TITAN PHARMACEUTICALS INC
S-3, 1997-12-16
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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    As filed with the Securities and Exchange Commission on December 16, 1997
                                                    Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

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

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

                           TITAN PHARMACEUTICALS, INC.
        (Exact name of Small Business Issuer as specified in its charter)

        Delaware                      2836                    94-3171940
(State or other jurisdic-      (Primary standard           (I.R.S. employer
 tion of incorporation)    industrial classification     identification number)
                                   code number)
                                   
                             400 Oyster Point Blvd.
                      South San Francisco, California 94080
                                 (650) 244-4990
          (Address and telephone number of principal executive offices
                        and principal place of business)

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

                 Louis R. Bucalo, M.D., Chief Executive Officer
                           Titan Pharmaceuticals, Inc.
                             400 Oyster Point Blvd.
                      South San Francisco, California 94080
                                 (650) 244-4990
            (Name, address and telephone number of agent for service)

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

                                   Copies to:

                               Fran Stoller, Esq.
                      Bachner, Tally, Polevoy & Misher LLP
                               380 Madison Avenue
                            New York, New York 10017
                                 (212) 687-7000

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

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 pursuant to dividend or interest reinvestment plans, please
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 registration statement for the same
offering. [_]

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

<PAGE>

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
====================================================================================================

Title of Each  Class of          Amount to          Proposed      Proposed         Amount of
Securities to be Registered      be Registered      Maximum       Maximum          Registration
                                                    Aggregate     Aggregate        Fee
                                                    Price per     Offering Price
                                                    Share(1)
- ---------------------------------------------------------------------------------------------------
<S>                              <C>                <C>           <C>              <C>    
 Common Stock, $.001 par value   594,595 shares     $5.19         $3,085,948.05    $910.00
===================================================================================================
</TABLE>

(1)  Estimated solely for purposes of calculating the registration fee pursuant
     to Rule 457(c) under the Securities Act of 1933, as amended, on the basis
     of the market price of the Common Stock on the Nasdaq SmallCap Market on
     December 15, 1997.

     The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.


                                      (ii)

<PAGE>

Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.

                 SUBJECT TO COMPLETION - DATED DECEMBER 16, 1997
PROSPECTUS
                           TITAN PHARMACEUTICALS, INC.

     This Prospectus relates to the offer and resale by Hoechst Marion Roussel,
Inc. (the "Selling Stockholder") of 594,595 shares (the " Shares") of common
stock, $.001 par value (the "Common Stock") of Titan Pharmaceuticals, Inc. (the
"Company").

     The Company is obligated under certain circumstances, upon the request of
the Selling Stockholder, to pay the Selling Stockholder, in cash, the difference
between (i) $5,500,000 and (ii) the net proceeds received by the Selling
Stockholder from the sale of Shares. See "Selling Stockholder."

     The Selling Stockholder is obligated to sell the Shares through a
broker-dealer designated by the Company; provided that if the Company has not
designated a broker-dealer by the date of this Prospectus, the Selling
Stockholder may select a broker-dealer for such sales. The Company has not
determined which, if any, broker-dealer it will designate. Subject to the
foregoing, the Shares may be offered by the Selling Stockholder from time to
time in transactions on the Nasdaq SmallCap Market, in privately negotiated
transactions, through the writing of options on the Shares or a combination of
such methods of sale, at fixed prices that 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 Stockholder 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 Stockholder 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 Stockholder" and "Plan of Distribution."

     The Company will not receive any of the proceeds from the sale of the
Shares by the Selling Stockholder. The Company has agreed to bear certain
expenses (other than fees and expenses, if any, of counsel or other advisors to
the Selling Stockholder) in connection with the registration and sale of the
Shares. The Company has agreed to indemnify the Selling Stockholder against
certain liabilities, including certain liabilities under the Securities Act of
1933, as amended (the "Act").

     The Company's Units, Common Stock and Class A Warrants are traded on The
Nasdaq SmallCap Market ("Nasdaq") under the symbols TTNPU, TTNP, and TTNPW,
respectively. On December 15, 1997, the closing bid prices of the Units, Common
Stock and Warrants were $6.375, $5.1875 and $1.3125, respectively.

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

     THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK. SEE "RISK
                          FACTORS" BEGINNING ON PAGE 5.

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

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 _________ , 199_

<PAGE>

                              AVAILABLE INFORMATION

     The Company has filed with the Securities and Exchange Commission (the
"Commission"), Washington, D.C. a Registration Statement on Form S-3 under the
Securities Act of 1993, as amended (the "Act") covering the securities offered
by this Prospectus. This Prospectus does not contain all of the information set
forth in the Registration Statement and the exhibits thereto. Statements
contained in this Prospectus as to the contents of any contract or other
document referred to are not necessarily complete and in each instance such
statement is qualified by reference to each such contract or document. The
Company is subject to the informational requirements of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and in accordance therewith files
reports and other information with the Commission. Copies of such material can
be obtained from the Public Reference Section of the Commission at 450 Fifth
Street, N.W., Washington, D.C. 20549 at prescribed rates. The Company is an
electronic filer, and the Commission maintains a web site that contains reports,
proxy and information statements and other information regarding the Company at
www.sec.gov./edgar.html.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents filed with the Commission (File No. 0-27436)
pursuant to the Exchange Act are incorporated herein by reference:

1.   The Company's Annual Report on Form 10-KSB for the fiscal year ended
     December 31, 1996, including any documents or portions thereof incorporated
     by reference therein;

2.   The Company's Current Report on Form 8-K filed with the Commission on
     January 15, 1997;

3.   The Company's Quarterly Report on Form 10-QSB for the period ended March
     31, 1997;

4.   The Company's Current Report on Form 8-K filed with the Commission on May
     30, 1997;

5.   The Company's Current Report on Form 8-K filed with the Commission on June
     10, 1997;

6.   The Company's definitive Proxy Statement dated June 25, 1997;

7.   The Company's Quarterly Report on Form 10-QSB for the period ended June 30,
     1997;

8.   The Company's Current Report on Form 8-K filed with the Commission on July
     18, 1997;

9.   The Company's Quarterly Report on Form 10-QSB for the period ended
     September 30, 1997;


                                      - 2 -

<PAGE>

10.  The Company's Current Report on Form 8-K filed with the Commission on
     November 21, 1997;

11.  The Company's Registration Statement on Form 8-A declared effective on
     January 18, 1996, registering the Common Stock and Class A Warrants under
     the Exchange Act; and

12.  All other documents filed by the Company pursuant to Sections 13(a), 13(c),
     14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus
     and prior to the termination of this offering.

     Any statement contained in any document incorporated or deemed to be
incorporated by reference 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 subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as 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 any such person, a copy of any or all of the documents
incorporated herein by reference (other than exhibits to such documents which
are not specifically incorporated by reference into such documents). Requests
for such documents should be directed to the Company, 400 Oyster Point
Boulevard, South San Francisco, California 94080, Attention: Chief Financial
Officer, telephone (415) 244-4990.


                                      - 3 -

<PAGE>

                               PROSPECTUS SUMMARY

     This Prospectus contains forward-looking statements that involve risks and
uncertainties. The Company's actual results may differ significantly from the
results discussed in the forward-looking statements due to, among other factors,
the results of ongoing research and development activities, pre-clinical and
clinical testing, financing and strategic agreements and relationships; and
those factors discussed in the Section entitled "Risk Factors," as well as those
factors described elsewhere herein and in any documents actually or deemed to be
incorporated herein.

     Titan Pharmaceuticals, Inc. ("Titan") is engaged in the development of
therapeutic products for the treatment of cancer, disorders of the central
nervous system and other serious and life-threatening diseases. Titan's products
utilize core technologies, including molecular therapy, cell therapy and gene
therapy. Titan's strategy is to develop the products in its current portfolio,
while actively seeking to acquire additional complementary therapeutic
technologies and products.

     In January 1997, Titan obtained an exclusive worldwide license from Hoechst
Marion Roussel, Inc. ("Hoechst") to Iloperidone, an "atypical" antipsychotic
agent in development for the treatment of schizophrenia and related disorders.
Iloperidone has been evaluated in Phase I and II human clinical trials and is
set to enter Phase III clinical trials. In November 1997, Titan entered into an
agreement (the" Sublicense Agreement") with Novartis Pharma AG ("Novartis")
pursuant to which Novartis was granted a sublicense for the worldwide (with the
exception of Japan) development, manufacturing and marketing of Iloperidone.
Pursuant to the Sublicense Agreement, Novartis paid Titan $18 million in license
fees and reimbursement of research and development expenses and made a $5
million equity investment in Titan, and is required to make additional milestone
and royalty payments to Titan.

     Titan's product pipeline includes three potential cancer vaccines utilizing
anti-idiotypic antibody technology which have demonstrated the ability to
generate an immune response against antigens associated with most
adenocarcinomas (such as colon, gastrointestinal and non-small cell lung
cancer), breast cancer, small cell lung cancer, ovarian cancer and melanoma: Cea
Vac, TriGem and TriAB have all completed Phase I clinical trials in various
cancer types and Phase II/III studies are planned for 1998.

     Two additional cancer products in Titan's portfolio are MDRx1, a gene
therapy product which has completed Phase I testing in ovarian and breast cancer
patients at M.D. Anderson Cancer Center in Houston, and Pivanex Injection, a
product which has demonstrated encouraging results in an ongoing Phase I study.
Titan's portfolio also includes additional potential cancer therapeutics, as
well as two platform technologies and two potential products relating to the
treatment of central nervous system ("CNS") diseases, which are all in the
preclinical development stage.

     A portion of Titan's operations are currently conducted through three
entities (the "Operating Companies"). Ingenex, Inc. ("Ingenex"), a company
engaged in the development of proprietary gene-based therapies; ProNeura, Inc.,
("ProNeura"), a company engaged in research and development activities relating
to a polymeric implantable drug delivery technology; and Theracell, Inc.
("Theracell"), a company engaged in the development of cell-based therapeutics
intended for the restorative treatment of neurological diseases and central
nervous system disorders. In November 1997, Ansan Pharmaceuticals, Inc.
("Ansan"), a former Operating Company, completed a merger which resulted in
Titan divesting itself of its equity interest in Ansan in exchange for the
rights to Pivanex Injection and the repayment of outstanding indebtedness to
Titan.

     References to the Company include the Operating Companies unless the
context requires otherwise. Titan was incorporated in Delaware in February 1992.
Titan's executive offices are located at 400 Oyster Point Blvd., Suite 505,
South San Francisco, California 94080, and its telephone number is (415)
244-4990.


                                      -4-
<PAGE>

                                  RISK FACTORS

     The Shares offered hereby are speculative in nature and an investment in
the Shares 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 in evaluating whether to purchase
the Shares offered hereby.

     History of Operating Losses; Need for Additional Financing. The Company has
experienced substantial operating losses since its inception in July 1991. As of
September 30, 1997, the Company's accumulated deficit was approximately $56.9
million. Such losses have been principally the result of the various costs
associated with research and development activities and the Company's provision
of financial, administrative, regulatory and management services to the
Operating Companies. At December 15, the Company had working capital of
approximately $25.5 million and believes that available funds will enable it to
fund its operations for at least 18-24 months. The Company will be required to
seek substantial additional financing to commercialize any products that it may
successfully develop. The Company has no bank lines of credit and there can be
no assurance that the Company will be able to obtain any needed additional
financing on commercially reasonable terms.

     Early Stage of Development of Proposed Products. The Company's proposed
products are at various stages of development and will require significant
further research, development, testing and regulatory clearances prior to
commercialization. There can be no assurance that any proposed products will be
successfully developed, prove to be safe and efficacious, receive requisite
regulatory approvals, demonstrate substantial therapeutic benefits in the
treatment of any disease or condition, be capable of being produced in
commercial quantities at reasonable costs or be successfully marketed.
Accordingly, the Company must be evaluated in light of the expenses, delays,
uncertainties and complications typically encountered by newly established
biopharmaceutical businesses, many of which may be beyond the Company's control.
These include, but are not limited to, unanticipated problems relating to
product development, testing, regulatory compliance, manufacturing, marketing
and competition, and additional costs and expenses that may exceed current
estimates. There can be no assurance that the Company will successfully develop
and commercialize any products or ever achieve profitable operations.

     Government Regulation. The research, preclinical development, clinical
trials, product manufacturing and marketing to be conducted by or on behalf of
the Company are subject to regulation by the FDA and similar health authorities
in foreign countries. FDA approval of products, as well as the manufacturing
processes and facilities, if any, used to produce such products, will be
required before such products may be commercialized in the United States. The
process of obtaining approvals from the FDA is costly, time consuming and often
subject to unanticipated delays. There can be no assurance that approvals of any
of the proposed products, processes or facilities will be granted on a timely
basis, if at all. Even if regulatory approval is granted, such approval may
include significant limitations on indicated uses for which any such products
could be marketed. Further, even if such regulatory approvals are obtained, a
marketed drug and its manufacturer are subject to continued review, and later
discovery of previously unknown problems may result in restrictions on such
product or manufacturer, including withdrawal of the product from the market.
New government regulations in the United States or foreign countries also may be
established that could delay or prevent regulatory approval of


                                      -5-
<PAGE>

products under development. Further, because gene therapy is a relatively new
technology and has not been extensively tested in humans, the regulatory
requirements governing gene therapy products are uncertain and may be subject to
substantial further review by various regulatory authorities in the United
States and abroad. This uncertainty may result in extensive delays in initiating
clinical trials and in the regulatory approval process for Ingenex. Regulatory
requirements ultimately imposed could have a material adverse effect upon the
business of Ingenex and, ultimately, the Company. Failure by the Company to
obtain regulatory approval of its proposed products, processes or facilities
could have a material adverse effect on its business, financial condition and
results of operations. The proposed products under development may also be
subject to certain other federal, state and local government regulations,
including, but not limited to, the Federal Food, Drug and Cosmetic Act, the
Environmental Protection Act, the Occupational Safety and Health Act, and state,
local and foreign counterparts to certain of such acts.

     Reliance on Patents and Other Proprietary Rights. The Company's success
will depend, in part, on its ability, and the ability of the Operating Companies
and their licensor(s), to obtain protection for their products and technologies
under United States and foreign patent laws, to preserve their trade secrets,
and to operate without infringing the proprietary rights of third parties. The
Company has obtained rights to certain patents and patent applications and may,
in the future, seek rights from third parties to additional patents and patent
applications. There can be no assurance that patent applications relating to
potential products or technologies, including those licensed from others, or
that the Company may license in the future, will result in patents being issued,
that any issued patents will afford adequate protection or not be challenged,
invalidated, infringed, or circumvented, or that any rights granted thereunder
will afford competitive advantages to the Company. Furthermore, there can be no
assurance that others have not independently developed, or will not
independently develop, similar products and/or technologies, duplicate any of
the Company's products or technologies, or, if patents are issued to, or
licensed by, the Company, design around such patents.

     There can be no assurance that the validity of any of the patents licensed
to the Company would be upheld if challenged by others in litigation or that the
Company's activities would not infringe patents owned by others. The Company
could incur substantial costs in defending itself and/or the Operating Companies
in suits brought against them or any of their licensors, or in suits in which
the Company may assert, against others, patents in which the Company has rights.
Should the Company's products or technologies be found to infringe patents
issued to third parties, the manufacture, use, and sale of such products could
be enjoined and the Company could be required to pay substantial damages. In
addition, the Company may be required to obtain licenses to patents or other
proprietary rights of third parties, in connection with the development and use
of their products and technologies. No assurance can be given that any licenses
required under any such patents or proprietary rights would be made available on
acceptable terms, if at all.

     Titan also relies on trade secrets and proprietary know-how, which it seeks
to protect, in part, by confidentiality agreements with employees, consultants,
advisors, and others. There can be no assurance that such employees,
consultants, advisors, or others, will maintain the confidentiality of such
trade secrets or proprietary information, or that the trade secrets or


                                      -6-
<PAGE>

proprietary know-how of the Company will not otherwise become known or be
independently developed by competitors in such a manner that the Company will
have no practical recourse.

     Titan is aware of an issued United States patent (as well as corresponding
patents and patent applications in foreign countries) relating to multidrug
resistance in mammalian cells. This patent claims substantially the same subject
matter as is claimed by certain issued United States patents that have been
licensed by Ingenex. The Company is also aware of an issued United States
patent, relating to ex vivo gene therapy. The Company believes that this patent
claims subject matter that relates to any gene therapeutic developed by Ingenex
to the extent that the introduction of the gene into the subject's cells is
performed ex vivo. Thus, it may be necessary for Ingenex to obtain a license
under either or both of such patents to pursue commercialization of its proposed
gene therapy products utilizing the MDR1 gene or ex vivo therapies, as
applicable. There can be no assurance that Ingenex will be able to obtain such
licenses or that such licenses, if available, can be obtained on terms
acceptable to Ingenex. Failure of Ingenex to obtain such licenses could have a
material adverse effect on the business, financial condition and results of
operations of Ingenex and the Company. Ingenex has received notice that three
companies are opposing the grant of a European patent which has claims directed
to the human MDR1 gene and gene fragments.

     Competition and Technological Change. Competition in the pharmaceutical and
biotechnology industries is intense and is expected to increase. The Company
will face competition from numerous companies that currently market, or are
developing, products for the treatment of diseases and disorders targeted by the
Company. Many of these entities have significantly greater research and
development capabilities, experience in obtaining regulatory approvals and
manufacturing, marketing, financial and managerial resources than the Company.
Acquisitions of or investments in competing biotechnology companies by large
pharmaceuticals companies could enhance such competitors' financial, marketing
and other resources. The Company also competes with universities and other
research institutions in the development of products, technologies and
processes. There can be no assurance that competitors of the Company will not
succeed in developing technologies or products that are more effective than the
Company or that will render the Company's products or technologies
noncompetitive or obsolete. In addition, certain of such competitors may achieve
product commercialization or patent protection earlier than the Company.

     Dependence Upon Key Collaborative Relationships and License and Sponsored
Research Agreements. The Company relies significantly on the resources of third
parties to conduct research and development. The Company's success will depend,
in part, on its ability and the ability of the Operating Companies to maintain
existing collaborative relationships and to develop new collaborative
relationships with third parties. There can be no assurance that the Company
will be successful in maintaining its existing collaborative arrangements or
that any collaborative arrangements will lead to the successful
commercialization of products.

     The license agreements relating to the in-licensing of technology that have
been or may in the future be entered into by the Company or the Operating
Companies typically require the payment of an up-front license fee and royalties
based on sales of licensed products and processes under the license and any
sublicense with minimum annual royalties, the use of due diligence in developing
and bringing products to market, the achievement of funding milestones


                                      -7-
<PAGE>

and, in some cases, the grant of stock to the licensor. The sponsored research
agreements that have been or may in the future be entered into by generally
require periodic payments on an annual or quarterly basis. Some agreements also
may require funding or production facilities relating to clinical research.
Failure to meet financial or other obligations under either license agreements
or sponsored research agreements in a timely manner, the rights to proprietary
technology or the right to have the applicable university or institution conduct
research and development efforts could be lost.

     Dependence on Third Parties for Manufacturing and Marketing Activities. To
date, the Company has not introduced any products on the commercial market. To
conduct human clinical trials and ultimately to gain market acceptance, the
products under development must be manufactured in compliance with regulatory
requirements and at acceptable costs. It is not expected that the Company will
have the resources in the foreseeable future to allocate to the manufacture or
direct marketing of any proposed products and, therefore, it is intended that
collaborative arrangements be pursued regarding the manufacture and marketing of
any products that may be successfully developed. There can also be no assurance
that additional collaborative arrangements to manufacture or market any proposed
products will be entered into or, in lieu thereof, that any manufacturing
operations can be successfully established or that any sales force can be
successfully implemented.

     Dependence on Key Personnel. The Company is highly dependent on the
services of Dr. Louis R. Bucalo, President and Chief Executive Officer, as well
as the other principal members of management and scientific staff of the Company
and the Operating Companies. The loss of one or more of such individuals could
substantially impair ongoing research and development programs and the Company's
ability to obtain additional financing. The future success of the Company
depends in large part upon its ability and that of the Operating Companies to
attract and retain highly qualified personnel. This intense competition for such
highly qualified personnel from other pharmaceutical and biotechnology
companies, as well as universities and nonprofit research organizations, and may
have to pay higher salaries to attract and retain such personnel. There can be
no assurance that sufficient qualified personnel can be hired on a timely basis
or retained. The loss of such key personnel or failure to recruit additional key
personnel could have a material adverse effect on the Company's business,
financial condition and results of operations.

     Shares Eligible for Future Sale. Future sales of the Company's Common Stock
by existing stockholders pursuant to Rule 144 under the Securities Act, pursuant
to an effective registration statement or otherwise, could have an adverse
effect on the price of the Company's securities.


                                      -8-
<PAGE>

                                USE OF PROCEEDS

     The Company will not receive any proceeds from the sale of the Shares by
the Selling Stockholder.

                                 DIVIDEND POLICY

     The Company has never paid cash dividends on its Common Stock and does not
anticipate paying cash dividends in the foreseeable future. The Company
currently intends to retain all earnings, if any, for use in the expansion of
the Company's business. The declaration and payment of future dividends, if any,
will be at the sole discretion of the Board of Directors and will depend upon
the Company's profitability, financial condition, cash requirements, future
prospects and other factors deemed relevant by the Board of Directors.


                                      -9-
<PAGE>

                               SELLING STOCKHOLDER

     In January 1997, the Company issued the Shares to the Selling Stockholder
in connection with entering into a worldwide exclusive license agreement for the
antipsychotic agent, Iloperidone (the "HMR Agreement"). Pursuant to the HMR
Agreement, the Company agreed, at the request of the Selling Stockholder, to
register the Shares under the Act to permit public secondary trading of the
Shares.The HMR Agreement obligates the Company, upon the request of the Selling
Stockholder, to pay the Selling Stockholder, in cash, the difference between (i)
$5,500,000 and (ii) the net proceeds received by the Selling Stockholder from
the sale of Shares within 10 days of receipt of written notice from the Selling
Stockholder. Notice is required to be provided upon the earlier of (i)
completion of the sale of the Shares or (ii) 120 days after the effective date
of the registration statement on Form S-3 (the "Registration Statement") of
which this Prospectus forms a part. The Selling Stockholder has notified the
Company that it intends to make such a request for payment at the appropriate
time. Any Shares remaining unsold pursuant to this Prospectus will be
surrendered to the Company.

     The Company has agreed to bear certain expenses (other than fees and
expenses, if any, of counsel to the Selling Stockholder) in connection with the
registration and sale of the Shares being offered by the Selling Stockholder.
See "Plan of Distribution." The Company has agreed to prepare and file such
amendments and supplements to the Registration Statement and Prospectus as may
be necessary to keep the Registration Statement effective as provided for in the
HMR Agreement.

     The following table sets forth certain information regarding the beneficial
ownership of Common Stock by the Selling Stockholder and as adjusted to give
effect to the sale of the Shares offered hereby.

                                                     Percentage     Number of
                                 Number of Shares     Ownership       Shares
                                Beneficially Owned    Prior to         Being
Selling Stockholder(1)         Prior to Offering(2)    Offering      Offered(2)
- ----------------------         --------------------    --------      ----------
Hoechst Marion Roussel, Inc.          594,595           4.43%         594,595

- ---------------
(1)  The address of such stockholder is 10236 Marion Park Drive, Dock 6, Kansas
     City, Missouri 64137.

                              PLAN OF DISTRIBUTION

     Pursuant to the HMR Agreement, the Selling Stockholder is obligated to sell
the Shares through a broker-dealer designated by the Company; provided that if
the Company has not designated a broker-dealer by the effective date of the
Registration Statement, the Selling Stockholder may select a broker-dealer for
such sales. The Company has not determined which, if any, broker-dealer it will
designate.


                                      -10-
<PAGE>

     Subject to the foregoing, the Selling Stockholder may sell Shares from time
to time in transactions on the Nasdaq SmallCap Market, in privately negotiated
transactions, through the writing of options on the Shares 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 Stockholder 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 Stockholder or the purchases 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).

     The Selling Stockholder 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 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 Act.

     The Company has agreed to indemnify the Selling Stockholder against certain
liabilities, including certain liabilities under the Act.

                                  LEGAL MATTERS

     The validity of the securities offered hereby have been passed upon for the
Company by Bachner, Tally, Polevoy & Misher LLP, New York, New York.


                                      -11-
<PAGE>

================================================================================
[Back Cover]

     No  dealer,  salesman  or  other  person  has been  authorized  to give any
information or to make any  representations,  other than those contained in this
Prospectus,  and, if given or made, such information or representations must not
be relied upon as having been  authorized by the Company or by the  Underwriter.
This  Prospectus  does not constitute an offer to sell, or a solicitation  of an
offer to buy, any  securities  offered hereby by anyone in any  jurisdiction  in
which such offer or solicitation is not authorized or in which the person making
such offer or  solicitation is not qualified to do so or to anyone to whom it is
unlawful  to make such offer,  or  solicitation.  Neither  the  delivery of this
Prospectus nor any sale made hereunder shall,  under any  circumstances,  create
any implication that the information  herein contained is correct as of any time
subsequent to the date of this Prospectus.

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
Available Information......................................................    2
Incorporation of Certain Documents by Reference............................    2
Prospectus Summary.........................................................    4
Risk Factors...............................................................    5
Use of Proceeds............................................................    9
Dividend Policy............................................................    9
Selling Stockholder........................................................   10
Plan of Distribution.......................................................   10
Legal Matters..............................................................   11

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

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



                           TITAN PHARMACEUTICALS, INC.





                                   PROSPECTUS






                                     [date]


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



<PAGE>

                                     PART II

                     Information Not Required in Prospectus

Item 14. Other Expenses of Issuance and Distribution

     The estimated  expenses  payable by the  Registrant in connection  with the
issuance and distribution of the securities being registered are as follows:

                                                                  Amount
                                                                  ------
     SEC Registration Fee....................................  $    910.00
     Printing and Engraving Expenses.........................     3,500.00
     Legal Fees and Expenses.................................     7,500.00
     Blue Sky Fees and Expenses..............................     3,500.00
     Accounting Fees and Expenses............................     7,500.00
                                                               -----------
              Total..........................................  $ 22,910.00
                                                               ===========

Item 15. Indemnification of Directors and Officers

     The Amended and Restated  Certificate of  Incorporation  and By-Laws of the
Registrant  provide that the Registrant  shall  indemnify any person to the full
extent  permitted by the Delaware General  Corporation Law (the "GAL").  Section
145 of the GAL, relating to  indemnification,  is hereby  incorporated herein by
reference.

     In  accordance  with  Section  102(a)(7)  of the GAL,  the  Certificate  of
Incorporation of the Registrant  eliminates the personal  liability of directors
to the  Registrant  or its  stockholders  for  monetary  damages  for  breach of
fiduciary  duty as a  director  with  certain  limited  exceptions  set forth in
Section 102(a)(7).

     The Registrant also enters into indemnification agreements with each of its
officers and directors, the form of which is filed as Exhibit 10.6 and reference
is hereby made to such form.

     In addition, the Registrant currently maintains an officers' and directors'
liability  insurance  policy  which  insures,  subject  to  the  exclusions  and
limitations of the policy, officers and directors of the Company against certain
liabilities which might be incurred by them solely in such capacities.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors,  officers or persons  controlling the Registrant,
pursuant to the foregoing provisions,  the Company has been informed that in the
opinion of the  commission  such  indemnification  is against  public  policy as
expressed in the Securities Act and is, therefore,  unenforceable.  See Item 17,
"Undertakings."

Item 16.     Exhibits

    3.1    - Restated Certificate of Incorporation of the Registrant(1)
    3.2    - Form of Amendment to Restated Certificate of Incorporation of the 
             Registrant(1)
    3.3    - By-laws of the Registrant(1)
    4.1    - Form of Bridge Note(1)
    4.2    - Bridge Warrant Agreement(1)


                                      II-1
<PAGE>

    4.3    - Form of Warrant Agreement(1) 4.4 - Form of Underwriter's Unit 
             Purchase Option(1)
    4.5    - Form of Investor Rights Agreement between the Registrant and the 
             holders of
             Series A and Series B Preferred Stock(1)
    4.6    - Form of Placement Agent's Unit Purchase Option(4)
    5.1    - Opinion of Bachner, Tally, Polevoy & Misher LLP
   10.1    - 1993 Stock Option Plan(1)
   10.2    - 1995 Stock Option Plan(1)
   10.3    - Employment Agreement between the Registrant and Louis Bucalo dated 
             February 1, 1993, amended as of February 3, 1994(1)
   10.4    - Employment Agreement between Registrant and Richard Allen dated 
             July 28, 1995(1)
   10.5    - Employment Agreement between Registrant and Sunil Bhonsle, dated 
             August 6, 1995(1)
   10.6    - Form of Indemnification Agreement(1)
  +10.9    - MDR Exclusive License Agreement between Ingenex, Inc. (formerly 
             Pharm-Gen Systems Ltd.) and the Board of Trustees of the University
             of Illinois dated May 6, 1992(1)
  +10.11   - License Agreement between Theracell, Inc. and New York University 
             dated November 20, 1992, as amended as of February 23, 1993 and as 
             of February 25, 1995(1)
  +10.12   - License Agreement between the Registrant and the Massachusetts 
             Institute of Technology dated September 28, 1995(1)
  +10.14   - Exclusive License Agreement between Ingenex, Inc. and the Board of 
             Trustees of the University of Illinois, dated July 1, 1994(1)
  +10.15   - Exclusive License Agreement between Ingenex, Inc. and the Board of 
             Trustees of the University of Illinois, dated July 1, 1994(1)
  +10.16   - License Agreement between Ingenex, Inc. and the Massachusetts 
             Institute of Technology, dated September 11,1 992(1)
  +10.17   - License Agreement between Ingenex, Inc. and Baylor College of 
             Medicine, dated October 21, 1992(1)
   10.18   - Lease for Registrant's facilities(2)
  +10.19   - License Agreement between Theracell, Inc. and the University of 
             South Florida dated March 15, 1996(3)
  +10.20   - License Agreement between Trilex Pharmaceuticals, Inc. (formerly 
             Ascalon Pharmaceuticals, Inc.) and the University of Kentucky 
             Research Foundation dated May 30, 1996(4)
  +10.22   - License Agreement between the Registrant and Hoechst Marion 
             Roussel, Inc. effective as of December 31, 1996(5)
   10.23   - Employment Agreement between Registrant and Robert E. Farrell dated
             August 9, 1996(5)
   10.24   - Financing Agreement between the Registrant and Ansan 
             Pharmaceuticals, Inc. dated March 21, 1997(6)
   10.25   - Agreement for Purchase and Sale of Assets between the Registrant 
             and Pharmaceuticals Product Development, Inc. dated June 4, 1997(6)
 ++10.27   - License Agreement between the Registrant and Bar-Ilan Research and
             Development Company Limited effective November 25, 1997


                                      II-2
<PAGE>

   10.28   -  Letter Agreement between the Registrant and Ansan Pharmaceuticals,
              Inc. dated
              November 24, 1997
   10.29   -  Stock Purchase Agreement between the Registrant and Ansan 
              Pharmaceuticals, Inc. effective November 25, 1997
 ++10.30   -  Sublicense Agreement between the Registrant and Novartis Pharma 
              AG dated November 20, 1997
   23.1    -  Consent of Bachner, Tally, Polevoy & Misher LLP - Included in 
              Exhibit 5.1
   23.2    -  Consent of Ernst & Young LLP, Independent Auditors - Included on 
              Page II-6
   24.1    -  Power of Attorney - Included on Page II-4

+    Confidential  treatment  has been  granted with respect to portions of this
     exhibit.
++   Confidential  treatment has been requested with respect to portions of this
     exhibit.
(1)  Incorporated by reference from the Registrant's  Registration  Statement on
     Form SB-2 (File No. 33-99386).
(2)  Incorporated  by  reference  from the  Registrant's  Annual  Report on Form
     10-KSB for the year ended December 31, 1995.
(3)  Incorporated by reference from the  Registrant's  Quarterly  Report on Form
     10-QSB for the period ended March 31, 1996.
(4)  Incorporated by reference from the Registrant's  Registration  Statement on
     Form SB-2 (File No. 333-13469).
(5)  Incorporated  by  reference  from the  Registrant's  Annual  Report on Form
     10-KSB for the year ended December 31, 1996.
(6)  Incorporated by reference from the  Registrant's  Quarterly  Report on Form
     10-QSB for the period ended March 31, 1997.

Item 17. Undertakings

     Undertaking Required by Item 512 of Regulation S-K.

     The  undersigned   registrant   hereby  undertakes  that,  for  purpose  of
determining  any liability  under the Securities Act of 1933, each filing of the
registrant's  annual report pursuant to Section 13(a) or 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.


                                      II-3
<PAGE>

                                   SIGNATURES

     In accordance  with 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 authorized this  Registration
Statement  or Amendment  thereto to be signed on its behalf by the  undersigned,
thereunto  duly  authorized,  in the  City of  South  San  Francisco,  State  of
California on the 15th day of December, 1997.

                                             TITAN PHARMACEUTICALS, INC.

                                             By: /s/ Louis R. Bucalo
                                                ------------------------------ 
                                             Louis R. Bucalo, M.D., President

                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS,  that each person whose  signature  appears
below under the heading "Signature" constitutes and appoints Louis R. Bucalo and
Lindsay R.  Rosenwald,  or either of them, his true and lawful  attorney-in-fact
and agent with full power of substitution and resubstitution, for him and in his
name,  place and stead,  in any and all capacities to sign any or all amendments
to this registration statement, and to file the same, with all exhibits thereto,
and other  documents in connection  therewith,  with the Securities and Exchange
Commission,  granting unto said attorneys-in-fact and agents, each acting alone,
full  power  and  authority  to do and  perform  each and  every  act and  thing
requisite and  necessary to be done in and about the premises,  as fully for all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming all that said attorneys-in-fact and agents, each acting alone, or his
substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     In accordance  with the  requirements  of the Securities Act of 1933,  this
Registration  Statement  or Amendment  thereto has been signed by the  following
persons in the capacities and on the dates stated.

    Signature                            Title                     Date
    ---------                            -----                     ----

  /s/ Louis R. Bucalo             President, Chief Executive   December 15, 1997
- --------------------------------  Officer and Director       
Louis R. Bucalo, M.D.             (principal executive 
                                  officer)

 /s/ Ernst Gunter-Afting          Director                     December 15, 1997
- --------------------------------
Ernst Gunter-Afting                                            

 /s/ Victor J. Bauer              Director                     December 15, 1997
- --------------------------------
Victor J. Bauer                                                

  /s/ Michael K. Hsu              Director                     December 15, 1997
- --------------------------------
Michael K. Hsu                                                 

  /s/ Hubert E. Huckel            Director                     December 15, 1997
- --------------------------------
Hubert E. Huckel, M.D.                                         

 /s/ Marvin E. Jaffe, M.D.        Director                     December 15, 1997
- --------------------------------
Marvin E. Jaffe, M.D.                                          

  /s/ Lindsay A. Rosenwald        Director                     December 15, 1997
- --------------------------------
Lindsay A. Rosenwald, M.D.                                     

  /s/ Konrad M. Weis              Director                     December 15, 1997
- --------------------------------
Konrad M. Weis, Ph.D.                                          

  /s/ Kenneth J. Widder           Director                     December 15, 1997
- --------------------------------
Kenneth J. Widder, M.D.                                        

  /s/ Robert E. Farrell           Executive Vice President     December 15, 1997
- --------------------------------  and Chief Financial Officer                   
Robert E. Farrell                 (principal financial                          
                                  and accounting officer)         


                                      II-4
<PAGE>

                               CONSENT OF COUNSEL

     The consent of Bachner,  Tally,  Polevoy & Misher LLP is  contained  in its
opinion filed as Exhibit 5.1 to the Registration Statement.


                                      II-5

<PAGE>

                CONSENT OF ERNST & YOUNG LLP,INDEPENDENT AUDITORS

     We consent to the incorporation by reference in the Registration  Statement
(Form  S-3) and  related  Prospectus  of  Titan  Pharmaceuticals,  Inc.  for the
registration  of 594,595 shares of its Common Stock of our report dated February
21,  1997  with  respect  to the  consolidated  financial  statements  of  Titan
Pharmaceuticals,  Inc.  included in its annual report filed with the  Securities
and Exchange Commission for the year ended December 31, 1996.

Palo Alto, California                                          ERNST & YOUNG LLP
December 12, 1997


                                      II-6



Exhibit 5.1

Titan Pharmaceuticals, Inc.
400 Oyster Point Blvd., Suite 505
South San Francisco, California  94080

Re:
    Registration Statement on Form S-3

Gentlemen:

     We have acted as counsel to Titan Pharmaceuticals, Inc., a Delaware
corporation (the "Company"), in connection with the preparation of a
registration statement on Form S-3 (the "Registration Statement") filed with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "Act"), relating to the registration of an aggregate of 594,595 shares (the
"Shares") of the common stock, par value $.001 per share, of the Company (the
"Common Stock") for resale by Hoechst Marion Roussel, Inc. (the "Selling
Stockholder").

     In this connection, we have reviewed (a) the Registration Statement; (b)
the Company's Restated Certificate of Incorporation and Bylaws; (c) the form of
License Agreement between the Company and the Selling Stockholder effective as
of December 31, 1996; and (d) certain records of the Company's corporate
proceedings as reflected in its minute books. In our examination, we have
assumed the genuineness of all signatures, the authenticity of all documents
submitted to us as originals and the conformity with the original of all
documents submitted to us as copies thereof. Where factual matters relevant to
such opinion were not independently established, we have relied upon
certificates of officers and responsible employees and agents of the Company.
Our opinion set forth below is limited to the General Corporation Law of the
State of Delaware.

     Based upon the foregoing, it is our opinion that the Shares have been duly
and validly authorized and issued and are fully paid and nonassessable.

     We hereby consent to the use of this opinion as Exhibit 5.1 to the
Registration Statement and to all references to our firm in the Registration
Statement. In giving this consent, we do not thereby concede that we come within
the categories of persons whose consent is required by the Act or the General
Rules and Regulations promulgated thereunder.

                                                   Very truly yours,

                                        /s/ BACHNER, TALLY, POLEVOY & MISHER LLP



PORTIONS  OF  THIS  EXHIBIT  HAVE  BEEN  OMITTED   PURSUANT  TO  A  REQUEST  FOR
CONFIDENTIAL TREATMENT. THE OMITTED PORTIONS,  MARKED BY AN * AND [ ], HAVE BEEN
SEPARATELY FILED WITH THE COMMISSION.

Exhibit 10.27

                                LICENSE AGREEMENT

     This License Agreement (hereinafter referred to as the License Agreement),
effective as of the 25th day of November, 1997 is made by and between Bar-Ilan
Research and Development Company Ltd., a company duly organized and existing
under the laws of the State of Israel and having a principal place of business
at Bar-Ilan University, PO Box 1530, Ramat Gan 52115, Israel (BAR-ILAN), and
Titan Pharmaceuticals, Inc., a corporation duly organized and existing under the
laws of the State of Delaware and having a principal place of business at 400
Oyster Point Boulevard, Suite 505, South San Francisco, California 94080, USA
(TITAN).

     WHEREAS, BAR-ILAN is entering this License Agreement on its own behalf, and
as representative and trustee for Bar-Ilan University (the University) and MOR -
Research Applications Ltd. (MOR), and represents that it has been authorized by
the University and MOR to make the representations and undertakings contained
herein; and

     WHEREAS, BAR-ILAN has the right to grant licenses under the Patent Rights
(as later defined) and whereas TITAN desires to obtain a license upon the terms
and conditions hereinafter set forth; and

     WHEREAS, TITAN has represented to BAR-ILAN, to induce BAR-ILAN to enter
into this License Agreement, that it shall commit itself to a thorough, vigorous
and diligent program of exploiting the Patent Rights and know-how of BAR-ILAN,
so that public utilization shall result therefrom; and

     WHEREAS, BAR-ILAN and Ansan Pharmaceuticals, Inc., a corporation duly
organized and existing under the laws of the State of Delaware and having a
principal place of business at 400 Oyster Point Boulevard, Suite 435, South San
Francisco, California 94080, USA (ANSAN) have entered into a previous license
agreement, effective as of October 31, 1992; and

     WHEREAS, BAR-ILAN and ANSAN mutually agree to terminate that previous
license agreement and replace it with this License Agreement and a parallel
license agreement between BAR-ILAN and ANSAN.

<PAGE>

     NOW, THEREFORE, it is agreed as follows:

                             ARTICLE I - DEFINITIONS

     For the purposes of this License Agreement, the following words and phrases
shall have the following meanings:

     1.1. "AFFILIATE" shall mean any company or entity, the voting control of
which is at least fifty percent (50%), directly or indirectly, owned or
controlled by TITAN or which, directly or indirectly, owns or controls at least
fifty percent (50%) of TITAN or which is under common control with TITAN.
AFFILIATE shall also mean any entity in fact effectively controlled by or under
common control with TITAN.

     1.2. "Patent Rights" shall mean Israeli Patent Applications Nos. 83389 and
87072, filed July 30, 1987 and July 11, 1988, respectively; and any applications
claiming priority or benefit directly or indirectly from either or both of them,
including any continuations, continuations-in-part, and divisionals thereof; and
any patents issuing from any of the foregoing, including any reissues,
reexaminations, and extensions thereof; as set forth in Appendix I.

     1.3. "Licensed Product(s)" shall mean:

          1.3.1. Any product which is covered in whole or in part by a valid and
unexpired claim contained in the Patent Rights in the country in which the
product is made, used, leased, or sold;

          1.3.2. Any product which is manufactured by using a process which is
covered in whole or in part by a valid and unexpired claim contained in the
Patent Rights in the country in which the process is used;

          1.3.3. Any product which is used according to a method which is
covered in whole or in part by a valid and unexpired claim contained in the
Patent Rights in the country in which the method is used.


<PAGE>

     1.4. "Licensed Process(es)" shall mean any process or method, which is
covered, in whole or in part, by a valid and unexpired claim contained in the
Patent Rights in the country in which the process or method is used.

     1.5. "TITAN Field" shall mean: (a) with respect to butylidene dibutyrate
(sometimes referred to as AN-10), non-topical applications for oncologic
disorders; and (b) with respect to all other products within the Patent Rights,
all indications and routes of administration except (i) the treatment of
(-hemoglobinopathies ((-globin disorders) and (ii) topical applications other
than oncologic disorders. The term oncologic disorders shall not include
chemotherapy-or radiotherapy-induced alopecia.

     1.6. "Net Sales" shall mean TITAN's or an AFFILIATEs billings for Licensed
Products and Licensed Processes, less the sum of the following:

          (a)  discounts allowed in amounts customary in the trade;
          (b)  sales, tariffs, duties, and/or use taxes directly imposed on and
               with reference to particular sales;
          (c)  outbound transportation prepaid or allowed;
          (d)  amounts allowed or credited on returns; and
          (e)  bad debt deductions actually written off during the period.

     No deductions shall be made for commissions paid to individuals whether
they be independent sales agencies or regularly employed by TITAN or an
AFFILIATE and on their payroll. Licensed Products and Licensed Processes shall
be considered sold when billed out or invoiced.

                                ARTICLE 2 - GRANT

     2.1. BAR-ILAN hereby grants to TITAN a worldwide license to practice under
the Patent Rights, and to make, have made, use, lease, and/or sell the Licensed
Products in the TITAN Field and to practice the Licensed Processes in the TITAN
Field, said license being perpetual unless sooner terminated as hereinafter
provided and subject to the payment of royalties

<PAGE>

as hereinafter provided,  and said license to include the right to sublicense in
the TITAN Field and to be exclusive to TITAN in the TITAN Field.

     2.2. TITAN agrees that any sublicenses granted by it shall provide for the
same obligations as those obligations imposed only by this License Agreement.

     2.3. TITAN agrees to forward to BAR-ILAN annually a copy of such reports
received from any sublicensee as may be pertinent to an accounting of royalties,
as well as copies of all sublicense agreements entered into by TITAN in
connection with the Patent Rights.

                            ARTICLE 3 - DUE DILIGENCE

     3.1. TITAN shall use its reasonable best efforts to bring Licensed Products
or Licensed Processes to market through a thorough, vigorous and diligent
program for exploitation of the Patent Rights and continue active, diligent
marketing efforts for Licensed Products or Licensed Processes throughout the
life of this Agreement.

     3.2. TITAN shall endeavor to use the Rabin Medical Center in Petach-Tikva,
Israel, as one of the sites to conduct human clinical trials of the Licensed
Products provided that US Food and Drug Administration (FDA) protocols and
standards can be achieved and the cost per patient is competitive with the
United States.

                              ARTICLE 4 - ROYALTIES

     4.1. For the rights, privileges, and license granted hereunder, TITAN shall
pay to BAR-ILAN, as set forth below, either (i) until the expiration of the last
applicable patent within the Patent Rights on any Licensed Product or Licensed
Process in the country in which such Licensed Process is used or such Licensed
Product is made, used, leased, or sold, after which time TITANs license shall
become fully paid-up and perpetual in such country; or (ii) until this License
Agreement shall be terminated as hereinafter provided:

<PAGE>

The  information  below,  marked by * and [ ], has been  omitted  pursuant  to a
request for  confidential  treatment.  The omitted  portion had been  separately
filed with the Commission.

          4.1.1. In each calendar year, a royalty in an amount equal to [*****]
of Net Sales of the Licensed Products or Licensed Processes leased or sold by
TITAN or an AFFILIATE.

          4.1.2. In each calendar year, a royalty in an amount equal to [*****]
of the royalties, fees, or any other lump sum received by TITAN or an AFFILIATE
from its sublicensees for the use, lease, or sale of Licensed Products and
Licensed Processes. TITAN shall not sell or sublicense the use, lease, sale, or
other disposition of Licensed Products or Licensed Processes to an AFFILIATE of
TITAN without obtaining the prior written consent of BAR-ILAN, which consent
shall not unreasonably be withheld.

          4.1.3. To maintain the exclusivity of TITANs license to the Patent
Rights, TITAN shall pay minimum annual royalties in accordance with the
following schedule:

                  (a)  On October 31, 1998, a minimum of .............   [*****]
                  (b)  Each calendar year thereafter, a minimum of ...   [*****]

     4.2. No multiple royalties shall be payable because use, lease, or sale of
any Licensed Product or Licensed Process is, or shall be, covered by more than
one valid and unexpired claim contained in the Patent Rights.

     4.3. Royalty payments shall be paid in United States Dollars in New York or
at such other place as BAR-ILAN may reasonably designate consistent with the
laws and regulations controlling in any foreign country. Any withholding taxes
which TITAN or any sublicensee shall be required by law to withhold on
remittance of the royalty payments shall be deducted from the royalty paid to
BAR-ILAN. TITAN shall furnish BAR-ILAN the original copies of all official
receipts for such taxes. If a currency conversion shall be required in
connection with the payment of royalties hereunder, such conversion shall be
made using the exchange rate prevailing at Citibank, NA in New York on the last
business day of the calendar quarterly reporting period to which such royalty
payments relate.

<PAGE>

The information below, marked by * and [ ], has been omitted pursuant to a
request for confidential treatment. The omitted portion had been separately
filed with the Commission.

     4.4. In all cases, the price utilized to determine Net Sales employed in
the computation of royalties shall be a genuine and objective selling price
which would otherwise be established in a bona fide arms length transaction
between unrelated and independent parties which have no affiliation or other
interest which might affect such genuine and objective selling price. TITAN
covenants not to engage in manipulative transfer pricing, distribution of
Licensed Products which are not commercially reasonable, or any other means to
avoid the intended application of this Article 4. In the event Licensed Products
are used or otherwise disposed of by TITAN to an AFFILIATE or any other party at
a price which is less than a genuine and objective selling price, as described
herein, the price utilized to determine Net Sales employed in the computation of
royalties shall be the prevailing price of the identical type of Licensed
Products sold or leased by TITAN to independent and unrelated third parties. In
the event that TITAN shall not have customarily sold or leased the identical
type of Licensed Products to independent and unrelated third parties then the
price employed in the computation of royalties shall be set at [*****] of the
full cost of production, including all direct costs and full overhead, for such
Licensed Products sold.

     4.5. In addition to any royalties payable under Paragraph 4.1, if TITAN, or
an AFFILIATE or sublicensee of TITAN, receives approval from the US FDA to
market a Licensed Product in the TITAN Field (as those terms are used in this
License Agreement) before ANSAN, or an AFFILIATE or sublicensee of ANSAN,
receives approval from the US FDA to market a Licensed Product in the ANSAN
Field (as those terms are used in the License Agreement between BAR-ILAN and
ANSAN), then TITAN shall pay to BAR-ILAN four additional payments of [******]
each: the first within 90 days of receiving the approval, the second within 180
days of receiving the approval, the third within 270 days of receiving the
approval, and the fourth within 360 days of receiving the approval.

                         ARTICLE 5 - REPORTS AND RECORDS

     5.1. TITAN shall keep full, true and accurate books of account containing
all particulars that may be necessary to the purpose of showing the amount
payable to BAR-ILAN by way of royalty as aforesaid. Said books of account shall
be kept at TITAN's principal place of business. Said books and the supporting
data shall be open upon reasonable notice to TITAN and no more than twice per
calendar year, for five (5) years following the

<PAGE>

end of the calendar year to which they pertain, for inspection by the BAR-ILAN
Internal Audit Division and/or by an independent certified public accountant
employed by BAR-ILAN, to which TITAN has no reasonable objection, for the
purpose of verifying TITAN's royalty statement or compliance in other respects
with this License Agreement.

     5.2. TITAN, within sixty (60) days after the end each quarter of each
calendar year, shall deliver to BAR-ILAN true and accurate reports, giving such
particulars of the business conducted by TITAN during the preceding quarter
under this License Agreement as shall be pertinent to a royalty accounting
hereunder. These shall include at least the following:

               (a)  All Licensed Products and Licensed Processes used, leased,
                    or sold by or for TITAN, its AFFILIATES and sublicensees.

               (b)  Total amounts invoiced for Licensed Products and Licensed
                    Processes used, leased, or sold by or for TITAN, its
                    AFFILIATES and sublicensees.

               (c)  Deductions applicable in computed "Net Sales as defined in
                    Paragraph 1.6.

               (d)  Total royalties due based on Net Sales by or for TITAN, its
                    AFFILIATES and sublicensees.

               (e)  Names and addresses of all AFFILIATES and sublicensees of
                    TITAN. (f) On an annual basis, TITAN's Annual Report.

     5.3. With each such report submitted, TITAN shall pay to BAR-ILAN the
royalties due and payable under this License Agreement. If no royalties (other
than the minimum royalty pursuant to Paragraph 4.1.3) shall be due, TITAN shall
so report.

                         ARTICLE 6 - PATENT PROSECUTION

     6.1. TITAN, at its own expense and utilizing patent counsel of its choice
selected in consultation with BAR-ILAN, shall have the sole right and obligation
for the filing, prosecution, and maintenance of the Patent Rights. TITAN, or its
patent counsel, shall provide BAR-ILAN

<PAGE>

with copies of all correspondence and documents filed with, or received from,
any patent office or patent agent. In addition, TITAN agrees that any and all
official or ribbon copies of issued patents shall be forwarded to, and retained
by, BAR-ILAN.

     6.2. BAR-ILAN and TITAN agree for the benefit of ANSAN that neither shall
take any action in regard to prosecution of the Patent Rights (including by
reexamination, reissue, or the like) that could result in any diminution of
rights with respect to any claims covering rights outside the TITAN Field, in
particular, to any composition of matter claims relating to butylidene
dibutyrate, except with the consent of ANSAN.

                             ARTICLE 7 - TERMINATION

     7.1. If TITAN shall become bankrupt or insolvent, shall file a petition in
bankruptcy, or if the business of TITAN shall be placed in the hands of a
receiver, assignee, or trustee for the benefit of creditors, whether by the
voluntary act of TITAN or otherwise, this License Agreement shall automatically
terminate.

     7.2. Should TITAN fail in its payment to BAR-ILAN of royalties due in
accordance with the terms of this License Agreement which are not the subject of
a bona fide dispute between BAR-ILAN and TITAN, BAR-ILAN shall have the right to
serve notice upon TITAN, by certified mail to the address designated in Article
13 hereof, of its intention to terminate this License Agreement within sixty
(60) days after receipt of said notice of termination unless TITAN shall pay to
BAR-ILAN, within the sixty (60) day period, all such royalties due and payable.
Upon the expiration of the sixty (60) day period, if TITAN shall not have paid
all such royalties due and payable, the rights, privileges and license granted
hereunder shall thereupon immediately terminate.

     7.3. Upon any material breach or default of this License Agreement
(including without limitation, the failure to submit annual reports as provided
under Paragraph 5.2) by TITAN, other than those occurrences set out in
Paragraphs 7.1 and 7.2 hereinabove, which shall always take precedence in that
order over any material breach or default referred to in this Paragraph 7.3,
BAR-ILAN shall have the right to terminate this License Agreement and the
rights, privileges and

<PAGE>

license granted hereunder by ninety (90) days' notice to TITAN by certified mail
to the address designated in Article 13 hereof. Such termination shall become
effective unless TITAN shall have cured any such breach or default capable of
being cured prior to the expiration of the ninety (90) day per from receipt of
the notice of termination.

     7.4. TITAN shall have the right to terminate this License Agreement at any
time on nine (9) months notice by certified mail to BAR-ILAN.

     7.5. Upon termination of this License Agreement for any reason, nothing
herein shall be construed to release either party from any obligation that
matured prior to the effective date of such termination. TITAN and/or any
sublicensee thereof may, however, after the effective date of such termination,
sell all Licensed Products, and complete Licensed Products in the process of
manufacture at the time of such termination, and sell the same, provided that
TITAN shall pay to BAR-ILAN the royalties therein as required by Article 4 of
this License Agreement and shall submit the reports required by Article 5 hereof
on the sales of Licensed Products.

     7.6. Upon the termination of this License Agreement, TITAN shall (except to
the extent necessary to complete the manufacture and sale of Products permitted
under Paragraph 7.5 above): (i) return to BAR-ILAN any materials still in its
possession provided to it by BAR-ILAN pursuant to this License Agreement; (ii)
maintain the confidentiality of all proprietary, non-public information provided
to it by BAR-ILAN; and (iii) not use the Licensed Products or other information
disclosed pursuant to this License Agreement in any way in connection with its
business.

     7.7. Upon the termination of this License Agreement for any reason,
existing sublicense agreements pertaining to Licensed Products entered into by
TITAN pursuant to this License Agreement shall at BAR-ILANs option be assigned,
upon such termination, from TITAN to BAR-ILAN or to BAR-ILANs designee.

                             ARTICLE 8 - ARBITRATION

     8.1. Except as to issues relating to the validity, enforceability, or
infringement of any patent contained in the Patent Rights licensed hereunder,
any and all claims, disputes, or

<PAGE>

controversies arising under, out of, or in connection with this License
Agreement, which have not been resolved by good faith negotiations between the
parties, shall be resolved by final and binding arbitration to be held in Tel
Aviv under the rules of the American Arbitration Association then in effect. The
arbitrators shall have no power to add to, subtract from, or modify any of the
terms or conditions of this License Agreement. Any award rendered in such
arbitration may be enforced by either party in any court having jurisdiction.

     8.2. Any claim, dispute, or controversy concerning the validity,
enforceability, or infringement of any patent contained in the Patent Rights
licensed hereunder shall be. resolved in any court having jurisdiction thereof.
In the event TITAN institutes a proceeding to contest the validity or
enforceability of the Patent Rights, all royalties owed by TITAN under Article 4
of this License Agreement shall continue to be paid by TITAN until such
proceeding is resolved, after appeals if any.

     8.3. In the event that, in any arbitration proceeding, any issue shall
arise concerning the validity, enforceability, or infringement of any patent
contained in the Patent Rights licensed hereunder, the arbitrators shall, to the
extent possible, resolve all issues other than validity, enforceability, and
infringement; in any event, the arbitrators shall not delay the arbitration
proceeding for the purpose of obtaining or permitting either party to obtain
judicial resolution of such issues, unless an order staying the arbitration
proceeding shall be entered by a court of competent jurisdiction. Neither party
shall raise any issue concerning the validity, enforceability, or infringement
of any patent contained in the Patent Rights licensed hereunder in any
proceeding to enforce any arbitration award hereunder, or in any proceeding
otherwise arising out of any such arbitration award.

                   ARTICLE 9 - INFRINGEMENT AND OTHER ACTIONS

     9.1. TITAN and BAR-ILAN shall promptly provide written notice to the other
party of any alleged infringement by a third party of the Patent Rights within
the TITAN Field and provide such other party with any available evidence of such
infringement.

<PAGE>

     9.2. During the term of this Agreement, TITAN shall have the right, but not
the obligation, to prosecute and/or defend, at its own expense and utilizing
counsel of its choice, any infringement of and/or challenge to the Patent Rights
within the TITAN Field. In furtherance of such right, BAR-ILAN hereby agrees
that TITAN may join BAR-ILAN as a party in any such suit, without expense to
BAR-ILAN. No settlement, consent judgment, or other voluntary final disposition
of any such suit may be entered into without the consent of BAR-ILAN, which
consent shall not unreasonably be withheld. TITAN shall indemnify BAR-ILAN
against any order for costs that may be made against BAR-ILAN in any such suit.

     9.3. Any recovery of damages by TITAN in any such suit shall be applied
first in satisfaction of any unreimbursed expenses and legal fees of TITAN
relating to the suit. The balance remaining from any such recovery shall be
treated as royalties received by TITAN from sublicensees and shared by BAR-ILAN
and TITAN in accordance with Paragraph 4.1.2 hereof.

     9.4. If within six (6) months after receiving notice of any alleged
infringement within the TITAN Field, TITAN shall have been unsuccessful in
persuading the alleged infringer to desist, or shall not have brought and shall
not be diligently prosecuting an infringement action, or if TITAN shall notify
BARILAN, at any time prior thereto, of its intention not to bring suit against
the alleged infringer, then, and in those events only, BAR-ILAN shall have the
right, but not the obligation, to prosecute, at its own expense and utilizing
counsel of its choice, any infringement of the Patent-Rights within the TITAN
Field, and BAR-ILAN may, for such purposes, join TITAN as a party plaintiff. The
total cost of any such infringement action commenced solely by BAR-ILAN shall be
borne by BAR-ILAN and BAR-ILAN shall keep any recovery or damages for past
infringement derived therefrom.

     9.5. In any suit to enforce and/or defend the Patent Rights pursuant to
this License Agreement, the party not in control of such suit shall, at the
request and expense of the controlling party, cooperate in all respects and, to
the extent possible, have its employees testify when requested and make
available relevant records, papers, information, samples, specimens, and the
like.

<PAGE>

     9.6. BAR-ILAN and TITAN agree for the benefit of ANSAN that, before either
of them shall commence or respond to a suit to enforce and/or defend the Patent
Rights, they shall consult with ANSAN in good faith to the extent legally
permissible to ensure that no action shall jeopardize the legitimate interests
of ANSAN in the Patent Rights. TITAN further agrees that it will cooperate in
good faith with ANSAN to establish an agreement for shared responsibility and/or
cost of enforcement and/or defense to the extent that such enforcement and/or
defense implicates both the ANSAN Field and the TITAN Field.

                         ARTICLE 10 - PRODUCT LIABILITY

     10.1. BAR-ILAN, by this License Agreement, makes no representation as to
the patentability and/or breadth of the inventions contained in the Patent
Rights. BAR-ILAN, by this License Agreement, makes no representation as to
patents now held or which will be held by others in the field of the Licensed
Products for a particular purpose.

     10.2. TITAN agrees to defend, indemnify, and hold BAR-ILAN, the University
and MOR harmless from and against all liability, demands, damages, expense, or
losses for death, personal injury, illness, or property damage arising (a) out
of the use by TITAN or its transferees of inventions licensed or information
furnished under this License Agreement, or (b) out of any use, sale, or other
disposition by TITAN or its transferees of products made by use of such
inventions or information. As used in this clause, BAR-ILAN includes the
Trustees, Officers, Agents, Employees and Students of BAR-ILAN, the University,
and MOR, and TITAN includes its AFFILIATES, Contractors and Sub-contractors.

                             ARTICLE 11 - ASSIGNMENT

     TITAN may assign or otherwise transfer this License Agreement and the
license granted hereunder, and the rights acquired by it hereunder so long as
such assignment or transfer shall be accompanied by a sale or other transfer of
TITAN's entire business or of that part of TITAN's business to which the license
granted hereunder relates. TITAN shall give BAR-ILAN thirty (30) days prior
written notice within which to reasonably object to such assignment or transfer.
If within thirty (30) days after the giving of such notice, no written objection
is received by TITAN,

<PAGE>

BAR-ILAN shall be deemed to have approved such assignment or transfer; provided,
however, BAR-ILAN shall not be deemed to have approved such assignment and
transfer unless such assignee or transferee shall have agreed in writing to be
bound by the terms and conditions of this License Agreement. If, within such
thirty (30) day period, BAR-ILAN provides written notice of reasonable objection
to such assignment or transfer, then no such assignment or transfer shall be
made and, if made, shall be deemed null and void. Upon such assignment or
transfer and agreement by such assignee or transferee, the term TITAN as used
herein shall mean such assignee or transferee. If TITAN shall sell or otherwise
transfer its entire business or that part of its business to which the license
granted hereby relates and the transferee shall not have agreed in writing to be
bound by the terms and conditions of this License Agreement, or new terms and
conditions shall not have been reasonably agreed upon within sixty (60) days of
such tale or transfer, BAR-ILAN shall have the right to terminate this License
Agreement.

                          ARTICLE 12 - NON-USE OF NAMES

     TITAN shall not use the name of BAR-ILAN or MOR or any adaptation thereof
in any advertising, promotional, or sales literature without prior written
consent obtained from BARILAN, in each case, except that TITAN may state that it
is licensed by BAR-ILAN under one or more of the patents and/or applications
comprising the Patent Rights.

             ARTICLE 13 - PAYMENTS, NOTICES AND OTHER COMMUNICATIONS

     Any payment, notice, or other communication pursuant to this License
Agreement shall be sufficiently made or given on the date of mailing if sent to
such party by certified first class mail, postage prepaid, addressed to it at
its address below or as it shall designate by written notice given to the other
party:

           In the case of BAR-ILAN:

                 Bar-Ilan Research & Development Company Ltd.
                 Bar-Ilan University
                 PO Box 1530
                 Ramat Gan 52115
                 Israel

<PAGE>

           In the case of TITAN:

                 Titan Pharmaceuticals, Inc.
                 400 Oyster Point Boulevard, Suite 505
                 South San Francisco, California 94080
                 USA

                           ARTICLE 14 - EFFECTIVENESS

     This License Agreement shall become effective and binding on the parties
hereto upon the closing of the Agreement and Plan of Reorganization dated July
16, 1997 by and between ANSAN and Discovery Laboratories, Inc.

                      ARTICLE 15 - MISCELLANEOUS PROVISIONS

     15.1. This License Agreement shall be construed, governed, interpreted and
applied in accordance with the laws of the State of Israel, except that
questions affecting the validity, enforceability, or infringement of any patent
contained in the Patent Rights shall be determined by the law of the country in
which the patent was granted.

     15.2. The parties hereto acknowledge that this License Agreement sets forth
the entire agreement and understanding of the parties hereto as to the subject
matter hereof, and shall not be subject to any change or modification except by
the execution of a written instrument subscribed to by the parties hereto.

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

     15.4. TITAN agrees to mark the Licensed Products sold in the United States
with all applicable United States patent numbers. All Licensed Products shipped
to, or sold in, other countries shall be marked in such a manner as to conform
with the patent laws and practice of the country of manufacture or sale.

<PAGE>

     15.5. The failure of either party to assert a right hereunder or to insist
upon compliance with any term or condition of this License Agreement shall not
constitute a waiver of that right or excuse a similar subsequent failure to
perform any such term or condition by the other party.

     IN WITNESS WHEREOF, the parties hereto have executed this License
Agreement, in duplicate, by proper persons thereunto duly authorized.

BAR-ILAN                                             TITAN

By: /s/ AMITZOR SHLASKY                     By:  /s/ SUNIL BHONSLE
   -----------------------------               ------------------------------
Name:    Amitzor Shlasky                    Name:    Sunil Bhonsle
Title:   Managing Director                  Title:   Exec. V.P. and COO
Date:    13-11-97                           Date:    11/24/97

<PAGE>

                                  APPENDIX I
 
               Application 
Country        No.            Filing Date      Patent No.    Issue Date

Israel         83389          July 30, 1987    83389         December 23, 1993
                           
Israel         87072          July 11, 1988    87072         November 19, 1993
                           
Austria*       88111971.3     July 25, 1988    95164         September 29, 1993
                           
Belgium*       88111971.3     July 25, 1988    0 302 349     September 29, 1993
                           
Canada         573,518        July 29, 1988    1,327,595     March 8, 1994
                           
France*        88111971.3     July 25, 1988    0 302 349     September 29, 1993
                           
Germany*       88111971.3     July 25, 1988    3884517       September 29, 1993
                           
Great                      
  Britain*     88111971.3     July 25, 1988    0 302 349     September 29, 1993
                           
Greece*        88111971.3     July 25, 1988    0 302 349     September 29, 1993
                           
Italy*         88111971.3     July 25, 1988    0 302 349     September 29, 1993
                           
Japan          191,981/88     July 30, 1988    --            --
                           
Luxembourg*    88111971.3     July 25, 1988    0 302 349     September 29, 1993

Netherlands*   88111971.3     July 25, 1988    0 302 349     September 29, 1993

Spain*         88111971.3     July 25, 1988    2045028       September 29, 1993

Sweden*        88111971.3     July 25, 1988    0 302 349     September 29, 1993

Switzerland*   88111971.3     July 25, 1988    0 302 349     September 29, 1993

USA            07/223,595     July 25, 1988    5,200,553     April 6, 1993
                           
*   Based on European Patent Application No. 88111971.3, filed July 25, 1988;
    European Patent No. 0 302 349, granted September 29, 1993



Exhibit 10.28

                                                 November 24, 1997

Titan Pharmaceuticals, Inc.
400 Oyster Point Boulevard, Suite 505
South San Francisco, CA  94080
Attention:  Sunil Bhonsle

Ladies and Gentlemen:

     This letter sets forth our agreement regarding the conduct of and payment
for certain dispute resolution matters arising from the License Agreement
between Bar-Ilan University (Bar-Ilan) and Titan; and for the partial
reimbursement of certain moneys to be paid under the License Agreement between
Bar-Ilan and Titan and the corresponding License Agreement between Bar-Ilan and
Ansan.

     In the event of any dispute between Bar-Ilan and Titan arising from or
relating to the License Agreement between Bar-Ilan and Titan, Titan shall
promptly notify Ansan, and Ansan and Titan shall have the right jointly to
commence, control and resolve any litigation or arbitration with Bar-Ilan with
counsel of their selection. The parties shall share equally the cost of such
litigation or arbitration (including the reasonable cost of counsel), provided
that Ansan shall not be required to share any judgment or award entered against
Titan, citing Titan to be at fault. Any amounts payable by Ansan to Titan under
this paragraph shall be creditable against any amounts then owing by Titan to
Ansan under Article 2 of the Stock Purchase Agreement between Titan and Ansan.

     Under Paragraph 4.5 of the License Agreement between Bar-Ilan and Titan,
and under Paragraph 4.5 of the corresponding License Agreement between Bar-Ilan
and Ansan, whichever of Titan and Ansan first receives approval from the US Food
and Drug Administration to market a Licensed Product in its Field (as defined in
its License Agreement) becomes obliged to pay Bar-Ilan the sum of $200,000 in
four payments over the 360 days following receipt of the approval. As long as
both the License Agreement between Bar-Ilan and Titan and the License Agreement
between Bar-Ilan and Ansan remain in effect, if either of Titan or Ansan
receives such an approval and thereby becomes obliged to pay Bar-Ilan under
Paragraph 4.5 of its License Agreement, and the other of Titan or Ansan
subsequently receives such an approval, then that second party to receive
approval shall reimburse the first party to receive approval one-half of the
payments the first party has made or will make to Bar-Ilan under Paragraph 4.5
of the first party's License Agreement.

<PAGE>

     Please confirm by your signature below that the above sets forth your
agreement in this matter.

                                                Yours very truly,
                                                Ansan Pharmaceuticals, Inc.


                                                By:/s/ Vaughan Shalson
                                                   ---------------------------
                                                    Vaughan Shalson

So Agreed.
Titan Pharmaceuticals, Inc.

By:/s/ Sunil Bhonsle
   -------------------------
    Sunil Bhonsle


                                       -2-



Exhibit 10.29

                            STOCK PURCHASE AGREEMENT

     This Stock Purchase Agreement (hereinafter referred to as the "Agreement")
effective as of the 25th day of November, 1997 is made by and between Ansan
Pharmaceuticals, Inc., a corporation duly organized and existing under the laws
of the State of Delaware and having a principal place of business at 400 Oyster
Point Boulevard, Suite 435, South San Francisco, California 94080, USA ("ANSAN")
and Titan Pharmaceuticals, Inc., a corporation duly organized and existing under
the laws of the State of Delaware and having a principal place of business at
400 Oyster Point Boulevard, Suite 505, South San Francisco, California 94080,
USA ("TITAN").

     WHEREAS, TITAN is the principal stockholder of ANSAN; and WHEREAS,

     ANSAN has licensed patent rights pursuant to the terms of a License
Agreement (the "Original ANSAN License") dated as of October 31, 1992 by and
between ANSAN and Bar-Ilan Research and Development Company Ltd., a company duly
organized and existing under the laws of the State of Israel and having a
principal place of business at Bar-Ilan University, PO Box 1530, Ramat Gan
52115, Israel ("BAR-ILAN"); and

     WHEREAS, the parties to this Agreement have previously entered into a
Sublicense Agreement (the "Sublicense") dated as of July 15, 1997, under which
ANSAN granted a sublicense to TITAN of certain rights under the Original ANSAN
License in return for transfer to ANSAN of all the ANSAN securities owned by
TITAN and payment by TITAN to ANSAN of a royalty on Net Sales of the sublicensed
compounds; and

     WHEREAS, BAR-ILAN, ANSAN, and TITAN mutually agree to terminate the
Original ANSAN License and the Sublicense, and replace them with License
Agreements between BAR-ILAN and ANSAN (the "New ANSAN License") and between
BAR-ILAN and TITAN (the "TITAN License") and with this Agreement.

     NOW, THEREFORE, it is agreed as follows:

<PAGE>

1. Definitions

     For the purposes of this Agreement, the following words and phrases shall
have the following meanings:

     1.1. "AFFILIATE" of TITAN shall have the meaning set forth in Paragraph 1.1
of the TITAN License.

     1.2. "AN-9" shall mean pivaloyloxymethyl butyrate.

     1.3. "Discovery" shall mean Discovery Laboratories, Inc., a corporation
duly organized and existing under the laws of the State of Delaware and having a
principal place of business at 509 Madison Avenue, New York, New York 10022

     1.4. "Licensed Processes" shall have the meaning set forth in Paragraph 1.4
of the TITAN License.

     1.5. "Licensed Products" shall have the meaning set forth in Paragraph 1.3
of the TITAN License.

     1.6. "Merger Agreement" shall mean that Agreement and Plan of
Reorganization dated July 16, 1997 by and between ANSAN and Discovery.

     1.7. "Net Sales" shall have the meaning set forth in Paragraph 1.6 of the
TITAN License.

     1.8. "New ANSAN License" shall mean the License Agreement to be entered
into by and between BAR-ILAN and ANSAN, as set forth in Exhibit A hereto.

     1.9. "Original ANSAN License" shall mean the License Agreement dated as of
October 31, 1992 by and between BAR-ILAN and ANSAN.

     1.10. "Patent Rights shall" have the meaning set forth in Paragraph 1.2 of
the TITAN License.


                                      -2-
<PAGE>

     1.11. "Securities" shall mean all outstanding securities in the capital
stock of ANSAN owned by or on behalf of TITAN, namely 1,212,654 shares of ANSAN
Common Stock.

     1.12. "TITAN License" shall mean the License Agreement to be entered into
by and between BAR-ILAN and TITAN, as set forth in Exhibit B hereto.

2. Royalty Payments

     In addition to the royalties payable to BAR-ILAN pursuant to the TITAN
License, TITAN shall pay to ANSAN either (i) until the expiration of the last
applicable patent within the Patent Rights on any Licensed Product or Licensed
Process in the country in which such Licensed Process is used or such Licensed
Product is made, used, leased, or sold, after which time TITAN's obligation to
pay royalties in that country shall cease, or (ii) until this Agreement is
terminated in accordance with its terms, in each calendar year an amount equal
to two percent (2%) of Net Sales of the Licensed Products or Licensed Processes
leased or sold by TITAN, any AFFILIATE or any sublicensee of TITAN.

3. Securities

     Subject to the terms and conditions of this Agreement, TITAN shall transfer
to ANSAN at the Closing (as defined in Article 5) all its right, title and
interest in the Securities, free and clear of any and all liens, encumbrances
and security interests. ANSAN and TITAN acknowledge that a portion of the
Securities are held by Continental Stock Transfer & Trust Company as Escrow
Agent pursuant to the terms of an Escrow Agreement dated as of May25, 1995.
ANSAN and TITAN agree to take all steps reasonably necessary to obtain release
of such Securities and delivery to ANSAN in accordance with the terms of this
Agreement. 

4. Repayment of Indebtedness

     Subject to the terms and conditions of this Agreement, ANSAN shall retire
all indebtedness then owing to TITAN, including the principal amount and
interest then owing on the debenture due April 1998 and any moneys owed for
administrative and financial services, less the sum of up to $100,000 for
expenditures made by ANSAN in connection with the Pivanex(TM)


                                      -3-
<PAGE>

product development program subsequent to June 30, 1997 (which shall be
contributed to ANSAN's capital), at the Closing (as defined in Article 5).

5. Closing

     The closing of the transactions contemplated by this Agreement (the
Closing) shall take place simultaneously with the closing of the Merger
Agreement at the offices of Heller Ehrman White & McAuliffe, 525 University
Avenue, Palo Alto, California or at such other time, date and location as the
parties agree.

6. Conditions to Closing

     6.1. Conditions to Obligations of TITAN. The obligations of TITAN to
consummate the transactions contemplated hereby shall be subject to satisfaction
at the Closing of each of the following conditions, any of which may be waived
by TITAN:

               (a) Representations and Warranties. The representations and
          warranties of ANSAN contained in this Agreement shall have been true
          and correct in all material respects as of the date of this Agreement
          and as of the date of the Closing. TITAN shall have received a
          certificate with respect to the foregoing signed on behalf of ANSAN by
          the Chief Executive Officer of ANSAN.

               (b) Closing of the Merger Agreement. The transactions
          contemplated by the Merger Agreement shall have closed.

               (c) License Agreements. BAR-ILAN and ANSAN shall have executed
          and delivered the New ANSAN License in substantially the form attached
          as Exhibit A hereto.

     6.2. Conditions to Obligations of ANSAN. The obligations of ANSAN to
consummate the transactions contemplated hereby shall be subject to satisfaction
at the Closing of each of the following conditions, any of which may be waived
by ANSAN:


                                      -4-
<PAGE>

               (a) Representations and Warranties. The representations and
          warranties of TITAN contained in this Agreement shall have been true
          and correct in all material respects as of the date of this Agreement
          and as of the date of the Closing. ANSAN shall have received a
          certificate with respect to the foregoing signed on behalf of TITAN by
          the Chief Executive officer of TITAN.
                           
               (b) Closing of the Merger Agreement. The transactions
          contemplated by the Merger Agreement shall have closed.

               (c) License Agreements. BAR-ILAN and TITAN shall have executed
          and delivered the TITAN License in substantially the form attached as
          Exhibit B hereto.

7. Representations and Warranties of TITAN.

     7.1. Authority. TITAN has all requisite corporate power and authority to
enter into this Agreement and to consummate the transactions contemplated
hereby. The execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of TITAN.

     7.2. Ownership of Securities. TITAN is the sole record and beneficial owner
of the Securities and owns all right, title and interest in such Securities free
and clear of all liens, encumbrances and security interests and at the Closing
shall transfer title to such Securities free and clear of all liens,
encumbrances and security interests. TITAN does not own beneficially or of
record or have the right to purchase any securities of ANSAN other than the
Securities.

8. Representations and Warranties of ANSAN.

     8.1. Authority. ANSAN has all requisite corporate power and authority to
enter into this Agreement and to consummate the transactions contemplated
hereby. The execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby have been duly authorized by all necessary
corporate action on the part of ANSAN, subject to approval of the stockholders
of ANSAN.


                                      -5-
<PAGE>

     8.2. Original ANSAN License. The Original ANSAN License is in full force
and effect, and to the knowledge of ANSAN, neither ANSAN nor BAR-ILAN is in
material breach of any term of the Original ANSAN License.

     8.3. Patents. Except as disclosed in any filings by ANSAN with the
Securities and Exchange Commission pursuant to the Securities Act of 1933 or the
Securities Exchange Act of 1934 prior to the date hereof, ANSAN has no knowledge
of any pending or threatened litigation claiming that any claim of the Patent
Rights infringes the rights of any other person, and to ANSAN's knowledge there
has been no infringement of the Patent Rights by any other person. During the
term of the Original ANSAN License, ANSAN has satisfied all of its obligations
to maintain the Patent Rights. 9. Transfer of Know-How; Further Cooperation.

     9.1. Transfer of Know-How. Within 30 days after the Closing, ANSAN shall
transfer to TITAN, free of charge, (a) copies of all pertinent documents
relating to the rights granted in the TITAN License, including all reports,
data, contracts and regulatory submissions and (b) all remaining Licensed
Product which has been formulated for non-topical use. ANSAN and TITAN shall
promptly after the Closing take all steps necessary to transfer the IND for AN-9
into TITAN's name and shall notify the FDA of such intention within 30 days
after the Closing. If necessary, the parties will cooperate in good faith to
establish an agreement for continuing support of the AN-9 product development
program. The parties will negotiate the specifics of such an agreement and the
reimbursement to be made to ANSAN for expenses incurred in connection therewith
on or before the Closing.

     9.2. Further Cooperation. The parties recognize that they may both be
developing the same compound(s) within the same patent rights (referred to as
the Basic Patents in the New ANSAN License and the Patent Rights in the TITAN
License), so that each may develop intellectual property, such as know-how
and/or further patent rights, of value to both parties. Accordingly, the parties
agree that they will cooperate in good faith to establish an agreement for the
disclosure by each party to the other of intellectual property relevant to the
others Field, and for the cooperative development and/or cross-licensing of such
intellectual property.


                                      -6-
<PAGE>

10. Miscellaneous.

     10.1. Notices. Any notice or other communication required or permitted
hereunder shall be in writing and shall be delivered personally or sent by
facsimile transmission, overnight courier, or certified, registered or express
mail, postage prepaid. Any such notice shall be deemed delivered when so
delivered personally or when sent by facsimile transmission (provided that an
appropriate indication of successful transmission is given by the sending
facsimile transmitter and a confirmation copy is sent by overnight courier), or
if sent by overnight courier, one day after deposit with an overnight courier,
or, if mailed, three days after the date of deposit in the United States mails
as follows:

         If to ANSAN:    Ansan Pharmaceuticals, Inc.
                         400 Oyster Point Boulevard, Suite 435
                         South San Francisco, California 94080
                         Attention: President
                         Telecopy No. (650) 635-0201

         If to TITAN:    Titan Pharmaceuticals, Inc.
                         400 Oyster Point Boulevard, Suite 505
                         South San Francisco, California 94080
                         Attention: President
                         Telecopy No. (650) 244-4956

     Either party may, by notice given in accordance with this Paragraph to the
other party, designate another address or person for receipt of notices
hereunder.
    
     10.2. Binding Effect; Amendment; Assignment. This Agreement shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns. Nothing in this Agreement is intended to
confer upon any person other than the parties hereto and their respective
successors and permitted assigns any rights or remedies whatsoever. This
Agreement may be amended only by an instrument in writing signed on behalf of
each of the parties. Neither party may sell, transfer or assign any of its
rights or obligations under this Agreement without the written consent of the
other party, which will not be unreasonably withheld.


                                      -7-
<PAGE>

     10.3. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of California applicable to agreements
made between California residents and to be performed entirely within
California.

     10.4. Expenses. All costs and expenses incurred in connection with the
transactions contemplated by this Agreement shall be paid by the party incurring
such expenses.

     10.5. Further Assurances. Each party will execute and deliver all such
further documents and instruments and take all such further actions as may be
necessary to consummate the transactions contemplated hereby.

     10.6. Disputes. Any and all disputes between the parties arising from or
relating to this Agreement shall be referred to the Chief Executive Officers of
ANSAN and TITAN, respectively, and they shall endeavor to resolve such dispute
in good faith for a period of 45 days. If any such dispute has not been resolved
within such 45-day period, either party may file an action in a court of
competent jurisdiction.

     10.7. Entire Agreement. This Agreement constitutes the entire agreement
between the parties with respect to the subject matter hereof and supersedes all
other prior and contemporaneous agreements, understandings, discussions and
correspondence between the parties with respect to the subject matter.

     IN WITNESS WHEREOF, the parties hereto have executed this License
Agreement, in duplicate, by proper persons thereunto duly authorized.

ANSAN                                           TITAN
By: /s/  V.H.J. SHALSON                         By:/s/ SUNIL BHONSLE
   ----------------------------                    -----------------------------
Name:  Vaughan Shalson                        Name:  Sunil Bhonsle
Title: President and CEO                      Title: Executive V.P. and COO
Date:  November 24, 1997                      Date:  11/24/97


                                      -8-



PORTIONS  OF  THIS  EXHIBIT  HAVE  BEEN  OMITTED   PURSUANT  TO  A  REQUEST  FOR
CONFIDENTIAL TREATMENT. THE OMITTED PORTIONS,  MARKED BY AN * AND [ ], HAVE BEEN
SEPARATELY FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

                              SUBLICENSE AGREEMENT

         THIS  SUBLICENSE  AGREEMENT, effective  as of the 20th day of November,
1997,  between TITAN  PHARMACEUTICALS,  INC., a corporation  organized under the
laws of the State of  Delaware  and  having its  principal  office at 400 Oyster
Point Blvd., Suite 505, South San Francisco, CA 94080 (hereinafter "TITAN"), and
NOVARTIS PHARMA A.G., a corporation  organized under the laws of Switzerland and
having its  principal  office at  Lichtstrasse  35, CH 4002  Basel,  Switzerland
(hereinafter "NOVARTIS").

                                WITNESSETH THAT:

         WHEREAS,  TITAN is the exclusive  worldwide  licensee of HOECHST MARION
ROUSSEL, INC. ("HMRI"),  under a License Agreement between TITAN and HMRI having
an Effective Date of December 31, 1996 (the "License Agreement"); and

         WHEREAS, under such License Agreement, TITAN has rights with respect to
certain patents and patent  applications,  identified in Appendix A hereto,  and
know-how relating to a compound known as Iloperidone; and

         WHEREAS,  NOVARTIS desires to obtain certain exclusive sublicenses from
TITAN under the aforesaid  License  Agreement,  and TITAN is willing to grant to
NOVARTIS such sublicenses;

         NOW,  THEREFORE,  in  consideration  of the covenants  and  obligations
expressed  herein,  and  intending  to be legally  bound,  the parties  agree as
follows:

         1. DEFINITIONS.

                  1.1 "HMRI" shall mean HOECHST MARION ROUSSEL, INC.

<PAGE>

                                                                    CONFIDENTIAL

                  1.2 "TITAN" shall mean TITAN PHARMACEUTICALS, INC.

                  1.3 "NOVARTIS" shall mean NOVARTIS PHARMA A.G.

                  1.4 "AFFILIATE" shall mean any corporation,  firm, partnership
or other entity, whether de jure or de facto, which directly or indirectly owns,
is  owned  by or is  under  common  ownership  with a party  to this  Sublicense
Agreement, or HMRI, to the extent of more than fifty percent (50%) of the equity
(or such lesser percentage which is the maximum allowed to be owned by a foreign
corporation in a particular jurisdiction) having the power to direct the affairs
of the entity and any person,  firm,  partnership,  corporation  or other entity
actually controlled by, controlling or under common control with a party to this
Sublicense Agreement or HMRI.

                  1.5 "COMPETITIVE  INDUSTRY  STANDARD LEVEL" shall mean PRODUCT
shall be marketed by or on behalf of NOVARTIS, its AFFILIATES or SUBLICENSEES in
the  countries of the  TERRITORY  where  PATENTS are issued and enforced with at
least the same  diligence  that NOVARTIS would use in marketing its own products
in such  countries,  in a manner  consistent  with  the  effort  devoted  by the
pharmaceutical  industry to products having the same or similar  potential value
of PRODUCT in those countries when PRODUCT is launched.

                  1.6  "COMPOUND"  shall  mean the  chemical  compound  known as
Iloperidone,       whose      more      specific      chemical      name      is
1-[4-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-
piperidinyl]propoxy]-3-methoxyphenyl]ethanone,  including  any salts,  hydrates,
solvates,  and/or  stereoisomers  thereof,  and only the  metabolites  listed in
Appendix B hereto, including any salts, hydrates,  solvates and/or stereoisomers
of such metabolites.


                                      -2-
<PAGE>

                                                                    CONFIDENTIAL

                  1.7  "EEA"  shall  mean  the  European  Economic  Area,  which
consists of the EUROPEAN UNION and Iceland, Lichtenstein and Norway.

                  1.8  "EUROPEAN  UNION"  shall  mean the  member  states of the
European  Union,  as may exist  from time to time,  which as of the date  hereof
include Austria,  Belgium,  Denmark,  Finland, France, Germany, Greece, Ireland,
Italy,  Luxembourg,  the  Netherlands,  Portugal,  Spain,  Sweden and the United
Kingdom.

                  1.9  "EXCLUSIVE"  shall have the meaning  specified in Section
2.1 hereof.

                  1.10  "FDA"  shall  mean  the  United  States  Food  and  Drug
Administration.

                  1.11 "FD&C ACT" shall mean the Federal Food, Drug and Cosmetic
Act (21 U.S.C. 301ff), as amended from time to time.

                  1.12 "FIELD" shall mean the treatment in humans of psychiatric
disorders, including psychotic disorders, and analgesia.

                  1.13 "IND" shall mean an Investigational New Drug Application.

                  1.14  "KNOW-HOW"  shall  mean all  technical  information  and
know-how:  (a)  presently  developed  and  owned or  controlled  by HMRI and its
AFFILIATES,  (b) developed  and owned or controlled by TITAN and its  AFFILIATES
after  the  date of the  License  Agreement,  and (c)  developed  and  owned  or
controlled by HMRI and its AFFILIATES,  or TITAN and its  AFFILIATES,  after the
date hereof and included  within this  definition  of "KNOW-HOW" by operation of
Section 2.3 hereof,  which relates to COMPOUND or PRODUCT in the FIELD and which
constitutes a proprietary  "trade secret" or other valid  intellectual  property
right  under  U.S.  or other  applicable  law which is  substantial,  secret and
identifiable, including, without limitation,


                                      -3-
<PAGE>

                                                                    CONFIDENTIAL

all biological, chemical, pharmacological,  toxicological, clinical, regulatory,
analytical,  quality control and  manufacturing  data and any other  information
(whether  technical or  commercial)  relating to COMPOUND or PRODUCT that may be
useful   for   the   development,    regulatory   approval,    manufacture   and
commercialization of COMPOUND or PRODUCT.

                  1.15  "NDA"  shall  mean any and all  applications  (New  Drug
Applications)  submitted to the FDA under  Sections  505, 507 or 512 of the FD&C
ACT and applicable regulations related to PRODUCT, including without limitation,
full NDAs,  "paper" NDAs and  abbreviated  NDAs (ANDAs) and all  amendments  and
supplements thereto or equivalent applications in the EUROPEAN UNION.

                  1.16 "NET SALES"  shall be  calculated  as  follows:  From the
gross  invoice  price  of  PRODUCT  sold  by  NOVARTIS  or  its   AFFILIATES  or
SUBLICENSEES   to   independent,   THIRD  PARTIES  in  bona  fide,   arms-length
transactions there shall be subtracted, if not previously deducted in the amount
invoiced or received, (i) quantity and cash discounts actually allowed or taken,
(ii)  freight,  postage and  shipping  insurance  allocated in  accordance  with
NOVARTIS' standard allocation procedure, (iii) customs duties and taxes, if any,
directly  related to the sale,  (iv)  amounts  repaid or  credited  by reason of
rejections,  return of goods and  retroactive  price  reductions  mandated by or
granted in  response  to state,  provincial  or federal  law or  regulation  and
specifically  identifiable  as relating to  PRODUCT,  (v) amounts  incurred as a
result of governmental (or governmental  agency) mandated rebate programs,  (vi)
third party rebates and wholesaler chargebacks related to the sale of PRODUCT to
the extent actually  allowed and (vii) as agreed by the parties in writing,  any
other specifically identifiable amounts included in PRODUCT's gross


                                      -4-
<PAGE>

                                                                    CONFIDENTIAL

sales  that  were or  ultimately  will be  credited  and that are  substantially
similar to those listed hereinabove.

                  The  computation  of NET SALES shall not include sales between
or  among  a  party  and its  AFFILIATES  or  SUBLICENSEES,  except  where  such
AFFILIATES  or  SUBLICENSEES  are end users.  For  purposes  of this  Sublicense
Agreement,  sales of PRODUCT to independent  distributors,  wholesalers or other
parties who  purchase  and take title to PRODUCT are  considered  to be sales to
THIRD  PARTIES.  If PRODUCT  is sold  through  intermediaries  such as agents or
co-promoters  who do not purchase and take title to PRODUCT,  royalties shall be
due  on  NET  SALES  to  THIRD  PARTIES  who  purchase   PRODUCT   through  such
intermediaries.  It is agreed  that there shall be no sales of COMPOUND to THIRD
PARTIES by or on behalf of NOVARTIS,  its  AFFILIATES  or  SUBLICENSEES.  In the
event there are sales of COMPOUND to THIRD  PARTIES by or on behalf of NOVARTIS,
its  AFFILIATES or  SUBLICENSEES,  such sales shall be subject to the payment of
royalties  by  NOVARTIS to TITAN or HMRI (as the case may be) to the same extent
as payments of royalties are due on sales of PRODUCT pursuant to this Agreement.

                  1.17 "PATENTS" shall mean all patents and patent  applications
set  forth  in  Appendix  A,  including  continuations,   continuations-in-part,
divisions,   patents  of  addition,  reissues,   re-examinations,   renewals  or
extensions thereof, along with supplementary  protection  certificates and other
administrative  protection of any kind in the  TERRITORY  owned or controlled by
HMRI or its  AFFILIATES  to the extent they claim  COMPOUND or PRODUCT,  or use,
formulations  or manufacture  thereof,  for use in the FIELD,  but not any other
compound or use outside of the FIELD


                                      -5-
<PAGE>

                                                                    CONFIDENTIAL

disclosed  or  claimed  in those  patents  or patent  applications.  Any  patent
relating to COMPOUND or PRODUCT for use in the FIELD which is issued  during the
term  of  this  Sublicense  Agreement  in any  country  of the  TERRITORY  shall
automatically  be  deemed  as of the date of such  issuance  to be  included  in
PATENT, as defined hereunder.

                  1.18 "PRODUCT" shall mean any bulk or finished  pharmaceutical
composition  containing COMPOUND as the sole pharmaceutically  active ingredient
for use in the FIELD.

                  1.19  "SEC"  shall  mean  the  United  States  Securities  and
Exchange Commission.

                  1.20 "SUBLICENSEE" shall mean a THIRD PARTY (as defined below)
to whom a party sublicenses rights to manufacture and sell (or have manufactured
and sold)  COMPOUND  under  PATENTS,  but shall not include any THIRD PARTIES to
whom rights to  manufacture  COMPOUND have not been  granted.  Unless such party
grants to such THIRD  PARTY the right to  manufacture  COMPOUND,  the  following
THIRD  PARTIES  shall  not  be  considered   SUBLICENSEES   hereunder:   agents,
distributors, wholesalers, subcontractors,  co-marketers, co-promoters, partners
or joint  venturers.  SUBLICENSEES  shall not include  compulsory  licensees  as
described in Section 4.1(a).

                  1.21  "TERRITORY"  shall mean all countries and territories of
the world except Japan;  provided that any country(ies) in which this Sublicense
Agreement is terminated shall be removed from the scope of this definition.

                  1.22 "THIRD  PARTY" shall mean any party other than a party to
this Sublicense Agreement or an AFFILIATE thereof.

         2. GRANT.


                                      -6-
<PAGE>

                                                                    CONFIDENTIAL

                  2.1 TITAN hereby grants to NOVARTIS an EXCLUSIVE sublicense in
the FIELD under the PATENTS  (to the extent,  but only to the extent,  that such
patents or patent  applications  claim  COMPOUND or PRODUCT or the  manufacture,
formulation, or use thereof) and KNOW-HOW to develop, have developed, make, have
made, use,  import,  sell,  offer for sale and have sold COMPOUND and PRODUCT in
the TERRITORY, subject to the terms and conditions of this Sublicense Agreement.
The foregoing  sublicense  shall include the right to sublicense,  but only upon
HMRI's  and  TITAN's  prior  written   consent,   which  consent  shall  not  be
unreasonably  withheld.  Any such sublicense(s) shall impose upon SUBLICENSEE(S)
substantially  the  same  terms  and  conditions  as  NOVARTIS  assumes  in this
Sublicense Agreement,  except no such sublicense(s) shall be required to contain
obligations  on the part of the  SUBLICENSEE  regarding  payment  of an  upfront
license fee, milestone payments or the same or similar royalty rates. As used in
this  Sublicense  Agreement,  the term  "EXCLUSIVE"  shall mean neither HMRI nor
TITAN or any of their  respective  AFFILIATES  shall grant any other license to,
nor  themselves  exploit,  the PATENTS and KNOW-HOW with respect to COMPOUND and
PRODUCT  in the FIELD  (unless  otherwise  specified  herein)  and be limited as
follows:

                           (a)  With  respect  to all  geographic  areas  in the
TERRITORY  outside  of the  EEA,  such  sublicense  shall be  exclusive  for the
duration and  validity of the  intellectual  property  rights  constituting  the
PATENTS and/or KNOW-HOW.

                           (b)  With  respect  to all  geographic  areas  in the
TERRITORY  within the EEA, such sublicense  shall be exclusive for the following
time periods:


                                      -7-
<PAGE>

                                                                    CONFIDENTIAL

                                    (i) For each of the countries within the EEA
where only  PATENTS (and not  KNOW-HOW)  exist and are  sublicensed  to NOVARTIS
hereunder,  the period of exclusivity  for each such country shall be limited to
the duration of the relevant  PATENTS in such country,  provided that  "PATENTS"
for purposes of the interpretation of this paragraph shall be limited to patents
existing,  and patents issuing from patent  applications  existing,  and patents
issuing from patent applications  covering inventions existing as of the date of
the License Agreement;

                                    (ii) For each of the  countries  within  the
EEA where PATENTS and KNOW-HOW exist and are sublicensed to NOVARTIS  hereunder,
the period of exclusivity for each such country shall be limited to the duration
of the relevant PATENTS in such country, provided that "PATENTS" for purposes of
the  interpretation of this paragraph shall be limited to patents existing,  and
patents issuing from patent applications existing, as of the date of the License
Agreement and, provided,  further,  that if the duration of such PATENTS is less
than ten (10) years from the date of first  marketing  of PRODUCT in the EEA but
the KNOW-HOW continues to be sublicensed hereunder,  the duration of exclusivity
shall be for ten (10) years from the date of first  marketing  of PRODUCT in the
EEA; and

                                    (iii) For each of the  countries  within the
EEA where  KNOW-HOW  (and not  PATENTS)  exists and is  sublicensed  to NOVARTIS
hereunder,  the period of exclusivity  for each such country shall be limited to
ten (10) years from the date of first marketing of PRODUCT in the EEA;

         Thereafter,  such sublicense  within the EEA shall be on a nonexclusive
basis.


                                      -8-
<PAGE>

                                                                    CONFIDENTIAL

                           (c)  Notwithstanding the provisions of clause 2.1(b),
above,  in the event that the TERRITORY  (for whatever  reason) does not include
all countries  within the EEA, this  Sublicense  Agreement shall be deemed to be
amended  in a  reciprocal  fashion to comply  with  applicable  competition  law
requirements, while preserving the EXCLUSIVE rights of the parties hereto to the
extent possible.

                           (d) For  all  purposes,  such  exclusivity  shall  be
subject to Section 2.3 hereof.

                           (e)  HMRI  and  its  AFFILIATES  and  licensed  THIRD
PARTIES  shall be entitled  to utilize  the  PATENTS  and  KNOW-HOW in the FIELD
within the TERRITORY for the development and manufacture of COMPOUND and PRODUCT
for  marketing,  distribution  and sale outside of the TERRITORY  (where TITAN's
rights under the License Agreement have been terminated).

                           (f) TITAN and its AFFILIATES and  SUBLICENSEES  shall
also be entitled to utilize  the  PATENTS and  KNOW-HOW in the FIELD  within the
TERRITORY  for the  development  and  manufacture  of  COMPOUND  and PRODUCT for
marketing,  distribution  and sale outside of the  TERRITORY (in Japan and where
NOVARTIS' rights under this Sublicense Agreement have been terminated).

         The  duration of the  sublicense  granted by this  Section 2.1 shall be
limited to the duration,  on a  country-by-country  basis,  of the  intellectual
property  rights  which  comprise  the PATENTS and  KNOW-HOW  with  respect to a
relevant country, provided that the termination of any portion of any


                                      -9-
<PAGE>

                                                                    CONFIDENTIAL

sublicense  shall be without  prejudice  to the  requirement  of NOVARTIS to pay
royalties pursuant to the terms of this Sublicense Agreement.

         Notwithstanding  the  foregoing  but  subject to  Sections  3.4 and 3.5
hereof,  TITAN  acknowledges  and agrees that NOVARTIS  shall as a matter of law
have the right to  continue  to use on a  royalty-free,  nonexclusive  basis the
information which  constitutes the PATENTS and KNOW-HOW on a  country-by-country
basis in the  TERRITORY  for the FIELD after the  PATENTS  expire or cease to be
valid or enforceable and/or KNOW-HOW has entered into the public domain.

                  2.2  Subject to  NOVARTIS'  right of first  negotiation  under
Section 5.6 hereof and TITAN's right of first  negotiation  under Section 5.6 of
the License  Agreement,  with respect to uses or indications  outside the FIELD,
HMRI shall have the right for either HMRI,  its  AFFILIATES or  SUBLICENSEES  to
develop, have developed,  make, have made, use, import, sell, offer for sale and
have sold COMPOUND and PRODUCT for uses outside the FIELD.

                  2.3  Subject to  Sections  2.3(a) and 2.3(b)  below,  HMRI and
TITAN also shall have the right to make and use  COMPOUND or PRODUCT for the use
in the FIELD limited solely to further study,  investigation or  experimentation
purposes to further  understand the category of compounds in the FIELD, how they
work and their  comparison to other compounds.  The reservations  stated in this
provision  shall be  understood by the parties to comprise  independent  work by
HMRI, TITAN and their respective AFFILIATES,  SUBLICENSEES or collaborators (who
are subject to obligations of nonuse and nondisclosure with respect thereto).

                           (a) In the  event  that  the  results  of  such  work
described in the immediately  preceding  paragraph would be relevant to COMPOUND
or PRODUCTS with respect to the FIELD


                                      -10-
<PAGE>

                                                                    CONFIDENTIAL

and could  appropriately  be included  within the PATENTS and KNOW-HOW  licensed
hereunder,  and if HMRI or TITAN (as the case may be) has the legal  right to do
so, all as determined in the reasonable discretion of HMRI or TITAN (as the case
may be), then if such work was conducted by HMRI, its  AFFILIATES,  SUBLICENSEES
or  collaborators,  HMRI shall offer such results to TITAN and, if such work was
conducted by TITAN, its AFFILIATES,  SUBLICENSEES or collaborators,  TITAN shall
offer such  results to  NOVARTIS.  If such results are offered to TITAN by HMRI,
TITAN shall make such results available to NOVARTIS.

                           (b) If NOVARTIS  notifies  TITAN,  within  forty-five
(45) days after  receiving  such  results  (whether  offered by HMRI to TITAN or
resulting  from  work  conducted  by  TITAN,  its  AFFILIATES,  SUBLICENSEES  or
collaborators),  that  NOVARTIS  wishes such  results to be included  within the
PATENTS and KNOW-HOW sublicensed hereunder, then with respect to results offered
by HMRI to TITAN,  TITAN shall accept such results in writing,  and such results
shall be included,  as appropriate,  within the PATENTS and KNOW-HOW sublicensed
hereunder.  If such  results are  declined by  NOVARTIS,  and are not  otherwise
accepted by TITAN if such results  were  offered to TITAN by HMRI,  such results
may be used,  assigned or licensed by HMRI or TITAN, as the case may be, subject
to provisions of the License Agreement.

                           (c) It is mutually  understood  by the  parties  that
independent  experimental  use of COMPOUND or PRODUCT or of results as described
in this  Section  2.3 shall  not be used in any way that  could be  damaging  or
otherwise  detrimental to COMPOUND or PRODUCT or their development,  manufacture
or commercialization by TITAN,  NOVARTIS or HMRI or their respective  AFFILIATES
or SUBLICENSEES. Within twenty (20) days of HMRI's or TITAN's


                                      -11-
<PAGE>

                                                                    CONFIDENTIAL

request,  NOVARTIS  shall provide to HMRI or TITAN,  as the case may be, free of
charge reasonable quantities of COMPOUND or PRODUCT for such experimental use in
laboratory  or animal  studies.  This does not prevent HMRI or TITAN from making
COMPOUND or PRODUCT for experimental use only in laboratory or animal studies.

                  2.4  TITAN  grants  to  NOVARTIS  a  nonexclusive,   worldwide
sublicense to make or use any analytical  reference  standards,  intermediate or
metabolite  of COMPOUND or PRODUCT not listed in Appendix B hereto  which may be
claimed in PATENTS  limited  solely to making or using the  COMPOUND or PRODUCT.
The foregoing  sublicense  shall include the right to sublicense,  but only upon
HMRI's prior written consent,  which consent shall not be unreasonably withheld.
Any such  sublicense  shall impose upon  SUBLICENSEE(S)  substantially  the same
terms and conditions as NOVARTIS assumes in this Sublicense Agreement, except no
such sublicense(s)  shall be required to contain  obligations on the part of the
SUBLICENSEE  regarding payment of an upfront license fee,  milestone payments or
the same or similar royalty rates.

                  2.5 NOVARTIS  shall  promote,  market and sell PRODUCT under a
registered NOVARTIS  trademark(s)  approved by HMRI, which approval shall not be
unreasonably  withheld.  NOVARTIS  shall be  responsible  for the  selection and
registration  of such  trademark(s) in all countries of the TERRITORY at its own
cost.  In  the  event  the  sublicense  granted  hereunder  is  terminated  in a
particular  country,  other  than  pursuant  to  Section  10.3 or as a result of
NOVARTIS'  termination  of this  Sublicense  Agreement  for breach  pursuant  to
Section 10.5, and HMRI or its designee(s) exercises the right to promote, market
or sell  PRODUCT in such country  then upon HMRI's  request (a)  NOVARTIS  shall
grant HMRI or its designee(s) a trademark license at a royalty


                                      -12-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

to be  negotiated  in good  faith  (which  royalty  shall not be less than [ * ]
and no more than [ * ] on net sales of PRODUCT by HMRI and/or its  designees) at
such time to use such  trademark in connection  with  marketing  PRODUCT in such
country,  subject to reasonable  quality control by NOVARTIS with respect to the
PRODUCT sold under this Section  2.5(a),  or (b) HMRI or its  designee(s)  shall
select and register at HMRI's cost a trademark of its own in connection with the
marketing of PRODUCT in such country, provided such HMRI trademark is not in any
way confusingly similar to NOVARTIS' trademark. HMRI shall use an HMRI trademark
(rather than a NOVARTIS trademark) in promoting, marketing or selling PRODUCT in
any country  that is a member of a free trade union or other  economic  grouping
(e.g.,  the EUROPEAN UNION,  EEA, NAFTA,  ASEAN and ANDEAN PACT countries) where
NOVARTIS is promoting, marketing or selling PRODUCT under a NOVARTIS trademark.

                  2.6 If  NOVARTIS  notifies  TITAN  in  writing  that  NOVARTIS
(and/or its  AFFILIATE(S)) is not willing or does not have the capability itself
or cannot enter into a Sublicense or other  agreement  (providing  the necessary
expertise and resources) in country(ies)  outside those covered by NAFTA and the
EUROPEAN  UNION to: (a) develop  COMPOUND or PRODUCT (as the case may  warrant),
and (b) manufacture  COMPOUND and/or market PRODUCT (as the case may warrant) at
a COMPETITIVE  INDUSTRY  STANDARD LEVEL at the date of PRODUCT  approval in such
country(ies),  then  TITAN  shall  have the right to  terminate  the  sublicense
granted by this Sublicense Agreement but only with respect to such country(ies),
unless the parties agree in writing to extend such time frame.


                                      -13-
<PAGE>

                                                                    CONFIDENTIAL

                  2.7 If PRODUCT is not  launched in each of the United  States,
France and Germany,  respectively,  at a COMPETITIVE  INDUSTRY STANDARD LEVEL by
NOVARTIS,  its AFFILIATE and/or SUBLICENSEE within six (6) months after the date
of receiving the  approvals  necessary to  commercialize  PRODUCT in each of the
United States, Germany and France, respectively,  NOVARTIS, TITAN and HMRI shall
review the progress of launch efforts,  it being understood the parties,  at the
request of either party,  may review the progress of launch efforts prior to the
end of such six (6) month  period.  NOVARTIS  shall  keep  TITAN  informed  on a
regular basis of the status of its launch efforts after  receiving the approvals
necessary to  commercialize  PRODUCT in each of the United  States,  Germany and
France,  respectively,  until such time that  launch is  achieved  in the United
States,  Germany or France.  If launch in each of the United  States,  France or
Germany,  respectively,  is not  achieved  within one (1) year after the date of
receiving the approvals necessary to commercialize  PRODUCT in such country(ies)
(circumstances  shall not include  events of force majeure as defined in Section
13),  or in any event  within  two (2) years  after  PRODUCT  approval  then the
sublicense granted by this Sublicense  Agreement shall terminate,  but only with
respect to the particular  country where launch was not achieved within such one
(1) year or two (2) year time  frame,  as the case may be,  unless  the  parties
agree in writing to extend such time frame (e.g., the parties shall discuss,  in
such  event,  factors  including  but not  limited  to the  necessity  to obtain
approval of PRODUCT for its target indication(s)).

                  2.8 If an NDA or equivalent ex-U.S. regulatory approval in the
EUROPEAN  UNION  (Marketing   Authorization   Application  via  the  Centralized
Procedure or marketing approvals


                                      -14-
<PAGE>

                                                                    CONFIDENTIAL

for the  member  countries  of the  EUROPEAN  UNION via the  mutual  recognition
procedure)  for PRODUCT is not  obtained  within three (3) years of NOVARTIS' or
its  AFFILIATE's  or  SUBLICENSEE's  filing of an NDA or such  other  equivalent
ex-U.S. filing, and such failure is solely due to circumstances within NOVARTIS'
reasonable  control,  then the parties  shall  discuss the reasons and  proposed
remedies for such failure in good faith; provided,  however, that if the parties
are  unable  to  agree on any  such  remedies,  TITAN  shall  have the  right to
terminate the sublicense  granted by this  Sublicense  Agreement,  but only with
respect to the United  States or the EUROPEAN  UNION where such approval was not
obtained,  unless the parties  agree in writing to extend  such time frame.  If,
however,  NOVARTIS,  TITAN  and  HMRI  determine  that  such  failure  is due to
circumstances  beyond the  reasonable  control of  NOVARTIS  (including  without
limitation  delays on the part of the regulatory  agencies),  the three (3) year
period shall be extended to take into account such  circumstances,  the duration
of any such extension to be mutually agreed.

                  2.9 Subject to the provisions of Section  2.9(d),  TITAN shall
not be obligated to refund any upfront license fees and milestone  payments paid
to TITAN with respect to any country(ies)  which cease to be included within the
TERRITORY,   and  in  the  event  that  (i)  TITAN,  HMRI  or  their  respective
AFFILIATE(S) or  SUBLICENSEE(S)  elects to commercialize  PRODUCT or COMPOUND in
such country(ies) and (ii) NOVARTIS,  its AFFILIATE(S) or SUBLICENSEE(S)  has an
NDA filing in the United States or an equivalent  filing in the EUROPEAN  UNION,
then in consideration for use of any IND, NDA or other governmental  approval or
associated  developmental  work held or owned by NOVARTIS related to COMPOUND or
PRODUCT:


                                      -15-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

                           (a) At TITAN's  request,  and subject to Sections 6.3
and 11.5 hereof,  NOVARTIS  shall  license or  otherwise  make  available  under
applicable law the benefit of such approvals or work to TITAN or an AFFILIATE or
THIRD PARTY  designated  by TITAN (which  third party could be HMRI),  who shall
thereafter have the rights to develop,  register,  manufacture,  market and sell
COMPOUND and PRODUCT in such country(ies)  utilizing such approvals or work, and
TITAN (or such  AFFILIATE  or THIRD PARTY) shall pay to NOVARTIS a royalty to be
negotiated in good faith at the time TITAN  exercises such option,  on net sales
of PRODUCT by TITAN or its designees in such country to equitably  recognize the
value  added by  NOVARTIS to COMPOUND  and/or  PRODUCT  through its  development
efforts. Such royalty shall not be greater than [ * ] on net sales of PRODUCT by
TITAN or its  designees.  Upon  expiration of PATENT in such  country,  only the
royalty paid to NOVARTIS for HMRI's and/or TITAN's use of the NOVARTIS trademark
under  Section 2.5 shall be paid to NOVARTIS  for so long as such  trademark  is
utilized.  If a trademark  license has not been granted to HMRI or TITAN in such
country, no royalty shall be paid to NOVARTIS upon expiration of PATENT.

                           (b) TITAN  shall  share  equally  with  NOVARTIS  any
upfront  license  fees,  milestone  payments or other  payments  such as prepaid
royalties  received from a THIRD PARTY in  connection  with the exercise of such
option only.  If NOVARTIS has not paid to TITAN the upfront  license fee and all
of the  milestone  payments  provided for in Sections  3.1(a)  through (c), then
NOVARTIS'  share of the amount shall be multiplied by a fraction,  the numerator
of which is equal to the total of the  payments  that have been made by NOVARTIS
to TITAN under  Sections  3.1(a)  through (c), and the  denominator  of which is
equal to the total of the payments that


                                      -16-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

NOVARTIS  otherwise  would have been  required  to pay to TITAN  under  Sections
3.1(a) through (c) had the sublicense not been terminated.

                           (c) Notwithstanding  anything contained herein to the
contrary,  TITAN  shall not be required to pay to NOVARTIS a royalty on sales of
PRODUCT  that,  when  added to the  royalty  payments  for a  license  under the
NOVARTIS  trademark  that HMRI  and/or  TITAN may be required to pay to NOVARTIS
under Section 2.5, exceeds in the aggregate [ * ].

                           (d)  If   the   circumstances   leading   up  to  the
termination of the Sublicense  Agreement  pursuant to Section 2.8 are due to any
misrepresentations, omissions (of information owned or controlled by HMRI or its
AFFILIATES or TITAN or its  AFFILIATES as of the date hereof) or  falsifications
with  respect  to such  KNOW-HOW,  information  or data or  fraud by HMRI or its
AFFILIATES or TITAN or its AFFILIATES,  then subject to the following  sentence,
TITAN shall repay to NOVARTIS, within ninety-five (95) days of such termination,
that  portion  of the  upfront  license  fee and  milestone  payments  TITAN had
received from NOVARTIS up to the date of such termination (including in the form
of NOVARTIS'  purchase of TITAN  convertible  preferred  stock).  In the case of
misrepresentations, omissions (of information owned or controlled by HMRI or its
AFFILIATES  as of the  date  hereof)  or  falsifications  with  respect  to such
KNOW-HOW,  information  or data or fraud only by HMRI or its  AFFILIATES,  and a
termination  of the  License  Agreement  pursuant  to Section 2.5 of the License
Agreement, TITAN shall be obligated to make the foregoing repayments to NOVARTIS
if, and only if, HMRI has repaid the upfront license fee and milestone  payments
to TITAN under Section 2.6(d) of the License Agreement.


                                      -17-
<PAGE>

                                                                    CONFIDENTIAL

                  2.10 In the event NOVARTIS or a SUBLICENSEE  intends to seek a
co-promotion or co-marketing partner for PRODUCT in the United States,  NOVARTIS
shall notify TITAN thereof in writing. TITAN shall then notify HMRI thereof, and
HMRI shall have a right of first negotiation with NOVARTIS or the SUBLICENSEE on
such a  collaboration.  If HMRI exercises its right of first  negotiation,  then
HMRI and NOVARTIS or the SUBLICENSEE  shall negotiate in good faith for a period
of  ninety  (90)  days from the date of  notification  by TITAN to HMRI.  If the
negotiating  parties  are  unable to enter into a  separate  definitive  written
agreement  regarding  such  collaboration  by the end of such  ninety  (90)  day
period,  NOVARTIS or the SUBLICENSEE shall be free to enter into a collaboration
with any THIRD PARTY subject to all other terms of this Sublicense Agreement and
shall have no further  obligation to negotiate  with HMRI.  For purposes of this
Section 2.10, the term  "co-promotion or co-marketing  partner" will not include
an  independent  contract field sales force that may be engaged by NOVARTIS or a
SUBLICENSEE.

         3. PAYMENTS AND ROYALTIES.

                  3.1 As consideration  for the sublicenses  granted to NOVARTIS
by TITAN under this  Sublicense  Agreement,  NOVARTIS  shall make the  following
payments to TITAN:

                           (a) An upfront  license fee of Twenty Million Dollars
(U.S.  $20,000,000)  shall be paid by  NOVARTIS to TITAN in cash within ten (10)
business days of both parties'  execution of this  Sublicense  Agreement.  TITAN
acknowledges  that,  as of the  effective  date  of this  Sublicense  Agreement,
NOVARTIS has already paid to TITAN Five Million  Dollars  (U.S.  $5,000,000)  of
such Twenty  Million Dollar (U.S.  $20,000,0000)  amount;  therefore,  as of the
effective  date of this  Sublicense  Agreement,  NOVARTIS is obligated to pay to
TITAN the


                                      -18-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

remaining  Fifteen  Million  Dollars (U.S.  $15,000,000)  of such Twenty Million
Dollar (U.S.  $20,000,000) upfront license fee. Up to Five Million Dollars (U.S.
$5,000,000) of such Twenty Million  Dollar amount may, at NOVARTIS'  option,  be
paid in the form of an equity  investment made by NOVARTIS in TITAN  convertible
preferred  stock  at a  price  per  share  as  provided  for in the  Convertible
Preferred Stock  Agreement  between TITAN and NOVARTIS of even date herewith and
attached hereto as Appendix C and  incorporated  herein by reference.  NOTE: the
immediately preceding sentence will be deleted from this Sublicense Agreement if
the parties do not enter into the Convertible Preferred Stock Agreement referred
to above  simultaneously  with the execution of this Sublicense  Agreement.  The
Twenty  Million  Dollar  payment  provided for herein  shall,  unless  otherwise
expressly provided for herein, be non-refundable.

                           (b) A first  development  milestone  payment of [ * ]
shall be payable by NOVARTIS to TITAN upon submission by TITAN to NOVARTIS of an
invoice therefor substantially in the form of the sample invoice attached hereto
as Appendix D (the "Invoice"), one time only upon the first NDA Filing (based on
a full and complete  regulatory package and for these purposes not to include an
ANDA or "Paper"  NDA) for  PRODUCT in the FIELD in the United  States  (New Drug
Application)   or  the  Initial  Filing  in  Europe   (Marketing   Authorization
Application via the Central Procedure,  or the mutual recognition  procedure) by
NOVARTIS, its AFFILIATE or SUBLICENSEE. As used in this Section, "NDA Filing" or
"Initial  Filing in Europe" (as the case may be) shall mean the  notification in
writing to NOVARTIS,  its AFFILIATE or SUBLICENSEE from the FDA or an equivalent
EUROPEAN UNION regulatory authority (via the Centralized Procedure or the mutual
recognition procedure) that the NDA or Initial


                                      -19-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

Filing  in  Europe  (as the case may be) is  sufficiently  complete  to permit a
substantive  review.  Such  milestone  payment shall be paid in cash by NOVARTIS
directly  to HMRI  within  seven  (7)  business  days of the date of such  first
filing,  and NOVARTIS shall notify TITAN of such payment  concurrently with such
payment to HMRI. The [ * ] payment  provided for herein shall,  unless otherwise
expressly provided for herein, be non-refundable.

                           (c)  Following  prior  receipt by NOVARTIS of TITAN's
Invoice therefor, a second development milestone payment of [ * ] which shall be
payable one time only by NOVARTIS to HMRI as follows: (i) [ * ] shall be paid in
cash by NOVARTIS  directly to HMRI, within seven (7) business days of receipt by
NOVARTIS,  its  AFFILIATE  or  SUBLICENSEE  of the FDA  approval  letter  or the
regulatory  agency  for the  EUROPEAN  UNION  (Marketing  Authorization  via the
Centralized Procedure or mutual recognition procedure), that PRODUCT is approved
for marketing and  commercialization  by NOVARTIS , its AFFILIATE or SUBLICENSEE
(or their designee) for a major indication having an approval  comparable to the
principal indication(s) of leading competing products in the FIELD, and NOVARTIS
shall notify TITAN of such payment  concurrently  with such payment to HMRI; and
(ii) [ * ] shall be paid in cash by  NOVARTIS  directly  to HMRI  within six (6)
months after receipt of such  notification,  and NOVARTIS  shall notify TITAN of
such payment  concurrently with such payment to HMRI. The [ * ] payment provided
for  herein  shall,   unless  otherwise   expressly   provided  for  herein,  be
non-refundable.


                                      -20-
<PAGE>

                                                                    CONFIDENTIAL

                           (d) NOVARTIS  shall  notify  TITAN in writing  thirty
(30) business days prior to NOVARTIS'  estimated  achievement  of each milestone
event described in Sections 3.1(b) and 3.1(c)(i) above. Upon the receipt of such
notification, TITAN shall send NOVARTIS an Invoice for the milestone payment due
as a result of the achievement of such milestone  event, and NOVARTIS shall make
each such  payment  within  seven (7) business  days of the  achievement  of the
milestone event for which such payment is due.

                  3.2 (a) Unless TITAN instructs  NOVARTIS in writing otherwise,
all cash payments by NOVARTIS to TITAN (including,  without limitation,  upfront
payments, milestone payments, and royalties) shall be made by bank wire transfer
as follows:

                           Bank of America-San Francisco
                           ABA #121000358
                           Titan Pharmaceuticals, Inc.
                           Account #1493-0-04020

                           (b) All cash payments by NOVARTIS to HMRI (including,
without limitation, milestone payments and royalties) shall be made by bank wire
transfer as follows:

                           Citibank-New York
                           ABA#021000089
                           Hoechst Marion Roussel, Inc.
                           Account #-40552555

                           (c) At  least  two (2)  business  days  prior  to the
planned wire  transfer to either of the above  accounts,  NOVARTIS  shall notify
TITAN's Chief  Financial  Officer by facsimile (650)  244-4956,  Attention:  Mr.
Robert Farrell) and HMRI's Treasurer (if applicable) by facsimile (816-966-3847,
Attention: Cash Manager) of the amount and date the cash shall be transferred.


                                      -21-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

                           (d)  In the  event  of a late  payment  hereunder  by
NOVARTIS to TITAN (or HMRI, as the case may be), NOVARTIS shall pay to TITAN (or
HMRI, as the case may be) interest based on the prime rate as stated in The Wall
Street  Journal,  New York  edition,  on the date  such  payment  is due (or the
immediately preceding business date if such payment date is not a business date)
plus two percent (2%) on the outstanding  balance until such balance,  including
interest,  is paid in full to TITAN.  The  acceptance of such late payment shall
act as a waiver  of any  rights  TITAN  may have  hereunder  due to a breach  by
NOVARTIS relating solely to such payment being made late.

                  3.3 As consideration for the sublicense granted to NOVARTIS in
this  Sublicense  Agreement,  NOVARTIS  shall pay to TITAN,  in those  countries
where, and for the period,  PATENTS claiming a priority date of May 19, 1989 and
December 29, 1989 in a particular  country in the  TERRITORY  for which a patent
had been granted validly claiming Iloperidone or the manufacture, formulation or
the use  thereof for use in the FIELD  exist:  (a) a [ * ] royalty on annual NET
SALES of PRODUCT in the TERRITORY up to [ * ], and (b) a [ * ] royalty on annual
NET  SALES of  PRODUCT  in the  TERRITORY  in  excess  of [ * ]; in each case on
NOVARTIS',  its AFFILIATES' and SUBLICENSEES' annual NET SALES of PRODUCT in the
TERRITORY.

                  3.4 (a) In order to spread royalty  payments  hereunder over a
sufficient  period of time, in each of those  countries in the  TERRITORY  where
PATENTS  claiming a priority  date of May 19,  1989 and  December  29, 1989 in a
particular country for which a patent had been granted


                                      -22-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

validly claiming Iloperidone or the manufacture,  formulation or use thereof for
use in the FIELD have expired, NOVARTIS' obligations to pay royalties for use of
PATENTS in such country shall cease, and NOVARTIS and/or any of its SUBLICENSEES
shall pay directly to HMRI a royalty for KNOW-HOW not relating to  manufacturing
(whether or not such KNOW-HOW continues as a valid  intellectual  property right
or is in the  public  domain) of [ * ] on  NOVARTIS',  its  AFFILIATES'  and any
SUBLICENSEES'  annual NET SALES of PRODUCT in each such  country for a period of
ten (10) years after the expiration of the final  remaining  PATENT in each such
country.  After  the end of such ten (10)  year  period,  no  further  royalties
arising from sales of PRODUCT in such country  shall be due to HMRI and NOVARTIS
shall be entitled to continue to use the KNOW-HOW on a  fully-paid,  irrevocable
basis in accordance with Section 10.3.

                           (b) In the event a THIRD PARTY's  generic  version of
Iloperidone  is actively  marketed  in a process  patent  country  (that is, any
country in which only protection in relation to processes for the manufacture of
Iloperidone  has been  obtained  and not  protection  for  Iloperidone  as a new
chemical entity per se) in the TERRITORY  where a PATENT(s)  claiming a priority
date of May 19, 1989 and  December 29, 1989 has been  granted  validly  claiming
Iloperidone or the manufacture,  formulation or use thereof for use in the FIELD
exists,  then  subject to Sections  3.4(c) and (d) below,  the royalty rate that
NOVARTIS  shall pay to TITAN on NOVARTIS' or its  AFFILIATE's  or  SUBLICENSEE's
annual NET SALES of PRODUCT in that process  patent country shall be [ * ] until
such PATENT(s) expires, provided:


                                      -23-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

                           (i) NOVARTIS has  obtained,  or has made every effort
                  to obtain,  the maximum  allowable  period of  exclusivity  to
                  which it is entitled based on PRODUCT's  registration  data in
                  that process patent country to the extent such  exclusivity is
                  available; and

                           (ii) The PARTIES and HMRI, in accordance with Article
                  8 of this Sublicense Agreement,  will implement an appropriate
                  strategy for addressing the  commercialization  of Iloperidone
                  by  said  THIRD  PARTY.  Unless  otherwise  agreed  to by  the
                  PARTIES,  NOVARTIS  shall at its  sole  cost be  obligated  to
                  diligently   enforce  PATENT(s)  until  there  is  a  binding,
                  unappealable   judicial   determination   as  to  whether  the
                  manufacture,  formulation  or use of such  generic  version of
                  Iloperidone infringes PATENT(s) or until it is demonstrated to
                  the  satisfaction of both PARTIES that PATENT(s) are not being
                  infringed in such country

                  (c) If it is demonstrated to the satisfaction of both PARTIES.
or the binding,  unappealable  judicial  determination  under Section 3.4(b)(ii)
holds that PATENT(s) are not being infringed in such process patent country, the
royalty rate that NOVARTIS shall pay to TITAN on NOVARTIS' or its AFFILIATE's or
SUBLICENSEE's  annual NET SALES of PRODUCT in that process  patent country shall
continue to be [ * ] until such PATENT(s) expires.

                  (d) If the binding,  unappealable judicial determination under
Section  3.4(b)(ii)  holds that  PATENT(s)  are being  infringed in such process
patent  country,  NOVARTIS  shall take  reasonable  steps to have  enforced such
determination. If as a result, the commercialization of Iloperidone by the THIRD
PARTY in that country is discontinued:


                                      -24-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

                           (i) the royalty  rate(s) that  NOVARTIS  shall pay to
                  TITAN on NOVARTIS' or its AFFILIATE's or SUBLICENSEE's  annual
                  NET SALES of PRODUCT in that process  patent country shall be,
                  commencing  on the  later  of:  (A)  the  date  such  binding,
                  unappealable judicial  determination is rendered,  and (B) the
                  date   (if  any)   specified   in  such   determination   that
                  commercialization  of such  THIRD  PARTY  generic  version  of
                  PRODUCT is to be  discontinued,  those royalty rates  provided
                  for in Section 3.3 until such PATENT(s) expires; and

                           (ii)  NOVARTIS  shall repay to TITAN,  within  thirty
                  (30)  days  after the  later  of:  (A) the date such  binding,
                  unappealable judicial  determination was rendered, and (B) the
                  date   (if  any)   specified   in  such   determination   that
                  commercialization  of such  THIRD  PARTY  generic  version  of
                  PRODUCT  is  to  be  discontinued,  an  amount  equal  to  the
                  difference between the royalties that NOVARTIS would have paid
                  to TITAN under  Section 3.3, and the amount of royalties  that
                  NOVARTIS  actually  paid to TITAN  at the [ * ] rate,  for the
                  period  commencing  on the  date  the  royalty  rate  for that
                  process  patent  country  was  reduced  to [ * ]  pursuant  to
                  Section 3.4(b),  and ending on the later of: (A) the date such
                  binding, unappealable judicial determination was rendered, and
                  (B) the date (if any)  specified  in such  determination  that
                  commercialization  of such  THIRD  PARTY  generic  version  of
                  PRODUCT is to be discontinued.

                  (e) After  PATENT(s) in any process  patent  country  expires,
NOVARTIS and/or its SUBLICENSEE shall pay directly to HMRI royalties as provided
for in Section 3.4(a).

                  3.5 As  consideration  for the sublicense  granted to NOVARTIS
under this  Sublicense  Agreement in those  countries in the TERRITORY for which
(a) a PATENT application


                                      -25-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

for COMPOUND or PRODUCT is pending or (b) no PATENT  application  has been filed
or (c) PATENTS have been  abandoned or been held invalid or  unenforceable  by a
decision of a court or tribunal of competent  jurisdiction  from which no appeal
is or can be taken (collectively, "Non-Patent Countries"), NOVARTIS shall pay to
TITAN, on a country-by-country  basis, a [ * ] royalty for KNOW-HOW not relating
to manufacturing (whether or not such KNOW-HOW continues as a valid intellectual
property right or is in the public domain) on NOVARTIS', its AFFILIATES' and any
SUBLICENSEES'  annual  NET SALES of PRODUCT in the  Non-Patent  Countries  for a
period of five (5) years from the date of the first  commercial  sale of PRODUCT
in each such country by NOVARTIS, its AFFILIATES or SUBLICENSEES.  After the end
of such five (5) year period, no further royalties arising from sales of PRODUCT
in such country shall be due. However, with respect to Section 3.5(a) or (b), if
at any time during or after such five (5) year  period a PATENT for  COMPOUND or
PRODUCT is issued in such country, subject to Section 3.4, NOVARTIS shall pay to
TITAN,  from the date the PATENT was issued,  the same royalties as provided for
in Sections 3.3(a) and (b) above. Upon expiration of NOVARTIS' obligation to pay
a royalty  under such PATENT,  notwithstanding  Section 3.4, a [ * ] royalty for
KNOW-HOW not relating to manufacturing  (whether or not such KNOW-HOW  continues
as a valid intellectual property right or is in the public domain), on NET SALES
of  PRODUCT  in  such  country,  shall  be paid by  NOVARTIS  and/or  any of its
SUBLICENSEES  directly  to HMRI  for a  period  of five (5)  years  after  which
NOVARTIS  shall be entitled to  continue  to use the  KNOW-HOW on a  fully-paid,
irrevocable basis in accordance with Section 10.3.

         4. COMPULSORY LICENSES AND THIRD PARTY LICENSES.


                                      -26-
<PAGE>

                                                                    CONFIDENTIAL

                  4.1 (a) In the event that  during the term of this  Sublicense
Agreement a governmental  agency in the TERRITORY  grants or compels HMRI and/or
TITAN to grant a  license  to any THIRD  PARTY  for  COMPOUND  or  PRODUCT  in a
country(ies),  it is the intent of the parties that  NOVARTIS not be placed at a
competitive  disadvantage as a result of a lower royalty rate being granted to a
THIRD  PARTY  compulsory  licensee.  Therefore,  in the  event  TITAN or HMRI is
compelled  to grant a license to a THIRD  PARTY,  TITAN,  NOVARTIS and HMRI will
meet to  discuss in good  faith  equitable  arrangements,  which  could  include
adjustments  to  NOVARTIS'  original  royalty  rates  in  Section  3.3  of  this
Sublicense  Agreement  which  are to be paid on NET  SALES  of  PRODUCT  in such
country, to accomplish the intent of TITAN and NOVARTIS set forth above. In such
discussions,  consideration  will be given to TITAN's  obligations to HMRI under
Section 4.1(a) of the License Agreement.

                           (b) If a  governmental  authority in a country in the
TERRITORY  imposes a maximum  royalty  rate,  such that lower royalty rates than
would  otherwise  apply under this  Sublicense  Agreement  are  mandated in such
country,  then the royalty  rates  provided for herein shall be reduced to equal
such lower rates for sales of PRODUCT in such  country for the period such lower
royalty  rate is required  by any  governmental  authority  and shall cease when
NOVARTIS' royalty payment obligations cease under this Sublicense Agreement.

                  4.2 If, during the term of this Sublicense Agreement, HMRI and
NOVARTIS  agree  that a  patent(s)  of a THIRD  PARTY  exists  in the  TERRITORY
covering the manufacture,  use or sale of COMPOUND or PRODUCT,  and if it should
prove,  in  the  reasonable  judgment  of  NOVARTIS  and  HMRI,  impractical  or
impossible for NOVARTIS or its AFFILIATES or


                                      -27-
<PAGE>

                                                                    CONFIDENTIAL

SUBLICENSEES to continue the activity or activities sublicensed hereunder in the
FIELD without  obtaining a  royalty-bearing  license from such THIRD PARTY under
such patent(s) or if NOVARTIS and HMRI otherwise  agree it is desirable for HMRI
to acquire any THIRD PARTY patent or license in connection  with the development
or manufacture of COMPOUND or PRODUCT covered by PATENTS in the TERRITORY,  then
in either case the provisions of Section 8.8(c) shall apply.

                  4.3 If,  after  attempting  in good faith to resolve the issue
relating to  licensing  THIRD PARTY  patents in Section 4.2 between  themselves,
NOVARTIS and HMRI are unable to agree  within  ninety (90) days as to whether it
is  impracticable or impossible for NOVARTIS , its AFFILIATES or SUBLICENSEES to
continue the activity or activities  sublicensed  hereunder  without obtaining a
royalty-bearing  license from a THIRD  PARTY,  the issue shall be submitted to a
disinterested,  competent and experienced patent attorney reasonably  acceptable
to both NOVARTIS and HMRI for  resolution.  If NOVARTIS and HMRI cannot agree on
the  selection  of such patent  attorney,  then each party shall select a patent
attorney and the selected patent  attorneys  shall select a mutually  acceptable
patent  attorney who will determine  whether such THIRD PARTY rights  materially
inhibit  NOVARTIS'  ability  to  manufacture,  distribute  or sell  COMPOUND  or
PRODUCT. The compensation to, and expense of such patent attorney shall be borne
by the party whose position is not upheld by such patent  attorney (that is, for
example,  if the patent attorney  determines that such THIRD PARTY rights do not
materially inhibit NOVARTIS' ability to manufacture, distribute or sell COMPOUND
or PRODUCT, then the costs of such patent attorney shall be borne by NOVARTIS).


                                      -28-
<PAGE>

                                                                    CONFIDENTIAL

         5. DEVELOPMENT.

                  5.1 Upon the signing of this  Sublicense  Agreement,  NOVARTIS
shall  have  full  legal and  financial  responsibility  for all costs  that are
incurred  and all  activities  that are  undertaken  after the  signing  of this
Sublicense  Agreement,  which are related to  development,  safety and  required
periodic  reporting  to the  FDA and  equivalent  ex-U.S.  regulatory  agencies,
marketing,  regulatory  approvals,  price  registrations,  and other  activities
required  by  NOVARTIS  or its  SUBLICENSEE(S)  (or their  respective  agents or
distributors)   to  obtain   appropriate   government   approvals  for,  and  to
commercialize,  COMPOUND and PRODUCT in the  TERRITORY.  Other than as expressly
provided for in Section 5.4,  NOVARTIS  shall not assume,  nor shall NOVARTIS be
liable for, any costs or activities (whether scientific, financial or otherwise)
relating to the COMPOUND or PRODUCT that were  incurred or  undertaken  prior to
the signing of this  Sublicense  Agreement  (including  without  limitation  any
costs,  expenses,  damages,  losses,  fines,  penalties  or the like that may be
awarded or assessed after the signing of this  Sublicense  Agreement,  but which
arise out of events and  activities  that occurred  prior to the signing of this
Sublicense Agreement).

                  5.2 Provided that the AFFILIATES, SUBLICENSEES and other THIRD
PARTIES agree to substantially the same terms of  confidentiality in Section 6.4
hereof,  NOVARTIS may appoint such  AFFILIATES,  SUBLICENSEE(S)  and other THIRD
PARTIES  to  perform  any and all  development  activities  necessary  to obtain
government  approvals  for  PRODUCT in the  TERRITORY.  The  appointment  of any
SUBLICENSEE shall require HMRI's prior written consent,  which consent shall not
be unreasonably withheld.


                                      -29-
<PAGE>

                                                                    CONFIDENTIAL

                  5.3 NOVARTIS  shall,  in a manner  consistent  with the effort
NOVARTIS devotes to its own products having the same or similar  potential value
as PRODUCT,  exercise its  reasonable  efforts and diligence in  developing  and
commercializing  PRODUCT,  and in undertaking those  investigations  and actions
required to obtain appropriate  governmental  approvals to manufacture  COMPOUND
and market  PRODUCT in the  TERRITORY.  All such activity shall be undertaken at
NOVARTIS'  expense.  TITAN  shall  arrange  with HMRI to provide  assistance  or
consultation  at NOVARTIS'  expense in support of the development of COMPOUND or
PRODUCT, but HMRI in its discretion may limit such assistance and consultation.

                  5.4 All  direct  costs  incurred  by, or on behalf  of,  TITAN
relating to the  development  and  registration  of COMPOUND  and PRODUCT in the
TERRITORY  will be  reimbursed  to TITAN by NOVARTIS  within thirty (30) days of
execution by both parties of this Sublicense  Agreement.  The parties agree that
direct  costs  incurred  by or on  behalf  of  TITAN  through  August,  1997 are
approximately   one  million  seven  hundred  thousand   dollars   ($1,700,000).
Additional  direct  costs  estimated  to be  incurred  by or on  behalf of TITAN
through date of execution  of the Heads of Agreement  between the parties  dated
October 21, 1997, are approximately  three hundred thousand dollars  ($300,000).
Additional direct costs estimated to be incurred by or on behalf of TITAN in the
period from the date of the Heads of Agreement  until the effective date of this
Sublicense  Agreement  will be determined by the scope of that part of the Phase
III clinical  program for PRODUCT that was  initiated by TITAN prior to the date
hereof and  called  "Clinical  Protocol  300",  but will not exceed one  million
dollars ($1,000,000). The PARTIES further agree that:


                                      -30-
<PAGE>

                                                                    CONFIDENTIAL

                           (a) TITAN will be  informed  by  NOVARTIS on a timely
and regular basis of the  development,  registration  and  commercialization  of
COMPOUND and PRODUCT in the TERRITORY, and will have an opportunity to regularly
meet with  NOVARTIS  and provide  input into the  development  and  registration
process, and

                           (b) all of TITAN's  contractual  obligations to THIRD
PARTIES  involved in the development and  registration  process for the COMPOUND
and PRODUCT (including Contract Research Organizations (CROs) existing as of the
date of this  Sublicense  Agreement,  which CROs are  identified in Appendix E),
will be honored to the extent they are not inconsistent with NOVARTIS'  Standard
Operating Procedures.  However, if any such contractual obligation is terminated
by or at the request of NOVARTIS,  NOVARTIS will be responsible  for the payment
of any amounts that may be due as a result of such termination.

                           (c)  NOVARTIS   shall  be  solely   responsible   for
negotiation  of contracts  with any CROs and other  organizations  it desires to
work on development  activities relating to COMPOUND and/or PRODUCT and NOVARTIS
shall bear all legal and financial responsibility under such contracts.

                  5.5 Any inventions or discoveries or improvements  which arise
from  NOVARTIS',   its  AFFILIATES'  or  SUBLICENSEES'   work  relating  to  the
development  and/or manufacture of the COMPOUND and/or PRODUCT shall be owned by
NOVARTIS  , but shall be  licensed  to HMRI,  at HMRI's  option on a  worldwide,
nonexclusive,  perpetual basis, at a license fee and/or royalty to be negotiated
at such time.  Furthermore,  it is agreed that NOVARTIS and TITAN's  sublicensee
for Japan (if any) shall license to each other, for use in the other party's


                                      -31-
<PAGE>

                                                                    CONFIDENTIAL

TERRITORY in the FIELD, on a non-exclusive  royalty-free basis, any discoveries,
improvements  or  inventions  relating to COMPOUND and  PRODUCT,  and TITAN will
require such reciprocal  rights for NOVARTIS from TITAN's  sublicensee for Japan
(if any). To the extent  permitted under the License  Agreement,  NOVARTIS shall
have the right to license or  sublicense,  as the case may be, its  discoveries,
improvements or inventions.

                  5.6 (a) In the event uses or indications for COMPOUND  outside
the FIELD are identified by HMRI, TITAN or NOVARTIS, NOVARTIS shall notify TITAN
of such other uses or  indications  if identified  by NOVARTIS,  and TITAN shall
notify  NOVARTIS  of such other uses or  indications  if  identified  by HMRI or
TITAN.  If so desired by NOVARTIS,  TITAN shall  transfer to  NOVARTIS,  TITAN's
right of first  negotiation  under Section 5.6 of the License  Agreement,  for a
separate  license  from HMRI to develop  and  commercialize  such other uses and
indications  under terms to be negotiated in good faith at such time. Such right
of first  negotiation  shall mean that HMRI shall offer to NOVARTIS the right to
develop and  commercialize  such uses and indications  under a separate license,
the financial  terms of which may be no less favorable than the financial  terms
provided  for in the  License  Agreement,  except  that  NOVARTIS  shall  not be
required to pay to HMRI or TITAN any upfront license fees or milestone payments.
If TITAN has transferred to NOVARTIS such right of first  negotiation,  HMRI and
NOVARTIS shall  negotiate in good faith for a period of ninety (90) days and, if
the parties  are unable to enter into a separate  definitive  written  agreement
regarding  such  license by the end of such ninety  (90) day period,  HMRI or an
AFFILIATE  shall  be  free  to  develop  and  commercialize  such  other  use or
indication itself or to enter


                                      -32-
<PAGE>

                                                                    CONFIDENTIAL

into a license or other agreement with TITAN or a THIRD PARTY, and shall have no
further  obligations to negotiate with NOVARTIS or further  license  obligations
with respect thereto.

                           (b) If  NOVARTIS  acquires  the right to develop  and
commercialize a use or indication outside the FIELD for the COMPOUND pursuant to
Section  5.6(a),  this  Sublicense  Agreement shall be amended by the parties to
include  such other use or  indication,  such that the FIELD will be expanded to
include such other use or indication,  and NOVARTIS will be obligated to develop
and  commercialize  such other use or  indication in the TERRITORY to the extent
required under this Sublicense Agreement.

                           (c) To the extent TITAN acquires the right to develop
and  commercialize a use or indication  outside the FIELD for the COMPOUND under
the License  Agreement,  such other use or  indication  will be offered first to
NOVARTIS for the  TERRITORY.  If NOVARTIS  accepts such offer,  the parties will
negotiate  in good faith an amendment  to this  Sublicense  Agreement to include
such other use or  indication,  such that the FIELD will be  expanded to include
such other use or  indication,  and  NOVARTIS  will be  obligated to develop and
commercialize  such  other use or  indication  in the  TERRITORY  to the  extent
required under this Sublicense Agreement. If NOVARTIS does not accept such other
use or indication, TITAN will be free to offer such other use or indication to a
THIRD PARTY, even in the TERRITORY,  without further obligation to NOVARTIS with
respect to such other use or  indication;  provided,  however,  that  TITAN,  if
requested  and with the  support of  NOVARTIS,  will use  reasonable  efforts to
ensure that such "new product" can be commercially  differentiated in such a way
(formulation,  dosage, delivery system and/or other measures of distinctiveness)
as to discourage interchangeability and free substitution


                                      -33-
<PAGE>

                                                                    CONFIDENTIAL

between such "new product" and PRODUCT on the marketplace.  If a license to such
other use or indication is granted to a THIRD PARTY,  it will be limited  solely
to such other use or indication,  and the THIRD PARTY licensee will not have the
right to develop or sell COMPOUND in the FIELD in the TERRITORY  during the term
of this Sublicense Agreement.

                           (d) If neither TITAN nor NOVARTIS  acquires the right
to develop and commercialize  such other use or indication outside the FIELD for
COMPOUND  under the License  Agreement,  HMRI or an  AFFILIATE  shall be free to
develop and commercialize such other use or indication itself or to enter into a
license  or other  agreement  with a THIRD  PARTY,  and  shall  have no  further
obligations to negotiate with TITAN or NOVARTIS or further  license  obligations
with respect thereto.

                  5.7 In  addition  to that  which  is  required  under  Section
5.4(a),  NOVARTIS shall provide to TITAN regular  written reports at least every
six  (6)  months  setting  forth  significant   developments  and  improvements,
including  the  status  and  progress  of the  development  and/or  registration
activities, that affect COMPOUND or PRODUCT.

                  5.8 NOVARTIS, or its SUBLICENSEES, shall promptly advise TITAN
in writing upon the submission and filing for government  regulatory approval to
manufacture  and market PRODUCT,  and upon the receipt of government  regulatory
approval to market PRODUCT,  in each case in each country in the TERRITORY,  and
shall commence marketing PRODUCT in such country in accordance with Section 5.3.

                  5.9 Subject to applicable  laws and  regulations,  labeling on
all  PRODUCT  sold by or on  behalf  of  NOVARTIS  pursuant  to this  Sublicense
Agreement, and all advertising,


                                      -34-
<PAGE>

                                                                    CONFIDENTIAL

marketing and promotional materials used in connection therewith,  will identify
TITAN as the licensor of the PRODUCT.

                  5.10 If at any time  during  the  term  hereof  a  product  is
developed by NOVARTIS or any of its  AFFILIATES or  SUBLICENSEES,  which product
contains COMPOUND and one or more other pharmaceutically  active ingredients for
use in the FIELD (a "Combination Product"),  TITAN shall negotiate in good faith
with HMRI an amendment to the License  Agreement,  which amendment will provide,
inter alia,  for how royalties to be paid by TITAN to HMRI for NET SALES of such
Combination  Product will be calculated and for how long such royalties shall be
paid.  After such amendment to the License  Agreement has been executed by TITAN
and HMRI,  this  Sublicense  Agreement  shall be similarly  amended by TITAN and
NOVARTIS to provide for such Combination Product.

         6. EXCHANGE OF INFORMATION AND CONFIDENTIALITY.

                  6.1 Upon the signing of this Sublicense Agreement, TITAN shall
deliver to NOVARTIS,  all available  KNOW-HOW,  documents,  information and data
which  is  owned  or  controlled  by  TITAN  and its  AFFILIATES,  which  may be
reasonably expected to assist NOVARTIS in developing, registering, manufacturing
and marketing COMPOUND and PRODUCT in the TERRITORY. After the execution of this
Sublicense  Agreement,  there shall be a sixty (60) day transition period during
which TITAN shall provide, at its own cost, reasonable resources, expertise, and
documents to  effectively  transfer the  KNOW-HOW  and  development  activity to
NOVARTIS. Upon TITAN's receipt of the upfront license fee referred to in Section
3.1(a)  hereof,   NOVARTIS  and  TITAN  each  shall  promptly   provide  written
notification to the FDA that TITAN


                                      -35-
<PAGE>

                                                                    CONFIDENTIAL

assigns and that  NOVARTIS  assumes  sponsorship  of the U.S. IND No. 36,827 (as
specified in 21 CFR 314.72). Within ten (10) days after the date of such written
notification,  TITAN  shall  transfer  the U.S.  IND for  COMPOUND or PRODUCT to
NOVARTIS.  Until such  transfer is made,  NOVARTIS  shall have the right to make
reference  to such  COMPOUND  or  PRODUCT  owned or  controlled  by TITAN or its
AFFILIATES.  Furthermore,  upon  TITAN's  receipt  of the  upfront  license  fee
referred to in Section  3.1(a),  TITAN shall arrange for the transfer by HMRI to
NOVARTIS of Canadian IND Control No. 27740.

                  6.2 NOVARTIS shall have EXCLUSIVE use, subject to the terms of
this  Sublicense  Agreement  and in  particular  Section  2.3, of all  KNOW-HOW,
documents,  information,  data and material for the  development,  registration,
manufacture  and  marketing  of COMPOUND and PRODUCT for use in the FIELD in the
TERRITORY.  HMRI  (under  the  License  Agreement),  TITAN and their  respective
AFFILIATES shall keep confidential all KNOW-HOW, documents, information and data
in their  possession  or received  from or generated by or on behalf of NOVARTIS
that is not  already in the public  domain  relating  to  COMPOUND  and  PRODUCT
regarding  the use in the FIELD  with the same  level of care TITAN uses for its
own  confidential  information.  Upon  TITAN's  request  during the term of this
Sublicense  Agreement,  NOVARTIS  shall  deliver  to  TITAN a copy  of all  such
information  and data in a form to be mutually  agreed upon,  within thirty (30)
days after TITAN's request, it being understood and agreed that any and all such
information  and data  will be made  available  by TITAN  to HMRI,  upon  HMRI's
request.

                  6.3 Subject to the confidentiality obligations of this Article
6, NOVARTIS  shall make available and HMRI and TITAN shall be able to freely use
KNOW-HOW and documents,


                                      -36-
<PAGE>

                                                                    CONFIDENTIAL

information and data relating to COMPOUND and/or PRODUCT  disclosed or generated
by NOVARTIS,  its AFFILIATES and  SUBLICENSEES  and  applications for government
approvals (United States or EUROPEAN UNION),  reports on the status and progress
of the  development  of  COMPOUND  or PRODUCT  and the like in any  country(ies)
deleted from the  TERRITORY and as to which this  Sublicense  Agreement has been
terminated  pursuant  to the  terms  hereof.  Furthermore,  if  TITAN  grants  a
sublicense(s)  to a THIRD  PARTY(IES) for Japan,  NOVARTIS  agrees to share with
such THIRD  PARTY(IES)  any data and  information  (including  pre-clinical  and
clinical  results)  requested by such THIRD PARTY (IES) that have been generated
by or on  behalf  of  NOVARTIS  regarding  the  COMPOUND  and  PRODUCT  and  all
regulatory  submissions  relating  thereto,  but only to the  extent  such THIRD
PARTY(IES) agree to share with NOVARTIS, if requested, all such similar data and
information  generated  by or on  behalf  of such  THIRD  PARTY(IES);  provided,
however,  that should NOVARTIS or such THIRD PARTY(IES) submit to any regulatory
agency(ies)  said data generated by the other,  or  modifications  thereof,  the
benefiting  party  shall  compensate  the party  supplying  said  data,  for the
supplying party's  contributions to the data required for the benefiting party's
regulatory submissions, which compensation shall be agreed to in good faith.

                  6.4  During  the  period  of time  during  which  NOVARTIS  is
obligated  to pay  royalties  hereunder  and for  seven  (7)  years  thereafter,
irrespective  of  any  termination  with  respect  to a  particular  country  or
countries  in the  TERRITORY,  NOVARTIS  shall not reveal or  disclose  to THIRD
PARTIES or use for any purpose other than to perform its obligations  herein any
Confidential  Information (as defined below) without first obtaining the written
consent of TITAN,


                                      -37-
<PAGE>

                                                                    CONFIDENTIAL

except  as may be  otherwise  provided  herein,  or for  securing  essential  or
desirable  authorizations,  privileges,  licenses,  registration  or rights from
governmental  agencies,  or is required to be disclosed to a governmental agency
or is necessary to file or prosecute PATENT applications  concerning COMPOUND or
PRODUCT or to carry out any litigation concerning COMPOUND or PRODUCT; provided,
however, that NOVARTIS notifies TITAN in writing in a reasonably sufficient time
frame  prior to  making  such  disclosure  that  NOVARTIS  intends  to make such
disclosures and the details thereof,  and NOVARTIS seeks confidential  treatment
where  available  of  such  Confidential   Information  from  such  governmental
agencies.  This  confidentiality  obligation shall not apply to such information
which is or becomes a matter of public knowledge  through no fault of NOVARTIS',
or is already in the possession of NOVARTIS as evidenced by written records,  or
is  disclosed  to  NOVARTIS  by a THIRD  PARTY  having the right to do so, or is
subsequently  and  independently  developed  by  employees  of  NOVARTIS  or its
AFFILIATES who had no knowledge of the Confidential Information.  NOVARTIS shall
take  reasonable  measures to assure that no  unauthorized  use or disclosure is
made by others to whom access to such  information  is granted.  As used herein,
"Confidential Information" means, any confidential or proprietary information of
HMRI or TITAN or their  AFFILIATES,  including  any present or future  formulas,
research  project,  work  in  process,  inventions,   procedures,   development,
scientific, engineering, manufacturing, marketing, business or financial plan or
records,  products,  sales,  suppliers,  customers,  or investors,  whether such
confidential  or  proprietary  information  is  in  oral,  written,  graphic  or
electronic  form  (including  all  copies  in  whole  or in  part  of any of the
foregoing) and which derives value from being known to the disclosure or owner.


                                      -38-
<PAGE>

                                                                    CONFIDENTIAL

                  6.5 After  transfer of the United  States and Canadian INDs to
NOVARTIS under Section 6.1,  TITAN and NOVARTIS shall  cooperate with respect to
the exchange of adverse event and safety  information  associated  with COMPOUND
and PRODUCT,  and such  information  shall be coordinated  by NOVARTIS'  central
Clinical Safety and Epidemiology organization. Details of the obligations of the
parties with respect to reporting such information to each other, and processing
of this  data  shall be  covered  in an  addendum  following  execution  of this
Sublicense Agreement.

                  6.6 Nothing  herein shall be construed as preventing  NOVARTIS
from   disclosing  any   information   received  from  TITAN  to  an  AFFILIATE,
SUBLICENSEE,  distributor, contractor, agent, consultant, legal counsel or other
THIRD PARTY involved in the development,  manufacture,  marketing,  promotion or
sale of COMPOUND or PRODUCT,  provided such  AFFILIATE or  SUBLICENSEE  or other
THIRD PARTY has undertaken a similar obligation of confidentiality  with respect
to the Confidential Information.

                  6.7 In the event that a court or other legal or administrative
tribunal,  directly or through an appointed master, trustee or receiver, assumes
partial or complete  control over the assets of NOVARTIS based on the insolvency
or bankruptcy of NOVARTIS,  NOVARTIS  shall  promptly  notify the court or other
tribunal  (i) that  Confidential  Information  received  from TITAN  remains the
property of HMRI or TITAN, or their respective  AFFILIATES,  as the case may be,
and (ii) of the confidentiality  obligations under this Sublicense Agreement. In
addition,  NOVARTIS  shall,  to the  extent  permitted  by law,  take all  steps
reasonably  necessary  or  desirable  to  maintain  the  confidentiality  of the
Confidential Information of HMRI or TITAN, as the case may be, and to


                                      -39-
<PAGE>

                                                                    CONFIDENTIAL

ensure that the court, other tribunal or appointee maintains such information in
confidence in accordance with the terms of this Sublicense Agreement.

                  6.8 No  public  announcement  or  other  disclosure  to  THIRD
PARTIES concerning the existence of or terms of this Sublicense  Agreement shall
be made,  either  directly or  indirectly,  by either  party to this  Sublicense
Agreement,  except as may be  legally  required,  without  first  obtaining  the
approval of the other party, which approval shall not be unreasonably  withheld,
and shall be given within a reasonable time. The party desiring to make any such
public  announcement  or other  disclosure  shall provide the other party with a
written copy of the proposed announcement or disclosure in sufficient time prior
to  proposed  public  release,  to allow  such other  party to comment  upon the
nature,  text and timing of such  announcement or disclosure,  prior to proposed
public release.

                  6.9 Neither party shall submit for written or oral publication
any  manuscript,  abstract or the like which  includes  KNOW-HOW,  data or other
information  generated  and/or provided by HMRI,  TITAN or NOVARTIS  pursuant to
this Sublicense  Agreement  without first obtaining the prior written consent of
the party generating or providing such  information,  which consent shall not be
unreasonably  withheld.  The  contribution  of each party  shall be noted in all
publications or presentations by acknowledgment  or co-authorship,  whichever is
appropriate.

         7. TITAN SUPPLY OF COMPOUND AND PRODUCT TO NOVARTIS.

                  7.1 TITAN shall supply  COMPOUND and PRODUCT to NOVARTIS under
the following conditions:


                                      -40-
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                                                                    CONFIDENTIAL

                           (a)  Within a  reasonable  period  of time  after the
effective date of this Sublicense  Agreement as agreed to by the PARTIES in good
faith,  TITAN will, at no cost to NOVARTIS,  arrange for the transfer by HMRI to
NOVARTIS,  to a single site to be  designated  by NOVARTIS,  all  quantities  of
unmilled  COMPOUND  available  as of  the  effective  date  of  this  Sublicense
Agreement at HMRI,  Frankfurt,  Germany. The PARTIES recognize,  however, that a
portion of the  COMPOUND,  not to exceed one hundred  (100)  kilograms,  must be
reserved for use by TITAN's sublicensee for Japan, subject to Section 7.1(d).

                           (b) At no cost to NOVARTIS,  TITAN will arrange, upon
written  request by  NOVARTIS,  for the  transfer to a single site in the United
States to be designated by NOVARTIS,  of all  quantities of COMPOUND and PRODUCT
available as of the  effective  date of this  Sublicense  Agreement at Bio-Pharm
Pharmaceutics Services, Ft. Washington, Pennsylvania.

                           (c)  The  PARTIES  will  agree  in  good  faith  on a
procedure  which will allow  NOVARTIS to transfer  COMPOUND and PRODUCT to Japan
for use by the Japanese sublicensee.

                           (d) Title to, and risk of loss with  respect  to, all
COMPOUND and PRODUCT  supplied by TITAN to NOVARTIS under this Section 7.1 shall
pass to NOVARTIS  upon the receipt of such  COMPOUND  and PRODUCT by NOVARTIS or
its  designee at its point of  delivery;  provided  that with respect to the one
hundred (100) kilograms of COMPOUND reserved for use by TITAN's  SUBLICENSEE for
Japan under Section  7.1(a),  NOVARTIS  shall not be liable for any loss of such
COMPOUND except where such loss is the result of NOVARTIS' negligence or willful
misconduct.


                                      -41-
<PAGE>

                                                                    CONFIDENTIAL

                           (e)  TITAN   shall   provide  to   NOVARTIS  an  HMRI
certificate of analysis for any shipment of COMPOUND or PRODUCT.

                           (f) All  COMPOUND  and  PRODUCT  supplied by TITAN to
NOVARTIS for clinical trials will conform to the IND specifications  therefor as
well  as  all  laws  and  regulatory   requirements,   including   current  Good
Manufacturing  Practices,  applicable  to the  COMPOUND and PRODUCT when used in
said clinical trials in accordance with said IND.

                  7.2 TITAN shall provide information and assistance to NOVARTIS
with respect to COMPOUND and PRODUCT as follows:

                           (a) Within  sixty (60) days after the full  execution
and delivery of this Sublicense  Agreement,  TITAN shall deliver to NOVARTIS any
and all KNOW-HOW,  documentation, data and other information owned or controlled
by TITAN and its  AFFILIATES,  that  NOVARTIS  may  reasonably  require  for the
manufacture  of COMPOUND and PRODUCT.  Such  information  shall include  without
limitation the  specifications  for COMPOUND and PRODUCT and methods of analysis
for  testing  COMPOUND  and  PRODUCT,  as  currently  described  within  the IND
regulatory  documentation,   including   Chemistry-Manufacturing/Controls  (CMC)
information amendments and the technology transfer file.

                           (b)  TITAN  shall  arrange  for  HMRI to  provide  to
NOVARTIS  or  its  designated   THIRD  PARTY  assistance  for  the  transfer  of
manufacturing technology,  through documentation,  consultation and face-to-face
meetings,  to enable NOVARTIS or such THIRD PARTY to proceed with development of
commercial-scale  manufacturing.  If  requested by NOVARTIS or such THIRD PARTY,
TITAN shall visit the designated commercial manufacturing


                                      -42-
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                                                                    CONFIDENTIAL

facility,  with the limitation of three (3) visits, not to exceed a total of ten
(10) business  days,  for which  NOVARTIS shall bear all the costs of reasonable
travel and other out-of-pocket expenses.

                  7.3 HMRI has represented and warranted to TITAN, and TITAN has
relied in good faith upon such representation and warranty that:

                           (a) all COMPOUND and PRODUCT supplied hereunder shall
meet the specifications  therefor at the time COMPOUND and PRODUCT are delivered
to NOVARTIS or its designee;

                           (b) all COMPOUND and PRODUCT supplied hereunder shall
be  manufactured,  stored  and  shipped  in  accordance  with GMPs and all other
applicable laws and regulations; and

                           (c)  none  of  the   COMPOUND  or  PRODUCT   supplied
hereunder  shall be adulterated  or misbranded as provided for under  applicable
laws and regulations.

                  7.4 TITAN represents and warrants that:

                           (a) the  specifications  for COMPOUND and PRODUCT are
consistent with those set out in the INDs sponsored by TITAN; and

                           (b) as of the date of this Sublicense Agreement,  the
raw  materials  for the  manufacture  of COMPOUND  are readily  available in the
marketplace.

                  7.5  NOVARTIS  shall  return to HMRI all  unused  COMPOUND  or
PRODUCT supplied by TITAN to NOVARTIS hereunder.

         8. PATENT PROSECUTION; MAINTENANCE AND EXTENSION; INFRINGEMENT.


                                      -43-
<PAGE>

                                                                    CONFIDENTIAL

                  8.1 HMRI  shall be  responsible  for the  filing,  prosecution
(including oppositions) and maintenance of the PATENTS at HMRI's expense. For so
long as the license grants set forth in Article 2 remain in effect,  HMRI agrees
to file and prosecute and maintain the PATENTS in the  TERRITORY,  provided that
the foregoing is subject to HMRI's  reasonable  business  judgment.  TITAN shall
keep  NOVARTIS  informed,  to the same  extent  HMRI keeps  TITAN  informed,  of
important   issues  relating  to  the  preparation,   filing,   prosecution  and
maintenance of such patent  applications and patents.  NOVARTIS,  through TITAN,
shall have the right to comment on HMRI's preparation,  filing,  prosecution and
maintenance  of  patent  applications  and  PATENTS,  and  HMRI  shall  give due
consideration to NOVARTIS' comments, but HMRI shall make all decisions regarding
same.

                  8.2 If HMRI elects not to seek patent  protection in countries
listed in  Appendix F or to  maintain  patent  protection  on PATENTS  listed in
Appendix A in any  country in the  TERRITORY  to the extent that  PATENTS  claim
COMPOUND or PRODUCT (or  formulations,  use or  manufacture  thereof),  NOVARTIS
shall have the right, at its option and at HMRI's expense, which expense must be
approved in advance by HMRI (approval which shall not be unreasonably withheld),
to  file,  prosecute  (including  oppositions)  and  maintain  any  such  patent
applications  and patents in HMRI's name, and any patent issued  therefrom shall
be owned by HMRI.  TITAN shall advise NOVARTIS of HMRI's decision not to seek or
maintain patent  protection in a reasonably  timely manner.  In the event that a
PATENT is issued  covering  COMPOUND or PRODUCT in any country in the  TERRITORY
under the conditions of this Section 8.2,  NOVARTIS shall pay directly to HMRI a
three percent (3%) royalty on NET SALES of PRODUCT in such country, for a period


                                      -44-
<PAGE>

                                                                    CONFIDENTIAL

of five (5) years from the date of such  patent  issuance  in such  country,  in
recognition of HMRI's  KNOW-HOW and  manufacturing  rights and the right to make
and sell  COMPOUND  or PRODUCT in such  country.  Legal  fees and  expenses,  as
confirmed by HMRI,  incurred by NOVARTIS shall be deducted from the royalty paid
to HMRI.

                  8.3 Each of HMRI,  TITAN and NOVARTIS  shall make available to
the other, its employees,  agents,  subcontractors or consultants (including its
authorized  attorneys)  to the extent  reasonably  necessary or  appropriate  to
enable the appropriate party to file, prosecute and maintain patent applications
and resulting  patents subject to this  Sublicense  Agreement to the extent that
PATENTS claim COMPOUND or PRODUCT (or formulations, use or manufacture thereof).
Where appropriate,  each of HMRI, TITAN and NOVARTIS shall sign or cause to have
signed all  documents  relating  to said  patent  applications  or patents at no
charge to the other.

                  8.4 Promptly after it is notified by HMRI,  TITAN shall notify
NOVARTIS in writing of (a) the issuance of each PATENT  giving the date of issue
and patent number for each patent,  and (b) each notice pertaining to any PATENT
which HMRI receives as patent owner pursuant to the Drug Price  Competition  and
Patent Term  Restoration  Act of 1984, or other similar laws now or hereafter in
effect  which  extend  the  PATENT  life,  or  pursuant  to  comparable  laws or
regulations in other countries in the TERRITORY.  At HMRI's expense, HMRI, TITAN
and  NOVARTIS  shall  cooperate  with each other in  applying  for  patent  term
extensions  (including  Supplementary  Protection  Certificate in EUROPEAN UNION
member states) where applicable in any country of the TERRITORY. HMRI shall have
full  responsibility  and  authority in the decisions  regarding  filing for the
foregoing PATENT extensions at its own expense although NOVARTIS,


                                      -45-
<PAGE>

                                                                    CONFIDENTIAL

through TITAN,  shall be consulted and its opinions given due  consideration  in
such  decision-making  process.  If HMRI elects not to pursue  extension  of any
PATENTS,  NOVARTIS  shall have the right (but not the  obligation)  to apply for
such  extension  in  HMRI's  name  and at  NOVARTIS'  expense,  and  HMRI  shall
reasonably cooperate in the filing and procurement thereof.

                  8.5 Except as otherwise  expressly provided in this Sublicense
Agreement,  under no  circumstances  shall a party  hereto,  as a result of this
Sublicense  Agreement,  obtain any  ownership  interest in or other right to any
technology,  KNOW-HOW,  patents,  pending  patent  applications,   products,  or
biological  material  of the  other  party,  or  HMRI,  including  items  owned,
controlled,  discovered,  invented or developed by the other party,  or HMRI, or
transferred  by the other party or HMRI to said party,  at any time  pursuant to
this Sublicense  Agreement  which is not a direct result of the study,  KNOW-HOW
and  experimentation  of COMPOUND and PRODUCT.  It is understood and agreed that
this Sublicense  Agreement does not grant NOVARTIS any license to other uses for
COMPOUND or PRODUCT outside the FIELD.

                  8.6 Each of NOVARTIS,  TITAN and HMRI shall  promptly,  but in
any event no later than ten (10)  business  days after receipt of notice of such
action,  notify  the  other  in  writing  of any  PATENT  nullity  actions,  any
declaratory  judgment  actions or any  alleged  or  threatened  infringement  of
PATENTS or misappropriation  of intellectual  property comprising PATENTS, or if
NOVARTIS,  HMRI or TITAN, or any of their respective AFFILIATES or SUBLICENSEES,
shall be  individually  named as a defendant  in a legal  proceeding  by a THIRD
PARTY alleging  infringement of a patent or other intellectual property right of
such THIRD PARTY as a result of


                                      -46-
<PAGE>

                                                                    CONFIDENTIAL

the  manufacture,   production,   use,   development,   marketing,   selling  or
distribution  of COMPOUND  or PRODUCT,  or of any  information  or  notification
regarding the PATENTS.

                  8.7 HMRI shall have the first right to respond  to,  defend or
prosecute  any  actions,   challenges,   infringements,   misappropriations   or
proceedings by a THIRD PARTY alleging infringement  described in Section 8.6. In
the event HMRI elects to do so,  NOVARTIS will cooperate with HMRI and its legal
counsel,  join in such  suits as may be  brought by HMRI,  and be  available  at
HMRI's reasonable request to be an expert witness or otherwise to assist in such
proceedings  and at HMRI's  expense.  Through  TITAN,  HMRI will  cooperate with
NOVARTIS  and its legal  counsel and keep  NOVARTIS  and its counsel  reasonably
informed at all times as to the status of HMRI's response or defense.

                  8.8 In the event  that HMRI  elects to respond  to,  defend or
prosecute  any  actions,   challenges,   infringements,   misappropriations   or
proceedings  by a THIRD PARTY  claiming  infringement  described  in Section 8.6
hereof, then:

                           (a) legal fees and other  costs and  expenses of HMRI
associated with such response or defense shall be paid by HMRI;

                           (b)  legal   fees  and  other   costs  and   expenses
associated with such response or defense incurred by NOVARTIS at HMRI's request,
shall be paid by HMRI;

                           (c)  costs  of  acquiring   THIRD  PARTY  patents  or
licenses and any  settlement,  court award,  judgment or other  damages shall be
paid by HMRI to such THIRD  PARTIES out of  royalties  projected  to be received
from NOVARTIS (either directly or through TITAN); provided,  however, HMRI shall
not be obligated to pay for any patents or licenses for uses


                                      -47-
<PAGE>

                                                                    CONFIDENTIAL

of COMPOUND or PRODUCTS not disclosed in PATENTS as of the date of the execution
of the License Agreement; and

                           (d) any  amounts  recovered  from  THIRD  PARTIES  in
connection with such response or defense shall be applied fifty percent (50%) to
NOVARTIS  (through  TITAN),  and fifty percent  (50%) to HMRI,  subject first to
reimbursement of expenses of HMRI, NOVARTIS and TITAN.

                  8.9 In the event that HMRI elects not to respond to, defend or
prosecute  any  actions,   challenges,   infringements,   misappropriations   or
proceedings  by a THIRD PARTY  alleging  infringement  described  in Section 8.6
hereof or HMRI abandons any such action,  TITAN shall notify  NOVARTIS  promptly
after   receiving   notification   from  HMRI  of  such   actions,   challenges,
infringements,  misappropriations,  proceeding or HMRI's decision to abandon any
such action. In such event, NOVARTIS shall have the option to respond, defend or
prosecute such action at NOVARTIS' sole cost, provided that HMRI shall cooperate
with and provide assistance to NOVARTIS at HMRI's expense. All amounts recovered
from any THIRD PARTY shall be applied  fifty percent (50%) to NOVARTIS and fifty
percent  (50%) to HMRI,  subject  first to  reimbursement  of  expenses of HMRI,
NOVARTIS and TITAN.

                  8.10 In the event that HMRI and NOVARTIS  mutually  agree that
it is  desirable  for HMRI to  acquire  any THIRD  PARTY  patent or  license  in
connection with the development or manufacture of COMPOUND or PRODUCT covered by
PATENTS in the TERRITORY, then the costs of acquiring such THIRD PARTY patent or
license  shall be paid by HMRI to such THIRD  PARTIES out of royalties  received
from NOVARTIS (either directly or through TITAN). HMRI


                                      -48-
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                                                                    CONFIDENTIAL

shall not be  obligated  to pay for any patents or licenses for uses of COMPOUND
or PRODUCT  not  disclosed  in PATENTS  as of the date of the  execution  of the
License Agreement.

                  8.11 NOVARTIS recognizes that HMRI has reserved certain rights
in the  patents  set forth in  Appendix  A and that  there  may be a  legitimate
dispute  between the parties  whether a legal action should be brought against a
THIRD PARTY which could effect  HMRI's  reserved  rights under those patents and
NOVARTIS' sublicense rights under this Sublicense  Agreement.  In the event that
there is a dispute  between  NOVARTIS  and HMRI  regarding  whether  there is an
infringement  of PATENTS by a THIRD PARTY and  therefore  whether a legal action
should  be   initiated,   NOVARTIS   and  HMRI  shall  submit  the  issue  to  a
disinterested,  competent and experienced patent attorney reasonably  acceptable
to NOVARTIS and HMRI to determine  whether or not there is an  infringement  and
legal  actions  should  be  taken.  If  NOVARTIS  and HMRI  cannot  agree on the
selection of such a patent attorney,  then NOVARTIS and HMRI shall each select a
patent  attorney and those  selected  patent  attorneys  shall select a mutually
acceptable  patent  attorney.  That selected  patent  attorney  shall  determine
whether or not there is an  infringement  and legal  action  should be taken and
then  NOVARTIS and HMRI may decide  whether or not to initiate a legal action as
described by this Article 8. The  compensation  to, and expenses of, such patent
attorney shall be borne by the losing party.

         9. STATEMENTS AND REMITTANCES.

                  9.1  NOVARTIS  shall  keep,  and require  its  AFFILIATES  and
SUBLICENSEES  to keep complete and accurate  records of all NET SALES of PRODUCT
under the sublicenses  granted  herein.  HMRI and TITAN shall have the right, at
their expense, through a certified public


                                      -49-
<PAGE>

accountant or like independent  person  reasonably  acceptable to NOVARTIS , and
following  reasonable  notice,  to examine  such  records  under  conditions  of
confidentiality  during regular  business hours during the period of time during
which royalties are due and payable  hereunder and for two (2) years thereafter;
provided,  however,  that such examination  shall not take place more often than
once a year and shall not cover such records for more than the preceding two (2)
years; and provided further, that such accountant shall report to HMRI and TITAN
only as to the accuracy of the NET SALES computation and royalty  statements and
payments.  It is agreed that if this  Sublicense  Agreement is  terminated  with
respect to a particular country(ies), then HMRI's and TITAN's examination rights
shall continue with respect to sales of PRODUCT in such  country(ies) only for a
period  of two (2) years  after the  termination  of  sublicense  rights in that
country. Copies of all such accountant's reports shall be supplied to NOVARTIS .

                  9.2  Within  forty-five  (45)  days  after  the  close of each
calendar  quarter,  NOVARTIS  shall  deliver to TITAN a true  accounting  of all
PRODUCT sold by NOVARTIS , its AFFILIATES and  SUBLICENSEES  during such quarter
and shall at the same time pay all earned  royalties due. Such accounting  shall
show NET SALES of PRODUCT on a country-by-country and  product-by-product  basis
and such other  particulars  as are  reasonably  necessary for accounting of the
royalties payable hereunder.

                  9.3 Any tax paid or  required  to be  withheld  by NOVARTIS on
account of royalties  payable by NOVARTIS under this Sublicense  Agreement shall
be indicated on the accounting described in Section 9.2 hereof and deducted from
the amount of royalties  otherwise due.  NOVARTIS shall secure and send to TITAN
or HMRI, as the case may be, proof of any such taxes


                                      -50-
<PAGE>

                                                                    CONFIDENTIAL

withheld  and paid by  NOVARTIS.  Any  withholding  or other tax  arising  on or
following  permitted  assignment of this  Sublicense  Agreement by NOVARTIS or a
SUBLICENSEE shall be for the account of and paid by NOVARTIS .

                  9.4 Unless otherwise  indicated herein, and subject to foreign
exchange  regulations then prevailing,  to the extent free conversion from local
currency to United  States  dollars is  permitted,  all payments  and  royalties
payable under this Sublicense Agreement shall be paid in cash in U.S. dollars by
wire transfer in accordance with Section 3.2 hereof. If governmental regulations
prevent  remittances  from a foreign  country with respect to sales made in that
country,  the  obligation  of NOVARTIS to pay royalties on sales in that country
shall be suspended until such remittances are possible, but such royalties shall
accrue as an accounts  payable by NOVARTIS to TITAN or HMRI, as the case may be.
TITAN or HMRI,  as the case may be,  shall have the right,  upon giving  written
notice to NOVARTIS, to receive payment in that country in local currency.

                  9.5 Royalty  payments and NET SALES shall be calculated on the
basis of NOVARTIS' quarterly standard account of internal sales which represents
the  conversion of all local  currency  sales for a calendar  quarter into Swiss
francs at the average exchange rate (as routinely derived via NOVARTIS' standard
methodology)  for such  calendar  quarter in which the sales are  recorded.  The
exchange  rate  between  the Swiss franc and the U.S.  dollar for the  quarterly
royalty  payments  to TITAN or HMRI (as the case may be)  shall be the  exchange
rates published in the Foreign  Exchange column of The Wall Street Journal,  New
York edition,  or other qualified  source mutually  acceptable to the parties on
the last business day of the calendar  quarter for which the royalties are being
paid. Notwithstanding the foregoing, if there is a difference between any amount


                                      -51-
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                                                                    CONFIDENTIAL

that NOVARTIS pays to TITAN or HMRI (as the case may be) under Sections 3.3, 3.4
or 3.5,  and the amount  that TITAN is required to pay to HMRI under the License
Agreement  (which  difference  arises  as a  result  of  using  the  method  for
calculating  royalties  that are due and payable under this Section 9.5, and the
method  for  calculating  such  royalties  under  Section  9.5  of  the  License
Agreement),  the  shortfall  or excess (as the case may be) in royalty  payments
made by  NOVARTIS  under this  Section  9.5 shall be paid by NOVARTIS to HMRI or
TITAN (as the case may be) in the case of a shortfall,  and by TITAN to NOVARTIS
in the case of an excess payment by NOVARTIS to TITAN under Section 3.3 or 3.5.

         10. TERM AND TERMINATION.

                  10.1 (a)  NOVARTIS  will  have  the  right  to  terminate  the
sublicense for the TERRITORY or on a country-by-country basis for major problems
associated with PRODUCT as reasonably  determined by NOVARTIS . For this purpose
"major problems" are ones which would substantially  negatively impact PRODUCT's
chances for successful development, registration and/or commercialization in the
TERRITORY or such country, as applicable;  and would include, but not be limited
to,  major  safety  issues,  lack  of  efficacy,   unacceptable   pharmaceutical
properties or extraordinary  unforeseen competitive  developments which, in each
case, would have the substantial negative impact referred to above.

                           (b)  In  the  event  of  termination  in  the  entire
TERRITORY by NOVARTIS  pursuant to this Section  10.1,  NOVARTIS  shall,  within
thirty (30) days of such  termination,  return to TITAN any and all  information
and data  (including  new  information  and data)  relating to the  COMPOUND and
PRODUCT, whether generated by or on behalf of TITAN, HMRI or


                                      -52-
<PAGE>

                                                                    CONFIDENTIAL

NOVARTIS,  and make no further use thereof.  Additionally,  in such event,  this
Sublicense  Agreement shall terminate in its entirety and the sublicense granted
hereunder  shall revert back to TITAN.  TITAN shall  retain all upfront  license
fees and milestone  payments it had received up to the date of  termination  if,
and only if,  termination was not due to any  misrepresentations,  omissions (of
information  owned  or  controlled  by HMRI or its  AFFILIATES  or  TITAN or its
AFFILIATES  as of the  date  hereof)  or  falsifications  with  respect  to such
KNOW-HOW, information or data or fraud by HMRI or its AFFILIATES or TITAN or its
AFFILIATES,  in which case, subject to the following sentence, TITAN shall repay
to NOVARTIS,  within ninety-five (95) days of such termination,  that portion of
the upfront license fee and milestone  payments TITAN had received from NOVARTIS
up to the date of such termination  (including in the form of NOVARTIS' purchase
of  TITAN  convertible  preferred  stock).  In the  case of  misrepresentations,
omissions (of  information  owned or controlled by HMRI or its  AFFILIATES as of
the date hereof) or falsifications with respect to such KNOW-HOW, information or
data or fraud only by HMRI or its  AFFILIATES,  and a termination of the License
Agreement  pursuant  to Section  10.1 of the License  Agreement,  TITAN shall be
obligated to make the foregoing repayments to NOVARTIS if, and only if, HMRI has
repaid the upfront  license fee and  milestone  payments to TITAN under  Section
10.1 of the License Agreement.

                  10.2 In the event the  development  of COMPOUND and PRODUCT is
terminated  altogether  by  NOVARTIS by or before  January 1, 1998,  for reasons
other than those described in Section 10.1, then this Sublicense Agreement shall
terminate in its entirety and the sublicense granted hereunder shall revert back
to TITAN. TITAN shall retain all upfront license fees it had


                                      -53-
<PAGE>

THE  INFORMATION  BELOW,  MARKED BY * AND [ ], HAS BEEN  OMITTED  PURSUANT  TO A
REQUEST FOR  CONFIDENTIAL  TREATMENT.  THE OMITTED  PORTION HAS BEEN  SEPARATELY
FILED WITH THE COMMISSION.

                                                                    CONFIDENTIAL

received  up to the date of  termination  and  NOVARTIS  shall  also pay a [ * ]
penalty  payment  to  TITAN  if,  and only  if,  termination  was not due to any
misrepresentations, omissions (of information owned or controlled by HMRI or its
AFFILIATES or TITAN or its  AFFILIATES as of the date hereof) or  falsifications
with respect to KNOW-HOW, information or data or fraud by HMRI or its AFFILIATES
or TITAN or its AFFILIATES,  in which case,  subject to the following  sentence,
TITAN shall repay to NOVARTIS, within ninety-five (95) days of such termination,
that  portion  of the  upfront  license  fee and  milestone  payments  TITAN had
received from NOVARTIS up to the date of such termination (including in the form
of NOVARTIS'  purchase of TITAN  convertible  preferred  stock).  In the case of
misrepresentations, omissions (of information owned or controlled by HMRI or its
AFFILIATES  as of the date hereof) or  falsifications  with respect to KNOW-HOW,
information or data or fraud only by HMRI or its  AFFILIATES,  and a termination
of the  License  Agreement  pursuant to Section  10.2 of the License  Agreement,
TITAN shall be obligated to make the  foregoing  repayments  to NOVARTIS if, and
only if, HMRI has repaid the upfront license fee and milestone payments to TITAN
under Section 10.2 of the License Agreement.

                  10.3 Unless otherwise  terminated,  this Sublicense  Agreement
shall  expire on a  country-by-country  basis upon the  expiration  of NOVARTIS'
obligation  to pay  royalties  under  this  Sublicense  Agreement  in each  such
country.  Expiration of this Sublicense Agreement under this provision shall not
preclude NOVARTIS,  its AFFILIATES and SUBLICENSEES from continuing  directly or
indirectly  to  manufacture  COMPOUND  and  market and sell  PRODUCT  and to use
KNOW-HOW without further royalty payments.


                                      -54-
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                                                                    CONFIDENTIAL

                  10.4  In  the  event  there  is a  change  in the  control  of
NOVARTIS,  NOVARTIS  shall give TITAN  thirty (30) days  written  notice of such
event and that the  development  and  commercialization  of COMPOUND and PRODUCT
will continue per the terms of this Sublicense Agreement.

                  10.5  (a)  If  either   party   materially   defaults  in  its
performance of this Sublicense Agreement and if such default is not corrected or
if the party in default is not exercising  reasonably  diligent  efforts to cure
such default  within ninety (90) days after  receiving  written  notice from the
other party with respect to such default,  or if such default is not correctable
within  ninety (90) days then such other party shall have the right to terminate
this  Sublicense  Agreement  at the end of such period in its entirety by giving
written  notice  to the  party in  default.  In the  event  NOVARTIS  materially
defaults in its performance  under this  Sublicense  Agreement with respect to a
particular  country,  then,  subject to Section  11.4 hereof,  TITAN's  right to
terminate shall be limited to termination of the sublicense granted hereunder in
such country only.

                           (b) If TITAN  materially  defaults in its performance
of the  License  Agreement,  then  NOVARTIS  shall  have the  right  but not the
obligation  to correct or cure such  default in the place of TITAN at  NOVARTIS'
own cost and expense  within the ninety (90) day period  provided for in Section
10.5 of the License Agreement without prejudice to any other rights NOVARTIS may
have under this Sublicense Agreement,  provided that (i) NOVARTIS notifies TITAN
in writing of NOVARTIS' election to do so, and (ii) NOVARTIS' correction or cure
of such default does not increase TITAN's liability under the License Agreement.


                                      -55-
<PAGE>

                           (c) It is agreed  that a  material  default  by TITAN
under the  License  Agreement  shall be a material  default by TITAN  under this
Sublicense Agreement.

                  10.6 Subject to applicable  bankruptcy laws,  either party may
terminate this Sublicense  Agreement if, at any time, the other party shall file
in any court  pursuant to any statute of the United States or of any  individual
state or foreign  country,  a voluntary  petition in bankruptcy or insolvency or
for reorganization in bankruptcy or for an arrangement or for the appointment of
a receiver or trustee of the party or of its assets, or if the other party shall
be served  with an  involuntary  petition  against it,  filed in any  insolvency
proceeding,  and such  petition  shall not be dismissed  within ninety (90) days
after the filing  thereof,  or if the other party shall propose or be a party to
any dissolution,  or if the other party shall make an assignment for the benefit
of creditors.

                           (a) Without  limitation,  NOVARTIS' rights under this
Sublicense  Agreement shall include those rights  afforded by 11 U.S.C.  Section
365(n) of the United  States  Bankruptcy  Code and any  successor  thereto  (the
"Code"). If the bankruptcy trustee of TITAN as a debtor or  debtor-in-possession
rejects this Sublicense  Agreement  under 11 U.S.C.  Section 365(n) of the Code,
NOVARTIS may elect to retain its rights  sublicensed  from TITAN  hereunder (and
any other  supplementary  agreements hereto) for the duration of this Sublicense
Agreement  and avail  itself  of all  rights  and  remedies  to the full  extent
contemplated  by this Sublicense  Agreement and 11 U.S.C.  Section 365(n) of the
Code,  and  any  other  relevant   sections  of  the  Code  and  other  relevant
non-bankruptcy law.

         11. RIGHTS AND DUTIES UPON TERMINATION.


                                      -56-
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                                                                    CONFIDENTIAL

                  11.1 Upon  termination  of this  Sublicense  Agreement,  TITAN
shall have the right to retain any sums already paid by NOVARTIS hereunder,  and
NOVARTIS  shall pay all sums  accrued  hereunder  which  are then due  except as
otherwise defined in this Sublicense Agreement.

                  11.2 Upon early  termination of this  Sublicense  Agreement in
its entirety under Sections 10.1 or 11.6 or with respect to any country,  or due
to a breach  hereof by  NOVARTIS,  NOVARTIS  shall notify TITAN of the amount of
PRODUCT that NOVARTIS,  its AFFILIATES  and  SUBLICENSEES  then have on hand for
sale in each  country,  the sale of which  would,  but for the  termination,  be
subject  to  royalty,  and  NOVARTIS , its  AFFILIATES  and  SUBLICENSEES  shall
thereupon be permitted to sell that amount of PRODUCT,  provided  that  NOVARTIS
shall pay the royalty  thereon to TITAN or HMRI, as the case may be, at the time
herein provided for.

                  11.3 Expiration or termination of this Sublicense Agreement or
termination  on a  country-by-country  basis  shall  terminate  all  outstanding
obligations  and  liabilities  between the parties  arising from this Sublicense
Agreement  except  those  described  in Sections 6.2 (with sole respect to TITAN
confidentiality)  6.3, 6.4, 6.5, 6.6, 6.8, 9.1, 9.2, 10.1(b),  10.2, 10.3, 11.1,
11.2,  11.4,  11.5,  11.6, 12.5, 12.6, 12.7, 14.1 and 14.2, which sections shall
survive such termination. In addition, any other provision required to interpret
and enforce the parties' rights and obligations under this Sublicense  Agreement
shall also survive, but only to the extent required for the full observation and
performance of the surviving obligations under this Sublicense Agreement.

                  11.4 Except as  otherwise  specifically  provided  for herein,
termination, in whole or in part, of the Sublicense Agreement in accordance with
the  provisions  hereof  shall not limit  remedies to the  parties  which may be
otherwise available in law or equity, including consequential,


                                      -57-
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                                                                    CONFIDENTIAL

incidental  or indirect  damages (such as loss of sales,  profits,  or goodwill)
arising out of a party's  performance or  nonperformance  under this  Sublicense
Agreement.

                  11.5  Subject to  Section  11.2 and other  express  provisions
hereof, upon early termination of this Sublicense  Agreement in its entirety due
to breach  hereof by  NOVARTIS  and  pursuant to  Sections  10.1,  10.2 or 11.6,
NOVARTIS' rights in COMPOUND and PRODUCT shall cease,  NOVARTIS,  its AFFILIATES
and SUBLICENSEES  shall cease  manufacture,  development,  marketing and sale of
COMPOUND and PRODUCT in the TERRITORY, and all originals and copies of KNOW-HOW,
data, results and other information collected and/or generated by NOVARTIS,  its
AFFILIATES and SUBLICENSEES relating to COMPOUND or PRODUCT prior to termination
shall be delivered to TITAN within thirty (30) days  thereafter,  except for one
copy  thereof  which may be retained in NOVARTIS'  legal or other  appropriately
restricted  files  solely  for the  purpose  of  establishing  the extent of its
obligations  hereunder.  Any IND or other  regulatory  filing  effected prior to
termination  shall be assigned by NOVARTIS to TITAN (or its  designee(s),  which
designee could be HMRI), at TITAN's request and expense, if not already assigned
to TITAN.  NOVARTIS shall provide to TITAN,  within thirty (30) days of TITAN 's
request, copies of all regulatory correspondence, including, but not limited to,
IND Information Amendments, IND Reports, IND Safety Reports, NDA submission, NDA
Postmarketing  Reports, and reports of written/phone contacts to/from regulatory
agencies, as well as the safety database for PRODUCT.

                  11.6 If (a)  NOVARTIS is precluded  from selling  PRODUCT in a
particular  country(ies)  in the  TERRITORY by virtue of  infringement  of THIRD
PARTY patent rights, or (b) there is a holding of invalidity or unenforceability
of any PATENT, from which no further appeal


                                      -58-
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                                                                    CONFIDENTIAL

can be taken, that materially affects NOVARTIS' ability to commercialize PRODUCT
in a particular  country(ies)  in the  TERRITORY,  NOVARTIS shall have the right
(but  not  the  obligation)  to  terminate  this  Sublicense  Agreement  in such
country(ies).  At NOVARTIS' option, this Sublicense  Agreement may be terminated
in its entirety if the events described in subsection (a) or (b) of this Section
11.6 occur in the United States and/or,  the EUROPEAN UNION.  Within ninety-five
(95) days of any such  termination,  subject to the  following  sentence,  TITAN
shall repay to NOVARTIS if the Sublicense  Agreement has been  terminated in its
entirety,  that  portion  of the  upfront  license  fee and  milestone  payments
(including  in the form of  NOVARTIS'  purchase of TITAN  convertible  preferred
stock) it has received from NOVARTIS up to the date of termination. In the event
the License  Agreement  is  terminated  pursuant to Section  11.6 of the License
Agreement,  TITAN  shall  be  obligated  to make  the  foregoing  repayments  to
NOVARTIS,  but only to the extent  HMRI has repaid the  upfront  license fee and
milestone payments to TITAN under Section 11.6 of the License Agreement. If this
Sublicense   Agreement  has  been   terminated  only  with  respect  to  certain
country(ies),  the parties shall negotiate in good faith what smaller portion of
the upfront license fee and milestone  payments TITAN has received from NOVARTIS
up to such date shall be repaid to NOVARTIS;  provided,  however, if the License
Agreement has been terminated only with respect to such certain  countries under
Section  11.6 of the License  Agreement,  TITAN shall be  obligated to make such
repayments  to NOVARTIS  but only to the extent HMRI has repaid a portion of the
upfront  license fee and  milestone  payments to TITAN under Section 11.6 of the
License  Agreement.  If the parties are unable to agree on such smaller  portion
within  ninety (90) days,  the issue shall be  submitted  for  determination  by
arbitration in accordance with Section 14.2.


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                                                                    CONFIDENTIAL

         12. WARRANTIES, INDEMNIFICATIONS AND REPRESENTATIONS.

                  12.1 TITAN  represents  and  warrants  that to the best of its
knowledge at the date of this Sublicense Agreement:  (a) all currently issued or
pending  patents  and patent  applications  owned or  controlled  by HMRI or its
AFFILIATES  claiming  the  COMPOUND or PRODUCT are listed in Appendix A, and (b)
HMRI or its AFFILIATES owns or controls the entire right,  title and interest in
PATENTS  and  KNOW-HOW.  If  TITAN  becomes  aware  of  any  patents  or  patent
applications owned or controlled by HMRI or its AFFILIATES  claiming COMPOUND or
PRODUCT or manufacture,  formulation or use thereof not listed in Appendix A and
is within the rights  granted to NOVARTIS  in this  Sublicense  Agreement,  such
patents  and  patent  applications  shall be added to  Appendix  A at no cost to
NOVARTIS  .  TITAN  further  represents  and  warrants  that to the  best of its
knowledge  as of the date of this  Sublicense  Agreement:  (c)  TITAN's  written
contracts with CROs relating to COMPOUND or PRODUCT that are in effect as of the
effective date of this Sublicense  Agreement  (which contracts are identified in
Appendix E) are in full force and effect and  neither  TITAN nor any of the CROs
is in default of any of their obligations under such contracts,  (d) the License
Agreement  is in full force and effect and neither  HMRI nor TITAN is in default
of any of their  obligations  thereunder,  and (e) subject to  obtaining  HMRI's
prior written consent,  TITAN has the legal power,  right and authority to enter
into this Sublicense Agreement. NOVARTIS represents and warrants that it has the
legal power, right and authority to enter into this Sublicense Agreement.  TITAN
will obtain all  assignments  or licenses from the patent holder of the PATENTS,
to the same extent as TITAN is entitled to receive such  assignments or licenses
from HMRI under the License Agreement,  to provide NOVARTIS with the same degree
of exclusivity


                                      -60-
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                                                                    CONFIDENTIAL

in the TERRITORY under the PATENTS as TITAN is granted by HMRI under the License
Agreement.

                  12.2 Nothing in this  Sublicense  Agreement shall be construed
as a warranty that PATENTS are valid or  enforceable or that their exercise does
not infringe any patent rights of THIRD  PARTIES.  TITAN hereby  represents  and
warrants  that it has no  present  knowledge  that (i)  PATENTS  are  invalid or
unenforceable, (ii) the exercise of PATENTS infringes any patent rights of THIRD
PARTIES,  and (iii) THIRD PARTY  licenses  are  necessary  for the  development,
manufacture or commercialization of COMPOUND or PRODUCT. A holding of invalidity
or  unenforceability  of any PATENT,  from which no further  appeal is or can be
taken, shall not affect any obligation already accrued hereunder, but shall only
eliminate  future  royalties  otherwise due under such PATENT from the date such
holding becomes final.

                  12.3  Each  party  represents  to  the  other  that  it is not
currently  debarred,  suspended  or  otherwise  excluded by any U.S.  Government
agencies from receiving federal contracts.

                  12.4 NOVARTIS  agrees that during the term of this  Sublicense
Agreement,  neither it or a SUBLICENSEE shall license,  develop, have developed,
manufacture, have manufactured, sell or have sold any of the following compounds
or  products  classified  as  an  atypical   antipsychotic:   (i.e.  Olanzapine,
Sertindole, Seroquel, Ziprasadone,  Risperidone); provided that such restriction
shall not apply  within the EEA.  In the event that  NOVARTIS  or a  SUBLICENSEE
undertakes  any of the  foregoing  actions  within  the EEA,  then TITAN may not
terminate this  Sublicense  Agreement or seek damages or equitable  remedies for
such  actions,  but may at its option by notice to NOVARTIS  (i)  terminate  the
EXCLUSIVE nature of the licenses granted pursuant to Article 2


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                                                                    CONFIDENTIAL

hereof  in the EEA,  so that all use of  PATENTS  and  KNOW-HOW  in the EEA will
thereafter be on a nonexclusive basis at a reduced royalty rate to be negotiated
at such time of change in  exclusivity;  (ii) cease  providing  improvements  to
NOVARTIS  pursuant to Section  2.3;  and/or (iii)  require  NOVARTIS to prove to
TITAN's  reasonable  satisfaction  that the  KNOW-HOW is not being used for such
activities.

                  Notwithstanding  the foregoing,  TITAN and NOVARTIS agree that
in the event  NOVARTIS  acquires  rights to one or more of the five compounds or
products  listed in the first  paragraph  of this  Section  12.4 (the  "Acquired
Compounds  or  Products")  as  part  of  a  corporate  transaction  such  as  an
acquisition of assets or stock, a merger, or consolidation,  TITAN shall use its
good faith  efforts to cause HMRI to waive any rights  that it may have  against
NOVARTIS  or TITAN  under this  Section  12.4 and  Section  12.4 of the  License
Agreement.  To assist TITAN in obtaining  such waiver from HMRI,  NOVARTIS  will
provide TITAN with arguments  supporting how NOVARTIS intends to prevent PRODUCT
from being  negatively  impacted by the Acquired  Compounds or Products.  In the
event HMRI will not waive such rights and NOVARTIS  does not agree to divest the
Acquired  Compounds  or  Products  or,  alternatively,  sublicense  PRODUCT to a
mutually  acceptable  third party (which third party must also be  acceptable to
HMRI), TITAN agrees that its sole and exclusive remedy against NOVARTIS shall be
to terminate  the  exclusive  nature of the  Sublicense  Agreement in the EEA as
provided for in this Section 12.4,  and to terminate this  Sublicense  Agreement
elsewhere in the TERRITORY.

                  12.5 NOVARTIS shall indemnify, defend and hold TITAN, HMRI and
their respective  AFFILIATES  harmless from and against any and all liabilities,
claims, demands,


                                      -62-
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                                                                    CONFIDENTIAL

damages, costs, expenses,  fines, penalties or money judgments including without
limitation court costs and reasonable  attorney's fees (hereinafter  referred to
as  "Liabilities"),  during the term of this Sublicense  Agreement and after its
expiration or termination, incurred by or rendered against TITAN, HMRI and their
respective  AFFILIATES which arise out of the clinical testing, use or labeling,
or the manufacture,  processing,  packaging, sale or distribution of COMPOUND or
PRODUCT (as the case may be) by NOVARTIS,  its AFFILIATES and  SUBLICENSEES,  or
the  breach  of  this  Sublicense   Agreement  by  NOVARTIS  (including  without
limitation any breach of NOVARTIS'  representations  and  warranties  under this
Sublicense  Agreement)  or any  negligence or misconduct of NOVARTIS , except to
the extent that such Liabilities are directly attributable to the breach of this
Sublicense  Agreement  by TITAN  or  breach  of the  License  Agreement  by HMRI
(including  without   limitation  any  breach  of  TITAN's   representations  or
warranties   under   this   Sublicense   Agreement   or  any  breach  of  HMRI's
representations  or warranties under the License Agreement) or any negligence or
misconduct  by TITAN or HMRI.  NOVARTIS  shall also  indemnify,  defend and hold
TITAN,  HMRI and their respective  AFFILIATES  harmless from and against any and
all Liabilities incurred by or rendered against TITAN, HMRI and their respective
AFFILIATES  which arise out of the  COMPOUND or PRODUCT  supplied by NOVARTIS to
HMRI and/or TITAN and for use pursuant to Section 2.3, or which arise out of any
contracts or arrangements  with THIRD PARTIES  (including  CROs) relating to the
development  and/or  registration  process for the  COMPOUND or PRODUCT from and
after the effective date of this Sublicense Agreement, whether such contracts or
arrangements  with THIRD  PARTIES were  entered  into prior to or following  the
effective date of this Sublicense Agreement, except to the extent that


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                                                                    CONFIDENTIAL

such  Liabilities  are directly  attributable  to the breach of this  Sublicense
Agreement by TITAN or breach of the License Agreement by HMRI (including without
limitation  any  breach of  TITAN's  representations  or  warranties  under this
Sublicense Agreement or any breach of HMRI's representations or warranties under
the License Agreement) or any negligence or misconduct by TITAN or HMRI.

                  12.6 TITAN  shall  indemnify,  defend and hold  NOVARTIS , its
AFFILIATES and  SUBLICENSEES  harmless from and against any and all  Liabilities
(as defined in Section 12.5 hereof),  incurred by or rendered against  NOVARTIS,
its  AFFILIATES  and  SUBLICENSEES,  which  arise  out of  the  breach  of  this
Sublicense  Agreement  by TITAN  (including  without  limitation  any  breach of
TITAN's  representations or warranties under this Sublicense Agreement),  or any
negligence or misconduct  by TITAN,  except to the extent that such  Liabilities
are directly attributable to the breach of this Sublicense Agreement by NOVARTIS
(including  without  limitation  any  breach of  NOVARTIS'  representations  and
warranties under this Sublicense Agreement),  or any negligence or misconduct by
NOVARTIS.  TITAN shall also indemnify,  defend and hold NOVARTIS, its AFFILIATES
and SUBLICENSEES  harmless from and against any and all Liabilities  incurred by
or rendered against  NOVARTIS,  and its AFFILIATES and SUBLICENSEES  which arise
out of the  manufacture,  use or sale of  COMPOUND  and  PRODUCT  that  has been
manufactured or sold by or on behalf of TITAN and its AFFILIATES or SUBLICENSEES
in Japan or those  countries where NOVARTIS'  sublicense  rights  hereunder have
been terminated (including the clinical testing, use and labeling of PRODUCT and
the manufacture, processing, packaging, sale or distribution of PRODUCT by TITAN
and its AFFILIATES and SUBLICENSEES) or subject to


                                      -64-
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                                                                    CONFIDENTIAL

Section  5.4(b),  which arise out of the  activities  of any CRO which  occurred
prior to the execution of this  Sublicense  Agreement  and that were  undertaken
pursuant to a written  contract  between TITAN and such CRO relating to COMPOUND
or PRODUCT.

                  12.7 Each party shall give the other prompt  notice in writing
of any claim or demand  referred to in Sections 12.5 or 12.6.  In addition,  the
obligations of any indemnifying  party shall be subject to the indemnified party
fulfilling the following obligations:

                           (a) With respect to third party  claims,  indemnified
party shall fully cooperate with the  indemnifying  party in the defense of such
claim or demand which defense shall be controlled by the indemnifying party; and

                           (b) With respect to third party  claims,  indemnified
party shall not, except at its own cost,  voluntarily  make any payment or incur
any  expense  with  respect  to any  claim,  demand or suit  (including  without
limitation  retaining its own counsel)  without the prior written consent of the
indemnifying party, which such party shall not be required to give.

         13. FORCE MAJEURE.

                  13.1  If  the  performance  of any  part  of  this  Sublicense
Agreement by either party, or if any obligation under this Sublicense Agreement,
is  prevented,  restricted,  interfered  with or  delayed by reason of any cause
beyond the  reasonable  control of the party  required to perform,  the party so
affected,  upon giving written notice and written evidence of such force majeure
to the other party, shall be excused from such performance to the extent of such
prevention, restriction, interference or delay, provided that the affected party
shall use its  reasonable  commercial  efforts to avoid or remove such causes of
nonperformance and shall continue performance with the utmost


                                      -65-
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                                                                    CONFIDENTIAL

dispatch whenever the force majeure is removed. In the event of a force majeure,
the  parties  shall  also  discuss  whether  modification  of the  terms of this
Sublicense  Agreement  are necessary to alleviate the hardship or loss caused by
the force majeure.

         14. GOVERNING LAW AND ARBITRATION.

                  14.1 This  Sublicense  Agreement  shall be deemed to have been
made in the State of New York and its form,  execution,  validity,  construction
and effect shall be determined  in accordance  with the laws of the State of New
York  (without  regard to New York's or any other  jurisdiction's  choice of law
principles).

                  14.2 In the event of any  controversy  or claim arising out of
or relating to any provision of this Sublicense Agreement, the parties shall try
to settle their differences amicably between themselves. Any unresolved disputes
arising between the parties  relating to, arising out of or in any way connected
with  this  Sublicense  Agreement  or  any  term  or  condition  hereof,  or the
performance  by either party of its  obligations  hereunder,  whether  before or
after termination of this Sublicense  Agreement,  shall be resolved by final and
binding  arbitration.  Whenever a party shall  decide to  institute  arbitration
proceedings,  it shall give  written  notice to that effect to the other  party.
Except in the case of a  determination  to be made where payments are to be made
to by one party to the other,  the party giving such notice  shall  refrain from
instituting  the  arbitration  proceedings  for a  period  of  sixty  (60)  days
following such notice to allow the parties time to further attempt to come to an
amicable resolution of the dispute.  Arbitration shall be held in New York City,
New  York  according  to  the  commercial  rules  of  the  American  Arbitration
Association  ("AAA").  The  arbitration  will be  conducted  by a panel of three
arbitrators appointed in accordance with AAA


                                      -66-
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                                                                    CONFIDENTIAL

rules;  provided,  however,  that each party shall within thirty (30) days after
the institution of the arbitration  proceedings appoint a party arbitrator,  and
the party-arbitrators  shall select a neutral arbitrator,  to be chairman of the
arbitration panel, within thirty (30) days thereafter.  If the party-arbitrators
are  unable  to  select a neutral  within  such  period,  the  neutral  shall be
appointed in accordance with AAA rules.  All  arbitrator(s)  eligible to conduct
the arbitration must agree to render their opinion(s) within thirty (30) days of
the final  arbitration  hearing.  No arbitrator  (nor the panel of  arbitrators)
shall have the power to award punitive  damages under this Sublicense  Agreement
and such award is expressly prohibited.  Decisions of the arbitrator(s) shall be
final and binding on all of the  parties.  Judgment on the award so rendered may
be entered in a court having jurisdiction  thereof. In any arbitration  pursuant
to this Sublicense Agreement,  the arbitrators shall interpret the express terms
hereof  and apply the laws of the State of New  York.  The  losing  party to the
arbitration as determined by the arbitrators shall pay the costs of arbitration.

         15. SEPARABILITY.

                  15.1 In the event any portion of this Sublicense Agreement not
material to the remaining  portions shall be held illegal,  void or ineffective,
the remaining portions hereof shall remain in full force and effect.

                  15.2 If any of the  terms  or  provisions  of this  Sublicense
Agreement are in conflict with any applicable  statute or rule of law, then such
terms or  provisions  shall be deemed  inoperative  to the extent  that they may
conflict  therewith  and shall be deemed to be  modified  to  conform  with such
statute or rule of law.


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                  15.3 In the  event  that  the  terms  and  conditions  of this
Sublicense  Agreement  are  materially  altered as a result of Sections  15.1 or
15.2, the parties shall  renegotiate the terms and conditions of this Sublicense
Agreement so as to accomplish  as nearly as possible the original  intentions of
the parties.

         16. ENTIRE AGREEMENT.

                  16.1 This  Sublicense  Agreement and the  Appendices  attached
hereto,  entered  into as of the date  written  above,  constitutes  the  entire
agreement  between  the  parties  relating  to the  subject  matter  hereof  and
supersedes  all  previous   writings  and   understandings,   including  without
limitation the Heads of Agreement between the parties dated October 21, 1997 and
the  Confidentiality  Agreement  between the parties dated February 21, 1997 (it
being understood and agreed that all Confidential  Information of HMRI and TITAN
disclosed to NOVARTIS prior to the effective date of this  Sublicense  Agreement
shall  be  subject  to  Sections  6.4,  6.6,  6.7  and  6.9 of  this  Sublicense
Agreement).  No terms or provisions of this Sublicense Agreement shall be varied
or modified by any prior or  subsequent  statement,  conduct or act of either of
the  parties,  except that the parties may amend this  Sublicense  Agreement  by
written instruments specifically referring to and executed in the same manner as
this Sublicense Agreement.

         17. NOTICES.

                  17.1 Any notice  required or permitted  under this  Sublicense
Agreement  shall be in  writing  and in  English  and shall be sent by  airmail,
postage prepaid,  or facsimile or courier to the following address of each party
or to such other  address  as may be  designated  in  writing by the  respective
parties:


                                      -68-
<PAGE>

                                                                    CONFIDENTIAL

If to NOVARTIS :           Novartis Pharma A.G.
                           Legal Services
                           Lichtstrasse 35
                           CH 4002 Basel
                           Switzerland
                           Attention: General Counsel

With copies to:            Business Development and Licensing
                           Novartis Pharma A.G.
                           Lichtstrasse 35
                           CH 4002 Basel
                           Switzerland
                           Attention:  Head of Department

If to TITAN:               Titan Pharmaceuticals, Inc.
                           400 Oyster Point Blvd., Suite 505
                           South San Francisco, CA 94080
                           Attention: Louis R. Bucalo, M.D.
                                      President & CEO
                           Telephone: (650) 244-4990
                           Facsimile: (650) 244-4956

With copies to:            Titan Pharmaceuticals, Inc.
                           400 Oyster Point Blvd., Suite 505
                           South San Francisco, CA 94080
                           Attention: Sunil R. Bhonsle
                                      Executive V.P. & COO
                           Telephone: (650) 244-4990
                           Facsimile: (650) 244-4956

                           and

                           Heller Ehrman White & McAuliffe
                           525 University Avenue
                           Palo Alto, CA 94301-1900
                           Attention: Neil Flanzraich, Esq.
                           Telephone: (650) 324-7118
                           Facsimile: (650) 324-0638

                  17.2 Any notice  required or permitted to be given  concerning
this  Sublicense  Agreement shall be effective upon receipt by the party to whom
it is addressed.

         18. ASSIGNMENT.


                                      -69-
<PAGE>

                                                                    CONFIDENTIAL

                  18.1 This Sublicense Agreement or any portions thereof and the
sublicenses herein granted shall be binding upon and inure to the benefit of the
successors in interest and assignees of the respective PARTIES.

                  18.2  NOVARTIS  may assign  this  Sublicense  Agreement  to an
AFFILIATE without the prior written consent of TITAN, and in such event NOVARTIS
will continue to guarantee the obligations of such AFFILIATE hereunder.  Subject
to the foregoing,  NOVARTIS  shall not have the right to assign this  Sublicense
Agreement to any THIRD PARTY without the prior written consent of TITAN,  not to
be unreasonably withheld.

                  18.3 In the event of a  consolidation,  merger or  acquisition
which involves a change in the control of NOVARTIS,  this  Sublicense  Agreement
shall  remain in full force and  effect,  and  NOVARTIS  agrees to notify  TITAN
pursuant to Section 10.4.

         19. FAILURE TO ENFORCE.

                  19.1 The  failure  of either  party to enforce at any time any
provisions hereof shall not be construed to be a waiver of such provision nor of
the right of such party thereafter to enforce each and every such provision.

         20. NO AGENCY.

                  20.1  Except  as  expressly  set  forth  in  this   Sublicense
Agreement,  nothing in this Sublicense  Agreement authorizes either party to act
as agent  for the other or, as to any  third  party,  to  indicate  or imply the
existence of any such agency relationship.  The relationship between the parties
is that of independent contractors.

         21. FURTHER ASSURANCES.


                                      -70-
<PAGE>

                                                                    CONFIDENTIAL

                  21.1 Each party  hereto  agrees to  execute,  acknowledge  and
deliver  such  further  instruments,  and to do all such other  acts,  as may be
necessary or  appropriate  in order to carry out the purposes and intent of this
Sublicense Agreement.

         22. CAPTIONS.

                  22.1 Captions are inserted for convenience  only and in no way
are  to  be  construed  to  define,   limit  or  affect  the   construction   or
interpretation hereof.

         23. MISCELLANEOUS.

                  23.1 Both parties agree to discuss  matters arising during the
term of this  Sublicense  Agreement in the spirit of cooperation  and good faith
and endeavor to resolve any differences by mutual agreement  whenever  possible.
If the parties fail to reach  agreement,  either party may submit the matter for
resolution pursuant to Section 14.2.

                  23.2 NOVARTIS  covenants to TITAN that during the term of this
Sublicense  Agreement,  NOVARTIS,  its  AFFILIATES  and  SUBLICENSEES  shall not
violate the Federal  Foreign  Corrupt  Practices Act in the  performance  of its
negotiations or obligations hereunder.

                  23.3 NOVARTIS  acknowledges  that it has received and reviewed
the License  Agreement  (a copy of which is attached  hereto as Appendix G), and
agrees  that the terms  and  conditions  of this  Sublicense  Agreement  must be
consistent with the License Agreement.


                                      -71-
<PAGE>

         IN WITNESS WHEREOF,  the parties,  through their  authorized  officers,
have executed this Sublicense Agreement as of the date first written above.

NOVARTIS PHARMA A.G.                                TITAN PHARMACEUTICALS, INC.

By:                                                 By:
Name:                                               Name:
Title:                                              Title:

NOVARTIS PHARMA A.G.

By:
Name:
Title:


                                      -72-
<PAGE>

                                                                    CONFIDENTIAL

                                   APPENDIX A
               PATENTS AND PATENT APPLICATIONS (PER SECTION 1.17)

<TABLE>
<CAPTION>
                     PATENT           FILING                                       PATENT           ISSUE        EXPIRATION
     COUNTRY       APPL. NO.           DATE           TYPE           STATUS         NO.             DATE            DATE
     -------       ---------           ----           ----           ------         ---             ----            ----
<S>                <C>                 <C>           <C>            <C>           <C>              <C>            <C>        
US                 07/354,411          5/19/89                      abandoned                  
US                 07/456,790         12/29/89         CIP+         abandoned                

  EP               90109208.0         05/16/90                       granted      0 402 644        08/16/95       05/15/2010
  Austria          90109208.0         05/16/90       national       converted     E 126512         08/16/95       05/15/2010
  Belgium          90109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Denmark          90109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  France           90109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Germany          90109208.0         05/16/90       national       converted     69021645.9       08/16/95       05/15/2010
  Great Britain    90109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Greece           90109208.0         05/16/90       national       converted     3017447          08/16/95       05/15/2010
  Israel           94425              05/17/90                        issued      P/94425          05/29/94       05/17/2010
  Italy            90109208.0         05/16/90       national       converted     52158/BE/95      08/16/95       05/15/2010
  Luxembourg       90109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Netherlands      09109208.0         05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Spain            09109208.0         05/16/90       national       converted     ES2076253T3      08/16/95       05/15/2010
  Switzerland      0909208.0          05/16/90       national       converted     0 402 644        08/16/95       05/15/2010
  Sweden           0909208.0          05/16/90       national       converted     0 402 644        08/16/95       05/15/2010

  Australia        55770/90           05/22/90                        issued      640,653          09/02/93       05/22/2010
  Canada           2,017,193-6        05/18/90
  China            90103721.4         05/19/90
  Czech            2425-90            05/17/90
  Republic
  Finland          902449             05/17/90
  Hungary          3090/90            05/18/90
  Ireland          1809/90            05/18/90                        issued      68431            05/23/96       05/18/2010
  Israel           94425              05/17/90
  Korea            90/7102            05/18/90
</TABLE>


                                      -73-
<PAGE>

                                                                    CONFIDENTIAL
<TABLE>
<CAPTION>
                     PATENT           FILING                                       PATENT           ISSUE        EXPIRATION
     COUNTRY       APPL. NO.           DATE           TYPE           STATUS         NO.             DATE            DATE
     -------       ---------           ----           ----           ------         ---             ----            ----
<S>                <C>                 <C>           <C>            <C>           <C>              <C>            <C>        
  Mexico           20787              05/18/90
  New Zealand      233710             05/17/90                        issued      233710
  Norway           P902214            05/18/90                                    177301           08/23/95        05/18/201
  Philippines      40530              05/17/90
  Poland           P-285247           05/18/90                                    163965           12/09/93
  Portugal         94084              05/18/90                        issued      94084            09/18/96        05/18/201
  Russia           4743876/04         05/18/90
  South            90/2820            05/18/90                        issued      90/38230         02/27/91       05/18/2010
  Taiwan           79104996           06/19/90                        issued      54190            01/11/92       06/19/2010

US                 07/619,825         11/29/90     continuation     abandoned
US                 07/944,705         09/05/91     continuation     abandoned
US                 07/788,269         11/05/91         CIP          abandoned
US                 07/969,383         10/30/92         CIP            issued      5,364,866        11/15/94       11/15/2011
  PCT              92/09276           11/04/92                     WO/93/09102

  EP               92/924151.1        11/04/92                       pending

  EP (Portugal)    92118982.5         11/05/92                       pending
  Australia        30570/92           11/04/92
  Belarus          1715               11/04/92
  Canada           2,121,253          11/04/92
  Czech            PV 1102-94         11/04/92
  Republic

  Finland          942052             11/04/92
  Georgia          001977             11/04/92
  Hungary          P9401316           11/04/92
  Israel           103622             11/03/92
  Korea            94-701524          11/04/92
  Kazakhstan       941593.1           11/04/92
  Mexico           926370             11/05/92
  Norway           941647             11/04/92
  New              245006             11/03/92                        issued      245006           05/17/96       11/03/2012
</TABLE>


                                      -74-
<PAGE>

                                                                    CONFIDENTIAL
<TABLE>
<CAPTION>
                     PATENT           FILING                                       PATENT           ISSUE        EXPIRATION
     COUNTRY       APPL. NO.           DATE           TYPE           STATUS         NO.             DATE            DATE
     -------       ---------           ----           ----           ------         ---             ----            ----
<S>                <C>                 <C>           <C>            <C>           <C>              <C>            <C>        
  Philippines      45259              11/12/92
  Poland           P-303452           11/04/92
  Romania          9400761            11/04/92
  Russia           94028105.04        11/04/92
  Slovak           PV 0456-94         11/04/92
  Republic
  Taiwan           81108831           11/05/92
  Uzbekistan       9500706.1          11/04/92

US                 08/144,265         10/28/93         CIP          abandoned
US                 08/309,395         09/20/94        CIP**          pending
US                 08/329,000*        10/25/94        CIP**           issued      5,658,911        08/19/97       08/19/2014
US                 08/468,611         06/06/95        DIV**          pending
  PCT              94/12054           10/27/94                      WO95/11680
   EP              9590039.6          10/27/94                       pending
   Brazil          PI 1101001.0       05/14/97       Pipeline
   Canada          2175212            10/27/94
   China           94194302           10/27/94
   Czech           PV 1238-96         10/27/94
   Republic
   Hungary         P/P 00576          06/29/95                       granted      211,853          11/06/95       06/29/2015
   Indonesia       951058             06/08/95
   Israel          111,498            10/27/94
   Korea           96-702162          10/27/94
   Mexico          94 8405            10/27/94
   Norway          p961686            10/27/94
   New             275941             10/27/94
   Zealand
   Poland          P314135            10/27/94
   Romania         96-00888           10/27/94
   Russia          96110214           10/27/94
   Taiwan          83110396           11/10/94
</TABLE>


                                      -75-
<PAGE>

                                                                    CONFIDENTIAL
<TABLE>
<CAPTION>
                     PATENT           FILING                                       PATENT           ISSUE        EXPIRATION
     COUNTRY       APPL. NO.           DATE           TYPE           STATUS         NO.             DATE            DATE
     -------       ---------           ----           ----           ------         ---             ----            ----
<S>                <C>                 <C>           <C>            <C>           <C>              <C>            <C>        
   South           95/2653            10/28/94
   Africa
</TABLE>

*  subject to a 60 way restriction requirement; 329,000 survived as one to the 
   60 divisionals 
** pending as one of the 60 divisionals 
+  CIP (Continuation-in-part)


                                      -76-
<PAGE>

                                                                    CONFIDENTIAL

APPENDIX B

MAJOR METABOLITES (PER SECTION 1.6)

- --------------------------------------------------------------------------------
Compound No.          Name                      R1          R2           R3
- --------------------------------------------------------------------------------
rP88 8991      4-[3-[4-(6-fluoro-1,2-          H          CH(OH)CH3      OCH
               benzisoxazol-3-yl)-1-                                      3
               piperidinyl]propoxy]-3-
               methoxy-[alpha]-methyl-
               benzenemethanol

P89 9124       1-[4-[3-[4-(6-fluoro-1,2-       H          C(O)CH3        OH
               benzisoxazol-3-yl)-1-
               piperidinyl]propoxy]-3-
               hydroxyphenyl]-ethanone

P94 11840      1-[4-[3-[4-(6-fluoro-1,2-       H         C(O)CH2OH      OCH
               benzisoxazol-3-yl)-1-                                     3
               piperidinyl]propoxy]-3-
               methoxyphenyl]-2-
               hydroxyethanone

P89 9430       4-[3-[4-(6-fluoro-1,2-          H         CH(OH)CH3       OH
               benzisoxazol-3-yl)-1-
               piperidinyl]propoxy]-3-
               hydroxy-[alpha]-
               methylbenzenemethanol

P94 11677      4-[3-[4-(6-fluoro-1,2-          OH        CH(OH)CH3     OCH
               benzisoxazol-3-yl)-1-                                    3
               piperidinyl]propoxy]-2-
               hydroxy-5-methoxy-[alpha]-
               methylbenzenemethanol


                                      -77-
<PAGE>

                                                                    CONFIDENTIAL

- --------------------------------------------------------------------------------
Compound No.           Name                    R1          R2         R3
- --------------------------------------------------------------------------------
P94 11679      1-[4-[3-[4-(6-fluoro-1,2-       OH        C(O)CH3     OCH
               benzisoxazol-3-yl)-1-                                  3
               piperidinyl]propoxy]-2-
               hydroxy-5-
               methoxyphenyl]ethanone

P94 11702      1-[4-[3-[4-(6-fluoro-1,2-       OH        C(O)CH3     OH
               benzisoxazol-3-yl)-1-
               piperidinyl]propoxy]-2,5-
               dihydroxyphenyl]-ethanone


                                      -78-
<PAGE>

                                                                    CONFIDENTIAL

                                   APPENDIX D

                                 Sample Invoice
                           TITAN PHARMACEUTICALS, INC.

[Date]

Novartis Pharma AG
Zentraler Faktureneingang
Attn:  Ms. M. Gnehm
BD&L Contract Administration
Lichstrasse 35
CH 4002 Basel
Switzerland

Dear Ms. Gnehm:

Re:   Titan Pharmaceuticals, Inc./Sublicense Agreement - Iloperidone

This is an invoice  requesting  payment in connection  with the  above-captioned
agreement between Titan Pharmaceuticals, Inc. and Novartis Pharma AG.

Novartis Contract Code No.:      [will be assigned by BD&L following execution]

Novartis Creditor No.:           [will be assigned by BD&L following execution]

Reason for Payment:              [please cite specific section or article in the
                                 agreement]

Amount and Currency:             [self-explanatory]

Bank Address and Account No.:    [insert the name and address of the bank to 
                                 which the payment should be sent and the 
                                 account number to which it should be credited]

Sincerely yours,


                                      -79-
<PAGE>

                                                                    CONFIDENTIAL

                                   APPENDIX E
                   TITAN CONTRACTS WITH RESEARCH ORGANIZATIONS

IBAH, Inc.        CLINICAL AND PHARMACEUTICS SERVICES MASTER
                  AGREEMENT AND ITS ENABLING EXHIBITS 1 THROUGH 8

            EXHIBIT 1.     ILOPERIDONE STUDY 300
            EXHIBIT 2.     ILOPERIDONE STUDY 302
            EXHIBIT 3.     ILOPERIDONE STUDY 306
            EXHIBIT 4.     RECEIPT AND STORAGE OF CLINICAL MATERIAL FOR
                           ILOPERIDONE CLINICAL STUDIES
            EXHIBIT 5.     ILOPERIDONE CLINICAL STABILITY PROGRAM
            EXHIBIT 6.     CLINICAL SUPPLY MATERIAL HANDLING OF ILOPERIDONE
            EXHIBIT 7.     ENCAPSULATION OF HALOPERIDOL TABLETS
            EXHIBIT 8.     ANALYTICAL TESTING TO EXTEND EXPIRATION DATES;
                           ANALYTICAL TESTING OF 40C/75RH SAMPLES; DESTRUCTION
                           OF RISPERIDONE, RESPERIDAL, AND HALOPERIDOL
                           SUPPLIES; DOCUMENTATION SUPPORT FOR IND FILING

      (copies of exhibits will be provided by TITAN to NOVARTIS separately)

WIL RESEARCH LABORATORIES                      COMPLETION OF RODENT ONCOGENICITY

                                               STUDIES


                                      -80-
<PAGE>

                                                                    CONFIDENTIAL

              A 24-MONTH ORAL ONCOGENICITY STUDY OF HP-873 IN MICE
              A 24-MONTH ORAL ONCOGENICITY STUDY OF HP-873 IN RATS

      (RESPONSIBILITY FOR THESE STUDIES WAS TRANSFERRED FROM HMRI TO TITAN)


                                      -81-
<PAGE>

                                                                    CONFIDENTIAL

                                   APPENDIX F

                    SPECIAL COUNTRIES IN TERRITORY REGARDING
                   HMRI'S PATENT PROTECTION (PER SECTION 8.2)

    United States

PCT                                             PCT (cont.)                     
    Australia                                       Estonia  
    Brazil                                          Hungary         
    Bulgari                                         Israel          
    Canada                                          Mexico          
    China                                           New Zealand     
    Czech Republic                                  Norway                     
    Kazakhstan                                      Poland          
    EPO                                             Russian         
      Austria                                       Slovakia        
      Belgium                                       South Korea     
      Denmark                                   Non-PCT             
      Finland                                       Argentina             
      France                                        Chile           
      Germany                                       Egypt           
      Great Britain                                 Hong Kong       
      Greece                                        India           
      Iceland                                       Indonesia       
      Ireland                                       Malaysia        
      Italy                                         Philippines     
      Latvia                                        Saudi Arabia    
      Lithuania                                     South Africa    
      Luxembourg                                    Taiwan          
      Monaco                                        Thailand        
      Netherlands                               Venezuela           
      Portugal                                                      
      Romania                                              
      Singapore                                                    
      Slovenia                                  
      Spain
      Sweden
      Switzerland with Liechtenstein
      Turkey
      Ukraine


                                      -82-



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