


                                       2



                  (g) on account of any action, suit or proceeding to the extent
that  Director is a  plaintiff,  a  counter-complainant  or a  cross-complainant
therein  (other than an action,  suit or  proceeding  permitted  by Section 3(f)
hereof); or

                  (h) if a final decision by a Court having  jurisdiction in the
matter shall  determine  that such  indemnification  is not lawful (and, in this
respect, both Corporation and Director have been advised that the Securities and
Exchange Commission believes that  indemnification for liabilities arising under
the  federal  securities  laws is  against  public  policy  and  is,  therefore,
unenforceable  and that  claims  for  indemnification  should  be  submitted  to
appropriate courts for adjudication).

         4. CONTRIBUTION. If the indemnification provided in Sections 1 and 2 is
unavailable  and may not be paid to Director for any reason other than those set
forth in  paragraphs  (b)  through  (g) of  Section  3, then in  respect  of any
threatened, pending or completed action, suit or proceeding in which Corporation
is or is alleged to be jointly  liable with  Director  (or would be if joined in
such action, suit or proceeding),  Corporation shall contribute to the amount of
expenses  (including  attorneys'  fees),  judgments,  fines and amounts  paid in
settlement  actually and reasonably  incurred and paid or payable by Director in
such proportion as is appropriate to reflect (i) the relative  benefits received
by  Corporation  on the one  hand  and  Director  on the  other  hand  from  the
transaction  from which such  action,  suit or  proceeding  arose,  and (ii) the
relative  fault of Corporation on the one hand and of Director on the other hand
in connection with the events which resulted in such expenses,  judgments, fines
or settlement amounts,  as well as any other relevant equitable  considerations.
The relative  fault of  Corporation on the one hand and of Director on the other
hand shall be  determined  by  reference  to, among other  things,  the parties'
relative intent, knowledge,  access to information and opportunity to correct or
prevent  the  circumstances  resulting  in such  expenses,  judgments,  fines or
settlement  amounts.  Corporation agrees that it would not be just and equitable
if  contribution  pursuant  to  this  Section  4 were  determined  by  pro  rata
allocation or any other method of allocation  which does not take account of the
foregoing equitable considerations.

         5.       CONTINUATION OF OBLIGATIONS.

                  (a) All  agreements and  obligations of Corporation  contained
herein  shall  continue  during  the period  Director  is a  director,  officer,
employee  or  agent of  Corporation  (or is or was  serving  at the  request  of
Corporation as a director,  officer,  employee or agent of another  corporation,
partnership,  joint venture,  trust,  employee benefit plan or other enterprise)
and shall  continue  thereafter  so long as  Director  shall be  subject  to any
possible claim or threatened,  pending or completed action,  suit or proceeding,
whether civil,  criminal or  investigative,  by reason of the fact that Director
was serving Corporation or such other entity in any capacity referred to herein.

                  (b)  For  six  years  after  the  effective  time  of (i)  the
acquisition of the  Corporation by another entity by means of any transaction or
series   of   related   transactions   (including,   without   limitation,   any
reorganization,   merger  or   consolidation)   or  (ii)  the  sale  of  


                                       3




all or  substantially  all of the  assets  of the  Corporation  by  means of any
transaction or series of related  transactions,  the  Corporation (to the extent
the   Corporation   is  not  the   continuing   or  surviving   person  of  such
reorganization,  merger,  consolidation  or sale)  shall  cause  the  acquiring,
continuing or surviving  corporation to (x) indemnify and hold harmless Director
in  accordance  with  Sections  1 and 2 hereof,  (y)  provide  contributions  in
accordance  with  Section 4 hereof,  and (z) use its best efforts to provide D&O
Insurance on terms substantially  similar to the terms of the Corporation's then
current  D&O  Insurance  policy  in  effect  on the date  thereof,  or any other
arrangement reasonably satisfactory to Director, in respect of acts or omissions
occurring  on or  prior to the  effective  time of the  reorganization,  merger,
consolidation or sale.

         6.  NOTIFICATION  AND DEFENSE OF CLAIM. Not later than thirty (30) days
after receipt by Director of notice of the  commencement of any action,  suit or
proceeding,  Director will, if a claim in respect  thereof is to be made against
Corporation  under  this  Agreement,  notify  Corporation  of  the  commencement
thereof;  but the omission so to notify Corporation will not relieve it from any
liability  which it may have to Director  otherwise  than under this  Agreement.
With  respect  to any such  action,  suit or  proceeding  as to  which  Director
notifies Corporation of the commencement thereof:

                  (a) Corporation will be entitled to participate therein at its
own expense;

                  (b) except as otherwise  provided below, to the extent that it
may wish,  Corporation  jointly  with any  other  indemnifying  party  similarly
notified will be entitled to assume the defense thereof, with counsel reasonably
satisfactory  to  Director.  After  notice from  Corporation  to Director of its
election  to  assume  the  defense  thereof,  Corporation  will not be liable to
Director  under  this  Agreement  for any legal or other  expenses  subsequently
incurred  by  Director  in  connection  with  the  defense  thereof  other  than
reasonable costs of investigation or as otherwise provided below. Director shall
have  the  right  to  employ  his or her own  counsel  in such  action,  suit or
proceeding but the fees and expenses of such counsel  incurred after notice from
Corporation of its assumption of the defense  thereof shall be at the expense of
Director unless (i) the employment of counsel by Director has been authorized by
Corporation,  (ii) Director shall have reasonably  concluded that there may be a
conflict  of interest  between  Corporation  and  Director in the conduct of the
defense  of such  action or (iii)  Corporation  shall not in fact have  employed
counsel to assume the  defense of such  action,  in each of which cases the fees
and  expenses  of  Director's  separate  counsel  shall  be at  the  expense  of
Corporation.  Corporation  shall not be  entitled  to assume the  defense of any
action, suit or proceeding brought by or on behalf of Corporation or as to which
Director shall have made the conclusion provided for in (ii) above; and

                  (c)  Corporation  shall not be liable  to  indemnify  Director
under this  Agreement  for any amounts paid in settlement of any action or claim
effected without its written consent.  Corporation  shall be permitted to settle
any  action  except  that it shall not  settle any action or claim in any manner
which would  impose any  penalty,  out-of-pocket  liability,  or  limitation  on


                                       4




Director without  Director's written consent.  Neither  Corporation nor Director
will unreasonably withhold its or his or her consent to any proposed settlement.

         7.       ADVANCEMENT AND REPAYMENT OF EXPENSES.

                  (a) In the event that Director  employs his or her own counsel
pursuant to Section  6(b)(i) through (iii) above,  Corporation  shall advance to
Director,  prior to any final  disposition of any threatened or pending  action,
suit or proceeding,  whether civil,  criminal,  administrative or investigative,
any and all reasonable  expenses (including legal fees and expenses) incurred in
investigating or defending any such action,  suit or proceeding  within ten (10)
days after receiving copies of invoices presented to Director for such expenses.

                  (b) Director  agrees that Director will reimburse  Corporation
for all  reasonable  expenses  paid by  Corporation  in  defending  any civil or
criminal  action,  suit or proceeding  against Director in the event and only to
the extent it shall be ultimately  determined by a final judicial decision (from
which  there is no right of appeal)  that  Director is not  entitled,  under the
provisions  of the Law, the  Certificate,  this  Agreement or  otherwise,  to be
indemnified by Corporation for such expenses.

                  (c)  Notwithstanding  the foregoing,  Corporation shall not be
required to advance  such  expenses to Director if Director  (i)  commences  any
action,  suit or proceeding as a plaintiff  unless such advance is  specifically
approved  by a  majority  of the  Board  of  Directors  or (ii) is a party to an
action,  suit or proceeding brought by Corporation and approved by a majority of
the  Board  which  alleges  willful  misappropriation  of  corporate  assets  by
Director,  disclosure  of  confidential  information  in violation of Director's
fiduciary or contractual  obligations to  Corporation,  or any other willful and
deliberate  breach  in bad  faith  of  Director's  duty  to  Corporation  or its
stockholders.

         8.         ENFORCEMENT.

                  (a)  Corporation  expressly  confirms  and agrees  that it has
entered into this Agreement and assumed the  obligations  imposed on Corporation
hereby in order to induce Director to continue as a Director of Corporation, and
acknowledges  that Director is relying upon this Agreement in continuing in such
capacity.

                  (b) In the event  Director  is required to bring any action to
enforce rights or to collect  amounts due under this Agreement and is successful
in such action,  Corporation  shall  reimburse  Director  for all of  Director's
reasonable fees and expenses in bringing and pursuing such action.

         9.  SUBROGATION.   In  the  event  of  payment  under  this  Agreement,
Corporation  shall be  subrogated  to the  extent of such  payment to all of the
rights of recovery of Director,  who shall  execute all  documents  required and
shall do all acts that may be  necessary  to secure  such  rights  and to enable
Corporation effectively to bring suit to enforce such rights.


                                       5




         10. NON-EXCLUSIVITY OF RIGHTS. The rights conferred on Director by this
Agreement  shall not be exclusive of any other right which  Director may have or
hereafter acquire under any statute,  provision of Corporation's  Certificate or
Bylaws,  agreement,  vote of stockholders or Officers, or otherwise,  both as to
action in his or her  official  capacity  and as to action in  another  capacity
while holding office.

         11.  SURVIVAL  OF RIGHTS.  The rights  conferred  on  Director  by this
Agreement  shall continue  after Director has ceased to be a director,  officer,
employee or other agent of  Corporation  or such other entity and shall inure to
the benefit of Director's heirs, executors and administrators.

         12.  SEPARABILITY.  Each  of the  provisions  of  this  Agreement  is a
separate and distinct agreement and independent of the others, so that if any or
all of the provisions hereof shall be held to be invalid or unenforceable to any
extent for any reason, such invalidity or unenforceability  shall not affect the
validity or  enforceability  of the other provisions hereof or the obligation of
Corporation  to  indemnify   Director  to  the  full  extent   provided  by  the
Certificate,  the  Corporation's  Bylaws or the Law, and the affected  provision
shall be construed and enforced so as to effectuate  the parties'  intent to the
maximum extent possible.

         13.  GOVERNING LAW. This Agreement shall be interpreted and enforced in
accordance with the internal laws of the State of Delaware.

         14. BINDING  EFFECT.  This Agreement shall be binding upon Director and
upon Corporation,  its successors and assigns, and shall inure to the benefit of
Director,  his or her heirs,  personal  representatives  and  assigns and to the
benefit of Corporation, its successors and assigns.

         15. AMENDMENT AND TERMINATION. No amendment, modification,  termination
or  cancellation  of this  Agreement  shall be  effective  unless set forth in a
writing signed by both parties hereto.


                                       6





         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement on
and as of the day and year first above written.




                                             PERARDUA CORPORATION


                                             By:
                                                -----------------------
                                             Its:
                                                -----------------------


                                             --------------------------
                                             Director



                                       7





                                                                    EXHIBIT 10.9


                              EMPLOYMENT AGREEMENT


          AGREEMENT,  dated and  effective  as of Feb.  12,  1997 by and between
PerArdua Corporation,  a Delaware corporation,  (the "Company") and Nicholas Jon
Virca,  an individual  with an address at 11475 Cypress Woods Drive,  San Diego,
California 92131 ("Executive").

                              W I T N E S S E T H:

          WHEREAS,  the  Executive  is willing to serve as  President  and Chief
Operating  Officer  of the  Company,  and the  Company  desires  to  retain  the
Executive in such capacities on the terms and conditions herein set forth;

          NOW,  THEREFORE,  in  consideration  of the  mutual  covenants  herein
contained,   and  other  good  and  valuable  consideration,   the  receipt  and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

          1. Employment: Position and Duties: Extent of Services.

                   (a)  Employment.  The Company agrees to employ the Executive,
and the Executive  agrees to be employed by the Company,  for the Term provided
in Section 2 below and upon the other terms and conditions hereinafter provided.

                   (b)  Position  and  Duties.  During  the Term as  defined  in
Section 2 herein,  the  Executive  agrees to serve  as the  President  and Chief
Operating  Officer  of  the  Company  and  to  perform  such  reasonable  duties
consistent  with such  position  as may be  delineated  by the  Chief  Executive
Officer  and as may be  assigned  to him  from  time  to time  by the  Board  of
Directors and/or Chief Executive Officer of the Company.

                   (c)  Extent of  Services.  During  the Term,  and  except for
illness or  incapacity,  the  Executive  shall devote all of his business  time,
attention,  skill and efforts  exclusively  to the  business  and affairs of the
Company, shall not be engaged in any business activity in violation of Section 6
of this Agreement or which would conflict with his obligations  hereunder,  and
shall  perform  and  discharge  well and  faithfully  the  duties  which may be
assigned to him from time to time by the Chief Executive Officer and/or Board of
Directors;  provided, however, that nothing in this Agreement shall preclude the
Executive from devoting  reasonable time during reasonable  periods required for
any or all of the following:


                                       1



               (i) serving as a director  or member of a committee  of any other
company or  organization  involving no actual or potential  conflict of interest
with the Company or any of its subsidiaries or affiliates;

               (ii) engaging in charitable and community activities; and/or

               (iii) investing his personal assets in businesses in such form or
manner as will not require  any  services  on the part of the  Executive  in the
operation or affairs of such businesses.

     At the request of the Company,  the  Executive  shall advise the Company of
the nature and identity of other business organizations or endeavors in which he
may be involved.

          2. Term of Employment.

          The Company hereby agrees to employ the  Executive,  and the Executive
hereby agrees to accept such employment in the capacity set forth herein,  for a
period  beginning  either  March 3 or  March  10,  1997,  the  exact  date to be
determined in the discretion of the Executive,  and expiring  February 29, 2000,
subject to the  provisions  of Section 5 of this  Agreement  (the  "Term").  The
Company  agrees  that,  at least  ninety  (90)  days  prior  to the  anticipated
expiration of the Term, it will, if the Executive so desires,  negotiate in good
faith with the Executive regarding  continued  employment beyond said expiration
date.

          3. Compensation and Benefits.

          As  compensation  to the  Executive for all services to be rendered by
him in any capacity hereunder,  the Company shall pay a monthly salary at a rate
of Ten Thousand and no/100 Dollars  ($10,000.00)  payable  bi-weekly.  Executive
shall be  entitled  to four (4)  weeks  paid  vacation  per year.  In  addition,
promptly  upon  the  closing  of an  underwritten  initial  public  offering  of
Securities of the Company's  Common Stock,  the Company shall grant to him stock
options to purchase 100,000 shares of the Company's Common Stock pursuant to the
provisions  of the  Company's  1996 Stock  Option  Plan at a per share price not
greater  than the  market  value of the  stock on the date of grant and not less
than $5.00 per share.  The options  shall vest as follows:  30,000 shares on the
date of grant, 35,000 shares on June 30, 1998, and 35,000 shares on December 31,
1999. The Company shall  reimburse  Executive for the amounts  necessary for the
Executive to maintain  health  insurance  for himself and his  immediate  family
during the Term  pursuant  to his COBRA  rights  with  respect to his  preceding
employer.  When such rights  expire the Company will pay for  comparable  health
insurance coverage to the extent the same is available. The Company will provide
annual  renewable  term life insurance on the life of the Executive in an amount
of $200,000

                                       2





plus  $100,000  additiona1 in the event of an  accidental  death.  Executive may
designate the beneficiary of such policy.

          4. Location.

          At the commencement of the Term, the Company is maintaining  temporary
executive office space at 10940 Wilshire Boulevard, Los Angeles, California, and
intends to  maintain  such space at least  until the  completion  of the Company
initial public offering of securities. The Company then intends to establish its
executive  offices in the San Diego  area.  Executive  agrees to travel from his
home in San Diego to the Company's  office in Los Angeles so as to be present in
such  office at least three days a week,  subject to any  business  travel.  The
Company will reimburse Executive for his reasonable out-of-pocket expenses, upon
presentation of appropriate  voucher,  for such travel between San Diego and Los
Angeles, including lodging and meals.

          5. Change-of-Control.

          Any of the  following  transactions  shall be deemed to  constitute  a
"Change of Control:"

          (i) the adoption of a plan of merger or  consolidation  of the Company
              with any other corporation as a result of which the holders of the
              outstanding  voting stock of the Company as a group would  receive
              less than 50% of the voting  stock of the  surviving  or resulting
              corporation;

          (ii)the  adoption  of a plan of  liquidation  or the  approval  of the
              dissolution of the Company;

         (iii)the sale or transfer of all or  substantially all of the assets of
              the Company; or

          (iv)a tender offer or exchange  offer for shares of Common Stock other
              than any such offer made by the Company.

          If following a Change of Control the Executive's  employment should be
terminated  for  any  reason  whatsoever,  including  voluntary  termination  by
Executive,  or if Executive  employment's  hereunder  shall be terminated by the
Company at any time  without  good cause,  then  Executive  shall be entitled to
receive in a single lump sum payment, the following:

          (a) an  amount  equal to the  lesser of six (6)  months  salary or the
              amount

                                        3





               of salary then remaining to be payable for the duration of the 
               Term, plus

          (b) an amount equal the then most recent  monthly  payment made by the
              Company for health  insurance  for the Executive and his immediate
              family,  multiplied  by the  lesser of six or the number of months
              then remaining in the Term.

          6. Trade Secrets and Confidential Information.

          (a)   Definition.   As  used  in  this  Agreement  (i)   "Confidential
Information  and  Trade  Secrets"  means  all  information,  processes,  process
parameters,   methods,  practices,  chemical  and  other  formulae,  fabrication
techniques,   technical  plans,   algorithms,   computer  programs  and  related
documentation,  customer lists,  price lists,  supplier lists,  marketing plans,
financial information, and all other compilations of information which relate to
the  business of the Company and which have not been  released by the Company to
the general public,  but shall not include general technical and business skills
and  expertise  which  Executive  has  acquired or  developed by reason of prior
experience,  and  (ii) a  "Business  Competitive  with  the  Company"  means  an
enterprise  which is engaged in the  development  or  promotion  of a product or
service which may be reasonablely  considered to compete,  or have the potential
to compete,  in the marketplace  with a product or service which the Company has
been  developing  or promoting,  or has had plans to develop or promote,  at any
time during the Executive's employment hereunder.

          (b) Restrictive Covenants.

          (i) Executive acknowledges that during the term of employment with the
Company,   Executive  will  have  access  to  and  become  acquainted  with  the
Confidential Information and Trade Secrets of the Company.  Executive agrees not
to use or disclose  (directly or indirectly)  any  Confidential  Information and
Trade Secrets of the Company at any time or in any manner, except as required in
the course of employment with the Company. The obligations of this paragraph are
continuing  and survive  the  termination  of  Executive's  employment  with the
Company.  All documents  and equipment  relating to the business of the Company,
whether prepared by Executive or otherwise  coming into Executive's  possession,
are the  exclusive  property of the  Company,  and must not be removed  from the
premises of the Company except as required in the course of employment  with the
Company.  All such  documents and equipment must be returned to the Company when
Executive leaves the employment of the Company.

          (ii) While employed by the Company,  Executive agrees not to undertake
any  planning  for any  outside  business  which  would  constitute  a  Business
Competitive with the Company.

                                        4



          (iii) While  employed by the Company and for five (5) years after that
employment  ends,  Executive  agrees  not to enter  into any  employment  with a
Business  Competitive with the Company in which the complete  fulfillment of the
duties of the  competitive  employment  would  inherently  require  Executive to
reveal  or use any of the  Confidential  Information  and Trade  Secrets  of the
Company learned or obtained by Executive while employed by the Company.

          (iv) While  employed  by the Company and for five (5) years after that
employment  ends,  Executive  agrees  not to divert  or  attempt  to divert  (by
solicitation or by any other means) the customers of the Company existing at the
time Executive's employment ends.

          7.   Miscellaneous.

               (a) Successors and Assigns. This Agreement is intended to benefit
and is binding on (i) the  successors  and  assigns of the  Company and (ii) the
heirs and legal successors of Executive.

               (b)  Governing  Law.  This   Agreement   shall  be  construed  in
accordance with and governed by the laws of the State of California.

               (c) Separate Enforcement of Provisions.  If for any reason a part
of this  Agreement is  unenforceable,  the remainder of the  Agreement  shall be
enforced to the extent possible.

               (d)  Modification  of  Agreement.  This  Agreement  may  only  be
modified  by a  writing  signed  (i) by  Executive  and  (ii)  by an  authorized
representative of the Company.

               (e) No Conflicting Contracts. Executive represents that Executive
has no  contracts  with any other party that would  interfere  with  Executive's
compliance with the terms and conditions of this Agreement.

               (f) No Right  to  Continuing  Employment.  No  provision  of this
Agreement shall be construed as giving Executive the right to be retained in the
employment  of the  Company,  except to the extent  expressly  set forth in this
Agreement.

Executed as of the date first above written.

 

Nicholas Jon Virca                                  PerArdua Corporation
- ---------------------------
Nicholas Jon Virca
                                                  by: Samuel P. Sears
                                                      --------------------
                                                       Treasurer



                                        5


                                                                   EXHIBIT 10.10


                              PERARDUA CORPORATION

                              STOCK INCENTIVE PLAN


                                    ARTICLE 1
                                   DEFINITIONS


         ARTICLE 1.1 Affiliate means any  "subsidiary"  or "parent  corporation"
(within the meaning of Section 422 of the Code) of the Corporation.

         ARTICLE  1.2  Agreement  means  a  written  agreement   (including  any
amendment or  supplement  thereto)  between the  Corporation  and a  Participant
specifying  the  terms  and  conditions  of an  Option  or SAR  granted  to such
Participant.

         ARTICLE 1.3 Board means the Board of Directors of the Corporation.

         ARTICLE 1.4 Code means the Internal  Revenue  Code of 1986,  as amended
from time to time, and any successor thereto.

         ARTICLE 1.5 Committee means the Compensation Committee of the Board or,
in the absence of such a committee, the Board.

         ARTICLE 1.6 Common Stock means the Common Stock of the Corporation, par
value $0.01 per share. 

         ARTICLE 1.7 Corporation means PerArdua Corporation.

         ARTICLE 1.8  Corresponding SAR means an SAR that is granted in relation
to a particular  Option and that can be exercised only upon the surrender to the
Corporation, unexercised, of that portion of the Option to which the exercise of
the SAR relates.

         ARTICLE 1.9 Fair Market Value means, on any given date, the fair market
value of a share of Common Stock  determined  by the Committee in good faith and
using any reasonable method.

         ARTICLE  1.10  Initial  Value  means,  with respect to an SAR, the Fair
Market Value of one share of Common Stock on the date of grant,  as set forth in
the Agreement.

         ARTICLE 1.11 Option  means a stock  option that  entitles the holder to
purchase  from the  Corporation a stated number of shares of Common Stock at the
price set forth in the Agreement.






         ARTICLE 1.12 Participant  means an employee of the Corporation or of an
Affiliate,  a  member  of  the  Board,  or a  consultant  or  other  independent
contractor providing services to the Corporation, who satisfies the requirements
of Article 4 and is selected by the Committee to receive an Option.

         ARTICLE 1.13 Plan means the PerArdua Corporation Stock Incentive Plan.

         ARTICLE  1.14 SAR means a stock  appreciation  right that  entitles the
holder to receive, with respect to each share of Common Stock encompassed by the
exercise  of such  SAR,  the  excess  of the  Fair  Market  Value at the time of
exercise  over the Initial Value of the SAR.  References to "SARs"  include both
Corresponding SARs and SARs granted independently of Options, unless the context
requires otherwise.

         ARTICLE 1.15 Ten Percent  Shareholder  means any individual owning more
than ten  percent  (10%) of the total  combined  voting  power of all classes of
stock of the Corporation or an Affiliate.  An individual  shall be considered to
own any voting stock owned  (directly  or  indirectly)  by or for his  brothers,
sisters,  spouse, ancestors or lineal descendants and shall be considered to own
proportionately  any voting  stock owned  (directly or  indirectly)  by or for a
corporation,  partnership,  estate  or  trust  of  which  such  individual  is a
shareholder, partner or beneficiary.


                                    ARTICLE 2
                                    PURPOSES

         The Plan is  intended  to assist  the  Corporation  in  recruiting  and
retaining key employees,  directors,  advisors and consultants  with ability and
initiative  by enabling  employees,  directors,  advisors  and  consultants  who
contribute  significantly  to the  Corporation or an Affiliate to participate in
its  future  success  and  to  associate  their  interests  with  those  of  the
Corporation and its shareholders. The Plan is intended to permit the issuance of
both  Options  qualifying  under  Section  422 of  the  Code  ("Incentive  Stock
Options")  and  Options not so  qualifying.  No Option that is intended to be an
Incentive  Stock  Option shall be invalid for failure to qualify as an Incentive
Stock Option.  The proceeds  received by the  Corporation for the sale of Common
Stock pursuant to this Plan shall be used for general corporate purposes.


                                    ARTICLE 3
                                 ADMINISTRATION

         The Plan shall be  administered  by the Committee.  If the  Corporation
registers securities under Section 12 of the Securities Exchange Act of 1934, as
amended  (the  "Exchange  Act"),  the  individuals  who serve as  members of the
Committee on and after the date of such  registration  shall be individuals each
of  whom  is  a  "Non-Employee  Director"  within  the  meaning  of  Rule  16b-3
promulgated  under  Section  16(b) of the  Securities  Exchange Act of 1934,  as
amended  (the  "Exchange  Act").  The  Committee  shall have  authority to grant
Options and SARs upon such terms 


                                      -2-




(not  inconsistent  with  the  provisions  of this  Plan) as the  Committee  may
consider  appropriate.  Such terms may include  conditions (in addition to those
contained in this Plan) on the exercisability of all or any part of an Option or
SAR. Notwithstanding any such conditions,  the Committee may, in its discretion,
accelerate  the time at which  any  Option  or SAR may be  exercised;  provided,
however,  that in the event such  acceleration  would result in Incentive  Stock
Options held by a Participant  first  becoming  exercisable  for shares having a
fair market value  (determined  on the date the Option was granted) in excess of
$100,000 in any calendar  year such excess  amount of Options  shall cease to be
Incentive Stock Options simultaneous with their acceleration.  In addition,  the
Committee  shall have  complete  authority to interpret  all  provisions of this
Plan; to prescribe the form of Agreements; to adopt, amend and rescind rules and
regulations  pertaining to the administration of the Plan; and to make all other
determinations  necessary or advisable for the  administration of this Plan. The
express grant in the Plan of any specific  power to the  Committee  shall not be
construed  as limiting any power or  authority  of the  Committee.  Any decision
made, or action taken, by the Committee or in connection with the administration
of this Plan shall be final and conclusive.  No member of the Committee shall be
liable  for  any act  done  in  good  faith  with  respect  to this  Plan or any
Agreement, Option or SAR. All expenses of administering this Plan shall be borne
by the Corporation.


                                    ARTICLE 4
                                   ELIGIBILITY

         ARTICLE 4.1 General.  Any  employee,  director,  member of the advisory
board,  independent  contractor  or  consultant  of  the  Corporation  or of any
Affiliate  (including  any  corporation  that  becomes  an  Affiliate  after the
adoption of this Plan) who, in the judgment of the  Committee,  has  contributed
significantly  or can be expected to contribute  significantly to the profits or
growth of the Company or an Affiliate may be granted one or more Options,  SARs,
or Options and SARs.

         ARTICLE 4.2 Grants.  The Committee will  designate  individuals to whom
Options  and SARs are to be  granted  and will  specify  the number of shares of
Common Stock  subject to each grant.  An Option may be granted with or without a
related SAR. A SAR may be granted with or without a related Option.  All Options
and SARs granted under the Plan shall be evidenced by Agreements  which shall be
subject to applicable  provisions  of this Plan and to such other  provisions as
the Committee may adopt. No Participant  may be granted  Incentive Stock Options
or related SARs (under all Incentive  Stock Option plans of the  Corporation and
Affiliates) which are first exercisable in any calendar year for stock having an
aggregate  Fair Market  Value  (determined  as of the date an option is granted)
exceeding $100,000. The preceding annual limitation shall not apply with respect
to Options that are not Incentive Stock Options.



                                      -3-



                                    ARTICLE 5
                            STOCK SUBJECT TO OPTIONS

         Upon the exercise of any Option or  Corresponding  SAR, the Corporation
may deliver to the Participant authorized but unissued Common Stock. The maximum
aggregate  number  of  shares of Common  Stock  that may be issued  pursuant  to
Options and  Corresponding  SARs granted under this Plan is 500,000,  subject to
adjustment as provided in Article 9. If an Option is  terminated or expires,  in
whole or in part,  for any reason  other than its  exercise or the exercise of a
Corresponding  SAR, the number of shares of Common Stock allocated to the Option
or  portion  thereof  may  be  reallocated  to  other  Options  or  Options  and
Corresponding SARs to be granted under this Plan.


                                    ARTICLE 6
                                  OPTION PRICE

         The price per share for Common  Stock  purchased  on the exercise of an
Option shall be determined by the Committee on the date of grant.  The price per
share for Common  Stock  purchased  on the  exercise  of any  Option  that is an
Incentive  Stock Option shall not be less than the Fair Market Value on the date
the Option is granted; provided,  however, that the price per share shall not be
less than 110% of the Fair Market Value in the case of an Incentive Stock Option
that is granted to a Ten Percent Shareholder.


                                    ARTICLE 7
                               EXERCISE OF OPTIONS

         ARTICLE 7.1 Maximum  Option or SAR Period.  The maximum period in which
an Option or SAR may be exercised  shall be  determined  by the Committee on the
date of grant.  No Option that is an Incentive Stock Option or related SAR shall
be  exercisable  after the  expiration  of 10 years from the date the Option was
granted or 5 years in the case of an Incentive  Stock Option or related SAR that
was  granted to a Ten  Percent  Shareholder.  The terms of any Option or SAR may
provide that it is exercisable for a period less than such maximum periods.

         ARTICLE 7.2  Non-Transferability.  Any Option or SAR granted under this
Plan  shall be  non-transferable  except by will or by the laws of  descent  and
distribution.  In the event of any such transfer, the Option and any related SAR
must be  transferred  to the same person or persons.  During the lifetime of the
Participant  to whom the  Option  or SAR is  granted,  the  Option or SAR may be
exercised only by the Participant.  No right or interest of a Participant in any
Option or SAR shall be liable  for,  or  subject  to, any lien,  obligation,  or
liability of such Participant.


                                      -4-



         ARTICLE  7.3  Employee   Status.   For  purposes  of  determining   the
applicability  of Section 422 of the Code (relating to Incentive Stock Options),
or in the event  that the  terms of any  Option  or SAR  provide  that it may be
exercised  only during  employment  or within a  specified  period of time after
termination  of  employment,  the  Committee may decide to what extent leaves of
absence for governmental or military service,  illness,  temporary disability or
other reasons shall not be deemed interruptions of continuous employment.

         ARTICLE 7.4 General  Restriction.  Each Participant shall, prior to the
exercise of any Option, deliver to the Corporation any reasonable information in
order for the Corporation to be able to satisfy itself that the shares of Common
Stock  issuable upon  exercise of an Option will be acquired in accordance  with
the  terms  of  an  applicable   exemption  from  the  securities   registration
requirements  of applicable  federal and state  securities  law. With respect to
Options that are not Incentive  Stock Options and without  limiting the scope of
the  Corporation's  or  the  Committee's  discretion  to  withhold  approval  or
otherwise  administer this Plan, approval may be withheld to the extent that the
exercise,  either individually or in the aggregate together with the exercise of
other previously exercised Options and/or offers and sales pursuant to any prior
or contemplated offering of securities, would, in the sole and absolute judgment
of the  Corporation,  require the filing of a  registration  statement  with the
United  States  Securities  and  Exchange  Commission  or  with  the  securities
commission of any state.  The  Corporation  shall avail itself of any exemptions
from  registration  contained in applicable  federal and state  securities  laws
which are reasonably  available to the  Corporation on terms which,  in its sole
and  absolute  discretion,  it deems  reasonable  and not unduly  burdensome  or
costly.  If an Option which is not an Incentive Stock Option cannot be exercised
at the time it would otherwise expire due to the restrictions  contained in this
Section,  the exercise  period for that Option shall be extended for  successive
one-year  periods  until that Option can be  exercised in  accordance  with this
Section.


                                    ARTICLE 8
                               METHOD OF EXERCISE

         ARTICLE 8.1 Exercise.  Subject to the  provisions of Articles 7 and 11,
an Option or SAR may be  exercised  in whole at any time or in part from time to
time at such times and in  compliance  with such  requirements  as the Committee
shall determine;  provided, however, that an SAR that is related to an Incentive
Stock  Option may be  exercised  only to the extent that the  related  Option is
exercisable  and when the Fair  Market  Value  exceeds  the option  price of any
related Option.  Any Option or SAR granted under this Plan may be exercised with
respect to any number of whole  shares  less than the full  number for which the
Option or SAR could be  exercised.  Such  partial  exercise  of an Option or SAR
shall not  affect the right to  exercise  the Option or SAR from time to time in
accordance with this Plan with respect to remaining shares subject to the Option
or related to the SAR.  The  exercise of either an Option or  Corresponding  SAR
shall  result in the  termination  of the other to the  extent of the  number of
shares with respect to which the Option or Corresponding SAR is exercised.



                                      -5-



         ARTICLE  8.2  Payment.  Unless  otherwise  provided  by the  Agreement,
payment of the option price shall be made in cash or cash equivalent  acceptable
to the  Committee.  If the  Agreement  provides,  payment  of all or part of the
option  price  may be  made  by  surrendering  shares  of  Common  Stock  to the
Corporation. If Common Stock is used to pay all or part of the option price, the
shares  surrendered  must have a Fair  Market  Value  (determined  as of the day
preceding  the  date of  exercise)  that is not  less  than  such  price or part
thereof.

         ARTICLE 8.3  Determination  of Payment of Cash and/or Common Stock Upon
Exercise of SAR. At the Committee's  discretion,  the amount payable as a result
of the exercise of an SAR may be settled in cash, Common Stock, or a combination
of cash and Common Stock.  No  fractional  shares will be  deliverable  upon the
exercise of an SAR but a cash payment will be made in lieu thereof.

         ARTICLE 8.4 Shareholder Rights. No Participant shall have any rights as
a shareholder  with respect to shares subject to his Option or SAR until (i) the
Option or SAR shall have been exercised pursuant to the terms thereof,  (ii) all
requirements  under applicable law and regulations shall have been complied with
to the satisfaction of the Corporation,  (iii) the Corporation shall have signed
and delivered a stock certificate representing the shares to the Participant and
(iv) the  Participant's  name shall have been entered as a stockholder of record
on the books of the Corporation.


                                    ARTICLE 9
                     ADJUSTMENT UPON CHANGE IN COMMON STOCK

         Should  the  Corporation  effect  one or more  stock  dividends,  stock
split-ups,  subdivisions or consolidations of shares or other similar changes in
capitalization,  then the maximum  number of shares as to which Options and SARs
may be granted under this Plan shall be  proportionately  adjusted and the terms
of Options and SARs shall be adjusted as the  Committee  shall  determine  to be
equitably required. Any determination made under this Article 9 by the Committee
shall be final and conclusive.

         This issuance by the  Corporation  of shares of stock of any class,  or
securities  convertible  into shares of stock of any class, for cash or property
or for labor or services, either upon direct sale or upon the exercise of rights
or warrants to subscribe  therefor,  or upon conversion of shares of obligations
of the Corporation  convertible into such shares or other securities,  shall not
affect,  and no  adjustment  by reason  thereof  shall be made with  respect to,
Options or SARs.


                                      -6-



                                   ARTICLE 10
                                CHANGE IN CONTROL

         ARTICLE  10.1   Definition   of  Change  in  Control.   The   following
transactions constitute "Change of Control" events:

                  a. the  adoption of a plan of merger or  consolidation  of the
Corporation  with any other  corporation as a result of which the holders of the
outstanding  voting stock of the  Corporation as a group would receive less than
50% of the voting stock of the surviving or resulting corporation;

                  b. the  adoption of a plan of  liquidation  or the approval of
the dissolution of the Corporation;

                  c. the sale or transfer of substantially  all of the assets of
the Corporation; or

                  d. the transfer of more than 50% of the issued and outstanding
shares of Common Stock  pursuant to a tender offer or exchange  offer for shares
of  Common  Stock  other  than  any such  offer  made by the  Corporation  or an
Affiliate.

         ARTICLE 10.2 Effect on Outstanding  Options and SARs. In the event of a
Change in Control of the Corporation,  the Committee, as constituted before such
Change in Control,  in its sole discretion may, as to any outstanding  Option or
SAR,  either at the time the Option or SAR is  granted  or any time  thereafter,
take any one or more of the following actions:  (i) provide for the acceleration
of any time periods  relating to the exercise or  realization of any such Option
or SAR so that such  Option or SAR may be  exercised  or  realized in full on or
before a date initially fixed by the Committee; (ii) provide for the purchase or
settlement  of any such Option or SAR by the Company for an amount of cash equal
to the amount which could have been obtained upon the exercise of such Option or
SAR or  realization  of such  Participant's  rights had such  Option or SAR been
currently exercisable or payable;  (iii) make such adjustment to any such Option
or SAR then  outstanding  as the  Committee  deems  appropriate  to reflect such
Change in Control;  or (iv) cause any such Option or SAR then  outstanding to be
assumed,  or new rights  substituted  therefor,  by the  acquiring  or surviving
corporation in such Change in Control.

         ARTICLE  10.3 Notice.  Holders of Options will be mailed  notice of any
anticipated  transaction described in Section 10.1 at least 20 days prior to the
occurrence of such event.


                                   ARTICLE 11
                             COMPLIANCE WITH LAW AND
                          APPROVAL OF REGULATORY BODIES

         No Option or SAR shall be exercisable, no Common Stock shall be issued,
no  certificates  for shares of Common Stock shall be delivered,  and no payment
shall be made under this Plan except in compliance  with all applicable  federal
and state laws and regulations (including,  without limitation, 


                                      -7-



withholding tax  requirements)  and the rules of all domestic stock exchanges on
which the  Corporation's  shares may be listed.  The Corporation  shall have the
right to rely on an opinion  of its  counsel  as to such  compliance.  Any share
certificate  issued  to  evidence  Common  Stock  for  which an Option or SAR is
exercised  may bear  such  legends  and  statements  as the  Committee  may deem
advisable to assure  compliance with federal and state laws and regulations.  No
Option  or SAR  shall be  exercisable,  no  Common  Stock  shall be  issued,  no
certificate  for shares shall be  delivered,  and no payment shall be made under
this Plan until the  Corporation  has  obtained  such consent or approval as the
Committee may deem advisable from  regulatory  bodies having  jurisdiction  over
such  matters.  The  exercise  of any  Option  granted  under  this  Plan  shall
constitute  a  Participant's  full and complete  consent to whatever  action the
Committee  deems  necessary  to satisfy any  federal  and state tax  withholding
requirements which the Committee, acting in its discretion,  deems applicable to
such exercise.


                                   ARTICLE 12
                               GENERAL PROVISIONS

         ARTICLE 12.1 Effect on  Employment.  Neither the adoption of this Plan,
its  operation,  nor any documents  describing or referring to this Plan (or any
part thereof) shall confer upon any employee any right to continue in the employ
of the  Corporation  or an Affiliate or in any way affect any right and power of
the  Corporation  or an Affiliate to terminate the  employment of an employee at
any time with or without assigning a reason thereunder.

         ARTICLE  12.2  Unfunded  Plan.  The Plan,  insofar as it  provides  for
grants,  shall  be  unfunded,  and the  Corporation  shall  not be  required  to
segregate  any assets that may at any time be  represented  by grants under this
Plan.  Any liability of the  Corporation to any person with respect to any grant
under this Plan shall be based solely upon any contractual  obligations that may
be created pursuant to this Plan. No such obligation of the Corporation shall be
deemed to be secured by any pledge of, or other  encumbrance on, any property of
the Corporation.

         ARTICLE 12.3 Rules of Construction.  Headings are given to the articles
and sections of this Plan solely as a convenience to facilitate  reference.  The
reference  to any  statute,  regulation,  or  other  provision  of law  shall be
construed to refer to any amendment to or successor of such provision of law.

         ARTICLE  12.4  Section  16.  This Plan is  intended  to comply with all
aspects  of  Section  16 of the  Exchange  Act and  the  rules  and  regulations
promulgated  thereunder in the event the Corporation  shall register  securities
under Section 12 of the Exchange Act. To the extent any provision of the Plan or
action by the Committee fails to so comply,  it shall be deemed null and void to
the extent permitted by law and deemed advisable by the Committee.



                                      -8-




                                   ARTICLE 13
                                    AMENDMENT

         The Board may amend from time to time or terminate this Plan; provided,
however,  that no amendment may become effective until  shareholder  approval is
obtained if the amendment (i) increases the aggregate  number of shares that may
be issued  pursuant to Options and SARs,  (ii) reduces the option  price,  (iii)
changes the class of employees who may be granted Incentive Stock Options,  (iv)
changes the class of  employees,  directors  or  consultants  eligible to become
Participants,   or  (v)  in  some  other  way  confers  a  material  benefit  on
Participants.  No amendment shall,  without a Participant's  consent,  adversely
affect any rights of such Participant under any Option or SAR outstanding at the
time such amendment is made.


                                   ARTICLE 14
                                DURATION OF PLAN

         No Option or SAR may be  granted  under  this Plan  after July 1, 2006.
Options and SARs granted before that date shall remain valid in accordance  with
their terms.


                                   ARTICLE 15
                          INDEMNIFICATION OF COMMITTEE

         In addition to such other rights of indemnification  that they may have
as directors of the  Corporation or as members of the Committee,  the members of
the Committee  shall be  indemnified by the  Corporation  against the reasonable
expenses,  including  attorneys'  fees,  actually  and  necessarily  incurred in
connection with the defense of any action, suit or proceeding,  or in connection
with any appeal  therein,  to which they or any of them may be a party by reason
of any action  taken or failure to act under or in  connection  with the Plan or
any  Option  granted  thereunder,  and  against  all  amounts  paid  by  them in
settlement  thereof  (provided the settlement is approved by  independent  legal
counsel  selected  by the  Corporation)  or paid by  them in  satisfaction  of a
judgment in any such action,  suit or proceeding,  except in relation to matters
as to which it shall be  adjudged  in the action,  suit or  proceeding  that the
Committee  member is liable for  negligence or misconduct in the  performance of
his or her duties; provided that within sixty (60) days after institution of the
action,  suit or  proceeding  a  Committee  member  shall in  writing  offer the
Corporation the opportunity, at its own expense, to handle and defend it.



                                      -9-



                                   ARTICLE 16
                             EFFECTIVE DATE OF PLAN

         Options  and SARs may be granted  under this Plan upon its  adoption by
the Board,  provided that no Option or SAR will be effective unless this Plan is
approved (at a duly held  shareholders'  meeting  within  twelve  months of such
adoption) by shareholders  holding a majority of the  Corporation's  outstanding
voting stock.


                                      -10-




                                                                    EXHIBIT 23.1

                      CONSENT OF INDEPENDENT AUDITORS


    We hereby consent to the use in this  Registration  Statement of our report,
dated January 24, 1997, except for Note 6 as to which the date is April 9, 1997,
relating  to  the  financial  statements  of  PerArdua  Corporation,  and to the
reference to our Firm under the caption "Experts" in the Prospectus.


                                                   MCGLADREY & PULLEN, LLP

Richmond, Virginia
April 18, 1997


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<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                              NOV-30-1996
<PERIOD-START>                                 DEC-01-1996
<PERIOD-END>                                   FEB-28-1997
<CASH>                                         213029
<SECURITIES>                                   0
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                          0
                                    0
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<TOTAL-LIABILITY-AND-EQUITY>                   502625
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