TRIANGLE PHARMACEUTICALS INC
S-3, 1998-01-23
PHARMACEUTICAL PREPARATIONS
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<PAGE>
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 23, 1998
                                                       REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                         SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, D.C.  20549
                                   _____________

                                      FORM S-3
                               REGISTRATION STATEMENT
                                       UNDER
                             THE SECURITIES ACT OF 1933

                           TRIANGLE PHARMACEUTICALS, INC.
               (Exact name of Registrant as Specified in Its Charter)

               DELAWARE                              56-1930728
      (State or Other Jurisdiction                (I.R.S. Employer
     of Incorporation or Organization)            Identification No.)

                                 4 UNIVERSITY PLACE
                               4611 UNIVERSITY DRIVE
                           DURHAM, NORTH CAROLINA, 27707
                                   (919) 493-5980
          (Address, Including Zip Code and Telephone, Including Area Code,
                    of Registrant's Principal Executive Offices)

                                DAVID W. BARRY, M.D.
                        CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                           TRIANGLE PHARMACEUTICALS, INC.
                     4 UNIVERSITY PLACE, 4611 UNIVERSITY DRIVE
                   DURHAM, NORTH CAROLINA, 27707, (919) 493-5980
             (Name, Address, Including Zip Code and Telephone Number,
                     Including Area Code, of Agent for Service)

                                     Copies To:
                              JOHN A. DENNISTON, ESQ.
                                 JOHN R. COOK, ESQ.
                          BROBECK, PHLEGER & HARRISON LLP
                           550 WEST C STREET, SUITE 1300
                            SAN DIEGO, CALIFORNIA 92101
                                   (619) 234-1966

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effective date of this Registration Statement.

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

     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, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

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

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

<PAGE>

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


<TABLE>
<CAPTION>

                      CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
<S>
                                                                    PROPOSED         PROPOSED
                                                    AMOUNT          MAXIMUM          MAXIMUM          AMOUNT OF
TITLE OF EACH CLASS OF SECURITIES                   TO BE        OFFERING PRICE     AGGREGATE       REGISTRATION
TO BE REGISTERED                                  REGISTERED      PER SHARE (1)  OFFERING PRICE (1)      FEE
- ------------------------------------------------------------------------------------------------------------------
<S>                                               <C>            <C>             <C>                <C>
Common Stock, $0.001 par value per share....      2,789,500 (2)       $16.94         $47,254,130       $13,940
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Estimated solely for the purpose of computing the amount of the
     registration fee in accordance with Rule 457 (c) under the Securities Act
     of 1933.

(2)  This Registration Statement shall also cover any additional shares of
     Common Stock which become issuable in connection with the shares registered
     for sale hereby as a result of any stock dividend, stock split,
     recapitalization or other similar transaction effected without the receipt
     of consideration which results in an increase in the number of the
     Registrant's outstanding shares of Common Stock.

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 THAT 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.


                                          ii

<PAGE>


                   PRELIMINARY PROSPECTUS DATED JANUARY 23, 1998
                               SUBJECT TO COMPLETION

                           TRIANGLE PHARMACEUTICALS, INC.

                          2,789,500 SHARES OF COMMON STOCK

     This Prospectus relates to the offer and sale, which is not being
underwritten, by certain stockholders (the "Selling Stockholders") of Triangle
Pharmaceuticals, Inc. and its subsidiaries (collectively, the "Company" or
"Triangle") of up to 2,789,500 shares of Common Stock, $.001 par value per
share, of the Company (the "Shares"). The Selling Stockholders acquired
2,000,000 of the Shares (the "Restricted Shares") directly from the Company
pursuant to a private placement completed on June 6, 1997 and acquired the
balance, 789,500 Shares, either directly from the underwriters in the Company's
initial public offering or in the over-the-counter market in routine brokerage
transactions. See "Selling Stockholders."

     The Shares may be offered by the Selling Stockholders from time to time in
transactions on the Nasdaq National Market, in privately negotiated transactions
or a combination of such methods of sale, at fixed prices which may be changed,
at market prices prevailing at the time of sale, at prices related to such
prevailing market prices or at negotiated prices. The Selling Stockholders may
effect such transactions by selling the Shares to or through broker-dealers, and
such broker-dealers may receive compensation in the form of discounts,
concessions or commissions from the Selling Stockholders or the purchasers of
the Shares for whom such broker-dealers may act as agent or to whom they sell as
principal or both (which compensation to a particular broker-dealer might be in
excess of customary commissions). See "Selling Stockholders" and "Plan of
Distribution."

     None of the proceeds from the sale of the Shares by the Selling
Stockholders will be received by the Company. The Company has agreed to bear
certain expenses (other than underwriting discounts and commissions, brokerage
commissions and fees and expenses, if any, of counsel to the Selling
Stockholders) in connection with the registration of the Shares being offered by
the Selling Stockholders. Such expenses are estimated to be approximately
$40,000. The Company has agreed also to indemnify the Selling Stockholders
against certain liabilities, including certain liabilities under the Securities
Act of 1933, as amended (the "Securities Act").  See "Plan of Distribution."

     The Common Stock of the Company is traded on the Nasdaq National Market
under the symbol "VIRS." The last reported sales price of the Company's Common
Stock on the Nasdaq National Market on January 22, 1998 was $17.125 per share.


     The Selling Stockholders and any broker-dealers, agents or underwriters
that participate with the Selling Stockholders in the distribution of Shares may
be deemed to be "underwriters" within the meaning of Section 2(11) of the
Securities Act and any commissions received by them and any profit on the resale
of the Shares purchased by them may be deemed to be underwriting commissions or
discounts under the Securities Act.  See "Plan of Distribution."

                                    -----------

THE SHARES OFFERED INVOLVE A HIGH DEGREE OF RISK.  SEE "RISK FACTORS" COMMENCING
ON PAGE 5 FOR A DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED BY
PROSPECTIVE PURCHASERS OF THE SECURITIES OFFERED HEREBY.

                                    -----------

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


                THE DATE OF THIS PROSPECTUS IS JANUARY 23, 1998

<PAGE>

                               AVAILABLE INFORMATION

     The Company is subject to the reporting requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information may be inspected at the Commission's Public
Reference Section, Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, as
well as at the Commission's regional offices at 7 World Trade Center, 13th
Floor, New York, New York 10048; and at Citicorp Center, 500 West Madison
Street, Room 1400, Chicago, Illinois 60661-2511. Copies of such material can
also be obtained at prescribed rates at the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549. In addition, the
Commission maintains a World Wide Web site on the Internet at http://www.sec.gov
that contains reports, proxy and information statements and other information
regarding registrants that file electronically with the Commission.

     The Company has filed with the Commission a Registration Statement on Form
S-3 under the Securities Act with respect to the Shares being offered hereby of
which this Prospectus is a part. This Prospectus does not contain all of the
information set forth in the Registration Statement, certain portions of which
are omitted in accordance with the rules and regulations of the Commission. For
further information pertaining to the Company and the Shares, reference is made
to the Registration Statement and the exhibits and schedules thereto, which may
be inspected without charge at, and copies thereof may be obtained at prescribed
rates from, the office of the Commission at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549.

     The Company's Common Stock is quoted on the Nasdaq National 
Market under the symbol "VIRS." Reports, proxy and information statements and 
other information about the Company may be inspected at the Nasdaq National 
Market, 1735 K Street, N.W., Washington, DC 20006-1506.

                       INFORMATION INCORPORATED BY REFERENCE

    The following documents filed by the Company with the Commission are hereby
incorporated by reference in this Prospectus:

     1.  The Annual Report of the Company on Form 10-K for the fiscal year ended
December 31, 1996;

     2.  The Quarterly Reports of the Company on Form 10-Q for the quarterly
periods ended March 31, 1997, June 30, 1997 and September 30, 1997;

     3.  The Current Report of the Company on Form 8-K filed June 18, 1997;

     4.  The Current Report of the Company on Form 8-K filed September 11, 1997,
as amended on Form 8-K/A filed November 12, 1997; and

     5.  The description of the Company's Common Stock contained in its
Registration Statement on Form 8-A filed on October 18, 1996.

     All reports and other documents subsequently filed by the Company pursuant
to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Prospectus and prior to the termination of this offering shall be deemed to be
incorporated by reference herein and to be a part hereof from the date of filing
of such reports and documents. Any statement incorporated herein shall be deemed
to be modified or superseded for purposes of this Prospectus to the extent that
a statement contained herein or in any other subsequently filed document which
also is or is deemed to be incorporated by reference herein modifies or
supersedes such statement. Any statement so modified or superseded shall not be
deemed, except as so modified or superseded, to constitute a part of this
Prospectus.

     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon written or oral request of such person, a copy of
any or all of the foregoing documents incorporated herein by
reference (other than exhibits to such documents, unless such exhibits are
specifically incorporated by reference into any such document). Requests for
such documents should be submitted in writing to Chris A. Rallis, Vice
President, Business Development, General Counsel and Secretary, at Triangle
Pharmaceuticals, Inc., 4 University Place, 4611 University Drive, Durham, North
Carolina, 27707 or by telephone at (919) 493-5980.


                                          2
<PAGE>

     NO PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR MAKE ANY REPRESENTATION NOT CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS, AND ANY INFORMATION NOT CONTAINED OR INCORPORATED
HEREIN MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER
TO BUY, BY ANY PERSON IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL FOR SUCH
PERSON TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS
PROSPECTUS AT ANY TIME NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, IMPLY THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY DATE
SUBSEQUENT TO THE DATE HEREOF.

     Triangle Pharmaceuticals is a trademark of the Company. This Prospectus
also includes names and trademarks of companies other than the Company.


                                          3
<PAGE>


                                    THE COMPANY

     THIS PROSPECTUS MAY CONTAIN, IN ADDITION TO HISTORICAL INFORMATION,
FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF SECTION 27A OF THE SECURITIES
ACT AND SECTION 21E OF THE EXCHANGE ACT THAT INVOLVE RISKS AND UNCERTAINTIES.
THE COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE PROJECTED IN THE
FORWARD-LOOKING STATEMENTS. FACTORS THAT COULD CAUSE OR CONTRIBUTE TO SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED IN THE SECTION
ENTITLED "RISK FACTORS," AS WELL AS THOSE DISCUSSED ELSEWHERE IN THIS PROSPECTUS
OR DOCUMENTS INCORPORATED BY REFERENCE HEREIN.  THE COMPANY UNDERTAKES NO
OBLIGATION TO RELEASE PUBLICLY THE RESULTS OF ANY REVISIONS TO THESE
FORWARD-LOOKING STATEMENTS TO REFLECT EVENTS OR CIRCUMSTANCES ARISING AFTER THE
DATE HEREOF.

GENERAL

     Triangle is a pharmaceutical company engaged in the development of new drug
candidates primarily in the antiviral area, with a particular focus on therapies
for the human immunodeficiency virus ("HIV"), including the acquired
immunodeficiency syndrome ("AIDS"), and the hepatitis B virus ("HBV").  Prior to
their employment with the Company, members of the Company's management team
played instrumental roles in the identification, clinical development and
commercialization of several leading antiviral therapies.

     The Company has an existing portfolio consisting of seven licensed drug
candidates and one drug candidate for which the Company has an option to acquire
a license. In laboratory tests, five of the eight drug candidates inhibit the
growth of HIV, and two of these five also inhibit the growth of HBV. The other
three drug candidates have demonstrated preclinical activity against certain
cancers, herpes infections and psoriasis. The Company's drug candidates are in
various phases of preclinical or clinical development.  The Company believes
that some of its drug candidates may meet the criteria established by the United
States Food and Drug Administration ("FDA") for accelerated approval. If so, the
Company may be able to commercialize these drug candidates in a shorter time
period than has historically been required for drugs that do not meet the
criteria for accelerated approval. There can be no assurance, however, that the
Company's drug candidates will qualify for accelerated approval or be approved
in a time period that is shorter than would be historically expected.

     Treatment of HIV using combinations of drugs (coactive therapy) has 
recently shown significant clinical benefits including reducing virus levels 
and increasing patient longevity.  The Company was founded based in part on 
the management team's belief that the prolonged use of coactive therapy will 
generate demand for new anti-HIV drugs with favorable resistance and 
tolerance profiles. The Company believes the use of anti-HIV drugs will 
increase because it anticipates that (i) the use of multiple drugs in 
individual patients on coactive therapy will increase, (ii) large numbers of 
previously untreated patients will begin to seek medical care as the benefits 
of coactive therapy become more widely understood and (iii) patient longevity 
will increase and thus lengthen the duration of drug therapy.

     Triangle intends to maintain a limited corporate infrastructure that is
focused on drug development. The Company does not intend to engage in drug
discovery, but instead to focus on drug development, thereby avoiding much of
the significant investment of time and capital that is generally required before
a compound is identified and brought to clinical trials. The Company intends to
use its expertise to perform internally what it believes are the most critical
aspects of the development process, such as the design of clinical trials and
the optimization of drug synthesis. The Company plans to out-source the conduct
of clinical trials and many aspects of the manufacture of drug substance to
carefully selected third parties. The Company believes that the high
concentration of major prescribers of anti-HIV therapies in the United States
will enable the Company to promote most drug candidates that are successfully
developed to these prescribers through a small, direct sales force. The Company
does not currently have a sales force.

    Triangle is a development stage company, has not received any revenues from
the sale of products, and does not expect any of its drug candidates to be
commercially available for at least the next several years.  Since its inception
on July 12, 1995, the Company's operating activities have related primarily to
recruiting personnel, negotiating license and option arrangements for its drug
candidates, raising capital and developing the Company's drug candidates.  The
Company has been unprofitable since its inception and expects to incur
substantial and


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<PAGE>

increasing losses for at least the next several years, due primarily to the
expansion of its drug development programs. The Company expects that losses will
fluctuate from period to period and that such fluctuations may be substantial.
There can be no assurance that the Company will ever achieve profitable
operations.  See "Risk Factors--History of Operating Losses; Accumulated
Deficit; Uncertainty of Future Profitability."

     The Company was incorporated in Delaware in July 1995.  The Company's
principal executive offices are located at 4 University Place, 4611 University
Drive, Durham, North Carolina  27707, and its telephone number is (919)
493-5980.


                                    RISK FACTORS

     AN INVESTMENT IN THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF
RISK.  IN ADDITION TO THE OTHER INFORMATION CONTAINED IN THIS PROSPECTUS,
PROSPECTIVE INVESTORS SHOULD CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS
BEFORE PURCHASING THE COMMON STOCK OFFERED HEREBY.


DEVELOPMENT STAGE COMPANY; UNCERTAINTY OF PRODUCT DEVELOPMENT

     Triangle was incorporated in July 1995 and accordingly has only a limited
operating history upon which an evaluation of the Company's business and
prospects can be based.  In addition, the Company's drug candidates are all in
the early developmental stage and require significant, time consuming and costly
development, testing and regulatory clearances.  The Company does not expect any
of its drug candidates to be commercially available for at least the next
several years.  The successful development of any new drug, including any of the
Company's drug candidates, is highly uncertain and is subject to a number of
significant risks.  These risks include, among others, the possibility that any
or all of the Company's drug candidates will be found to be ineffective, toxic
or otherwise fail to receive necessary regulatory clearances; that the drug
candidates will be uneconomical to manufacture, market or will not achieve broad
market acceptance; that third parties will hold proprietary rights that will
preclude the Company from marketing the drug candidates; or that third parties
will market equivalent or superior products.  The failure of the Company's drug
development programs to result in commercially viable products would have a
material adverse effect on the Company.

HISTORY OF OPERATING LOSSES; ACCUMULATED DEFICIT; UNCERTAINTY OF FUTURE
PROFITABILITY

     The Company has incurred losses since its inception. As of September 30,
1997, the Company's consolidated accumulated deficit was approximately $39.3
million. Losses have resulted principally from costs incurred in the acquisition
and development of the Company's drug candidates and general and administrative
costs.  These costs have exceeded the Company's revenues, which to date have
been generated primarily from interest income. The Company has not generated any
revenue to date from the sale of drugs and does not expect to do so for at least
the next several years. The Company expects to incur significant additional
operating losses over the next several years and expects losses to increase as
the Company's drug development efforts expand. The Company's ability to achieve
profitability will depend upon its ability to develop and obtain regulatory
approval for its drug candidates and to develop the capacity (or establish
relationships with third parties) to manufacture, market and sell any drug
candidates it successfully develops. There can be no assurance that the Company
will ever generate significant revenues or achieve profitable operations.

FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING

     The Company's drug development programs currently require and will in the
future require substantial capital expenditures, including expenditures for
preclinical testing, chemical synthetic scale up, clinical trials of drug
candidates and payments to the Company's licensors. The Company's future capital
requirements will depend on many factors, including the progress of the
Company's drug development programs, the magnitude of these programs, the scope
and results of preclinical testing and clinical trials, the cost, timing and
outcome of regulatory reviews, the costs under the license and/or option
agreements relating to the Company's drug candidates, the costs of seeking and
maintaining patent protection for the Company's drug candidates, administrative
and legal expenses,


                                          5
<PAGE>

the establishment of capacity for sales and marketing functions, the
establishment of relationships with third parties for manufacturing and sales
and marketing functions, and other factors. The Company expects that its capital
requirements will increase significantly in the future.

     The Company has incurred negative cash flow from operations since inception
and does not expect to generate positive cash flow to fund its operations for at
least the next several years. As a result, the Company believes that substantial
additional equity or debt financings will be required to fund its operations.
There can be no assurance that the Company will be able to consummate any such
financings at all or on favorable terms, or that such financings will be
adequate to meet the Company's capital requirements. Any additional equity or
convertible debt financings could result in substantial dilution to the
Company's stockholders. If adequate funds are not available, the Company may be
required to delay, reduce the scope of or eliminate one or more of its drug
development programs or attempt to continue development by entering into
arrangements with collaborative partners or others that may require the Company
to relinquish some or all of its rights to certain technologies or drug
candidates that the Company would not otherwise desire to relinquish. In
addition, from time to time, the Company considers the acquisition of
technologies and drug candidates that, if completed, could increase the
Company's capital requirements. The Company's inability to fund its capital
requirements would have a material adverse effect on the Company.

UNCERTAINTIES RELATED TO CLINICAL TRIALS

     Before obtaining required regulatory approvals for the commercial sale of
any of its drug candidates under development, the Company must demonstrate
through preclinical testing and clinical trials that each product is safe and
effective for use in each target indication. The results from preclinical
testing and early clinical trials may not be predictive of results that will be
obtained in pivotal clinical trials, and there can be no assurance that the
Company's clinical trials will demonstrate sufficient safety and effectiveness
to obtain required regulatory approvals or will result in marketable products.
A number of companies in the pharmaceutical industry have suffered significant
setbacks in advanced clinical trials, even after promising results in earlier
trials. The administration of any drug candidate developed by the Company may
produce undesirable side effects in humans.  The occurrence of side effects
could interrupt, delay or halt clinical trials of such drug candidate and could
ultimately prevent its approval by the United States Food and Drug
Administration ("FDA") or foreign regulatory authorities for any and all
targeted indications.  The Company or the FDA may suspend or terminate clinical
trials at any time if it is believed that the trial participants are being
exposed to unacceptable health risks.  There can be no assurance that clinical
trials will demonstrate that any drug candidate under development by the Company
is safe or effective.

     The rate of completion of the Company's clinical trials will depend upon,
among other factors, obtaining adequate clinical supplies and the rate of
patient enrollment. Patient enrollment is a function of many factors, including
the size of the patient population, the nature of the protocol, the proximity of
patients to clinical sites and the eligibility criteria for the study. Delays in
planned patient enrollment can result in increased costs or delays or both,
which could have a material adverse effect on the Company. There can be no
assurance that if clinical trials are successfully completed, the Company will
be able to submit a New Drug Application ("NDA") in a timely manner or that any
such application will be approved by the FDA. Any failure of the Company to
complete successfully its clinical trials and obtain approvals of corresponding
NDAs would have a material adverse effect on the Company.

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

     The Company's success will depend in large part on the ability of the
Company and its licensors to obtain patent protection with respect to its drug
candidates, defend patents once obtained, maintain trade secrets and operate
without infringing upon the patents and proprietary rights of others and to
obtain appropriate licenses to patents or proprietary rights held by third
parties, both in the United States and in foreign countries. The Company has no
patents in its own name and has only one patent application of its own pending,
but has obtained licenses to patents, patent applications and other proprietary
rights from third parties with respect to each of the Company's eight drug
candidates.


                                          6
<PAGE>

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

     A number of pharmaceutical companies, biotechnology companies, universities
and research institutions have filed patent applications or received patents to
technologies that cover or are similar to the technologies licensed by the
Company. The Company is aware of certain patent applications previously filed by
and patents already issued to others that conflict with patents or patent
applications licensed to the Company either by claiming the same methods or
compounds or by claiming methods or compounds that could dominate those licensed
to the Company. In addition, there can be no assurance that the Company is aware
of all patents or patent applications that may materially affect the Company's
ability to make, use or sell any drug candidates that are successfully
developed. United States patent applications are confidential while pending in
the United States Patent and Trademark Office ("PTO"), and patent applications
filed in foreign countries are often first published six months or more after
filing. Any conflicts resulting from third party patent applications and patents
could significantly reduce the coverage of the patents licensed to the Company
and limit the ability of the Company or its licensors to obtain meaningful
patent protection. If patents are issued to other companies that contain
competitive or conflicting claims, the Company may be required to obtain
licenses to these patents or to develop or obtain alternative technology. There
can be no assurance that the Company will be able to obtain any such license on
acceptable terms or at all. If such licenses are not obtained, the Company could
be delayed in or prevented from pursuing the development or commercialization of
its drug candidates, which would have a material adverse effect on the Company.

     The Company is aware of significant risks regarding the patent rights
licensed by the Company relating to three of the eight compounds comprising the
Company's existing drug candidate portfolio. The Company may not be able to
commercialize FTC, DAPD or CS-92 for HIV and/or  HBV due to patent rights held
by third parties other than the Company's licensors. The Company is aware of
numerous patent applications and issued patents in the United States and
numerous foreign countries held by third parties other than the Company's
licensors that relate to these compounds and their use alone or with other
compounds to treat HIV and HBV. As a result, the positions of the Company and
its licensors with respect to the use of FTC, DAPD and CS-92 to treat HIV and/or
HBV are highly uncertain and involve numerous complex legal and factual
questions that are unknown or unresolved. If any of these questions is resolved
in a manner that is not favorable to the Company's licensors or the Company, the
Company would not have the right to commercialize FTC, DAPD and/or CS-92 in the
absence of a license from one or more third parties, which may not be available
on acceptable terms or at all. In addition, even in the absence of an
unfavorable resolution of any of these questions, the Company may attempt to
obtain licenses from one or more third parties in order to reduce or eliminate
the risks relating to some or all of these matters. There can be no assurance
that the Company will elect to obtain any such licenses or that such licenses
will be available on acceptable terms or at all. The Company's inability to
commercialize any of these compounds would have a material adverse effect on the
Company.

     FTC

     FTC belongs to the same general class of nucleosides as 3TC, which  has
been approved in the United States by the FDA for use in combination with AZT
for the treatment of HIV and by similar regulatory agencies in Europe for use in
combination with other nucleoside analogues for the treatment of HIV. 3TC is
currently being sold by Glaxo Wellcome plc ("Glaxo") for the treatment of HIV
under a license agreement with BioChem Pharma Inc. ("BioChem Pharma"). The
Company obtained its rights to purified forms of FTC under a license from Emory
University ("Emory").  In 1990 and 1991, Emory filed in the United States and
thereafter in numerous foreign countries patent applications with claims to
composition of matter and methods to treat HIV and HBV with FTC. Yale University
("Yale") filed patent applications on FTC and its use to treat HBV in 1991 in
the United States, and


                                          7
<PAGE>

subsequently licensed its rights under those patent applications to Emory. The
Company's license arrangement with Emory includes all rights under the Yale
patent applications.

     HIV. Emory received a United States patent in 1993 covering a method to
treat HIV infection with FTC. BioChem Pharma filed a patent application in the
United States in 1989 and was issued a patent in 1991 covering a group of
nucleosides in the same general class as FTC, but which did not include FTC.
BioChem Pharma filed foreign patent applications in 1990 based upon its 1989
United States patent application, and in those foreign applications included FTC
among a large class of nucleosides. The foreign patent applications are pending
in a large number of countries, and have issued in a number of countries with
claims directed to FTC and its use to treat HIV. In addition, BioChem Pharma
filed a United States patent application in 1991 specifically directed to a
purified form of FTC that exhibits advantageous properties for the treatment of
HIV on which two patents have issued, one directed to the purified form of FTC
and another directed to a method for treating antiviral diseases with the
purified form of FTC.  The PTO has recently declared an interference between the
latter BioChem Pharma patent and a patent application filed by Emory. There can
be no assurance, however, that Emory will prevail in the interference
proceeding, or that the interference proceeding will not delay the decision of
the PTO regarding Emory's patent application.  BioChem Pharma has also filed
patent applications in a large number of foreign countries based upon its 1991
United States patent application, and patents have issued in certain countries.
BioChem Pharma may have additional patent applications pending in the United
States.

     In the United States, the first to invent a subject matter is entitled to
patent protection on that invention. With respect to patent applications filed
prior to January 1, 1996, United States patent law provides that if a party
invented a technology outside the United States, then for purposes of
determining the first to invent the technology, that party is deemed to have
invented the technology on the earlier of the date it introduced the invention
in the United States or the date it filed its patent application. In a
registration statement filed with the United States Securities and Exchange
Commission, BioChem Pharma stated that since it conducts substantially all of
its research activities outside the United States, it is at a disadvantage as to
inventions made prior to January 1, 1996 with respect to obtaining United States
patents as compared to companies that maintain research facilities in the United
States. The Company does not know whether Emory or BioChem Pharma was the first
to invent the subject matter claimed in their respective United States patent
applications or patents, or whether BioChem Pharma invented the technology
disclosed in its patent applications in the United States or introduced that
technology in the United States before the date of its patent applications. In
foreign countries, the first party to file a patent application on an invention,
not the first to invent the subject matter, is entitled to patent protection on
that invention. While the Company believes that Emory's patent applications that
disclosed FTC as a useful anti-HIV agent were filed in foreign countries before
BioChem Pharma filed its foreign patent applications on that subject matter,
BioChem Pharma has been issued patents in several foreign countries.  Further,
BioChem Pharma has filed for patent protection on FTC and its uses in certain
countries in which Emory did not file for patent protection.  There can be no
assurance that Emory will initiate or be successful in any foreign proceeding
attempting to revoke patents issued to BioChem Pharma or addressing the relative
rights of BioChem Pharma and Emory. BioChem Pharma has opposed patent claims on
FTC granted to Emory in Japan and Australia.  Emory has opposed patent claims on
FTC granted to BioChem Pharma in Norway.  There can be no assurance that BioChem
Pharma will not make additional challenges to any Emory patents or patent
applications, or that Emory will succeed in defending any such challenges. There
can be no assurance that the sale of FTC by the Company for the treatment of HIV
would not be held to infringe United States and foreign patent rights of BioChem
Pharma. Under the patent laws of most countries, a product can be found to
infringe a third party patent either if the third party patent expressly covers
the product or method of treatment using the product, or in certain
circumstances, if the third party patent, while not expressly covering the
product or method, covers subject matter that is substantially equivalent in
nature to the product or method. If it is determined that the sale of FTC for
the treatment of HIV infringes a BioChem Pharma patent, the Company would not
have the right to make, use or sell FTC for the treatment of HIV in one or more
countries in the absence of a license from BioChem Pharma. There can be no
assurance that the Company could obtain a license from BioChem Pharma on
acceptable terms or at all.

     HBV. Burroughs Wellcome Co. ("Burroughs Wellcome")  filed patent
applications in March and May 1991 in Great Britain on a method to treat HBV
with FTC. Burroughs Wellcome  filed similar patent applications in other
countries, which the Company believes includes the United States. Glaxo
subsequently acquired Burroughs

                                          8
<PAGE>


Wellcome's rights under those patent applications. Those applications were filed
in foreign countries prior to the date Emory filed its patent application on the
use of FTC to treat HBV, and therefore, the foreign patent applications filed by
Burroughs Wellcome have priority over those filed by Emory. In July 1996, Emory
instituted litigation against Glaxo in the United States District Court to
obtain ownership of the patent applications filed by Burroughs Wellcome,
alleging that Burroughs Wellcome converted and misappropriated Emory's invention
and property, and that an Emory employee is the inventor or a co-inventor of the
subject matter covered by the Burroughs Wellcome patent applications. There can
be no assurance that Emory will succeed in its efforts to establish ownership
rights. If Emory fails to establish ownership rights, the Company could not
make, use or sell FTC for the treatment of HBV in countries in which patents are
issued to Glaxo without a license from Glaxo. If Emory establishes only
co-ownership rights (and not sole ownership) to these patents and patent
applications, laws in Europe, Korea and perhaps other countries could prohibit
Emory from licensing any co-owned patent rights without Glaxo's consent. If the
Company is required to obtain a license from Glaxo to sell FTC for the treatment
of HBV, there can be no assurance that the Company would be able to obtain such
a license on acceptable terms or at all.

     BioChem Pharma filed a patent application in May 1991 in Great Britain also
directed to a method to treat HBV with FTC. BioChem Pharma filed similar patent
applications in other countries, and in January 1996 was issued a patent in the
United States. The PTO has recently declared an interference between the BioChem
Pharma patent and a patent application filed by Yale.  There can be no
assurance, however, that Yale will prevail in the interference proceeding, or
that the interference proceeding will not delay the decision of the PTO
regarding Yale's patent application.  In addition, Emory has informed the
Company that Emory intends to challenge BioChem Pharma's issued United States
patent. There can be no assurance that Emory will pursue or succeed in any such
proceeding. The Company cannot sell FTC for the treatment of HBV in the United
States unless the BioChem Pharma patent is held invalid by a United States court
or administrative body or unless the Company obtains a license from Biochem
Pharma. There can be no assurance that the Company would be able to obtain such
a license on acceptable terms or at all. In July 1991, BioChem Pharma was issued
a United States patent on the use of 3TC to treat HBV and has corresponding
applications pending or issued in foreign countries. If it is determined that
the use of FTC to treat HBV is not substantially different from the use of 3TC
to treat HBV, a court could hold that the use of FTC to treat HBV infringes
these BioChem Pharma 3TC patents.

     In addition, BioChem Pharma has filed in the United States and foreign
countries several patent applications on manufacturing methods relating to a
class of nucleosides that includes FTC. If the Company uses a manufacturing
method that is covered by patents issuing on any of these applications, the
Company would not be able to manufacture FTC without a license from BioChem
Pharma. There can be no assurance that the Company would be able to obtain such
a license on acceptable terms or at all.

     DAPD

     The Company obtained its rights to DAPD under a license from Emory and
University of Georgia Research Foundation, Inc. ("UGARF").  The DAPD portfolio
licensed to the Company consists of two issued United States patents and several
United States and foreign patent applications that cover a method for the
synthesis of DAPD and its use to treat HIV and HBV. Emory and UGARF filed patent
applications claiming these inventions in the United States in 1990, 1992 and
1993, respectively. BioChem Pharma filed a patent application in the United
States in 1988 on a group of nucleosides in the same general class as DAPD and
their use to treat HIV, and has filed corresponding patent applications in
foreign countries. The PTO issued a patent to BioChem Pharma in 1993 covering a
class of nucleosides that includes DAPD and its use to treat HIV. Corresponding
patents have been issued to BioChem Pharma in many foreign countries. Emory has
filed an opposition to BioChem Pharma's granted patent application in the
European Patent Office based, in part, upon Emory's assertion that BioChem
Pharma's patent does not disclose how to make DAPD, and Emory has informed the
Company that Emory intends to challenge BioChem Pharma's patents and patent
applications in other countries.  Patent claims granted to Emory on a portion of
the DAPD technology by the Australian Patent Office have been opposed by BioChem
Pharma. There can be no assurance that a court or administrative body would
invalidate BioChem Pharma's patent claims or that a sale of DAPD by the Company
would not infringe BioChem Pharma's patents. If Emory, UGARF and the Company do
not challenge, or are not successful in any challenge to, BioChem Pharma's
issued patents or pending patent applications (or patents that may issue as a
result of such applications), the Company will not be able to


                                          9
<PAGE>

manufacture, use or sell DAPD in the United States and any foreign countries in
which BioChem Pharma receives a patent without a license from BioChem Pharma.
There can be no assurance that the Company would be able to obtain a license
from BioChem Pharma on acceptable terms or at all.


     CS-92

     The Company obtained its rights to CS-92 under a license from Emory and
UGARF. Emory and UGARF have obtained two United States patents that cover CS-92
and its use to treat HIV, and have filed a European patent application and a
Japanese patent application with claims limited to the use of CS-92 as a method
for administering AZT, which includes the administration of CS-92 as a precursor
form of AZT, to treat HIV infection. Burroughs Wellcome filed an application
with the European Patent Office in September 1986 directed to a broad group of
nucleosides that includes CS-92, and their use to treat HIV infection. Burroughs
Wellcome subsequently filed similar applications in other countries, and the
Company believes Burroughs Wellcome filed a similar patent application in the
United States. Patents have been issued to Burroughs Wellcome in certain
countries based upon these patent applications. Glaxo now has the rights to
these patents and patent applications. There can be no assurance that, if
challenged, a court would uphold the Emory/UGARF patents in light of the
disclosures contained in the earlier filed Burroughs Wellcome patent
applications. In addition, CS-92 is metabolized to AZT in cell lines IN VITRO,
and based on that, the Company believes that it may likewise be converted to AZT
IN VIVO. A court could hold that United States and foreign patents owned by
Glaxo covering the use of AZT to treat HIV infection would be infringed by the
sale of CS-92 to treat HIV infection. If the use of CS-92 is found to infringe
the patents owned by Glaxo, then the Company would not have the right to sell
CS-92 in one or more countries without a license from Glaxo. There can be no
assurance that the Company would be able to obtain a license from Glaxo on
acceptable terms or at all.

     Litigation, which could result in substantial cost to the Company, may also
be necessary to enforce any patents to which the Company has rights or to
determine the scope, validity and enforceability of other parties' proprietary
rights, which may affect the Company's drug candidates and technology. United
States patents carry a presumption of validity and generally can be invalidated
only through clear and convincing evidence. The Company's licensors may also
have to participate in interference proceedings declared by the PTO to determine
the priority of an invention, which could result in substantial cost and/or
delays to the Company.  As indicated above, one interference has already been
declared by the PTO in connection with the FTC technology.  There can be no
assurance that the Company's licensed patents would be held valid by a court or
administrative body or that an alleged infringer would be found to be
infringing. Further, with respect to the drug candidates licensed or optioned by
the Company from Emory, UGARF and the Regents of the University of California
("Regents"), and The Dupont Merck Pharmaceutical Company ("Dupont Merck"),
Emory, UGARF, the Regents and Dupont Merck are primarily responsible for any
litigation, interference, opposition or other action pertaining to patents or
patent applications related to the licensed technology and the Company is
required to reimburse them for the costs they incur in performing these
activities. As a result, the Company generally does not have the ability to
institute or determine the conduct of any such patent proceedings unless Emory,
UGARF and/or the Regents and/or Dupont Merck do not elect to institute or elect
to abandon such proceedings. In cases where Emory, UGARF and/or the Regents
and/or Dupont Merck elect to institute and prosecute patent proceedings, the
Company's rights will be dependent in part upon the manner in which Emory, UGARF
and/or the Regents and/or Dupont Merck conduct the proceedings. Emory, UGARF
and/or the Regents and/or Dupont Merck could, in any of these proceedings they
elect to initiate and maintain, elect not to vigorously pursue or defend or to
settle such proceedings on terms that are not favorable to the Company. An
adverse outcome in any patent litigation or interference proceeding could
subject the Company to significant liabilities to third parties, require
disputed rights to be licensed from third parties or require the Company to
cease using such technology, any of which could have a material adverse effect
on the Company. Moreover, the mere uncertainty resulting from the initiation and
continuation of any technology related litigation or interference proceeding
could have a material adverse effect on the Company pending resolution of the
disputed matters.

     The Company also relies on unpatented trade secrets and know-how to
maintain its competitive position, which it seeks to protect, in part, by
confidentiality agreements with employees, consultants and others. There can be
no assurance that these agreements will not be breached or terminated, that the
Company will have adequate


                                          10
<PAGE>

remedies for any breach, or that the Company's trade secrets will not otherwise
become known or be independently discovered by competitors. The Company relies
on certain technologies to which it does not have exclusive rights or which may
not be patentable or proprietary and thus may be available to competitors. The
Company has filed an application for but has not obtained a trademark
registration with respect to its corporate name and its logo. Another company
has filed an application to obtain a trademark registration for the name
"Triangle Coordinated Care," and the Company is aware that several other
companies use trade names that are similar to the Company's for their
businesses. If the Company is not able to obtain any licenses that may be
necessary for the Company to use its corporate name, it may be required to
change its corporate name. The Company's management personnel were previously
employed by other pharmaceutical companies. In many cases, these individuals are
conducting drug development activities for the Company in areas similar to those
in which they were involved prior to joining the Company. As a result, the
Company, as well as these individuals, could be subject to allegations of
violation of trade secrets and other similar claims.

EXTENSIVE GOVERNMENT REGULATION; NO ASSURANCE OF REGULATORY APPROVAL

     Human pharmaceutical products are subject to rigorous preclinical testing
and clinical trials and other approval procedures mandated by the FDA and
foreign regulatory authorities. Various federal and foreign statutes and
regulations also govern or influence the manufacturing, safety, labeling,
storage, record keeping and marketing of pharmaceutical products. The process of
obtaining these approvals and the subsequent compliance with appropriate United
States and foreign statutes and regulations are time consuming and require the
expenditure of substantial resources. In addition, these requirements and
processes vary widely from country to country. The time required for completing
preclinical testing and clinical trials and obtaining regulatory approvals is
uncertain. The Company may decide to replace a drug candidate in preclinical
testing and/or clinical trials with a modified drug candidate, thus extending
the development period. In addition, the FDA or similar foreign regulatory
authorities may require additional clinical trials, which could result in
increased costs and significant development delays. Delays or rejections may
also be encountered based upon changes in FDA policy during the period of
product development and FDA review. Similar delays or rejections may be
encountered in other countries. The Company's drug candidates may not qualify
for accelerated development and/or approval under FDA regulations and, even if
some of the Company's drug candidates qualify for accelerated development and/or
approval, they may not be approved for marketing sooner than would be
historically expected or at all. There can be no assurance that even after
substantial time and expenditures, any of the Company's drug candidates under
development will receive marketing approval in any country on a timely basis or
at all. If the Company is unable to demonstrate the safety and effectiveness of
its drug candidates to the satisfaction of the FDA or foreign regulatory
authorities, the Company will be unable to commercialize its drug candidates and
would be materially and adversely affected. Further, even if regulatory approval
of a drug candidate is obtained, the approval may entail limitations on the
indicated uses for which the drug candidate may be marketed. A marketed product,
its manufacturer and the manufacturer's facilities are subject to continual
review and periodic inspections, and subsequent discovery of previously unknown
problems with a product, manufacturer or facility may result in restrictions on
such product or manufacturer, including withdrawal of the product from the
market. The failure to comply with applicable regulatory requirements can, among
other things, result in fines, suspension of regulatory approvals, refusal to
approve pending applications, refusal to permit exports from the United States,
product recalls, seizure of products, injunctions, operating restrictions and
criminal prosecutions. Further, FDA policy may change and additional government
regulations may be established that could prevent or delay regulatory approval
of the Company's drug candidates.

     The effect of governmental regulation may be to delay the marketing of new
products for a considerable period of time or to prevent such marketing
altogether, to impose costly requirements on the Company's activities or to
provide a competitive advantage to other companies that compete with the
Company. Adverse clinical results by others could have a negative impact on the
regulatory process and timing with respect to the development and approval of
the Company's drug candidates. A delay in obtaining or failure to obtain
regulatory approvals could have a material adverse effect on the Company. The
extent and character of potentially adverse governmental regulation that may
arise from future legislation or administrative action cannot be predicted.


                                          11
<PAGE>

     The Company is also subject to various federal, state and local laws and
regulations relating to safe working conditions, laboratory and manufacturing
practices, the experimental use of animals and the use and disposal of hazardous
or potentially hazardous substances, including radioactive compounds and
infectious disease agents, used in connection with its development work.

INTENSE COMPETITION; RISK OF TECHNOLOGICAL CHANGE

     The Company is engaged in segments of the pharmaceutical industry that are
highly competitive and rapidly changing. If successfully developed and approved,
the drug candidates that the Company is currently developing will compete with
numerous existing therapies. In addition, a number of companies are pursuing the
development of novel pharmaceuticals that target the same diseases the Company
is targeting. The Company believes that a significant number of drugs are
currently under development and will become available in the future for the
treatment of HIV. The Company anticipates that it will face intense and
increasing competition in the future as new products enter the market and
advanced technologies become available. There can be no assurance that existing
products or new products developed by the Company's competitors will not be more
effective, or more effectively marketed and sold, than any that may be developed
by the Company. Competitive products may render the Company's licensed
technology and products obsolete or noncompetitive prior to the Company's
recovery of development or commercialization expenses incurred with respect to
any such products. The development by others of a cure or new treatment methods
for the indications for which the Company is developing drug candidates could
render the Company's drug candidates noncompetitive, obsolete or uneconomical.
Many of the Company's competitors have significantly greater financial,
technical and human resources than the Company and may be better equipped to
develop, manufacture and market products. In addition, many of these companies
have extensive experience in preclinical testing and clinical trials, obtaining
FDA and other regulatory approvals and manufacturing and marketing
pharmaceutical products. Many of these competitors also have products that have
been approved or are in late stage development and operate large, well funded
research and development programs. Smaller companies may also prove to be
significant competitors, particularly through collaborative arrangements with
large pharmaceutical and biotechnology companies. Furthermore, academic
institutions, governmental agencies and other public and private research
organizations are becoming increasingly aware of the commercial value of their
inventions and are more actively seeking to commercialize the technology they
have developed.

     If the Company's drug candidates are successfully developed and approved,
the Company will face competition based on the safety and effectiveness of its
products, the timing and scope of regulatory approvals, availability of supply,
marketing and sales capability, reimbursement coverage, price and patent
position. There can be no assurance that the Company's competitors will not
develop more effective or more affordable technology or products, or achieve
earlier patent protection, product development or product commercialization than
the Company. Accordingly, the Company's competitors may succeed in
commercializing products more rapidly or effectively than the Company, which
could have a material adverse effect on the Company.

RISKS RELATED TO LICENSE AND OPTION AGREEMENTS

     The agreements pursuant to which the Company has in-licensed or obtained an
option to in-license its drug candidates permit the Company's licensors to
terminate the agreements under certain circumstances, such as the failure by the
Company to achieve certain development milestones or the occurrence of an
uncured material breach by the Company. The termination of any of these
agreements could have a material adverse effect on the Company. Upon termination
of the license agreements with Emory and UGARF, the Company is required to grant
to Emory and UGARF a non-exclusive, royalty free license to all of the Company's
interest in the licensed technology (including any improvements to the
technology developed by the Company). Upon termination of the license agreement
with Dupont Merck, the Company is required to transfer all approved and pending
NDAs relating to DMP-450 to Dupont Merck. In addition, the license and option
agreements with Emory, UGARF, the Regents and Dupont Merck provide that Emory,
UGARF, the Regents and DuPont Merck, respectively, are primarily responsible for
any litigation, interference, opposition or other action seeking to obtain
patent protection for the technology licensed to the Company and, except for
litigation expenses incurred by Dupont Merck, the Company is required to
reimburse them for the costs they incur in performing these activities.  The
Company believes that these costs as well as other costs under the license and
option agreements relating to the Company's drug candidates will be


                                          12
<PAGE>

substantial, and any inability or failure of the Company to pay these costs with
respect to any drug candidate could result in the termination of the license or
option agreement for such drug candidate.

LACK OF MANUFACTURING CAPABILITIES

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

LACK OF SALES AND MARKETING CAPABILITIES

     The Company currently has only one marketing employee and no sales
personnel. The Company will have to develop a sales force or rely on marketing
partners or other arrangements with third parties for the marketing,
distribution and sale of any products it develops. The Company currently intends
to market in the United States most of the drug candidates that it successfully
develops primarily through a direct sales force and outside the United States
through a combination of a direct sales force and arrangements with third
parties. There can be no assurance that the Company will be able to establish
marketing, distribution or sales capabilities or make arrangements with third
parties to perform those activities on terms satisfactory to the Company or that
any internal capabilities or third party arrangements will be cost effective.

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

DEPENDENCE ON THIRD PARTIES FOR DEVELOPMENT, MANUFACTURING AND IN-LICENSING

     The Company intends to engage third party contract research organizations
("CROs") to perform certain functions in connection with the development of the
Company's drug candidates and third parties to perform many aspects of the
manufacture of drug substance. The Company intends to design clinical trials,
but have CROs conduct the clinical trials. The Company will rely on the CROs to
perform many important aspects of clinical trials. As a result, these aspects of
the Company's drug development programs will be outside the direct control of
the Company. In addition, there can be no assurance that the CROs or third
parties will perform all of their obligations under arrangements with the
Company. In the event that the CROs or third parties do not perform clinical
trials or manufacture drug substance in a satisfactory manner or breach their
obligations to the Company, the commercialization of any drug candidate may be
delayed or precluded, which would have a material adverse effect on the Company.
The Company does not intend to engage in drug discovery. The Company's strategy
for obtaining additional drug candidates is to utilize the relationships of its
management team and Scientific Advisory Board to identify compounds for
in-licensing from companies, universities, research institutions and other
organizations. There can be no assurance that the Company will succeed in
in-licensing additional drug candidates on acceptable terms or at all.


                                          13
<PAGE>

NO ASSURANCE OF MARKET ACCEPTANCE

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

RISKS RELATING TO COACTIVE THERAPY

     The Company's success will also depend in large part on the extent to 
which coactive therapy for the treatment of HIV in the United States and 
Europe and for the treatment of HBV in developing areas of the world, 
particularly Asia, achieves market acceptance. Present combination treatment 
regimens for the treatment of HIV are expensive (published reports indicate 
the cost per patient per year can exceed $13,000), and may increase as new 
combinations are developed. These costs have resulted in a limitation of 
reimbursement available from third party payors for the treatment of HIV 
infection, and the Company expects that reimbursement pressures will continue 
in the future. If coactive therapy is accepted as a method to treat HBV, 
treatment regimens are also likely to be expensive. The Company expects that 
even the cost of monotherapy for HBV will be considered expensive in 
developing countries. Any failure of coactive therapy to achieve significant 
market acceptance for the treatment of HIV or potentially HBV could have a 
material adverse effect on the Company.

DEPENDENCE ON KEY EMPLOYEES

     The Company is highly dependent on its senior management and scientific
staff, including Dr. David Barry, the Company's Chairman and Chief Executive
Officer. Except for Dr. Barry, the Company has not entered into employment
agreements with any of its personnel. The loss of the services of any member of
its senior management or scientific staff may significantly delay or prevent the
achievement of product development and other business objectives. Retaining and
attracting qualified personnel, consultants and advisors is critical to the
Company's success. In order to pursue its drug development programs and
marketing plans, the Company will be required to hire additional qualified
scientific and management personnel. Competition for qualified individuals is
intense and the Company faces competition from numerous pharmaceutical and
biotechnology companies, universities and other research institutions. There can
be no assurance that the Company will be able to attract and retain such
individuals on acceptable terms or at all, and the failure to do so would have a
material adverse effect on the Company. In addition, the Company relies on
members of its Scientific Advisory Board to assist the Company in formulating
its drug development strategy. All of the members of the Scientific Advisory
Board are employed by other employers and each such member may have commitments
to, or consulting or advisory contracts, with other entities that may limit his
availability to the Company.

UNCERTAINTY OF HEALTH CARE REFORM MEASURES AND THIRD PARTY REIMBURSEMENT

     The business and financial condition of pharmaceutical companies will
continue to be affected by the efforts of governments and third party payors to
contain or reduce the cost of health care through various means. A number of
legislative and regulatory proposals aimed at changing the health care system
have been proposed in recent years. In addition, an increasing emphasis on
managed care in the United States has and will continue to increase the pressure
on pharmaceutical pricing. While the Company cannot predict whether legislative
or regulatory proposals will be adopted or the effect those proposals or managed
care efforts may have on its business, the announcement and/or adoption of such
proposals or efforts could have a material adverse effect on the Company. In the
United States and elsewhere, sales of prescription pharmaceuticals are dependent
in part on the availability of reimbursement to the consumer from third party
payors, such as government and private insurance plans that mandate
predetermined discounts from list prices. Third party payors are increasingly
challenging the prices charged for medical products and services. If the Company
succeeds in bringing one or more products to the


                                          14
<PAGE>

market, there can be no assurance that these products will be considered cost
effective or that reimbursement to the consumer will be available or will be
sufficient to allow the Company to sell its products on a competitive basis.

LIMITED PRODUCT LIABILITY INSURANCE; INSURANCE RISKS

     The Company's business will expose it to potential product liability risks
that are inherent in the testing, manufacturing and marketing of pharmaceutical
products. There can be no assurance that product liability claims will not be
asserted against the Company. The Company currently has only limited product
liability insurance relating to potential claims arising from its clinical
trials. The Company intends to expand its insurance coverage if and when the
Company begins marketing commercial products. There can be no assurance,
however, that the Company will be able to obtain any additional product
liability insurance on commercially acceptable terms or that the Company will be
able to maintain its existing insurance and/or any additional insurance it may
obtain in the future at a reasonable cost or in sufficient amounts to protect
the Company against potential losses. A successful product liability claim or
series of claims brought against the Company could have a material adverse
effect on the Company.

HAZARDOUS MATERIALS

     The Company's drug development programs involve the controlled use of
hazardous materials, chemicals, viruses and various radioactive compounds.
Although the Company believes that its handling and disposing of such materials
comply with the standards prescribed by state and federal regulations, the risk
of accidental contamination or injury from these materials cannot be completely
eliminated. In the event of such an accident, the Company could be held liable
for any damages or fines that result and any such liability could exceed the
resources of the Company.

CONCENTRATION OF STOCK OWNERSHIP; CONTROL BY MANAGEMENT AND EXISTING
STOCKHOLDERS

     As of December 31, 1997 the Company's directors, executive officers and
their respective affiliates beneficially owned approximately 45% of the
Company's outstanding Common Stock. As a result, these stockholders are able to
exercise significant influence over all matters requiring stockholder approval,
including the election of directors and approval of significant corporate
transactions. Such concentration of ownership may also have the effect of
delaying or preventing a change in control of the Company that may be favored by
other stockholders.

VOLATILITY OF STOCK PRICE

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

     Sales of a substantial number of shares of Common Stock in the public
market could also adversely affect the market price of the Common Stock. In
addition, holders of approximately 11,740,000 shares of Common Stock (including
the Restricted Shares and shares issuable upon the exercise of outstanding
warrants) are entitled to certain rights with respect to registration of such
shares of Common Stock for offer or sale to the public. Any such sales may have
an adverse effect on the Company's ability to raise needed capital through an
offering of its equity or convertible debt securities and may adversely affect
the prevailing market price of the Common Stock.

     Further, the stock market has experienced extreme price and volume
fluctuations that have particularly affected the market prices of equity
securities of many pharmaceutical and biotechnology companies and that often


                                          15
<PAGE>

have been unrelated or disproportionate to the operating performance of such
companies. These market fluctuations, as well as general economic, political and
market conditions such as recessions or international currency fluctuations, may
adversely affect the market price of the Common Stock. In the past, following
periods of volatility in the market price of the securities of companies in the
pharmaceutical and biotechnology industries, securities class action litigation
has often been instituted against those companies. Such litigation, if
instituted against the Company, could result in substantial costs and a
diversion of management attention and resources, which would have a material
adverse effect on the Company. The realization of any of the risks described in
these "Risks and Uncertainties" could have a dramatic and adverse impact on the
market price of the Common Stock.

ANTITAKEOVER EFFECTS OF CHARTER, BYLAWS AND DELAWARE LAW

     The Company's Second Restated Certificate of Incorporation (the
"Certificate") authorizes the Company's Board of Directors (the "Board") to
issue shares of undesignated preferred stock without stockholder approval on
such terms as the Board may determine. The rights of the holders of Common Stock
will be subject to, and may be adversely affected by, the rights of the holders
of any such preferred stock that may be issued in the future. Moreover, the
issuance of preferred stock may make it more difficult for a third party to
acquire, or may discourage a third party from acquiring, a majority of the
voting stock of the Company.  The Company's Restated Bylaws (the "Bylaws")
divide the Board into three classes of directors with each class serving a three
year term. These and other provisions of the Certificate and the Bylaws, as well
as certain provisions of Delaware law, could delay or impede the removal of
incumbent directors and could make more difficult a merger, tender offer or
proxy contest involving the Company, even if such events could be beneficial to
the interest of the stockholders. Such provisions could limit the price that
certain investors might be willing to pay in the future for the Common Stock.

NO DIVIDENDS

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

                                  USE OF PROCEEDS

     The Company will not receive any of the proceeds from the sale of the
Shares being offered hereby.

                                SELLING STOCKHOLDERS

     On June 6, 1997, the Company closed a private placement (the "Private
Placement") of the 2,000,000 Restricted Shares pursuant to a Stock Purchase
Agreement among the Company and the Selling Stockholders (the "Stock Purchase
Agreement").  The consideration received by the Company for the Restricted
Shares was $30,000,000 in cash, or a price of $15.00 per share.  Net proceeds to
the Company from the sale of the Restricted Shares were approximately
$29,400,000.  As part of the Private Placement, the Selling Stockholders
received the right, until June 6, 1999, to nominate one designee to serve on the
Company's Board of Directors, subject to the prior approval of the Company's
Chairman and certain other limitations.

     The Selling Stockholders represented in the Stock Purchase Agreement that
they were acquiring the Restricted Shares for investment and with no present
intention of distributing the Restricted Shares.  In recognition of the fact
that the Selling Stockholders, even though purchasing the Restricted Shares
without a view to distribute, may wish to be legally permitted to sell the
Shares when each deems appropriate, the Company has filed with the Commission a
Registration Statement on Form S-3, of which this Prospectus forms a part, with
respect to, among other things, the resale of the Shares from time to time at
prevailing prices in the over-the-counter market or in privately-negotiated
transactions. The Company has agreed to prepare and file such amendments and
supplements to the Registration Statement as may be necessary to keep the
Registration Statement effective for a period of 19 months, which period may be
extended (by a maximum of five months) to the extent that any Selling
Stockholder is unable to sell its Shares due to a temporary withdrawal of the
Registration Statement by the Company.


                                          16
<PAGE>

     The Selling Stockholders have certain additional registration rights,
pursuant to a Restated Investors Rights Agreement, as amended, among the
Company, each of the Selling Stockholders and certain other stockholders of the
Company, to include the Shares in other registration statements filed by the
Company covering its securities, whether the Company is registering securities
for its own account or for the account of other stockholders, subject to certain
limitations.


     The following table sets forth (i) the name of each Selling Stockholder,
(ii) the number of shares of Common Stock beneficially owned by each Selling
Stockholder as of December 31, 1997, (iii) the number of Shares which may be
offered pursuant to this Prospectus, and (iv) the number of Shares owned by each
Selling Stockholder upon completion of this offering. This information is based
upon information provided to the Company by the Selling Stockholders or from the
Company's records. The numbers set forth in the column "Number of Shares Being
Offered" below constitute all of the Shares that each Selling Stockholder may
distribute in the offering; however, there are currently no agreements,
arrangements or understandings with respect to the sale of any of the Shares and
the table below assumes the sale of all Shares held by each Selling Stockholder.



<TABLE>
<CAPTION>
                                                  SHARES BENEFICIALLY      NUMBER OF      SHARES BENEFICIALLY
                                                         OWNED               SHARES              OWNED
                                                   PRIOR TO OFFERING          BEING        AFTER OFFERING(3)
                                                  ----------------------                  -------------------
SELLING STOCKHOLDERS                              NUMBER      PERCENT (1)  OFFERED (2)     NUMBER   PERCENT
- --------------------                              --------    -----------  -----------      ------   -------
<S>                                               <C>         <C>          <C>              <C>      <C>
Quantum Industrial Partners LDC(4)                 1,000,000      5.0%      1,000,000         0        0%
Quantum Partners LDC(4)                              964,500      4.8%        964,500         0        0%
Duquesne Fund, L.P.(4)                               800,000      4.0%        800,000         0        0%
Quasar Partners(4)                                    25,000         *         25,000         0        0%
__________________________________
</TABLE>


(1) Percentage ownership is based on 19,995,338 shares of Common Stock of the
Company outstanding on December 31, 1997, calculated pursuant to Rule
13d-3(d)(1) under the Exchange Act.

(2)  This Registration Statement shall also cover any additional shares of
Common Stock which become issuable in connection with the Shares registered for
sale hereby as a result of any stock dividend, stock split, recapitalization or
other similar transaction effected without the receipt of consideration which
results in an increase in the number of the Company's outstanding shares of
Common Stock.

(3)  Assumes the sale of all shares offered hereby and no other purchases or
sales of the Company's Common Stock.

(4)  George Soros and Soros Fund Management LLC ("SFM LLC"), through certain
ownership, advisory and contractual arrangements, may be deemed to be the
beneficial owners of 1,989,500 Shares (approximately 10% of the outstanding
shares of Common Stock), comprising (i) 1,000,000 Shares held for the account of
Quantum Industrial Partners LDC ("QIP"), (ii) 964,500 Shares held for the
account of Quantum Partners LDC ("Quantum Partners") and (iii) 25,000 Shares
held for the account of Quasar Partners.  Stanley F. Druckenmiller, who serves
on the management committee of SFM LLC with Mr. Soros, through certain
ownership, advisory and contractual arrangements, may be deemed to be the
beneficial owner of 2,789,500 Shares (approximately 14% of the outstanding
shares of Common Stock), comprising (i) 1,000,000 Shares held for the account of
QIP, (ii) 964,500 Shares held for the account of Quantum Partners, (iii) 25,000
Shares held for the account of Quasar Partners, and (iv) 800,000 Shares held for
the account of Duquesne Fund, L.P.


                                PLAN OF DISTRIBUTION

     The Company has been advised that the Selling Stockholders or pledgees,
donees, transferees of or other successors in interest to the Selling
Stockholders may sell Shares from time to time in transactions on the Nasdaq
National Market, in privately negotiated transactions or a combination of such
methods of sale, at fixed prices which may be changed, at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices or at negotiated prices. The Selling Stockholders may effect such
transactions by selling the Shares to or through broker-dealers, and such
broker-dealers may receive compensation in the form of discounts, concessions or
commissions from the Selling Stockholders or the purchasers of the Shares for
whom such broker-dealers may act


                                          17
<PAGE>

as agent or to whom they sell as principal, or both (which compensation to a
particular broker-dealer might be in excess of customary commissions).

     At any time a particular offer of Shares is made, to the extent required, a
supplemental Prospectus will be distributed which will set forth the number of
Shares offered and the terms of the offering including the names or names of any
underwriters, dealers or agents, the purchase price paid by any underwriter for
the Shares purchased from the Selling Stockholders, any discounts, commission
and other items constituting compensation from the Selling Stockholders and any
discounts, concessions or commissions allowed or reallowed or paid to dealers.

     The Selling Stockholders and any broker-dealers who act in connection with
the sale of Shares hereunder may be deemed to be "underwriters" as that term is
defined in the Securities Act, and any commissions received by them and profit
on any resale of the Shares as principal might be deemed to be underwriting
discounts and commissions under the Securities Act.

     Any or all of the sales or other transactions involving the Shares
described above, whether effected by the Selling Stockholders, any broker-dealer
or others, may be made pursuant to this Prospectus. In addition, any Shares that
qualify for sale pursuant to Rule 144 or Rule 904 under the Act may be sold
under Rule 144 or Rule 904 rather than pursuant to this Prospectus.

     Pursuant to a Restated Investors Rights Agreement, as amended, among the
Company, each of the Selling Stockholders and certain other stockholders of the
Company, the Company and an underwriter of the Company's securities has the
right to restrict the sale, transfer or other disposition of the Shares by the
Selling Stockholders for a period of ninety (90) days following the effective
date of a registration statement filed under the Securities Act to register the
sale by the Company of its securities.

     In order to comply with the securities laws of certain states, if
applicable, the Shares may be sold in such jurisdictions only through registered
or licensed brokers or dealers. In addition, in certain states the Shares may
not be sold unless they have been registered or qualified for sale or an
exemption from registration or qualification requirements is available and is
complied with.

     Under applicable rules and regulations under the Exchange Act, any person
engaged in the distribution of the Shares may not simultaneously engage in
market making activities with respect to the Company's Common Stock for a period
of two business days prior to the commencement of such distribution. In addition
and without limiting the foregoing, the Selling Stockholders will be subject to
applicable provisions of the Exchange Act and the rules and regulations
thereunder, including without limitation, Regulation M, which provisions may
limit the timing of purchases and sales of Shares by the Selling Stockholders.


     All costs and expenses associated with registering the Shares being offered
hereunder with the Commission will be paid by the Company. Such costs and
expenses are estimated to be approximately $40,000.

     The Company and the Selling Stockholders may agree to indemnify certain
persons including broker-dealers or others, against certain liabilities in
connection with any offering of the Shares including liabilities under the
Securities Act.

                                   LEGAL MATTERS

     The validity of the Shares offered hereby will be passed upon for the
Company by Brobeck, Phleger & Harrison LLP, San Diego, California.  Members of
such firm own a total of 15,333 shares of the Company's Common Stock.

                                      EXPERTS

     The financial statements incorporated herein by reference to the Annual
Report on Form 10-K of the Company for the year ended December 31, 1996 have
been so incorporated in reliance on the report of Price


                                          18
<PAGE>

Waterhouse LLP, independent accountants, given on the authority of said firm as
experts in auditing and accounting.

     The financial statements incorporated herein by reference to the audited
historical financial statements of Avid Corporation and subsidiaries included on
pages 5 through 20 of the Company's Amendment No. 1 to Current Report on Form
8-K/A filed on November 12, 1997 have been so incorporated in reliance on the
report of KPMG Peat Marwick LLP, independent auditors, given upon their
authority as experts in auditing and accounting.  The report of KPMG Peat
Marwick LLP covering the December 31, 1996 financial statements of Avid
Corporation and subsidiaries contains an explanatory paragraph that states that
Avid Corporation has suffered recurring losses from operations and will require
additional capital to fund future operations, which raises substantial doubt
about such entity's ability to continue as a going concern.  The consolidated
financial statements of Avid Corporation and subsidiaries do not include any
adjustments which might result from the outcome of that uncertainty.


                                          19
<PAGE>


                                      PART II
                       INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth all expenses, other than underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of the Common Stock being registered. All the amounts shown are estimates,
except for the registration fee.


          Registration fee . . . . . . . . . . . . . $13,940
          Printing and engraving expenses. . . . . .   5,000
          Legal fees and expenses. . . . . . . . . .  10,000
          Accounting fees and expenses . . . . . . .   5,000
          Transfer Agent and Registrar fees. . . . .   2,000
          Miscellaneous expenses . . . . . . . . . .   4,060
                                                     -------

              TOTAL. . . . . . . . . . . . . . . . . $40,000
                                                     -------
                                                     -------

ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

     Section 145 of the Delaware General Corporation Law permits indemnification
of officers and directors of the Company under certain conditions and subject to
certain limitations. Section 145 of the Delaware General Corporation Law also
provides that a corporation has the power to purchase and maintain insurance on
behalf of its officers and directors against any liability asserted against such
person and incurred by him or her in such capacity, or arising out of his or her
status as such, whether or not the corporation would have the power to indemnify
him or her against such liability under the provisions of Section 145 of the
Delaware General Corporation Law.

     Article VII, Section (i) of the Restated Bylaws of the Company provides
that the Company shall indemnify its directors and executive officers to the
fullest extent not prohibited by the Delaware General Corporation Law. The
rights to indemnity thereunder continue as to a person who has ceased to be a
director, officer, employee or agent and inure to the benefit of the heirs,
executors and administrators of the person. In addition, expenses incurred by a
director or officer in defending any civil, criminal, administrative or
investigative action, suit or proceeding by reason of the fact that he or she is
or was a director or officer of the Company (or was serving at the Company's
request as a director or officer of another corporation) shall be paid by the
Company in advance of the final disposition of such action, suit or proceeding
upon receipt of an undertaking by or on behalf of such director or officer to
repay such amount if it shall ultimately be determined that he or she is not
entitled to be indemnified by the Company as authorized by the relevant section
of the Delaware General Corporation Law.

     As permitted by Section 102(b)(7) of the Delaware General Corporation Law,
Article 5, Section (a) of the Company's Second Restated Certificate of
Incorporation provides that a director of the Company shall not be personally
liable for monetary damages for breach of fiduciary duty as a director, except
for liability (i) for any breach of the director's duty of loyalty to the
Company or its stockholders, (ii) for acts or omissions not in good faith or
acts or omissions that involve intentional misconduct or a knowing violation of
law, (iii) under Section 174 of the Delaware General Corporation Law or (iv) for
any transaction from which the director derived any improper personal benefit.

     The Company has entered into indemnification agreements with its directors
and executive officers. Generally, the indemnification agreements attempt to
provide the maximum protection permitted by Delaware law as it may be amended
from time to time. Under such additional indemnification provisions, however, an
individual will not receive indemnification for judgments, settlements or
expenses if he or she is found liable to the Company (except to the extent the
court determines he or she is fairly and reasonably entitled to indemnity for
expenses), for


                                         II-1

<PAGE>

settlements not approved by the Company or for settlements and expenses if the
settlement is not approved by the court. The indemnification agreements provide
for the Company to advance to the individual any and all reasonable expenses
(including legal fees and expenses) incurred in investigating or defending any
such action, suit or proceeding. In order to receive an advance of expenses, the
individual must submit to the Company copies of invoices presented to him or her
for such expenses. Also, the individual must repay such advances upon a final
judicial decision that he or she is not entitled to indemnification.

     The Registrant has an insurance policy covering the directors and officers
of the Registrant with respect to certain liabilities, including liabilities
arising under the Securities Act or otherwise.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

    (a) EXHIBITS.

     EXHIBIT NO.    DESCRIPTION
     -----------    -----------

      5.1           Opinion of Brobeck, Phleger & Harrison LLP


      10.1          Common Stock Purchase Agreement among the Company and
                    certain investors dated June 6, 1997

    **10.2          Restated Investors Rights Agreement among the Company and
                    certain stockholders of the Company dated June 11, 1996
                    (Exhibit 10.29)

     *10.3          First Amendment to Restated Investors' Rights Agreement
                    among the Company and certain stockholders of the Company
                    dated June 6, 1997 (Exhibit 10.2)

      23.1          Consent of Price Waterhouse LLP, Independent Accountants

      23.2          Consent of KPMG Peat Marwick LLP

      23.3          Consent of Brobeck, Phleger & Harrison LLP. Reference is
                    made to Exhibit 5.1

      24.1          Power of Attorney. Reference is made to page II-4.
________________
*    Incorporated by reference to the same numbered exhibit (unless otherwise
indicated) to the Company's Quarterly Report on Form 10-Q for the quarterly
period ended June 30, 1997.
**   Incorporated by reference to the same numbered exhibit (unless otherwise
indicated) to the Company's Registration Statement on Form S-1 (No. 333-11793)
filed on September 11, 1996, as amended.


ITEM 17. UNDERTAKINGS.

     The undersigned Registrant hereby undertakes:

     (1)  To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement 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;

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


                                         II-2

<PAGE>

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

     (4)  If the registrant is a foreign private issuer, to file a
post-effective amendment to the registration statement to include any financial
statements required by Rule 3-19 of Regulation S-X at the state of any delayed
offering or throughout a continuous offering.  Financial statements and
information otherwise required by Section 10(a)(3) of the Act need not be
furnished, provided, that the registrant includes in the prospectus, by means of
a post- effective amendment, financial statements required pursuant to this
paragraph (a)(4) and other information necessary to ensure that all other
information in the prospectus is at least as current as the date of those
financial statements. Notwithstanding the foregoing, with respect to
registration statements on Form F-3, a post-effective amendment need not be
filed to include financial statements and information required by Section
10(a)(3) of the Act or Rule 3-19 of this chapter if such financial statements
and information are contained in periodic reports filed with or furnished to the
Commission by the registrant pursuant to section 13 or section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in the Form
F-3.

     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Act, each filing of the Registrant's annual
report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act
of 1934 (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Securities Exchange Act of 1934) 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 to deliver or cause to be
delivered with the Prospectus, to each person to whom the Prospectus is sent or
given, the latest annual report to security holders that is incorporated by
reference in the Prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X are not set forth in the Prospectus, to deliver, or
cause to be delivered to each person to whom the Prospectus is sent or given,
the latest quarterly report that is specifically incorporated by reference in
the Prospectus to provide such interim financial information.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Company pursuant to the foregoing provisions, Delaware Corporation law, the
Underwriting Agreement 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 Act and is, therefor, 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 hereunder,
the Registrant will, unless in the opinion of its counsel the question has been
settled by controlling precedent, submit to a court of appropriate jurisdiction
the question of whether such indemnification by it is against public policy as
expressed in the Act and will be governed by the final adjudication of such
issue.


                                         II-3

<PAGE>

                                     SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Durham, State of North Carolina, on the 23rd day of
January 1998.

                                   TRIANGLE PHARMACEUTICALS, INC.


                                   By:  /s/ DAVID W. BARRY
                                        ----------------------------------------
                                            David W. Barry
                                            Chairman and Chief Executive Officer

                                 POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints, jointly and severally, David W.
Barry and James A. Klein, Jr., and each of them acting individually, as his
attorney-in-fact, each with full power of substitution and resubstitution, for
him or her in any and all capacities, to sign any and all amendments to this
Registration Statement (including post-effective amendments), and to file the
same, with exhibits thereto and other documents in connection therewith, with
the Securities and Exchange Commission, granting unto said attorneys-in-fact
full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection therewith as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact, or their substitute or substitutes,
may lawfully do or cause to be done by virtue hereof.

     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:

<TABLE>
<CAPTION>
<S>                                <C>                                          <C>
                                   Chairman of the Board and Chief
/s/ DAVID W. BARRY                 Executive Officer (Principal Executive       January 23, 1998
- --------------------------         Officer)
    (David W. Barry)

                                   Chief Financial Officer and
/s/ JAMES A. KLEIN, JR.            Treasurer (Principal Financial               January 23, 1998
- --------------------------         and Accounting Officer)
    (James A. Klein, Jr.)

/s/ M. NIXON ELLIS                 Director, President and                      January 23, 1998
- --------------------------
    (M. Nixon Ellis)               Chief Operating Officer

/s/ ANTHONY B. EVNIN               Director                                     January 23, 1998
- --------------------------
    (Anthony B. Evnin)

/s/ STANDISH M. FLEMING            Director                                     January 23, 1998
- --------------------------
    (Standish M. Fleming)

/s/ KARL Y. HOSTETLER              Director                                     January 23, 1998
- ---------------------------
    (Karl Y. Hostetler)

/s/ GEORGE MCFADDEN                Director                                     January 23, 1998
- ---------------------------
    (George McFadden)

/s/ PETER MCPARTLAND               Director                                     January 23, 1998
- ---------------------------
    (Peter McPartland)
</TABLE>


                             II-4

<PAGE>

                                   EXHIBIT INDEX


          EXHIBIT NO.    DESCRIPTION
          -----------    -----------

           5.1           Opinion of Brobeck, Phleger & Harrison LLP


          *10.1          Common Stock Purchase Agreement among the Company and
                         certain investors dated June 6, 1997

         **10.2          Restated Investors Rights Agreement among the Company
                         and certain stockholders of the Company dated June 11,
                         1996 (Exhibit 10.29)

          *10.3          First Amendment to Restated Investors' Rights Agreement
                         among the Company and certain stockholders of the
                         Company dated June 6, 1997 (Exhibit 10.2)

           23.1          Consent of Price Waterhouse LLP, Independent
                         Accountants

           23.2          Consent of KPMG Peat Marwick LLP

           23.3          Consent of Brobeck, Phleger & Harrison LLP. Reference
                         is made to Exhibit 5.1

           24.1          Power of Attorney. Reference is made to page II-4.
________________
*    Incorporated by reference to the same numbered exhibit (unless otherwise
indicated) to the Company's Quarterly Report on Form 10-Q for the quarterly
period ended June 30, 1997.
**   Incorporated by reference to the same numbered exhibit (unless otherwise
indicated) to the Company's Registration Statement on Form S-1 (No. 333-11793)
filed on September 11, 1996, as amended.


                                 II-5

<PAGE>

                                                                   Exhibit  5.1
                     [BROBECK, PHLEGER & HARRISON LLP LETTERHEAD]

                                   January 23, 1998





Triangle Pharmaceuticals, Inc.
4 University Place
4611 University Drive
Durham, North Carolina 27707

     Re:  2,789,500 Shares of Common Stock of Triangle Pharmaceuticals, Inc.
          ------------------------------------------------------------------

Ladies and Gentlemen:

          We have acted as counsel to Triangle Pharmaceuticals, Inc., a Delaware
corporation (the "Company"), in connection with the registration of 2,789,500
shares of Common Stock (the "Common Stock"), as described in the Company's
Registration Statement on Form S-3 (the "Registration Statement"), to be filed
promptly with the Securities and Exchange Commission under the Securities Act of
1933, as amended.

     We are familiar with the corporate proceedings taken by the Company in
connection with the issuance and sale of the Common Stock.  It is our opinion
that the Common Stock is validly issued, fully paid and nonassessable.

     We consent to the filing of this opinion as an exhibit to the Registration
Statement and to the reference to this firm under the caption "Legal Matters" in
the Prospectus which is part of the Registration Statement.  Subject to the
foregoing sentence, this opinion is given as of the date hereof solely for your
benefit and may not be relied upon, circulated, quoted or otherwise referred to
for any purpose without our prior written consent.

                                        Very truly yours,

                                        /s/ BROBECK, PHLEGER & HARRISON LLP

                                        BROBECK, PHLEGER & HARRISON LLP




<PAGE>
                                                                    Exhibit 23.1

                          CONSENT OF INDEPENDENT ACCOUNTANTS


The Board of Directors
Triangle Pharmaceuticals, Inc.:

     We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
February 27, 1997 appearing on page 44 of the Company's Annual Report on Form
10-K for the year ended December 31, 1996.  We also consent to the reference to
us under the heading "Experts."


/s/ PRICE WATERHOUSE LLP

PRICE WATERHOUSE LLP
Raleigh, North Carolina
January 19, 1998


<PAGE>

                                                                    Exhibit 23.2

                           CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Triangle Pharmaceuticals, Inc.:

We consent to the incorporation by reference in the Prospectus constituting 
part of the Registration Statement on Form S-3 of Triangle Pharmaceuticals, 
Inc. of our report dated June 27, 1997, with respect to the consolidated 
balance sheets of Avid Corporation and subsidiaries (the Company) as of 
December 31, 1996 and 1995, and the related consolidated statements of 
operations, shareholders' equity, and cash flows for the years then ended, 
which report appears on page 5 of the Current Report on Form 8-K/A of 
Triangle Pharmaceuticals, Inc. filed November 12, 1997.  We also consent to 
the reference to us under the heading "Experts."

Our report dated June 27, 1997, contains an explanatory paragraph that states 
that the Company has suffered recurring losses from operations and will 
require additional capital to fund future operations, which raises 
substantial doubt about the entity's ability to continue as a going concern.  
The consolidated financial statements of the Company do not include any 
adjustments which might result from the outcome of that uncertainty.

/s/ KPMG Peat Marwick LLP

Philadelphia, Pennsylvania
January 22, 1998



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