SHAMAN PHARMACEUTICALS INC
S-1/A, 1999-06-02
PHARMACEUTICAL PREPARATIONS
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     As Filed with the Securities and Exchange Commission on June 2, 1999
                                                     Registration No. 333-______


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


                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                 ---------------
                                 AMENDMENT NO. 1
                                       TO
                                    FORM S-1
                                 ---------------
                             REGISTRATION STATEMENT


                                      Under
                           The Securities Act of 1933
                                 ---------------

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

               Delaware                              94-3095806
   (State or other jurisdiction of                (I.R.S. Employer
    Incorporation or organization)             Identification Number)

                              213 East Grand Avenue
                   South San Francisco, California 94080-4812
                                 (650) 952-7070
    (Address, including zip code, and telephone number, including area code,
                of the Registrant's principal executive offices)

                                  LISA A. CONTE
                      President and Chief Executive Officer
                          Shaman Pharmaceuticals, Inc.
                              213 East Grand Avenue
                   South San Francisco, California 94080-4812
                                 (650) 952-7070
            (Name, address, including zip code, and telephone number,
              including area code, of agent for service of process)

                                   Copies to:
                                Donald C. Reinke
                                Bruce P. Johnson
                            Bay Venture Counsel, LLP
                        1999 Harrison Street, Suite 1300
                            Oakland, California 94612
                                  510-273-8750

        Approximate date of commencement of proposed sale to the public: As soon
  as practicable after this Registration Statement becomes effective.
                                ---------------

    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, 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 this Form is a post-effective amendment filed pursuant to Rule 462(d)
  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 said Section 8(a), may determine.
================================================================================


<PAGE>


               Subject to Completion, Dated ________________, 1999

        7,500,000 Rights to Purchase Series R Convertible Preferred Stock

            7,500,000 Shares of Series R Convertible Preferred Stock

                          SHAMAN PHARMACEUTICALS, INC.

We are offering to sell up to 7,500,000 shares of our Series R Convertible
Preferred Stock to all persons who were owners of our common stock on
_____________, 1999, and an indeterminate number of shares of our common
stock as may be issuable upon conversion of the Series R Convertible
Preferred Stock or as a result of stock splits, stock dividends and other
similar transactions.   This offering is not being underwritten.


Each share of Series R Preferred Stock will automatically convert on February
1, 2000 into a number of shares of common stock equal to $2.00 divided by the
conversion price then in effect, which shall be equal to the lesser of
$_____ (which is equal to 10% of the average closing sales price of our
common stock as reported on the OTC Bulletin Board for the 10 trading days
ending three trading days prior to the date of this prospectus), or the price
that is equal to 10% of the average closing sales price of our common stock
for the 10 trading days ending three trading days prior to February 1, 2000.
The Series R Preferred Stock will be entitled to receive dividends only to
the extent that our common stock is entitled to receive dividends.  In the
event of liquidation, dissolution or winding up of Shaman, the holders of the
Series R Preferred Stock are entitled to receive, in preference to the
holders of the common stock but after payment of the liquidation preferences
of any outstanding shares of Series A Preferred Stock, Series C Preferred
Stock, and Series D Preferred Stock, an amount equal to $2.00 per share.
Each share of Series R Preferred  Stock will have the right to vote on all
matters submitted or required to be submitted to the vote of the stockholders
and shall have 10 votes per share.



If you owned common stock on ______________, 1999, the record date for this
offering, you will receive, at no cost, a right to buy ___ shares of Series R
Preferred Stock at a price of $2.00 per share for each share of common stock
that you owned on this record date.  This right is called the basic
subscription privilege.  If you decide to elect to purchase all of the shares
that you are eligible to purchase, you may also request to buy additional
shares of Series R Preferred Stock at the same price as the basic
subscription privilege.  This right is called the over-subscription
privilege.  We will not issue rights for fractional shares of Series R
Preferred Stock and we will not issue cash in lieu of fractional rights.  You
must purchase a minimum of 50 shares of Series R Preferred Stock to
participate, and if you hold fewer than ___ shares of common stock on the
record date, you will be allowed to purchase 50 shares of Series R Preferred
Stock, which will be considered your basic subscription privilege.


The right to purchase these shares is exercisable beginning on the date of
this prospectus and continuing until 5:00 p.m. Eastern Daylight Savings Time
on July ___, 1999.  If you wish to participate in this offering, we recommend
that you follow the instructions set forth in this document and that you
submit all subscription documents to the subscription agent at least 10 days
before the deadline.  All subscriptions will be held in escrow by our
subscription agent, BankBoston, N.A., until accepted by Shaman. We reserve
the right to cancel or extend the subscription rights offering at any time
before the expiration date.

There is no minimum number of shares that we must sell in order to complete
the rights offering.  Stockholders that do not participate in the rights
offering will continue to own the same number and type of shares currently
held, but will own a smaller percentage of the total number of shares
outstanding.  The exact amount of this share dilution will depend on the
number of shares of Series R Preferred Stock sold in the offering.  Your
subscription rights are not transferable and will not be listed for trading
on any stock exchange.

Our common stock is traded on the Over-the-Counter Electronic Bulletin Board
under the symbol "SHMN."  On April 30, 1999, the last sale price for the
common stock as quoted on the OTC Bulletin Board was $0.14 per share.  We
have applied for approval for quotation of the Series R Preferred Stock on
the OTC Bulletin Board under the symbol "SHMNO,"  and expect that these
preferred shares will trade prior to their conversion to common stock on
February 1, 2000.
                                --------------

You should carefully consider the risk factors beginning on page __ before
purchasing any of the Series R Convertible Preferred Stock.
                               ---------------

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.


          The date of this prospectus is _____________________, 1999


The information in this prospectus is not complete and may be changed. We may
not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective and all consents have been
obtained from the relevant state securities commissions. We are not offering to
sell these securities and we are not soliciting an offer to buy these securities
in any state where the offer or sale is not permitted.


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<PAGE>







                      [This Page Intentionally Left Blank]





                                       2
<PAGE>





                               PROSPECTUS SUMMARY

      This summary highlights information contained elsewhere in this
prospectus. You should read the entire prospectus, including "Risk Factors" and
the financial statements, carefully before making an investment decision.

      All information contained in this prospectus reflects a 1-for-20 reverse
stock split of the common stock effected on June ___, 1999.

                                   Our Company

Our Business, Strategy and Products


      We are focused on the discovery, development, and marketing of novel,
proprietary botanical dietary supplements derived from tropical plant sources.
We intend to develop and commercialize our Shaman-branded products through our
recently established division, ShamanBotanicals.com. We also have available for
out-licensing a pipeline of botanical product candidates, as well as novel
pharmaceutical products for major human diseases developed by isolating active
compounds from tropical plants with a history of medicinal use.

      In 1997, the U.S. dietary supplement market was $12.9 billion, of which
over $4.0 billion was comprised of herbal or botanical dietary supplements. In
1998, this number was projected to reach $5.0 billion, with a compounded yearly
growth rate of 15% to 25%. In 1997, 24% of people within U.S. households
reported using botanical dietary supplements. The growth of this market has been
led by consumers who are interested in complementary, non-pharmaceutical options
for treating symptoms, fulfilling unmet dietary needs, and optimizing health,
either as an alternative to, or in conjunction with, more conventional medical
approaches. We believe that the use of these products will continue to expand
based upon the aging of the U.S. population, increasing scientific evidence and
acceptance by the conventional medical establishment, and the recent entrance of
powerful consumer companies which provide greater product confidence, while
broadening the base of consumer users.

      The unique positioning of our botanicals business stems from our
significant financial investment, our prior pharmaceutical product candidates,
more than 10 years of extensive field research by our teams of ethnobotanists
and physicians, and pharmaceutical-level chemical standardization, and
biological and clinical testing. We are applying this methodology to our new
industry, and we intend to set a new standard in this industry. In the last
decade, we have amassed a large body of information on the health benefits of
thousands of tropical plant species that have a history of human use and have
organized this information into an extensive relational database. This database
includes information on over 2,600 tropical plants, many of which have not been
introduced or fully developed in the U.S. dietary supplement market. We have
identified plants with a documented ethnomedical history of use in our library
and database of botanicals for use in key market categories with significant
commercial potential. Because many of these plants reflect the previously
untapped plant diversity of the rainforests, many represent novel botanical
products that have the opportunity to attain a strong, proprietary market
position. We currently have a fully-developed product, SB-300, and we expect to
commercialize this product in the near future by applying the funds raised in
this rights offering and raised through partnering development agreements we are
working to put in place.

      We have the opportunity to differentiate our product candidates in
consumers' minds relative to those of our competitors. Key points of
differentiation include:


        - Novel plants/products for unmet needs;
        - Documented, first-hand field experience with traditional use;
        - Rainforest-based plants and products (most botanical suuplement
          products currently come from plants found in temperate areas);
        - Our commitment to conservation and reciprocity;
        - Sustainable sourcing and supply;
        - Quality manufactured, standardized products; and
        - Clinically-tested products.


      We have identified multiple areas of dietary supplement product interest
and have identified specific priority product candidates. Some of these proposed
product areas include gastrointestinal relief, energy boosters, sexual function
aids, antioxidants, sleeping aids, calming agents and weight management. We have
developed two product lines, the Croton line and the EthnoEssentials line, with
products to address these areas.

      Our marketing strategy for dietary supplements involves a step-wise
product introduction and distribution approach. First, we plan to launch our
first product, SB-300. This product prevents fluid loss and promotes normal
bowel function. We intend to market the product to the HIV/AIDS Community for
people with chronic diarrhea. We will target this market through the Internet,

                                        3
<PAGE>

on our web site, ShamanBotanicals.com, and through direct response marketing. We
may also market SB-300 to the acute watery diarrhea or traveler's diarrhea
markets, again through the Internet, possibly in conjunction with an Internet
site partner. We also plan to partner and possibly co-brand with first-rate,
quality partners in the three key growth channels of distribution: mass market,
Internet, and multi-level (or network) marketing. Finally, building on the
expected growing recognition of the Shaman brand name (to be built in the future
by product introduction), we plan to broaden our Internet presence both within
the HIV/AIDS niche and beyond to include a full line of Shaman Botanicals, and
will also explore niche retail opportunities.

      The customer base for dietary supplements in the United States is growing.
In recent consumer surveys conducted by Hartman/New Hope and Nutrition Business
Journal, 25% to 30% of consumers report having used an herbal or botanical
dietary supplement, and 36% report moderate to heavy use of complementary
medicine. We believe that our Botanicals business has two key initial classes of
customers: consumers, primarily in the HIV/AIDS Community and the travelers
market, who could purchase our first product, SB-300, designed to prevent fluid
loss and normalize bowel function; and mass market, Internet and multi-level
companies that may be interested in licensing or partnering with us for the
commercialization of our products.

Our History


      Until December 1998, we were solely focused on developing pharmaceuticals
products derived from tropical plant sources. Our pharmaceutical business model
was dependent upon our ability to launch our first pharmaceutical product in
1999. As a result of the U.S. Food and Drug Administration response to our
proposed fast-track (single-pivotal trial) New Drug Application package for our
leading pharmaceutical product candidate, SP-303/Provir, and insufficient
resources to continue the costly process of conducting a second pivotal trial
which would have created significant delays, we restructured our business to
focus on the development and marketing of dietary supplements. As a result, we
now have available for out-licensing our pipeline of novel pharmaceutical
product candidates for major human diseases developed by isolating active
compounds from tropical plants with a history of medicinal use.


      We were incorporated in California in May 1989, began operations in March
1990 and reincorporated in Delaware in January 1993. Our address is 213 East
Grand Avenue, South San Francisco, California, 94080-4812 and our telephone
number is (650) 952-7070. Our web site is located at http://www.shaman.com.
Information contained on our web site does not constitute part of this
prospectus.

      Provir(TM), SP-303(TM), EthnoEssentials(TM), SB-300(TM),
ShamanBotanicals.com(TM), and our stylized logo are trademarks of Shaman.
Shaman Pharmaceuticals(R) is a registered U.S. trademark of Shaman.



                         Summary of the Rights Offering

Series R Convertible Preferred
Stock offered by Shaman........  7,500,000 shares at $2.00 per share offered
                                 on a pro-rata "rights offering" basis to
                                 all owners of shares of our common stock on
                                 ___________, 1999.

Preferred Stock outstanding
after the offering.............  Up to 7,500,000 shares of Series R Convertible
                                 Preferred Stock
                                 400,000 shares of Series A Convertible
                                 Preferred Stock
                                 115,958 shares of Series C Convertible
                                 Preferred Stock
                                 1,898 shares of Series D Convertible
                                 Preferred Stock

Common stock outstanding after
the offering.................... 2,226,852 shares

                                 This number is based on shares outstanding as
                                 of April 30, 1999 and excludes (i) 73,676
                                 shares of common stock subject to outstanding
                                 options under our stock option plans; (ii)
                                 104,833 shares reserved for issuance for
                                 outstanding warrants; (iii) 27,157 shares
                                 reserved for issuance upon the conversion of
                                 Series A Preferred Stock; (iv) an estimate
                                 4,529,609 shares reserved for issuance upon the
                                 conversion of Series C Convertible Preferred
                                 Stock; and (v) an estimated  2,635,432 shares
                                 reserved for issuance upon the conversion of
                                 Series D Convertible Preferred Stock and (vi)
                                 approximately 55,335,650 shares reserved for
                                 issuance upon the conversion of the Series R
                                 Preferred Stock being offered hereby and the
                                 shares of Series R Preferred Stock reserved for
                                 issuance upon exercise of outstanding warrants
                                 (based upon a conversion price of the Series R
                                 Preferred Stock of $0.30).



                                       4
<PAGE>




Use of proceeds................  We intend to use approximately $1 million of
                                 the funds generated by this rights offering to
                                 repay any amount incurred under the debt
                                 agreement entered into in April 1999, fund the
                                 initial commercialization of our first product
                                 SB-300 (approximately $2.5 million for initial
                                 launch), pursue development, production and
                                 marketing of our botanicals products, and for
                                 working capital, including significant current
                                 liabilities and general purposes.

Description of Series R
Convertible Preferred Stock....  The Series R Preferred Stock will automatically
                                 convert into shares of common stock on February
                                 1, 2000. The following is the formula which
                                 will be used to calculate the conversion of
                                 Series R Preferred Stock: $2.00 divided by the
                                 the conversion price equals the number of
                                 common stock shares into which the Series R
                                 R Preferred Stock is convertible.  The
                                 conversion price will be equal to the lower of
                                 $_______, which is equal to 10% of the average
                                 closing sales price of our common stock on the
                                 OTC Bulletin Board for the 10 trading days
                                 ending three trading days prior to the date of
                                 this prospectus, or a per share price that is
                                 equal to 10% of the average closing sales price
                                 of our common stock for the 10 trading days
                                 ending three trading days prior to February 1,
                                 2000.

                                 The Series R Preferred Stock will be entitled
                                 to receive dividends only to the extent that
                                 out common stock is entitled to receive
                                 dividends. In the event of liquidation,
                                 dissolution or  winding up of Shaman, the
                                 holders of the Series R Preferred Stock are
                                 entitled to receive, in  preference to the
                                 holders of the common stock but after payment
                                 of the liquidation preferences of any
                                 outstanding shares of Series A Preferred Stock,
                                 Series C Preferred Stock, and Series D
                                 Preferred Stock, an amount equal to $2.00 per
                                 share.  Each share of Series R Preferred Stock
                                 will have the right to vote on all matters
                                 submitted or required to be submitted to the
                                 vote of the stockholders and shall have 10
                                 votes per share.

Eligible stockholders..........  Only persons who owned shares of our common
                                 stock on _________________, 1999 will be
                                 eligible to purchase shares of Series R
                                 Preferred Stock in the rights offering.

Subscription rights............  If you are an eligible stockholder, you
                                 will have two subscription rights:

                                 (1) Basic subscription privilege. If you held
                                 common stock on  ____________,  1999, then you
                                 will have the right to  purchase ___ shares of
                                 Series R Preferred  Stock at a price of $2.00
                                 per share, for each share of common stock you
                                 owned as of  ____________, 1999.  We require a
                                 minimum subscription of 50 shares of Series R
                                 Preferred Stock or $100.  This means that if
                                 you hold fewer than ____ shares of common stock
                                 on the record date, you will be allowed to
                                 purchase 50 shares of Series R Preferred Stock
                                 to meet the minimum subscription requirement,
                                 which will be considered your basic
                                 subscription privilege.

                                 (2) Over-subscription privilege. If you elect
                                 to purchase all of the shares that you are
                                 eligible to purchase in your basic subscription
                                 privilege, you may also request to buy
                                 additional shares. In exercising this
                                 over-subscription privilege, you must specify
                                 the maximum number of shares of Series R
                                 Preferred Stock that you are willing to buy at
                                 $2.00 per share.

                                 We will round up to the nearest whole number in
                                 determining the number of shares that we will
                                 issue to each stockholder pursuant to these
                                 rights.

Non-transferability of
subscription rights............  Your basic subscription and over-subscription
                                 rights are not transferable.



                                       5
<PAGE>



Allocation of shares...........  If we receive subscriptions for more shares
                                 than are being offered, we will allocate shares
                                 first to those stockholders who are exercising
                                 their basic subscription privilege.  We will
                                 then allocate the remaining shares among those
                                 who exercise the over-subscription privilege,
                                 in proportion to the maximum number of shares
                                 that each subscriber offers to purchase above
                                 his basic subscription privilege.

Payment for shares............   Payment for shares may be made by delivery of
                                 cash, money order, wire transfer or, for
                                 certain  stockholders,  cancellation of
                                 existing debt.

How to subscribe...............  You should carefully complete and sign the
                                 subscription agreement enclosed with this
                                 prospectus and forward it to BankBoston,
                                 N.A., our subscription agent, whose address
                                 appears below.  Be sure to include with
                                 your subscription agreement a check or
                                 money order for the full amount of your
                                 subscription price, including any shares
                                 for which you have over-subscribed, unless
                                 you choose to pay by wire transfer or, if
                                 approved by Shaman in its sole discretion, by
                                 cancellation of debt.  Checks and money
                                 orders will be cashed and held in escrow by
                                 our subscription agent, but will not be
                                 distributed to Shaman until we accept your
                                 subscription in whole or in part.  If your
                                 subscription is accepted in part due to
                                 over-subscription, the subscription agent
                                 will forward to you a check for the
                                 difference. No interest will be paid on the
                                 funds submitted for subscription.

Cancellation of subscription...  Once you have submitted your subscription
                                 documents, your exercise of subscription
                                 rights may not be revoked.

Delivery of subscription
documents......................  Subscription documents should be delivered to:

                                   BankBoston, N.A.
                                   40 Campanelli Drive
                                   Braintree, Massachusetts, 02184

Persons wishing to exercise
for the benefit of others......  Brokers, banks, trustees and other
                                 individuals or entities that hold common
                                 stock for the benefit of others may, if
                                 authorized by the beneficial owner, complete
                                 the subscription agreement and submit it to the
                                 subscription agent with the proper payment.

Delivery of certificates for
Series R Convertible Preferred
Stock.........................   Certificates representing shares of Series
                                 R Convertible Preferred Stock will be
                                 delivered to subscribers as soon as practicable
                                 after your basic subscription has been
                                 accepted, which may occur at any time prior to
                                 the expiration of this offering. We may accept
                                 your basic subscription amount prior to
                                 accepting your over-subscription amount. In
                                 that event, we will deliver stock certificates
                                 for the basic subscription amount, and the
                                 subscription agent will retain the over
                                 subscription amount in escrow until the
                                 expiration of this offering. At that time, we
                                 will determine the amount of the
                                 over-subscription to be accepted for each
                                 stockholder, and will issue stock certificates
                                 and refund any balance due to the stockholders.
                                 We expect that this may take two weeks or
                                 longer following our acceptance of your
                                 subscription, due to the need to allow checks
                                 for subscription funds to clear.

Certain federal income tax
consequences..................   Your receipt or exercise of the
                                 subscription rights should not be treated
                                 as a taxable event for United States
                                 federal income tax purposes, but may have
                                 other tax effects.




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<PAGE>


Expiration date of rights
offering.....................    July ____, 1999, at 5:00 p.m. Eastern
                                 Daylight Savings Time, unless extended by
                                 Shaman in its sole discretion.


Termination of offering......    We may cancel this offering at any time. If
                                 we cancel the offering, we will return your
                                 subscription payment without interest.

Proposed OTC Bulletin Board
trading  symbol for the
Series R Convertible
Preferred Stock.............     SHMNO

Questions regarding the
offering....................     If you have any questions about this
                                 offering, including questions about
                                 subscription procedures and requests for
                                 additional copies of this prospectus or other
                                 documents, please contact:

                                 Shareholder Communications Corporation
                                 17 State Street
                                 New York,  NY 10004
                                 Stockholders may also telephone at
                                 1-800-546-8622, and banks and brokers may
                                 telephone at 1-212-805-7113.




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<PAGE>


                          Summary Financial Information


     We are providing the following information to aid you in the analysis of
the offering. We derived the information for the years ended December 31, 1996,
1997 and 1998 from our audited financial statements for 1996 through 1998 which
are included elsewhere in this prospectus. We derived the unaudited information
for the quarters ended March 31, 1998 and 1999 and at March 31, 1999 (actual)
from unaudited financial statements which are not included in this prospectus.
In the opinion of management, the unaudited financial statements include, all
adjustments (consisting of normal recurring adjustments) considered necessary
for a fair presentation. The results of operations for the interim periods shown
herein are not necessarily indicative of operating results for the entire year.
This information is only a summary and you should read it in conjunction with
Shaman's financial statements (and related notes) and Management's Discussion
and Analysis of Financial Condition and Results of Operations included elsewhere
in this prospectus and contained in annual reports, quarterly reports and other
information on file with the Securities and Exchange Commission.


<TABLE>

<CAPTION>
Statement of Operations Data
(in thousands, except per share data)


                                                       Year Ended December 31,            Three Months Ended March 31,
                                                  ---------------------------------      -----------------------------
                                                    1996         1997        1998              1998         1999
                                                  --------     --------    --------          --------     --------

<S>                                              <C>          <C>         <C>                <C>          <C>

 Revenue from collaborative agreements            $  3,406     $  3,500    $  2,660          $    875     $      -

  Operating expenses:
     Research and development                       19,138       24,140      32,393             7,513        2,468
     General and administrative                      3,537        4,833       5,565             1,276        1,494
     Restructuring costs                                 -            -           -                 -        2,189
                                                  --------     --------    --------          --------     --------
 Total operating expenses                           22,675       28,973      37,958             8,789        6,151
                                                  --------     --------    --------          --------     --------
 Loss from operations                              (19,269)     (25,473)    (35,298)           (7,914)      (6,151)
 Interest income (expense), net                        479       (3,815)     (1,483)             (575)        (186)
                                                  --------     --------    --------          --------     --------
 Net loss                                          (18,790)     (29,288)    (36,781)           (8,489)      (6,337)
 Deemed dividend on Preferred Stock                      -            -      (1,742)                -       (2,273)
                                                  --------     --------    --------          --------     --------
 Net loss applicable to Common Stockholders       $(18,790)    $(29,288)   $(38,523)         $ (8,489)    $ (8,610)
                                                 =========    =========   =========         =========    =========
 Basic and diluted net loss per Common Share      $ (27.85)    $ (34.44)   $ (38.31)         $  (9.52)     $ (5.18)
                                                 =========    =========   =========         =========    =========
 Shares used in calculation of basic and
   diluted net loss per Common Share                   675          850       1,006               892        1,663
                                                 =========    =========   =========         =========    =========

</TABLE>

     The following  table  indicates a summary of our balance sheet at March 31,
1999, and as adjusted to reflect the sale of 7,500,000 shares of Series R
Convertible Preferred Stock after deducting estimated offering expenses of
$300,000. See "Use of Proceeds" and "Capitalization."

<TABLE>

<CAPTION>
Balance Sheet Data
                                                               March 31, 1999
                                                           --------------------
                                                           Actual   As Adjusted
                                                          -------   -----------
                                                              (unaudited)
<S>                                                           <C>        <C>

  Cash, cash equivalents, and short-term investments      $  2,711     $ 17,411
  Working capital                                           (5,531)       9,169
  Total assets                                               6,323       21,023
  Long-term obligations, including current installments      4,287        4,287
  Accumulated deficit                                     (159,043)    (159,043)
  Total stockholders' equity (net capital deficiency)       (4,167)      10,533


</TABLE>

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<PAGE>

                              RISK FACTORS

      This offering involves a high degree of risk. You should carefully
consider the risks described below and the other information in this prospectus
before deciding to invest in shares of our Series R Convertible Preferred Stock.
The risks and uncertainties described below may not be the only ones facing
Shaman. Additional risks and uncertainties not presently known to us may also
impair our business. These risk factors supplement and do not supercede the risk
factors contained in our Annual Report on Form 10-K for the year ended December
31, 1998 and any other filings we make with the Securities and Exchange
Commission. If any of the following risks actually occur, our business,
operating results and financial condition and your investment in us could be
materially and adversely affected. In such case, the trading price of our stock,
both common and preferred, could decline and you might lose all or part of your
investment.

      This prospectus also contains forward-looking statements that involve
risks and uncertainties. Our actual results could differ materially from those
anticipated in these forward-looking statements as a result of many factors,
including the risks faced by us described below and elsewhere in this
prospectus.

Risks Related to the Rights Offering

You will likely experience immediate and substantial dilution in the book value
of your investment

      Assuming that the price at which the Series R Preferred Stock will convert
into shares of common stock is $_____ (which is equal to 10% of the average
closing sales price of the common stock for the 10 trading days ending three
trading days prior to the date of this prospectus), each share of Series R
Preferred Stock will convert into __________ shares of common stock. Since the
price of the Series R Preferred Stock is $2.00 per share, this means that the
effective per share price of the common stock to be issued upon conversion will
be $__________. Although this price is less than the current market price of our
common stock, it is substantially higher than the net tangible book value of our
common stock. In the event that the actual conversion price is equal to this
price, purchasers of shares of Series R Preferred Stock (on an as-converted into
common stock basis) in this offering will experience immediate and substantial
dilution of $_______ in the pro forma net tangible book value per share of
common stock. See "Dilution."

The rights offering will significantly reduce the ownership interest of
stockholders who do not participate


      If you do not exercise your subscription rights, your relative ownership
interest in Shaman will be decreased by the issuance of shares of Series R
Preferred Stock to those stockholders who exercise their subscription rights. In
addition, since the effective price of the common stock into which the Series R
Preferred Stock is convertible will be substantially below the market price of
the common stock, the issuance of the common stock upon conversion of the Series
R Preferred Stock, and subsequent sales of this common stock, will likely
depress the market price of the common stock. Any such decrease in the market
price of the common stock will in turn also increase the number of shares of
common stock into which any shares of Series C and Series D Convertible
Preferred Stock that are then outstanding are convertible, causing further
reduction in the percentage ownership of the holders of our common stock,
particularly to those stockholders who do not participate.


We have not obtained any independent appraisal of Shaman or the value of the
common stock or Series R Preferred Stock


      We intend to obtain prior to the effective date of this offering an
opinion from Alliant Partners that the terms of the rights offering are fair,
from a financial point of view, to our stockholders. Nevertheless, the offering
price does not necessarily bear any relationship to the book value of our
assets, past operations, cash flow, earnings, financial condition or any other
established criteria for value and should not be considered an indication of our
underlying value. Our common stock and the Series R Preferred Stock may trade at
prices below the offering price at any time after the date of this prospectus.
This offering is not being managed by any underwriter or market maker. As a
result, the price of the Series R Preferred Stock may be subject to fluctuation
and variability and may trade substantially below the initial offering price.


You will not be able to cancel your subscription prior to the expiration date of
the offering and will be unable to sell your shares until stock certificates are
issued to you

      The public trading market price of the Series R Preferred Stock may
decline before the subscription rights expire. Once you have exercised your
subscription rights, you may not revoke your exercise for any reason. Until
certificates are delivered upon acceptance of your subscription, you will not be
able to sell the shares of Series R Preferred Stock that you purchase in the
rights offering. Delivery of these certificates is subject to delay. We will not
pay you interest on funds delivered to the subscription agent pursuant to the
exercise of your subscription rights. We may terminate the rights offering at
any time. If we elect to withdraw or terminate the rights offering, neither we


                                       9
<PAGE>

nor the subscription agent will have any obligation with respect to the
subscription rights except to return, without interest, any subscription
payments.

Possible loss of net operating losses as a result of a change in control

      The completion of the rights offering may result in a "change of
ownership" under the provisions of the Internal Revenue Code of 1986 and similar
state code provisions. Utilization of our net operating losses and credits may
be subject to a substantial annual limitation due to these "change in ownership"
provisions. The annual limitation may result in the expiration of net operating
losses and credits before utilization, which could subject us to greater tax
liabilities in future periods and adversely affect our financial condition.

We expect to record a significant deemed dividend in connection with the
issuance of the Series R Preferred Stock


      The conversion price at which the Series R Preferred Stock is convertible
into shares of our common stock will be discounted from the reported trading
price by 90%. For financial accounting purposes, a portion of the proceeds of
this offering will be allocated to this "beneficial conversion" feature and
recognized as a deemed dividend to our preferred stockholders over the period
from the date the shares are issued to February 1, 2000. This deemed dividend
will increase the net loss applicable to our common stockholders. We will be
unable to determine the exact amount of the dividend to be recognized until the
date the Series R Preferred Stock is issued.


Risks Associated with our Business

We will need significant additional capital to fund continuing operations


      We need substantial working capital to fund our operations. As of March
31, 1999, we had cash, cash equivalents and short-term investment balances of
approximately $2.7 million. Our long-term capital requirements will depend on
numerous factors, including among others, the extent and progress of additional
development activities related to the botanicals products, the success of any
marketing efforts related to the botanicals products, the success of any
out-licensing efforts with respect to the pharmaceuticals programs, and the
extent and timing of additional costs associated with patents and other
intellectual property rights. Our projections show that cash on hand plus
approximately $1.0 million available under a credit agreement entered into in
April 1999 will be sufficient to fund operations at the current level through
mid-August 1999. Unless we are successful in our efforts to sell or out-license
our pharmaceutical products, or to sell or establish collaborative agreements to
sell our botanical products, we will be unable to fund our current operations
beyond mid-August 1999. In addition, unless we are successful in our efforts to
raise additional capital through this offering or other offerings of equity
securities, to sell or out-license our pharmaceutical products, or to sell or
establish collaborative agreements to sell our botanical products, our cash
resources will be used to satisfy our existing liabilities, and we will
therefore be unable to fund our operations, which may result in significant
delay of our planned activities or the cessation of operations. Even if we are
successful in these efforts to raise additional funds, such funds may not be
adequate to fund our operations on a long-term basis.

      In addition, we may need additional capital to fund the redemption of our
Series D Preferred Stock or to pay accumulated dividends. The delisting of our
common stock from The Nasdaq National Market on February 2, 1999 constituted an
optional redemption event for our Series D Preferred Stock. Since we do not have
adequate resources to pay to redeem the Series D Preferred Stock, we have issued
a notice to the holders of the Series D Preferred Stock as required under our
charter that prevented the redemption of the Series D Preferred Stock. Under the
terms of our charter, the effect of preventing this redemption event by issuing
the notice was to increase the annual cumulative dividend payable to the Series
D Preferred Stock holders to $180 per share and to adjust the conversion price
of the Series D Preferred Stock to 72% of the lowest trading price for a
designated period prior to the conversion. The notice preventing the redemption
of the Series D Preferred Stock will remain in effect for as long as our
securities are not listed on any of The Nasdaq National Market, The Nasdaq
SmallCap Market, the American Stock Exchange or the New York Stock Exchange.


      We will need to obtain additional funding through public or private equity
or debt financing, collaborative agreements or from other sources to continue
our research and development activities, fund operating expenses and prepare for
commercialization of products. If we raise additional funds by issuing equity
securities, current stockholders may experience significant dilution. If we
obtain additional funds through collaborative agreements, we may be required to
relinquish rights to certain of our technologies, product candidates, products
or marketing territories that we would otherwise seek to develop or
commercialize ourselves. We may be unable to obtain adequate financing on
acceptable terms when needed. If we are unable to obtain adequate funds, we may
be required to reduce significantly our spending and delay, scale back or
eliminate one or more of our research, development, or commercialization
programs, which would have a material adverse effect on our business, financial
condition and results of operations.



                                       10
<PAGE>
Possible inability to continue as a going concern increases investment risk


      We have suffered recurring and significant losses from operations. We have
also relied upon debt and equity financing to fund these losses and cash flow
deficits. Cash flows from future operations, if any, may not be sufficient to
enable us to continue our current level of operations, or to meet our debts as
they come due. As a result, we may not be able to continue as a going concern.
For the year ended December 31, 1998, our independent auditors have issued a
report which contains explanatory language for the uncertainty related to our
ability to continue as a going concern beyond December 31, 1999. If we are to
remain as a going concern, we will need to become and remain profitable and will
also need additional financing. We may not be successful in obtaining new
financing or in achieving profitability. This factor increases the risk to
investors.


We have a history of operating losses, expect continuing losses and may never
achieve profitability


      We have incurred significant operating losses in each year since our
founding in 1989 and expect to continue to incur net losses for the foreseeable
future. We incurred a net loss of approximately $6.3 million for the quarter
ended March 31, 1999 and additional non-cash expense of $2.3 million incurred in
connection with the issuance of the control notice to holders of Series D
Preferred Stock, and as of March 31, 1999, our accumulated deficit was
approximately $159 million.


      If we are to become and remain profitable, we will need to, among other
things, generate product revenues. We have not generated any product sales to
date. We have changed the director of our operations and are pursuing a new
business model in the botanical dietary supplement industry. Our botanical
dietary supplement products are being prepared for commercial introduction. In
order to generate revenues or profits, we must successfully market these
products or enter into collaborative agreements with others who can successfully
market them. Even if our products are introduced, they may not achieve market
acceptance or we may not achieve profitability.

      Our pharmaceutical product candidates and compounds are still in the
research and development stage and we have ceased all our pharmaceutical
operations. In order to generate revenues from these products, we must
out-license these product candidates. It is possible that our out-licensing
efforts may not be successful, and that we or our licensees may not obtain
required regulatory approvals. Even if our product candidates are developed and
introduced, they may not be successfully marketed or may not achieve market
acceptance or we may not achieve profitability.

The ownership interests of our common stockholders will be substantially reduced
by future issuances of stock upon exercises and conversions of currently
outstanding options, warrants and preferred stock


      We currently have outstanding many securities that are convertible into
shares of common stock. The holders of common stock will be diluted upon the
exercise of outstanding options and warrants and upon conversion of the Series A
Preferred Stock, the Series C Preferred Stock and the Series D Preferred Stock.
The Series D Preferred Stock is currently convertible into common stock at a
price equal to 72% of the market price of the common stock, and commencing in
August 1999, the Series C Preferred Stock will be convertible at a price equal
to 85% of the market price of the common stock and may be freely resold on the
market. The common stock issued upon conversion of the Series C and Series D
Preferred Stock will substantially dilute the common stock and will likely
depress the price of the common stock if large amounts are offered for sale in
the open market. In addition, there are outstanding warrants to purchase 548,344
shares of Series R Preferred Stock. The exercise of these warrants and the sale
of common stock underlying the Series R Preferred Stock will also dilute the
common stock.


We have no experience in the business of botanical dietary supplements and may
not be successful in transitioning into this new business

      We are in the process of transitioning our operations from pharmaceutical
product development to botanical dietary supplement development and
commercialization. We have no experience in this new industry segment and must
create a new business model. Some skills and relationships developed over time
may not be transferable to our new business. While we have been working with
natural products since our inception, we have no prior experience manufacturing
or marketing dietary supplements. We may not be successful in these activities.

      Our botanical products are at various stages of development, ranging from
initial research to final formulation. We will need to conduct additional
research and development to move our product candidates toward
commercialization. Our research and development efforts on potential products
may not lead to development of products that we can successfully commercialize.
In addition, we may not be able to produce our products in commercial quantities
at acceptable costs, or to market and sell our products successfully. Our
products may also prove to have undesirable or unintended side effects that may
prevent or limit their commercial use. Accordingly, we may curtail, redirect,
suspend or eliminate our product development or commercialization at any time.



                                       11
<PAGE>

The failure or loss of third parties on which we rely to manufacture our
products and to perform other services could adversely affect our future
operations and financial results

      We currently produce products only in pilot scale quantities and do not
have the staff or facilities necessary to manufacture products in commercial
quantities. Therefore, we must rely on collaborative partners or third party
manufacturing facilities. We may not be successful in entering into third party
manufacturing arrangements on acceptable terms, if at all. In addition, should
we or our third party manufacturers encounter delays or difficulties in
producing, packaging and distributing our finished products, our clinical trials
and market introduction and subsequent sales of our products could be adversely
affected.

      Contract manufacturers must conform to certain Good Manufacturing
Practices regulations for foods on an ongoing basis. Our dependence on third
parties for the manufacture of our products may adversely affect our ability to
develop and deliver products on a timely and competitive basis. If we are
required to manufacture our own products, we will be required to build or
purchase a manufacturing facility, will be subject to manufacturing requirements
and to similar risks regarding delays or difficulties encountered in
manufacturing any such products, and we will require substantial additional
capital. We may be unable to manufacture any such products successfully or in a
cost-effective manner.

We have only a limited marketing staff and may be unable to launch our products
in the marketplace

      We currently have minimal marketing staff. If we are unable to
successfully establish, execute and finance a complete marketing plan, we may
not achieve a successful product entry into the marketplace. Such failure would
have a material adverse effect on our business, financial condition and results
of operations.

Our success will depend on entering into strategic partnership relationships

      Our ability to develop, commercialize, market and sell our botanical
supplement products will depend on our entering into strategic partner
relationships. We are currently searching for strategic partners for development
and commercialization. Our success in the botanicals market depends in part upon
our ability to attract, retain and motivate key strategic partners in each major
sales and distribution channel. See "Business--Botanicals-Customers and
Partners." We may not be successful in negotiating or entering into such
agreements on terms favorable to us, or at all, and any agreement, if entered
into, may be unsuccessful. We may never derive any significant revenues from any
of our existing or future collaborations.

      We also intend to seek collaborative agreements to develop and
commercialize our pharmaceutical product candidates. We may not be successful in
negotiating or entering into such agreements on terms favorable to us or at all,
and any agreement, if entered into, may be unsuccessful.

We may incur costs in connection with the termination of prior research and
development agreement

      The research and development efforts in our discontinued diabetes program
were dependent upon arrangements with Lipha/Merck. We are currently in
negotiations with Lipha/Merck for the discontinuation of their research
agreement. Lipha/Merck will make no further research payments, and may have a
claim against us in connection with the termination of the agreement. We may
never derive any significant revenues from any of our existing or future
collaborations and may incur a loss in connection with the termination of
existing collaborations.

We are subject to intense competition in the botanical dietary supplement
industry

      The dietary supplement business is highly competitive and is characterized
by short product life cycles, significant pressure on pricing and heavy
commitment of marketing resources. Many of our existing competitors are
substantially larger and have greater financial, research and development,
production, marketing, sales and other resources than we do. Such companies
offer a variety of competitive products and services and much broader product
lines. We face actual and potential competition not only from these established
companies, but also from start-up companies developing and marketing new
commercial products. Our failure to successfully compete for customers could
adversely affect our future growth, revenues and profitability.





We have no experience in marketing products over the Internet and may not
succeed

      We intend to market our first product, SB-300, directly to consumers
through the Internet on our web site. We have no experience in marketing any
product on the Internet, and we have no market visibility or brand name
awareness on the Internet. Although Internet sites marketing dietary supplements
do exist, the Internet may never develop as a strong or viable marketing and


                                       12
<PAGE>

distribution channel for dietary supplements. We may not be successful in using
the Internet as a direct marketing and distribution channel for our products.

The failure of third party Internet access providers to keep our web site
operational could adversely affect our business

      We will rely entirely or in part on third parties to provide us with
access to the Internet and to enable commerce over our web site, including
providing adequate security of information provided over the web site. Any
failure by such third party providers to provide uninterrupted access by our
customers to our web site and to ensure that commerce can be conducted on our
web site could have a material adverse effect on our business, financial
condition and results of operations.

We will only be able to execute our business plan if internet usage grows

      The success of our first product launch and a portion of our future
business is highly dependent on the adoption of the Internet as a widely-used
medium for commercial activities, including advertising, direct marketing and
other commerce. The Internet market is at a very early stage of development, is
rapidly evolving and is characterized by an increasing number of entrants that
are introducing or developing competing products and services. The Internet has
experienced, and is expected to continue to experience, significant growth in
the number of users and amount of traffic. However, the Internet infrastructure
may not be able to support the demands placed on it by this continued growth. In
addition, the Internet could lose its viability due to delays in the development
or adoption of new standards and protocols to handle increased levels of
Internet activity or due to increased governmental regulation. Moreover,
critical issues concerning the commercial use of the Internet, including
security, reliability, cost, ease of use, accessibility and quality of service,
remain unresolved. Such issues may negatively affect the growth of Internet use
or the attractiveness of commerce and communication on the Internet. Our
business, financial condition and operating results will be materially adversely
affected if critical issues concerning the commercial use of the Internet are
not favorably resolved, the necessary infrastructure is not developed, or the
Internet does not become a viable commercial marketplace.

Failure of the web infrastructure would harm our business

      The success of our first product launch and a portion of our future
business will substantially depend, among other things, upon the continued
expansion and maintenance of the web infrastructure as a reliable network
backbone. This requires the necessary speed, capacity and security, and timely
development of enabling products such as high speed modems, for providing
reliable web access and services. We do not know whether the web infrastructure
will continue to be able to support the growing demands placed upon it as the
web continues to grow in terms of the number of users, the frequency of users
and the increased bandwidth requirements. The performance or reliability of the
web could be adversely affected by these demands. In addition, the Internet
could lose its viability due to delays in the development or adoption of new
standards and protocols required to handle increased levels of Internet activity
or due to increased governmental regulation. Changes in, or insufficient
availability of, telecommunications services to support the Internet could also
result in slower response times and adversely affect usage of the web. The web
has experienced a number of outages and other delays due to damage to portions
of its web infrastructure. Any such outages or any other failure of the Internet
infrastructure to effectively support the expected growth could delay the growth
of the Internet and adversely affect our business.

On-line security breaches could harm our business

      A significant barrier to electronic commerce and communications is the
secure transmission of confidential information over public networks. We plan to
rely on encryption and authentication technology licensed from third parties to
provide the security and authentication necessary to effect secure transmission
of confidential information to and from our web site. It is possible that
advances in computer capabilities, new discoveries or other developments will
result in a compromise or breach of the algorithms that we select for this
purpose. This could have a material adverse effect on our business, results of
operations and financial condition.

      We may be required to expend significant capital and other resources to
protect against the threat of such security breaches or to alleviate problems
caused by such breaches. The public's concern over the security of Internet
transactions and the privacy of users may also inhibit the growth of the web as
a means of conducting commercial transactions. To the extent that our activities
or those of third party contractors involve the storage and transmission of
proprietary information, such as credit card numbers, security breaches could
expose us to a risk of loss or litigation and possible liability. Our security
measures may not be sufficient to prevent security breaches, and the failure to
prevent such security breaches could have a material adverse effect on our
business, results of operations and financial condition.

                                       13
<PAGE>

Legal and regulatory uncertainties regarding the Internet could harm our
business

      There is an increasing number of laws and regulations pertaining to the
Internet. In addition, a number of legislative and regulatory proposals are
under consideration by federal, state, local and foreign governments and
agencies. Laws or regulations may be adopted with respect to the Internet
relating to liability for information retrieved from or transmitted over the
Internet, online content regulation, user privacy, taxation, pricing and quality
of products and services. The growth and development of the market for online
commerce may prompt more stringent consumer protection laws that may impose
additional burdens on conducting business online. Moreover, the applicability to
the Internet of existing laws governing issues such as intellectual property
ownership and infringement, copyright, trademark, trade secret, obscenity,
libel, employment and personal privacy is uncertain and developing. Any new
legislation or regulation, or the application or interpretation of existing
laws, may decrease the growth in the use of the Internet, increase our cost of
doing business or otherwise have a material adverse effect on our business,
operations and financial condition. In addition, since we expect that our
products will be available over the Internet in multiple states, and as we
expect to have consumers residing in such states, these jurisdictions may claim
that we are required to qualify to do business as a foreign corporation in each
such state. We are currently qualified to do business only in California, and
failure to qualify as an out-of-state or foreign corporation in a jurisdiction
where we are required to do so could subject us to taxes and penalties for the
failure to qualify.


Government regulation could adversely impact our business


      The manufacturing, processing, formulating, packaging, labeling and
advertising of our botanical dietary supplement products are subject to
regulation in the United States by several federal agencies, including the Food
and Drug Administration, the Federal Trade Commission, the Consumer Product
Safety Commission, the Department of Agriculture and the Environmental
Protection Agency. Our activities are also regulated by various agencies of the
states and localities where we will distribute and sell our products.

      The composition and labeling of dietary supplements is most actively
regulated by the FDA under the provisions of the Federal Food, Drug, and
Cosmetic Act. The FFDC Act has been revised in recent years by the Nutrition
Labeling and Education Act of 1990 and by the Dietary Supplement Health and
Education Act of 1994.

      Our botanical product candidates are generally regulated as dietary
supplements under the 1994 Dietary Supplement Health and Education Act, and are,
therefore, generally not subject to pre-market approval by the FDA. However,
these product candidates are subject to FDA regulation, particularly relating to
adulteration and misbranding. For instance, we are responsible for ensuring that
all dietary ingredients in a supplement are safe, and must notify the FDA in
advance of putting a product containing a new dietary ingredient (i.e., an
ingredient not marketed in the United States before October 15, 1994) on the
market and furnish adequate information to provide reasonable assurance of the
ingredient's safety. Currently, we are only pursuing products that are old
dietary ingredients and are therefore not subject to this procedure. Further, if
we make statements about a supplement's effects on the structure or function of
the body, we must, among other things, substantiate that the statements are
truthful and not misleading. In addition, our product labels must bear proper
ingredient and nutritional labeling and we must manufacture our supplements in
accordance with current Good Manufacturing Practices regulations for foods. A
product can be removed from the market if it is shown to pose a significant or
unreasonable risk of illness or injury. Moreover, if the FDA determines that the
"intended use" of any of the our products is for the diagnosis, cure,
mitigation, treatment or prevention of disease, the product would meet the
definition of a drug and would require pre-market approval of safety and
effectiveness prior to its manufacture and distribution. Our failure to comply
with applicable FDA regulatory requirements may result in, among other things,
injunctions, product withdrawals, recalls, product seizures, fines, and criminal
prosecution.

      In March 1999, new FDA regulations governing the labeling of dietary
supplements took effect. The new rules require that information such as the
complete list of ingredients and levels of vitamins and minerals be included on
product labels. While in our judgment these regulatory changes are generally
favorable to the dietary supplements industry, in the future we may be subject
to additional laws or regulations that could have an adverse effect on the
industry and on our business. In addition, existing laws and regulations may be
repealed and applicable regulatory authorities may interpret them stringently or
unfavorably.

      We cannot predict the nature of future laws, regulations, interpretations
or applications, nor can we determine what effect either additional government
regulations or administrative orders, when and if promulgated, or disparate
federal, state and local regulatory schemes would have on our business in the
future. Any change could materially and adversely affect our results of
operations and financial condition.

      Governmental regulations in foreign countries where we may commence or
expand sales may prevent or delay entry into the market or prevent or delay the
introduction, or require the reformulation, of our products. Compliance with
such foreign governmental regulations is generally the responsibility of our
partners or distributors in those countries, which distributors are independent
contractors over whom we have limited or no control.



                                       14
<PAGE>

Environmental regulation

      In connection with our research and development activities and
manufacturing of materials, we are subject to federal, state and local laws,
rules, regulations and policies governing the use, generation, manufacture,
storage, air emission, effluent discharge, handling and disposal of certain
materials and wastes. Although we believe we comply with these laws and
regulations in all material respects and have not been required to take any
action to correct any noncompliance, we may be required to incur significant
costs to comply with environmental and health and safety regulations in the
future. Our research, development, and manufacturing activities involve the
controlled use of hazardous materials and chemicals. Although we believe that
our safety procedures for handling and disposing of such materials comply with
the standards prescribed by state and federal regulations, we cannot eliminate
the risk of accidental contamination or injury from these materials completely.
In the event of an accident, we could be held liable for any resulting damages.
Although we have secured insurance to mitigate such expense, any such liability
could exceed our insurance coverage and resources. Such liability could have a
material adverse effect on our business, financial condition and results of
operations.

Product liability claims asserted against us in the future could adversely
affect our business

      Our business exposes us to potential product liability risks that are
inherent in the development, testing, manufacture, marketing and sale of
pharmaceutical and dietary supplement products. Product liability insurance for
the pharmaceutical and dietary supplement industries generally is expensive. Our
present product liability insurance coverage, which includes coverage for acts
by third parties, including manufacturers of our product candidates, may not be
adequate. We will also need to increase our insurance coverage as we further
develop our products, and we may be unable to obtain adequate insurance coverage
against all potential claims at a reasonable cost. Some of our development and
manufacturing agreements contain insurance and indemnification provisions
pursuant to which we could be held accountable for certain occurrences. If we
are subject to product liability claims for which we have inadequate insurance
we could suffer a material adverse effect on our business, financial condition
and results of operations.

Negative publicity regarding the safety or quality of our products could
adversely impact our business

      Because we depend on consumers' perception of the safety and quality of
our products as well as similar products distributed by other companies (which
may not adhere to the same quality standards as ours), if our products or a
competitor's similar products were asserted to be harmful to consumers, our
business could be adversely affected by that negative publicity. In addition,
because we depend on perceptions, adverse publicity associated with illness or
other adverse effects resulting from consumers' failure to use our products as
we suggest, other misuse or abuse of our products or any similar products
distributed by other companies could affect the market acceptance of our
products and materially adversely affect our business.

      Furthermore, we believe the recent growth experienced by the nutritional
supplement market is based in part on national media attention regarding recent
scientific research suggesting potential health benefits from regular
consumption of certain dietary supplements and other nutritional products. This
research has been described in major medical journals, magazines, newspapers and
television programs. The scientific research to date is preliminary, and in the
future scientific results and media attention may contain unfavorable or
inconsistent findings that could have a material adverse effect on our business.


Our dependence on raw plant material from Latin and South America, Africa and
Southeast Asia makes us particularly susceptible to the risks of interruptions
in our supplies


      We currently import all of the plant materials for our products from
countries in Latin and South America, Africa and Southeast Asia. We are
dependent upon a supply of raw plant material to make our products. We do not
have formal agreements in place with all of our suppliers. Continued source of
plant supply risks include:

     - unexpected changes in regulatory requirements,
     - exchange rates, tariffs and barriers,
     - difficulties in coordinating and managing foreign operations,
     - political instability, and
     - potentially adverse tax consequences.

      Interruptions in supply or material increases in the cost of supply could
have a material adverse effect on our business, financial condition and results
of operations. If the prices of raw materials rise, we may not be able to raise
prices quickly enough to offset the effect of these increased raw material
costs, if at all.


                                       15
<PAGE>

      In addition, tropical rainforests and irreplaceable plant resources found
only in such rainforests are currently threatened with destruction. The
destruction of portions of the rainforests which contain the source material
from which our current or future products are derived could materially and
adversely affect our business, financial condition and results of operations.

The failure to protect our intellectual property rights could adversely impact
our business


      Our success will be substantially dependent on our proprietary technology.
We rely primarily on a combination of patent, copyright and trademark laws,
trade secrets, confidentiality procedures and contractual provisions to protect
our intellectual property. These means of protecting our proprietary rights may
not be adequate. Our trademarks are valuable assets that are very important to
the marketing of our products. Our policy is to pursue registrations for all of
the trademarks associated with our key products. We currently have 20 U.S.
patents issued, 12 U.S. patent applications pending, and one international
application filed. The pending patents may never be approved or issued. Any
issued patents may not provide sufficiently broad protection or may not prove
valid or enforceable in actions against alleged infringers. Others may
independently develop similar products, duplicate any of our products or design
around any of our patents. In addition, many foreign countries may not protect
our products and intellectual property rights to the same extent as the laws of
the United States, and there is considerable variation between countries as to
the level of protection afforded under patents and other proprietary rights.
Such differences may expose us to increased risks of commercialization in each
foreign country in which we may sell products. We also depend on unpatented
trade secrets. All of our employees have entered into confidentiality
agreements. However, others may independently develop substantially equivalent
information and techniques or otherwise gain access to our trade secrets, our
trade secrets may be disclosed or we may be unable to effectively protect our
rights to unpatented trade secrets. To the extent that we or our consultants or
research collaborators use intellectual property owned by others in their work
for us, disputes also may arise as to the rights in related or resulting
know-how and inventions. Litigation may be necessary in the future to enforce
our intellectual property rights, protect our trade secrets or to determine the
validity and scope of the intellectual property rights of others. In the event
of litigation to determine the validity of any third party's claims, we could be
required to expend significant resources and divert the efforts of our technical
and management personnel, whether or not such litigation is determined in our
favor.


      Our success in outlicensing our pharmaceutical assets depends in large
part on our ability to obtain and maintain patents, protect trade secrets and
operate without infringing upon the proprietary rights of others. The patent
position of companies in the pharmaceutical industry generally is highly
uncertain, involves complex legal and factual questions, and has recently been
the subject of much litigation. No consistent policy has emerged from the U.S.
Patent and Trademark Office, or PTO, or the courts regarding the breadth of
claims allowed or the degree of protection afforded under pharmaceutical
patents.


      We are currently in a dispute in Europe regarding a patent for our
proanthocyanidin polymer composition (which covers the active ingredient in
SP-303/Provir). The European Patent Office, the French Patent Office, the German
Patent Office and the Australian Patent Office have each granted a patent
containing broad claims to proanthocyanidin polymer compositions (and methods of
use of such compositions), which are similar to our specific composition, to
Leon Cariel and the Institut des Substances Vegetales. The effective filing date
of these patents is prior to the effective filing date of our foreign pending
patent application in Europe. Certain of the foreign patents have been granted
in jurisdictions where examination is not rigorous. We have instituted an
Opposition in the European Patent Office against granted European Patent No.
472531 owned by Leon Cariel and Institut des Substances Vegetales. We believe
that the granted claims are invalid and intend to vigorously prosecute the
Opposition. In the United States, the Patent and Trademark Office awarded
judgment to us in an Interference regarding this patent dispute.


      We may be unsuccessful in having the granted European patent revoked or
the claims sufficiently narrowed so that our proanthocyanidin polymer
composition and methods of use are not potentially covered. The holders of the
granted European patent may assert against us claims relating to this patent. If
they are successful, we may not be able to obtain a license to this patent at
all, or at reasonable cost, or be able to develop or obtain alternative
technology to use in Europe or elsewhere. If we cannot obtain licenses to the
patent, we may not be able to introduce or sell our SP-303/Provir product in
Europe. The earlier effective filing date of this patent could limit the scope
of the patents, if any, that we may be able to obtain or result in the denial of
our patent applications in Europe or elsewhere.

We may be subject to infringement claims by third parties

      The pharmaceutical industry and, to a lesser extent, the dietary
supplement industry, is subject to frequent litigation regarding patent and
other intellectual property rights. Leading companies and organizations in these
industries have numerous patents that protect their intellectual property rights
in these areas. Third parties may assert claims against us with respect to our
existing and future products. In the event of litigation to determine the
validity of any third party's claims, we could be required to expend significant
resources and divert the efforts of our technical and management personnel,
whether or not such litigation is determined in our favor. In the event of an
adverse result of any such litigation, among other requirements, we could be


                                       16
<PAGE>

required to develop non-infringing technology or to obtain licenses to the
technology that is the subject of the litigation. We may not be successful in
developing non-infringing technology or in obtaining a license to use the
technology on commercially reasonable terms.

Our executive officers and key personnel are critical to our business and may
not remain with Shaman in the future

      Our success depends in large part upon the continued contributions of our
key senior management. Our future performance also depends on our ability to
attract and retain qualified management and scientific personnel. Competition
for such personnel is intense, and we may be unable to continue to attract,
assimilate or retain other highly qualified technical and management personnel
in the future. The loss of key personnel or the failure to recruit additional
personnel or to develop needed expertise could have a material adverse effect on
our business, financial condition and results of operations.


Potential year 2000 computer software problems could adversely impact future
operations


      The year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year. Any of our computer
programs or hardware that have date-sensitive software or embedded chips may
recognize a date using "00" as the year 1900 rather than the year 2000. This
could result in a system failure or miscalculations causing disruptions of
operations, including, among other things, a temporary inability to process
transactions or engage in similar normal business activities.

      Based on recent assessments, we have determined that we will be required
to certify portions of our internal operating systems software and certain
hardware so that those systems will properly utilize dates beyond December 31,
1999. We presently believe that with modifications or replacements of existing
software and certain hardware, the year 2000 issue can be mitigated. We believe
that such modification and replacements are not significant, and should such
modification and replacements be delayed there would be no material impact on
our operations. We cannot, however, be certain that we have identified all of
the potential risks to our business that could result from matters related to
the year 2000.


      We are approximately 85% complete with the assessment of all internal
systems that could be significantly affected by the year 2000. To date, all
assessments have been performed by our employees, and we have therefore not
incurred any external costs related to this assessment project. We estimate that
the upgrades for those systems not in compliance will total approximately
$200,000. After the assessment phase is completed, we will need to purchase,
install and test the upgrades to ensure they meet internal year 2000 compliance.
We expect to complete our internal year 2000 readiness program in the third
quarter of 1999. We are in the process of asking our significant suppliers and
subcontractors that do not share information systems with us (external agents)
whether their systems are year 2000 compliant. To date, we are not aware of any
external agent with a year 2000 issue that would materially impact our results
of operations, liquidity, or capital resources. However, we have no means of
ensuring that external agents will be year 2000 ready. The inability of external
agents to fix their year 2000 problems in a timely fashion could materially
adversely affect us.


      We currently have no contingency plans in place in the event we do not
complete all phases of our year 2000 program. We plan to evaluate the status of
completion in the second quarter of 1999 and determine whether such a plan is
necessary.

The recent delisting from the Nasdaq National Market may reduce the liquidity
and marketability of our stock and may depress the market price of our stock

      On February 2, 1999, Nasdaq delisted our common stock from The Nasdaq
National Market and moved our stock to the National Association of Securities
Dealers, Inc.'s OTC Bulletin Board. Although our securities are included on the
OTC Bulletin Board, there can be no assurance that a regular trading market for
the securities will be sustained in the future. The OTC Bulletin Board is an
unorganized, inter-dealer, over-the-counter market which provides significantly
less liquidity than The Nasdaq Stock Market, and quotes for stocks included on
the OTC Bulletin Board are not listed in the financial sections of newspapers as
are those for The Nasdaq Stock Market. Therefore, prices for securities traded
solely on the OTC Bulletin Board may be difficult to obtain. The reduced
liquidity of our stock and the reduced public access to quotations for our stock
could depress the market price of our stock.

"Penny Stock"  regulations  may impose  restrictions on  marketability  of our
stock


      The Securities and Exchange Commission has adopted regulations which
generally define "penny stock" to be any equity security that is not traded on a
national securities exchange or Nasdaq and that has a market price of less than
$5.00 per share or an exercise price of less than $5.00 per share, subject to
certain exceptions. Since our securities that are currently included on the OTC
Bulletin Board are trading at less than $5.00 per share at any time, our stock
may become subject to rules that impose additional sales practice requirements
on broker-dealers who sell such securities to persons other than established
customers and accredited investors (generally, such investors have assets in


                                       17
<PAGE>

excess of $1,000,000 or an individual annual income exceeding $200,000, or,
together with the investor's spouse, a joint income of $300,000). For
transactions covered by these rules, the broker-dealer must make a special
suitability determination for the purchase of such securities and have received
the purchaser's written consent to the transaction prior to the purchase.
Additionally, for any transaction involving a penny stock, unless exempt, the
rules require, among other things, the delivery, prior to the transaction, of a
risk disclosure document mandated by the SEC relating to the penny stock market
and the risks associated therewith. The broker-dealer must also disclose the
commission 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, 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. Consequently, the penny stock
rules may restrict the ability of broker-dealers to sell our securities and may
affect the ability of stockholders to sell our securities in the secondary
market.


Our stock price has been and may continue to be highly volatile

      The price of our common stock has been particularly volatile and will
likely continue to fluctuate in the future. Announcements of technological
innovations, regulatory matters or new commercial products by us or our
competitors, developments or disputes concerning patent or proprietary rights,
publicity regarding actual or potential product results relating to products
under development by us or our competitors, regulatory developments in both the
United States and foreign countries, public concern as to the safety of
pharmaceutical or dietary supplement products, and economic and other external
factors, as well as period-to-period fluctuations in financial results, may have
a significant impact on the market price of our common stock. In addition, from
time to time, the stock market experiences significant price and volume
fluctuations that may be unrelated to the operating performance of particular
companies or industries. The market price of our common stock, like the stock
prices of many publicly traded smaller companies, has been and may continue to
be highly volatile.

Anti-takeover Provisions in our Charter Documents and Delaware law may inhibit
potential acquisition bids for Shaman, which may adversely affect the market
price of our common stock and the voting rights of the holders of the common
stock


      Certain provisions of our charter documents and Delaware law make it more
difficult for a third party to acquire, and may discourage a third party from
attempting to acquire, us, even if a change in control would be beneficial to
our stockholders. These provisions could also limit the price that certain
investors might be willing to pay in the future for shares of the common stock.
The provisions include the division of our board of directors into two separate
classes, the ability of the board to elect directors to fill vacancies created
by an expansion of the board, the power of the board to amend our bylaws, and
the requirement that at least 66 2/3% of the outstanding shares are required to
call a special meeting of stockholders. Our board will also have the authority
to issue up to 1,393,715 additional shares of preferred stock (after giving
effect to the issuance of up to 10,000,000 shares of Series R Preferred Stock)
and to fix the price, rights, preferences, privileges and restrictions of those
shares without any further vote or action by the stockholders. 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 preferred stock that may be issued in the
future. The issuance of preferred stock with voting rights could make it more
difficult for a third party to acquire a majority of the outstanding voting
stock. Certain provisions of Delaware law applicable to us could also delay or
make more difficult a merger, tender offer or proxy contest involving Shaman,
including Section 203 of the Delaware General Corporation Law, which prohibits a
Delaware corporation from engaging in any business combination with any
interested stockholder for a period of three years unless certain conditions are
met.



                                       18
<PAGE>

                       WHERE YOU CAN FIND MORE INFORMATION

      This prospectus is part of a registration statement on Form S-1 we have
filed with the Securities and Exchange Commission. This prospectus does not
contain all of the information set forth in the registration statement, certain
parts of which are omitted in accordance with the rules and regulations of the
SEC. For further information regarding Shaman, you may refer to the registration
statement, including its exhibits and schedules. The registration statement may
be inspected at the public reference facilities maintained by the SEC at Room
1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and copies of all or any
part of the registration statement may be obtained from the SEC upon payment of
the prescribed fees.

      We also file annual, quarterly and special reports, proxy statements and
other information with the SEC. You may read and copy any document we file at
the SEC's Public Reference Room at 450 Fifth Street, N.W., Washington, D.C.
20549, and at the SEC's regional offices located at 75 Park Place, New York, New
York 10007, and 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511. You may also obtain copies of such material by mail from the SEC's
Public Reference Room at 450 Fifth Street, N.W., Washington, D.C. 20549, at
prescribed rates. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. You may also examine our SEC filings through the
SEC's web site at http://www.sec.gov.


                                       19
<PAGE>


                                 USE OF PROCEEDS

      We estimate that the net proceeds from the sale of the 7,500,000 shares of
Series R Convertible Preferred Stock offered by this prospectus will be
$14,700,000, after deducting estimated offering expenses of $300,000. We intend
to use the funds generated by this offering to retire certain existing debt,
pursue development, production and marketing of products within the botanicals
business and for working capital purposes.


     We intend to use  approximately $1 million of the net proceeds to repay any
amount incurred under the debt agreement entered into in April 1999. We expect
to use the balance of the net proceeds for the initial commercialization of our
first product, SB-300 currently budgeted at approximately $2.5 million, and for
the development, production, and marketing of our other botanical product
candidates, for working capital, including significant current liabilities and
for general corporate purposes. In the event that less than all of the shares of
Series R Preferred Stock are sold, we will still be required to repay
approximately $1 million in outstanding indebtedness. We will therefore have
fewer funds available for the commercialization of SB-300.


      The amounts actually expended for these purposes may vary significantly
depending upon numerous factors, including the amount raised by this offering,
progress of our research and development programs, the status of competitive
products and the availability of alternative financing, including agreements
with other companies relating to the development and marketing of our products
and the other factors described under "Risk Factors." Accordingly, we will
retain broad discretion in the allocation of the net proceeds of this offering.
Pending such uses, the net proceeds of this offering will be invested in United
States government securities, other investment grade debt securities and other
short-term investments. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Liquidity and Capital Resources."


                                       20
<PAGE>

                           PRICE RANGE OF COMMON STOCK


      Since February 2, 1999, Shaman's common stock has been traded on the OTC
Bulletin Board of the National Association of Securities Dealers, Inc. under the
symbol "SHMN." Our common stock was traded on the Nasdaq Stock Market from our
initial public offering on January 26, 1993 until February 1, 1999.

      Set forth below is the range of high and low closing sale prices for
Shaman's common stock for the periods indicated, as reported by the OTC Bulletin
Board or The Nasdaq Stock Market, as applicable, and as adjusted for the
1-for-20 reverse stock split effected on June ___ 1999:


<TABLE>

<CAPTION>
                                                         High           Low
                                                        ------         -----
<S>                                                    <C>             <C>
Fiscal Year 1997
     First Quarter Ended March 31, 1997                $ 125.00       $  77.60
     Second Quarter Ended June 30, 1997                $ 123.80       $  93.80
     Third Quarter Ended September 30, 1997            $ 140.00       $ 102.40
     Fourth Quarter Ended December 31, 1997            $ 141.20       $  85.00

Fiscal Year 1998
     First Quarter Ended March 31, 1998                $ 110.00       $  82.60
     Second Quarter Ended June 30, 1998                $ 100.00       $  88.20
     Third Quarter Ended September 30, 1998            $  80.00       $  63.80
     Fourth Quarter Ended December 31, 1998            $  66.20       $  21.80

Fiscal Year 1999
     First Quarter Ended March 31, 1999                $  40.60       $   3.40
     Second Quarter Ending June 30, 1999
      (through  April 30, 1999)                        $   4.60       $   1.20


</TABLE>


                                 DIVIDEND POLICY


      We have paid no cash dividends on the common stock since the Company's
inception and do not anticipate paying any dividends in the foreseeable future.
The Company's loan agreement with MMC/GATX Partnership No. 1 restricts the
payment of cash dividends on any equity security so long as any amount remains
outstanding under such loan agreement. In addition, Shaman's charter requires
that Shaman pay all required dividends to the holders of Series A Preferred
Stock, Series C Preferred Stock, and Series D Preferred Stock, respectively,
prior to the payment of dividends to the holders of our common stock or Series R
Convertible Preferred Stock. At March 31, 1999, we had an accumulated deficit of
$159.0 million and, until this deficit is eliminated, we will be prohibited from
paying cash dividends except out of net profits.



                                       21
<PAGE>

                                 CAPITALIZATION


     The following table sets forth the unaudited actual  capitalization  of the
Company as of March 31, 1999 and as adjusted to reflect the sale of 7,500,000
shares of Series R Convertible Preferred Stock offered hereby at the estimated
public offering price of $2.00 per share and after deducting the estimated
offering expenses of $300,000.


<TABLE>
<CAPTION>


                                                                                            March 31, 1999
                                                                                     ------------------------------
                                                                                       Actual (2)    As Adjusted (1)
                                                                                      -----------    ---------------
                                                                                               (unaudited)
                                                                             (in thousands, except share and per share amounts)

<S>                                                                                   <C>            <C>

 Long-term debt and capital lease obligations, including current portion...........     $   4,287        $   4,287

 Stockholders' equity
       Preferred Stock, $.001 par value per share, 2,000,000 shares authorized;
          Series A Preferred Stock, 400,000 shares authorized and designated;
               400,000 shares issued and outstanding, actual and as adjusted.......            --               --
          Series C Preferred Stock, 200,000 shares authorized and designated;
               115,958 issued and outstanding, actual and as adjusted..............            --               --
          Series D Preferred Stock, 6,285 shares authorized and designated;
               2,075 shares issued and outstanding, actual and as adjusted.........            --               --
          Series R Preferred Stock 10,000,000 shares authorized and designated;
               7,500,000 shares issued and outstanding, as adjusted................            --                8
          Common Stock, $.001 par value per share, 70,000,000 shares authorized;
               1,929,358 shares issued and outstanding, actual and as adjusted.....             2                2
       Additional paid-in capital..................................................       154,990          169,682
       Deferred compensation and other adjustments.................................          (116)            (116)
       Accumulated deficit.........................................................      (159,043)        (159,043)
                                                                                       ----------       ----------
              Total stockholders' equity...........................................        (4,167)          10,533
                                                                                       ----------       ----------
              Total capitalization.................................................     $     120        $  14,820
                                                                                       ==========       ==========

</TABLE>

- ----------
(1)  Adjusted to reflect the sale of 7,500,000 shares of Series R Convertible
Preferred Stock at the estimated public offering price of $2.00 per share and
estimated net proceeds of approximately $14.7 million.  See "Use of Proceeds."

(2)  See "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources."


                                       22
<PAGE>


                               SELECTED FINANCIAL DATA


     We are providing the  following  information  to aid you in the analysis of
the offering. We derived the information for the years ended December 31, 1994,
1995, 1996, 1997 and 1998 from our audited financial statements for 1994 through
1998. The 1996 through 1998 financial statements are included elsewhere in this
prospectus. We derived the unaudited information for the quarters ended March
31, 1998 and 1999 and at March 31, 1999 from the unaudited financial statements
which are not included in this prospectus. In the opinion of management, the
unaudited financial statements include, all adjustments (consisting of normal
recurring adjustments) considered necessary for a fair presentation. The results
of operations for the interim periods shown herein are not necessarily
indicative of operating results for the entire year. This information is only a
summary and you should read it in conjunction with Shaman's financial statements
(and related notes) and Management's Discussion and Analysis of Financial
Condition and Results of Operations included elsewhere in this prospectus and
contained in annual reports, quarterly reports and other information on file
with the Securities and Exchange Commission.





<TABLE>
<CAPTION>

                                                                 Year Ended December 31,                         March 31, 1999
                                                  -------------------------------------------------------     --------------------
                                                    1994        1995       1996        1997        1998         1998        1999
                                                  --------    --------   --------    --------    --------     --------    --------
                                                                      (in thousands, except per share data)
<S>                                               <C>          <C>          <C>          <C>         <C>      <C>         <C>

Statement of Operations Data:
 Revenue from collaborative agreements            $  1,360    $  2,210   $  3,406    $  3,500    $  2,660     $    875    $      -
  Operating expenses:
     Research and development                       18,643      17,635     19,138      24,140      32,393        7,513       2,468
     General and administrative                      3,545       3,705      3,537       4,833       5,565        1,276       1,494
     Restructuring costs                                 -           -          -           -           -            -       2,189
                                                  --------    --------    -------    --------    --------     --------    --------
 Total operating expenses                           22,188      21,340     22,675      28,973      37,958        8,789       6,151
                                                  --------    --------   --------    --------    --------     --------    --------
 Loss from operations                              (20,828)    (19,130)   (19,269)    (25,473)    (35,298)      (7,914)     (6,151)
 Interest income                                     2,045       1,695      1,082       1,218         550          232          73
 Interest expense                                     (698)       (569)      (603)     (5,033)     (2,033)        (807)       (259)
                                                  --------    --------   --------    --------    --------     --------    --------
 Net loss                                          (19,481)    (18,004)   (18,790)    (29,288)    (36,781)      (8,489)     (6,337)

 Deemed dividend on Preferred Stock                      -           -          -           -      (1,742)           -      (2,273)
                                                  --------     --------  --------    --------    --------     --------    --------
 Net loss applicable to Common Stockholders       $(19,481)   $(18,004)  $(18,790)   $(29,288)   $(38,523)    $ (8,489)   $ (8,610)
                                                 =========   =========  =========   =========   =========    =========   =========
 Basic and diluted net loss per Common Share(1)   $ (30.02)   $ (27.36)  $ (27.85)   $ (34.44)   $ (38.31)    $  (9.52)   $  (5.18)
                                                 =========   =========  =========   =========   =========    =========   =========
 Shares used in calculation of basic and
   diluted net loss per Common Share(1)                649         658        675         850       1,006          892       1,663
                                                 =========   =========  =========   =========   =========    =========   =========


</TABLE>


<TABLE>

<CAPTION>
                                                                              December 31,                        March 31,
                                                        -----------------------------------------------------    ----------
                                                          1994        1995       1996       1997       1998         1999
                                                        --------    --------   --------   --------   --------    ----------
<S>                                                     <C>        <C>        <C>        <C>         <C>         <C>
Balance Sheet Data:
  Cash, cash equivalents, and short-term investments    $ 39,843   $ 26,665   $ 16,533   $ 21,421   $  9,165      $  2,711
  Working capital                                         33,422     22,850      9,641     14,547      1,043        (5,531)
  Total assets                                            49,673     33,810     22,377     26,753     13,139         6,323
  Long-term obligations, including current installments    5,017      6,041      4,816      6,802      5,219         4,287
  Senior convertible notes                                     -          -          -      9,967          -             -
  Accumulated deficit                                    (45,828)   (63,832)   (82,622)  (111,910)  (150,434)     (159,043)
  Total stockholders' equity (net capital deficiency)   $ 41,300   $ 24,205   $ 11,977   $  5,148   $  2,110      $ (4,167)


</TABLE>

- ----------

(1) Basic and diluted net loss per share is based on the weighted average number
of Common Shares outstanding during the period. We have not paid any cash
dividends on our capital stock since inception.


                                       23
<PAGE>


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


Overview

      We are focused on the discovery, development, and marketing of novel,
proprietary botanical dietary supplements derived from tropical plant sources.
We intend to develop and commercialize our Shaman-branded products through our
recently established botanicals division. We also have available for
out-licensing a pipeline of botanical product candidates, as well as novel
pharmaceutical products for major human diseases developed by isolating active
compounds from tropical plants with a history of medicinal use.

      Until December 1998, we were focused solely on developing pharmaceutical
products derived from tropical plant sources. Our pharmaceutical business model
was dependent upon our ability to launch our first pharmaceutical product in
1999. As a result of the U.S. Food and Drug Administration response to our
proposed fast-track (single-pivotal trial) New Drug Application package for our
leading pharmaceutical product candidate, SP-303/Provir, and insufficient
resources to continue the costly process of conducting a second pivotal trial
which would have created significant delays, we restructured our business to
focus on the development and marketing of dietary supplements.

Results of Operations for the Quarters Ended March 31, 1998 and 1999

      The results of operations for the quarter ended March 31, 1998 relate to
our pharmaceutical operations. Since we ceased operations of our pharmaceutical
business and focused our efforts in our botanical business in February 1999, our
results of operations for the quarter ended March 31, 1999 and future periods
are not comparable to the same periods last year.

Restructuring Expenses

      On February 1, 1999, we initiated a restructuring plan in which we closed
down the operations of our pharmaceutical business. We now intend to out-license
worldwide marketing rights to all our pharmaceutical compounds and will focus
our efforts on the development and commercialization of botanical dietary
supplements. The restructuring plan includes: cessation of pharmaceutical
research and development activities and related operations; outlicensing of all
of our current pharmaceutical research programs; reduction in force of
approximately 60 employees (65% of workforce; sale or disposal of all of our
fixed assets that are not needed for our botanicals business; and sub-leasing a
portion of our facility.

      The termination of 60 employees occurred on February 1, 1999. The
following table summarizes the Company's restructuring activities as of March
31, 1999.


<TABLE>
<CAPTION>


                                            Total
                                       Restructuring                Balance
                  Category                Charges     Spending   March 31, 1999
         ----------------------------  -------------  --------   --------------
               (in thousands)
<S>                                    <C>           <C>        <C>
        Severance and related charges    $   467       $   352       $   115
        Write-off impaired assets            122           122             0
        Cancellation of contracts          1,200             0         1,200
        Other                                400             0           400
                                        --------      --------      --------
                                         $ 2,189       $   474       $ 1,715
                                        ========      ========      ========

</TABLE>


      In addition, we have approximately $969,000 recorded as deferred revenue
for which we have not yet earned. We are currently in negotiations with
Lipha/Merck for the discontinuation of the research and development agreement.

      We recorded collaborative revenues of $875,000 and $0 for the quarters
ended March 31, 1998 and 1999, respectively. Revenues for the first quarter of
1998 resulted from research funding from Lipha S.A., a wholly-owned subsidiary
of Merck KGaA, Darmstadt, Germany ("Lipha/Merck") and research funding from our
collaboration with Ono Pharmaceutical Co. Ltd. of Osaka, Japan ("Ono"), which
expired in May 1998.



                                       24
<PAGE>


      In December 1998, we renegotiated the terms of the existing agreement with
Lipha/Merck. Under the new terms, we forgave $6.0 million in aggregate payments
due over the remaining term of the original agreement in exchange for a one-time
up-front payment of an aggregate of $2.0 million, consisting of a $1.0 million
research payment (which remains recorded as deferred revenue that we have not
yet earned) and a $1.0 million equity investment. We are currently in



negotiations with Lipha/Merck for the discontinuation of this agreement. There
will be no further research payments from Lipha/Merck.

      We incurred research and development expenses of $7.5 million and $2.5
million of which $149,000 was related to the research and development of the
botanicals division for the quarters ended March 31, 1998 and 1999,
respectively. This decrease was primarily attributable to the closing down of
our pharmaceutical business as of February 1, 1999. Research and development
expenses are expected to decrease in 1999 as we focus our efforts in our
botanicals business, effective February 1, 1999.

      General and administrative expenses were $1.3 million and $1.5 million for
the quarters ended March 31, 1998 and 1999, respectively. This increase was
primarily attributable to legal dispute costs. General and administrative
expenses are expected to decrease in 1999 since we have ceased operations in our
pharmaceutical business and focused our efforts in our botanicals business,
effective February 1, 1999.

      Interest income was $232,000 and $73,000 for the quarters ended March 31,
1998 and 1999, respectively. Interest income decreased for the period ended
March 31, 1999, compared with the period ended March 31, 1998, due to lower
average cash and investment balances as we continue to fund our operations.
Interest expense was $807,000 and $259,000 for the quarters ended March 31, 1998
and 1999, respectively. Interest expense decreased for the period ended March
31, 1999, compared with the period ended March 31, 1998 due to lower average
debt balances.



Results of Operations for the Years Ended December 31, 1996, 1997 and 1998

      The results of operations for the years ended December 31, 1996, 1997 and
1998 were for our pharmaceutical operations. Our results of operations for
fiscal year 1999 will not be comparable, as we ceased operations of our
pharmaceutical business and focused our efforts in our botanical business in
first quarter of 1999.

      We recorded collaborative revenues of $3.4 million, $3.5 million and $2.7
million for 1996, 1997, and 1998, respectively. Revenues for 1998 resulted from
research funding from our collaboration with Lipha/Merck and research funding
from our collaboration with Ono Pharmaceutical Co. Ltd. of Osaka, Japan ("Ono"),
which expired in May 1998. Revenues for 1997 also resulted from research funding
from our collaboration with Lipha/Merck and Ono. Revenues for 1996 resulted from
research funding from our collaboration with Ono, an additional $1.0 million
payment from Ono for enhanced rights to our antidiabetic compounds, and research
payments and access fees from our collaboration with Lipha/Merck.


      In December 1998, we renegotiated the terms of the existing agreement with
Lipha/Merck. Under the new terms, we forgave $6.0 million in aggregate payments
due over the remaining term of the original agreement in exchange for a one-time
up-front payment of an aggregate of $2.0 million, consisting of a $1.0 million
research payment (which remains recorded as deferred revenue that we have not
yet earned) and a $1.0 million equity investment. We are currently in
negotiations with Lipha/Merck for the discontinuation of this agreement. There
will be no further research payments from Lipha/Merck.


      We incurred research and development expenses of $19.1 million, $24.1
million, and $32.4 million for 1996, 1997 and 1998, respectively. These expenses
include salaries for scientific personnel, clinical development costs,
laboratory supplies, patent protection and consulting fees, travel, plant
collections, facilities expenses and other expenditures relating to research and
product development. Research and development expenses increased $5.0 million in
1997 compared with 1996, and $8.3 million in 1998 compared with 1997. The
increase in 1997 was primarily attributable to an increase in clinical
development activities with respect to SP-303/Provir of $3.8 million and to
increased scientific salaries of $1.2 million, which were partially offset by
reduced expenses for clinical development activities for nikkomycin Z of $1.1
million. The increases in 1998 were primarily attributable to the completion of
a $7.0 million Phase III human clinical trial for SP-303/Provir for the
treatment of diarrhea in people with AIDS and $2.4 million of the manufacturing
scale-up and to increased scientific salaries of $1.2 million, which were
partially offset by a reduction of costs associated with our diabetes program of
$2.8 million. Research and development expenses are expected to decrease in 1999
as we ceased operations in our pharmaceutical business and focused our efforts
in our botanicals business, effective February 1, 1999.

      General and administrative expenses were $3.5 million, $4.8 million and
$5.6 million for 1996, 1997 and 1998, respectively. These expenses include
administrative salaries, consulting, legal, travel and other operating expenses.
General and administrative expenses increased $1.3 million in 1997 compared to
1996, and increased $0.7 million in 1998 compared to 1997. The increase in 1997

                                       25
<PAGE>

was primarily attributable to an increase in compensation and marketing research
of $388,000 related to development of SP-303/Provir, as well as additional legal
expenses of $631,000 primarily related to certain disputes related to our
intellectual property rights. The increase in 1998 over 1997 was primarily
attributable to additional costs, including an increase in compensation,
consulting expenses and commercial development activities of $530,000, related
to the development of SP-303/Provir. General and administrative expenses are
expected to decrease in 1999 as we ceased operations in our pharmaceutical
business and focused our efforts in our botanicals business, effective February
1, 1999.

        Interest income was $1.1 million, $1.2 million and $0.6 million for
1996, 1997 and 1998, respectively. Interest income increased $100,000 in 1997
compared with 1996, and decreased $700,000 in 1998 compared with 1997. Interest



income fluctuations have been consistent with changes in average cash and
investment balances with which we substantially funded our operations in 1996,
1997 and 1998. The balances of cash, cash equivalents and investments were $16.5
million, $21.4 million and $9.2 million at December 31, 1996, 1997 and 1998,
respectively.

      Interest expense was $603,000, $5.0 million and $2.0 million for 1996,
1997 and 1998, respectively. Interest expense increased in 1997 compared with
1996 principally due to a $3.7 million non-cash interest charge related to the
issuance of senior convertible notes in June 1997, as well as the interest
expense related to our secured debt financing in May 1997. Interest expense
decreased in 1998 compared with 1997 principally due to a $3.7 million non-cash
interest charge related to the issuance of senior convertible notes in June
1997, offset by interest expense related to capital lease agreements and the
secured debt financing. Interest expense in the future will be dependent in part
on our capacity to finance future operating and equipment needs.

Delisting of our common stock from Nasdaq National Market

      The delisting of our common stock from The Nasdaq National Market on
February 2, 1999 constituted an optional redemption event for our Series D
Preferred Stock. Since we do not have adequate resources to pay to redeem the
Series D Preferred Stock, we have issued a notice to the holders of the Series D
Preferred Stock as required under our charter that prevented the redemption of
the Series D Preferred Stock. Under the terms of our charter, the effect of
preventing this redemption event by issuing the notice was to increase the
annual cumulative dividend payable to the Series D Preferred Stock holders to
$180 per share and to adjust the conversion price of the Series D Preferred
Stock to 72% of the lowest trading price for a designated period prior to the
conversion. The notice preventing the redemption of the Series D Preferred Stock
will remain in effect for as long as our securities are not listed on any of The
Nasdaq National Market, The Nasdaq SmallCap Market, the American Stock Exchange
or the New York Stock Exchange. In connection with the issuance of such notice,
we recorded a deemed dividend charge in the amount of $2,273,614 in the first
quarter of 1999.


      At December 31, 1998, we had federal net operating loss carryforwards of
approximately $48.6 million. The federal net operating loss carryforwards will
expire at various dates beginning in 2004 through 2013, if not sooner utilized.
Utilization of the net operating losses and credits is subject to a substantial
annual limitation due to the "change in ownership" provisions of the Internal
Revenue Code of 1986, as amended. The annual limitation may result in the
expiration of net operating losses and credits before utilization.

Liquidity and Capital Resources


      As of March 31, 1999, our cash, cash equivalents, and investments totaled
approximately $2.7 million, compared with $9.2 million at December 31, 1998. We
invest excess cash according to our investment policy that provides guidelines
with regard to liquidity, type of investment, credit ratings and concentration
limits.

      In April 1999, we entered into a credit facility and note purchase
agreement with certain investors, stockholders, key executives and members of
the board of directors (the "Credit Agreement"), pursuant to which we may borrow
up to $1.0 million at any time commencing on May 14, 1999 and until the earlier
of the completion of a registered public offering of our equity securities, or
September 1, 1999 (the "Convertible Promissory Notes"). The Convertible
Promissory Notes will be due and payable on the earlier of (i) 30 days
subsequent to the completion of the public offering, or (ii) December 31, 1999.
Interest on the Convertible Promissory Notes will accrue at an annual rate of
12%. The Convertible Promissory Notes, when issued, will be secured by certain
assets of Shaman and will be convertible into shares of the class and series of
equity securities offered by us in the first registered public offering effected
by us after the date of the Credit Agreement, or into common stock if no such
offering occurs prior to December 31, 1999. In connection with the Credit
Agreement, we issued warrants to purchase shares of the same class and series of
equity securities as those into which the debt is convertible. The number of
shares subject to these warrants is equal to 50% of the debt amount divided by
the per share sale price of the shares sold in the public offering. These
warrants are exercisable, on a cashless basis, commencing on April 5, 1999, and


                                       26
<PAGE>

through the third anniversary date of the public offering. The conversion price
of the Convertible Promissory Notes and the exercise price of the warrants is
equal to the per share offering price in the public offering. If a public
offering is not completed prior to December 31, 1999, then the conversion price
of the Convertible Promissory Notes and the exercise price of the warrants will
be the lower of $0.05 per share of our common stock, or 1/3 of the five-day
weighted average trading price of our common stock for the period ending three
trading days prior to conversion or exercise.


      On December 10, 1998, we and certain institutional investors exchanged an
aggregate of $4.8 million (including accrued interest) of the Senior Convertible
Notes for an aggregate of 4,784 shares of our Series D Convertible Preferred
Stock. Each share of Series D Convertible Preferred Stock is entitled to
receive, when, as, and if declared by the Board of Directors out of funds
legally available for such purpose, cumulative dividends at the rate of $55 per
annum. Dividends on the Series D Preferred Stock are payable in cash or shares
of common stock or any combination of cash and shares of common stock, at our
option and are payable quarterly on February 1, May 1, August 1 and November 1
of each year. Each share of Series D Preferred Stock is convertible, at any
time, into the common stock at the lesser of (a) $22.50 per share or (b) 90% of
the low trading price during a designated time period prior to the conversion.
In addition, the holders received an aggregate of 38,373 warrants to purchase
additional shares of common stock in exchange for surrendering the redemption
rights previously held by them under the Notes. The warrants were priced at 150%
of the average closing price for the month of December 1998. We have attributed
a value of $943,680 to these warrants.

      The delisting of our common stock from The Nasdaq National Market
constituted an Optional Redemption Event (as defined in the Certificate of
Designation of Series D Preferred Stock) for the Series D Preferred Stock. In
connection therewith, on February 4, 1999, we issued a Control Notice (as
defined in the Certificate of Designation of Series D Preferred Stock) that
prevented the redemption of the Series D Preferred Stock. This Control Notice
will remain in effect for as long as we are not listed on any of The Nasdaq
National Market, The Nasdaq SmallCap Market, the American Stock Exchange or the
New York Stock Exchange. Delivery of the Control Notice had the effect of
increasing the annual dividend to $180 per share and adjusting the conversion
price of the Series D Preferred Stock to 72% of the low trading price during a
designated time period prior to the conversion.

      In December 1998, we completed a private sale of 240,604 shares of common
stock for aggregate net proceeds of approximately $7.1 million. In connection
with this offering, we have committed a five-year, 3.6% royalty on net sales of
SP-303/Provir, if any, in the United States for distribution to HIV/AIDS
charities. We intend to honor this royalty payment through the sale of our first
botanical product, if any.

      In December 1998, we issued 37,360 shares of common stock to consultants
for services rendered. We recorded an expense of approximately $1.1 million in
conjunction with the consulting services.

      In October 1998, we completed the sale to the public of an aggregate of
140,880 shares of our Series C Convertible Preferred Stock for aggregate gross
proceeds of $14.1 million. Each share of Series C Preferred Stock is entitled to
receive cumulative dividends paid semi-annually to the holders of record of such
shares as follows: (i) an annual stock-on-stock dividend, paid in arrears, in
shares of common stock (calculated as the quotient of $10.00 divided by 85% of
the average closing price of the common stock for the 10-day trading period
ending three trading days prior to the date the dividend is paid); plus (ii) a
cash amount equaling 0.00005% of our U.S. net sales of our SP-303/Provir product
for the treatment of diarrhea, if any, for the preceding two calendar quarters
less $5.00. If, under Delaware law, we are unable to pay the cash portion of the
dividends, then the cash portion will be paid in shares of common stock (valued
at 85% of the average closing price of the common stock for the 10-day trading
period ending three trading days prior to the date on which the dividend is
paid). We intend to honor this royalty portion of the dividend through the sale
of our first botanical product, if any. Each share of the Series C Preferred
Stock was convertible for a period of 30 days after the first issuance (August
18, 1998) and will be convertible again commencing 12 months after the initial
issuance date at the election of each holder, and automatically on the sixth
anniversary of the initial issuance date into the greater of (a) 0.8333 shares
of common stock or (b) such number of shares of common stock as equals $100 (the
price paid per share of Series C Preferred Stock) divided by 85% of the average
closing price of the common stock reported by Nasdaq for the 10-day trading
period ending three trading days prior to the date of conversion. The common
stock is currently trading on the OTC Bulletin Board. During the initial 30-day
conversion period for the Series C Preferred Stock, 24,922 shares of the Series
C Preferred Stock were converted into an aggregate of 93,077 shares of common
stock. In connection with the issuance of the Series C Preferred Stock, we
recognized a non-cash charge in the amount of $679,000.

      In June 1998, we entered into Stock Purchase Agreements with certain of
our stockholders (the "Buyers") pursuant to which we acquired the right to sell
to the Buyers, subject to certain conditions up to an aggregate of 7,000 shares
of Series B Custom Convertible Preferred Stock for an aggregate purchase price
of $7,000,000. The Stock Purchase Agreements were terminated upon the closing of
the Series C Convertible Preferred Stock Financing in October 1998. As


                                       27
<PAGE>

consideration for entering into the Stock Purchase Agreements, we issued to the
Buyers warrants to purchase an aggregate of 17,500 shares of common stock. The
warrants are exercisable for a period of five years at an exercise price per
share equal to 115% of the average trading price of the common stock during
specified measurement periods. We have attributed a value of $1.5 million to
these warrants.

      In June 1997, we issued $10.4 million of Senior Convertible Notes. The
notes mature in August 2000 and bear interest at a rate of 5.5% per annum.
Interest on the notes was payable in common stock or cash at our option.
Initially, the notes were convertible into common stock at 100% of the low
trading price during a designated time period prior to conversion provided that
the conversion price would not be less than $110.00 per share. Starting in
November 1997, the notes were convertible into common stock at a 10% discount
from the low trading price during a designated time period prior to the
conversion, with a floor of $110.00 through March 31, 1998, pursuant to a
November 1997 understanding with the note holders to revise the terms of the
notes (see next paragraph). Of the notes issued, $400,000 was issued to the
placement agent as part of the placement fee. We paid the placement agent an
additional $300,000 in cash. The placement fees and other offering costs were
capitalized in other assets as deferred issuance costs and were amortized to
interest expense over the life of the notes to the extent the notes were not
converted to common stock. The net proceeds totaled approximately $9.5 million
after the placement agent's fees and other offering expenses.

      In March 1998, we and the purchasers of the notes entered into an
Amendment Agreement (the "Amendment Agreement") with the purchasers of the notes
in order to avoid conversion of the notes at a price that would be unduly
dilutive to our existing stockholders. As consideration for entering into the
Amendment Agreement, we issued to the purchasers of the notes warrants to
purchase an aggregate of 6,875 shares of common stock. The warrants are
exercisable through March 18, 2001 at an exercise price of $150.00 per share. We
have attributed a value of $309,000 to these warrants. On December 10, 1998, we
issued to the note holders an aggregate of 4,784 shares of the Series D
Convertible Preferred Stock in exchange for the cancellation of an aggregate of
$4.8 million (including accrued interest) of the notes.

      In May 1997, we obtained a $5.0 million, 36-month term loan to pay off
pre-existing debt, finance capital asset acquisitions and finance continued
research and clinical development of our product candidates. The loan carries an
interest rate of 14.58% and is payable in equal monthly installments over the
term of the loan. The lender was granted ten-year warrants to purchase 10,000
shares of common stock at $125.00 per share. We have attributed a value of
$648,000 to these warrants.

      In April 1997, we sold 80,000 shares of common stock at $99.40 per share
in a registered direct public offering, which yielded gross proceeds of $7.95
million. The net proceeds of approximately $7.8 million from this offering were
used for the continued research and clinical development of our product
candidates.


      In January 1997, we sold 100,000 shares of common stock in a registered
direct public offering for gross proceeds of $9.0 million. The net proceeds of
approximately $8.1 million from this offering were used for the continued
research and clinical development of our product candidates.


      In September 1996, we entered into a five-year collaborative agreement
with Lipha/Merck to jointly develop our antihyperglycemic drugs. Upon signing
the collaboration, we received an annual research fee of $1.5 million which was
amortized to revenue over twelve months, as work was performed. We also received
approximately $3.0 million for 19,446 shares of common stock priced at $154.20
per share, representing a 20% premium to the weighted average price of the
common stock at the time of purchase. In exchange for development and marketing
rights in all countries except Japan, South Korea, and Taiwan (which are covered
under an earlier agreement between Shaman and Ono), Lipha/Merck agreed to
provide up to $9.0 million in research payments and up to $10.5 million in
equity investments priced at a 20% premium to a multi-day volume weighted
average price of the common stock at the time of purchase. The agreement also
provided for additional preclinical and clinical milestone payments to us in
excess of $10.0 million per compound for each antihyperglycemic drug developed
and commercialized. Lipha/Merck agreed to bear all pre-clinical, clinical,
regulatory and other development expenses associated with the compounds selected
under the agreement. In addition, as products are commercialized, we would
receive royalties on all product sales outside the United States and up to 50%
of the profits (if we exercised our co-promotion rights) or royalties on all
product sales in the United States. Certain of the milestone payments would be
credited against future royalty payments, if any, due to us from sales of
products developed pursuant to the agreement.

      In December 1998, we renegotiated the terms of the existing agreement with
Lipha/Merck. Under the new terms, we forgave $6.0 million in aggregate payments
due over the remaining term of the original agreement in exchange for a one-time
up-front payment of an aggregate of $2.0 million, consisting of a $1.0 million
research payment (which remains recorded as deferred revenue that we have not
yet earned) and a $1.0 million equity investment.


                                       28
<PAGE>

      For the year ended December 31, 1998, we recognized $1.9 million in
revenue from the Lipha/Merck collaboration. In addition, we received a total
$2.5 million for issuance of 57,762 shares of common stock (40,650 shares priced
at $37.00 per share in September 1998 and 17,112 shares priced at $58.40 per
share in December 1998), each representing a 20% premium to the weighted average
price of the common stock at the time of purchase.

      On February 1, 1999, we discontinued all the research and development
activities related to the collaborative agreement. We are currently in
negotiations with Lipha/Merck for the discontinuation of this research
agreement. There will be no further research payments from Lipha/Merck.

      In July 1996, we closed a private placement pursuant to Regulation S under
the Securities Act of 1933, as amended, in which we received gross proceeds of
$3.3 million for the sale of 400,000 shares of Series A Convertible Preferred
Stock and for the issuance of a six-year warrant to purchase 27,500 shares of
common stock at an exercise price of $203.60 per share. The Preferred Stock does
not carry a dividend obligation and will convert into common stock no later than
July 23, 1999 at a price per share between $120.00 and $163.00, depending on the
market value of common stock during the period prior to conversion. The holder
of preferred shares is entitled to a liquidation preference of $163.00 per
share.


      We have incurred substantial additional costs in the first quarter of 1999
relating to our restructuring in February 1999. We expect to continue to incur
losses at least through 1999. Our cash, cash equivalents and investment balances
are approximately $2.7 million at March 31, 1999. We anticipate that our cash,
cash equivalents and investment balances, and the net proceeds from this
offering, assuming all of the shares are sold in the offering, will be adequate
to fund our operations through at least the end of 1999. Our projections show
that cash on hand plus approximately $1.0 million available under the Credit
Agreement will be sufficient to fund operations at the current level through
mid-August, 1999. Unless we are successful in our efforts to sell or out-license
our pharmaceutical products, or to sell or establish collaborative agreements to
sell our botanical products, we will be unable to fund our current operations
beyond mid-August, 1999. In addition, unless we are successful in our efforts to
raise additional capital through this offering or other offerings of equity
securities, to sell or out-license our pharmaceutical products, or to sell or
establish collaborative agreements to sell our botanical products, our cash
resources will be used to satisfy our existing liabilities, and we will
therefore be unable to fund the operations of our botanicals business, which may
result in significant delay of our planned activities or the cessation of
operations. Even if we are successful in these efforts to raise additional
funds, such funds may not be adequate to fund the operations of our botanicals
business on a long-term basis. If additional funds are raised by issuing equity
securities, significant dilution to existing stockholders may result and there
can be no assurance that additional funding will be available on reasonable
terms, or at all.


Year 2000 Compliance


      The year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year. Any of our computer
programs or hardware that have date-sensitive software or embedded chips may
recognize a date using "00" as the year 1900 rather than the year 2000. This
could result in a system failure or miscalculations causing disruptions of
operations, including, among other things, a temporary inability to process
transactions or engage in similar normal business activities.


      Based on recent assessments, we have determined that we will be required
to certify portions of our software and certain hardware so that those systems
will properly utilize dates beyond December 31, 1999. We presently believe that
with modifications or replacements of existing software and certain hardware,
the year 2000 issue can be mitigated. We believe that such modification and
replacements are not significant, and should such modification and replacements
be delayed there would be no material impact on our operations.


      We are approximately 85% complete with the assessment of all internal
systems that could be significantly affected by the year 2000. To date, all
assessments have been performed by our employees, and we have therefore not
incurred any external costs. We estimate that upgrades for those systems not in
compliance will total approximately $280,000. After the assessment phase is
completed, we will have to purchase, install and test the upgrades to ensure
they meet internal year 2000 compliance. We expect to complete our internal year
2000 readiness program in the third quarter of 1999. We are in the process of
asking our significant suppliers and subcontractors that do not share
information systems with us (external agents) whether their systems are year
2000 compliant. To date, we are not aware of any external agent with a year 2000
issue that would materially impact our results of operations, liquidity, or
capital resources. However, we have no means of ensuring that external agents
will be year 2000 ready. The inability of external agents to complete their year
2000 resolutions to process in a timely fashion could materially impact us.


                                       29
<PAGE>

      We currently have no contingency plans in place in the event we do not
complete all phases of the year 2000 program. We plan to evaluate the status of
completion in second quarter 1999 and determine whether such a plan is
necessary.


Qualitative and Quantitative Disclosures About Market Risk

      We are exposed to market risk, including changes to interest rates. A
discussion of our accounting policies for financial instruments and further
disclosures relating to financial instruments is included in the Summary of
Significant Accounting Policies in the Notes to Financial Statements.

      We monitor the risks associated with interest rates and foreign currency
exchange risks and have established policies and business practices to protect
against these and other exposures. We place our investments in instruments that
meet high credit quality standards, as specified in our investment policy
guidelines; the policy also limits the amount of credit exposure to any one
issue, issuer, or type of instrument and does not permit derivative financial
instruments in our investment portfolio. As a result, we do not expect any
material loss with respect to our investment portfolio.

      The following table provides information about our financial instruments
that are sensitive to changes in interest rates. For investment securities, the
table presents principal cash flows and related weighted-average interest rates
by expected maturity dates.

<TABLE>
<CAPTION>
                                                                                                    Fair Value
                                                                                                        at
                               1999      2000      2001      2002     2003   Thereafter     Total     12/31/98
                               ----     ----       ----     ----     ----   ----------     -----     --------
<S>             <C>        <C>    <C>    <C>    <C>    <C>
ASSETS
- ------------------------
(in thousands)

Cash equivalents             $2,955        -         -         -        -           -     $2,955       $2,945
Weighted average
 interest rate                 5.28%

Short-term investments       $3,282        -         -         -        -           -     $3,282       $3,277
Weighted average
 interest rate                5.76%

LIABILITES
- -------------------------
(in thousands)

Long-term debt, including
 current portion

Fixed rate                   $2,973   $1,371       $540     $540       -           -         $5,424   $4,628
Weighted average
 interest rate                13.64%   13.56%     12.00%   12.00%


</TABLE>

                                       30
<PAGE>

                                BUSINESS

This prospectus also contains, in addition to historical information,
forward-looking statements that involve risks and uncertainties. Our actual
results could differ materially from those anticipated in these forward-looking
statements as a result of certain factors, including the risks faced by us
described below and elsewhere in this prospectus.

Overview


      We are focused on the discovery, development, and marketing of novel,
proprietary botanical dietary supplements derived from tropical plant sources
via our ShamanBotanicals.com division. We also have available for out-licensing
a pipeline of botanical product candidates, as well as novel pharmaceutical
product candidates for major human diseases developed by isolating active
compounds from tropical plants with a history of medicinal use.


Botanicals

Background

      In 1997, the U.S. dietary supplement market was $12.9 billion. Of this,
over $4.0 billion were herbal or botanical dietary supplements. In 1998, this
number was projected to reach $5.0 billion, with a compounded yearly growth rate
of 15% to 25%. In 1997, 24% of U.S. households reported using herbal or
botanical dietary supplements. The growth of this market has been led by
consumers who are interested in complementary, non-pharmaceutical options for
treating symptoms, fulfilling unmet dietary needs, and optimizing health, either
as an alternative to, or in conjunction with, more conventional medical
approaches. We believe that the use of these products will continue to expand
based upon the aging of the population, increasing scientific evidence and
acceptance by the conventional medical establishment, and the recent entrance of
powerful consumer companies which provide greater product confidence, while
growing the base of consumer users.

      We believe that room exists for significant continuing growth of the
dietary supplement market and expect the two key drivers of market growth to be
(1) growth in the number and breadth of consumers utilizing these products; and
(2) continuing effective product innovation to fuel both trial and repurchase.

      Growth in the number and breadth of consumers utilizing these products has
already begun, and is based in part upon the entrance of the large consumer
healthcare companies into the botanical dietary supplements market. These
companies have increased the visibility of botanical dietary supplements,
placing them not only in local health food stores but also in neighborhood
grocery stores, drug stores, and mass merchandisers. Additionally, these
companies are spending on large direct-to-consumer advertising campaigns,
placing advertisements during primetime television and in mainstream newspapers
and magazines. Consumer surveys show this advertising has resulted in a broader
base of consumers being made aware of, trying and utilizing dietary supplements.

      Simultaneous with the broadening of the consumer base, the botanical
dietary supplements market has grown partially as a result of the media
highlighting new products. For example, in 1997, ABC's 20/20, The New York Times
and Newsweek carried a series of stories about St. John's wort, increasing trial
and usage of this dietary supplement dramatically. Interestingly, while the
month-on-month growth of sales of St. John's wort has now slowed, this initial
increase in sales has been maintained throughout the industry. These new product
"bursts" have fueled episodic but sustained market growth by driving new
purchases, and in the process, the repurchase of other products once the
consumer is at the point of purchase. Hence, the industry's view is that the
media and consumers are looking for continuing effective product innovation--for
the next St. John's wort--to fuel both trial and repurchase. Products with a
proprietary position have proven to be particularly successful in the past.

      Finally, as more consumers have entered the dietary supplement market,
they have also begun to demand better quality, more consistency and
standardization of products, and scientific evidence regarding the safety and
efficacy of products. Increased demand has also strained the supply of natural
plant material for some popular products. Not all companies in the industry have
proven capable of meeting these consumer demands.

Strategy


      The concept for our ShamanBotanicals.com division was developed in 1998,
and we have become the focus of our operations in 1999. The purpose of the
botanicals business is to discover, develop and market novel, proprietary
botanical dietary supplements derived from tropical plant sources. The unique
positioning of our botanicals business stems from our prior experience and


                                       31
<PAGE>

efforts in developing pharmaceutical products from tropical plant sources,
including significant financial investment, more than 10 years of extensive
field research by our teams of ethnobotanists and physicians, and
pharmaceutical-level chemical standardization, biological and clinical testing.
We are applying this methodology to our new industry, and we intend to set a new
standard in this industry. In the last decade, we have amassed a large body of
information on the health benefits of thousands of tropical plant species that
have a history of human use, and we have organized this information into an
extensive relational database. This database includes over 2,600 tropical
plants, many of which have not been introduced or fully developed in the U.S.
dietary supplement market. We have identified plants with a documented
ethnomedical history of use in our library and database of botanicals for use in
key market categories with significant commercial potential. Because many of
these plants reflect the previously untapped plant diversity of the rainforests,
they may represent novel botanical products that have the opportunity to attain
a strong, proprietary market position. We currently have a fully-developed
product, SB-300, and we expect to commercialize this product in the near future
by applying the funds raised in this rights offering and via partnering
development agreements we are working to put in place.


     We have the opportunity to differentiate our product candidates in
consumers' minds relative to those of our competitors. Key points of
differentiation include:


     - Novel plants/products for unmet needs;
     - Documented, first-hand field experience with traditional use;
     - Rainforest-based plants and products (most current botanical
       supplements products come from plants in temperate regions);
     - Our commitment to conservation and reciprocity;
     - Sustainable sourcing and supply;
     - Quality manufactured, standardized products; and
     - Clinically-tested products.



      Our marketing strategy for dietary supplements involves a step-wise
product introduction and distribution approach. We plan to launch our first
product, SB-300, a product to prevent water loss and promote normal bowel
function, to the HIV/AIDS Community through the Internet, on our website
ShamanBotanicals.com, and through direct response marketing. We may also market
SB-300 to the acute watery diarrhea or traveler's diarrhea markets, again via
the Internet, possibly in conjunction with an Internet site partner. We believe
that selling a traveler's health-related product on the Internet presents an
attractive marketing opportunity since the two primary uses of the Internet are
currently healthcare information and travel. Next, we plan to partner and
possibly co-brand with first-rate, quality partners in the three key growth
channels of distribution: mass market, Internet, and multi-level (or network)
marketing. Finally, building on the expected growing recognition of the Shaman
brand name (to be built in the future by product introduction), we plan to
broaden our Internet presence both within the HIV/AIDS niche and beyond to
include a full line of Shaman Botanicals, and will also explore niche retail
opportunities. We currently do not intend to target the traditional health food
markets due to the fragmented and crowded space and difficulty in achieving
product differentiation and satisfactory margins.


Product Discovery and Development Process

      We build on the knowledge and expertise of ethnobotanist and physician
teams who work with traditional healers to identify effective treatments in the
therapeutic areas that we have targeted. These teams gather comparative data on
traditional medicinal and health uses of plants from geographically diverse
tropical areas and prioritize plant candidates based on common use among
cultures and other factors. The prioritization process includes cross-checking
field-derived information against the results of literature searches as to
chemical constituents, previously discovered biological activity and other
reported medicinal uses. This process is integral to both our pharmaceutical and
dietary supplement discovery and development programs.

      We were able to initiate our botanicals business by further exploring the
botanical library and pipeline we have developed over the past 10 years. In the
last decade, we have amassed a large body of information on the healing benefits
of thousands of tropical plant species that have a history of human use and have
organized this information into an extensive relational database. This database
includes information on over 2,600 tropical plants, many of which have not been
introduced or fully developed in the U.S. dietary supplement market. Currently,
most dietary supplements are derived from plants from temperate regions. We have
identified plants with a documented ethnomedical history of use in our library
and database of botanicals for use in key market categories with significant
commercial potential.

      We intend to differentiate ourselves within the botanical dietary
supplement marketplace by backing novel products and promotion with quality
research, development and manufacturing, a carry-over from our pharmaceutical
culture and skill base. Given consumer demand for quality and the relative lack
of specific regulatory standards in the dietary supplement industry, we intend


                                       32
<PAGE>

to set our own high standard for quality and product standardization for our
botanical products. We intend to develop chemical markers and standardization
processes for all our products, including safety verification and, where
appropriate, human clinical testing of potential products. Once completed,
published clinical data can be utilized for educational purposes with consumers
and retailers seeking more information about our products. This distribution of
"third party" literature for education and promotional sales can be particularly
effective with Internet purchases. We believe that these elements, along with
unique formulations and existing and future patents, should add to the
proprietary position of our products.

Product Candidates

      We have strategically identified multiple areas of dietary supplement
product interest and have identified specific priority product candidates based
on four criteria:

     - key market categories with significant commercial potential,
     - the needs of an aging demographic in the U.S. population,
     - areas where quick, symptomatic relief could be observed, and
     - areas where we have first-hand ethnomedical experience and
       where sustainable supply of raw materials exists.

      Some of these proposed product areas include gastrointestinal relief,
energy boosters, sexual function aids, antioxidants, sleeping aids, calming
agents and weight management.

      We expect that our first dietary supplement product will be SB-300,
designed to prevent water loss and promote normal bowel function. SB-300 is an
extract of Croton lechleri, a plant used by indigenous people for relief of
gastrointestinal symptoms, and contains a chemical marker, SP-303, a patented,
clinically proven antidiarrheal and to the traveler's market. SB-300 also has a
patented formulation. We plan to market this product ourselves initially to the
HIV/AIDS Community and to the traveler's market through direct response and
Internet channels. We are also exploring other products appropriate for use by
the HIV/AIDS consumer which could be sold on our website, including some
products currently available on the market, nutritional multi-compound "systems"
specifically designed to meet the needs of people with HIV/AIDS, as well as
future applications of our own novel, proprietary products.

      In addition to SB-300, our two near-term product lines are the "Croton
Line," which currently includes four product candidates, and the
"EthnoEssentials Line" which includes multiple product candidates culled from
our ethnomedical library.

      The Croton Line is currently a series of four product candidates, all of
which are derived from the Croton lechleri tree that grows abundantly in South
America. Drawing from knowledge of traditional uses, the material from different
parts of the tree will serve as the basis for our products. This concept of
basing a line of products on a single plant with multiple known traditional uses
has been a successful model in the natural products sector, including product
lines based on hemp and the tea tree. We expect that our Croton Line of products
could include:

     - SB-300,  an oral  dietary  supplement  to  prevent  water loss and
       promote normal bowel function for the traveler's market made from a
       portion  of the latex or sap of the tree that  includes  a compound
       with clinically proven antidiarrheal activity;
     - IBS-400,  an oral dietary  supplement  that helps  support  normal
       stomach and bowel function and includes a clinically proven
       antidiarrheal  component along with three other recognized products
       clinically proven to relieve common  symptoms of irritable  bowel
       syndrome in a unique patented formulation;
     - Cold Sore-CL,  a topical cold sore product made from a broader cut
       of the latex (a by-product of making SB-300 and IBS-400)  that
       includes two active compounds,  one with clinically-tested
       anti-herpes activity and another with documented wound healing
       effects;
     - AntiOx-CL,  an oral dietary  supplement  made from bark  remaining
       after extracting  the latex and which includes recognized
       antioxidant compounds.

      The Croton Line also presents a compelling conservation story, since
nearly every part of the plant can be efficiently utilized in the production
process.

      The EthnoEssentials Line is expected to be initially a series of six
products, with additional products from the botanical library expected to follow
over time. The common elements of the product line will be the products'

                                       33
<PAGE>

tropical rainforest origins, history of traditional use and first-hand
ethnomedical validation, and the sustainably harvested, responsible sourcing of
their raw material. According to our research in the botanicals industry, we
believe there are currently no other product lines in the U.S. based solely on
rainforest and ethnomedical roots. We therefore should be able to create a novel
space in the market, similar to what has previously been done by product lines
focused on Chinese herbs or Ayurvedic botanicals.

      The EthnoEssentials Line of products is expected to include:

          -  Ethno-Energy, a dietary supplement to promote and
             maintain energy;
          -  Ethno-Ox, a dietary supplement with antioxidant
             properties;
          -  Ethno-Calm, a dietary supplement to promote and maintain
             a sense of well-being;
          -  Ethno-Rest, a dietary supplement to promote restful sleep;
          -  Ethno-Fit, a dietary supplement to maintain weight; and
          -  Ethno-Vigor, a dietary supplement to promote vigor and
             performance, for both males and females.

      The EthnoEssentials Line could feature packaging that includes stories and
pictures relating to the traditional origins of the products, including
geography, tribes, and folklore. In addition to the attractive rainforest and
traditional use themes of this line, the EthnoEssentials Line can feature
packaging and labeling highlighting our commitment to reciprocity of the
cultures and peoples with which we work, as well as our attitude towards
conservation and sustainable harvesting. We can further highlight the Healing
Forest Conservancy, a non-profit organization supported by us and dedicated to
maintaining biological and cultural diversity in rainforest areas. See
"Business--Community Commitment--The Healing Forest Conservancy." Highlighting a
company's commitment to causes has been successful in other consumer products
models, such as Ben & Jerry's Homemade Inc.'s "1% for Peace," a commitment to
give one percent of profits to organizations supporting disarmament.

      Another potential product opportunity is a proprietary, enhanced
formulation of one of the world's leading phytomedicines. We have filed a patent
application for this product. We believe this product represents a significant
out-licensing opportunity.

      All of these potential products are based on plant material on the
grandfathered old dietary ingredient list of the FDA, allowing for immediate
product introduction without a need for regulatory application or approval.

      We believe our current and prior research and development efforts would
allow us to introduce up to ten products, including human clinical testing,
within the first two years of our botanicals operations. We believe that all of
these product areas offer significant opportunity for growth. With the exception
of SB-300, we intend to secure corporate partners for the development and
commercialization of all of these products.

Sales and Marketing

      Our marketing strategy for dietary supplements involves a step-wise
product introduction and distribution approach. We plan to launch our first
product, SB-300, to the HIV/AIDS Community through the Internet on our web site
at ShamanBotanicals.com, direct response marketing and targeted access to mail
order and urban pharmacies catering to the needs of the HIV community. SB-300
could be further leveraged by targeting the acute watery diarrhea or traveler's
diarrhea market, again via the Internet, and specifically through an exclusive
or semi-exclusive Internet site partner. Selling a traveler's health-related
product is a natural since the two main uses of the Internet are healthcare
information and travel. Next, we plan to partner and possibly co-brand with
first-rate, quality partners in the three key growth channels of distribution:
mass market, Internet and multi-level (or network) marketing. Finally, building
on the expected growing recognition of the Shaman brand name (to be built by
product introduction), we plan to broaden our Internet presence both within the
HIV/AIDS niche and beyond to include a full line of botanical products, and will
also explore niche retail opportunities. We currently do not intend to target
the traditional health food sector.

      With respect to promotion, we anticipate that we will be responsible for
the cost of promotion only in the Internet/direct response channel for SB-300.
We expect to enter into partnerships with large consumer healthcare and dietary
supplement companies to sell our products through other marketing channels and
that these partners will be responsible for promotion of the products. We intend
that each of our partners will commit to a sufficient level of promotional
support for our products, including prominent use of the Shaman brand name.


                                       34
<PAGE>

Customers and Partners

      The market for dietary supplements in the United States is growing. In
recent consumer surveys, 25% to 30% of consumers report having utilized a
botanical dietary supplement, and 36% report moderate to heavy use of
complementary medicine.

      We believe that our botanicals business has two key initial classes of
customers: consumers, primarily in the HIV/AIDS Community and the traveler's
market, who could purchase our first product, SB-300, designed to prevent fluid
loss and normalize bowel function; and mass market, Internet and multi-level
companies that are interested in licensing or partnering with us for the
commercialization of our products.

      Potential SB-300 customers

      Diarrhea in people with HIV and AIDS is a devastating syndrome. In 1997 in
the United States, there were an estimated 225,000 people with AIDS and between
650,000 and 900,000 individuals in the United States were believed to be
infected with HIV. While fewer people are dying of AIDS, new cases of AIDS and
HIV are still increasing and people are now living longer with both AIDS and
HIV. Sources indicate that, of the combined HIV and AIDS population in the
United States, approximately 20% to 40% suffer from diarrhea at any given time,
with an average duration of 90 days per year. Although protease inhibitors and
highly active antiretroviral therapy have improved the prognosis for people
living with HIV and AIDS, the problem of diarrhea persists. In the majority of
cases the symptom is thought to be drug-related. Diarrhea therefore remains a
serious problem that has not been adequately addressed.

      Diarrhea not only compromises the health and quality of life of
individuals with AIDS and HIV but also has been shown to increase dramatically
the cost of these individuals' medical care. Furthermore, people with chronic
diarrhea are forced to restrict their daily activities to accommodate the
disruptions caused by this condition because current symptomatic therapies
provide either poor relief or undesirable side-effects.

      We believe that a product that prevents water loss and normalizes bowel
function, while positively impacts health and quality of life and reduces the
cost of health care represents a large, focused and untapped market opportunity.
We believe that the competitive promotional response may be limited in this
discrete market because no specific dietary supplements or over-the-counter
antidiarrheals have targeted this population to date, likely because there are
no indication or studies in this patient population. Further, we hope eventually
to build a niche market position by catering specifically to the needs of the
HIV/AIDS Community with a full product line.

      For the traveler's market, SB-300 provides a natural alternative to
currently available treatments which have unpleasant side effects. More than 35
million individuals travel annually to countries that present the risk of
traveler's diarrhea.

      Potential Partners

      We are actively engaged in partnering discussions with top tier companies
in both the mass market and multi-level dietary supplement arenas. No agreements
have been reached or entered into to date. We expect to close deals in the
multi-level market arena first, with a large mass market, heavily promotional,
co-branding healthcare deal requiring several months of negotiation.

      Mass Market

      The entrance of large healthcare and consumer products companies into the
dietary supplement industry has fueled the expanded placement of botanical
dietary supplements beyond local health food stores and into neighborhood
grocery stores, drug stores and mass merchandisers. To promote this placement,
these companies are spending huge sums on advertising and promotion relative to
previous marketing budgets for dietary supplements that rarely topped $1
million. For example, in 1998, American Home Products Corporation spent an
estimated $12 million on its Centrum(R) line, Bayer Corporation spent an
estimated $35 million on its One-A-Day(R) line of eight products, and
Warner-Lambert Company spent an estimated $15 million on its Quanterra(R) line
of two products. Such large promotional expenditures are relatively recent
because historically sales of single products or even lines of products rarely
passed the single-digit million mark. However, industry analysts now report much
higher sales figures. For example, American Home Products, Bayer and
Warner-Lambert are forecasting combined first year sales of over $100 million
for their botanical lines, largely a result of significant promotion. Through
increased promotional budgets, companies such as these are educating more
consumers about the benefits of herbal and botanical products, thereby
increasing consumer trial and repurchase. If these trends continue, the growth


                                       35
<PAGE>

of the botanical dietary supplement market could far surpass growth in the past.
Each of these product lines is simply a new opportunity of commodity botanical
products.

      We believe that another key driver of continued growth will be the
introduction of new botanical dietary supplement products. Introduction of new
products has in the past not only brought new consumers into the market but also
fueled the purchase of other existing botanicals. The large healthcare and
consumer products companies are currently tapping into the commonly known
commodity botanical products, primarily of European origin. Once growth of these
products is maximized, novel proprietary products will be needed, and we believe
we are uniquely positioned to meet this need in certain market areas.

      We plan to partner with mass market companies in order to expand the
advertising and promotion of our botanical dietary supplement products. Such a
partnership would combine the benefits of our new products with the partner's
ability to generate large advertising and public relations campaigns for our new
product lines, similar to those created for existing consumer product lines. In
addition, we could pursue a licensing arrangement, such as that completed
between PharmaPrint, Inc. and American Home Products, in which the Shaman name
could be co-branded with a product or product line with a partner.

      Multi-Level

      Multi-level marketing, or "MLM," is a system of network marketing
comprised of two components: one-on-one selling and yearly sales conventions.
Distributors, usually individuals looking for a home-based business or the
opportunity to supplement their regular income, sell products to friends and
relatives. Distributors are incentivized to sign-up their friends as
distributors, and they receive in return an incentive for all the sales in their
network. Hence, the impact is that of an ever-growing customer base that is
somewhat captive and more predisposed to purchase than the broad consumer
public. In addition, this type of selling makes the emotional impact of product
stories very important, as distributors need to believe in the products they are
selling to friends.

      The primary form of promotion in the MLM channel, beyond one-on-one
selling, is the yearly sales convention. Each year, all distributors are brought
together for a multi-million dollar sales convention. On-stage presentations are
given on four to five key new products, or a product line, being launched in the
coming year. The history of the products, testimonials and their uses are
discussed. Then, distributors are sent back to their homes for another year of
selling. During the year, incentives may be given for reaching certain sales
quotas on a particular product or product line.

      Dietary supplements have been a mainstay of the MLM industry. However,
botanicals are a newer player on the scene. Some multi-level firms such as AmWay
Corporation, with its NutriLite line, and Nu Skin Enterprises, Inc. have
embraced the commonly used commodity botanicals. However, it is new products
that fuel the growth in MLM.

      Our botanical products lend themselves to this market for several reasons.
We have truly novel products--the lifeblood of this distribution channel.
Further, the origins of our products are unique and lend themselves to the type
of interesting and emotionally compelling selling stories required for
peer-to-peer selling. These would make for entertaining sales convention
presentations, featuring famous ethnobotanists and the rainforest. Additionally,
our reciprocity and conservation policies provide interesting content for
responsible and compelling story-based selling.

      Internet


      We believe there will be interest from potential Internet partners, both
in the natural products and broad drugstore categories, to work with us to
introduce our novel products on their sites. These novel products provide a
reason to draw traffic to these sites. For drugstore sites offering
pharmaceuticals, a product like SB-300 which addresses the side effect of
diarrhea, which appears as a side effect in the labeling of over 80% of
pharmaceuticals, provides a natural link between these products causing the
problem and, SB-300, a potential solution. Finally, the Internet offers an
opportunity to supply DSHEA-allowed distribution of third-party literature and
product information at the click of a mouse online. This is much more accessible
than providing hard copy literature in the traditional retail environment.



Competition

      Competition in the botanical dietary supplement market differs by channel
of distribution. Historically, competition within the health food channel was
fragmented and made up of over 200 small, mostly privately held companies. More
recently, several large consumer healthcare companies have opened up the
mass-market channel, including American Home Products with its Centrum(R) Herbal
brand, Bayer's introduction of botanical ingredients in their One-A-Day(R) line,
and Warner-Lambert's introduction of their Quanterra(R) brand. Overall, the
entrance of these companies is expected to broaden consumer acceptance of


                                       36
<PAGE>

botanical products and grow the total botanical dietary supplement market, with
the mass market becoming the largest, fastest-growing distribution channel. In
order to enter this key channel, we intend to partner with a company with direct
to consumer promotional capabilities and extensive experience in this market. We
believe that a partner in this channel will value the quality and scientific
rigor behind our products.

      In the multi-level marketing channel, key players include Shaklee
Corporation, Nu Skin Enterprises, Inc., USANA, Inc. and Rexall Showcase
International. Again, we intend to partner with a top-tier company in this
channel. We believe that partners in this channel will appreciate the novel
products we have to offer and the compelling stories of their rainforest and
traditional use origins.

      There is currently no established leader in marketing dietary supplements
through the Internet, although several Internet sites do exist, including
AllHerb.com, Mothernature.com, and Greentree.com. The emerging "drugstore "
sites such as Drugstore.com and PlanetRx.com also carry some dietary
supplements. We intend to start our own website within this distribution
channel, with the unique attraction of our own, novel products available on the
site, particularly targeting the HIV/AIDS Community. We have reserved the
Internet domain name "ShamanBotanicals.com." We do not expect to compete
head-to-head with the existing Internet sites, where there has been little
differentiation between sites with respect to product offerings. Rather,
ShamanBotanicals.com will focus first on the needs of the HIV/AIDS Community,
including information and nutritional products particularly important for people
with diarrhea and other associated problems. The design of our website will be
integral to the launch and sale of our first product, SB-300, for diarrhea in
people with HIV/AIDS via the Internet distribution channel. We are also
evaluating partnerships in this distribution channel for the commercialization
of SB-300 for the traveler's diarrhea market.

Government Regulation

      The term "botanical dietary supplement" is defined by the 1994 Dietary
Supplement Health and Education Act as "an herb or other botanical or a
concentrate, constituent, extract or combination of any botanical that is
intended for ingestion as a tablet, capsule, or in liquid form and is not
represented for use as a conventional food or as a sole item of a meal or the
diet and is labeled as a dietary supplement." The 1994 Dietary Supplement Health
and Education Act specifically outlines how botanical products are to be
regulated and treated. Some commonly known commodity botanical dietary
supplement products include ginseng, gingko biloba, St. John's wort, and
echinacea. This statutory definition also differentiates botanical dietary
supplements, vitamins and minerals from conventional foods or food additives.
Under the law, botanicals may be sold as dietary supplements with claims as to
their effect on the structure or function of the human body, providing the
seller has adequate documentation for the claims. Botanical dietary supplements
are regulated by the FDA. However, some botanical dietary supplement products
require no review or approval to enter the market, while some new products may
require the submission of basic safety data prior to marketing. As a result, the
FDA regulatory process in the botanical dietary supplement industry is much less
rigorous than in the pharmaceutical industry, allowing for much faster market
introduction.

      One of the unique provisions of DSHEA is the distinction between new
dietary ingredients and old dietary ingredients, which had a history of being
marketed in the United States prior to DSHEA. Old dietary ingredients have been
"grand-fathered" under the law, allowing them to be commercialized without
further FDA review. Our pipeline includes more than 400 botanical candidates
that are old dietary ingredients, including several near-term product
candidates, and numerous new dietary ingredients candidates.

Pharmaceuticals

Background

      Pharmaceutical companies continually search for innovative products
available for in-license to enhance their existing product portfolios. Products
that have an entirely different approach or means of accomplishing the desired
therapeutic effect than products currently available are particularly in demand.
In addition, companies are looking to develop or in-license products that may be
more effective and/or less costly than those currently available, or those that
could offer an alternative to other, more invasive forms of medical treatment
and address the self-medication and quality of life issues of the current aging
consumer population.

Strategy

      Until recently, we were primarily focused on discovering and developing
novel pharmaceutical products for major human diseases by isolating and
optimizing active compounds found in tropical plants with a history of medicinal
use. We have conducted human clinical trials with our three lead product
candidates -- SP-303/Provir (Phase III/II), nikkomycin Z (Phase I) and SP-134101

                                       37
<PAGE>

(Phase I) -- targeting five indications. Due to unforeseen delays and costs
necessary to complete additional trials for our lead compound, SP-303/Provir for
the treatment of diarrhea in people with AIDS, we have chosen to discontinue all
pharmaceutical development, manufacturing and marketing activities. We now
intend to out-license worldwide marketing rights to our pharmaceutical assets.

Product Discovery and Development Process

      In our efforts to develop pharmaceutical products we previously focused on
drugs extracted from plants with a long history of medicinal use. Through this
process, we successfully identified and developed a number of pharmaceutical
candidates, particularly through the preclinical and early clinical stages.
These efforts have produced a portfolio of product candidates for out-license.

Product Candidates

      We conducted human clinical trials with our three leading product
candidates -- SP-303/Provir (Phase III/II), nikkomycin Z (Phase I), and
SP-134101 (Phase I) -- targeting five indications. We have discontinued all
pharmaceutical development, manufacturing and marketing activities and plan to
out-license all of the pharmaceutical applications of our technology.

      The following table describes the major therapeutic areas in which we have
had active product development and research. Efforts are being made to
out-license all of these pharmaceutical products:

<TABLE>
<CAPTION>

Product         Indication          Status                    Commercial Rights
- -------         ----------          ------                    -----------------
<S>             <C>                 <C>                       <C>
Provir          AIDS-associated     Completed Phase III       Shaman
                 diarrhea           study in Q4, 1998.
                                    Completed a Phase II
                                    efficacy study in Q4, 1997

Provir          Watery diarrhea     Completed two Phase II    Shaman
                                    efficacy trials in Q3,
                                    1998. Completed
                                    initial Phase II
                                    efficacy studies in
                                    1996 & 1997

Provir          Pediatric           Formulation to be         Shaman
                 diarrhea           developed

Nikkomycin Z    Endemic mycoses     Completed Phase I study   Shaman
                                    in Q2, 1997.

Nikkomycin Z    Azole-resistant     Initiation of clinical    Shaman
 and Azoles      Candida            program pending pre-
                                    clinical development
                                    by Pfizer

SP-134101       Type II Diabetes    Completed Phase I study   Shaman
                                    in Q1, 1998

Oral            Type II Diabetes    Preclinical,              Ono; Lipha/Merck;
 antihyperglycemic                  29 compounds              and Shaman. Shaman
 compounds                                                    receives royalties
                                                              on sales outside
                                                              the U.S. and
                                                              profit sharing in
                                                              the U.S.

</TABLE>

Sales and Marketing

      We intend to out-license worldwide marketing rights to our
pharmaceutical assets.  See "Risk Factors--Dependence on Collaborative
Relationships."

Customers and Partners

      We continue to pursue discussions for the out-licensing of our
pharmaceutical assets.

      In September 1996, we entered into a five-year collaborative agreement
with Lipha/Merck to develop jointly our antihyperglycemic drugs. We are
currently in negotiations with Lipha/Merck for the discontinuation of this

                                       38
<PAGE>

research agreement. Lipha/Merck will make no further research payments. It is
not clear whether there would be any continuation of payment for milestone
payments or royalties, for the compounds that have already been discovered if
any of these product candidates continue into development and clinical trials,
or commercialization, based on Lipha/Merck's efforts. We are in discussions with
Lipha/Merck regarding the dissolution of this relationship.

      In May 1995, we entered into a collaborative agreement with Ono
Pharmaceutical Co. Ltd. providing for, among other things, three years of
funding for the research and development of compounds for the treatment of Type
II diabetes. Although the on-going research funding period under such agreement
has expired, Ono continues to have contractual obligations to us for the
potential payment of milestones and royalties. There can be no assurance that
such milestones will be attained or that we will receive any future milestone
payments or royalties from Ono.

Competition

      The out-licensing of pharmaceuticals is a competitive enterprise. Although
many companies consider licensing opportunities, they often investigate multiple
opportunities before settling on a select few. While Shaman is subject to this
competition, we have had significant interest in our products based upon their
novelty, safety, efficacy, and advanced stages of development. We are actively
seeking to out-license our products and we have multiple on-going discussions.
To date, these discussions have not resulted in any out-licensing agreements.
See "Risk Factors Dependence on Collaborative Relationships."

Patents and Proprietary Rights

      Proprietary protection for our product candidates, processes and know-how
is important to our business. Our policy is to file patent applications to
protect technology, inventions and improvements that are considered commercially
important to the development of our business. We also rely upon trade secrets,
know-how and continuing technological innovation to develop and maintain our
competitive position. We aggressively prosecute and defend our patents and
proprietary technology.

      We have 20 U.S. patents issued to date. In addition, we currently have 12
U.S. patent applications pending with the U.S. Patent and Trademark Office and
multiple applications filed under the Patent Cooperation Treaty. We do not know
whether any of these applications will result in the issuance of any patents or,
if any patents are issued, whether any issued patent will provide significant
proprietary protection or will be circumvented or invalidated.

      We have been issued a U.S. patent related to our specific proanthocyanidin
polymer compositions designated SP-303/Provir. Specifically, the patent contains
composition of matter claims related to SP-303/Provir contained in our
SP-303/Provir product. We have also filed foreign applications corresponding to
our issued U.S. patents relating to our proanthocyanidin polymer composition. We
have been granted patents in Australia, Mexico and New Zealand and have patent
applications pending in Canada, Europe, Japan, the Republic of Korea and
Singapore.

      We have also filed a U.S. patent application directed to new formulations
and methods of using our specific proanthocyanidin polymer composition for
treatment of watery diarrhea. These formulations are contained in our
SP-303/Provir product.

      We have 10 issued U.S. patents relating to compositions and methods for
treating Type II diabetes, as well as reducing hyperglycemia associated with
other etiologies. We also have eight additional U.S. patent applications pending
that relate to compositions and methods for treating Type II diabetes, as well
as reducing hyperglycemia associated with other etiologies. We have filed 11
foreign applications, i.e., international applications under the Patent
Cooperation Treaty designating a number of foreign countries, as well as
applications in Taiwan, corresponding to eleven U.S. applications and plan to
file additional corresponding foreign applications within the relevant
convention periods.

      We also have one issued U.S. patent and corresponding international patent
applications in a number of foreign countries relating to methods for
administering and sustained release formulations for anti-fungal agents like
nikkomycin Z. The methods and compositions are useful for treatment of fungal
infections, particularly candidiasis, the most frequently encountered
life-threatening mycoses. We have licensed several patents from Bayer AG
relating to the use of nikkomycin Z and the composition and use of nikkomycin Z
in combination with other antifungal compounds for the development of antifungal
agents.

      There can be no assurance that our pending patent applications will result
in patents being issued or that, if issued, patents will afford protection
against competitors with similar technology; nor can there be any assurance that
others will not obtain patents that we would need to license or circumvent. See
"Risk Factors--Uncertainty Regarding Patents and Proprietary Rights; Current
Legal Proceedings Regarding Patents and Proprietary Rights."


                                       39
<PAGE>

Community Commitment

The Healing Forest Conservancy

      In January 1990, we formed The Healing Forest Conservancy, a California
not-for-profit public benefit corporation which is dedicated to maintaining
global biocultural diversity. The Conservancy focuses on conserving plants that
have been used traditionally for medicinal and health purposes and conserving
the knowledge of cultures that utilize them. We have donated 667 shares of our
common stock to the Conservancy's endowment fund. We also plan to donate
additional funds when we have achieved profits from product sales, if any, to
provide benefits to indigenous peoples in the countries where our source plants
are obtained.

The Shaman HIV Investment Trust

      In 1998, we made a commitment to create the Shaman HIV Investment Trust,
which provides funding for charitable causes within the HIV/AIDS Community,
including services, education and research. We have committed to the Trust a
royalty on the first five years of U.S. product net sales of SB-300 which are
sold in the HIV/AIDS market. The Trust will be administered independently by a
committee of HIV/AIDS Community leaders.

Employees


      In February 1999, we ceased operations in our pharmaceuticals business and
downsized by approximately 60 employees, or 65% of our workforce. As of April
30, 1999, we had 26 employees. The remaining employees are expected to remain at
Shaman and will primarily focus their activities on the botanicals business.


Legal Proceedings

      We have entered into arbitration against Dr. Michael Tempesta with respect
to a February 1990 license agreement. With the exception of the patent
opposition proceeding in Europe and the arbitration against Dr. Tempesta, we are
not a party to any other material legal proceedings. See "Risk Factors--The
failure to protect our intellectual property rights could adversely impact our
business."


                                       40
<PAGE>

                               MANAGEMENT


Executive Officers and Directors

     The following table sets forth certain information with respect to the
executive officers, directors and key employees of Shaman as of May 3, 1999:

<TABLE>

<CAPTION>
         Name                 Age                                  Position
- -------------------------     ---    --------------------------------------------------------------------------------
<S>                           <C>     <C>
Lisa A. Conte............     40     Director, President, Chief Executive Officer, and Chief Financial Officer
Steven R. King, Ph.D.....     41     Senior Vice President, Ethnobotany and Conservation
Gerald M. Reaven, M.D....     70     Senior Vice President, Medical and Clinical Advisor
Thomas Carlson, M.D......     42     Vice President, Medical Ethnobotany
John W.S. Chow, Ph.D.....     47     Vice President, Technical Operations
J.D. Haldeman............     34     Vice President, Commercial Development
Tom White................     40     Senior Vice President, Commercial Strategy and Chief Sales and Marketing Officer
G. Kirk Raab (1).........     63     Chairman of the Board
Loren D. Israelsen.......     43     Director and Interim Chief Executive Officer of ShamanBotanicals.com
Adrian D.P. Bellamy (2)..     57     Director
Jeffrey Berg.............     51     Director
Herbert H. McDade, Jr....     72     Director
M. David Titus (1).......     41     Director


</TABLE>
- --------------------------
 (1)   Member of the Audit Committee
 (2)   Member of the Compensation Committee

     Lisa A. Conte founded  Shaman in May 1989 and currently  serves as Shaman's
President, Chief Executive Officer, Chief Financial Officer, and Director. From
1987 to 1989, Ms. Conte was Vice President at Technology Funding, Inc., a
venture capital firm, where she was responsible for the analysis and management
of healthcare industry investments. From 1985 to 1987, she conducted risk and
strategy audits for venture capital portfolio companies at Strategic Decisions
Group, a management consulting firm. Ms. Conte received an A.B. in Biochemistry
from Dartmouth College, an M.S. in Physiology/Pharmacology from the University
of California, San Diego and an M.B.A. from The Amos Tuck School, Dartmouth
College.

     Steven R. King,  Ph.D.  joined Shaman in March 1990. He currently serves as
Senior Vice President, Ethnobotany and Conservation and is responsible for
coordinating our Scientific Strategy Team. From 1989 to 1990, Dr. King was the
chief botanist for Latin America at Arlington, Virginia's Nature Conservancy. He
worked in 1988 as Research Associate for the Committee on Managing Global
Genetic Resources at the National Academy of Sciences, and was a Doctoral Fellow
from 1983 to 1988 at The New York Botanical Garden's Institute of Economic
Botany. Dr. King received a B.A. in Human Ecology from the College of the
Atlantic and M.S. and Ph.D. degrees in Biology from City University of New York.

     Gerald M. Reaven,  M.D.  joined Shaman as a consultant in February 1995 and
became an employee in July 1995. He currently serves as Senior Vice President,
Medical and Clinical Advisor. Dr. Reaven came to Shaman from the Stanford
University School of Medicine where he served as a faculty member since 1960 and
a Professor of Medicine since 1970. Over the last 20 years, Dr. Reaven served as
head of the Division of Endocrinology and Metabolic Diseases, Division of
Gerontology and director of the General Clinical Research Center. Dr. Reaven
also served as head of the Division of Endocrinology, Gerontology and Metabolism
at Stanford University School of Medicine, and Director of the Geriatric
Research, Education and Clinical Center, at the Palo Alto Veterans Affairs
Medical Center. Dr. Reaven received his A.B., B.S. and M.D. from the University
of Chicago.

     Thomas Carlson,  M.D. joined Shaman in October 1992. He currently serves as
Vice President, Medical Ethnobotany and is responsible for developing
ethnobotancial field research and coordinating clinical studies. Dr. Carlson has
conducted research with traditional healers in over 40 different ethnolinguistic
groups in 15 different tropical countries. Prior to joining Shaman, from 1990 to
1992, Dr. Carlson practiced General Pediatrics at Kaiser Permanente in Santa
Clara, California and worked at the Aravind Childrens and Eye Hospitals in
Madurai, India on child malnutrition and blindness. From 1987 to 1990, Dr.
Carlson completed his Internship and Residence in Pediatrics at Stanford
University Medical Center. Dr. Carlson received his M.D. from Michigan State
University and a B.S. and M.S. in Botany from the University of Michigan.


                                       41
<PAGE>

     John  Chow  joined  Shaman in April  1998 as Vice  President  of  Technical
Operations. Prior to joining Shaman, from December 1997 to April 1998, Dr. Chow
served as Director, Product and Technology Evaluation at Bristol-Myers Squibb
Company, where he performed technical due diligence toward the acquisition and
licensing of various dosage forms and technologies and reviewed and approved new
product specifications. Prior to holding this position, from July 1980 to
December 1997, Dr. Chow held other positions, also with Bristol-Myers Squibb

Company, where he was responsible for developing strategies for manufacturing
consolidation, facilitating technology transfers of new and existing products,
and directing technical operations of an international plant. Dr. Chow received
a B.S. in Pharmacy from Washington State University, a Ph.D. in Pharmaceutical
Chemistry from Ohio State University and an M.B.A. in Pharmaceutical/Chemical
Studies from Fairleigh Dickinson University.

     J.D.  Haldeman  joined  Shaman in July 1997 as Vice  President,  Commercial
Development. Prior to joining Shaman, from April 1988 to June 1997, Ms. Haldeman
served in various positions at Warner-Lambert/Parke-Davis Pharmaceuticals most
recently as Senior Director, Cardiovascular Marketing from October 1995 to June
1997. Prior to that, she served as Director, Customer Marketing -- West Business
Unit; Product Manager, Epilepsy Team; Associate Product Manager, Global
Cardiovascular Product Planning; and Sales Specialist for
Warner-Lambert/Parke-Davis Pharmaceuticals. Ms. Haldeman received her B.A. from
Brigham Young University and her Masters of Management from the J.L. Kellogg
Graduate School of Management, Northwestern University.


     Tom White joined  Shaman in May 1999 as Senior Vice  President,  Commercial
Strategy, and Chief Sales and Marketing Officer. Prior to joining Shaman, from
April 1998 to May 1999, Mr. White served as Executive Vice President, General
Manager Functional Food & Beverages at Weider Nutrition International. Prior to
that, from June 1995 to March 1998, he was a Principal in the firm of White,
Smith-White & Partners, a consumer products consulting firm, and from August
1993 to May 1995, he served as Director of Marketing for Pete's Brewing Company.
Mr. White received his B.A. in Journalism from the University of Missouri, and
his M.S. in Advertising from Northwestern University.


     G. Kirk Raab became a director in January 1992 and Chairman of the Board in
September 1995. Mr. Raab was President, Chief Executive Officer and director of
Genentech, Inc. from February 1990 to July 1995 and President, Chief Operating
Officer and director from February 1985 to January 1990. Before joining
Genentech, Mr. Raab was associated with Abbott Laboratories, serving as
President, Chief Operating Officer and director. Mr. Raab is also Chairman of
the Board of Connectics, Inc., Oxford GlycoSciences (UK) Ltd. and LXR
Biotechnology, Inc., and is a director of Bridge Medical, Inc., Accumetrics,
Inc. and Applied Imaging Corporation. Mr. Raab holds a B.A. in Political Science
from Colgate University.

     Loren D.  Israelsen  became a director in April 1999 and the Interim  Chief
Executive Officer of our ShamanBotanicals.com division in January 1999. Mr.
Israelsen has been President of LDI Group, a consulting firm specializing in
dietary supplement and phytomedicine issues, since 1997. From 1990 to 1997, Mr.
Israelsen practiced law at a private firm. From 1981 to 1990, Mr. Israelsen
served in various positions at Murdock International Corporation, including
President from 1989 to 1990, Vice President of Strategic Development from 1986
to 1989 and General Counsel from 1981 to 1986. While acting as Vice President of
Strategic Development, he identified and negotiated several license agreements
to bring the world's leading phytomedicines, including Ginkgo biloba extract,
milk thistle extract, echinacea, evening primrose oil, and saw palmetto extract,
to the United States. Mr. Israelsen has served as General Counsel/Vice President
to the American Herbal Products Association, Co-counsel to the European American
Phytomedicine Coalition, industry liaison to FDA's expert advisory committee on
Ephedra and advisor to the Natural Products Quality Assurance Alliance, the
Office of Technology Assessment and the Office of Dietary Supplements. Since
1992, he has served as Executive Director of the Utah Natural Products Alliance,
which was instrumental in developing and passing the Dietary Supplement Health
and Education Act of 1994.

     Adrian D.P.  Bellamy  became a director in October 1997.  Since April 1995,
Mr. Bellamy has served as Chairman and a director of each of Airport Group
International Holdings, L.L.C. and Gucci Group N.V. From September 1983 to April
1995, Mr. Bellamy served as Chairman of the Board of Directors and Chief
Executive Officer of DFS Group Limited, a specialty retailer. He received a B.A.
in Communications and an M.B.A. from the University of South Africa. Mr. Bellamy
is a director of The Body Shop, Inc., The Body Shop International PLC, The Gap,
Inc., Paragon Trade Brands, Inc. and Williams-Sonoma, Inc.

     Jeffrey Berg became a director in June 1998. Mr. Berg has been the Chairman
and Chief Executive Officer of International Creative Management, Inc. since
1985. Mr. Berg, one of the leading agents in the entertainment industry, has
been in the entertainment industry for over 25 years. Mr. Berg received a B.A.
from the University of California at Berkeley and a Master of Liberal Arts from
the University of Southern California. He served as Co-Chair of the California
Information Technology Council and is a director of each of Oracle Corporation
and Excite, Inc.


                                       42
<PAGE>

     Herbert H. McDade,  Jr. became a director in October 1991. He has served as
Chairman of the Board and Chief Executive Officer of Chemex, Pharmaceuticals,
Inc. since February 1989 and as Chief Executive Officer from February 1989
through January 1996, when Chemex Pharmaceuticals merged with Access
Pharmaceutical Corporation and the combined entity changed its name to Access
Pharmaceutical Corporation Inc. From October 1986 to January 1988, Mr. McDade
was Chairman, President and Chief Executive Officer of Armour Pharmaceuticals,
Inc., after previously serving as President, International Health Care Division
of the Revlon Health Care Group. Mr. McDade holds a B.S. in Biology from the
University of Notre Dame and a B.P.H. in Theology and Philosophy from Laval
University. He is Chairman of the Board of Access Pharmaceutical Corporation and
a director of Cytrx, Inc., Discovery Ltd. and several privately held companies.

     Mr. David Titus  became a director in April 1990.  Mr. Titus is currently a
General Partner of Windward Ventures Management, L.P., a venture capital firm,
which he founded in November 1997. Prior to founding Windward Ventures
Management, L.P., Mr. Titus was Managing Director of Windward Ventures, a
venture capital consulting and investment firm, which he founded in 1993. From
May 1986 to December 1992, he served in various capacities at Technology
Funding, Inc., a venture capital firm, including Group Vice President,
Technology Funding, Inc., and General Partner of Technology Funding Limited.
Prior to joining Technology Funding, Inc. in May 1986, Mr. Titus was a founder
and Senior Vice President of the Technology Division of Silicon Valley Bank. Mr.
Titus earned a B.A. in Economics from the University of California, Santa
Barbara. He is a director of several privately held companies.

Number of Directors; Relationships

      Our bylaws authorize the board to fix the number of directors serving on
the board, provided that such number shall not be less than five nor more than
nine. The number of directors is currently fixed at seven. All directors hold
office until the second annual meeting of stockholders following the annual
meeting of stockholders at which such director was elected, or until their
successors have been duly elected and qualified.

      There are no family relationships among our executive officers or
directors.

Committees of the Board of Directors

      Shaman's board of directors has an audit committee which is primarily
responsible for annually recommending independent auditors for appointment by
the board, for reviewing the services performed by our independent auditors and
reviewing reports submitted by the independent auditors. The audit committee
includes two directors, Messrs. Titus and Raab.

      The board also has a compensation committee, which is comprised of Messrs.
McDade and Bellamy. The compensation committee reviews and approves our general
compensation policies and practices, sets compensation levels for our executive
officers and administers our 1992 Stock Option Plan and other employee benefits
programs.

Director Compensation

      Each non-employee director receives an annual retainer fee of $10,000,
provided the non-employee director attends at least 75% of the board meetings.
In addition, non-employee directors are reimbursed for reasonable expenses
incurred in connection with their attendance at such meetings.

      The information given below is for historical purposes because each member
of the board of directors has agreed to surrender their outstanding options to
purchase shares of our common stock.

      Shaman's non-employee directors receive stock options under our
1992 Stock Option Plan.  See "1992 Stock Option Plan."

      On June 30, 1998, Mr. Berg received an option to purchase 1,000 shares of
common stock in connection with his initial appointment to the board pursuant to
the automatic grant provision of the 1992 Stock Option Plan. The option has an
exercise price of $67.50 per share, the fair market value per share of the
common stock on the grant date. Mr. Berg has agreed to surrender these options.

      On May 15, 1998, Messrs. McDade, Raab, Titus and Bellamy each received an
option grant for 375 shares of common stock under the automatic option grant
provisions of the 1992 Stock Option Plan. These options have an exercise price
per share of $98.75, the fair market value per share of common stock on that
date. Each of these directors has agreed to surrender these options.


                                       43
<PAGE>

      On October 20, 1998, the compensation committee, as administrator of the
1992 Stock Option Plan, implemented an option cancellation/regrant program for
certain key consultants and non-employee directors (other than the members of
the compensation committee) holding options under the plan. Pursuant to this
program, each eligible non-employee director was given the opportunity to
surrender his outstanding options under the 1992 Stock Option Plan with exercise
prices in excess of $28.75 per share in return for a new option grant for the
same number of shares but with an exercise price of $28.75 per share, the
closing selling price per share of common stock as reported on the Nasdaq
National Market on the October 20, 1998 grant date of the new option. To the
extent the higher-priced option was exercisable for any option shares on the
October 20, 1998 cancellation date, the new option granted in replacement of
that option would become exercisable for those shares in a series of 12
successive equal monthly installments upon the optionee's completion of each
month of service over the one-year period measured from the October 20, 1998
grant date. The option would become exercisable for the remaining option shares
in one or more installments over the optionee's period of continued service,
with each such installment to vest on the same vesting date in effect for that
installment under the cancelled higher-priced option. The following non-employee
directors participated in the October 20, 1998 cancellation/regrant program with
respect to the indicated number of option shares: Mr. Raab, 17,214 shares with a
weighted average exercise price of $110.56 per share; Mr. Titus, 2,914 shares
with a weighted average exercise price of $128.48 per share; Mr. Berg, 1,000
shares with a weighted average exercise price of $67.50 per share. Each of these
directors has agreed to surrender such options.

      On May 1, 1997, the board of directors approved a consulting arrangement
with Mr. Titus, one of its non-employee directors pursuant to which he is to
serve as a consultant to Shaman on financing matters and financial operations.
Under this arrangement, Mr. Titus was paid consulting fees in the amount of
$36,000 for the 1998 fiscal year. This arrangement expired in June 1998. As part
of his initial consulting arrangement, Mr. Titus was granted an option to
purchase up to 700 shares of common stock under the discretionary option grant
program in effect under the 1992 Stock Option Plan. Such option has an exercise
price of $107.50 per share, the fair market value of our common stock on the May
22, 1997 grant date of that option and is exercisable in full at any time prior
to May 22, 2007. This option was surrendered on October 20, 1998 under the
option cancellation/regrant program, in return for a new option grant for the
same number of shares but with an exercise price of $28.75 per share. The option
would have become exercisable in a series of 12 successive equal monthly
installments over the one-year period measured from the October 20, 1998 grant
date, however, Mr. Titus has agreed to surrender this option.

      In August 1995, we entered into a consulting arrangement with Mr. G. Kirk
Raab, Chairman of the Board. As consideration for special consulting services
Mr. Raab performed under the consulting arrangement, Mr. Raab was paid an annual
consulting fee of $100,000. In addition, he was granted an option for 10,000
shares of common stock on August 21, 1995 with an exercise price per share of
$110.00, the fair market value per share of common stock on that date. The
option was granted under the discretionary option grant provision of the 1992
Stock Option Plan, and the option would have become exercisable in a series of
48 successive equal monthly installments over the four-year period measured from
the August 21, 1995 grant date, provided Mr. Raab continued to render services
to us pursuant to his consulting arrangement. This option was surrendered on
October 20, 1998 under the option cancellation/regrant program, in return for a
new option grant for the same number of shares but with an exercise price of
$28.75 per share. Mr. Raab has agreed to surrender this replacement option. In
addition, in connection with his services as a director and as Chairman of the
Board, Mr. Raab received an annual retainer fee of $60,000, payable after each
annual meeting of stockholders so long as Mr. Raab continued to render services
to us as Chairman of the Board. We paid a total of $66,667 of the consulting
fees in cash and on November 7, 1998, issued 6,783 shares of common stock in
payment of his consulting services for the 1998 fiscal year. Shaman and Mr. Raab
have agreed to terminate the compensation component of his consulting
arrangement and no further payments are to be due under this arrangement. Mr.
Raab still serves as Chairman of the Board.

      In January 1999, we entered into a consulting agreement with Mr. Loren D.
Israelsen, a director and officer, pursuant to which he serves as interim Chief
Executive Officer of our ShamanBotanicals.com division. Under this agreement,
Mr. Israelsen was paid a total of $30,000 for his services in January and
February 1999. In addition, upon further funding of Shaman, Mr. Israelsen is to
be paid $10,000 in deferred consulting expenses and an additional $150,000
project retainer to help close a corporate deal for the ShamanBotanicals.com
division. Such retainer will be paid in three installments during the third
quarter of 1999. Mr. Israelsen will also receive a success payment for each
corporate partnership as a percentage of the up front fee received from such
partner, which fee varies from three to five percent depending upon the timing
of closing such partnership.

Compensation Committee Interlocks and Insider Participation

      During the 1998 fiscal year, Herbert H. McDade and Adrian D.P. Bellamy
served as members of the compensation committee of the board of directors. No
member of the compensation committee was, at any time during the 1998 fiscal
year or at any earlier time, an officer or employee of Shaman. No executive
officer of Shaman serves as a member of the board of directors or compensation


                                       44
<PAGE>

committee of any entity which has one or more executive officers serving as a
member of the company's board of directors or compensation committee.

Executive Compensation

      The following table sets forth the compensation earned, for services
rendered in all capacities to us, for each of the last three fiscal years by (i)
Shaman's Chief Executive Officer and (ii) the four other highest paid executive
officers serving as such at the end of the 1998 fiscal year whose salary and
bonus for that fiscal year was in excess of $100,000. The individuals named in
the table will be referred to in this prospectus as the Named Officers. No other
executive officer who would otherwise have been included in such table on the
basis of fiscal year 1998 salary and bonus resigned or terminated employment
during the year.

<TABLE>
                                             SUMMARY COMPENSATION TABLE
<CAPTION>
                                                                                        Long-Term
                                              Annual Compensation                      Compensation
                         ------------------------------------------------------------- ------------
                                                                                          Awards
                                                                                        ---------
                         --------------------------------------------------------------------------
                                                                               Other       Securities
                                                                               Annual      Underlying     All Other
                                                  Salary                       Compen-       Options/      Compen-
  Name and Pricipal Position          Year        ($)(1)       Bonus ($)       sation($)     SARS (#)     sation($)
- -------------------------------       ----      ----------     ---------       ----------    ---------    ---------
<S>                                  <C>         <C>           <C>             <C>           <C>          <C>

Lisa A. Conte, President,             1998      311,537(2)       3,000(3)           --       102,250(4)       --
  Chief Executive Officer             1997      312,901(5)      91,689(6)           --        14,750(4)       --
  and Chief Financial Officer         1996      286,190(7)      53,000(8)           --         5,250(4)       --

Gerald M.  Reaven, M.D.               1998      243,015          3,000(3)           --        10,750          --
  Senior Vice President,              1997      239,114         25,000(9)           --            --          --
  Medical and Clinical Advisor        1996      227,878          3,000              --           250          --

Atul S. Khandwala, Ph.D. (10)         1998      177,474          3,000(3)      125,531(11)     2,000      66,356(12)
  Former Senior Vice President,       1997      226,031         20,000(9)           --            --      82,217(13)
  Development and Chief               1996      187,563          3,000          51,200(14)     6,250     106,399(15)
  Regulatory Officer

Steven R. King, Ph.D.                 1998      179,329          3,000(3)           --         7,440          --
  Senior Vice President,              1997      176,202         40,000(9)           --            --          --
  Ethnobotany and Conservation        1996      171,822          3,000              --         2,750          --

James E. Pennington, M.D. (16)        1998      257,544          3,000(3)           --         6,250          --
  Former Senior Vice President,       1997       58,490         70,000(17)          --         6,250          --
  Clinical Research and               1996           --             --              --            --          --
  Chief Medical Officer
  Officer

Laurie Peltier(18),                   1998      152,654          3,000(3)           --         3,250      25,000(19)
  Vice President, Project             1997       87,674         20,000(20)          --         2,750      19,223(21)
  Coordination                        1996           --             --              --            --          --

</TABLE>

- ------------------
(1)   Includes amounts deferred under our Internal Revenue Code Section 401(k)
      Plan and Section 125 Plan.
(2)   Includes $59,573 and $13,431 attributable to child care costs and family
      travel, respectively.
(3)   Represents  all  employees  bonus paid in 1998 for  achievement  of
      milestones in 1997.
(4)   Ms.  Conte  has agreed  to surrender  all of her  currently  held options.
(5)   Includes $61,214 and $27,287 attributable to child care costs and family
      travel, respectively.


                                       45
<PAGE>

(6)   Includes  $75,000 paid in 1998 for  achievement  of  milestones  in 1997.
(7)   Includes $49,646 and $16,858 attributable to child care costs and family
      travel, respectively.
(8)   Includes  $50,000 paid in 1997 for  achievement  of  milestones  in 1996.
(9)   Represents  bonus paid in 1998 for  achievement  of  milestones  in 1997.
(10)  We accepted the resignation of Dr. Khandwala  effective  October 2, 1998.
(11)  Represents amount paid in common stock for services rendered.
(12)  Includes $3,000 received as a housing  subsidy,  $2,018 for travel
      expenses and $61,338 for indebtedness for which repayment was forgiven.
(13)  Includes $16,500 received as a housing subsidy, $1,164 for travel expenses
      and $64,553 in indebtedness for which repayment was forgiven.
(14)  Represents fees received from consulting services.
(15)  Includes  $13,445  received  as a  housing  subsidy,  $23,746  for
      moving and relocation expenses, $1,562 for travel expenses and $67,646 in
      indebtedness for which repayment was forgiven.
(16)  Dr.  Pennington joined us in September  1997.  In 1997, he earned $58,490,
      based on an annual  salary of  $255,000.  Dr.  Pennington was terminated
      effective February 19, 1999 due to the elimination of his position in
      connection with the our restructuring.
(17)  Includes  $60,000  sign-on  bonus and $10,000  bonus paid in 1998 for
      achievement of milestones in 1997.
(18)  Ms.  Peltier  joined us in June 1997.  In 1997,  she earned  $87,674,
      based on an annual salary of $150,000.
(19)  Represents closing costs on the sale of Ms.  Peltier's  former residence.
(20)  Includes  $10,000  sign-on bonus and $10,000 bonus paid in 1998 for
      achievement of milestones in 1997.
(21)  Represents moving and relocation expenses.

Stock Option and Stock Appreciation Rights under our 1992 Stock Option Plan

      The following table contains information concerning the grant of stock
options under our 1992 Stock Option Plan to the Named Officers during the 1998
fiscal year. Except for the limited stock appreciation right described in
footnote (2) below which formed part of the option grant made to each Named
Officer, no stock appreciation rights were granted to such Named Officers during
the 1998 fiscal year.


<TABLE>
                      OPTION/SAR GRANTS IN LAST FISCAL YEAR
<CAPTION>


                                                                     Potential Realizable Value at
                                                                  Assumed Annual Rates of  Stock Price
                   Individual Grants                                 Appreciation for Option Term (1)
- -------------------------------------------------------    ----------------------------------------------------
                                             % of Total
                             Number           Options
                             of               Granted
                             Securities          to
                             Underlying       Employees       Exercise
                             Options/SARs     in Fiscal        Price       Expiration
 Name(*)                     Granted(#)(2)       Year       ($/Share)(3)       Date          5%           10%
- ---------------------        -------------    ----------    ------------   ----------    ---------    ----------
<S>          <C>            <C>        <C>         <C>        <C>        <C>
Lisa A. Conte(4)                27,250          14.60%          25.62       09/17/08      $439,059    $1,112,663
                                75,000          40.19%          25.62       09/17/08     1,208,421     3,062,376

Gerald M. Reaven, M.D.          10,750           5.76%          25.62       09/17/08       173,207       438,941

Atul S. Khandwala, Ph.D. (5)     2,000           1.07%          28.75       10/19/08         4,211         8,535

Steven R. King, Ph.D.            7,440           3.99%          25.62       09/17/08       119,883       303,808

James Pennington, M.D. (6)       6,250           3.35%          25.62       09/17/08       100,702       255,198

Laurie Peltier                   2,750           1.47%          25.62       09/17/08        44,309       112,287
                                   500           0.27%          25.62       09/17/08         8,053        20,413

</TABLE>
- -----------------


                                       46
<PAGE>

(1)   Potential realizable value is based on assumption that the market price of
      the common stock appreciates at the annual rate shown (compounded
      annually) from the date of grant until the end of the 10-year option term.
      There can be no assurance that the actual stock price appreciation over
      the 10-year option term will be at the assumed 5% and 10% levels or at any
      other defined level. As of March 31, 1999, the exercise price of all
      options was significantly higher than the trading price of the stock on
      that date.
(2)   Each option has a maximum term of 10 years, subject to earlier termination
      in the event of the optionee's cessation of service with Shaman. Except
      for the options for 75,000 shares granted to Ms. Conte, 2,000 shares
      granted to Mr. Khandwala and 500 shares granted to Ms. Peltier, each
      option granted to the Named Officers in fiscal 1998 were part of the
      September 18,1998 cancellation/regrant program. Accordingly, to the extent
      the cancelled option for the same number of shares was exercisable for any
      of those shares on the September 18, 1998 cancellation date, the new
      option granted in replacement of that option will become exercisable for
      those shares in a series of 12 successive equal monthly installments upon
      his or her completion of each month of service over the one-year period
      measured from the September 18, 1998 grant date. The option will become
      exercisable for the remaining option shares in one or more installments
      over her period of continued service, with each such installment to vest
      on the same vesting date in effect for that installment under the
      cancelled option. The options for 75,000 shares to Ms. Conte and 500
      shares to Ms. Peltier will become exercisable for 12.5% of the option
      shares upon completion of 6 months of service measured from the grant
      date, and the balance of the option shares will become exercisable in a
      series of 42 successive equal monthly installments over the optionee's
      period of continued service thereafter. The option for 2,000 shares to Mr.
      Khandwala will become exercisable in a series of six successive equal
      monthly installments over the optionee's period of continued service
      thereafter. However, each of the options granted to the named executive
      officers will become immediately exercisable in full upon an acquisition
      of the company by merger or asset sale, unless the option is assumed by
      the successor entity. Each option includes a limited stock appreciation
      right which will result in the cancellation of that option, to the extent
      exercisable for vested shares, upon the successful completion of a hostile
      tender for securities possessing more than 50% of the combined voting
      power of our outstanding voting securities. In return for the cancelled
      option, the optionee will receive a cash distribution per cancelled option
      share equal to the excess of (i) the highest price paid per share of our
      common stock in such hostile tender offer over (ii) the exercise price
      payable per share under the cancelled option.
(3)   The exercise price may be paid in cash or in shares of common stock
      (valued at fair market value on the exercise date) or through a cashless
      exercise procedure involving a same-day sale of the purchased shares. We
      may also finance the option exercise by loaning the optionee sufficient
      funds to pay the exercise price for the purchased shares and the federal
      and state income tax liability incurred by the optionee in connection with
      such exercise. The optionee may be permitted, subject to the approval of
      the compensation committee, as administrator of the 1992 Stock Option
      Plan, to apply a portion of the shares purchased under the option (or to
      deliver existing shares of common stock) in satisfaction of such tax
      liability.
(4)   Ms. Conte has agreed to surrender all of her currently held options.
(5)   We accepted the resignation of Dr. Khandwala effective October 2, 1998.
(6)   Dr. Pennington was terminated effective February 19, 1999 due the
      elimination of his position in connection with  our restructuring.

Option Exercises and Holdings

      The following table provides information with respect to the Named
Officers concerning the exercise of options during the 1998 fiscal year and
unexercised options held as of December 31, 1998. No stock appreciation rights
were exercised during such fiscal year, and except for the limited stock
appreciation right described in footnote (2) to the Stock Option/SAR Grants
Table which forms part of each outstanding stock option, no stock appreciation
rights were outstanding at the end of that fiscal year.



                                       47
<PAGE>

<TABLE>
                                 AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                                           AND FY-END OPTION VALUES
<CAPTION>


                                            Value
                                           Realized                                 Value of Unexcercised
                                           (Market                                   In-the-Money Options
                                           price at                                   at FY-End (Market
                               Shares      exercise     No. of Securities              price of shares at
                              Acquired     date less  Underlying Unexcersied         FY-End less excercise
                                 on        exercise     Options at FY-End (#)             price) ($)(1)
         Name                 Exercise       price)  -----------------------------  ---------------------------
                                (#)         ($)(2)     Exercisable   Unexercisable  Exercisable   Unexercisable
- --------------------------   ----------   ----------  ------------   -------------  -----------   -------------
<S>          <C>     <C>    <C>         <C>           <C>          <C>
Lisa A. Conte(3)                 --           --          4,771          101,229      $130,961      $1,265,364

Gerald M. Reaven, M.D.           --           --          2,687            8,062       $33,594        $100,781

Atul S. Khandwala, Ph.D.(4)      --           --            667            1,333        $6,247         $12,493

Steven R. King, Ph.D.            --           --          2,075            5,648       $25,902         $70,598

James Pennington, M.D.(5)        --           --            781            5,469        $9,766         $68,359

Laurie Peltier                   --           --            281            2,969        $3,516         $37,106


</TABLE>

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

(1)   Based on the fair market value of our common stock on December 31, 1998 of
      $38.12 per share, the Nasdaq National Market trading price at the close of
      business that same day. As of March 31, 1999, these options had no value
      since the exercise price of all options was significantly higher than the
      trading price of the stock on that date.
(2)   Equal to the closing selling price of the purchased shares on the option
      exercise date less the exercise price paid for such shares.
(3)   Ms. Conte has agreed to surrender all of her currently held options.
(4)   We accepted the resignation of Dr. Khandwala effective October 2, 1998.
(5)   Dr. Pennington was terminated effective February 19, 1999 due to the
      elimination of his position in connection with our restructuring.

Option Repricings

      We implemented a special option cancellation/regrant program for all of
our employees, including executive officers, holding stock options with an
exercise price per share in excess of the fair market value of our common stock
on the regrant date. The cancellations/regrants were effected on September 18,
1998, and a number of outstanding options with an exercise price in excess of
$25.62 per share were surrendered for cancellation and new options for the same
aggregate number of shares were granted with an exercise price of $25.62 per
share.

      The following table sets forth information with respect to each of the
Named Officers concerning his or her participation in the option
cancellation/regrant program effected on September 18, 1998. We have not
implemented any other option cancellation/regrant programs in which our
executive officers have participated.

                                       48
<PAGE>

<TABLE>
<CAPTION>
                                   Number of       Market                                Length of
                                  Securities      Price of     Excercise                Option Term
                                   Underlying      Stock at     Price at                Remaining at
                                     Options       Time of       Time of                  Date of
                                     Repriced     Repricing     Repricing      New       Repricing
                        Repricing        or           or           or        Excercise       or
    Name                  Date       Amended(1)    Amendment    Amendment     Price       Amendment
- ------------------      ---------    ----------    ---------    ---------    ---------    ---------
<S>                     <C>          <C>           <C>          <C>          <C>          <C>
Lisa A. Conte(2)         9/18/98          500        $25.62      $ 70.00       $25.62     6.4 years
                         9/18/98        6,750         25.62        70.00        25.62     6.4 years
                         9/18/98        5,000         25.62       137.50        25.62     7.4 years
                         9/18/98          250         25.62       117.50        25.62     8.1 years
                         9/18/98       14,750         25.62       100.32        25.62     8.4 years

Gerald M.                9/18/98       10,000        $25.62      $ 72.50       $25.62     6.4 years
  Reaven, M.D.           9/18/98          500         25.62        70.00        25.62     6.4 years
                         9/18/98          250         25.62       117.50        25.62     8.1 years

Atul S. Khandwala,           ---          ---           ---          ---          ---           ---
  Ph.D.(3)

Steven R. King, Ph.D.    9/18/98        1,750        $25.62      $105.00       $25.62     6.2 years
                         9/18/98        1,250         25.62        70.00        25.62     6.4 years
                         9/18/98        1,190         25.62        70.00        25.62     6.4 years
                         9/18/98          500         25.62        70.00        25.62     6.4 years
                         9/18/98        2,500         25.62       137.50        25.62     7.4 years
                         9/18/98          250         25.62       117.50        25.62     8.1 years

James Pennington,        9/18/98        6,250        $25.62      $121.26       $25.62     9.0 years
  M.D.(4)

Laurie Peltier           9/18/98        2,000        $25.62      $118.76       $25.62     8.8 years
                         9/18/98          750         25.62       118.76        25.62     8.8 years

</TABLE>
- ----------------------

(1)   As of March 31, 1999, the exercise price of the options was significantly
      higher than the trading price of stock on that date.
(2)   Ms. Conte has agreed to surrender all of her currently held options.
(3)   We accepted the resignation of Dr. Khandwala effective October 2, 1998.
(4)   Dr. Pennington was terminated effective February 19, 1999 due to the
      elimination of his position in connection with our restructuring.

1992 Stock Option Plan

      Our 1992 Stock Option Plan was adopted by the board of directors on
December 16, 1992, and has been amended several times since its adoption. The
1992 Stock Option Plan will terminate on December 31, 2008. As of April 15,
1999, 7,000,000 shares of common stock have been authorized for issuance under
the 1992 Stock Option Plan. In addition, on February 1, 2000, the number of
shares of common stock issuable under the 1992 Stock Option Plan will
automatically increase by that number of shares which, when added to the number
of shares subject to then outstanding options under the 1992 Stock Option Plan
and the number of shares available for future option grant under the 1992 Stock
Option Plan immediately prior to such increase, will equal the lesser of (a)
25,000,000 shares or (b) twenty percent (20%) of the sum of (i) the number of
voting shares of Shaman's capital stock outstanding at that time plus (ii) the
number of shares of common stock subject to the then outstanding options under
the 1992 Stock Option Plan plus (iii) the number of shares available for future
option grant under the 1992 Stock Option Plan (after taking such increase into
account). As of April 15, 1999, approximately 27,571 shares of common stock had
been issued under the 1992 Stock Option Plan, 207,018 shares of common stock
were subject to outstanding options, and 6,765,411 shares of common stock were
available for future option grant. The share reserve under the 1992 Stock Option
Plan has an automatic share increase feature.

      Subject to adjustment from time to time, the maximum number of shares of
common stock for which any one individual participating in the 1992 Stock Option
Plan may be granted stock options or separately exercisable stock appreciation
rights per calendar year, beginning with the 1999 calendar year, is 5,000,000
shares.

      The 1992 Stock Option Plan contains two separate option grant programs:
(i) a discretionary option grant program under which key employees, non-employee
directors and consultants may be granted options to purchase shares of common
stock at a fixed price per share and (ii) an automatic option grant program
under which eligible non-employee directors will automatically receive a special
one-time option grant. Options granted under the discretionary option grant
program are either incentive stock options designed to meet the requirements of
Section 422 of the Internal Revenue Code or non-statutory options not intended


                                       49
<PAGE>

to satisfy such requirements. All grants under the automatic option grant
program are non-statutory options.

      The board of directors may terminate the 1992 Stock Option Plan at any
time. Any options outstanding at the time of such termination will continue to
remain outstanding and exercisable in accordance with the terms and provisions
of the instruments evidencing those grants. The 1992 Stock Option Plan will,
however, automatically terminate on the date all shares available for issuance
are issued as vested shares or cancelled pursuant to the exercise, surrender or
cash-out of outstanding options under the plan.

      Discretionary Option Grant Program

      The compensation committee of the board of directors administers the
discretionary option grant program. The compensation committee, as administrator
of this program, has full authority to determine the eligible individuals who
are to receive option grants and/or stock appreciation rights, the type of
option (incentive stock option or non-statutory stock option) or stock
appreciation right (tandem or limited) to be granted, the number of shares to be
covered by each granted option or right, the date or dates on which the option
or right is to become exercisable and the maximum term for which the option or
right is to remain outstanding.

      Options granted under this program may either become exercisable in
periodic installments over the individual's period of service or may be
immediately exercisable for all the option shares at the exercise price paid per
share in the event the individual leaves our service prior to vesting in these
shares. Under the discretionary option grant provision of the 1992 Stock Option
Plan, we may grant options, for incentive stock option grants, at an exercise
price equal to the fair market value on the date of grant or, for non-statutory
grants, at an exercise price less than, equal to or greater than the fair market
value of the common stock on the date of grant. No option may be granted with a
term exceeding ten years. However, each such option may be subject to earlier
termination within a designated period following the optionee's cessation of
service with us. Options are not assignable or transferable by the optionee
except by will or the laws of inheritance following the optionee's death. The
optionee will not acquire any shareholder rights with respect to the option
shares until the option is exercised and the purchase price is paid for the
shares.

      The option price may be paid in cash or in shares of common stock held by
the optionee. The compensation committee may also permit an option holder to pay
the option price for the purchased shares through a loan payable in installments
over a period of years.

      In the event we are acquired, whether by a merger or asset sale, each
option at the time outstanding will automatically become exercisable for all of
the option shares at the time subject to such option and may be exercised for
any or all of such shares. However, an outstanding option will not so accelerate
if it is to be assumed by the successor corporation or the acceleration of such
option is subject to other limitations imposed by the compensation committee at
the time of the grant.

      The compensation committee also has full power and authority, exercisable
either at the time the option is granted or at any time while the option remains
outstanding, to provide for the automatic acceleration of one or more
outstanding options in the event of a change in control of Shaman (whether by
hostile tender offer for more than 50% of the outstanding voting stock or proxy
contest of the election of board members) so that each such option will become
exercisable, immediately prior to such change in control, for the total number
of shares of common stock at the time subject to such option.

      Should an option expire or terminate for any reason prior to exercise in
full, the shares subject to the portion of the option not so exercised will be
available for subsequent grant under the 1992 Stock Option Plan. In addition,
unvested shares issued under the Plan and subsequently repurchased by us at the
option exercise price paid per share will be added back to the share reserve and
will accordingly be available for subsequent issuance under the 1992 Stock
Option Plan. However, shares subject to any option surrendered or cancelled in
accordance with the stock appreciation right provisions of the 1992 Stock Option
Plan will not be available for subsequent grants.

      Automatic Option Grant Program

      All grants under the automatic option grant program must be in strict
compliance with the express provisions of that program and no administrative
discretion will be exercised by the compensation committee of the board of
directors. Under the automatic option grant program each non-employee director
will receive:

                                       50
<PAGE>

           (i) On February 1, 2000, a one-time option grant if he or she is
      serving as a non-employee director at that time. The option will allow
      each such non-employee director to purchase that number of shares of
      common stock equal to one half of one percent (.05%) of the number of
      voting shares of the company's capital stock outstanding at that time; and

           (ii) Upon his or her initial appointment or election to the board of
      directors, a special one-time option grant for that number of shares of
      common stock equal to one half of one percent (0.5%) of the number of
      voting shares of the company's capital stock outstanding on February 1,
      2000, provided such individual has not previously been employed by the
      company.

      Each option granted under the automatic option grant program will have an
exercise price per share equal to the fair market value per share of common
stock on the grant date payable in cash or shares of common stock, and a maximum
term of ten years, subject to earlier termination upon the optionee's cessation
of board service. The grant will become exercisable for the option shares in a
series of 48 successive equal monthly installments over the optionee's period of
continued board service, measured from the grant date. However, the option will
become immediately exercisable for all of the option shares in the event of an
acquisition of Shaman by merger or asset sale or a hostile takeover by tender
offer for more than 50% of the outstanding voting stock or proxy contest for
board membership.


      In addition, each option grant will be automatically cancelled upon the
successful completion of a hostile tender offer for more than 50% of Shaman's
outstanding voting securities. In return, the optionee will be entitled to a
cash distribution from the company in an amount per cancelled option share equal
to the excess of (a) the highest price per share of common stock paid in
connection with the tender offer over (b) the exercise price payable for such
share.


401(k) Plan


      We have a tax qualified salary deferral program under Section 401(k) of
the Internal Revenue Code. Under this program, any employee of Shaman may elect
to contribute up to 20% of his or her eligible earnings per pay period, up to
the maximum amount permitted per calendar year under the Federal tax laws. The
contributed earnings are credited to the employee's account under the 401(k)
Plan, and the account is held in trust as part of the plan assets. Each account
under the 401(k) Plan will be adjusted periodically to reflect its share of the
investment gains, earnings and losses of the trust fund, and the employee may
receive an in service loan distribution until the individual leaves Shaman's
employ, dies or becomes disabled. Alternatively, a terminated employee may defer
the distribution of the account balance until age 65. Although the 401(k) Plan
permits us to make contributions to the plan which either match in whole or in
part the salary deferral contributions made by the participants or which are
otherwise to be allocated to the accounts of participants on the basis of their
eligible earnings for the plan year for which such contribution is made, we have
to date made no contributions to the 401(k) Plan.


Employment Contracts, Termination Agreements and Change of Control Agreements

      On March 15, 1999, the board of directors approved a change in control
provision concerning severance benefits for key executives. Pursuant to this
provision, should their employment with us terminate within 12 months after a
change in control, for any reason other than for cause, they will be entitled to
receive in one lump sum payment the cash equivalent of 12 months of base salary
plus any benefits to which they would otherwise be entitled. In connection with
these severance benefits, we have agreed to pay the premiums for any COBRA
coverage to which these individuals or their spouse or dependents are entitled
under a company sponsored medical plan after a change in control. In addition,
in the event of a change in control, all of the options held by such key
executives will automatically become fully vested and exercisable. Such
executives' exercisable shares will be fixed at the termination of their
employment, and they will have a period of 90 days from their termination date
to purchase such exercisable shares, as set forth in the stock option agreements
applicable to their options.

      On May 27, 1998, we entered into a letter agreement with Stephanie C. Diaz
pursuant to which she served as Vice President, Chief Financial Officer,
commencing in June 1998. Pursuant to the letter agreement, Ms. Diaz was paid an
annual salary of $135,000 in addition to a $15,000 sign-on bonus. In addition,
Ms. Diaz was granted an option for 2,250 shares of common stock on June 30, 1998
with an exercise price per share of $67.50, the fair market value per share of
common stock on that date. The option became exercisable for 12.5% of the option
shares upon completion of six months of employment and for the balance of the
option shares in 42 equal monthly installments over the next 42 months of
employment. In the event Ms. Diaz's employment is terminated other than for
cause, she was to be paid salary and benefits for six months or until she
obtained full-time employment, whichever occurs first. Ms. Diaz resigned from
Shaman effective January 4, 1999. In connection with a revised agreement, Ms.


                                       51
<PAGE>

Diaz received a payment of three months salary and the continuance of the
exercise period under existing options for a period of 12 months following
termination of her employment.


      On March 30, 1998, we entered into a letter agreement with John W.S. Chow,
Ph.D. pursuant to which he was served as Vice President, Technical Operations,
commencing in May 1998. Pursuant to the letter agreement, Dr. Chow was to be
paid an annual salary of $165,000 in addition to the sign-on bonus paid to him
in the amount of $10,000, and he was to be reimbursed, in an amount not to
exceed $25,000, for closing costs incurred in the sale of his former residence
in New Jersey and the purchase of his new residence in the Bay Area. Dr. Chow
will, however, be obligated to repay a prorated portion of both the sign-on
bonus and the reimbursed closing costs should he resign from the company within
two years after his hire date. Dr. Chow was also granted an option for 2,500
shares of common stock on May 15, 1998 with an exercise price per share of
$98.75, the fair market value per share of common stock on that date. The option
will become exercisable in a series of monthly installments over the four year
period measured from the grant date as follows: 10% of the option shares will
become exercisable upon his completion of six months of employment measured from
such grant date, an additional 30% of the option shares will become exercisable
in a series of 18 successive equal monthly installments upon his completion of
each additional month of employment over the next 18 months thereafter, and the
remaining 60% of the option shares will become exercisable in a series of 24
successive equal monthly installments upon his completion of each additional
month of employment during the 3rd and 4th years of employment measured from the
grant date. Dr. Chow was also granted an additional 750 shares of common stock
on May 15, 1998 with an exercise price of $98.75, the fair market value per
share of common stock on that date. The 750 share grant will become exercisable
as follows: 375 shares upon Dr. Chow's completion of three years of employment
measured from the grant date, and the remaining 375 shares upon his completion
of four years of employment measured from the grant date. We further agreed to
pay Dr. Chow's reasonable moving expenses in an amount not to exceed $20,000 and
to provide him with an apartment for up to four months at a rental not to exceed
$2,500 per month. Should we terminate Dr. Chow's employment for any reason other
than for cause prior to May 1, 2001, we would continue to pay Dr. Chow's base
salary plus benefits on a monthly basis for up to six months or until Dr. Chow
obtains near full-time employment or consulting of at least 80% of his time,
whichever occurs sooner. We also extended a $300,000 loan to Dr. Chow in
connection with his purchase of a new residence in the Bay Area. See "Certain
Relationships and Related Transactions."

      On August 21, 1997, we entered into a letter agreement with James
Pennington, Ph.D. pursuant to which he served as Senior Vice President, Clinical
Research and Chief Medical Officer, commencing October 1997. Pursuant to the
letter agreement, Dr. Pennington was paid an annual salary of $255,000 in
addition to a sign-on bonus paid to him in the amount of $60,000. In addition,
Dr. Pennington was granted, on September 16, 1997, an option to purchase 6,250
shares of common stock at a purchase price of $121.25 per share. The option had
a term of 10 years and was to become exercisable as follows: 12.5% of the option
shares upon Dr. Pennington's completion of six months of service, measured from
the grant date, and the balance of the option shares in 42 successive equal
monthly installments upon his completion of each of the next 42 months of
service thereafter. In the event that Dr. Pennington's employment is terminated
other than for cause, he would be entitled to receive salary and benefits for
nine months, or, if sooner, until Dr. Pennington obtained near full time
employment or consulting of at least 80% of his time. On February 15, 1999, we
entered into a new agreement with Dr. Pennington in connection with his
resignation as Senior Vice President, Clinical Research and Chief Medical
Officer, effective February 19, 1999. Under this agreement, payments will
continue to be made to Dr. Pennington in compliance with the terms of the
agreement described above. In addition, options previously granted to him will
continue to vest during this period following his termination.

      On February 9, 1996, we entered into a letter agreement with Atul S.
Khandwala, Ph.D. pursuant to which he served as Senior Vice President,
Development, commencing March 1996. Pursuant to the letter agreement, Dr.
Khandwala was paid an annual salary of $225,000. In addition, Dr. Khandwala was
granted an option to purchase 6,000 shares of common stock at a purchase price
of $137.50 per share. The option had a term of ten years and would become
exercisable over a four-year period in a series of 48 successive equal monthly
installments upon Dr. Khandwala's completion of each month of service with the
company over the four-year period measured from March 1, 1996. In the event Dr.
Khandwala's employment is terminated by us for any reason, Dr. Khandwala would
receive salary and benefits for a period of six months. On August 24, 1998, we
entered into a severance agreement with Dr. Khandwala in connection with his
resignation as Senior Vice President, Development and Chief Regulatory Officer
on October 2, 1998. Under this agreement, we will continue to forgive the
remaining balance of his loan over the remaining two and one half years of the
loan term, provided that Dr. Khandwala continues to provide consulting services
to us. On October 28, 1998, we entered into an agreement with Dr. Khandwala
pursuant to which he rendered consulting services to us through April 2, 1999.
In connection with this agreement, we issued to Dr. Khandwala 4,366 shares of
common stock and loaned him the funds necessary to satisfy the federal and state
withholding taxes applicable to those shares. In addition, we granted Dr.
Khandwala an option to purchase 2,000 shares of common stock at an exercise


                                       52
<PAGE>

price of $28.75, the fair market value of our common stock on October 20, 1998.
The option will become exercisable in six successive equal monthly installments
on the last day of each month during the consulting period.


      None of our other executive officers have employment agreements with us,
and their employment may be terminated at any time at the discretion of the
board of directors. As administrator of the 1992 Stock Option Plan, the
compensation committee has the authority to provide for accelerated vesting of
the shares of common stock subject to any outstanding options held by the Chief
Executive Officer and our other executive officers or any unvested shares
actually held by those individuals under the 1992 Stock Option Plan upon a
change in control of Shaman effected through a successful tender offer for more
than 50% of our outstanding voting securities or through a change in the
majority of the board as a result of one or more contested elections for board
membership.

Indemnification  of Directors  and  Executive  Officers and  Limitation of
Liability

      Our Restated Certificate of Incorporation and Bylaws provide for
indemnification of directors, officers and other agents of Shaman. Each of the
current directors and certain officers and agents of Shaman have entered into
separate indemnification agreements with us.

Certain Relationships and Related Transactions


      On June 17, 1998, we loaned $300,000 to John W.S. Chow, Ph.D., Vice
President, Technical Operations, to reimburse him for a reasonable difference
between the purchase price of his residence in the Bay Area and the cost of
comparable housing in New Jersey, his former state of residence. The loan is
evidenced by his promissory note of the same date which will become due and
payable in a series of five successive equal annual installments, with the first
such installment due on June 25, 1999. The note will bear interest at a variable
per annum rate equal to the short-term applicable federal rate in effect under
the federal tax laws for January of each calendar year the loan remains
outstanding. Accordingly, the interest rate in effect for the period Dr. Chow's
note was outstanding during the 1998 calendar year was 5.52%. Accrued and unpaid
interest will become due and payable each year on the same date the principal
installment for that year becomes payable. Each installment of principal and
accrued interest will automatically be forgiven as that installment becomes due,
provided Dr. Chow continues in our employ. However, the entire unpaid balance of
the note, together with all accrued and unpaid interest, will become immediately
due and payable upon Dr. Chow's termination of employment with us prior to June
25, 2003, unless Dr. Chow's employment is involuntarily terminated by us other
than for cause. In the event (i) we terminate Dr. Chow's employment for any
reason other than for cause or (ii) Dr. Chow's employment terminates by reason
of his death or disability, then the entire principal balance of the note plus
accrued interest will be forgiven. The amount outstanding on Dr. Chow's note
(including accrued interest) was approximately $313,188 as of March 31, 1999 and
the highest amount outstanding on that note during the 1998 fiscal year was
$308,729.


      See "Employment Contracts, Termination Agreements and Change of Control
Agreements" and "Director Compensation" with respect to further transactions
between us and our officers and directors.


                                       53
<PAGE>

                             PRINCIPAL STOCKHOLDERS


      The following table sets forth certain information known to us with
respect to the beneficial ownership of the common stock as of March 31, 1999 by
(i) all persons who are beneficial owners of five percent or more of the common
stock, (ii) each director, (iii) the Named Officers in the Summary Compensation
Table above and (iv) all current directors and executive officers as a group.
The number of shares beneficially owned by each director or executive officer is
determined under rules of the SEC and the information is not necessarily
indicative of beneficial ownership for any other purpose. Shares of common stock
subject to options or warrants currently exercisable or exercisable within 60
days of March 31, 1999 are deemed to be beneficially owned by the person holding
such option or warrant for computing the percentage ownership of such person,
but are not treated as outstanding for computing the percentage of any other
person. Except as otherwise indicated, we believe that the beneficial owners of
the common stock listed below, based upon such information furnished by such
owners, have sole investment power with respect to such shares, subject to
community property laws where applicable.

      The percentages set forth in the percent column under the beneficial
ownership after the rights offering heading have been calculated based on the
assumption that each stockholder would subscribe for the stockholder's pro-rata
portion, determined as of March 31, 1999, of this rights offering, and assuming
the conversion of all outstanding Series R Preferred Stock. In the event each
stockholder subscribes for the stockholder's pro-rata portion of the rights
offering, the stockholders' beneficial ownership percentage of Shaman after the
rights offering will not be identical to its beneficial ownership percentage of
Shaman prior to the rights offering because SEC regulations require that we
include stock options exercisable within 60 days of March 31, 1999, for purposes
of the calculations in the table. However, for determining each stockholder's
pro-rata portion of the rights offering, we only include the Shaman common stock
owned by each stockholder and did not include exercisable or unexercisable
options.

      To the extent any stockholder chooses not to subscribe for its pro-rata
portion of the rights offering, its beneficial ownership of Shaman after the
rights offering will be less than is indicated in this table. If any stockholder
chooses to subscribe for more than its pro-rata portion of the rights offering,
its beneficial ownership will be greater than is indicated in this table.

<TABLE>
<CAPTION>

                                               Benefits Ownership Prior               Benefits to Ownership After
                                                to the Rights Offering                    the Rights Offering
                                       -----------------------------------------   ---------------------------------
           Name and Address                Shares              Percent                   Shares          Percent
- -------------------------------------  ---------------  ------------------------   ---------------  ----------------
<S>                                    <C>              <C>
Vulcan Ventures, Inc. (3)..........          104,000             5.43%
  110 110th Avenue N.W.
  Suite 550
  Bellevue, WA  98004
Lisa A. Conte (4)..................           44,165             2.28%
Steven R. King, Ph.D. (5)..........            5,587                *
James E. Pennington, M.D. (6)......            2,083                *
Gerald R. Reaven, M.D. (7).........            7,192                *
John Chow (8)......................              708                *
J.D. Haldeman (9)..................              722                *
Laurie Peltier (10)................              833                *
Atul S. Khandwala, Ph.D. (11)......            2,000                *
Thomas Carlson, M.D. (12)..........            3,059                *
G. Kirk Raab (13)..................           15,502                *
Adrian D.P. Bellamy (14)...........              979                *
Jeffrey Berg (15)..................              208                *
Herbert H. McDade, Jr. (16)........            2,027                *
M. David Titus (17)................            1,923                *
Current Officers and Directors as
a group (18)
(12 persons).......................           82,904             4.21%

</TABLE>
- ----------------------
*.....Less than 1.0%

(1)   Percentage of beneficial ownership is calculated assuming 1,916,858 shares
      of common stock were outstanding as of March 31, 1999. Beneficial
      ownership is determined in accordance with the rules of the Securities and
      Exchange Commission and generally includes voting or investment power with
      respect to securities. Shares of common stock subject to options or
      warrants currently exercisable or convertible, or exercisable or
      convertible within 60 days of March 31, 1999, are deemed outstanding for
      computing the percentage of the person holding such option or warrant but


                                       54
<PAGE>

      are not deemed outstanding for computing the percentage of any other
      person. Except as indicated in the footnotes to this table and pursuant to
      applicable community property laws, the persons named in the table have
      sole voting and investment power with respect to all shares of common
      stock beneficially owned.

(2)   This table is based upon information supplied to us by executive officers,
      directors and stockholders owning greater than five percent, as set forth
      in filings required by the Securities and Exchange Commission or as
      otherwise provided. The address of each officer and director identified in
      this table is that of the company's executive offices, 213 East Grand
      Avenue, South San Francisco, CA 94080. Unless otherwise indicated in the
      footnotes to this table and subject to applicable community property laws,
      each of the stockholders named in this table has sole voting and
      investment power with respect to the shares shown as beneficially owned by
      it, him or her.

(3)   Does not include 20,000 shares of Series C Preferred Stock which is
      convertible into shares of common stock, such number which is determined
      in accordance with that certain Series C Stock Purchase Agreement.

(4)   Includes 21,050 shares subject to options exercisable within 60 days of
      March 31, 1999.

(5)   Includes 4,824 shares subject to options exercisable within 60 days of
      March 31, 1999.

(6)   Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(7)   Includes 7,167 shares subject to options exercisable within 60 days of
      March 31, 1999.

(8)   Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(9)   Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(10)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(11)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.  Dr. Khandwala resigned from Shaman in October 1998.

(12)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(13)  Includes 8,719 shares subject to options exercisable within 60 days of
      March 31, 1999. Does not include 1,500 shares of Series C Preferred Stock
      which is convertible to a certain number of shares of common stock, such
      number which is determined in accordance with that certain Series C Stock
      Purchase Agreement.

(14)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(15)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(16)  Represents shares subject to options exercisable within 60 days of March
      31, 1999.

(17)  Includes 1,673 shares subject to options exercisable within 60 days of
      March 31, 1999.

(18)  Includes shares held by family members associated with directors and
      officers listed above. Also includes 51,969 shares which are currently
      issuable upon the exercise of outstanding options.


                                       55
<PAGE>

                        DESCRIPTION OF OUR CAPITAL STOCK


      Our authorized capital stock consists of 220,000,000 shares of common
stock, par value $0.001 per share, and 12,000,000 shares of preferred stock, par
value $0.001 per share. We have designated 400,000 shares of our preferred stock
as Series A Preferred Stock, all of which are issued and outstanding; 200,000
shares as Series C Preferred Stock, 115,958 of which are issued and outstanding;
6,285 shares as Series D Preferred Stock, 1,898 of which are issued and
outstanding; and 10,000,000 shares as Series R Preferred Stock, none of which
are issued and outstanding, but up to 7,500,000 shares of which are subject to
issuance in this offering and up to 548,344 shares of which are subject to
issuance upon exercise of outstanding warrants.


Common Stock

      As of April 30, 1999, there were 2,226,852 shares of common stock
outstanding held of record by approximately 952 stockholders. The holders of
common stock are entitled to one vote per share on all matters to be voted upon
by the stockholders. Subject to preferences that may be applicable to
outstanding preferred stock, the holders of common stock are entitled to receive
ratably such dividends, if any, as may be declared by the board of directors out
of funds legally available therefor. See "Dividend Policy."

      In the event of our liquidation, dissolution, sale or winding up, the
holders of common stock are entitled to share ratably in all assets remaining
after payment of liabilities, subject to prior distribution rights of preferred
stock then outstanding. The common stock has no preemptive or conversion rights
or other subscription rights. There are no redemption or sinking fund rights
applicable to the common stock. All outstanding shares of common stock are fully
paid and nonassessible.

Preferred Stock

      Our board of directors has the authority to issue preferred stock in one
or more series and to fix the rights, preferences, privileges and restrictions
thereof, including dividend rights, conversion rights, voting rights, terms of
redemption, redemption prices, liquidation preferences and the number of shares
constituting any series or the designation of such series, without the further
vote or action by the holders of common stock. The approval of the outstanding
shares of existing series of preferred stock would be required for the issuance
of any additional series of preferred stock with rights, preferences or
privileges senior to those of the existing series of preferred stock. The
issuance of preferred stock may delay, defer, or prevent a change in control of
Shaman without further action by the stockholders and may adversely affect the
voting and other rights of the holders of common stock.

Series A Preferred Stock

      As of April 30,1999, there were 400,000 shares of Series A Preferred Stock
outstanding held of record by one stockholder.

      Voting. Each holder of Series A Preferred Stock is entitled to that number
of votes equal to the number of shares of common stock into which the shares of
Series A Preferred Stock held by such stockholder are convertible and has voting
rights and powers equal to those of the common stock, except as otherwise
expressly provided or as required by law.

      Dividends. Subject to preferential rights with respect to any series of
preferred stock which may from time to time come into existence, holders of
Series A Preferred Stock are entitled to receive such dividends as may be
declared by the Board of Directors out of funds legally available therefor. Any
dividends declared on the Series A Preferred Stock are not cumulative.

      Liquidation Preference. In the event of a liquidation, dissolution, sale
or winding up of Shaman, holders of Series A Preferred Stock are entitled to
receive $8.15 per share (as adjusted for any stock dividends, combinations or
splits with respect to such shares) plus all accrued or declared but unpaid
dividends. If the assets and funds of Shaman legally available for distribution
to the holders of the Series A Preferred Stock are insufficient to permit
payment of the full preferential amount, then holders of the Series A Preferred
Stock are entitled to share ratably the entire amount of such assets or funds
legally available for distribution.


      Conversion. Each share of Series A Preferred Stock is convertible into one
share of common stock, as adjusted for any stock dividends, combinations or
splits with respect to such shares, at any time at the option of the holder. The


                                       56
<PAGE>

minimum number of shares which may be converted at any one time is 75,000
shares, or such lesser number of shares as are then outstanding. Each share of
Series A Preferred Stock shall automatically convert into common stock on the
earlier to occur of: (i) immediately in the event that at any time prior to July
23, 1999, the closing sale price of our common stock for a period of 60
consecutive trading days exceeded $163.00 per share; or (ii) July 23, 1999. If
the Series A Preferred Stock is automatically converted on July 23, 1999, the
conversion price into common stock is adjusted such that each share of Series A
Preferred Stock will automatically convert into such number of shares of common
stock as equals $163.00 divided by the weighted-average closing sale price for
the 60 consecutive trading days ending two days prior to July 23, 1999, but in
no event shall a share of Series A Preferred Stock be convertible into more than
1.358 shares of common stock, in each case as appropriately adjusted for any
stock dividends, combinations or splits with respect to such shares of common
stock.

      Redemption. The Series A Preferred Stock is not redeemable.

      Priority. The Series A Preferred Stock ranks senior to the common stock
and the Series R Preferred Stock and junior to the Series C Preferred Stock and
the Series D Preferred Stock, if issued, as to dividends, distributions and
distribution of assets upon liquidation, dissolution or winding up of Shaman.

Series C Preferred Stock

      As of April 30,1999, there were 115,958 shares of Series C Preferred Stock
outstanding held of record by 21 stockholders.


      Voting. The holders of the Series C Preferred Stock are entitled (i)
during the first year after the date of issuance thereof (August 18, 1998) to
six votes for each one share of Series C Preferred Stock held; and (ii)
thereafter, to one vote for each share of common stock into which such share of
Series C Preferred Stock is convertible on the record date for the matter to be
voted on.


      Dividends. Each share of Series C Preferred Stock shall be entitled to
receive cumulative dividends paid semi-annually on May 30 and November 29 of
each year as follows: (i) a stock-on-stock dividend of $10.00 per annum, paid in
arrears, in shares of common stock (valued at 85% of the average closing price
of the common stock for the 10 trading day period ending three trading days
prior to the date on which the dividend is paid); plus (ii) a cash amount
equaling 0.00005% of the Shaman's United States net sales, if any, for the
preceding two calendar quarters of its SP-303/Provir product for the treatment
of diarrhea less $5.00 (the value of the semi-annual stock dividend). We have
agreed to honor this royalty with our sales of SB-300, to the extent sold to the
HIV/AIDS Community. If under Delaware law, we are unable to pay the cash amount
of the above described dividend, then the cash portion shall be payable in
shares of common stock (valued at 85% of the average closing price of the common
stock for the 10 day trading period ending three trading days prior to the date
on which the dividend is paid).


      Liquidation Preference. In the event of a liquidation, dissolution, sale
or winding up of Shaman, holders of the Series C Preferred Stock shall be
entitled to receive, prior and in preference to the holders of the common stock,
the Series A Preferred Stock, and the Series D Preferred Stock and the Series R
Preferred Stock, an amount equal to $100 per share, plus any accrued and unpaid
dividends.


      Conversion. Each share of Series C Convertible Preferred Stock shall be
convertible, at any time commencing on August 18, 1999 at the election of each
holder, and automatically on August 18, 2004, into the greater of (i) 0.8333
shares of common stock or (ii) such number of shares of common stock as equals
$100 divided by 85% of the average closing price of the common stock for the 10
trading day period ending three trading days prior to the date of conversion.

      Redemption. The Series C Preferred Stock is not redeemable.

      Priority. The Series C Preferred Stock ranks senior to the common stock,
the Series A Preferred Stock, the Series D Preferred Stock and the Series R
Preferred Stock as to dividends, distributions and distribution of assets upon
liquidation, dissolution or winding up of Shaman.

Series D Preferred Stock

      As of April 30, 1999, there were 1,898 shares of Series D Preferred Stock
outstanding held of record by six stockholders.

                                       57
<PAGE>

      Voting. Except as otherwise required by law or expressly provided
in the certificate of incorporation, the Series D Preferred Stock is not
entitled to vote on any matter.

      Dividends. Each share of Series D Preferred Stock shall be entitled to
receive cumulative dividends at the rate of $55 per year payable quarterly
commencing on February 1, 1999. These dividends may be paid in cash or, subject
to certain limitations, any combination of cash and shares of common stock.
Dividends not paid on the due date shall accrue interest until paid at the rate
of 12% per annum. If the dividend is paid in shares of common stock, the number
of shares to be delivered to each holder of Series D Preferred Stock shall be
determined by dividing the aggregate dollar amount of the dividend payable to
each such holder by an amount equal to 90% of the outstanding price of the
common stock during 12 trading days ending one day prior to the date of the
conversion.


      Liquidation Preference. In the event of a liquidation, dissolution, sale
or winding up of Shaman, holders of the Series D Preferred Stock shall be
entitled to receive, prior and in preference to the holders of the common stock,
the Series A Preferred Stock and the Series R Preferred Stock, but subordinate
to the holders of the Series C Preferred Stock, an amount equal to $1,000 per
share, plus any accrued and unpaid dividends.


      Conversion. Each share of Series D Convertible Preferred Stock shall be
convertible at the election of the holder, at any time commencing on the date on
which any shares of Series D Preferred Stock were first issued, into a number of
shares of common stock equal to $1,000 plus any accrued but unpaid dividends and
interest on the Series D Preferred Stock, divided by 90% of the lowest trading
price of the common stock during the 12 trading days ending one day prior to the
date of the conversion.


      The delisting of our common stock from The Nasdaq National Market on
February 2, 1999 constituted an Optional Redemption Event (as defined in our
Certificate of Incorporation). In connection therewith, on February 4, 1999, we
issued a Control Notice (as defined in the Certificate of Incorporation) that
prevented the redemption of the Series D Preferred Stock. This Control Notice
will remain in effect for as long as we are not listed on any of The Nasdaq
National Market, The Nasdaq SmallCap Market, the American Stock Exchange or the
New York Stock Exchange. Delivery of the Control Notice had the effect of
increasing the annual dividend to $180 per share and adjusting the conversion
price of the Series D Preferred Stock to 72% of the lowest trading price during
a designated time period prior to the conversion.


      Redemption. The holders of the Series D Preferred Stock may require that
we redeem all or part of their shares if any of the following optional
redemption events occur: (i) for five consecutive trading days there is no
reported sale price of our common stock on Nasdaq, the New York Stock Exchange
or the American Stock Exchange, (ii) our common stock ceases to be listed on
Nasdaq, the NYSE or the AMEX, (iii) we merge or effect another transaction in
which we sell all or substantially all of our assets or our stockholders prior
to the transaction do not collectively own at least 51% of the voting securities
of the surviving corporation, or the common stock of the surviving corporation
is not listed on Nasdaq, the NYSE or the AMEX, (iv) we adopt changes to our
certificate of incorporation that materially and adversely affect the rights of
the holders of the Series D Preferred Stock in a different and more adverse
manner than they affect the rights of the holders of the common stock, (v) if
the holders are unable for a period ranging from 20 to 30 days to sell their
shares of common stock issuable upon conversion of the Series D Preferred Stock
pursuant to an effective registration statement, or (vi) if we fail or default
in performing any material obligation to a holder of Series D Preferred Stock
under the terms of our certificate of incorporation or the Series D Preferred
Stock purchase agreement. The per share redemption price is $1,000 plus 118% of
accrued but unpaid dividends on each share of Series D Preferred Stock.

      We may under certain circumstances issue a control notice upon the
occurrence of any of the three optional redemption events described in clauses
(i), (ii) and (iii) above, which will prevent the requirement that we redeem the
shares. The issuance of this control notice has the effect of increasing the
annual cumulative dividend payable to the Series D Preferred Stockholders to
$180 per share (if the redemption event was one of those described in clause (i)
or (ii) above) or $300 per share (for the redemption event described in clause
(iii) above), and adjusting the conversion price of the Series D Preferred Stock
to 72% of the lowest trading price for a designated period prior to the
conversion (if the redemption event was one of those described in clause (i) or
(ii) above), or 63% of the lowest trading price for a designated period prior to
the conversion (for the redemption event described in clause (iii) above).

      The delisting of our common stock from The Nasdaq National Market in
February 1999 constituted an optional redemption event for our Series D
Preferred Stock. Since we do not have adequate resources to pay to redeem the
Series D Preferred Stock, we have issued the control notice to the holders of
the Series D Preferred Stock as required under our charter that prevented the
redemption of the Series D Preferred Stock. The notice preventing the redemption
of the Series D Preferred Stock will remain in effect for as long as our
securities are not listed on any of The Nasdaq National Market, The Nasdaq
SmallCap Market, the AMEX or the NYSE.

                                       58
<PAGE>

      Priority. The Series D Preferred Stock ranks senior to the common stock,
the Series A Preferred Stock and the Series R Preferred Stock but junior to the
Series C Preferred Stock as to dividends, distributions and distributions of
assets upon liquidation, dissolution or winding up of Shaman.

Series R Preferred Stock


      Upon completion of this offering, up to 7,500,000 shares of Series R
Preferred Stock will be outstanding. The Series R Convertible Preferred Stock
will have the following rights, preferences and privileges:

      Voting. The holders of the Series R Preferred Stock are entitled to 10
votes for each share of Series R Preferred Stock held.

      Dividends. Subject to preferences that may be applicable to outstanding
preferred stock, the holders of Series R Preferred Stock are entitled to receive
ratably with the holders of the common stock, such dividends, if any, as may be
declared by the board of directors out of funds legally available therefor. See
"Dividend Policy."

      Liquidation Preference. In the event of a liquidation, dissolution, sale
or winding up of Shaman, holders of the Series R Preferred Stock shall be
entitled to receive, prior and in preference to the holders of the common stock,
but subordinate to the holders of the Series A, Series C and Series D Preferred
Stock, an amount equal to $2.00 per share, plus any accrued and unpaid
dividends.



      Conversion. The Series R Preferred Stock is not convertible until February
1, 2000. On that date, each share of Series R Preferred Stock shall be
automatically converted into a number of shares of common stock equal to $2.00
divided by the lower of (i) $_______, which is equal to 10% of the average
closing sales price for the common stock for the 10 trading days ending three
trading days prior to the date of this prospectus, or (ii) the per share price
that is equal to 10% of the average closing sales price of our common stock for
the 10 trading day period ending three trading days prior to February 1, 2000.

      Redemption. The Series R Preferred Stock is not redeemable.


      Priority. The Series R Preferred Stock ranks equally with the common stock
and junior to the Series A, Series C and Series D Preferred Stock as to
dividends, and ranks senior to the common stock but junior to the Series A,
Series C and Series D Preferred Stock as to distributions of assets upon
liquidation, dissolution or winding up of Shaman.

Warrants


      As of April 30, 1999, there were outstanding warrants to purchase an
aggregate of 104,833 shares of common stock at a weighted average exercise price
of $115.20 per share, and outstanding warrants to purchase an aggregate of
548,344 shares of Series R Preferred Stock at an exercise price of $2.00 per
share.


      Between September 1990 and September 1993, we issued, in connection with
equipment lease financings, warrants to purchase 4,585 shares of common stock at
prices ranging from $48.00 to $216.60 per share. These warrants expire between
September 2000 and September 2002.

      In July 1996, we issued to one investor warrants to purchase an aggregate
of 27,500 shares of common stock. These warrants are exercisable through July
26, 2002 at an exercise price of $203.68 per share. We have filed a registration
statement with the SEC for the resale of shares issued upon exercise of these
warrants, which registration statement was declared effective on November 30,
1998.


      In May 1997, we issued, in connection with a debt financing, warrants to
purchase 10,000 shares of common stock at an exercise price of $125.00 per
share. These warrants expire on May 7, 2007.


      In March 1998, we issued to certain investors warrants to purchase an
aggregate of 6,875 shares of common stock. These warrants are exercisable
through March 18, 2001 at an exercise price of $150.00 per share. We have filed
a registration statement with the SEC for the resale of shares issued upon
exercise of these warrants, which registration statement was declared effective
on July 10, 1998.

      In June 1998, we issued to certain investors warrants to purchase an
aggregate of 17,500 shares of common stock. These warrants are exercisable
through June 22, 2003 at an exercise price per share equal to 115% of the


                                       59
<PAGE>

average trading price of the common stock during specified measurement periods.
These warrants provide for adjustment of the number of shares of common stock
issuable upon exercise thereof, including upon the distribution of certain
dividends, upon our reorganization, reclassification or merger, or upon the
division or combination of our common stock. We have filed a registration
statement with the SEC for the resale of shares issued upon exercise of these
warrants, which registration statement was declared effective on July 10, 1998.

      In December 1998, we issued to certain investors warrants to purchase an
aggregate of 38,373 shares of common stock. These warrants are exercisable
through December 10, 2003 at an exercise price per share equal to $61.40 per
share.


      In April 1999, we issued to MMC/GATX Partnership No. 1 in connection with
the amendment of a loan agreement with GATX a cashless exercise warrant to
purchase 296,342 shares of the class and series of equity securities which are
being registered in this offering (i.e. the Series R Preferred Stock). This
warrant is exercisable commencing on the date of this prospectus and through the
seventh anniversary date of the earlier to occur of (i) December 31, 1999, or
(ii) the date of this prospectus, subject to acceleration upon certain events.
The per share exercise price will be $2.00 (the per share price at which the
Series R Preferred Stock is sold hereunder).

      In April 1999, we also issued to various lenders who were either existing
stockholders, key executives or directors of Shaman cashless exercise warrants
to purchase an aggregate of 249,502 shares of the class and series of equity
securities which are being registered in this offering (i.e. the Series R
Preferred Stock). These warrants are exercisable commencing upon the
consummation of the sale of the Series R Preferred Stock registered hereunder
and through the third anniversary date of such consummation, subject to
acceleration upon certain events. The per share exercise price will be $2.00
(the per share price at which the Series R Preferred Stock is sold hereunder).


Credit Facility Convertible Promissory Notes


      Pursuant to the terms of our credit facility and note purchase agreement
with various lenders, at such time as we request funding of the credit facility
and receive the funds, we will issue senior subordinated secured convertible
promissory notes that are convertible after the date of the consummation of this
offering and prior to the earlier to occur of (i) January 1, 2000 and (ii)
thirty days following the consummation date of this offering into an aggregate
of ____________ shares of Series R Preferred Stock, at a conversion price of
$2.00 per share.

      As long as any of the foregoing warrants or convertible promissory notes
remain unexercised and outstanding, the holders thereof will have the
opportunity to profit from an increase in the market price of the common stock,
if any, without assuming the risk of ownership.


Registration Rights

      We have granted to one investor certain demand and "piggyback" rights to
register shares of common stock currently owned or in the future acquired by
such investor pursuant to a stock purchase agreement between us and such
investor. The investor has waived these registration rights with respect to this
offering.


      We have granted to holders of warrants and convertible notes issued in
connection with a credit facility and note purchase agreement certain demand
registration rights covering the shares of Series R Preferred Stock underlying
these warrants and notes. We are required under these registration rights to
file a registration statement to register the shares no later than 30 days after
the effective date of this offering.


Anti-Takeover Effects of Provisions of Certificate of  Incorporation and Bylaws

      Shaman is subject to the provisions of Section 203 of the Delaware General
Corporation Law statute. Section 203 prohibits a publicly held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years after the person becomes an interested
stockholder, unless the business combination is approved in a prescribed manner.
A "business combination" includes mergers, asset sales and other transactions
resulting in a financial benefit to the interested stockholder. Subject to
certain exceptions, an "interested stockholder" is a person who, together with
affiliates and associates, owns, or within three years did own, 15% or more of
the corporation's voting stock.

      Our Certificate of Incorporation divides the board of directors into two
classes with staggered two-year terms. Under our by-laws, any vacancy on the
board of directors, including a vacancy resulting from an enlargement of the
board of directors, may be filled by a majority of the directors then in office.
The classification of the board of directors and the limitation on filling of


                                       60
<PAGE>

vacancies could make it more difficult for a third party to acquire, or
discourage a third party from acquiring, control of Shaman.

Transfer Agent and Registrar


      BankBoston, N.A. is the transfer agent and registrar for our Series R
Preferred Stock and common stock.


                                       61
<PAGE>


                        SHARES ELIGIBLE FOR FUTURE SALE

      Future sales of substantial amounts of common stock in the public market
could adversely affect the market price of our common stock. In addition, an
active public market for our common stock may not continue in the future.


      Upon completion of this offering, there will be approximately
____________________ shares of common stock outstanding, _________________
shares of common stock issuable upon conversion of outstanding shares of Series
D Preferred Stock (assuming a conversion price, which is based on the common
stock market price, of $_____ per share), and ________________ shares of common
stock issuable upon exercise of outstanding warrants, all of which are freely
tradeable without restriction, except for restrictions imposed on the resale of
shares held by our affiliates, as defined in the Securities Act. An additional
____________ shares of common stock will be issuable upon conversion of the
Series C Preferred Stock (assuming a conversion price, which is based on the
common stock market price, of $_____ per share) commencing on August 18, 1999,
all of which will be freely tradeable without restriction. We will also have up
to 7,500,000 shares of Series R Preferred Stock outstanding and
__________________ shares of Series R Preferred Stock subject to issuance upon
exercise of outstanding warrants. The Series R Preferred Stock is convertible
into common stock on February 1, 2000. On that date, each share of Series R
Preferred Stock will automatically convert into a number of shares of common
stock equal to $2.00 divided by the lower of (i) $_______, or (ii) a per share
price that is equal to 10% of the average closing sales price of our common
stock for the 10 trading days ending three trading days prior to February 1,
2000. Assuming a conversion price of $____________ per share, upon conversion of
the Series R Preferred Stock on February 1, 2000, ________________ shares of
common stock will be issued, or issuable pursuant to warrants, that will be
immediately freely tradeable without restriction, other than by our affiliates.


                                       62
<PAGE>


                               THE RIGHTS OFFERING

The Subscription Rights

      We are offering our stockholders the right to subscribe for and purchase
up to 7,500,000 shares of Series R Convertible Preferred Stock at $2.00 per
share. The rights offering is open only to those stockholders who owned common
stock on [________________, 1999]. The rights offering is not open to anyone who
did not own common stock on [_____________, 1999].


      We are offering stockholders the opportunity to purchase _______ shares of
Series R Preferred Stock for each share of common stock they owned on
[_______________,1999]. In determining the number of shares of Series R
Convertible Preferred Stock we will issue to each stockholder pursuant to the
subscription rights offered by this prospectus, we will round up to the nearest
whole number. We will not issue subscription rights to purchase fractional
shares and we will not pay cash in place of subscription rights.


Basic Subscription Privilege


      Each subscription right entitles you to purchase _____ shares of Series R
Preferred Stock for each share of common stock you owned at the close of
business on [___________, 1999]. You will receive certificates representing the
shares that you purchase pursuant to your basic subscription privilege as soon
as practicable after your basic subscription has been accepted, which may occur
at any time prior to the expiration of this offering. We may accept your basic
subscription amount prior to accepting your over-subscription amount. In that
event, we will deliver stock certificates for the basic subscription amount and
the subscription agent will retain the over-subscription amount in escrow until
the expiration of this offering, as provided below.


Over-Subscription Privilege


      Each subscription right also grants you an over-subscription privilege to
purchase additional shares of Series R Preferred Stock that are not purchased by
other stockholders. You are entitled to exercise your over-subscription
privilege only if you exercise your basic subscription privilege in full. If you
wish to exercise your over-subscription privilege, you should indicate the
number of additional shares that you would like to purchase in the space
provided on your subscription agreement. When you send in your subscription
agreement, you must also send the full purchase price for the number of
additional shares that you have requested to purchase in addition to the payment
due for shares purchased through your basic subscription privilege. If the
number of shares remaining after the exercise of all basic subscription
privileges is not sufficient to satisfy all over-subscription privileges, you
will be allocated shares pro rata, subject to elimination of fractional shares,
in proportion to the number of shares you offer to purchase above your basic
subscription privilege. However, if your pro rata allocation exceeds the number
of shares you requested on your subscription certificate, then you will receive
only the number of shares that you requested, and the remaining shares from your
pro rata allocation will be divided among other stockholders exercising their
over-subscription privileges. In addition, we have the discretion to issue less
than the total number of shares that may be available for over-subscription
requests.

      As soon as practicable after July _____, 1999, BankBoston, N.A., the
subscription agent, will determine the number of shares of Series R Preferred
Stock that you may purchase pursuant to the over-subscription privilege. You
will receive certificates representing these shares as soon as practicable after
the expiration date. If you request and pay for more shares than are allocated
to you, we will refund that overpayment, without interest to you. In connection
with the exercise of the over-subscription privilege, banks, brokers and other
nominee holders of subscription rights who act on behalf of beneficial owners
will be required to certify to the subscription agent and us as to the aggregate
number of subscription rights that have been exercised, and the number of shares
of Series R Preferred Stock that are being requested through the
over-subscription privilege, by each beneficial owner on whose behalf such
nominee holder is acting.


Minimum Subscription Requirement

      We require a minimum subscription of 50 shares of Series R Preferred
Stock, or $100. This means that if you hold fewer than ____ shares of common
stock on the record date, you will be allowed to purchase 50 shares of Series R
Preferred Stock, which will be considered your basic subscription privilege.

                                       63
<PAGE>

Plan of Distribution


      On or about _____________, 1999, we will distribute the subscription
rights agreements and copies of this prospectus to individuals who owned shares
of our common stock on ____________, 1999. If you wish to exercise your
subscription rights and purchase shares of Series R Preferred Stock, you should
complete the subscription agreement and return it, with payment for the shares,
to the subscription agent, BankBoston, N.A. If you have any questions, you
should contact our information agent, Shareholder Communications Corporation, at
the telephone number and address on page ___. See "The Rights Offering --
Subscription Procedures."


      We have retained our transfer agent, BankBoston, N.A., to assist with the
rights offering in the role of the subscription agent. The subscription agent
will hold all subscription agreements received from stockholders, and will be
responsible for delivering stock certificates and refunds, in case of
over-subscription or cancellation of the offering, to stockholders. We will pay
all fees and expenses of the subscription agent in connection with the rights
offering, which we estimate will be approximately $______. You are responsible
for paying any other commissions, fees, taxes or other expenses incurred in
connection with the exercise of the subscription rights.

Expiration Date

      The rights offering will expire at 5:00 p.m., Eastern Daylight Savings
Time, on July __, 1999, unless extended in the sole discretion of Shaman. IF YOU
DO NOT EXERCISE YOUR BASIC SUBSCRIPTION PRIVILEGE OR OVER-SUBSCRIPTION PRIVILEGE
PRIOR TO SUCH TIME, WE HAVE THE RIGHT TO REJECT YOUR SUBSCRIPTION.

      We reserve the right to reject any subscription agreements that the
subscription agent receives after 5:00 p.m. on the expiration date, regardless
of when the documents were originally mailed. Stockholders who wish to
participate in the rights offering should submit all subscription agreements to
BankBoston, N.A. by the expiration date, or to their broker or bank at least 10
days before the expiration date, to allow the broker or bank sufficient time to
carry out those instructions.

      The rights offering is not conditioned upon our receipt of subscriptions
for any minimum number of shares. However, the rights offering may be cancelled
at any time prior to its completion, in which case all subscription payments
will be returned without interest.

 Subscription Payments

      Each subscription agreement submitted pursuant to this rights offering
must be accompanied by the full amount of the purchase price for all of the
shares of Series R Preferred Stock subscribed for by the stockholder. If a
stockholder submits less than the full purchase price, we will limit such
stockholder's maximum subscription to the number of shares purchasable with
those funds, rounded down to the nearest whole number of shares.

      If a subscription is rejected in whole or in part, the subscription agent
will promptly refund payment for any unpurchased shares. We will not pay
interest on any subscription funds.

Determination of Offering Price


      Our board of directors intend to obtain, prior to the effective date of
this offering, an opinion from Alliant Partners that the terms of this rights
offering are fair, from a financial point of view, to our stockholders. The
price at which the Series R Preferred Stock will convert into common stock was
set at a substantial discount to the actual trading price of our common stock.
This discount is offered as an incentive for our current stockholders to
participate in this offering. Nevertheless, the offering price does not
necessarily bear any relationship to the book value of our assets, past
operations, cash flow, earnings, financial condition or any other established
criteria for value and should not be considered an indication of our underlying
value.


Subscription Procedures

      To participate in the rights offering, you must submit a properly
completed subscription agreement, together with full payment of the offering
price for all shares for which you subscribe. Those who hold common stock for
the account of others, such as brokers, banks, trustees or depositories, should
notify the beneficial owners of those shares as soon as possible to ascertain
the beneficial owners' intentions and to obtain instructions with respect to the
rights offering.

                                       64
<PAGE>

      The subscription agreement and payment must be received by the
subscription agent before 5:00 p.m., Eastern Daylight Savings Time, on July ___,
1999, unless extended in our sole discretion. Payment of the offering price must
be made:

      - by check or bank draft drawn upon a U.S. bank or postal, telegraphic,
        or express money order payable to "BankBoston, N.A., as Subscription
        Agent;"

      - by wire transfer of same day funds to the account maintained by the
        subscription agent for such purpose; or

      - by notice of guaranteed delivery of payment from a bank, a trust company
        or a New York Stock Exchange member.

      - in certain circumstances if approved by Shaman in its sole discretion,
        by cancellation of debt evidenced by the cancellation of a promissory
        note or, if applicable, the written acknowledgement and agreement of the
        purchaser that the applicable debt has been paid in the amount of the
        purchase price for the Series R Preferred Stock purchased.


      Payment of the offering price will be deemed made only upon (1) the
subscription agent's receipt of a certified check or bank draft drawn upon a
U.S. bank or any postal, telegraphic or express money order, (2) the clearance
of any uncertified check, (3) the receipt of good funds in the wire transfer
account maintained by the subscription agent, or (4) the subscription agent's
receipt of the cancelled promissory note or other written acknowledgement and
agreement regarding the cancellation of debt. If you wish to pay by uncertified
personal check, please note that your check may take five business days or more
to clear and, therefore, you should make payment sufficiently in advance of the
expiration date to ensure that payment is received and cleared by the expiration
date.


      Subscription agreements and any checks in payment of the offering price
should be delivered by mail, hand delivery, or overnight courier, to:

               BankBoston, N.A.
               40 Campanelli Drive
               Braintree, Massachusetts 02184


         The wire transfer instructions for the account maintained by the
subscription agent for this offering are as follows:

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




      If you wish to purchase shares by cancellation of debt, you should contact
our information agent, Shareholder Communications Corporation at 1-800-546-8622.
The information agent will arrange to have Shaman contact you to discuss the
procedures for purchasing shares by paying the purchase price with cancellation
of debt.


      If you do not indicate the number of shares to be purchased or do not
forward full payment of the offering price, then you will be deemed to have
exercised the basic subscription privilege to the full extent of the payment
received and, if any funds remain, will be deemed to have exercised the
over-subscription privilege to the extent of the remaining funds. In each case,
share amounts will be rounded down to the nearest whole number.

      The method of delivery of the subscription agreement and payment of the
offering price will be at your election and risk. If sent by mail, it is
recommended that your subscription agreement and payment be sent by registered
mail, properly insured, with return receipt requested, and that a sufficient
number of days be allowed to ensure delivery to the subscription agent and
clearance of payment prior to the expiration date. Because uncertified personal
checks may take at least five business days to clear, you are urged to arrange
for payment by certified or cashier's check, money order or wire transfer of
funds.

      Our answers to all questions concerning the timeliness, validity, form and
eligibility of any subscription will be final and binding. We may, in our sole
discretion, waive any defect or irregularity, permit a defect or irregularity to
be corrected within any time as we may determine, or reject the purported
exercise of any right. Subscriptions will not be deemed to have been received or
accepted until all irregularities have been waived or cured within the time that
we determine in our discretion. Neither we nor the subscription agent will be
under any duty to notify you of any defect or irregularity in connection with
the submission of your subscription agreement or incur any liability for failure
to give notification.

                                       65
<PAGE>


      If you have any questions concerning the rights offering or these
subscription procedures, or if you would like additional copies of this
prospectus or other documents, please contact our information agent: Shareholder
Communications Corporation, 17 State Street, New York, NY 10004. Banks and
brokers may call the information agent at (212) 805-7113, and stockholders may
call toll free at (800) 546-8622.


Non-Transferability of Subscription Rights

      Only you may exercise the basic subscription privilege and the
over-subscription privilege. You may not sell, give away or otherwise transfer
the basic subscription privilege or the over-subscription privilege.

No Revocation of Subscription

      After you have exercised your basic subscription privilege or
over-subscription privilege, you may not revoke that exercise. You should not
exercise your subscription rights unless you are certain that you wish to
purchase shares of our Series R Convertible Preferred Stock.

Amendment and Termination of Rights Offering

      We reserve the right to amend the terms and conditions of the rights
offering. If we make an amendment that we consider significant, we will (1) mail
notice of the amendment to all stockholders who owned shares of common stock on
___________, 1999, (2) extend the expiration date by at least 14 days and (3)
offer all subscribers not less than 10 days to revoke any prior subscriptions,
in whole or in part. In all other cases, subscriptions will be irrevocable.

      We also reserve the right to terminate the rights offering at any time, in
our discretion, in which case all subscriptions will be cancelled, and we will
return all subscription payments to subscribers without interest.

      Upon the occurrence of any change in or cancellation of the rights
offering, we will issue a press release to that effect, and we will file a
post-effective amendment to the registration statement covering this prospectus.

Shares of Common Stock Outstanding After the Rights Offering


      Assuming we issue all of the shares of Series R Preferred Stock offered in
the rights offering and assuming conversion of all of such shares at a
conversion price of $____ per share, approximately ____ shares of common stock
will be issued and outstanding following the rights offering and conversion of
the Series R Preferred Stock. This would represent a __% increase in the number
of outstanding shares of our common stock. If you do not exercise your basic
subscription privilege, the percentage of Shaman common stock that you hold will
substantially decrease.


Certain Ownership Limits and Reporting Requirements

      Any person or group that acquires direct or indirect beneficial ownership
of more than 5% of the outstanding shares of our common stock will be subject to
special reporting requirements under Section 13(d) or 13(g) of the Securities
Exchange Act of 1934. Any person or group that acquires direct or indirect
beneficial ownership of more than 10% of the outstanding shares of our common
stock will be subject to special reporting requirements under Section 16(a) of
the Exchange Act and may become liable under Section 16(b) of the Exchange Act
for reimbursement of any "short-swing profits." Please consult with your
attorney to see if these rules will apply to you.

State and Foreign Securities Laws

      The rights offering is not being made in any state or foreign country in
which it is unlawful to do so, nor are we selling or accepting subscriptions
from holders who are residents of any such state or country. We may delay the
commencement of the rights offering in certain states or other jurisdictions in
order to comply with the securities law requirements of those states or other
jurisdictions. It is not anticipated that there will be any changes in the terms
of the rights offering. We may decline, in our sole discretion, to make
modifications to the terms of the rights offering requested by certain states or
other jurisdictions, in which case stockholders who live in those states or
jurisdictions will not be eligible to participate in the rights offering.

                                       66
<PAGE>

No Recommendations

      We are not making any recommendation as to whether or not you should
exercise your subscription rights. You should make your decision based on your
own assessment of your best interests.


                        FEDERAL INCOME TAX CONSIDERATIONS

      The following summarizes the material federal income tax consequences of
the rights offering. This summary is based on current law, which is subject to
change at any time, possibly with retroactive effect. This summary is not a
complete discussion of all federal income tax consequences of the rights
offering, and, in particular, may not address federal income tax consequences
applicable to stockholders subject to special treatment under federal income tax
law. In addition, this summary does not address the tax consequences of the
rights offering under applicable state, local or foreign tax laws. This
discussion assumes that your shares of Shaman stock and the subscription rights
and shares issued to you pursuant to the rights offering constitute capital
assets.

      Receipt and exercise of the subscription rights distributed pursuant to
the rights offering is intended to be nontaxable to stockholders, and the
following summary assumes you will qualify for such nontaxable treatment. We
have not sought, nor do we intend to seek, any ruling from the IRS or an opinion
of counsel related to the tax matters described below.

      This discussion is included for your general information only. You should
consult your tax advisor to determine the tax consequences to you of the rights
offering in light of your particular circumstances, including any state, local
and foreign tax consequences.

Taxation of Stockholders

      Receipt of a subscription right: You will not recognize any gain or other
income upon receipt of a subscription right.

      Tax basis of subscription rights: Your tax basis in each subscription
right will depend on whether you exercise the subscription right or allow the
subscription right to expire.

      If you exercise a subscription right, your tax basis in the subscription
right will be determined by allocating the tax basis of your Shaman stock on
which the subscription right is distributed between the Shaman stock and the
subscription right, in proportion to their relative fair market values on the
date of distribution of the subscription right. However, if the fair market
value of your subscription rights is less than 15% of the fair market value of
your existing shares of Shaman stock, then the tax basis of each subscription
right will be deemed to be zero, unless you elect, by attaching an election
statement to your federal income tax return for 1999, to allocate tax basis to
your subscription rights.

      If you allow a subscription right to expire, it will be treated as having
no tax basis.

      Holding period of subscription rights: Your holding period for a
subscription right will include your holding period for the shares of common
stock upon which the subscription right is issued.

      Expiration of subscription rights: You will not recognize any loss upon
the expiration of a subscription right.

      Exercise of subscription rights: You generally will not recognize a gain
or loss on the exercise of a subscription right. The tax basis of any share of
Series R Preferred Stock that you purchase through the rights offering will be
equal to the sum of your tax basis, if any, in the subscription right exercised
and the price paid for the share. The holding period of the shares of Series R
Preferred Stock purchased through the rights offering will begin on the date
that you exercise your subscription rights.

      If treated as a taxable distribution: If, contrary to Shaman's intent, the
rights offering does not qualify as nontaxable, you would be treated as
receiving a taxable distribution equal to the fair market value of the
subscription rights on their distribution date. The distribution would be taxed
as a dividend to the extent made out of our current or accumulated earnings and
profits; and any excess would be treated first as a return of your basis
(investment) in your Shaman stock and then as a capital gain. You would have a
tax basis in the rights equal to the fair market value of the rights on the date
of the rights distribution and your holding period in the rights would begin on
the date of distribution of the rights. Expiration of the subscription rights
would result in a capital loss. You generally will not recognize gain or loss on
the exercise of a subscription right. The tax basis of any share of common stock
that you purchase through the rights offering will be equal to the sum of your


                                       67
<PAGE>

tax basis, if any, in the subscription right exercised and the price paid for
the share. The holding period of the shares of common stock purchased through
the rights offering will begin on the date that you exercise your subscription
rights.

      Conversion of Series R Preferred Stock to Common Stock: There is some risk
that the Internal Revenue Service would argue that the conversion of the Series
R Preferred Stock to common stock is properly characterized as a taxable stock
dividend rather than a nontaxable event. If the conversion were treated as a
taxable stock dividend, the Internal Revenue Service may argue that the amount
of the dividend is equal to the amount of the discount from the stated trading
price of the common stock on which the conversion is based. Because the Series R
Preferred Stock will convert automatically and in the full to common stock, and
because the Series R Preferred Stock will not have any dividend arrearages as of
the time the conversion occurs, Shaman anticipates that the conversion of the
Series R Preferred Stock will qualify as a nontaxable event. If the conversion
qualifies as a nontaxable event, your tax basis in your Series R Preferred Stock
will be allocated among the shares of common stock you receive upon conversion,
and the holding period of the shares of common stock will include your holding
period you had in the Series R Preferred Stock prior to conversion.

Taxation of Shaman

      We will not recognize any gain, other income or loss upon the issuance of
the subscription rights, the lapse of the subscription rights, or the receipt of
payment for shares of Series R Preferred Stock upon exercise of the subscription
rights.

LEGAL MATTERS

      Brobeck, Phleger & Harrison LLP will deliver an opinion to us about the
validity of the issuance of the shares of our Series R Preferred Stock.


EXPERTS


     Ernst &  Young  LLP, independent auditors, have audited our financial
statements at December 31, 1998 and 1999 and for each of the three years in the
period ended December 31, 1998, as set forth in their report (which contains an
explanatory paragraph describing conditions that raise substantial doubt about
our ability to continue as a going concern as described in Note 1 to the
financial statements), which is included in this prospectus and in the
registration statement. Our financial statements are included in reliance on
Ernst & Young LLP's report, given on their authority as experts in accounting
and auditing.


                                       68
<PAGE>


                           SHAMAN PHARMACEUTICALS, INC
                          INDEX TO FINANCIAL STATEMENTS



Report of Independent Auditors..............................................F-2

Balance Sheets as of December 31, 1997 and 1998 and March 31, 1999
  (unaudited)...............................................................F-3

Statements of Operations for the years ended December 31, 1996, 1997,
  and 1998 and the three months ended March 31, 1998 and 1999 (unaudited)...F-4

Statements of Stockholders' Equity for the years ended December 31, 1996,
  1997, 1998 and the three months ended March 31, 1999 (unaudited)..........F-5

Statements of Cash Flows for the years ended December 31, 1996, 1997,
  1998 and the three months ended March 31, 1998 and 1999 (unaudited).......F-7

Notes to Financial Statements...............................................F-8


                                       F-1
<PAGE>



               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders of
Shaman Pharmaceuticals, Inc.

      We have audited the accompanying balance sheets of Shaman Pharmaceuticals,
Inc. as of December 31, 1998 and 1997, and the related statements of operations,
stockholders' equity, and cash flows for each of the three years in the period
ended December 31, 1998. 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 audits.

      We conducted our audits 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 audits provide 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 Shaman Pharmaceuticals, Inc.
at December 31, 1998 and 1997, and the results of our operations and our cash
flows for each of the three years in the period ended December 31, 1998, 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 more fully described in Note 1, the
Company had cash, cash equivalents and short-term investments at December 31,
1998 aggregating $9.2 million which are not sufficient to enable the Company to
pay its existing liabilities and to fund its operations through December 31,
1999. The Company has incurred recurring operating losses and has total
liabilities at December 31, 1998 in excess of its available cash resources.
These conditions raise 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 1. The financial statements referred to above do not include
any adjustments to reflect the possible future effects on the recoverability and
classification of assets or the amounts and classification of liabilities that
may result from the outcome of this uncertainty.



Palo Alto, California
February 11, 1999, except for Note 10, as to which  the date is June ___, 1999
- --------------------------------------------------------------------------------

      The foregoing report is in the form that will be signed upon the
completion of the one-for-twenty reverse stock split described in Note 10 to the
financial statements.

                                ERNST & YOUNG LLP




Palo Alto, California
June ___, 1999



                                       F-2
<PAGE>


<TABLE>

<CAPTION>
                                    SHAMAN PHARMACEUTICALS, INC.

                                          BALANCE SHEETS


                                                                      December 31,             March 31,
                                                            ----------------------------    -------------
                                                               1997             1998             1999
                                                            -----------      -----------    -------------
                         ASSETS                                                              (unaudited)
<S>                                                         <C>               <C>           <C>

Current assets:
  Cash and cash equivalents                              $   11,340,702    $   5,887,496    $   1,706,936
  Short-term investments                                     10,079,943        3,277,197        1,003,671
  Amounts due from related parties                              192,551          208,898          200,276
  Prepaid expenses and other current assets                     553,507          283,804          658,488
                                                            -----------      -----------      -----------
         Total current assets                                22,166,703        9,657,395        3,569,371

  Property and equipment:
     Laboratory equipment                                     6,211,182        6,336,564        1,118,110
     Computer equipment and furniture                         1,158,869        1,474,914          367,332
     Leasehold improvements                                   7,351,827        7,266,066        7,179,564
                                                            -----------      -----------      -----------
                                                             14,721,878       15,077,544        8,665,006
     Less: accumulated depreciation and amortization        (10,749,738)     (11,963,876)       6,279,270
                                                            -----------      -----------      -----------
                                                              3,972,140        3,113,668        2,385,736
   Other assets                                                 613,657          368,080          368,080
                                                            -----------      -----------      -----------
         Total assets                                     $  26,752,500    $  13,139,143    $   6,323,187
                                                          =============    =============    =============


               LIABILITIES AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)

Current liabilities:
  Accounts payable and other accrued expenses             $     925,701    $   1,515,230    $   1,309,352
  Accrued clinical trial costs                                1,689,659        2,051,134        1,087,786
  Accrued professional fees                                     718,625          948,374          896,700
  Accrued compensation                                          368,272          326,797          225,089
  Accrued restructuring costs                                         -                -        1,715,132
  Advances--contract research                                 1,133,605          968,750          968,750
  Current installments of long-term obligations               2,783,976        2,803,861        2,897,494
                                                            -----------      -----------      -----------
         Total current liabilities                            7,619,838        8,614,146        9,100,303

Long-term obligations, excluding current installments         4,017,979        2,415,137        1,389,651
Senior convertible notes                                      9,967,044                -                -
Stockholders' equity:
  Preferred stock, $0.001 par value; issuable in
    series; 1,000,000 shares and 2,000,000 shares
    authorized at December 31, 1998 and March 31, 1999,
    respectively; 400,000, 519,533 and 518,033
    convertible shares issued and outstanding at December
    31, 1997, 1998 and March 31, 1999, respectively
    (Liquidation preference at December 31, 1997,
    1998 and March 31, 1999 -- $3,258,800, 18,429,310
    and 16,929,310, respectively)                                   400              520              518
  Common stock, $0.001 par value; 40,000,000 shares
    and 70,000,000 authorized at December 31, 1998 and
    March 31, 1999, respectively; 889,802 shares,
    1,519,147 shares and 1,929,358 shares issued and
    outstanding at December 31, 1997, 1998 and
    March 31, 1999, respectively                                    890            1,519            1,929
  Additional paid-in capital                                117,181,430      152,727,444      154,990,316
  Deferred compensation and other adjustments                  (124,910)        (185,850)        (116,086)
  Accumulated deficit                                      (111,910,171)    (150,433,773)    (159,043,444)
                                                           ------------     ------------     ------------
          Total stockholders' equity
               (net capital deficiency)                       5,147,639        2,109,860       (4,166,767)
                                                          -------------    -------------     ------------
          Total liabilities and stockholders' equity      $  26,752,500    $  13,139,143    $   6,323,187
               (net capital deficiency)                   =============    =============    =============

</TABLE>

               See accompanying notes to financial statements.




                                      F-3
<PAGE>


<TABLE>

<CAPTION>
                                            SHAMAN PHARMACEUTICALS, INC.

                                             STATEMENTS OF OPERATIONS


                                                Years Ended December 31,                 Three Months Ended March 31,
                                     -----------------------------------------------    ------------------------------
                                         1996              1997             1998            1998             1999
                                     -------------    -------------    -------------    -------------    -------------
<S>                                   <C>              <C>              <C>             <C>              <C>
Revenue from collaborative
  agreements                          $  3,406,250     $  3,500,000     $  2,659,856     $    875,000     $          -
Operating expenses:
  Research and development              19,138,190       24,140,246       32,393,374        7,513,098        2,468,118
  General and administrative             3,537,157        4,833,489        5,565,066        1,276,111        1,493,785
  Restruturing costs                             -                -                -                -        2,188,857
                                     -------------    -------------    -------------    -------------    -------------
     Total operating expenses           22,675,347       28,973,735       37,958,440        8,789,209        6,150,760
                                     -------------    -------------    -------------    -------------    -------------
Loss from operations                   (19,269,097)     (25,473,735)     (35,298,584)      (7,914,209)      (6,150,760)
Interest income                          1,082,618        1,217,884          550,227          232,368           73,878
Interest expense                          (603,330)      (5,032,684)      (2,033,004)        (806,896)        (259,175)
                                     -------------    -------------    -------------    -------------    -------------
Net loss                               (18,789,809)     (29,288,535)     (36,781,361)      (8,488,737)      (6,336,057)
Deemed dividend on Preferred Stock               -                -       (1,742,241)               -       (2,273,614)
                                     -------------    -------------    -------------    -------------    -------------
Net loss applicable to
  Common Stockholders                 $(18,789,809)    $(29,288,535)    $(38,523,602)    $ (8,488,737)    $ (8,609,671)
                                      ============     ============    =============    =============    =============
Basic and diluted net loss per
  common share                        $     (27.85)    $     (34.44)    $     (38.31)    $      (9.52)    $      (5.18)
                                      ============     ============     =============   =============    =============
Shares used in calculation of
  basic and diluted net loss
  per common share                         674,800          850,500        1,005,700          891,800        1,662,750
                                      ============     ============    =============    =============    =============

</TABLE>

               See accompanying notes to financial statements.



                                      F-4
<PAGE>

<TABLE>
<CAPTION>
                                             SHAMAN PHARMACEUTICALS, INC.


                                          STATEMENTS OF STOCKHOLDERS' EQUITY
                                   For the Years Ended December 31, 1996, 1997, and 1998
                                     and the Quarter Ended March 31, 1999 (unaudited)



                                                                                   Deferred
                              Convertible                        Additional      Compensation                           Total
                               Preferred         Common           Paid-In         and Other         Accumulated      Stockholders'
                                 Stock            Stock           Capital        Adjustments          Deficit           Equity
                              ------------     -----------     -------------    -------------     --------------    --------------
<S>                           <C>             <C>               <C>             <C>              <C>               <C>
Balance at December 31, 1995    $       -      $       663     $  88,183,521    $   (146,956)     $ (63,831,827)    $  24,205,401
Issuance of 13,699 shares
  of common stock upon
  the exercise of stock options         -               14           440,066               -                  -           440,080
Issuance of 400,000 shares
  of series A convertible
  preferred stock                     400                -         3,057,823               -                  -         3,058,223
Issuance of
  19,446 shares of common
  stock in connection with
  Lipha/Merck collaboration             -               19         2,972,203               -                  -         2,972,222
Unrealized loss on
  available-for-sale securities         -                -                 -         (26,458)                 -           (26,458)
Amortization and reversals of
  deferred compensation                 -                -           (35,933)        153,164                  -           117,231
Net loss                                -                -                 -               -        (18,789,809)      (18,789,809)
                               ----------       ----------      ------------    ------------       ------------      ------------
Balance at December 31, 1996          400              696        94,617,680         (20,250)       (82,621,636)       11,976,890
Issuance of 974 shares
  of common stock upon
  the exercise of stock options         -                1            64,155               -                  -            64,156
Issuance of 100,000 shares
  of common stock in connection
  with a registered direct public
  offering in January 1997, net
  of issuance costs of $.93 million     -              100         8,070,310               -                  -         8,070,410
Issuance of 80,000 shares
  of common stock in connection
  with a registered direct public
  offering in April 1997, net
  of issuance costs of $.13 million     -               80         7,824,174               -                  -         7,824,254
Issuance of 10,039 shares
  of common stock in connection
  with Lipha/Merck collaboration        -               10         1,492,529               -                  -         1,492,539
Issuance of 2,755 shares
  of common stock upon conversion
  of senior convertible notes in
  November 1997                         -                3           223,160               -                  -           223,163
Unrealized loss on
  available-for-sale securities         -                -                 -          (9,720)                 -            (9,720)
Deferred compensation related
  to granting of options to
  non-employees, net of
  amortization and reversals            -                -           240,282         (94,940)                 -           145,342
Value ascribed to warrants issued
  in conjunction with secured loan      -                -           648,000               -                  -           648,000
Value ascribed to in-the-money
  conversion option of senior
  convertible notes                     -                -         3,692,140               -                  -         3,692,140
Value ascribed to warrants issued
  in conjunction with senior
  convertible notes                     -                -           309,000               -                  -           309,000
Net loss                                -                -                 -               -        (29,288,535)      (29,288,535)
                               ----------       ----------      ------------    ------------      -------------      ------------
Balance at December 31, 1997    $     400        $     890      $117,181,430    $   (124,910)     $(111,910,171)      $ 5,147,639

</TABLE>



                                      F-5
<PAGE>

<TABLE>
<CAPTION>
                                             SHAMAN PHARMACEUTICALS, INC.


                                   STATEMENTS OF STOCKHOLDERS' EQUITY (continued)
                               For the Years Ended December 31, 1996, 1997, and 1998
                                and the Quarter Ended March 31, 1999 (unaudited)


                                                                                   Deferred
                              Convertible                        Additional      Compensation                           Total
                               Preferred         Common           Paid-In         and Other         Accumulated      Stockholders'
                                 Stock            Stock           Capital        Adjustments          Deficit           Equity
                              ------------     -----------     -------------    -------------     --------------    --------------
<S>                           <C>             <C>            <C>             <C>              <C>            <C>
Balance at December 31, 1997    $     400        $     890      $117,181,430    $   (124,910)     $(111,910,171)      $ 5,147,639
Issuance of 792 shares
  of common stock upon the
  exercise of stock options             -                1            21,714               -                  -            21,715
Issuance of 3,116 shares
  of common stock to employees
  from the 1998 special
  issuance plan                         -                3            80,756               -                  -            80,759
Issuance of  37,360 shares
  of common stock to consultants
  for consulting services rendered      -               37         1,074,073               -                  -         1,074,110
Sale of 57,762 shares
  of common stock in connection
  with Lipha/Merck collaboration        -               58         2,499,942               -                  -         2,500,000
Deferred compensation related to
  granting of options to
  non-employees,  net of
  amortization  and reversals           -                -           162,464         (75,849)                 -            86,615
Change in unrealized gain/loss
  on available-for-sale securities      -                -                 -          14,909                  -            14,909
Value ascribed to Warrants issued
  in conjunction with Series B
  Convertible Preferred Stock
  ($1,462,860)                          -                -                 -               -                  -                 -
Issuance of 10,082 shares
  of common stock in connection
  with senior convertible notes
  quarterly interest payment            -               10           650,531               -                  -           650,541
Issuance of 53,810 shares
  of common stock upon the
  conversion of 1,209 shares
  of Series D Convertible
  Preferred Stock                      (1)              54               (53)              -                  -                 -
Issuance of 128,563 shares
  of common stock upon the
  conversion of senior
  convertible notes                     -              129         5,453,055               -                  -         5,453,184
Sale of 140,880 shares
  of convertible preferred stock
  in connection with the Series C
  Convertible Preferred Stock
  Offering, net of issuance
  costs of $1.5 million               141                -        12,598,553               -                  -        12,598,694
Value ascribed to in-the-money
  conversion option of Series C
  Convertible Preferred Stock           -                -           678,636               -                  -           678,636
Issuance of 93,077 shares
  of common stock upon the
  conversion of 24,922 shares
  of Series C Convertible
  Preferred Stock                     (25)              93               (68)              -                  -                 -
Issuance of 4,179 shares
  of common stock in
  payment of Dividends on
  Series C Convertible
  Preferred Stock                       -                4                (4)              -                  -                 -
Sale of 240,604 shares
  of common stock in connection
  with the private placement
  offering in December 1998,
  net of issuance costs of
  $.13 million                          -              240         7,086,704               -                  -         7,086,944
Issuance of 4,784 shares
  of Series D Convertible
  Preferred Stock in exchange
  for cancellation of senior
  convertible note                      5                -         4,176,106               -                  -         4,176,111
Value ascribed to in-the-money
  conversion option of Series D
  Convertible Preferred Stock           -                -         1,063,605               -                  -         1,063,605
Value ascribed to Warrants
  issued in conjunction with
  Series D Convertible
  Preferred Stock ($943,680)            -                -                 -               -                  -                 -
Net loss                                -                -                 -               -        (38,523,602)      (38,523,602)
                               ----------       ----------      ------------    ------------      -------------      ------------
Balance at December 31, 1998          520            1,519       152,727,444        (185,850)      (150,433,773)        2,109,860
Issuance of 8,204,208 shares
  of common stock upon the
  conversion of 1,500 shares
  of Series D Convertible
  Preferred Stock (unaudited)          (2)             410            14,198               -                  -            14,606
Value ascribe to the
  in-the-money conversion option
  of Series D Convertible
  Preferred Stock (unaudited)           -                -         2,273,614               -                  -         2,273,614
Other Preferred Stock
  costs (unaudited)                     -                -           (24,940)              -                  -           (24,940)
Deferred compensation related
  to granting of options to
  non-employees, net of
  amortization and reversals
  (unaudited)                           -                -                 -          54,700                  -            54,700
Change in unrealized gain/loss
  on available-for-sale
  securities (unaudited)                -                -                 -          15,064                  -            15,064
Net loss (unaudited)                    -                -                 -               -         (8,609,671)       (8,609,671)
                               ----------       ----------      ------------    ------------      -------------      ------------
Balance at
 March 31, 1999 (unaudited)     $     518       $    1,929      $154,990,316    $   (116,086)     $(159,043,444)      $(4,166,767)
                               ==========       ==========      ============    ============      =============      ============
</TABLE>
               See accompanying notes to financial statements.



                                      F-6
<PAGE>


<TABLE>

<CAPTION>
                                                   SHAMAN PHARMACEUTICALS, INC.

                                                    STATEMENTS OF CASH FLOWS
                                           Increase (Decrease) in Cash and Cash Equivalents

                                                              Years ended December 31,                Three Months Ended March 31,
                                                -----------------------------------------------      ------------------------------
                                                     1996             1997             1998               1998             1999
                                                --------------    -------------   -------------      -------------    -------------
<S>                                                       <C>               <C>               <C>         <C>            <C>
Operating activities:
  Net loss applicable to
    Common Shareholders                         $ (18,789,809)   $ (29,288,535)   $ (38,523,602)    $  (8,488,737)   $  (8,609,671)
  Adjustments to reconcile net loss to
    net cash used in operating activities:
       Depreciation                                 2,245,860        1,718,167        1,214,139           380,844          170,749
       Amortization of warrants
         and deferred equity costs                    117,231          390,729          286,664           270,068          108,702
       Loss on disposal of fixed assets                     -                -           19,834            26,593          121,696
       Interest expense on issuance of
         senior convertible notes                           -        3,692,140                -                 -                -
       Deemed dividend on preferred stock                   -                -        1,742,241                 -        2,273,614
       Issuance of common stock to
         consultants for services rendered                  -                -        1,074,110                 -                -
       Other compensation                                   -                -           80,759                 -                -
       Payment of interest in common stock                  -                -          328,743           288,563           14,607
  Changes in operating assets and liabilities:
       Prepaid expenses, current assets and
         other assets                                 (80,148)         628,198          755,280          (120,410)         (93,999)
       Accounts payable, accrued professional
         fees, accrued compensation, accrued
         clinical trial costs and contract
         research advances                          2,021,220         (748,327)         974,423           850,384          392,525
                                                 ------------     ------------     ------------      ------------     ------------
Net cash used in operating activities             (14,485,646)     (23,607,628)     (32,047,409)       (6,792,695)      (5,621,777)
                                                 ------------     ------------     ------------      ------------     ------------
Investing activities:
  Purchases of available-for-sale investments     (10,872,811)     (14,562,627)      (5,255,947)       (1,999,049)               -
  Maturities of available-for-sale investments     26,325,454        4,954,640        5,032,892         4,959,136                -
  Sales of available-for-sale investments           1,494,000                -        7,040,710           899,007        2,288,589
  Proceeds from sale of fixed assets due to
     restructuring                                          -                -                -                 -          235,636
  Capital expenditures                               (864,729)        (913,382)        (375,501)          (33,143)         (80,836)
  Employee loans, net of repayments                         -                -         (256,347)                -            8,622
                                                 ------------     ------------     ------------      ------------     ------------
Net cash provided by (used in) investing
   activities                                      16,081,914      (10,521,369)       6,185,807         3,825,951        2,452,011
                                                 ------------     ------------     ------------      ------------     ------------
Financing activities:
  Proceeds from issuance of preferred
     stock, net                                     3,058,223                -       12,598,694                 -                -
  Proceeds from issuance of common
     stock, net                                     3,412,302       17,446,683        9,608,659            12,225                -
  Proceeds from issuance of long-term obligations     600,000        5,000,000                -                 -                -
  Proceeds from issuance of senior
     convertible notes, net                                 -        9,479,039                -                 -                -
  Issuance and other related costs on
     preferred stock                                        -                -                -                 -          (24,941)
  Principal payments on long-term obligations      (1,825,665)      (2,936,297)      (2,310,080)         (643,964)        (985,853)
  Proceeds from asset financing arrangements                -          429,023          511,123           211,232                -
                                                 ------------     ------------     ------------      ------------     ------------
Net cash provided by financing activities           5,244,860       29,418,448       20,408,396          (420,507)      (1,010,794)
                                                 ------------     ------------     ------------      ------------     ------------
Net increase (decrease) in cash and
     cash equivalents                               6,841,128       (4,710,549)      (5,453,206)       (3,387,251)      (4,180,560)
Cash and cash equivalents at beginning
     of period                                      9,210,123       16,051,251       11,340,702        11,340,702        5,887,496
                                                 ------------     ------------     ------------      ------------     ------------
Cash and cash equivalents at end of period       $ 16,051,251     $ 11,340,702     $  5,887,496      $  7,953,451     $  1,706,936
                                                =============    =============     ============      ============     ============
Supplemental information
  Interest paid                                  $    603,330     $    538,891     $    605,069      $    217,056     $    262,266
                                                =============    =============     ============      ============     ============

</TABLE>
               See accompanying notes to financial statements.


                                      F-7
<PAGE>


                          SHAMAN PHARMACEUTICALS, INC.


                          NOTES TO FINANCIAL STATEMENTS
                  (Information pertaining to the periods ended
                     March 31, 1998 and 1999 is unaudited)


1.  Summary of Significant Accounting Policies

General

      To date, Shaman Pharmaceuticals has been primarily focused on discovering
and developing novel pharmaceutical products for major human diseases by
isolating and optimizing active compounds found in tropical plants with a
history of medicinal use. We have conducted human clinical trials with our three
lead product candidates -- SP-303/Provir (Phase III/II), nikkomycin Z (Phase I)
and SP-134101 (Phase I) -- targeting five indications. Due to unforeseen delays
and costs necessary to complete additional necessary trials for our lead
compound, SP-303/Provir for the treatment of diarrhea in people with AIDS, we
have chosen to discontinue all pharmaceutical development, manufacturing and
marketing activities. We intend to sell or out-license worldwide marketing
rights to our pharmaceutical assets. We plan to focus our efforts on our
Botanicals division.

Matters Affecting Ongoing Operations

      The accompanying financial statements have been prepared assuming that we
will continue as a going concern. We have cash, cash equivalents and short-term
investments at December 31, 1998 aggregating $9.2 million which are not
sufficient to enable us to pay existing liabilities and fund our operations
through December 31, 1999. We have total liabilities in excess of our available
cash resources at December 31, 1998. We have had recurring net losses, including
a net loss applicable to common stockholders of $38.5 million in the year ended
December 31, 1998, and have an accumulated deficit of $150.4 million at December
31, 1998. These conditions raise substantial doubt about our ability to continue
as a going concern.


      To address these matters, on February 1, 1999, we announced and initiated
the implementation of a Restructuring Plan which resulted in the immediate
cessation of all pharmaceutical research and development activities, a reduction
in workforce of 60 employees, and will result in the closing down of all of the
operations of our pharmaceutical business (see Note 2). After the implementation
of the Restructuring Plan, we expect our cash resources available at December
31, 1998 to be substantially used before the end of June 1999.


      Further, we intend to sell or enter into outlicensing agreements with
respect to all of our current pharmaceutical research programs including
SP-303/Provir, nikkomycin Z and SP-134101. We are currently negotiating for the
termination of our remaining research and development collaboration agreement
with Lipha S.A., a wholly-owned subsidiary of Merck KGaA, Darmstadt, Germany
("Lipha/Merck"). We intend to focus our future efforts on the development and
commercialization of botanical dietary supplements derived from tropical plant
sources.

Revenue Recognition

      Revenue under our collaborative research agreements is recognized ratably
as costs are incurred by us in accordance with the performance requirements of
the agreements. Non-refundable payments that are not dependent on future
performance under collaborative agreements are recognized as revenue when
received. Payments received which are still subject to future performance
requirements are deferred until earned. Revenues from achievement of milestone
events are recognized when the funding party agrees that the scientific or
clinical results stipulated in the agreement have been met. Costs of contract
revenue approximate such revenue and are included in research and development
expenses.

Research and Development Expense

      Research and development expense consists of independent research and
development costs and the costs associated with work performed under
collaborations. Research and development costs include direct and
research-related overhead expenses and are expensed as incurred.


                                      F-8
<PAGE>

Stock-Based Compensation


      In October 1995, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards, "Accounting for Stock-Based
Compensation" ("SFAS 123") which encourages, but does not require, companies to
record compensation expense for stock-based employee compensation plans at fair
value. We have elected to follow the disclosure requirements of SFAS 123 for the
year ended December 31, 1998, 1997 and 1996 and will continue to measure
stock-based compensation to employees in accordance with APB Opinion No. 25,
"Accounting for Stock Issued to Employees." Note 8 contains a summary of the pro
forma effects to reported net loss applicable to common stockholders and net
loss per common share for 1996, 1997 and 1998 as if we had elected to recognize
compensation expense based on the fair value of options granted as described by
SFAS 123.


      We grant stock options to employees and directors for a fixed number of
shares with an exercise price equal to the fair market value of shares at the
date of grant. We account for stock option grants to employees and directors in
accordance with APB Opinion No. 25, Accounting for Stock Issued to Employees
and, accordingly, recognize no compensation expense for the stock option grants
to employees and directors.

Per Share Data

      Net loss per share is computed using the weighted average number of shares
of common stock outstanding. The impact of stock options and other common stock
equivalents have been excluded from the computation in all years presented as
they are antidilutive.

Comprehensive Loss


      As of January 1, 1998, we adopted Financial Accounting Standards Board
("FASB") Statement No. 130, Reporting Comprehensive Income ("SFAS 130"). SFAS
130 established new rules for the reporting and displaying of comprehensive
income and its components; however, the adoption of this statement had no impact
on our net loss or total stockholders' equity. SFAS 130 requires unrealized
gains or losses on our available for sale securities, which prior to adoption
were reported in stockholder's equity, to be included in other comprehensive
income (loss). Our comprehensive loss was not materially different from our net
loss applicable to common stockholders in 1996, 1997 and 1998.


Cash, Cash Equivalents, Investments and Concentration of Credit Risk

      We consider all highly liquid investments with remaining maturities of
three months or less at time of purchase to be cash equivalents. Investments
with maturities of less than one year from the balance sheet date and with
original maturities greater than 90 days are considered short-term investments.
Investments with maturities greater than one year from the balance sheet date
are considered long-term investments. Investments consist primarily of
commercial paper, investments in government securities, corporate bonds and
asset-backed securities. These investments typically bear minimal risk. This
diversification of risk is consistent with our policy to maintain high liquidity
and ensure safety of principal. We maintain our cash, cash equivalents and
investments in accounts with several United States banks and brokerage houses.


      We determine the appropriate classification of debt securities at the time
of purchase and re-evaluate such determination as of each balance sheet date. As
of December 31, 1997 and 1998, we have classified our entire investment
portfolio as available-for-sale. Available-for-sale securities are carried at
fair value, with the unrealized gains and losses, net of tax, included in other
comprehensive income. The amortized cost of debt securities in this category is
adjusted for amortization of premiums and accretion of discounts to maturity.
Such amortization is included in interest income. Realized gains and losses and
declines in value judged to be other-than-temporary on available-for-sale
securities are included in interest income or expense. The cost of securities
sold is based on the specific identification method. Interest and dividends on
securities classified as available-for-sale are included in interest income.


Property and Equipment

      Property and equipment are stated at cost. Depreciation of equipment and
furniture is provided on a straight-line basis over the estimated useful lives
of the respective assets, which range from three (computer equipment and
furniture) to five (laboratory equipment) years. Equipment held under capital
leases is amortized using the straight-line method over the shorter of the lease
term or estimated useful life of the asset. Leasehold improvements are amortized
on a straight-line basis over the remaining life of the lease.



                                       F-9
<PAGE>

Use of Estimates

      The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.

Carrying Value of Long-Lived Assets and Long-Lived Assets to be Disposed Of

      In accordance with Financial Accounting Standards Board Statement No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long Lived Assets to
be Disposed Of," we record impairment losses on long-lived assets when events
and circumstances indicate that the assets might be impaired and the
undiscounted cash flows estimated to be generated by those assets are less than
the carrying amounts of those assets. Based on our estimate of future
undiscounted cash flows, except for a reserve included in the estimated
restructuring charge (see Note 2), we expect to recover the carrying amounts of
our long-lived assets. Nonetheless, it is reasonably possible that the estimate
of undiscounted cash flows may change in the near term resulting in the need to
write-down those assets to fair value.

Segment Reporting


      In June 1997, the FASB issued SFAS No. 131, Disclosures about Segments of
an Enterprise and Related Information ("FAS131"). SFAS 131 establishes standards
for the way that public business enterprises report information about operating
segments in annual financial statements and requires that those enterprises
report selected information about operating segments in interim financial
reports. It also establishes standards for related disclosures about products
and services, geographic areas, and major customers. We have determined that in
1996, 1997 and 1998, we operated in only one segment.



Unaudited Interim Financial Statements

     The  unaudited  interim  financial   statements  include  all  adjustments,
consisting only of normal recurring accruals, which the Company considers
necessary for a fair presentation of the financial position of the Company as of
March 31, 1999 and the results of operations and the statement of cash flows of
the three months ended March 31, 1998 and 1999, as presented in the accompanying
unaudited interim financial statements.


Reclassification

      Certain prior year amounts have been reclassified to conform to the
current year's presentation.

2.  Restructuring Plan


      On February 1, 1999, we announced and initiated implementation of a
restructuring plan which resulted in the closing down of the operations of our
pharmaceutical business. We now intend to out-license worldwide marketing rights
to all our pharmaceutical compounds and will focus our efforts on the
development and commercialization of botanical dietary supplements through our
botanicals division. The restructuring plan includes: cessation of
pharmaceutical research and development activities and related operations; sale
or outlicensing of all of our current pharmaceutical research programs;
reduction in force of approximately 60 employees (65% of our workforce);
dedication of initially 12 employees (as of February 26, 1999, 5 employees
remain) to the process of closing down the pharmaceutical business; termination
of the research and development contract with Lipha/Merck; settlement of
outstanding long-term equipment financing obligations; sale or disposal of all
of our fixed assets that are not needed for our botanicals business; and
sub-lease a portion of the facility.



      The termination of 60 employees occurred on February 1, 1999. We recorded
total costs of the restructuring in the first quarter of 1999 of $2.2 million.


3.  Collaborative Relationships


      In September 1996, we entered into a five-year collaborative agreement
with Lipha/Merck to jointly develop Shaman's antihyperglycemic drugs. Upon
signing the collaboration, we received an annual research fee of $1.5 million
which was amortized to revenue over twelve months as the work was performed. We
also received approximately $3 million for 19,446 shares of common stock priced
at $154.20 per share, representing a 20% premium to the weighted average price
of the common stock at the time of purchase. In exchange for development and


                                      F-10
<PAGE>

marketing rights in all countries except Japan, South Korea, and Taiwan (which
are covered under an earlier agreement between Shaman and Ono Pharmaceutical Co.
Ltd. Osaka, Japan ("Ono"), Lipha/Merck agreed to provide up to $9.0 million in
research payments and up to $10.5 million in equity investments priced at a 20%
premium to a multi-day volume weighted average price of common stock at the time
of purchase. The research payments were recognized as revenue ratably as the
related costs were incurred by us in the performance of our obligations to
perform certain research and clinical trial activities. The agreement also
provided for additional preclinical and clinical milestone payments to us in
excess of $10.0 million per compound for each antihyperglycemic drug developed
and commercialized. Lipha/Merck agreed to bear all pre-clinical, clinical,
regulatory and other development expenses associated with the compounds selected
under the agreement. Preclinical and clinical milestone payments would be
recognized as revenue as certain preclinical hurdles were met and as certain
phases of the clinical trials and the FDA approval process were completed. In
addition, as products were commercialized, Shaman would receive royalties on all
product sales outside the United States and up to 50% of the profits (if we
exercise our co-promotion rights) or royalties on all product sales in the
United States. Certain of the milestone payments would be credited against
future royalty payments, if any, due to us from sales of products developed
pursuant to the agreement.


      In December 1998, we renegotiated the terms of the existing agreement with
Lipha/Merck. Under the new terms, we forgave $6.0 million in aggregate payments
due over the remaining term of the original agreement in exchange for a one-time
up-front payment of an aggregate of $2.0 million, consisting of a $1.0 million
research payment (which remains recorded as deferred revenue that we have not
yet earned) and a $1.0 million equity investment.


      For the year ended December 31, 1998, Shaman recognized $1.9 million in
revenue from the Lipha/Merck collaboration. In addition, we received a total
$2.5 million for issuance of 57,762 shares of common stock (40,650 shares priced
at $37.00 per share in September 1998 and 17,112 shares priced at $58.40 per
share in December 1998), each representing a 20% premium to the weighted average
price of common stock at the time of purchase. Revenues from Lipha/Merck
accounted for 12%, 43% and 70% of total revenues earned in 1996, 1997 and 1998
respectively.


      On February 1, 1999, we discontinued all research and development
activities related to the collaborative agreement. We are currently in
negotiations with Lipha/Merck, for the discontinuation of this research
agreement. There will be no further research payments from Lipha/Merck.

      In May 1995, we entered into a collaborative agreement with Ono providing
for, among other things, three years of funding for the research and development
of compounds for the treatment of Type II diabetes. Under the agreement, Shaman
was obligated to screen 100 diabetes-specific plants per year in vivo, isolate
and identify active compounds, and participate in any medicinal chemistry
modification. In turn, Ono provided us with access to Ono's preclinical and
clinical development capabilities through proprietary in vitro assays and
medicinal chemistry effort. Ono's development and commercialization rights are
for the countries of Japan, South Korea and Taiwan. Under the terms of the
agreement, Ono provided $7.0 million in collaborative research funding and will
pay preclinical and clinical milestone payments of $4.0 million per compound for
each antidiabetic drug that is commercialized.


      We received an additional $1.0 million payment (beyond the $7.0 million
commitment) in December 1996 for enhanced access rights to these compounds. For
the years ended December 31, 1996, 1997 and 1998, Shaman recognized $3.0
million, $2.0 million and $790,000, respectively in revenue from the Ono
collaboration. Revenues from Ono accounted for 88%, 57% and 30% of total
revenues earned in 1996, 1997 and 1998, respectively.


      In May 1998, our collaborative agreement with Ono, and the ongoing
research and development funding received pursuant thereto, expired under the
original terms thereof and was not renewed. Under the agreement, Ono will
continue to provide milestone payments and royalties to us on any resulting
products Ono develops from compounds identified during the three-year term of
the agreement.


      Costs associated with revenue from these collaborations totaled $11.6
million, $11.4 million and $8.2 million for the year ended December 31, 1996,
1997 and 1998, respectively, and are included in research and development
expenses in the accompanying financial statements.



                                      F-11
<PAGE>

4.  Investments

   The following is a summary of available-for-sale securities (in thousands):

<TABLE>

<CAPTION>
                                               December 31, 1997
                                  --------------------------------------------
                                            Gross        Gross      Estimated
                                          Unrealized   Unrealized     Fair
                                    Cost    Gains       Losses       Value
                                  ------- ----------   ----------   ----------
<S>                               <C>       <C>         <C>           <C>
   U.S. Treasury securities
     and government obligations   $ 4,625   $     --    $    (10)     $ 4,615
   U.S. corporate bonds             3,000         --          --        3,000
   U.S. corporate commercial
     paper and other               10,810         --         (20)      10,790
                                  -------   --------     --------    --------
        Total                     $18,435   $     --    $    (30)     $18,405
                                  =======   ========     ========    ========


 Above amounts are included in the balance sheet as follows:

    Cash and cash equivalents     $ 8,345        --     $    (20)     $ 8,325
    Short-term investments         10,090        --          (10)      10,080
                                  -------   --------     --------    --------
        Total                     $18,435   $     --    $    (30)     $18,405
                                  =======   ========     ========    ========


                                                December 31, 1998
                                  --------------------------------------------
                                            Gross        Gross      Estimated
                                          Unrealized   Unrealized     Fair
                                    Cost    Gains       Losses       Value
                                  ------- ----------   ----------   ----------

   U.S. Treasury securities
     and government obligations   $ 2,255   $     --    $     (5)     $ 2,250
   U.S. corporate bonds             1,000         --          --        1,000
   U.S. corporate commercial
     paper and other                4,984         --         (10)       4,974
                                  -------   --------     --------    --------
        Total                     $ 8,239   $     --    $    (15)     $ 8,224
                                  =======   ========     ========    ========


 Above amounts are included in the balance sheet as follows:

    Cash and cash equivalents     $ 4,957        --     $    (10)     $ 4,947
    Short-term investments          3,282        --           (5)       3,277
                                  -------   --------     --------    --------
        Total                     $ 8,239   $    --     $    (15)     $ 8,224
                                  =======   ========     ========    ========


                                                March 31, 1999
                                  --------------------------------------------
                                            Gross        Gross      Estimated
                                          Unrealized   Unrealized     Fair
                                    Cost    Gains       Losses       Value
                                  ------- ----------   ----------   ----------

   U.S. Treasury securities
     and government obligations   $ 1,004   $     --     $     -     $  1,004
   U.S. corporate commercial
     paper and other                  644         --           -          644
                                  -------   --------     --------    --------
        Total                     $ 1,648   $     --     $     -     $  1,648
                                  =======   ========     ========    ========


 Above amounts are included in the balance sheet as follows:

    Cash and cash equivalents     $   644        --     $      -     $    644
    Short-term investments          1,004        --            -        1,004
                                  -------   --------     --------    --------
        Total                     $ 1,648   $    --     $      -    $   1,648
                                  =======   ========     ========    ========


</TABLE>


                                      F-12
<PAGE>


      The average remaining maturity of the portfolio was approximately four and
one-half months at December 31, 1997 and approximately less than one month as of
December 31, 1998, respectively.


      The estimated fair value amounts have been determined by us using
available market information and appropriate valuation methodologies. However,
judgment is required in interpreting market data to develop the estimates of
fair value.

5.  Long-Term Obligations

      At December 31, 1998, long-term obligations consist of secured and
unsecured term loans and secured borrowings used to acquire property and
equipment, capital lease arrangements and a leasehold improvement financing
obligation.

      In May 1997, we obtained a $5.0 million term loan to payoff pre-existing
debt, finance capital asset acquisitions and finance continued research and
clinical development. The loan is payable in thirty-six equal monthly
installments and the interest rate is 14.58%. The lender was granted warrants to
purchase 10,000 shares of common stock at $125.00 per share, which are
exercisable over a ten-year period. We have attributed a value of $648,000 to
these warrants. This amount has been recorded as a discount on the related debt
and is being amortized as interest expense over the term of the loan.

      In June 1997, we issued $10.4 million of senior convertible notes with an
original maturity of August 2000. Interest, at 5.5% per annum, on the notes was
payable in common stock or cash at our option. Initially, the notes were
convertible into common stock at 100% of the low trading price during a
designated time period prior to conversion provided that the conversion price
would not be less than $110.00 per share. Starting in November 1997, the notes
were convertible into common stock at a 10% discount from the low trading price
during a designated time period prior to the conversion, with a floor of $110.00
through March 31, 1998, pursuant to a March 1998 amendment agreement with the
note holders whereby we issued to the note holders three-year warrants to
purchase an aggregate of 6,875 shares of common stock at an exercise price of
$150.00 per share as consideration for entering into the amendment agreement. We
have attributed a value of $309,000 to these warrants. This amount was recorded
as a discount on the related debt and was amortized as interest expense over the
term of the loan. Of the notes issued, $400,000 was issued to the placement
agent as part of the placement fee. We paid the placement agent an additional
$300,000 in cash. The placement fees and other offering costs have been
capitalized in other assets as deferred issuance costs and were amortized to
interest expense over the life of the notes to the extent the notes were not
converted to common stock. The net proceeds totaled approximately $9.5 million
after the placement agent's fees and other offering expenses. In connection with
the issuance of the notes, we recognized a non-cash charge in the amount of
$3,692,000, representing the value attributed to the in-the-money conversion
feature of the senior convertible notes.

      Through December 9, 1998, an aggregate principal balance of approximately
$5.6 million of the Senior Convertible Notes was converted into an aggregate of
128,563 shares of common stock. On December 10, 1998, we issued to the note
holders an aggregate of 4,784 shares of our Series D Convertible Preferred Stock
in exchange for the cancellation of an aggregate of $4.8 million (including
accrued interest) of the notes.


      Equipment borrowings totaled $401,555 and $0 at December 31, 1997 and
1998, respectively. The borrowings carried interest at rates ranging from 10.7%
to 12.75% at December 31, 1997, were secured by the equipment acquired, and were
payable in monthly installments ranging from $10,000 to $156,000 through
December 1998.


      We also acquired certain equipment and furniture pursuant to capital lease
arrangements. The gross amount of equipment and furniture and the related
accumulated amortization recorded under capital leases included in property and
equipment are as follows:

<TABLE>

<CAPTION>
                                                     1997             1998
                                                 ------------     ------------
<S>                                              <C>              <C>
             At December 31,
               Equipment and furniture           $ 1,890,164      $ 2,401,286
               Less accumulated amortization      (1,354,475)      (1,668,460)
                                                 ------------     ------------
                                                 $   535,689      $   732,826
                                                 ============     ============
</TABLE>


      Amortization of assets acquired under capital leases is included in
depreciation and amortization expense.

      In connection with the facility lease described in Note 6, we entered into
an agreement with the former tenant of the facility to acquire approximately
$1.5 million of tenant improvements by making annual payments to the former
tenant, including accrued interest of $540,000 in 1999 through 2002. The 1998
payment was not paid until January 1999.


                                      F-13

<PAGE>

Fair Value of Long-Term Obligations

      The fair values of our long-term obligations are estimated using
discounted cash flow analyses based on our current incremental borrowing rate
for similar types of borrowing arrangements. The carrying amounts and fair
values of long-term obligations consisted of the following at December 31, 1998:

<TABLE>
<CAPTION>
                                            Carrying Value        Fair Value
                                            --------------        ----------
<S>                                          <C>                  <C>
      Leasehold improvements financings      $ 2,032,045          $ 2,213,059
      Secured Loan                           $ 2,724,189          $ 2,414,913

</TABLE>

      The carrying  value of our term loan  approximates  our fair value because
the interest rates on the note takedowns are periodically reset.

      At December 31, 1998,  future  payments on  long-term  obligations  are as
follows:

<TABLE>
<CAPTION>
                                                         Leasehold
                              Secured        Capital     Improvement
                               Loan          Leases      Financing       Total
                            -----------     --------     ------------    -----
<S>                       <C>              <C>          <C>          <C>

   1999                      $1,893,219    $ 257,889    $1,080,000   $3,231,108
   2000                         830,970      281,333       540,000    1,652,303
   2001                               -      270,635       540,000      810,635
   2002                               -       60,673       540,000      600,673
   2003                               -            -             -            -
                            -----------   ----------   -----------  -----------
   Total minimum payments    $2,724,189    $ 870,530    $2,700,000   $6,294,719
   Less amount representing
     interest (at rate
     ranging from 9.5%
     to 12.0%)                        -     (119,766)     (667,955)    (787,721)
                            -----------   ----------   -----------  -----------
                             2,724,189       750,764     2,032,045    5,506,998
   Less current
     installments           (1,893,219)     (219,232)     (691,410)  (2,803,861)
                            -----------   ----------   -----------  -----------
   Long-term obligations,
     excluding current
     installments            $ 830,970     $ 531,532    $1,340,635   $2,703,137
                            ===========   ==========   ===========   ==========
</TABLE>

6.   Commitments and Contingencies

      We  lease  our  research  and  office  facility  in South  San  Francisco,
California under a noncancellable agreement expiring 2003, with options to renew
for a total of ten years. We are required to pay operating costs, including
property taxes, utilities, insurance and maintenance.

      At December 31, 1998, the minimum  noncancellable  future rental  payments
under our operating leases are:

<TABLE>
<CAPTION>
<S>                      <C>       <C>
                         1999      $ 1,210,837
                         2000        1,544,555
                         2001        1,590,892
                         2002        1,638,618
                         2003          281,296
                                  ------------
                                   $ 6,266,198
                                  ============
</TABLE>


      Rent expense for each of the three years ended December 31, 1996, 1997 and
1998 was approximately $1,348,000 $1,154,000 and $1,189,000, respectively.


      We are involved in a litigation  and disputes  which are incidental to our
business. While it is not possible to predict or determine the outcome of such
litigation and disputes, or to provide an estimate of the losses, if any, that
may arise, we believe the costs associated with all of these actions will not
have a material effect on our consolidated financial position or liquidity, but
could possibly be material to the consolidated results of operations.



                                      F-14
<PAGE>

      Further, product liability claims may be asserted in the future relative
to events not known to management at the present time. We have insurance
coverage which we believe is adequate to protect against such product liability
losses as could materially affect our financial position.

7.  Contractual Agreements

      We have entered into license, clinical trial and supply agreements with
universities, research organizations and commercial companies. Certain of these
agreements require payments of royalties on future sales of resulting products
and may subject us to minimum annual payments to our contract partners. In
addition, we signed an agreement in 1995 which could result in the payment of
milestone installments if certain development objectives are achieved. To date,
payments under these agreements have not been significant and, at December 31,
1998, related noncancellable commitments are immaterial.

8.  Stockholders' Equity

Preferred Stock

      We are authorized to issue 1,000,000 shares of preferred stock (519,533
shares of which are issued and outstanding at December 31, 1998). Our Board of
Directors may set the rights and privileges of any preferred stock issued.

      On December 10, 1998, we and certain institutional investors exchanged an
aggregate of $4.8 million (including accrued interest) of the Senior Convertible
Notes (the "Notes") for an aggregate of 4,784 shares of our Series D Convertible
Preferred Stock. Each share of Series D Convertible Preferred Stock is entitled
to receive, when, as, and if declared by the Board of Directors out of funds
legally available for such purpose, cumulative dividends at the rate of $55 per
annum. Dividends on the Series D Preferred Stock are payable in cash or shares
of our common stock or any combination of cash and shares of common stock, at
our option and are payable quarterly on February 1, May 1, August 1 and November
1 of each year. Each share of Series D Preferred Stock is convertible, at any
time, into common stock at the lesser of (a) $22.50 per share or (b) 90% of the
low trading price during a designated time period prior to the conversion. In
addition, the holders received an aggregate of 38,373 warrants to purchase
additional shares of common stock in exchange for surrendering the redemption
rights previously held by them under the Notes. The warrants were priced at 150%
of the average closing price for the month of December 1998. We have attributed
a value of $943,680 to these warrants. In connection with the issuance of the
Series D Preferred Stock, we also recognized a non-cash charge in the amount of
$1,063,605, representing the value attributed to the in-the-money conversion
feature of the Series D Preferred Stock.

      The delisting of our common stock from The Nasdaq National Market
constituted an Optional Redemption Event (as defined in the Certificate of
Designation of Series D Preferred Stock) for the Series D Preferred Stock. In
connection therewith, on February 4, 1999, we issued a Control Notice (as
defined in the Certificate of Designation of Series D Preferred Stock) that
prevented the redemption of the Series D Preferred Stock. This Control Notice
will remain in effect for as long as we are not listed on any of The Nasdaq
National Market, The Nasdaq SmallCap Market, the American Stock Exchange or the
New York Stock Exchange. Delivery of the Control Notice had the effect of
increasing the annual dividend to $180 per share and adjusting the conversion
price of the Series D Preferred Stock to 80% of the amount the conversion price
would otherwise be.

      In October 1998, we completed the sale to the public of an aggregate of
140,880 shares of our Series C Convertible Preferred Stock for aggregate gross
proceeds of $14.1 million. Each share of Series C Preferred Stock is entitled to
receive cumulative dividends paid semi-annually to the holders of record of such
shares as follows: (i) an annual stock-on-stock dividend, paid in arrears, in
shares of common stock (calculated as the quotient of $10.00 divided by 85% of
the average closing price of the common stock for the 10-day trading period
ending three trading days prior to the date the dividend is paid); plus (ii) a
cash amount equaling 0.00005% of our U.S. net sales of our SP-303/Provir product
for the treatment of diarrhea, if any, for the preceding two calendar quarters
less $5.00. If, under Delaware law, we are unable to pay the cash portion of the
dividends, then the cash portion will be paid in shares of common stock (valued
at 85% of the average closing price of the common stock for the 10-day trading
period ending three trading days prior to the date on which the dividend is
paid). We intend to honor this royalty portion of the dividend through the sale
of our first botanical product, if any. Each share of the Series C Preferred
Stock was convertible for a period of 30 days after the first issuance and will
be convertible again commencing 12 months after the initial issuance date
(August 18, 1998) at the election of each holder, and automatically on the sixth
anniversary of the initial issuance date into greater of (a) 0.8333 shares of
common stock or (b) such number of shares of common stock as equals $100 (the
price paid per share of Series C Preferred Stock) divided by 85% of the average
closing price of the common stock reported by Nasdaq for the 10-day trading
period ending three trading days prior to the date of conversion. The common

                                      F-15
<PAGE>

stock is currently trading on The Nasdaq OTC Bulletin Board. During the initial
30-day conversion period for the Series C Preferred Stock, 24,922 shares of the
Series C Preferred Stock were converted into an aggregate of 93,077 shares of
common stock. In connection with the issuance of the Series C Preferred Stock,
we recognized a non-cash charge in the amount of $678,636.

      In June 1998, we entered into Stock Purchase Agreements with certain of
our stockholders (the "Buyers") pursuant to which we acquired the right to sell
to the Buyers, subject to certain conditions up to an aggregate of 7,000 shares
of Series B Custom Convertible Preferred Stock for an aggregate purchase price
of $7,000,000. The Stock Purchase Agreements were terminated upon the closing of
the Series C Convertible Preferred Stock Financing in October 1998. As
consideration for entering into the Stock Purchase Agreements, we issued to the
Buyers warrants to purchase an aggregate of 17,500 shares of common stock. The
warrants are exercisable for a period of five years at an exercise price per
share equal to 115% of the average trading price of the common stock during
specified measurement periods. We have attributed a value of $1.5 million to
these warrants.

      In July 1996, we closed a private placement pursuant to Regulation S under
the Securities Act of 1933, as amended, in which it received gross proceeds of
$3.3 million for the sale of 400,000 shares of Series A Convertible Preferred
Stock and for the issuance of a six-year warrant to purchase 27,500 shares of
common stock at an exercise price of $203.60 per share. The Preferred Stock does
not carry a dividend obligation and will convert into common stock no later than
July 23, 1999 at a price per share between $120.00 and $163.00, depending on the
market value of common stock during the period prior to conversion. The holder
of preferred shares is entitled to a liquidation preference of 163.00 per share.

Common Stock

      In December 1992, we adopted the 1992 Stock Option Plan (the "Plan") as
the successor plan to our 1990 Stock Option Plan. The Plan will terminate on the
earlier of December 31, 2002 or the date on which all shares available for
issuance under the Plan have been issued or canceled. The Plan provides for two
separate components: the Discretionary Option Grant Program and the Automatic
Option Grant Program.

      Under the Discretionary Option Grant Program, options granted may either
be incentive options or non-statutory options. Incentive options may be granted
to employees at a price not less than the fair market value of Common Stock on
the grant date. Non-statutory options may be granted at a price determined by
the plan administrator. Each option granted is exercisable as determined by the
plan administrator, with a term not to exceed ten years. The Plan also allows
for the granting of options with repurchase rights and stock appreciation rights
at the discretion of the plan administrator.

      Under the Automatic Option Grant Program, each individual who becomes a
non-employee board member on or after the effective date of the Plan is
automatically granted a non-statutory stock option to purchase 1,000 shares of
common stock. Further, each non-employee board member who has served as a member
for at least six months prior to the annual stockholders' meeting is
automatically granted an annual non-statutory stock option to purchase not more
than 375 nor less than 250 shares of common stock, depending on a calculation
based on the average selling price of the common stock. The exercise price of
each option granted is the fair value of the common stock on the date of grant.
These options have a ten-year term and vest over 24 months.

      On September 18, 1998, the Plan Administrator implemented an option
cancellation/regrant program for all employees of the Company, including our
executive officers. Pursuant to that program, each such employee was given the
opportunity to surrender his or her outstanding options under the Plan with
exercise prices in excess of $25.62 per share in return for a new option grant
for the same number of shares but with an exercise price of $25.62 per share,
the closing selling price per share of common stock as reported on the Nasdaq
National Market on the September 18, 1998 grant date of the new option. Options
for a total of 92,760 shares with a weighted average exercise price of $105.50
per share were surrendered for cancellation, and new options for the same number
of shares were granted with the $25.62 per share exercise price. To the extent
the higher-priced option was exercisable for any option shares on the September
18, 1998 cancellation date, the new option granted in replacement of that option
will become exercisable for those shares in a series of twelve (12) successive
equal monthly installments upon the optionee's completion of each month of
service over the one (1) year period measured from the September 18, 1998 grant
date. The option will become exercisable for the remaining option shares in one
or more installments over the optionee's period of continued service, with each
such installment to vest on the same vesting date in effect for that installment
under the cancelled higher-priced option.

     On October 20, 1998, the Plan Administrator implemented an option
cancellation/regrant program for the non-employee Board members (excluding the
Plan Administrator) and certain key independent consultants holding options

                                      F-16
<PAGE>

under the Plan. Pursuant to the October program, each such individual was given
the opportunity to surrender his or her outstanding options under the Plan with
exercise prices in excess of $28.75 per share in return for a new option grant
for the same number of shares but with an exercise price of $28.75 per share,
the closing selling price per share of common stock as reported on the Nasdaq
National Market on the October 20, 1998 grant date of the new option. Options
for a total of 29,232 shares with a weighted average exercise price of $122.46
per share were surrendered for cancellation, and new options for the same number
of shares were granted with the $28.75 per share exercise price. To the extent
the higher-priced option was exercisable for any option shares on the October
20, 1998 cancellation date, the new option granted in replacement of that option
will become exercisable for those shares in a series of twelve (12) successive
equal monthly installments upon the optionee's completion of each month of
service over the one (1) year period measured from the October 20, 1998 grant
date. The option will become exercisable for the remaining option shares in one
or more installments over the optionee's period of continued service, with each
such installment to vest on the same vesting date in effect for that installment
under the cancelled higher-priced option.

      Both programs provide for automatic acceleration of the exercise period in
the event of certain corporate transactions, including a merger, asset sale or
change in control of the Company.

      The 1990 Stock Option Plan provided for the granting of incentive and
non-statutory stock options. Both types of options were immediately exercisable
and expire ten years from the date of grant. Vesting of optioned shares was
determined by the board of directors and generally occurred over a two- to
four-year period from the date of grant. At December 31, 1998, all options to
purchase common stock issued under this plan were vested.

      A summary of stock option activity is as follows:

<TABLE>
<CAPTION>

                                           Options Outstanding
                             ------------------------------------------------------
                                                            Weighted      Weighted
                                                             Average      Average
                              Number        Price Per       Exercise     Fair Value
                             of Shares        Share           Price       At Grant
                                                                            Date
                             ---------   ---------------    ---------   -----------
<S>                         <C>           <C>               <C>       <C>
Balance at
   December 31, 1996          105,099     $1.20--$265.00     $109.60
  Granted at fair value        47,577     82.60-- 136.20      108.20       $69.20
  Exercised                      (974)     4.80-- 117.60       65.80
  Forfeited                   (12,115)    70.00-- 265.00      128.00
                           -----------
Balance at
   December 31, 1997          139,587      1.20-- 265.00      108.00
  Granted at fair value       221,017     25.62--  98.75       29.79       $29.81
  Exercised                      (792)     1.20--  70.00       27.41
  Forfeited                  (139,135)    25.62-- 265.00      110.84
                          -----------
Balance at
   December 31, 1998          220,677     $1.20-- 215.00     $ 28.13
                          ===========
</TABLE>


      At December 31, 1998, 30,407 shares under options were exercisable at a
weighted average exercise price of $33.19 per share (65,502 shares under options
were exercisable at a weighted average exercise price of $105.00 per share at
December 31, 1997). A stock option grant of 75,000 shares of common stock
granted on September 18, 1998 at an exercise price of $25.62 per share was
pending stockholder approval.




                                      F-17
<PAGE>

      The  following  table  summarizes   information  regarding  stock  options
outstanding at December 31, 1998:

<TABLE>
<CAPTION>

                                           Weighted                       Shares under Options
                                            Average                          Exercisable at
                       Option Shares      Contractual     Weighted         December 31, 1998
      Range of         Outstanding at      Remaining      Average     ---------------------------
      Exercise           December 31,        Life         Exercise              Weighted Average
      Prices                1998            (Years)         Price      Number    Exercise Price
  ----------------    ----------------   -------------   ----------   --------   ----------------
<S>    <C>        <C>             <C>          <C>       <C>          <C>
   $1.20 - $ 30.00         209,767          9.36          $ 25.40      26,650       $ 20.74
   40.63 -   72.50           7,275          9.32            52.71       1,177         70.34
   82.50 -  107.50           1,271          8.87           100.26         662        100.62
  127.50 -  162.50           1,862          7.81           140.90       1,416        142.54
  210.00 -  215.00             502          4.00           210.02         502        210.02
                        ----------                       --------
   $1.20 - $215.00         220,677          9.33          $ 28.13      30,407       $ 33.19
                        ==========                       ========
</TABLE>


      For certain options issued during the years ended December 31, 1993 and
1994, we recorded deferred compensation for the difference between the exercise
price and the fair market value of common stock at the date of grant. For
certain additional options issued during the years ended December 31, 1997 and
1998 to non-employees, we recorded deferred compensation expense for the fair
value of the options at the date of grant. Deferred compensation is amortized to
expense on a straight-line basis over the vesting period of the options.

Pro Forma Information

      We have elected to follow Accounting Principles Board Opinion No. 25,
Accounting for Stock Issued to Employees ("APB 25"), and related interpretations
in accounting for our employee stock options because, as discussed below, the
alternative fair value accounting provided for under SFAS 123 requires use of
option valuation models that were not developed for use in valuing employee
stock options. Under APB 25, because the exercise price of our employee stock
options equals the market price of the underlying stock on the date of grant, no
compensation expense is recognized.


      Pro forma information regarding net loss and net loss per share is
required by SFAS 123, and has been determined as if we had accounted for our
employee stock options granted subsequent to December 31, 1994 under the fair
value method of SFAS 123. The fair value for these options was estimated at the
date of grant using the Black-Scholes option pricing model. The following are
the weighted-average assumptions for 1996, 1997 and 1998, respectively:
risk-free interest rates of 5.73%, 6.27% and 4.57%; no dividends paid;
volatility factors of the expected market price of common stock of .75 and a
weighted-average expected life of the options of 3.85, 5.0 and 3.84 years. The
effects of applying FAS 123 for recognizing compensation expense and providing
pro forma disclosures in 1998, 1997 and 1996 are not likely to be representative
of the effects on reported net income in future years.


      The Black-Scholes option valuation model was developed for use in
estimating the fair value of traded options which have no vesting restrictions
and are fully transferable. In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility. Because our employee stock options have characteristics
significantly different from those of traded options, and because changes in the
subjective input assumptions can materially affect the fair value estimate, in
management's opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of our employee stock options.

      For purposes of pro forma  disclosures,  the  estimated  fair value of the
options is amortized to pro-forma net loss over the options' vesting periods.
Our pro forma information follows (in thousands except for net loss per share
information):

<TABLE>

<CAPTION>
                                             1996         1997          1998
                                          ---------     ---------     ---------
<S>                                       <C>           <C>            <C>
          Net loss applicable to
            Common Stockholders
              Historical                  $(18,790)     $(29,289)     $(38,524)
              Pro forma                   $(20,280)     $(31,101)     $(40,734)
          Net loss per common share
              Historical                  $ (27.85)     $ (34.44)     $ (38.31)
              Pro forma                   $ (30.05)     $ (36.57)     $ (40.50)

</TABLE>



                                      F-18
<PAGE>

Reserved Shares

      At December 31, 1998, 386,781 shares of common stock were reserved for
conversion of outstanding preferred stock and for issuance upon exercise of
outstanding options, warrants and options available for future grant. The
reserved shares excluded shares issuable upon conversion of Series C Preferred
Stock and 145,189 shares issuable upon exercise of the Company's stock options
which are exercisable after May 31, 1999.

Warrants

      A summary of outstanding warrants to purchase common stock at December 31,
1998 is as follows:

<TABLE>
<CAPTION>
                                                   Number of            Exercise         Term
                   Description                     Warrants               Price         in Year      Expiration
       ------------------------------------      ---------------    ----------------    -------    -------------
<S>                           <C>        <C>               <C>     <C>
       Lease financing arrangements                   4,585         $48.00 - $216.60     5 - 7      2000 - 2002
       Series A Convertible Preferred Stock          27,500             $203.68            6           2002
       Secured term loan                             10,000             $125.00           10           2007
       Senior convertible notes                       6,875             $150.00            3           2001
       Series B Convertible Preferred Stock          17,500         $53.00 - $ 96.40       5           2003
       Series D Convertible Preferred Stock          38,373              $61.40            5           2003
                                                  ---------
                                                    104,833
                                                  =========
</TABLE>


9.  Taxes

      As of December 31, 1998, we had federal net operating loss carryforwards
of approximately $141.2 million. The net operating loss and credit carryforwards
will expire at various dates beginning in 2004 through 2013, if not sooner
utilized.

      Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
and the amounts used for income tax purposes.

      Significant components of our deferred tax assets and liabilities for
federal and state income taxes as of December 31, 1997 and 1998 are as follows:

<TABLE>

<CAPTION>
                                                         1997          1998
                                                     ------------  ------------
<S>                                                 <C>             <C>
   Deferred tax assets:
     Net operating  loss carryforwards             $  35,200,000   $ 48,600,000
     Research credits (expiring  in 2004--2013)        2,800,000      3,900,000
     Capitalized research and development costs        4,700,000      6,400,000
     Other                                               400,000     (1,200,000)
                                                    ------------   ------------
         Total deferred tax assets                    43,100,000     57,700,000
      Valuation allowance for deferred tax assets    (43,100,000)   (57,700,000)
                                                    ------------   ------------
      Net deferred tax asset                       $           -   $          -
                                                   =============  =============
</TABLE>


      The net valuation  allowance  increased by $14.6  million  during the year
ended December 31, 1998.

      Utilization of the net operating losses and credits may be subject to a
substantial annual limitation due to the "change in ownership" provisions of the
Internal Revenue Code of 1986 and similar state provisions. The annual
limitation may result in the expiration of net operating losses and credits
before utilization.

10.    Subsequent Events

      In April 1999, directors of the Company holding stock options to purchase
an aggregate of 131,717 shares of common stock agreed to surrender these options
to the Company for cancellation.

      On April 5, 1999, the Company entered into a credit facility and note
purchase agreement with certain investors, stockholders, officers and members of
the board of directors (the "Credit Agreement"), pursuant to which the Company
may borrow approximately $1.0 million at any time commencing on May 14, 1999 and
until the earlier of the completion of a registered public offering of the
Company's equity securities, or September 1, 1999 (the "Convertible Promissory


                                      F-19
<PAGE>

Notes"). The Convertible Promissory Notes will be due and payable on the earlier
of (i) 30 days subsequent to the completion of the public offering, or (ii)
December 31, 1999. Interest on the Convertible Promissory Notes will accrue at
an annual rate of 12%. The Convertible Promissory Notes, when issued, will be
secured by certain assets of the Company and be convertible into shares of the
class and series of equity securities offered by the Company in the public
offering, or into common stock if no such offering occurs prior to December 31,
1999. In connection with the Credit Agreement, the Company issued warrants to
purchase shares of the same class and series of equity securities as those into
which the debt is convertible. The number of shares subject to these warrants is
equal to 50% of the debt amount divided by the per share sale price of the
shares sold in the public offering. These warrants are exercisable, on a
cashless basis, commencing on April 5, 1999, and through the third anniversary
date of the public offering. The conversion price of the Convertible Promissory
Notes and the exercise price of the warrants is equal to the per share offering
price in the public offering. If a public offering is not completed prior to
December 31, 1999, then the conversion price of the Convertible Promissory Notes
and the exercise price of the warrants will be the lower of $0.05 per share of
common stock, or 1/3 of the five-day weighted average trading price of the
Company's common stock for the period ending three trading days prior to
conversion or exercise.

      In April 1999, the Company entered into an amendment agreement with an
existing lender to permit the issuance by the Company of the Convertible
Promissory Notes. In connection with the amendment, the Company issued a warrant
to purchase shares of the class and series of equity securities offered by the
Company in the first registered public offering by the Company after the date of
the loan amendment, or into common stock if no such offering occurs prior to
December 31, 1999. The number of shares subject to these warrants is equal to
$592,685 divided by the per share sale price of the shares sold in the above
offering. This warrant is exercisable, on a cashless basis, commencing on April
30, 1999 and through the seventh anniversary date of the earlier to occur of (i)
December 31, 1999, or (ii) the date of the above offering. The per share
exercise price will be equal to the per share offering price of the above
offering, or, if no offering is completed by December 31, 1999, then the lower
of $0.05 per share of common stock, or 1/3 of the five-day weighted average
trading price of the common stock for the period ending three trading days prior
to conversion or exercise.

      On June _____, 1999, the stockholders approved and the Company effected a
one-for-twenty reverse stock split of the Company's outstanding common stock.
All common shares and per common share amounts have been restated to reflect the
reverse stock split in all periods presented.


                                      F-20
<PAGE>

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

You should rely only on the information                 7,500,000 Shares
contained in this prospectus or to which
we have referred you. We have not
authorized anyone to provide you with
information that is different. This
document may only be used where it is
legal to sell these securities. The                          [LOGO]
information in this prospectus may only
be accurate on the date of this
prospectus.

                                                       Series R Convertible
                                                          Preferred Stock
         TABLE OF CONTENTS



                                     Page
Prospectus Summary...............     3
Risk Factors.....................     9
Where You Can Find More
   Information...................    19
Use of Proceeds..................    20                   ---------------
Price Range of Common Stock......    21
Dividend Policy..................    21                      PROSPECTUS
Capitalization...................    22
Selected Financial Data..........    23                   ---------------
Management's Discussion and
  Analysis of Financial Condition
  And Results of Operations......    24
Business.........................    31
Management.......................    41
Capital Stock....................    56
Shares Eligible for Future Sale..    62
The Rights Offering..............    63                    June ____, 1999
Legal Matters....................    68
Experts..........................    68
Index to Financial Statements....   F-1


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



<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 13. Other Expenses of Issuance and Distribution.

      The  following  table  sets  forth the  various  expenses  expected  to be
incurred by the Registrant in connection with the sale and distribution of the
securities being registered hereby. All amounts are estimated except the
Securities and Exchange Commission registration fee.

          SEC registration fee.................   $  4,170
          Accounting fees and expenses.........     75,000
          Legal fees and expenses..............    100,000
          Printing and engraving fees..........     25,000
          Miscellaneous fees and expenses......     95,830
                                                  --------
                 Total.........................    300,000

Item 14. Indemnification of Directors and Officers.

      Section 145 of the Delaware General Corporation Law, as amended (the
"DGCL"), provides that a corporation may indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal or investigative
(other than an action by or in the right of the corporation) by reason of the
fact that the person is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by the person in connection with such action, suit or proceeding, if
the person acted in good faith and in a manner the person reasonably believed to
be in or not opposed to the best interests of the corporation, and, with respect
to any criminal action or proceeding, had no reasonable cause to believe the
person's conduct was unlawful. Section 145 further provides that a corporation
similarly may indemnify any such person serving in any such capacity who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action or suit by or in the right of the corporation to procure a
judgment in its favor, against expenses actually and reasonably incurred in
connection with the defense or settlement of such action or suit if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the corporation and except that no indemnification shall be
made in respect of any claim, issue or matter as to which such person shall have
been adjudged to be liable to the corporation unless and only to the extent that
the Delaware Court of Chancery or such other court in which such action or suit
was brought shall determine upon application that, despite the adjudication of
liability but in view of all the circumstances of the case, such person is
fairly and reasonably entitled to indemnity for such expenses which the Court of
Chancery or such other court shall deem proper.

      Section 102(b)(7) of the DGCL permits a corporation to include in its
certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, provided that such provision
shall not eliminate or limit the liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the DGCL (relating to
unlawful payment of dividends and unlawful stock purchase and redemption) or
(iv) for any transaction from which the director derived an improper personal
benefit.

      The Registrant's Amended and Restated Certificate of Incorporation
provides that the Registrant's directors shall not be liable to the Registrant
or its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent that exculpation from liabilities is not
permitted under the DGCL as in effect at the time such liability is determined.
The Registrant has entered into indemnification agreements with all of its
officers and directors, as permitted by the DGCL.



                                      II-1
<PAGE>


Item 15.  Recent Sales of Unregistered Securities.

      Since May 1996, we have sold and issued the following unregistered
securities (the share numbers and per share prices below reflect the
one-for-twenty reverse stock split of the outstanding common stock to be
effected prior to the completion of this offering):

      (1) In April 1999, we issued to MMC/GATX Partnership No. 1 in connection
with the amendment of a loan agreement with GATX a cashless exercise warrant to
purchase 296,342 shares of the class and series of equity securities which are
being registered under this registration statement (i.e. the Series R
Convertible Preferred Stock). This Warrant is exercisable upon the effectiveness
of this registration statement and through the seventh anniversary date of the
earlier to occur of (i) December 31, 1999, and (ii) the effective date of this
registration statement, subject to acceleration upon certain events. The per
share exercise price will be $2.00 (the per share price at which the Series R
Convertible Preferred Stock is sold hereunder).


      (2) In April 1999, we also issued to various lenders who were either
existing stockholders, key executives or directors cashless exercise warrants to
purchase 252,002 shares of the class and series of equity securities which are
being registered under this registration statement (i.e. the Series R
Convertible Preferred Stock) (the "Debt Offering"). These warrants are
exercisable upon the consummation of the sale of the Series R Convertible
Preferred Stock registered hereunder (the "Consummation Date") and through the
third anniversary date of such consummation, subject to acceleration upon
certain events. The per share exercise price will be $2.00 (the per share price
at which the Series R Convertible Preferred Stock is sold hereunder).


      (3) In connection with the Debt Offering, each lender was also issued a
Senior Subordinated Secured Convertible Promissory Note convertible after the
Consummation Date and prior to the earlier to occur of (i) January 1, 2000 and
(ii) thirty days following the Consummation Date into ____________ shares of the
Series R Convertible Preferred Stock at a conversion price of $2.00 per share.

      (4) In May 1997, we obtained a $5.0 million term loan to pay off
preexisting debt, finance capital asset acquisition and finance continued
research and development. The lender was granted warrants to purchase 10,000
shares of common stock at an exercise price of $125.00 per share. These warrants
expire May 7, 2007.


      (5) On December 10, 1998, Shaman and certain institutional investors
exchanged an aggregate of $4.8 million (including accrued interest) of Senior
Convertible Notes for common stock and an aggregate of 38,373 warrants to
purchase additional shares of common stock in exchange for surrendering the
redemption rights previously held by them under the notes. The warrants were
priced at 150% of the average closing price for the month of December 1998.


      The sales of the above securities were deemed to be exempt from
registration under the Securities Act of 1933, as amended, in reliance on
Section 4(2) of the Securities Act. In each such transaction, the recipients of
securities represented their intentions to acquire the securities for investment
only and not with a view to or for sale in connection with any distribution
thereof and appropriate legends were affixed to the securities issued in such
transactions

Item 16. Exhibits and Financial Statement Schedules.

   The  exhibits  listed  in the  Exhibit  Index  are  filed  as  part  of  this
Registration Statement.

(a) Exhibits


 Exhibit
 Number                             Description
- --------     -------------------------------------------------------------------
 3.1*        Amended and Restated Certificate of Incorporation, as filed with
             the Delaware Secretary of State on March 11, 1999.
 3.2(9)      Amended and Restated Bylaws, as amended March 29, 1996.
 4.1***      Form of  Certificate of Designation of Preferences of Series R
             Preferred Stock of the Registrant


                                      II-2
<PAGE>

 4.2(21)     Form of warrant, dated April 5, 1999, issued to certain investors
             of the Registrant.
 4.3(21)     Form of warrant, dated April 30, 1999, issued to MMC/GATX
             Partnership No.1
 4.4***      Form of Subscription Agreement
 4.5***      Form of Instructions to Stockholders
 4.6***      Form of Letter to Common Stockholders of Record
 4.7***      Form of Letter to Banks and Brokers
 4.8***      Form of Letter to Beneficial Common Stockholders
 5.1***      Opinion of Brobeck, Phleger & Harrison LLP.
10.1(1)(19)  401(k) Plan.
10.2(1)(19)  Form of Stock Purchase Agreement.
10.3(1)      Form of Indemnification Agreement.
10.4(1)      Form of Agreement with Scientific Strategy Team Members.
10.5(1)      Form of Proprietary Information and Inventions Agreement-Employees.
10.6(1)      Form of Proprietary Information and Inventions
             Agreement-Consultants.
10.7(1)(18)  License  Agreement dated February 8, 1990,  between Shaman and
             Dr. Michael Tempesta.
10.8(1)(18)  Stock Purchase Agreement dated June 15, 1990, between Shaman
             and Lisa A. Conte.
10.9(1)      Master Equipment Lease Agreement dated December 26, 1990, between
             Shaman and Lease Management Services, Inc.
10.10(1)(18) Supply Agreement dated June 1, 1992.
10.11(1)     Registration Rights Agreement dated October 22, 1992, as amended
             December 14, 1992, between Shaman and certain holders of preferred
             stock of Shaman.
10.12(1)     Industrial Lease Agreement dated January 1, 1993, between Shaman
             and Grand/ Roebling Investment Company.
10.13(4)     Loan and Security Agreement dated September 27, 1993, between
             Shaman and Household Commercial of California.
10.14(4)     Common Stock Warrant dated September 30, 1993, issued to
             MMC/GATX Partnership No. I.
10.15(4)     Common Stock Warrant dated October 5, 1993, issued to Meier
             Mitchell & Co.
10.16(6)(18) Joint Research and Product Development Agreement, dated May 24,
             1995, by and between Ono Pharmaceutical Co., Ltd. and Registrant.
10.17(a)(10) Amendment Agreement, dated December 4, 1996, to the Joint Research
             and Product Development Agreement by and between Ono Pharmacetical
             Co., Ltd. and Registrant.
10.18(6)(18) License Agreement, dated June 8, 1995, by and between Bayer AG and
             Registrant.
10.19(7)(18) Development Agreement, dated January 11, 1996, by and between
             Abbott Laboratories and Registrant.
10.20(9)(18) Subscription Agreement dated July 25, 1996 by and between the
             Registrant and Fletcher International Limited.
10.21(10)(18)Joint Research and Product Development and Commercialization
             Agreement dated September 23, 1996, by and between Lipha,
             Lyonnaise Industrielle Pharmaceutique S.A. and the Registrant.
10.22(10)(18)Stock Purchase Agreement dated September 23, 1996, by and between
             Lipha, Lyonnaise Industrielle Pharmaceutique S.A. and the
             the Registrant.
10.23(11)(19)Shaman Pharmaceuticals, Inc. 1992 Stock Option Plan (as Amended and
             Restated on February 14, 1997).
10.24(3)(19) Form of Notice of Grant with Stock Option Agreement.
10.25(3)(19) Form of Addendum to Stock Option Agreement (Special Tax Elections).
10.26(3)(19) Form of Addendum to Stock Option Agreement (Limited Stock
             Appreciation Rights).
10.27(11)(19)Form of Non-Employee Director Automatic Stock Option Agreement.
10.28(12)    Masopracol License Agreement, dated as of March 19, 1997, by
             and between Access Pharmaceuticals, Inc. and the Registrant.

                                      II-3
<PAGE>

10.29(12)(18)Amended and Restated Masopracol License Agreement, dated as
             of April 1997, by and between Access Pharmaceuticals, Inc. and
             the Registrant.
10.30(12)    Loan and Security Agreement, dated as of May 7, 1997, between
             MMC/GATX Partnership I and Registrant.
10.30A(12)   Amendment No. 1 to Loan and Security Agreement, dated as of
             June 30, 1997, by and between Registrant and MMC/GATX
             Partnership No. I.
10.30B(15)   Waiver letter dated July 16, 1998, executed by Shaman
             Pharmaceuticals, Inc. and approved by MMC/GATX Partnership
             No. I as to the payment of dividends on the Series C  Preferred
             Stock.
10.30C (21)  Amendment No. 2 to Loan and Security Agreement, dated as of
             April 30, 1999, by and between the Registrant and MMC/GATX
             Partnership No. 1.
10.31(12)    Secured Promissory Note, dated May 16, 1997, issued in favor
             of MMC/GATX Partnership No. I.
10.32(12)    Warrant, granted May 7, 1997, in favor of MMC/GATX
             Partnership No. I.
10.33(12)    Amendment to Warrants, dated May 7, 1997, MMC/GATX Partnership
             No. I and Registrant.
10.34(12)    Engagement Agreement, dated April 7, 1997, by and between
             Registrant and Diaz & Altschul Capital, LLC.
10.35(12)    Amended Engagement Agreement, dated June 30, 1997, by and between
             Registrant and Diaz & Altschul Capital, LLC.
10.36(12)    Form of Note Purchase Agreement, dated as of June 30, 1997, by and
             between Registrant and certain investors.
10.37(13)    Master Lease Agreement, dated September 15, 1997, between
             Registrant and Transamerica Business Credit Corporation, with
             related schedules.
10.38(13)    Amendment to Note Purchase Agreement, dated as of June 30, 1997, by
             and between Registrant and Certain investors.
10.39(14)    Amendment Agreement, dated as of March 18, 1998, by and between the
             Registrant and certain investors.
10.40(14)    Form of Common Stock Purchase Warrant, dated as of March 18, 1998,
             issued to certain investors.
10.41(14)    Second Amendment Agreement, dated as of June 10, 1998, by and
             between the Registrant and certain investors.
10.42(17)    Exchange Agreement, dated as of December 10, 1998, by and between
             Registrant and certain entities.
10.43(19)    Common Stock Purchase Agreement dated as of November 18, 1998.
10.44(19)(20)Employment Agreement dated as of April 1, 1998, by and between
             Registrant and John W.S. Chow.
10.45(19)(20)Promissory Note dated as of  June 17, 1998, by and between
             Registrant and John W.S. Chow.
10.46(20)    Development and Commercial Supply Agreement, dated as of December
             1, 1998, by and between Registrant and NYComed Inc.
10.47(21)    Form of Credit Facility and Note Purchase Agreement, dated as of
             April 5, 1999, by and between the Registrant and the Investors
             named therein.
10.47A(21)   Amendment No. 1 to Credit Facility and Note Purchase Agreement,
             dated as of April 13, 1999, by and between the Registrant and the
             Investors named in the Credit Facility and Note Purchase Agreement.
10.47B(21)   Amendment No. 2 to Credit Facility and Note Purchase Agreement,
             dated as of April 30, 1999, by and between the Registrant and the
             Investors named in the Credit Facility and Note Purchase Agreement.
23.1**       Consent of Ernst & Young LLP, Independent Auditors.
23.2***      Consent of Brobeck, Phleger & Harrison LLP (included in the opinion
             filed as Exhibit 5.1).
24.1*        Power of Attorney (included under the caption "Signatures").
27.1 (20)    Financial Data schedule for period ended December 31, 1998.
27.2 (21)    Financial Data schedule for period ended March 31, 1999.
- ----------



                                      II-4
<PAGE>


*   Previously filed.
**  Filed herewith.
*** To be filed by amendment.



 (1)  Incorporated by reference to exhibits filed with the Registrant's
      Registration Statement on Form S-1, File No. 33-55892 which was declared
      effective January 26, 1993.
 (2)  Intentionally omitted.
 (3)  Incorporated by reference to exhibits filed on July 23, 1993 with
      Registrant's Registration Statement on Form S-8, File No. 33-66450.
 (4)  Incorporated by reference to exhibits filed on November 10, 1993 with
      Registrant's Registration Statement on Form S-1, File No. 33-71506.
 (5)  Intentionally omitted.
 (6)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended June 30, 1995, as amended.
 (7)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1995.
 (8)  Intentionally omitted.
 (9)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended June 30, 1996, as amended.
(10)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended September 30, 1996, as amended.
(11)  Incorporated by reference to exhibits filed on June 30, 1997 with
      Registrant's Registration Statement on Form S-8, File No. 333-30365.
(12)  Incorporated by reference to exhibits filed with Registrant's
      Registration Statement on Form S-3, File No. 333-31843.
(13)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1997.
(14)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form S-3, File No. 333-49025.
(15)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form S-2, File No. 333-59053.
(16)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form  S-3, File No. 333-67023.
(17)  Incorporated by reference to exhibits filed on December 11, 1998 with
      Registrant's Current Report on Form 8-K.
(18)  Confidential treatment has been granted with respect to certain portions
      of these agreements.
(19)  Management contract or compensation plan.
(20)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1998.
(21)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended March 31, 1999.


(b) Financial Statement Schedules

   None.

Item 17. Undertakings.

   The undersigned Registrant hereby undertakes:

     (A) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:

     (1) to include  any  prospectus  required  by  Section  10(a)(3) of the
Securities Act;

     (2) to reflect in the prospectus any facts or events arising after the
effective date of the Registration Statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a
fundamental change in the information set forth in the Registration Statement.
Notwithstanding the foregoing, any increase or decrease in the volume of
securities offered (if the total dollar value of securities offered would not


                                      II-5
<PAGE>

exceed that which was registered) and any deviation from the low or high end of
the estimates maximum offering range may be reflected in the form of prospectus
filed with the commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than 20 percent change in the
maximum aggregate offering price set forth in the "Calculation Of Registration
Fee" table in the effective registration statement; and

     (3) to include any material information with respect to the plan of
distribution not previously disclosed in the Registration Statement or any
material change to such information in the Registration Statement; provided,
however, that paragraphs (1) and (2) do not apply if the information required to
be included in a post-effective amendment by these paragraphs is contained in
periodic reports filed with or furnished to the Commission by the Registrant
pursuant to Section 13 or Section 15(d) of the Exchange Act that are
incorporated by reference in the Registration Statement.

     (B) That, for the purpose of determining any liability under the Securities
Act, 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.

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

     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement 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.

   The undersigned Registrant hereby undertakes that:

     (1) For purposes 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 was declared effective.

     (2) For purposes 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 the offering of such securities at that time shall be deemed to
   be the initial bona fide offering thereof.


                                      II-6
<PAGE>


                                   SIGNATURES


   Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of South San
Francisco, State of California, on the 1st day of June, 1999.


                                       SHAMAN PHARMACEUTICALS, INC.


                                       By:/s/ Lisa A. Conte
                                          ------------------
                                          Lisa A. Conte





Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:



          Name                             Title                      Date
- --------------------------    -------------------------------     -------------
/s/ Lisa A. Conte
- --------------------------    Director, President, Chief          June 1, 1999
    Lisa A. Conte             Executive Officer and Chief
                              Financial Officer, (Principal
                              Executive Officer and Principal
                              Financial and Accounting Officer)
/s/ G. Kirk Raab*
- --------------------------    Chairman of the Board               June 1, 1999
    G. Kirk Raab


/s/ Adrian D.P. Bellamy*
- --------------------------    Director                            June 1, 1999
    Adrian D.P. Bellamy

/s/ Jeffrey Berg*
- --------------------------    Director                            June 1, 1999
    Jeffrey Berg

/s/ Herbert H. McDade, Jr.*
- --------------------------    Director                            June 1, 1999
    Herbert H. McDade, Jr.

/s/ M. David Titus*
- --------------------------    Director                            June 1, 1999
    M. David Titus


 --------------------------   Director                            June _, 1999
    Loren D. Israelsen

    *By:/s/ Lisa Conte
 --------------------------
 Lisa Conte, Attorney-in-fact



                                      II-7
<PAGE>


                                 EXHIBIT INDEX


 Exhibit
 Number                             Description
- --------     -------------------------------------------------------------------
 3.1*        Amended and Restated Certificate of Incorporation, as filed with
             the Delaware Secretary of State on March 11, 1999.
 3.2(9)      Amended and Restated Bylaws, as amended March 29, 1996.
 4.1***      Form of  Certificate of Designation of Preferences of Series R
             Preferred Stock of the Registrant
 4.2(21)     Form of warrant, dated April 5, 1999, issued to certain investors
             of the Registrant.
 4.3(21)     Form of warrant, dated April 30, 1999, issued to MMC/GATX
             Partnership No.1
 4.4***      Form of Subscription Agreement
 4.5***      Form of Instructions to Stockholders
 4.6***      Form of Letter to Common Stockholders of Record
 4.7***      Form of Letter to Banks and Brokers
 4.8***      Form of Letter to Beneficial Common Stockholders
 5.1***      Opinion of Brobeck, Phleger & Harrison LLP.
10.1(1)(19)  401(k) Plan.
10.2(1)(19)  Form of Stock Purchase Agreement.
10.3(1)      Form of Indemnification Agreement.
10.4(1)      Form of Agreement with Scientific Strategy Team Members.
10.5(1)      Form of Proprietary Information and Inventions Agreement-Employees.
10.6(1)      Form of Proprietary Information and Inventions
             Agreement-Consultants.
10.7(1)(18)  License  Agreement dated February 8, 1990,  between Shaman and
             Dr. Michael Tempesta.
10.8(1)(18)  Stock Purchase Agreement dated June 15, 1990, between Shaman
             and Lisa A. Conte.
10.9(1)      Master Equipment Lease Agreement dated December 26, 1990, between
             Shaman and Lease Management Services, Inc.
10.10(1)(18) Supply Agreement dated June 1, 1992.
10.11(1)     Registration Rights Agreement dated October 22, 1992, as amended
             December 14, 1992, between Shaman and certain holders of preferred
             stock of Shaman.
10.12(1)     Industrial Lease Agreement dated January 1, 1993, between Shaman
             and Grand/ Roebling Investment Company.
10.13(4)     Loan and Security Agreement dated September 27, 1993, between
             Shaman and Household Commercial of California.
10.14(4)     Common Stock Warrant dated September 30, 1993, issued to
             MMC/GATX Partnership No. I.
10.15(4)     Common Stock Warrant dated October 5, 1993, issued to Meier
             Mitchell & Co.
10.16(6)(18) Joint Research and Product Development Agreement, dated May 24,
             1995, by and between Ono Pharmaceutical Co., Ltd. and Registrant.
10.17(a)(10) Amendment Agreement, dated December 4, 1996, to the Joint Research
             and Product Development Agreement by and between Ono Pharmacetical
             Co., Ltd. and Registrant.
10.18(6)(18) License Agreement, dated June 8, 1995, by and between Bayer AG and
             Registrant.
10.19(7)(18) Development Agreement, dated January 11, 1996, by and between
             Abbott Laboratories and Registrant.
10.20(9)(18) Subscription Agreement dated July 25, 1996 by and between the
             Registrant and Fletcher International Limited.
10.21(10)(18)Joint Research and Product Development and Commercialization
             Agreement dated September 23, 1996, by and between Lipha,
             Lyonnaise Industrielle Pharmaceutique S.A. and the Registrant.



                                      II-8
<PAGE>


10.22(10)(18)Stock Purchase Agreement dated September 23, 1996, by and between
             Lipha, Lyonnaise Industrielle Pharmaceutique S.A. and the
             the Registrant.
10.23(11)(19)Shaman Pharmaceuticals, Inc. 1992 Stock Option Plan (as Amended and
             Restated on February 14, 1997).
10.24(3)(19) Form of Notice of Grant with Stock Option Agreement.
10.25(3)(19) Form of Addendum to Stock Option Agreement (Special Tax Elections).
10.26(3)(19) Form of Addendum to Stock Option Agreement (Limited Stock
             Appreciation Rights).
10.27(11)(19)Form of Non-Employee Director Automatic Stock Option Agreement.
10.28(12)    Masopracol License Agreement, dated as of March 19, 1997, by
             and between Access Pharmaceuticals, Inc. and the Registrant.
10.29(12)(18)Amended and Restated Masopracol License Agreement, dated as
             of April 1997, by and between Access Pharmaceuticals, Inc. and
             the Registrant.
10.30(12)    Loan and Security Agreement, dated as of May 7, 1997, between
             MMC/GATX Partnership I and Registrant.
10.30A(12)   Amendment No. 1 to Loan and Security Agreement, dated as of
             June 30, 1997, by and between Registrant and MMC/GATX
             Partnership No. I.
10.30B(15)   Waiver letter dated July 16, 1998, executed by Shaman
             Pharmaceuticals, Inc. and approved by MMC/GATX Partnership
             No. I as to the payment of dividends on the Series C  Preferred
             Stock.
10.30C (21)  Amendment No. 2 to Loan and Security Agreement, dated as of
             April 30, 1999, by and between the Registrant and MMC/GATX
             Partnership No. 1.
10.31(12)    Secured Promissory Note, dated May 16, 1997, issued in favor
             of MMC/GATX Partnership No. I.
10.32(12)    Warrant, granted May 7, 1997, in favor of MMC/GATX
             Partnership No. I.
10.33(12)    Amendment to Warrants, dated May 7, 1997, MMC/GATX Partnership
             No. I and Registrant.
10.34(12)    Engagement Agreement, dated April 7, 1997, by and between
             Registrant and Diaz & Altschul Capital, LLC.
10.35(12)    Amended Engagement Agreement, dated June 30, 1997, by and between
             Registrant and Diaz & Altschul Capital, LLC.
10.36(12)    Form of Note Purchase Agreement, dated as of June 30, 1997, by and
             between Registrant and certain investors.
10.37(13)    Master Lease Agreement, dated September 15, 1997, between
             Registrant and Transamerica Business Credit Corporation, with
             related schedules.
10.38(13)    Amendment to Note Purchase Agreement, dated as of June 30, 1997, by
             and between Registrant and Certain investors.
10.39(14)    Amendment Agreement, dated as of March 18, 1998, by and between the
             Registrant and certain investors.
10.40(14)    Form of Common Stock Purchase Warrant, dated as of March 18, 1998,
             issued to certain investors.
10.41(14)    Second Amendment Agreement, dated as of June 10, 1998, by and
             between the Registrant and certain investors.
10.42(17)    Exchange Agreement, dated as of December 10, 1998, by and between
             Registrant and certain entities.
10.43(19)    Common Stock Purchase Agreement dated as of November 18, 1998.
10.44(19)(20)Employment Agreement dated as of April 1, 1998, by and between
             Registrant and John W.S. Chow.
10.45(19)(20)Promissory Note dated as of  June 17, 1998, by and between
             Registrant and John W.S. Chow.
10.46(20)    Development and Commercial Supply Agreement, dated as of December
             1, 1998, by and between Registrant and NYComed Inc.
10.47(21)    Form of Credit Facility and Note Purchase Agreement, dated as of
             April 5, 1999, by and between the Registrant and the Investors
             named therein.
10.47A(21)   Amendment No. 1 to Credit Facility and Note Purchase Agreement,
             dated as of April 13, 1999, by and between the Registrant and the
             Investors named in the Credit Facility and Note Purchase Agreement.



                                      II-9
<PAGE>


10.47B(21)   Amendment No. 2 to Credit Facility and Note Purchase Agreement,
             dated as of April 30, 1999, by and between the Registrant and the
             Investors named in the Credit Facility and Note Purchase Agreement.
23.1**       Consent of Ernst & Young LLP, Independent Auditors.
23.2***      Consent of Brobeck, Phleger & Harrison LLP (included in the opinion
             filed as Exhibit 5.1).
24.1*        Power of Attorney (included under the caption "Signatures").
27.1 (20)    Financial Data schedule for period ended December 31, 1998.
27.2 (21)    Financial Data schedule for period ended March 31, 1999.
- ----------

*   Previously filed.
**  Filed herewith.
*** To be filed by amendment.

 (1)  Incorporated by reference to exhibits filed with the Registrant's
      Registration Statement on Form S-1, File No. 33-55892 which was declared
      effective January 26, 1993.
 (2)  Intentionally omitted.
 (3)  Incorporated by reference to exhibits filed on July 23, 1993 with
      Registrant's Registration Statement on Form S-8, File No. 33-66450.
 (4)  Incorporated by reference to exhibits filed on November 10, 1993 with
      Registrant's Registration Statement on Form S-1, File No. 33-71506.
 (5)  Intentionally omitted.
 (6)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended June 30, 1995, as amended.
 (7)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1995.
 (8)  Intentionally omitted.
 (9)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended June 30, 1996, as amended.
(10)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended September 30, 1996, as amended.
(11)  Incorporated by reference to exhibits filed on June 30, 1997 with
      Registrant's Registration Statement on Form S-8, File No. 333-30365.
(12)  Incorporated by reference to exhibits filed with Registrant's
      Registration Statement on Form S-3, File No. 333-31843.
(13)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1997.
(14)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form S-3, File No. 333-49025.
(15)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form S-2, File No. 333-59053.
(16)  Incorporated by reference to exhibits filed with Registrant's Registration
      Statement on Form  S-3, File No. 333-67023.
(17)  Incorporated by reference to exhibits filed on December 11, 1998 with
      Registrant's Current Report on Form 8-K.
(18)  Confidential treatment has been granted with respect to certain portions
      of these agreements.
(19)  Management contract or compensation plan.
(20)  Incorporated by reference to exhibits filed with Registrant's Annual
      Report on Form 10-K for the year ended December 31, 1998.
(21)  Incorporated by reference to exhibits filed with Registrant's Quarterly
      Report on Form 10-Q for the quarter ended March 31, 1999.



                                      II-10

<PAGE>

                                                                 EXHIBIT 23.1

               Consent of Ernst & Young LLP, Independent Auditors


     We consent to the reference to our firm under the caption  "Experts" and to
the use of our report dated February 11, 1999 (except for Note 10, as to which
the date is June __, 1999), in Amendment No. 1 to the Registration Statement
(Form S-1) and related Prospectus of Shaman Pharmaceuticals, Inc. for the
registration of 7,500,000 shares of its Series R Convertible Preferred Stock,
7,500,000 rights to purchase its Series R Convertible Preferred Stock, and
50,000 shares of its common stock.



Palo Alto, California

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


The foregoing consent is in the form that will be signed upon the completion of
the one-for-twenty reverse stock split described in Note 10 to the financial
statements.




/s/ Ernst & Young LLP
Palo Alto, California
June 1, 1999






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