COMBICHEM INC
10-K405, 1999-03-31
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                   FORM 10-K
                            ------------------------
 
[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
     THE SECURITIES EXCHANGE ACT OF 1934
 
                    FOR FISCAL YEAR ENDED DECEMBER 31, 1998
                                       OR
 
[ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF
     THE SECURITIES EXCHANGE ACT OF 1934
                               (NO FEE REQUIRED)
 
                        COMMISSION FILE NUMBER: 00-23473
 
                                COMBICHEM, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                       <C>
                DELAWARE                                 33-0617379
      (STATE OR OTHER JURISDICTION                    (I.R.S. EMPLOYER
    OR INCORPORATION OR ORGANIZATION)                IDENTIFICATION NO.)
          9050 CAMINO SANTA FE
       SAN DIEGO, CALIFORNIA 92121                          92121
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                 (ZIP CODE)
</TABLE>
 
              REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE:
                                  619-530-0484
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                      NONE
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                         COMMON STOCK, PAR VALUE $0.001
 
     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]
 
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.  [X]
 
     The aggregate market value of the voting stock held by nonaffiliates of the
registrant as of February 28, 1999 was approximately $28,048,947. For the
purposes of this calculation, shares owned by officers, directors and 10%
shareholders known to the registrant have been deemed to be owned by affiliates.
This determination of affiliate status is not necessarily a conclusive
determination for other purposes.
 
     The number of shares outstanding of the registrant's Common Stock as of
February 28, 1999 was 13,440,421.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Portions of Registrant's Proxy Statement for the Annual Meeting of
Shareholders scheduled to be held on May 6, 1999, to be filed on or about April
6, 1999, referred to herein as the "Proxy Statement", are incorporated as
provided in Part III.
 
     Certain exhibits filed with the Registrant's prior registration statements
and Forms 10-Q are incorporated as provided in Part IV.
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                                     PART I
 
ITEM 1. BUSINESS
 
OVERVIEW
 
     CombiChem is a computational product discovery company that is applying its
proprietary design technology and rapid synthesis capabilities to accelerate the
discovery process for new drugs and chemical products. We believe our approach
offers pharmaceutical and chemical companies the opportunity to conduct their
discovery efforts in a more productive and cost-effective manner. Using our
proprietary Discovery Engine(TM) process, we focus on the generation, evolution
and optimization of potential new lead candidates for our collaborative partners
who will then develop, manufacture, market and sell any resulting products. We
believe that our process is widely applicable to a variety of disease targets
and therapeutic indications as well as to other industries such as agrochemical,
industrial chemical and materials science. To date, we have established
collaborative agreements with Athena Neurosciences, Inc., a wholly owned
subsidiary of Elan Corporation, plc, ICOS Corporation, ImClone Systems
Incorporated, Novartis Crop Protection AG, Ono Pharmaceutical Co., Ltd., Roche
Bioscience, a division of Syntex (U.S.A.) Inc., Sumitomo Pharmaceuticals Co.,
Ltd. and Teijin Limited. In addition, we are using our approach on internal
programs to discover new lead candidates that will then be outlicensed to third
parties, while retaining a larger economic interest. In December 1998, we
further broadened the application of the technology by establishing a joint
venture with Chirotech Technology, Ltd., a member of the Chiroscience Group of
companies, to commercialize libraries of chiral compounds. The joint venture,
ChiroChem Discovery Services, LLC, was established to develop and sell
specifically designed chiral compound libraries.
 
  Industry Background
 
     During the past decade, significant advances in life sciences research and
the increasing appreciation of the complexity of biological processes have
highlighted the productivity limitations of traditional approaches to drug
discovery. These limitations, together with increased competition in the
pharmaceutical and biotechnology industries, have created intense pressure on
companies involved with drug development to reconsider the allocation of their
research budgets and to improve the cost-effectiveness of their drug discovery
process.
 
     Between 1976 and 1996, the number of new chemical entities approved by the
FDA remained relatively constant, ranging between 12 to 30 per year, despite a
more than 10-fold increase in research and development spending by
pharmaceutical and biotechnology companies. Furthermore, it typically takes 12
to 15 years from the original concept of affecting the activity of a particular
biological target to the market introduction of a drug that performs such a
function. The average cost of bringing a new drug to market has been estimated
to be in excess of $300 million.
 
     Frustrated with the inefficiencies of traditional drug discovery
approaches, pharmaceutical and biotechnology companies are beginning to embrace
new enabling technologies, such as combinatorial chemistry, genomics,
structure-based drug design, high-throughput screening and information
technologies, in order to gain a competitive advantage by accelerating the time
to develop and commercialize new compounds. These technologies also have the
potential to reduce significantly the cost associated with drug discovery.
 
  The Traditional Drug Discovery Process and its Limitations
 
     The traditional path to discovering a new drug typically begins with the
identification of one or more biological targets that are believed to affect a
disease state. A biological test or assay based on a target is then developed,
predicated on the scientific belief that a compound binding with this target may
have a therapeutic benefit with respect to the disease under study. Such an
assay facilitates the screening (testing to determine which of the compounds
have the desired activity against the target) of a collection of hundreds to
thousands of candidate compounds, typically contained in a library, that have
been synthesized in the laboratory. Compounds that bind to the target protein
and modulate its activity are referred to as hits. Medicinal chemists optimize
these hits until they have sufficient potency to become lead candidates and then
improve their preclinical characteristics (such as potency, specificity and in
vivo profile) further with the goal of producing drug development candidates.
 
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     In summary, the traditional drug discovery process consists of the
following steps:
                                    [CHART]
 
     The traditional drug discovery process is extremely expensive, inefficient
and unreliable. Failure at any point during this discovery process would
typically force the scientist either to abandon the project or to return to the
initial starting point and repeat the process. As a result, the discovery of a
new drug for a specified target can take years or can fail entirely.
 
     In recent years, the advent of robotic high-throughput screening and
automated synthesis technologies, such as combinatorial chemistry and parallel
synthesis, has begun to relieve one apparent bottleneck involving screening,
synthesis and purification of compounds in the library. While these technologies
facilitate the mechanics of drug discovery, they address neither the
unreliability of the process nor its principal inefficiency: the number of
iterations required to find a lead candidate. To address these problems, a novel
approach is needed that can provide information to improve the selection of each
subsequent library of compounds to synthesize, potentially reducing the number
of iterations. Only by improving the processes of data analysis and compound
selection can a laborious, iterative procedure be forced to converge on the lead
candidates with the most desirable pharmacological profiles.
 
  Current Combinatorial Chemistry and Computational Approaches and Their
Limitations
 
     Combinatorial chemistry involves the rapid creation of large collections of
chemical compounds for the purpose of identifying hits through random screening.
Combinatorial chemistry has made possible the synthesis of thousands or even
millions of molecules in a short period of time. The traditional approach
involved synthesizing only one molecule at a time. Over the last decade, the
field of combinatorial chemistry has evolved from only companies that design and
synthesize molecules to include those that develop software and automation to
facilitate design and synthesis. These companies tend to use highly varied
approaches, including: focusing on single, pure compounds versus making
mixtures; building large versus small, focused libraries; automating part versus
all of the process; and using or not using medicinal chemistry as a principal
guiding force.
 
     Computational methods are also employed in drug discovery. These methods
involve the use of computer-based and information technologies to manage large
chemical databases, to examine X-ray crystal structures of the target when
available (structure-based drug design), to operate the assorted automated
devices available for the synthesis of libraries, to determine how changes in
the structure affect the activity of a molecule (SAR activity) and to generate
"virtual libraries" using chemical building blocks from readily available
sources.
 
     Currently, the dominant method of pursuing drug discovery focuses on
screening large libraries to search for a lead candidate directly in the
library, or at least a hit, which can then be optimized by the more traditional
techniques of medicinal chemistry to generate a development candidate. We
believe this brute-force, trial-and-error approach is flawed because limited or
no information is factored into the library design to force the iterative drug
discovery process to converge. This limitation in current combinatorial
chemistry approaches is underscored by the fact that most compound libraries
used for screening have been constructed with the sole objective of isolating a
development candidate with the highest binding affinity to a target. In order to
achieve this objective against all possible targets, it is believed such
libraries would have to contain in excess of 100 million compounds. A library of
that size is well beyond current synthesis capabilities. In addition, the
challenge of drug discovery is not only to find a lead candidate that exhibits
activity against a biological target. It is also important to ensure that the
lead candidate will have characteristics that will enable it to overcome the
more difficult in vivo hurdles of toxicity, metabolism or problems with oral
administration, none of which will become evident until early testing. Unless
information can be extracted about which characteristics are most necessary for
binding, it is difficult to know how to modify a compound to maintain tight
binding affinity
 
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while overcoming these hurdles. Furthermore, if no hits are found after the
screening of a traditional combinatorial library, a scientist has no starting
point for the drug discovery process.
 
     While both combinatorial chemistry and computational approaches are useful
in drug discovery to some degree, they are severely taxed by the complexity of
properly using the information available for library design, as evidenced by the
following drawbacks: (1) the inability to derive and integrate information both
from compounds that are active and those that are inactive against the target;
(2) the inability to probe the target in order to compute ways of improving the
predictive models or hypotheses; and (3) the inability to handle the dual
requirements of speed and quality when large data sets must be analyzed. We
believe that these drawbacks constitute fundamental reasons that current
discovery approaches have been only moderately successful in generating lead
candidates and development candidates, despite the large number of initial hits.
 
  CombiChem's Solution and Advantages
 
     We believe that we offer a solution to drug discovery by combining our
proprietary design technology and rapid synthesis capabilities in a unique way.
Our convergent, iterative process for drug discovery -- our Discovery Engine
(see the following diagram) -- is based on compound libraries designed for
information.
 
     The design of libraries for information involves the selection of compounds
that collectively probe the biological target in a systematic way to determine
the chemical characteristics required for binding to such target. By identifying
features that discriminate between active and inactive compounds, predictive
models, called hypotheses, are constructed and then used to select a more
focused library of compounds. The compounds are chosen from our proprietary
Virtual Library, a computational representation of a very large number of
potential molecules chosen for ease of laboratory synthesis. We believe that by
repeating this process of selecting, synthesizing and screening informative
compounds and analyzing the resulting data, the Discovery Engine process quickly
converges on the most predictive hypothesis. This hypothesis describes the
characteristics a compound must possess to be active against the target and,
thus, is used to select a variety of potent lead candidates.
 
     Each cycle of the Discovery Engine refines the definition of the best
hypothesis for the target in question. After several cycles, the resulting
hypothesis can be used to design highly potent compounds from a broad range of
chemical classes including those not readily amenable to combinatorial synthesis
techniques. By facilitating the design of a variety of potent compounds for
preclinical testing, the Discovery Engine has the potential to increase greatly
the likelihood that at least one of these compounds passes the significant
downstream hurdles and eventually becomes a commercial drug.
 
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                                   [DIAGRAM]
 
     We believe that the advantages of our Discovery Engine include the
following:
 
     - Generating lead candidates from multiple structural series that exhibit
       the same biological activity. By using predictive hypotheses to search
       the Virtual Library, multiple structural series of compounds that have
       the same effect on the target can be identified. The availability of
       multiple structural series increases the likelihood that at least one of
       these molecules will overcome the in vivo hurdles in preclinical
       development. In addition, this provides an opportunity for us and our
       collaborators to enhance the intellectual property position that
       potentially can be developed around these compounds by having more than
       one patentable structural series.
 
     - Generating lead structures against a wide range of targets including
       those for which little or no information is available. The Universal
       Informer Library consists of a computer-designed, proprietary collection
       of approximately 13,000 physical compounds that can be screened against
       targets where little or no information is available about the molecular
       structures that may be active against those targets. Once the Universal
       Informer Library is screened, the information obtained is used to start
       the Discovery Engine process. In addition, because the Discovery Engine
       is not dependent on having prior knowledge about the target (for
       instance, an X-ray crystal structure representative of the target), it
       can potentially be used to discover drugs against any target.
 
     - Achieving rapid generation, evolution and optimization of lead
       candidates. By combining flexible design technology and rapid synthesis,
       our Discovery Engine can produce lead candidates for any of the three
       types of drug discovery programs -- lead generation, lead evolution or
       lead optimization -- with less than two years of effort.
 
     - Reducing synthesis and screening costs. Our design technology facilitates
       the use of small, informative libraries. Use of these small libraries
       decreases the costs associated with synthesis and screening. In addition,
       our Virtual Library of drug-like molecules has been explicitly
       constructed for ease of laboratory synthesis.
 
STRATEGY
 
     Our objective is to be the industry leader in the generation, evolution and
optimization of novel lead candidates. We intend to utilize our scientific and
technology assets in the discovery
 
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process through a mix of collaborative and internal programs by applying the
following business strategies:
 
     - Establish multiple collaborations with large pharmaceutical and
       biotechnology companies focused on biological targets chosen by the
       collaborators. We intend to collaborate with large pharmaceutical and
       biotechnology companies on fully funded programs aimed at biological
       targets chosen by these collaborators. Our collaborative efforts are
       exclusively focused on the discovery process, with a particular emphasis
       on the discovery of novel compounds against biological targets. We
       believe our technology platform provides us with opportunities to
       establish multiple collaborations, which may be for the same disease
       state. We believe this will allow us to build a portfolio of
       opportunities that may include project initiation fees, research support,
       milestone payments and royalties.
 
     - Conduct internal discovery efforts aimed at selected biological targets,
       retaining a larger economic interest in the subsequently outlicensed lead
       candidates. We also intend to conduct our own internally funded discovery
       programs by choosing biological targets of current scientific interest
       and working in collaboration with genomics, biotechnology or screening
       companies. After identifying lead candidates that are ready for
       development, we intend to outlicense them, retaining a larger economic
       interest in such candidates as they are developed and commercialized by a
       third party.
 
     - Broaden the scope of our technology through application of our Discovery
       Engine process in alternative industries such as the agrochemical and
       materials science field. We recently initiated a collaboration in the
       agrochemical field with Novartis. We also are considering additional
       opportunities in alternative industries, including the industrial
       chemical and materials science field. In December 1998, we established
       ChiroChem Discovery Services, LLC, to develop and sell specifically
       designed chiral libraries.
 
     - Maintain technology leadership in both software development and rapid
       synthesis capabilities. We intend to continue to extend our technology
       leadership through enhancements of existing software, design of future
       generations of software and continued advancements of our synthesis
       capabilities. We believe that these developments will allow us to
       decrease the time required to discover lead candidates and to maintain
       our technology leadership and competitive advantage.
 
COMBICHEM'S PROCESS: THE DISCOVERY ENGINE
 
     The successful implementation of our Discovery Engine process requires the
direct involvement of and interaction between our chemists and our software
applications team. This process consists of the following steps:
 
     Data analysis -- the compilation and analysis of screening data, literature
information and available data about the target. The starting point for a drug
discovery program varies depending on the amount of prior information that is
available. The collaborator may have tested its corporate collection of
compounds or some other chemical library. The collaborator may also have
information regarding structures of compounds that are initial hits (moderately
active compounds), information regarding structures that are inactive against
the particular target or prior information about the target structure itself. On
the other hand, if little or no prior information or screening data is available
on the initial hits or target, we can make available for screening our
proprietary Universal Informer Library as a way of generating a relevant set of
information with which to initiate the Discovery Engine. See "CombiChem's
Proprietary Technologies -- Universal Informer Library."
 
     The analysis of the available information is a critical step in the process
because it will determine what type of program will be undertaken -- lead
generation, lead evolution or lead optimization -- and the resources that will
be required. See "CombiChem's Discovery Programs."
 
     Hypothesis generation -- the software-based generation of models that
predict the biological activity of molecular structures. Once the analysis of
the available data is completed by our chemists and software applications team,
the information is used as input for hypothesis generation. The steps involved
in hypothesis generation are:
 
     - Conformational analysis. Conformational analysis is performed on each
       active and inactive molecule to determine which shapes or conformations
       such molecules can take.
 
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       Because it is typically not known which of these shapes a particular
       molecule will assume when it shows its greatest activity against a
       biological target, all reasonable conformations are computationally
       described and analyzed. Our proprietary technology allows for the
       analysis of large data sets and complex molecular structures to be
       completed quickly and thoroughly.
 
     - Hypothesis generator. Using the screening data and the results of
       conformational analysis, the hypothesis generation software produces
       computational models, called hypotheses, that attempt to explain the
       observed differences in biological activity between active and inactive
       molecules. In the early phases of a discovery program, the hypothesis
       generator will often generate many hypotheses that are consistent with
       the data. The repeated application of the Discovery Engine cycle
       systematically tests the hypotheses, eliminating some while strengthening
       others by providing supporting data. Repeating this procedure results in
       predictive hypotheses. We believe that our proprietary design technology
       differs from others currently in use in that it (1) includes all of the
       screening data (including inactives) in generating hypotheses, (2) takes
       into account a much broader characterization of molecule-target
       interaction and (3) forces convergence to a predictive model of the
       important binding features by probing the target systematically using
       rapid synthesis and screening.
 
     Virtual Library search -- the computational search of the Virtual Library
to find molecular structures that fit the hypotheses. Once the hypotheses are
generated, they are used to search our proprietary Virtual Library to identify
molecular structures that have the features represented in the hypotheses. The
Virtual Library is a computational representation of a very large number of
molecules chosen for ease of laboratory synthesis. For each hypothesis that is
generated, a more focused library of tens to hundreds of molecules from the
Virtual Library is chosen for synthesis in the laboratory. The Virtual Library
is generated and searched by proprietary design technology, which can exploit
much larger libraries than is possible with commercially available tools. See
"CombiChem's Proprietary Technologies -- Virtual Library."
 
     Library synthesis -- the laboratory synthesis of molecular structures that
are selected from the Virtual Library using a wide range of chemistries. Once
the more focused library of compounds is designed using molecules chosen from
the Virtual Library, our chemists are responsible for synthesizing the compounds
in the laboratory. Unlike many combinatorial chemistry groups, our chemists are
not restricted to particular chemical reactions or a limited list of structural
templates, thus providing maximum flexibility to synthesize the libraries
quickly. See "CombiChem's Proprietary Technologies -- Synthesis and Analytical
Chemistry Technology."
 
     The above four steps in the Discovery Engine process are completed by our
project teams. Once the molecules are synthesized, those libraries are then sent
to the partner or a contract group for screening. Data from these assays will be
available to us for the next iteration of the cycle. With each iteration, the
Discovery Engine provides more information, improving the hypotheses and
increasing the likelihood of discovering active molecules with desirable
pharmacological characteristics. Eventually, the hypotheses will converge to
provide lead compounds that warrant further testing as development candidates.
It currently takes our scientists approximately three months to advance through
the steps in one Discovery Engine cycle. Depending upon the information
available to start a project, it may take two to four iterations of the cycle to
generate strongly predictive hypotheses that may eventually yield novel and
highly active lead candidates.
 
     Our Discovery Engine process is being validated by both our active
collaborative programs and retrospective analysis of drug discovery examples
taken from the recent scientific literature. In one such example, we applied our
design technology to a project where the data provided was a compilation of
third-party research into the design of HIV protease inhibitors. The objective
was to determine whether our process could be used to discover novel inhibitors
for the enzyme given a collection of only weakly active hits from screening. We
generated hypotheses with distinct features by collecting information on eight
weakly active HIV protease inhibitors and 500 randomly selected inactive
molecules with the same drug-like characteristics as the weakly active
compounds. Each of these weakly active compounds was found by either an academic
or commercial team in the early phases of trying to discover an HIV protease
drug. To assess whether the generated hypotheses are, in fact, able to predict
the activities of new molecules, several highly potent HIV protease inhibitors,
including currently marketed drugs, were added to a virtual library of several
hundred inactive compounds. Using the hypotheses, we searched the Virtual
Library.
 
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The search produced a list of highly ranked protease inhibitors with a variety
of chemical structures, including some of the highly potent HIV protease
inhibitors currently under development or marketed by major pharmaceutical
companies. The structures selected from the Virtual Library differ significantly
from those used to develop the hypotheses, validating our capabilities in lead
evolution. We have similarly validated our technology on over a dozen other
literature data sets and on several programs with collaborators. In our lead
evolution programs with several collaborators, we have already been successful
in evolving from one structural series to multiple, novel structural series
while improving biological activity. These results and a variety of equally
successful applications of the Discovery Engine demonstrate the viability of our
computational drug discovery methods and the strength of our proprietary
technology.
 
COMBICHEM'S PROPRIETARY TECHNOLOGIES
 
     To implement our Discovery Engine process, we have developed and assembled
an integrated set of proprietary technologies. These include the following:
 
  Universal Informer Library
 
     The use of many traditional drug discovery approaches presupposes the
existence of prior information to start the process. However, recent efforts
such as the Human Genome Project and others are producing a number of novel
targets about which there is limited prior information. In addition, there are
many known targets for which no suitable leads have been identified. To address
these situations, our scientists developed a Universal Informer Library. Our
Universal Informer Library consists of a computer-designed, proprietary
collection of approximately 13,000 physical compounds. Unlike other libraries
that are used to identify lead structures directly after screening, the
Universal Informer Library is used to gather information concerning the relevant
binding features that are important to the target. The compounds in the
Universal Informer Library are molecules with the potential to bind to many
different targets. Screening against the Universal Informer Library is therefore
intended to provide a few, weakly active compounds against the background of
many, varied inactive compounds. Using this data, hypotheses may be extracted,
which allow the Discovery Engine to be initiated.
 
     The Universal Informer Library was designed to provide hits for virtually
all possible targets. However, if there is some reason to expect certain
structural features to be relevant to a particular target, the Universal
Informer Library can be augmented with compounds that contain those features. In
this way, information gained from prior experience can be incorporated into the
Universal Informer Library; this may improve the hypotheses and therefore reduce
the number of cycles required to identify a lead candidate.
 
     We completed validation of our Universal Informer Library approach by
screening a subset of the Universal Informer Library against a wide range of
targets and achieving an outcome comparable to that typically seen in the
pharmaceutical industry with libraries containing hundreds of thousands of
compounds.
 
  Virtual Library
 
     Our Virtual Library is a computational representation of a very large
number of molecules chosen for the ease with which they can be synthesized in
the laboratory. To maximize the likelihood that the Virtual Library will contain
potent, patentable compounds active against most targets, we populated it with
hundreds of novel structural templates derived from a large range of chemical
reactions. Each of the templates has two to four sites at which a wide variety
of structural changes can be made synthetically using available chemicals. This
chemistry can also be scaled up to give ready access to quantities of each lead
candidate sufficient to perform early preclinical testing. The Virtual Library
is generated and searched by two components of our proprietary software: Virtual
Library Cascader(TM) software and Virtual Library Search software. See
"-- Design Technology."
 
  Synthesis and Analytical Chemistry Technology
 
     Once the Virtual Library is searched for collections of molecules that
match the hypotheses, our chemists initiate synthesis of these molecules in the
laboratory. The challenge for our chemists is to select the technique that will
most quickly achieve the synthesis of the library. While there is considerable
debate throughout the industry about the relative merits of various methods of
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chemical synthesis (solid versus solution phase, for example), our chemists have
the flexibility to use the appropriate approach for each specific synthesis
task. We believe we have expertise in most or all of the readily used techniques
and, in addition, have access to a number of new proprietary methods.
 
     As long as relatively straightforward chemistry is applied to library
production, synthesis is generally not the rate-limiting step. The challenge
lies in the isolation and purification of the library compounds. We apply
several approaches, including a number of proprietary semi-automated techniques,
to facilitate these procedures in order to achieve purity standards of greater
than 85%.
 
  Design Technology
 
     We rely on our proprietary design technology in order to complete several
of the key steps in our Discovery Engine. The proprietary design technology
includes:
 
     Conformational analysis software -- a computer program for identifying the
distinct three-dimensional shapes of a molecule. Conformational analysis is
performed on each active and inactive molecule to determine which shapes or
conformations such molecules can take. It is typically unknown which of these
shapes a particular molecule will assume when it shows its greatest activity
against a biological target. As a result, all reasonable conformations are
computationally described and analyzed. We have developed proprietary
conformational analysis software, which rapidly determines all the distinct,
reasonable shapes each molecule can assume. Both the speed and the thoroughness
of the conformational analysis software distinguish it from commercial chemistry
software and permit the Discovery Engine to handle large data sets.
 
     Hypothesis generation software -- a computer program for analyzing
screening data to identify the requirements a potential drug must satisfy to
bind to this target. Once conformational analysis has been applied to each of
the screened molecules, our proprietary hypothesis generation software produces
computational models that can estimate the biological activity of chemical
structures. These models, called hypotheses, are generated by applying methods
from statistics, information theory, physical chemistry and computer science to
the screening data in order to identify the differences between active and
inactive compounds. The predictive capabilities of the computational models and
the novel algorithms used to produce them distinguish our hypothesis generator
from commercial chemistry software.
 
     Virtual Library Cascader software -- a computer program for conveniently
describing virtual libraries. The Cascader software facilitates the rapid
specification of virtual libraries to the computer. By providing databases of
reagents and descriptions of reactions to the Cascader, a chemist can quickly
describe large libraries of compounds to the computer. The Cascader can use the
resulting description to construct explicit subsets of the large virtual library
and to present the structures to the chemist and to the Virtual Library Search
software.
 
     Virtual Library Search software -- a computer program for selecting
molecules from the Virtual Library that, when synthesized and screened, will
provide the most information about additional binding requirements. The Virtual
Library search software uses hypotheses to estimate computationally the potency
of prospective compounds. The goal is to increase the likelihood that the
chemists devote their synthesis efforts to compounds that fit the hypotheses and
are thus most likely to bind to the target. By using the computer to test the
compounds in the Virtual Library against the hypotheses, the Discovery Engine
can rapidly identify both active compounds which satisfy several different
hypotheses and informative compounds which discriminate among hypotheses.
Routinely searching virtual libraries with billions of compounds has generally
not been possible with commercial chemistry software.
 
     Each cycle of the Discovery Engine refines the assessment of the best
hypothesis for the target in question. After several cycles, the resulting
hypothesis can be used to design highly potent compounds from a broad range of
chemical classes including those not easily synthesized by standard techniques.
By facilitating the design of a variety of potent compounds for preclinical
testing, the Discovery Engine has the potential to increase greatly the
likelihood that at least one of these compounds passes the hurdles and
eventually becomes a commercial drug.
 
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COMBICHEM'S DISCOVERY PROGRAMS
 
     We are applying our technology to discover lead compounds for biological
targets chosen by our collaborators. In addition, we are selecting our own
biological targets of interest.
 
     In the first instance, where we are working on a target chosen by a
collaborator, the commercial terms are negotiated based on a number of factors,
including the number of targets to be included in the collaboration and the type
of program -- lead generation, lead evolution or lead optimization. Depending
upon the type of program, we will work on the program for a period of one to two
years. We will assign a dedicated project team, funded by the collaborator,
consisting of applications scientists and synthetic, medicinal and analytical
chemists. The team composition and size is dependent upon the type of program
and its objectives. To ensure confidentiality, we provide target exclusivity to
each of our collaborators. Each team works in a dedicated laboratory. At the
conclusion of the program, assuming its objectives have been met, the program
team will transfer the lead structure(s) to the collaborator. At this point, our
work is completed, but the partner will continue to develop the lead candidate.
As the collaborator develops the lead candidate and reaches certain agreed-upon
objectives, we will receive milestone payments. Eventually, when the lead
candidate becomes a marketed drug, we will receive royalties on the sales of the
drug.
 
     In our internal programs, we pay for all of the work to be completed and
will outlicense the lead structures to a partner for the development and
commercialization phases.
 
     Depending upon the data available, the Discovery Engine can be applied to
three types of discovery programs: lead generation, lead evolution and lead
optimization. Lead generation uses the Universal Informer Library to generate
information for the Discovery Engine in situations where little or no prior
information is known about the target. Lead evolution begins with existing
information (either from the collaborator or from the scientific literature)
regarding a lead candidate with the objective of identifying different
structural series that can provide either other development options or an
enhanced patent position. The evolution path may be chosen either as an
outgrowth of a lead optimization program or directly from a collaborator's
established lead candidate series. Lead optimization involves a lead candidate
provided by a collaborator that requires improvement prior to being identified
as a drug development candidate. Using our computational drug discovery
approach, initial libraries are constructed around a given template. Using a
convergent, iterative process, subsequent libraries are increasingly focused as
increased activity (e.g., affinity, selectivity) is achieved.
 
  Collaborative Agreements
 
     CombiChem's collaborative agreements are as follow:
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
      COMPANY NAME               TARGET OR THERAPEUTIC AREA OF FOCUS            TYPE OF PROGRAM
- ---------------------------------------------------------------------------------------------------
<S>                         <C>                                              <C>
 Elan/Athena                Multiple targets in central nervous system       Lead generation, lead
                            conditions                                         evolution, and lead
                                                                               optimization
 
 ICOS                       Identified, undisclosed target                   Lead evolution
 
 ImClone                    Multiple targets in oncology                     Lead generation, lead
                                                                               evolution
 
 Novartis Crop              Herbicide, fungicide and insecticide             Lead optimization
 Protection AG
 
 Ono                        Program based on Universal Informer Library      Target selection, Lead
                                                                             generation
 
 Roche Bioscience           Protein-Protein interaction                      Lead optimization
                            Enzyme                                           Lead evolution
                            Receptor                                         Lead optimization
 
 Sumitomo                   Target implicated in osteoarthritis and          Lead evolution
                            rheumatoid arthritis
 
 Teijin                     G-protein coupled receptor                       Lead evolution(1)
- ---------------------------------------------------------------------------------------------------
</TABLE>
 
(1) The Teijin program started as a lead optimization program.
 
                                        9
<PAGE>   11
 
  Internal Discovery Programs
 
     We are conducting our own internally funded discovery programs by choosing
biological targets of current scientific interest and working in collaboration
with genomics, biotechnology or screening companies. After identifying lead
candidates that are ready for development, we intend to outlicense them,
retaining a larger economic interest in such candidates as they are developed
and commercialized by a third party.
 
COMBICHEM'S COLLABORATIVE ARRANGEMENTS
 
     Our business model is to enter into collaborative arrangements focused on
drug discovery efforts to improve our chances of achieving profitability and to
minimize our financing requirements. Commercial terms of a collaborative
arrangement are driven by the number and nature of the targets. The key
components of the commercial terms typically contained in our collaborations
include project initiation fees, research funding, milestone payments and
royalties.
 
     We have the following completed or active collaborative arrangements:
 
  Athena Neurosciences, Inc., a wholly owned subsidiary of Elan Corporation, plc
 
     In October 1997, we entered into a multiple project collaborative agreement
with Athena Neurosciences, Inc., a wholly owned subsidiary of Elan Corporation,
plc. The agreement provides for a three-year research program to discover novel
therapeutic compounds for treatment of central nervous system conditions. The
first project was initiated upon signing, with a second project initiated in
March 1998. The agreement provides for Elan/Athena's access to the Universal
Informer Library as deemed necessary by the research management committee
composed of Elan/Athena and CombiChem representatives. Under the agreement,
Elan/Athena paid a project initiation fee and agreed to provide research funding
and milestone payments upon the achievement of pre-determined objectives.
Elan/Athena will also make royalty payments on worldwide sales of any products
resulting from the collaboration. The agreement may be terminated by either
party 90 days following an uncured material breach or by Elan/Athena after the
one-year anniversary upon 90 days prior written notice. In connection with the
initial collaborative agreement, Elan International Services Ltd., an affiliate
of Elan/Athena, purchased 1,000,000 shares of common stock for $8.0 million. In
addition, the same affiliate acquired 250,000 shares of common stock in the
initial public offering.
 
  ICOS Corporation
 
     In March 1998, we entered into a collaborative agreement with ICOS
Corporation providing for a lead evolution project on an undisclosed target.
Under the agreement, ICOS receives exclusive global rights to develop and market
any products resulting from the collaboration. ICOS made an advance payment in
April 1998, and agreed to pay research support funding, payments upon
achievement of certain clinical milestones and royalty payments on any product
sales. The lead evolution project terminates on August 31, 2000. The agreement
may be terminated by either party 90 days following an uncured material breach.
 
  ImClone Systems Incorporated
 
     In October 1997, we entered into a collaborative agreement with ImClone
Systems Incorporated providing for a two-year research program to identify and
characterize novel small molecule inhibitors to multiple targets for development
in oncology. The agreement provides for ImClone's access to our Universal
Informer Library and Virtual Library. Under the terms of the agreement, ImClone
agreed to provide us with research support payments, milestone payments upon the
achievement of certain program objectives and royalties on worldwide product
sales of therapeutic products that may arise out of the collaboration. The
agreement may be terminated by either party 90 days following an uncured
material breach. In connection with the collaborative agreement, ImClone
purchased 312,500 shares of common stock for $2.0 million.
 
  Novartis Crop Protection AG
 
     In May 1998, we entered into a collaborative agreement with Novartis Crop
Protection AG providing for a two-year lead optimization project for the
herbicide, fungicide and insecticide markets. Under the agreement, Novartis paid
a project initiation fee and agreed to provide
 
                                       10
<PAGE>   12
 
research funding and milestone payments upon the achievement of certain
milestones. Novartis has exclusive global rights to develop and market or
sub-license products resulting from the collaboration. We will be entitled to
royalties on sales of any products resulting from the collaboration. The
agreement may be terminated by either party 90 days following an uncured
material breach.
 
  Ono Pharmaceutical Co., Ltd.
 
     In December 1998, we entered into a collaborative agreement with Ono
Pharmaceutical Co., Ltd. providing for a two-year lead generation research
program on an undisclosed target. Under the agreement, Ono paid a project
initiation fee and agreed to provide research funding and milestone payments
upon the achievement of certain milestones. Ono will make royalty payments on
worldwide sales of any products resulting from the collaboration. The agreement
may be terminated by either party 90 days following an uncured material breach.
 
  Roche Bioscience, a division of Syntex (U.S.A.) Inc.
 
     In October 1996, we entered into a collaborative agreement with Roche
Bioscience providing for a broad two-year research program to perform research
against three initial targets, including a protein-protein interaction, an
enzyme and a receptor, with an option to add additional targets. Roche
Bioscience can elect one of the approaches -- lead generation, lead evolution or
lead optimization -- for each research program against each collaboration
target. A program may be initiated at any time during the term of the
collaboration, thereby extending the term to allow for completion of each
program. Under the agreement, Roche Bioscience paid a project initiation fee and
agreed to provide research funding and to make milestone payments upon the
achievement of certain milestones. Roche Bioscience will make royalty payments
on worldwide sales of any products resulting from the collaboration. As of
January 31, 1999, we had successfully concluded the research phase and delivered
lead candidates to Roche for further development. As this development process
continues, Roche will make additional payments if certain milestones are met.
During 1998, we achieved three research milestones in this collaboration,
triggering cash milestone payments in two of the three projects.
 
  Sumitomo Pharmaceuticals Co., Ltd.
 
     In August 1997, we entered into a collaborative agreement with Sumitomo
Pharmaceuticals Co., Ltd. providing for a two-year lead evolution program on a
target that is believed to play a fundamental role in osteoarthritis and
rheumatoid arthritis. Under the agreement, Sumitomo paid a project initiation
fee and agreed to provide research funding and milestone payments upon the
achievement of certain milestones. Sumitomo will make royalty payments on
worldwide sales of any products resulting from the collaboration. Sumitomo may
extend the research period for up to four successive six-month periods upon
mutual agreement. The agreement may be terminated by either party 90 days
following an uncured material breach.
 
  Teijin Limited
 
     In March 1996, we entered into a collaborative agreement with Teijin
Limited providing for a one-year research program on a G-protein coupled
receptor target. In March 1997, we amended our agreement to extend the research
phase of the collaborative agreement for an additional year. While the initial
focus of the collaboration was lead optimization, the effort was redirected to
lead evolution during the course of the research. Under the agreement, Teijin
paid a project initiation fee and agreed to provide research funding and
milestone payments upon the achievement of certain milestones. Teijin also
committed internal resources to the discovery effort. Teijin will make royalty
payments on any products resulting from the collaboration. We retain the rights
to the compounds arising under this collaboration in North and South America;
Teijin has rights to these compounds in Asia and Europe with a right of first
negotiation to acquire our rights. Under the original agreement, either party
may terminate the agreement in the event of a material breach remaining uncured
for 60 days. As of March 31, 1998, we successfully concluded the research phase
and delivered lead candidates to Teijin for further development. As this
development process continues, Teijin will make additional payments if certain
milestones are met.
 
                                       11
<PAGE>   13
 
RESEARCH AND DEVELOPMENT
 
     Our expenses for research and development activities were as follows:
 
<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31,
                                          --------------------------
                                           1996      1997      1998
                                          ------    ------    ------
                                                (IN THOUSANDS)
<S>                                       <C>       <C>       <C>
Collaborative...........................  $  420    $4,317    $9,209
Proprietary.............................   4,820     4,400     5,849
</TABLE>
 
     The increases reflect the additional costs incurred with the expansion of
the Company's collaborative agreements and the investments in proprietary
technologies.
 
COMPETITION
 
     Many organizations are actively attempting to identify, optimize and
generate lead compounds for potential pharmaceutical development. We compete
with the research departments of pharmaceutical companies, biotechnology
companies, combinatorial chemistry companies and research and academic
institutions, as well as other computationally based drug discovery companies.
Many of these competitors have greater financial and human resources and more
experience in research and development than we have. Historically, large
pharmaceutical companies have maintained close control over their research
activities, including the synthesis, screening and optimization of chemical
compounds. Many of these companies, which represent one of the largest potential
markets for our products and services, are internally developing combinatorial
and computational approaches and other methodologies to improve productivity,
including major investments in robotics technology to permit the automated
parallel synthesis of compounds. In addition, these companies may already have
large collections of compounds previously synthesized or ordered from chemical
supply catalogs or other sources against which they may screen new targets.
Other sources of compounds include compounds extracted from natural products,
such as plants and microorganisms, and compounds created using rational drug
design. Academic institutions, governmental agencies and other research
organizations are also conducting research in areas in which we are working,
either on their own or through collaborative efforts. We anticipate that we will
face increased competition in the future as new companies enter the market and
advanced technologies become available. Our processes may be rendered obsolete
or uneconomical by technological advances or entirely different approaches
developed by one or more of our competitors. The existing approaches of our
competitors or new approaches or technology developed by our competitors may be
more effective than those developed by us.
 
PATENTS AND PROPRIETARY INFORMATION
 
     Our success will depend in large part on our own, our licensees' and our
licensors' ability to obtain and defend patents for each party's respective
technologies and the compounds and other products, if any, resulting from the
application of such technologies. Our success will also depend on our ability to
maintain trade secrets and operate without infringing upon the proprietary
rights of others, both in the United States and in foreign countries. The patent
positions of pharmaceutical and biotechnology companies, including ours, are
uncertain and involve complex legal and factual questions for which important
legal principles are largely unresolved. We have pending United States and
foreign patent applications relating to various aspects of our technology,
certain systems, materials and methods used in screening compounds and the
libraries or compounds contained in the libraries. These patent applications are
either owned or co-owned by us or rights under them are licensed to us. To date,
one of our foreign patents has issued and two United States patents have issued.
To the extent that any foreign patent application filed in the European Patent
Office or the Japanese Patent Office issues as a patent, a challenge to the
validity of such patent may be presented in an opposition proceeding. Patents
may not issue as a result of any such pending applications. Even if patents are
issued, such patents may not be sufficiently broad to afford protection against
competitors with similar technologies. We are aware of five United States
patents issued to third parties that claim proprietary rights; two of these
patents are entitled "System and method for automatically generating chemical
compounds with desired properties", the third is entitled "System, method, and
computer program for at least partially automatically generating chemical
compounds having desired properties" and the fourth and fifth are entitled
"Method of generating a plurality of chemical compounds in a spatially arranged
array." Although we believe that our current activities do not infringe these
patents or the patents of other third
 
                                       12
<PAGE>   14
 
parties, we continually assess our position with respect to such patents. Our
belief about our activities may not be upheld in any litigation over patents. In
addition, our future technological developments may not be outside the scope of
these patents or the patents of other third parties. Further, third parties may
seek to assert such patent rights against us, which would result in significant
legal costs and require substantial management resources. We may need a license
from a third party to continue practicing our rights. We may not be able to
obtain such a license, if required, on commercially reasonable terms, if at all.
From time to time, we receive correspondence from third parties to license
patents owned or controlled by third parties. Our inability to obtain or
maintain patent protection or necessary licenses could have a material adverse
effect on our business and results of operations. Our inability either to
demonstrate non-infringement of these and other current and future patents,
whether issued in the United States or overseas, or to obtain the appropriate
licenses, would have a material adverse effect on our business and results of
operations. Moreover, there can be no assurance that we or our customers will be
able to obtain patent protection for lead compounds or pharmaceutical products
based upon our or our customers' technologies. Any patents issued to us or our
collaborative partners, or for which we have license rights, may be challenged,
invalidated or circumvented. The rights granted under any licenses may not
provide competitive advantages to us. To the extent that we or our consultants
or collaborators use intellectual property owned by others in their work for us,
disputes may also arise as to the rights in related or resulting know-how and
inventions. Litigation may be necessary to enforce our patent and license rights
or to determine the scope and validity of others' proprietary rights. Any such
litigation, whether or not the outcome thereof is favorable to us, could result
in substantial cost to and diversion of effort by us. Further, United States
patent law does not provide any remedies for infringement that occurred before
the patent is issued. Our commercial success will also depend upon successfully
avoiding the infringement of current and future patents issued to competitors
and upon maintaining the technology licenses upon which certain of our current
products are, or any future products under development might be, based. If our
competitors prepare and file patent applications in the United States that claim
inventions also claimed by us or our collaborators, we may have to participate
in interference proceedings declared by the Patent and Trademark Office to
determine the priority of invention, which could result in substantial cost to
us, even if the outcome is favorable to us. An adverse outcome could subject us
to significant liabilities to third parties and require us to license disputed
rights from third parties or cease using the technology.
 
     A United States patent application is maintained under conditions of
confidentiality while the application is pending in the Patent and Trademark
Office. As a result, we cannot determine the inventions being claimed in pending
patent applications filed by our competitors in the Patent and Trademark Office.
A number of pharmaceutical and biotechnology companies and research and academic
institutions have developed technologies, filed patent applications or received
patents on various technologies that may be related to our business. Some of
these technologies, applications or patents may conflict with our technologies
or patent applications. Such conflict could limit the scope of the patents, if
any, that we may be able to obtain, or result in the denial of our patent
applications. We may not be able to obtain licenses to patents held by third
parties that may cover our activities at a reasonable cost, if at all. To
continue to practice our technology we would have to develop or obtain
alternative technologies which we may not be able to do. We currently have
certain licenses from third parties and in the future may require additional
licenses from other parties. These licenses may be required to refine our
Discovery Engine further and to allow our collaborators to develop, manufacture
and market commercially viable products effectively. Such licenses may not be
obtainable on commercially reasonable terms, if at all. In addition, patents
underlying such licenses may not be valid and enforceable. Finally, the
proprietary nature of any patented technology underlying such licenses may not
remain proprietary. We rely substantially on certain technologies that are not
patentable or proprietary and are therefore available to our competitors. We
also rely on certain proprietary trade secrets and know-how that are not
patentable. Although we believe we have taken steps to protect our unpatented
trade secrets and know-how, in part through the use of confidentiality
agreements with our employees, consultants and certain of our contractors, there
can be no assurance that (1) these agreements will not be breached, (2) we would
have adequate remedies for any breach or (3) our trade secrets will not
otherwise become known or be independently developed or discovered by
competitors. Our failure to protect all or part of our patents, trade secrets
and know-how could have a material adverse effect on our business and results of
operations.
 
                                       13
<PAGE>   15
 
GOVERNMENT REGULATION
 
     Regulation by governmental entities in the United States and other
countries will be a significant factor in the production and marketing of any
pharmaceutical products that may be developed by one of our customers or
collaborators or, in the event we decide to develop a drug beyond the early
testing phase, by us. The nature and the extent to which such regulation may
apply to our customers will vary depending on the nature of any such drugs.
Virtually all drugs developed by our customers will require regulatory approval
by governmental agencies prior to commercialization. In particular, drugs to be
administered to humans are subject to rigorous testing and other approval
procedures established by the FDA and by foreign regulatory authorities. Various
federal and, in some cases, state statutes and regulations also govern or
influence, among other things, the testing, manufacture, safety, efficacy,
labeling, storage, record keeping, approval, advertising and promotion of such
drugs. Non-compliance with applicable requirements can result in fines, warning
letters, recall or seizure of products, clinical study holds or delays, total or
partial suspension of production, refusal of the government to grant approvals,
and civil and criminal penalties. The process of obtaining these approvals and
the subsequent compliance with appropriate federal and foreign statutes and
regulations are time-consuming and require the expenditure of substantial
resources. Generally, in order to gain FDA approval, a company first must
conduct studies in the laboratory and in animal models to gain preliminary
information on a compound's efficacy and to identify any safety problems.
Studies must be conducted by laboratories that comply with FDA regulations
regarding good laboratory practices. The results of these studies are submitted
as a part of an investigational new drug application that the FDA must review
before human testing of a potential drug can begin. In order to commercialize
any products, we or our customer will be required to sponsor and file an
investigational new drug application and will be responsible for initiating and
overseeing the human testing to demonstrate the safety and efficacy that are
necessary to obtain FDA and foreign regulatory authority approval of any such
drugs. Human testing is normally done in three phases and generally takes two to
five years but may take longer to complete. After completion of human testing of
a new product, FDA and foreign regulatory authority marketing approval must be
obtained. If the product is classified as a new drug, we or our customer will be
required to file a new drug application and receive approval before commercial
marketing of the drug can begin. The testing and approval processes require
substantial time and effort. Approvals may not be granted on a timely basis, if
at all. New drug applications submitted to the FDA can take, on average, two to
five years to obtain approval. If questions arise during the FDA review process,
approval can take more than five years. Even if FDA regulatory clearances are
obtained, a marketed product is still subject to continual review. Later
discovery of previously unknown problems or failure to comply with the
applicable regulatory requirements may result in restrictions on the marketing
of a product or withdrawal of the product from the market, as well as possible
civil or criminal sanctions. Domestic manufacturing facilities used by us or our
customers are subject to biannual inspections by the FDA and must comply with
the FDA's current good manufacturing practices regulations. To comply with such
regulations, a manufacturer must spend funds, time and effort in the areas of
production and quality control to ensure full technical compliance. The FDA
stringently applies regulatory standards for manufacturing. For marketing
outside the United States, we or our customer will also be subject to foreign
regulatory requirements governing human testing and marketing approval for
drugs. The requirements governing the conduct of human testing, product
licensing, pricing and reimbursement vary widely from country to country.
 
     Our research and development processes involve the controlled use of
hazardous materials. We are subject to federal, state and local laws and
regulations governing the use, manufacture, storage, handling and disposal of
such materials and certain waste products. Although we believe that our
activities currently comply with the standards prescribed by such laws and
regulations, the risk of accidental contamination or injury from these materials
cannot be completely eliminated. In the event of such an accident, we could be
held liable for any damages that result, and any such liability could exceed our
resources. In addition, we may be required to incur significant costs to comply
with environmental laws and regulations in the future. The occurrence of any
such event could have a material adverse effect on our business and results of
operations.
 
                                       14
<PAGE>   16
 
SALES AND MARKETING
 
     We market our products directly to customers through participation in trade
conferences and seminars and publications in scientific and trade journals.
 
     To date, we have sold our product offerings to our collaborative partners
primarily through the efforts of our senior management and dedicated business
development professionals. In addition, we utilize outside consultants to
supplement our business development activities in targeted geographies or
industries.
 
HUMAN RESOURCES
 
     As of February 28, 1999, we had 93 full-time employees, 55 of whom have
Ph.D. degrees. Of these employees, 76 were engaged in research and development
and 17 were engaged in marketing and general administration. None of our
employees are covered by collective bargaining agreements. We consider our
relations with our employees to be good.
 
RISKS AND UNCERTAINTIES
 
     The following is a summary of some of the many risks we face in our
business. You should carefully review these risks in evaluating our business.
 
THE TECHNOLOGY WE USE IN OUR BUSINESS IS NEW AND HAS NOT BEEN SHOWN TO BE
SUCCESSFUL IN DISCOVERING NEW DRUGS.
 
     Our drug discovery process is new. We have not yet shown that it can
successfully be used to discover drug candidates that ultimately become
commercial products. Furthermore, our drug discovery efforts are focused on some
targets with unknown functions. Development of new drugs is highly uncertain.
Our drug discovery process may not result in drug candidates that will be safe
or effective or commercially successful as products. If our technology is not
validated through the successful discovery of drug candidates, our business will
be adversely affected.
 
     Our strategy, which is unproven, is to use our proprietary technology to
rapidly identify, optimize and obtain rights to as many drug candidates as
possible. Our near-term profitability depends entirely on whether we can enter
into additional collaborative agreements and maintain our current agreements.
The pricing and nature of our collaborative relationships, however, is such that
our potential customers may include only a limited number of drug, biotechnology
and agrochemical companies. Our strategy also involves conducting our own
discovery programs by choosing biological targets of current scientific interest
and working in collaboration with screening companies to discover drug
candidates. Accordingly, we cannot be certain that our strategy will prove
successful.
 
     Our success also depends on whether potential customers view our process as
an effective drug discovery tool. Historically, drug, biotechnology and
agrochemical companies have identified and optimized new drug candidates in
their own research departments. They have done so primarily to protect the
proprietary nature of their activities. To achieve our business objectives, we
must convince these companies that our technology and capabilities justify the
outsourcing of their programs to us. We may not, however, be able to attract any
future customers on acceptable terms for our products and services or develop a
sustainable, profitable business. Any failure to do so would adversely affect
our business.
 
     We generally structure each of our collaborative agreements to provide us
with payments for:
 
     - initiating the collaboration,
 
     - providing research for a specified period (typically over one or two
       years),
 
     - attaining specifically-negotiated milestones, and
 
     - earning royalties from the commercial sale of any successfully developed
       drug candidate.
 
     To date, we have generated most of our revenues from providing research
services under our collaborative agreements. We receive these revenues, however,
only for a limited period and they are generally offset by corresponding
research costs. After we complete the research phase of each collaborative
agreement, we will receive additional revenues only if our collaborators achieve
the
 
                                       15
<PAGE>   17
 
specified milestones or sell products on which we earn royalties from commercial
sales. Any failure to achieve the milestones or to earn royalties could
adversely affect our business.
 
WE MAY NEVER BE PROFITABLE.
 
     Our near term profitability depends entirely on whether we can enter into
additional collaborative agreements and maintain our current agreements. As a
result, we are unable to predict when, or if, we will become profitable. We have
not yet received, and may never receive, any revenues from royalties for
commercial sales by a customer. In addition, our strategy includes potentially
developing and licensing drug candidates that we have identified through our
internal programs, at our own expense, to others for further development. To
date, we have not entered into any of these licenses. We may never enter into
any of these licenses on acceptable terms or at all.
 
THE SUCCESSFUL IMPLEMENTATION OF OUR STRATEGY IS DEPENDENT ON THE ACTIVITIES OF
OTHERS, OVER WHICH WE HAVE NO CONTROL.
 
     Our strategy depends on our ability to enter into collaborative
arrangements with others on a regular basis. We may not be able to continue to
establish additional collaborative arrangements. If we are successful in
establishing additional arrangements, they may not be on favorable terms. The
collaborative arrangements also may not ultimately be successful. Any failure to
enter into additional collaborative arrangements on favorable terms would
adversely affect our business. The timing of when we receive revenues from
collaborative arrangements depends on both our efforts and our collaborators'
efforts. Generally, for any prospective drug candidate discovered with our
technology each of the following events must occur before the candidate results
in a commercialized product that will generate milestone payments and royalties:
 
     - the early and human testing of the drug candidate must be successful,
 
     - the required regulatory approvals, both in the United States and foreign
       countries, must be obtained,
 
     - manufacturing, sales and marketing capabilities must be established, and
 
     - the product must be successfully marketed in commercial quantities and at
       reasonable costs.
 
     We do not currently plan to perform any of these activities. Therefore, we
will depend on others' expertise and commitment to develop and commercialize
products based on drug candidates we discovered or optimized. The amount and
timing of resources that current and future collaborators devote to our
collaborations are not within our control, and we cannot be certain that their
efforts will be successful.
 
     In addition, when we are eligible to earn milestone payments differs for
each agreement. For instance, for some collaborations, we may not earn milestone
fees until the collaborator has advanced products into human testing, which may
be well into the future. Furthermore, our collaborative partners are not
obligated to develop or commercialize drug candidates we have discovered.
Rather, each collaborative partner may independently move forward with a
competing drug candidate that the partner developed either internally or in
collaboration with others, including our competitors. The potential drugs a
collaborative partner develops also may be derivatives of the drug candidates we
provided to the partner. While our existing collaborative agreements allow us to
retain milestone and royalty payment rights with respect to drugs developed from
certain derivatives, disputes may arise over how the payment provisions in our
agreements apply to those types of drugs.
 
     Conflicts also may arise between collaborative partners about who has the
proprietary rights to particular compounds or drug candidates. Additionally, our
collaborators generally may terminate their agreements with us upon short notice
and following an uncured material breach. Termination of our existing or future
collaborative agreements, would result in a loss of anticipated revenue and
could adversely affect our business.
 
     Furthermore, even though we use independent teams for each collaborative
project, conflicts may arise among our collaborators about which collaborator
has rights to any overlapping compounds or drug candidates developed with our
technologies. Any failure to manage our collaborative relationships
successfully, maintain confidentiality among our relationships or prevent these
types of conflicts could lead to costly and time consuming disputes and a loss
of
                                       16
<PAGE>   18
 
reputation, capital or current or future collaborators. Any of these events
could adversely affect our business.
 
SIGNIFICANT FLUCTUATIONS IN OUR QUARTERLY RESULTS COULD MATERIALLY IMPACT OUR
STOCK PRICE.
 
     Our operating results may vary substantially from quarter to quarter and
will not necessarily be indicative of results in later periods. Any quarterly
fluctuations in revenue or financial results may materially impact our stock
price. To date, we have received revenues from project initiation fees, research
funding and milestone fees paid under our collaborative agreements. We expect
that most of our revenues for the foreseeable future will continue to consist of
these payments. In any one quarter, we may receive multiple or no payments from
our collaborators.
 
OUR SUCCESS IS DEPENDENT ON OUR ABILITY TO BUILD AND MAINTAIN A STRONG
INTELLECTUAL PROPERTY POSITION; FAILURE TO DO SO WOULD HAVE AN ADVERSE EFFECT ON
OUR BUSINESS.
 
     Our success will depend on our ability and the ability of our licensors to
obtain and defend patents and other proprietary rights for our technologies and
the compounds and other products resulting from our technologies. In addition,
to be successful we must avoid infringing the proprietary rights of others. Our
patent position, like that of many drug and biotechnology companies, is
uncertain and involves complex legal and factual questions for which important
legal principles are unresolved. We may not develop or obtain rights to products
or processes that are patentable. Even if we do obtain patents, they may not
adequately protect the technology we own or have licensed. In addition, others
may challenge, seek to invalidate, infringe or circumvent any patents we own or
license, and rights we receive under those patents may not provide competitive
advantages to us. Further, our activities may infringe the patent rights of
others.
 
     We cannot be certain that any patents will issue as a result of any pending
applications. In addition, any issued patents still may not provide sufficient
protection against competitors with similar technologies. Although we believe
that our current activities do not infringe any patents of others, we
continually assess our position. We cannot be certain that we would be
successful in any litigation over patents or that our future technological
developments will be outside the scope of others' patent rights.
 
     We may also need to initiate litigation, which could be time consuming and
expensive, to enforce our proprietary rights or to determine the scope and
validity of others' rights. If litigation results, a court may find our patents
or those of our licensors invalid or may find that we have infringed on a
competitor's rights. If any of our competitors have filed patent applications in
the United States which claim technology we also have invented, the Patent and
Trademark Office may require us to participate in expensive interference
proceedings to determine who has the right to a patent for the technology.
 
     We currently license rights from other parties. In the future we may
require additional licenses from other parties to refine our drug discovery
process further and to allow our collaborators to develop, manufacture and
market commercially viable products effectively. We cannot be certain that:
 
     - we will be able to obtain any licenses on commercially reasonable terms,
       or at all,
 
     - any patents underlying such licenses will be valid and enforceable, or
 
     - the proprietary nature of any patented technology underlying such
       licenses will remain proprietary.
 
     In addition, if we breach any of our licenses, we may lose important
rights.
 
     We also rely on unpatented trade secrets and know-how to maintain our
competitive position, which we seek to protect, in part, by confidentiality
agreements with employees, consultants and others. These parties may breach or
terminate these agreements, and we may not have adequate remedies for any
breach. In addition, our competitors may independently discover our trade
secrets. We also rely substantially on certain technologies that are not
patentable or proprietary and are therefore available to our competitors.
 
                                       17
<PAGE>   19
 
OUR INDUSTRY IS EXTREMELY COMPETITIVE AND WE MAY ULTIMATELY PROVE UNSUCCESSFUL.
 
     Many organizations are actively attempting to identify, optimize and
generate compounds for potential drug development. We compete with the research
departments of drug companies, biotechnology companies, agrochemical companies,
combinatorial chemistry companies and research and academic institutions as well
as other drug discovery companies. Many of our competitors have greater
financial and human resources and more experience in research and development.
We anticipate that we will face increased competition in the future as new
companies enter the market and advanced technologies become available.
Ultimately, our processes may become obsolete or uneconomical as a result of new
technologies or approaches our competitors develop. For a more complete
description of the competitive nature of our industry, please see
"Business -- Competition."
 
FAILURE TO EXPAND OUR OPERATIONS AND MANAGE OUR EXPANDED OPERATIONS WOULD HAVE
AN ADVERSE EFFECT ON OUR BUSINESS.
 
     Our success will depend on whether we can expand our operations to service
additional collaborative arrangements and manage our expanded operations. To be
cost-effective, we must enhance our productivity by further automating our
processes and improving our technology generally. In addition, we must
successfully structure and manage additional collaborative relationships,
including maintaining the confidentiality of the research being provided to our
customers. We may not be able to add the technical personnel needed to meet the
staffing requirements of any additional collaborative relationships. In
addition, our efforts to automate our processes further or to improve our
technology may not be successful. Any failure to achieve these goals could
adversely affect our business.
 
THE LOSS OF ONE OR MORE OF THE KEY MEMBERS OF OUR SCIENTIFIC AND MANAGEMENT
STAFF COULD ADVERSELY AFFECT OUR BUSINESS.
 
     The loss of one or more of the key members of our scientific and management
staff could adversely affect our business. Our future success also depends on
the continued service of our key design, engineering, scientific, software and
management personnel and on our ability to identify, hire and retain any
additional personnel. There is intense competition for these qualified
personnel. We may not be able to continue to attract and retain the personnel
necessary to develop our business. Any failure to attract and retain key
personnel could adversely affect our business.
 
FAILURE TO COMPLY WITH REGULATORY REQUIREMENTS WOULD HAVE AN ADVERSE EFFECT ON
OUR BUSINESS.
 
     Any failure to comply with regulatory requirements in the United States and
overseas can result in fines, warning letters, recall or seizure of products,
clinical study holds or delays, total or partial suspension of production,
refusal of the government to grant approvals, and civil and criminal penalties.
United States and foreign government regulation will be a significant factor in
the production and marketing of any drug products that we, our customers or our
collaborators develop. The scope of the regulation will vary depending on the
type of products involved. Virtually all drug products our customers develop
will require regulatory approval. In particular, the FDA and foreign regulatory
authorities require vigorous early state and human testing and other procedures
for human drug products. Numerous regulations also govern the manufacturing,
safety, labeling, storage, record keeping, reporting and marketing of drug
products.
 
     The process of obtaining and complying with regulatory approvals is time
consuming and expensive. The testing and approval processes require substantial
time and we cannot be certain if or when any approval will be granted for any
products resulting from our technologies.
 
     Even if FDA regulatory clearances are obtained, a marketed product is still
subject to continual review. Later discovery of previously unknown problems or
failure to comply with the applicable regulatory requirements may result in
restrictions on a product's marketing or withdrawal of the product from the
market, as well as possible civil or criminal sanctions. In addition, domestic
manufacturing facilities are subject to regular FDA inspections and must comply
with the FDA's manufacturing practices regulations. To comply with these
regulations, a manufacturer must spend funds, time and effort on production and
quality control.
 
     For marketing outside the United States, we, our collaborators or customers
will also be subject to foreign regulatory requirements governing human clinical
trials and marketing approval.
 
                                       18
<PAGE>   20
 
For a more complete description of regulatory requirements we, our customers and
collaborators face, please see "Business -- Government Regulation."
 
OUR FUTURE CAPITAL NEEDS ARE UNCERTAIN AND MAY HAVE AN ADVERSE EFFECT ON OUR
BUSINESS.
 
     Our capital requirements depend on many factors, including:
 
     - our ability to enter into additional collaborative arrangements,
 
     - competing technological and market developments,
 
     - changes in our existing collaborative arrangements,
 
     - the cost of filing, prosecuting, defending and enforcing patent claims
       and other proprietary rights,
 
     - the purchase of additional equipment,
 
     - the progress in our drug discovery programs, and
 
     - our collaborators' ability to commercialize milestone and royalty-bearing
       compounds.
 
     We may be required to raise additional capital over a period of several
years to continue our operations. Additional funding, if necessary, may not be
available on favorable terms. If adequate funds are not available, we may be
required to curtail operations significantly or obtain funds through
arrangements with collaborative partners or others that may require us to
relinquish rights to certain of our technologies, product candidates, products
or potential markets that we would not otherwise relinquish. Any failure to
receive additional funding would adversely affect our business.
 
THE EFFORTS OF THE GOVERNMENT AND OTHERS TO REDUCE THE COST OF HEALTH CARE MAY
HAVE AN ADVERSE EFFECT ON OUR COLLABORATORS AND OUR BUSINESS.
 
     We expect that a substantial portion of our revenue in the foreseeable
future will be derived from products and services provided to the drug,
biotechnology and agrochemical industries. Accordingly, our success in the
foreseeable future depends on the success of the companies within those
industries and continued demand for our products and services.
 
     The efforts of governments and third party payors to contain or reduce the
cost of health care will continue to affect the business and financial condition
of these companies. For example, in certain foreign markets, pricing or
profitability of prescription pharmaceuticals is subject to governmental
control. In the United States, a number of legislative and regulatory proposals
to change the health care system have been proposed in recent years. In
addition, an increasing emphasis on managed care in the United States has and
will continue to increase pressure on drug pricing. We cannot predict whether
legislative or regulatory proposals will be adopted. If proposals or reforms are
adopted and adversely affect the business of our collaborators or customers, our
business may also be adversely affected.
 
OUR USE OF HAZARDOUS MATERIALS MAY SUBJECT US TO SIGNIFICANT ENVIRONMENTAL RISKS
WHICH COULD HAVE AN ADVERSE EFFECT ON OUR BUSINESS.
 
     We use hazardous materials in our research and development activities. As a
result, we are subject to federal, state and local laws and regulations
governing the use, manufacture, storage, handling and disposal of hazardous
materials. The risk of accidental contamination or injury exists. If an accident
occurs, we could be responsible for any damages and the amount of the damages
could exceed our resources. In addition, we may incur significant costs to
comply with environmental laws and regulations in the future. Any of these
events could adversely affect our business.
 
OUR EXECUTIVE OFFICERS, DIRECTORS AND THEIR AFFILIATES MAY INFLUENCE ALL MATTERS
REQUIRING STOCKHOLDER APPROVAL.
 
     Our executive officers and directors and their affiliates own approximately
30% of our outstanding common stock. As a result, these stockholders may
influence all matters requiring stockholder approval, including the election of
directors and the approval of significant corporate transactions. This
concentration of ownership could also delay or prevent a change in our ownership
that other stockholders may favor.
 
                                       19
<PAGE>   21
 
THE MARKET PRICE OF OUR COMMON STOCK IS VOLATILE AND YOU MAY NOT BE ABLE TO MAKE
A RETURN ON YOUR INVESTMENT.
 
     The market price of our common stock is likely to be volatile and could
fluctuate widely in response to many factors, including:
 
     - announcements of new technologies or products by us or our competitors,
 
     - developments concerning patents or other proprietary rights,
 
     - publicity regarding the status of compounds we or our collaborators are
       developing,
 
     - regulatory developments, both in the United States and foreign countries,
 
     - public concern about the effectiveness of new technologies,
 
     - changes in expectations of securities analysts concerning our company or
       our industry in general;
 
     - quarterly fluctuations in our revenues and financial results, and
 
     - general market conditions.
 
     As a result, our operating results may be below the expectations of market
analysts and investors, which could reduce the market price of our common stock.
 
     The stock market has experienced extreme price and volume fluctuations that
have particularly affected the market prices of the securities of many companies
in our industry. Often, these fluctuations have been unrelated or
disproportionate to the operating performance of the companies. These market
fluctuations, as well as general economic, political and market conditions, may
reduce the market price of our common stock. In addition, in the past,
securities class action litigation has often been instituted following periods
of volatility in the market prices of securities. If we face such litigation in
the future, it would be costly and time consuming and could adversely affect our
business.
 
OUR CHARTER, DELAWARE LAW AND CERTAIN CONTRACT PROVISIONS MAY PREVENT OR DELAY A
CHANGE OF CONTROL WHICH MAY NOT BE IN THE BEST INTERESTS OF OUR STOCKHOLDERS.
 
     Certain provisions of our charter and stock options, as well as certain
provisions of Delaware law, could delay or impede the removal of incumbent
directors and could make more difficult a merger, tender offer or proxy contest
involving us, even if the events could be beneficial to our stockholders. These
provisions could also limit the price that investors might be willing to pay for
our common stock. Our charter also authorizes our Board of Directors to issue
shares of undesignated preferred stock without stockholder approval on terms
that the Board may determine. The issuance of preferred stock could decrease the
amount of earnings and assets available for distribution to our other
stockholders or otherwise adversely affect the rights and powers, including
voting rights, of our other stockholders. Moreover, the issuance of preferred
stock may make it more difficult for another party to acquire, or may discourage
another party from acquiring, voting control of us.
 
WE MAY NOT BE SUCCESSFUL IN RESOLVING ALL OUR YEAR 2000 ISSUES WHICH COULD HAVE
AN ADVERSE EFFECT ON OUR BUSINESS.
 
     The year 2000 issue refers to the inability of certain date-sensitive
computer chips, software, and systems to recognize a two-digit date field as
belonging to the 21st century. This is a significant issue for most, if not all
companies, with far reaching implications, some of which cannot be anticipated
or predicted with any degree of certainty. The year 2000 issue may create
unforeseen risks to us from our internal computer systems as well as from
computer systems of third parties. Any failure of our and/or others' computer
systems could adversely affect our business. For a more complete description of
the status of our year 2000 readiness program and contingency plans we have
instituted, please see "Item 7 -- Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Year 2000."
 
ITEM 2. PROPERTIES
 
     We currently lease and occupy approximately 40,000 square feet of
laboratory and office space in San Diego, California. We also lease and occupy
approximately 6,000 square feet of office
                                       20
<PAGE>   22
 
space in Palo Alto, California. Our primary San Diego lease (34,000 sq. ft.)
expires in May 2006 and a 6,000 square foot laboratory lease expires in October
1999. The Palo Alto lease expires in October 2002.
 
     In February 1999, we entered into a 15-year lease agreement for 75,000
square feet of laboratory and office space in San Diego, California with a
target commencement date of November 1, 1999. Upon commencement of the new
lease, the existing lease for 34,000 square feet in San Diego, California will
terminate. Additionally, upon termination, the landlord will purchase all tenant
improvements from us at their projected net book value of $2.5 million.
 
ITEM 3. LEGAL PROCEEDINGS
 
     We are not a party to any legal proceedings.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     None.
 
                                       21
<PAGE>   23
 
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS
 
     Shares of our common stock are traded on the Nasdaq National Market under
the symbol "CCHM." Prior to our initial public offering in May 1998, there was
no established published trading market for our common stock. The following
table presents the quarterly high and low sales prices of the common stock as
reported by Nasdaq. Such quotations represent inter-dealer prices without retail
markup, markdown or commission and may not necessarily represent actual
transactions.
 
<TABLE>
<S>                       <C>                     <C>
- ----------------------------------------------------------------------
                                       1998
- ----------------------------------------------------------------------
                          High                    Low
- ----------------------------------------------------------------------
 First quarter            n/a                     n/a
- ----------------------------------------------------------------------
 Second quarter           $8.75                   $6.13
- ----------------------------------------------------------------------
 Third quarter            $8.63                   $3.38
- ----------------------------------------------------------------------
 Fourth quarter           $5.88                   $3.38
- ----------------------------------------------------------------------
</TABLE>
 
     We had 191 stockholders of record and approximately 800 beneficial
stockholders as of February 28, 1999.
 
DIVIDEND POLICY
 
     We have not paid dividends on our common stock and intend to continue this
policy to retain earnings for use in our business.
 
USE OF PROCEEDS
 
     A Registration Statement on Form S-1 (File No. 333-37981) registering
2,587,500 shares of our common stock was declared effective by the SEC on May 7,
1998. The amount of net offering proceeds from the IPO and over-allotment option
was approximately $16.2 million. Such proceeds have been invested in short-term
investment-grade securities.
 
     The principal purposes of the offering were to: (1) increase our equity
capital, (2) create a public market for the our Common Stock in order to
facilitate future access to public equity markets and (3) create liquidity for
our existing stockholders. We intend to use the net proceeds of this offering,
together with our existing cash and cash equivalents and short-term investments,
to fund research and development, expand laboratory and office facilities and
for general corporate purposes. We may also use a portion of the net proceeds
for the acquisition of businesses, technologies or products complementary to us.
There are no present arrangements or agreements for any such acquisitions.
 
     The amounts actually expended for each purpose may vary significantly
depending upon numerous factors, including the amount and timing of additional
collaborative agreements, the progress of our development, technological
advances, the commercial potential of the our services and the status of the our
competitors. We believe that our existing cash, cash equivalents and short-term
investments, combined with the net proceeds of this offering, projected funding
from equipment leases and interest income will be adequate to satisfy our
capital requirements and fund operations for the foreseeable future.
 
                                       22
<PAGE>   24
 
ITEM 6. SELECTED FINANCIAL DATA
 
<TABLE>
<CAPTION>
                                       PERIOD FROM
                                       MAY 23, 1994
                                      (INCEPTION) TO          YEAR ENDED DECEMBER 31,
                                       DECEMBER 31,    -------------------------------------
                                           1994         1995      1996      1997      1998
                                      --------------   -------   -------   -------   -------
                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                   <C>              <C>       <C>       <C>       <C>
STATEMENT OF OPERATIONS DATA:
  Total revenue.....................      $  --        $    50   $ 2,967   $ 7,471   $15,074
  Total operating expenses..........        711          6,763     8,085    12,004    19,111
                                          -----        -------   -------   -------   -------
  Loss from operations..............       (711)        (6,713)   (5,118)   (4,533)   (4,037)
  Net loss..........................      $(706)       $(6,675)  $(5,118)  $(4,322)  $(3,312)
                                          =====        =======   =======   =======   =======
  Basic net loss per share..........                   $(19.18)  $(11.30)  $ (4.45)  $ (0.36)
                                                       =======   =======   =======   =======
  Shares used in computing basic net
     loss per share.................                       348       453       971     9,140
                                                       =======   =======   =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                       AS OF DECEMBER 31,
                                        -------------------------------------------------
                                         1994     1995       1996       1997       1998
                                        ------   -------   --------   --------   --------
<S>                                     <C>      <C>       <C>        <C>        <C>
BALANCE SHEET DATA:
  Cash and cash equivalents...........  $1,622   $ 3,136   $    367   $  5,867   $ 20,334
  Short-term investments..............      --        --     12,166     11,055      9,025
  Working capital.....................   1,420     1,990      8,946     12,896     26,146
          Total assets................   1,796     3,997     16,505     25,376     41,980
  Long-term obligations, including
     current portion..................      --       584      2,541      4,944      6,214
  Redeemable convertible preferred
     stock............................   2,250     9,650     23,107     23,130         --
  Accumulated deficit.................    (706)   (7,381)   (12,499)   (16,821)   (20,133)
          Total stockholders'
            (deficit) equity..........    (682)   (7,414)   (12,516)    (6,449)    30,177
</TABLE>
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
       OF OPERATIONS
 
     This annual report may contain predictions, estimates and other
forward-looking statements that involve a number of risks and uncertainties,
which are discussed above in Item 1 at "Risks and Uncertainties." While this
outlook represents our current judgment on the future direction of our business,
such risks and uncertainties could cause actual results to differ materially
from any future performance suggested below. We undertake no obligation to
release publicly the results of any revisions to these forward-looking
statements to reflect events or circumstances arising after the date of this
annual report.
 
OVERVIEW
 
     CombiChem is a computational product discovery company that is applying its
proprietary design technology and rapid synthesis capabilities to accelerate the
discovery process for new drugs and chemical products. We believe our approach
offers pharmaceutical and chemical companies the opportunity to conduct their
discovery efforts in a more productive and cost-effective manner. Using our
proprietary Discovery Engine(TM)process, we focus on the generation, evolution
and optimization of potential new lead candidates for our collaborative partners
who will then develop, manufacture, market and sell any resulting products. We
believe that our process is widely applicable to a variety of disease targets
and therapeutic indications as well as to other industries such as agrochemical,
industrial chemical and materials science. To date, we have established
collaborative agreements with Athena Neurosciences, Inc., a wholly owned
subsidiary of Elan Corporation, plc, ICOS Corporation, ImClone Systems
Incorporated, Novartis Crop Protection AG, Ono Pharmaceutical Co., Ltd., Roche
Bioscience, a division of Syntex (U.S.A.) Inc., Sumitomo Pharmaceuticals Co.,
Ltd. and Teijin Limited. In addition, we are using our approach on internal
programs to discover new lead candidates that will then be outlicensed to third
parties, while retaining a larger economic interest. In December 1998, we
further broadened the application of the technology by establishing a joint
venture with Chirotech Technology, Ltd., a member of the Chiroscience Group of
companies, to commercialize libraries of chiral compounds.
 
                                       23
<PAGE>   25
 
The joint venture, ChiroChem Discovery Services, LLC, was established to develop
and sell specifically designed chiral compound libraries.
 
     Our revenue to date is primarily attributable to the receipt of project
initiation fees, milestone payments and research funding. Project initiation
fees are received from our collaborators upon, or shortly following, execution
of the collaborative agreement. Milestone payments are received from
collaborators upon achievement of certain pre-determined objectives. In
connection with the performance of research services, we receive research
funding under our collaborative agreements. Research funding typically is
received only during the life of the research program under the particular
collaboration. In addition, we may receive advance payments from our
collaborators or potential collaborators, which require us to complete certain
performance obligations. Such payments are recorded as deferred revenue when
received and are recognized as revenue when our performance obligations have
been met, as evidenced by our collaborator's written approval and acceptance.
The collaborative activities for which we receive revenue typically occur over a
one- to three-year period, if multiple projects are anticipated, or one to two
years for single project collaborations. The agreements provide for earlier
termination in certain circumstances. We expect that a significant portion of
our revenue for the foreseeable future will be comprised of such payments. The
receipt of project initiation fees is dependent on our ability to enter into
additional collaborative agreements that provide for such fees; the timing of
such payments will be difficult to predict. In addition, the timing of certain
revenue in the future will depend upon the completion of certain milestones as
provided for in our collaborative agreements, which are contingent and
uncertain. Milestone fees may be earned for different events or achievements in
different agreements. For certain collaborations, such fees may not be earned
until the collaborator has advanced products into human testing. In any one
fiscal quarter we may earn multiple or no payments from our collaborators.
Operating results may therefore vary substantially from period to period and
will not necessarily be indicative of results in subsequent periods. Completion
of the research phase of a single project collaboration or a single project
within a broad multiple project collaboration is not expected to have a material
adverse effect on our business. However, the termination or conclusion of any
collaborative agreement could have a material adverse effect on our business. In
addition, our failure to enter into additional collaborative agreements on
favorable terms would have a material adverse effect on our business.
 
     We have not been profitable since inception. We have incurred a cumulative
net loss of $20.1 million through December 31, 1998. Losses have resulted
principally from costs incurred in research and development activities related
to efforts to develop our technologies and from the associated administrative
costs of supporting these efforts. Our ability to achieve profitability is
dependent on our ability to market our technology and capabilities to
pharmaceutical, biotechnology, agrochemical and chemical companies.
 
RESULTS OF OPERATIONS
 
YEARS ENDED DECEMBER 31, 1998 AND 1997
 
  Revenue
 
     Our revenue for the year ended December 31, 1998 was $15.1 million, up from
$7.5 million for the same period in 1997. The increase in revenue resulted
primarily from entering into collaborative agreements with ICOS, Novartis and
Ono during 1998, the full-year effect of the Sumitomo, Elan/Athena and ImClone
agreements, which were executed in 1997, and the achievement of four milestones
in 1998. We received three milestone payments from Roche Bioscience and one from
Teijin during 1998. Revenue from collaborators exceeding 10% of total revenue
for the year ended December 31, 1998 was 38% from Roche, 17% from Sumitomo, 14%
from Elan/Athena and 12% from Ono.
 
  Operating Expenses
 
     Research and development expenses for the year ended December 31, 1998
totaled $15.1 million compared to $8.7 million for the same period in 1997.
Research and development costs incurred on behalf of our collaborators increased
$4.9 million due to an increase in the number of projects in the active
collaboration phase. Research and development costs incurred to advance our
proprietary technologies increased $1.4 million due to increased staffing and
the full year effect of operations added during 1997. We expect research and
development spending to increase over the
 
                                       24
<PAGE>   26
 
next several years due to increased activities related to collaborations,
internal programs and technology development.
 
     General and administrative expenses for the year ended December 31, 1998
totaled $4.1 million compared to $3.3 million for the same period in 1997. This
increase reflects increased business development activities and administrative
support for our expanded programs. These expenses will likely increase in future
periods to support our projected growth.
 
  Interest Income/Interest Expense
 
     Net interest income for the year ended December 31, 1998 was $0.9 million
compared to $0.4 million for the same period in 1997. This change reflects
increased cash and investment balances resulting from receipts under
collaborative agreements and our initial public offering in May 1998. Interest
income was partially offset by interest expense incurred on capital lease
obligations.
 
  Net Loss
 
     Net loss for the year ended December 31, 1998 was $3.3 million compared to
$4.3 million for the same period in 1997. The decreased loss is primarily
attributable to increased revenue from project initiation fees and milestone
achievements.
 
YEARS ENDED DECEMBER 31, 1997 AND 1996
 
  Revenue
 
     Revenue for the year ended December 31, 1997 was $7.5 million, up from $3.0
million for the same period in 1996. The increase in revenue resulted primarily
from entering into collaborative agreements with Sumitomo and Elan/Athena in
1997 and the full year effect of the Teijin and Roche collaborations, which were
executed in 1996. Revenues from collaborators exceeding 10% of total revenues
for the year ended December 31, 1997 was 39% from Sumitomo, 30% from Roche, and
18% from Elan/Athena.
 
  Operating Expenses
 
     Research and development expenses for the year ended December 31, 1997 were
$8.7 million, up from $5.2 million for the same period in 1996. This increase
reflects increased research and development expenses incurred on behalf of
collaborators. Such expenses include salaries for additional chemists and
molecular design staff for each project team and the associated depreciation of
new laboratory equipment. We have the ability to direct our scientific personnel
to work either on our collaborative agreements or on our internal research
projects as needs arise. We expect research and development spending to increase
over the next several years due to increased activities related to
collaborations, internal programs and technology development.
 
     General and administrative expenses for the year ended December 31, 1997
were $3.3 million, up from $2.8 million for the same period in 1996. This
increase reflects increased business development activities, including outside
consulting fees and increased travel costs, and administrative support for our
expansion in 1997. These expenses will likely continue to increase in future
periods to support our projected growth.
 
  Interest Income/Interest Expense
 
     Net interest income for the year ended December 31, 1997 was $0.4 million
compared to a break-even position for the same period in 1996. This change
reflects increased cash and investment balances resulting from receipts under
collaborative agreements and the sale of common stock in conjunction with the
signing of the Elan/Athena and ImClone agreements. Interest income was partially
offset by interest expense incurred on capital lease obligations
 
  Net Loss
 
     Net loss for the year ended December 31, 1997 was $4.3 million compared to
$5.1 million for the same period in 1996. The decrease is primarily attributable
to additional revenue generated from corporate collaborations during 1997.
 
                                       25
<PAGE>   27
 
LIQUIDITY AND CAPITAL RESOURCES
 
     From inception through December 31, 1998, we financed our operations
through proceeds from our initial public offering and private placements of
equity securities, payments from corporate collaborators, and the utilization of
capital equipment lease financing. In May 1998, we completed our initial public
offering of 2,359,500 shares of our common stock (including partial exercise of
the underwriters' over-allotment option), generating net proceeds of
approximately $16.2 million.
 
     Net cash used in operating activities for the year ended December 31, 1998
was $1.9 million compared to net cash used of $3.5 million for the corresponding
period in 1997. The decrease in net cash used in operating activities was
primarily attributable to the reduction of our net loss and the collection of
advance payments from collaborators.
 
     At December 31, 1998, we held cash and cash equivalents and short-term
investments with a value of $29.4 million. Our working capital at December 31,
1998 was $26.1 million. We have maintained capital lease arrangements since
1994. Under these arrangements, we have funded certain capital expenditures with
lease terms ranging from 36 to 48 months in duration. As of December 31, 1998,
we had utilized $9.2 million of an available $11.4 million financing facility.
We expect the net proceeds from our initial public offering completed in May
1998 and the interest income on the proceeds, together with the existing cash
and cash equivalents, short term investments, operating revenue and lease
financing arrangements, will be sufficient to finance our working capital and
capital requirements for the foreseeable future. Our capital requirements depend
on numerous factors. These factors include: (1) our ability to enter into
additional collaborative arrangements, (2) competing technological and market
developments, (3) changes in our existing collaborative relationships, (4) the
cost of filing, prosecuting, defending and enforcing patent claims and other
intellectual property rights, (5) the purchase of additional capital equipment,
(6) the progress of our drug discovery programs and (7) the progress of the
commercialization of milestone-and royalty-bearing compounds by our
collaborators. We may be required to raise additional capital over a period of
several years in order to continue to conduct our operations. Such capital may
be raised through additional public or private financing arrangements, as well
as collaborative arrangements, borrowings and other available sources. In
addition, we may from time to time earn milestone fees under our collaborations.
Milestone fees may be earned for different events or achievements in different
agreements. Furthermore, for certain collaborations, such fees may not be earned
until the collaborator has advanced products into human testing. Such milestones
may not be earned for several years, if at all. Our collaborative arrangements
may not produce revenue adequate to fund our operating expenses. Additional
funding, if necessary, may not be available on favorable terms, if at all. If
adequate funds are not available, we may be required to curtail operations
significantly or obtain funds through arrangements with collaborative partners
or others that may require us to relinquish rights to certain of our
technologies, product candidates, products or potential markets that we would
not otherwise relinquish. The failure to receive additional funding would have a
material adverse effect on our business and results of operations.
 
YEAR 2000 ISSUE
 
     Description of the Issue. The Year 2000 issue refers to the inability of
certain date-sensitive computer chips, software, and systems to recognize a
two-digit date field as belonging to the 21st century. Mistaking "00" for 1900
or any other incorrect year could result in a system failure or miscalculations
causing disruptions to operations, including manufacturing, a temporary
inability to process transactions, or send invoices, or engage in other normal
business activities. This is a significant issue for most, if not all companies,
with far reaching implications, some of which cannot be anticipated or predicted
with any degree of certainty. The Y2K issue may create unforeseen risks from our
internal computer systems as well as from computer systems of third parties with
which we deal. Our failures and/or those of third parties' computer systems
could have a material adverse impact on our ability to conduct our business.
 
     Year 2000 Readiness. We have formed a committee, including the chief
financial officer and the information technology manager, to evaluate Y2K risks
and readiness. The committee has addressed both information technology and
non-information technology systems. Examples of information technology systems
include hardware and software purchased from external sources and internally
developed software. Examples of non-information technology systems include
 
                                       26
<PAGE>   28
 
laboratory equipment and those systems that operate the facilities
infrastructure. The committee has also considered the systems of those third
parties with which we maintain a material relationship.
 
     We have substantially completed an assessment of our information technology
and non-information technology systems. The assessment phase is, however, an
on-going effort. As part of this effort, we are assessing the potential severity
of the impact of Y2K induced failures, conducting an inventory of information
systems for each business area, prioritizing systems or components to be
converted or replaced, and developing a contingency plan for mission critical
systems.
 
     Renovation procedures have begun on those systems that we have identified
in our assessment as being non-Y2K compliant. This renovation entails
installation of commercially-available software and firmware updates and
performance of system tests. The renovation phase of our Year 2000 efforts is
approximately 90% complete.
 
     Although the assessment and renovation phases are not 100% complete, based
on the work performed to date, we do not foresee an inherently complex Y2K
problem. Accordingly, we will concurrently validate and implement converted or
replaced mission-critical systems. Validation will take place in an environment
that is representative of the true operating environment. Implementation will
address the integration of Y2K compliant systems into our true operating
environment and will take into consideration the interdependencies of the
systems involved. Finally, we will ensure that the Y2K contingency plan is
available for each business area. The validation phase is currently in process
and we expect this phase to be competed in the third quarter of 1999.
 
     For material third parties, we are obtaining written assurances that their
systems and/or products are, or will be, Y2K compliant. However, we are not
independently verifying their representations. In addition, while we are not
dependent on any sole-source suppliers to conduct our laboratory operations,
efforts are ongoing to monitor the progress of the Y2K preparations of our
current major suppliers of laboratory materials.
 
     Year 2000 Costs. The total cost of our Y2K activities is funded through
operating cash flows. We are expensing these costs as they are incurred. As of
February 28, 1999, we have not incurred any incremental costs to resolve our Y2K
issue and we expect that the total cost to become fully compliant will not
exceed $50,000.
 
     Year 2000 Risks and Contingencies. In the event that systems of third-party
providers or vendors of laboratory supplies fail to resolve Y2K issues that
effect services or product deliveries to us, we may have to change providers or
vendors. Such changes are not anticipated to have a material adverse effect on
our business. As previously indicated, we are preparing a Y2K contingency plan
which addresses each of the mission-critical systems of our business areas. This
plan will also identify strategies and available resources necessary to restore
operations.
 
ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS
 
     The Company's investment portfolio consists of short-term, high quality
debt securities. These securities are subject to interest rate risk, and will
decline in value if interest rates increase. An immediate 10% change in interest
rates would not have a material impact on our financial condition or results of
operations.
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
     The Company's financial statements and supplemental data required by this
item are set forth at the pages indicated in Item 14(a)(1).
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE
 
     Not applicable.
 
                                       27
<PAGE>   29
 
                                    PART III
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
     (a) Identification of Directors. The information under the caption
"Election of Directors," appearing in the Proxy Statement, is incorporated
herein by reference.
 
     (b) Identification of Executive Officers. The information under the heading
"Management," appearing in the Proxy Statement, is incorporated herein by
reference.
 
     (c) Section 16(a) Beneficial Ownership Regarding Compliance. The
information under the heading "Section 16 Beneficial Ownership Reporting
Compliance," appearing in the Proxy Statement, is incorporated herein by
reference.
 
ITEM 11. EXECUTIVE COMPENSATION
 
     The information under the headings "Executive Compensation and Other
Information," appearing in the Proxy Statement, is incorporated herein by
reference.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     The information under the heading "Ownership of Securities" appearing in
the Proxy Statement, is incorporated herein by reference.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     The information under the heading "Certain Transactions," appearing in the
Proxy Statement, is incorporated herein by reference.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
(a) (1) FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              NO.
                                                              ----
<S>                                                           <C>
Report of Ernst & Young LLP, Independent Auditors...........  F-2
Balance Sheets at December 31, 1997 and 1998................  F-3
Statements of Operations for the years ended December 31,
  1996, 1997 and 1998.......................................  F-4
Statements of Stockholders' Equity (Deficit) for the years
  ended December 31, 1996, 1997 and 1998....................  F-5
Statements of Cash Flows for the years ended December 31,
  1996, 1997 and 1998.......................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>
 
(2) FINANCIAL STATEMENT SCHEDULES
 
     All schedules are omitted because they are not applicable or the required
information is included in the financial statements or notes thereto.
 
(b) No reports on Form 8-K have been filed during the last quarter of the period
covered by this report.
 
                                       28
<PAGE>   30
 
(c) EXHIBITS
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                            DESCRIPTION
        --------                           -----------
        <S>        <C>
         3.1++     Certificate of Incorporation of the Company, as amended.
         3.2++     Form of Amended and Restated Certificate of Incorporation of
                   the Company to become effective immediately prior to the
                   Offering.
         3.3++     Bylaws of the Company, as amended.
         3.4++     Form of Restated Bylaws of the Company to be effective upon
                   completion of the Offering.
         4.1++     Form of Certificate for Common Stock.
        10.9++     Amended and Restated Investors' Rights Agreement between the
                   Company and the stockholders listed on Schedule A thereto,
                   dated November 15, 1996.
        10.11++    Series J Preferred Stock Purchase Agreement between the
                   Company and Jonathan Greene, dated June 11, 1997.
        10.12++    Series J Preferred Stock Purchase Agreement between the
                   Company and Andrew Smellie, dated June 11, 1997.
        10.13++    Warrant Agreement to Purchase Shares of the Series Z
                   Preferred Stock, as amended between the Company and
                   Comdisco, Inc., dated December 20, 1994.
        10.14++    Common Stock Purchase Warrant between the Company and LJL
                   BioSystems, Inc., dated June 15, 1995.
        10.15++    Form of Warrant to Purchase Shares of Series C Preferred
                   Stock between the Company and the purchasers listed on
                   Schedule A thereto, dated August 17, 1995.
        10.16++    Form of Warrant Agreement to Purchase Shares of Series C
                   Preferred Stock of the Company, between the Company and
                   Comdisco, Inc. in the amounts listed on Schedule A thereto.
        10.17++    Form of Warrant to Purchase Shares of Series Z Preferred
                   Stock between the Company and the purchasers listed on
                   Schedule A thereto, dated May 20, 1996.
        10.18++    Master Lease Agreement with the Company and Comdisco Inc.,
                   dated November 6, 1994, Schedule VL-1, dated November 11,
                   1994, Schedule VL-2 dated April 15, 1996 and Schedule VL-3
                   dated April 15, 1996.
        10.19*++   Collaboration Agreement between the Company and Teijin
                   Limited, dated March 29, 1996, as amended.
        10.20*++   Collaborative Research and License Agreement between the
                   Company and Roche Bioscience, dated October 25, 1996.
        10.21*++   Research and Technology Development Agreement between the
                   Company and Sumitomo Pharmaceuticals Co., Ltd., dated August
                   18, 1997.
        10.22*++   Collaborative Research and License Agreement between the
                   Company and ImClone Systems Incorporated, dated October 10,
                   1997.
        10.23*++   Collaborative Research and License Agreement between the
                   Company and Athena Neurosciences, Inc., dated October 15,
                   1997, as amended.
        10.24++    Full Recourse Secured Promissory Note and Stock Pledge
                   Agreement between the Company and Peter Myers, dated
                   September 5, 1995.
        10.28++    Promissory Note Secured by Stock Pledge Agreement between
                   the Company and Vicente Anido, Jr., dated June 6, 1997.
        10.29++    Stock Pledge Agreement between the Company and Vicente
                   Anido, Jr., dated June 6, 1997.
        10.30++    Employment Agreement with Peter Myers, dated March 1, 1995.
        10.33++    Employment Agreement with Vicente Anido, Jr., dated March
                   14, 1996.
</TABLE>
 
                                       29
<PAGE>   31
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                            DESCRIPTION
        --------                           -----------
        <S>        <C>
        10.34++    Employment Agreement with Lee R. McCracken, dated May 13,
                   1996.
        10.35++    Employment Letter with Karin Eastham, dated March 14, 1997.
        10.36++    Standard Industrial/Commercial Single-Tenant Lease between
                   the Company and Campson Corporation, dated December 22,
                   1995.
        10.38++    Lease Agreement between Harbor Investment Partners and the
                   Company, dated October 6, 1997.
        10.44++    1997 Stock Incentive Plan.
        10.45++    1997 Employee Stock Purchase Plan.
        10.46++    Form of Indemnification Agreement between the Company and
                   each of its directors.
        10.47++    Form of Indemnification Agreement between the Company and
                   each of its officers.
        10.48++    1997 Stock Incentive Plan Form of Notice of Grant of Stock
                   Option.
        10.49++    1997 Stock Incentive Plan Form of Stock Option Agreement.
        10.50++    1997 Stock Incentive Plan Form of Addendum to Stock Option
                   Agreement (Involuntary Termination Following Corporate
                   Transaction/ Change in Control).
        10.51++    1997 Stock Incentive Plan Form of Addendum to Stock Option
                   Agreement (Limited Stock Appreciation Right).
        10.52++    1997 Stock Incentive Plan Form of Stock Issuance Agreement.
        10.53++    1997 Stock Incentive Plan Form of Addendum to Stock Issuance
                   Agreement (Involuntary Termination Following Corporate
                   Transaction/ Change in Control).
        10.54++    1997 Stock Incentive Plan Form of Notice of Grant of
                   Automatic Stock Option (Initial Grant).
        10.55++    1997 Stock Incentive Plan Form of Notice of Grant of
                   Automatic Stock Option (Annual Grant).
        10.56++    1997 Stock Incentive Plan Form of Automatic Stock Option
                   Agreement.
        10.57++    1997 Employee Stock Purchase Plan Form of Stock Purchase
                   Agreement
        10.58*++   Collaborative Research and License Agreement between the
                   Company and ICOS Corporation, dated March 30, 1998.
        10.59*+    Collaborative Research and License Agreement by and between
                   the Company and Novartis Crop Protection AG, dated May 26,
                   1998.
        10.60+     Amendment No. 1 to the Promissory Note dated September 5,
                   1995 between the Company and Peter Myers dated as of June
                   15, 1998.
        10.61*+    Amendment to Collaborative Research and License Agreement by
                   and between the Company and Roche Bioscience a division of
                   Syntex (U.S.A.) Inc., dated as of July 31, 1998.
        10.62      Amended Promissory Note dated February 24, 1997 between the
                   Company and Vicente Anido Jr., Ph.D., amended as of November
                   8, 1998.
        10.63      Amendment No. 1 to Pledge Agreement by Vince Anido in favor
                   of the Company dated as of November 8, 1998.
        10.64*     Limited Liability Company Operating Agreement of ChiroChem
                   Discovery Services LLC between Chirotech Ltd. and CombiChem
                   JVR, Inc., dated as of December 1, 1998.
        10.65*     Cooperation Agreement between Chirotech Technology Ltd.,
                   Chirotech Ltd., CombiChem Inc., CombiChem JVR, Inc., and
                   ChiroChem Discovery Services LLC, dated as of December 1,
                   1998.
        10.66*     License Agreement between CombiChem Inc., and ChiroChem
                   Discovery Services LLC, dated as of December 1, 1998.
</TABLE>
 
                                       30
<PAGE>   32
 
<TABLE>
<CAPTION>
        EXHIBIT
         NUMBER                            DESCRIPTION
        --------                           -----------
        <S>        <C>
        10.67*     Services Agreement between CombiChem Inc. and ChiroChem
                   Discovery Services LLC, dated as of December 1, 1998.
        10.68*     Lead Generation Program Agreement by and between the Company
                   and Ono Pharmaceutical Co., Ltd., dated as of December 30,
                   1998.
        21.1       Subsidiaries of the Registrant.
        23.1       Consent of Ernst & Young LLP, Independent Auditors.
        24.1       Power of Attorney (see page 32).
        27.1       Financial Data Schedule.
</TABLE>
 
- ---------------
 +  Previously filed as an exhibit to Registrant's Quarterly Report on Form 10-Q
    for the quarter ended September 30, 1998 (No. 0-23473) and incorporated
    herein by reference.
 
++  Incorporated by reference to the same-numbered exhibit (except as otherwise
    indicated) to the Company's Registration Statement on Form S-1 (No.
    333-37981), as amended.
 
*   Certain confidential portions of this Exhibit were omitted by means of
    redacting a portion of the text (the "Mark"). This Exhibit has been filed
    separately with the Secretary of the Commission without the Mark pursuant to
    the Company's application requesting confidential treatment under Rule 406
    under the Securities Act.
 
SUPPLEMENTAL INFORMATION
 
     Copies of the Registrant's Proxy Statement for the Annual Meeting of
Shareholders to be held May 6, 1999 and copies of the form of proxy to be used
for such Annual Meeting will be furnished to the Commission at the same time
they are distributed to the shareholders.
 
                                       31
<PAGE>   33
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                              COMBICHEM, INC.
 
Date: March 30, 1999                          By:   /s/ VICENTE ANIDO JR.
 
                                                --------------------------------
                                                    Vicente Anido Jr., Ph.D.
                                                 President and Chief Executive
                                                             Officer
 
                               POWER OF ATTORNEY
 
     Know all men by these presents, that each person whose signature appears
below constitutes and appoints Vicente Anido Jr., Ph.D. or Karin Eastham, his or
her attorney-in-fact, with power of substitution in any and all capacities, to
sign any amendments to this Annual Report on Form 10-K, and to file the same
with exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, hereby ratifying and confirming all that the
attorney-in-fact or his or her substitute or substitutes may do or cause to be
done by virtue hereof.
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
Report has been signed below by the following persons on behalf of the
Registrant in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                   SIGNATURE                                TITLE                  DATE
                   ---------                                -----                  ----
<C>                                               <C>                         <S>
             /s/ VICENTE ANIDO JR.                President, Chief Executive  March 30, 1999
- ------------------------------------------------     Officer and Director
              Vicente Anido, Ph.D.
 
               /s/ KARIN EASTHAM                   Vice President, Finance    March 30, 1999
- ------------------------------------------------    and Administration and
                 Karin Eastham                     Chief Financial Officer
 
               /s/ PIERRE LAMOND                           Director           March 30, 1999
- ------------------------------------------------
                 Pierre Lamond
 
              /s/ PHILIPPE CHAMBON                         Director           March 30, 1999
- ------------------------------------------------
            Philippe Chambon, Ph.D.
 
                /s/ PETER MYERS                   Chief Scientific Officer,   March 30, 1999
- ------------------------------------------------   Chief Operating Officer
               Peter Myers, Ph.D.                        and Director
 
               /s/ ARTHUR REIDEL                           Director           March 30, 1999
- ------------------------------------------------
                 Arthur Reidel
 
               /s/ WILLIAM SCOTT                           Director           March 30, 1999
- ------------------------------------------------
              William Scott, Ph.D.
 
             /s/ MICHAEL J. PAZZANI                        Director           March 30, 1999
- ------------------------------------------------
           Michael J. Pazzani, Ph.D.
</TABLE>
 
                                       32
<PAGE>   34
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
COMBICHEM, INC.
Report of Ernst & Young LLP, Independent Auditors...........  F-2
Balance Sheets at December 31, 1997 and 1998................  F-3
Statements of Operations for the years ended December 31,
  1996, 1997 and 1998.......................................  F-4
Statements of Stockholders' Equity (Deficit) for the years
  ended December 31, 1996, 1997 and 1998....................  F-5
Statements of Cash Flows for the years ended December 31,
  1996, 1997 and 1998.......................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>
 
                                       F-1
<PAGE>   35
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
CombiChem, Inc.
 
     We have audited the accompanying balance sheets of CombiChem, Inc. as of
December 31, 1997 and 1998, and the related statements of operations,
stockholders' equity (deficit), and cash flows for each of the three years in
the period ended December 31, 1998. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of CombiChem, Inc. at December
31, 1997 and 1998, and the results of its operations and its cash flows for each
of the three years in the period ended December 31, 1998, in conformity with
generally accepted accounting principles.
 
                                              /s/  ERNST & YOUNG LLP
 
San Diego, California
January 18, 1999, except for
Note 9, as to which the date is
March 5, 1999
 
                                       F-2
<PAGE>   36
 
                                COMBICHEM, INC.
 
                                 BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                        ----------------------------
                                                            1997            1998
                                                        ------------    ------------
<S>                                                     <C>             <C>
Current assets:
  Cash and cash equivalents...........................  $  5,866,635    $ 20,334,201
  Short-term investments, available-for-sale..........    11,054,725       9,024,714
  Accounts receivable.................................       527,633       2,891,981
  Prepaid expenses and other current assets...........       767,594       1,310,180
                                                        ------------    ------------
Total current assets..................................    18,216,587      33,561,076
  Property and equipment, net.........................     5,961,177       7,901,545
  Restricted cash.....................................       262,143         279,143
  Deposits and other assets...........................       879,845         238,247
  Notes receivable from employee/stockholders.........        56,303              --
                                                        ------------    ------------
Total assets..........................................  $ 25,376,055    $ 41,980,011
                                                        ============    ============
 
                   LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable....................................  $    881,436    $  1,101,635
  Accrued liabilities.................................     1,394,046       1,295,386
  Deferred revenue....................................     1,475,752       3,192,981
  Current portion of obligations under capital
     leases...........................................     1,569,197       1,825,279
                                                        ------------    ------------
Total current liabilities.............................     5,320,431       7,415,281
Obligations under capital leases, less current
  portion.............................................     3,283,373       4,246,454
Deferred rent.........................................        91,227         141,771
Commitments
Redeemable convertible preferred stock, $.001 par
  value, 63,196,896 shares authorized at December 31,
  1997 and 5,000,000 authorized at December 31, 1998;
  31,019,635 and no shares issued and outstanding at
  December 31, 1997 and 1998, respectively............    23,129,968              --
Stockholders' equity (deficit):
Common stock, $.001 par value, 40,000,000 shares
  authorized; 3,227,005 and 13,399,201 shares issued
  and outstanding at December 31, 1997 and 1998,
  respectively........................................         3,227          13,399
Additional paid-in capital............................    12,519,952      51,861,673
Deferred compensation.................................    (1,582,320)     (1,140,684)
Notes receivable from stockholders....................      (569,061)       (424,830)
Accumulated deficit...................................   (16,820,742)    (20,133,053)
                                                        ------------    ------------
Total stockholders' equity (deficit)..................    (6,448,944)     30,176,505
                                                        ------------    ------------
Total liabilities and stockholders' equity
  (deficit)...........................................  $ 25,376,055    $ 41,980,011
                                                        ============    ============
</TABLE>
 
                            See accompanying notes.
                                       F-3
<PAGE>   37
 
                                COMBICHEM, INC.
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                     YEAR ENDED DECEMBER 31,
                                            -----------------------------------------
                                               1996           1997           1998
                                            -----------    -----------    -----------
<S>                                         <C>            <C>            <C>
Revenue:
Revenue under collaborative agreements:
  Project initiation fees and milestone
     payments.............................  $ 2,500,000    $ 3,333,331    $ 6,800,000
  Research and development funding........      420,000      4,137,250      8,274,434
Grant revenue.............................       47,400             --             --
                                            -----------    -----------    -----------
Total revenue.............................    2,967,400      7,470,581     15,074,434
Operating expenses:
  Research and development:
     Collaborative........................      420,000      4,316,938      9,208,931
     Proprietary..........................    4,820,253      4,399,620      5,848,672
                                            -----------    -----------    -----------
                                              5,240,253      8,716,558     15,057,603
  General and administrative..............    2,845,074      3,286,569      4,053,983
                                            -----------    -----------    -----------
Total operating expenses..................    8,085,327     12,003,127     19,111,586
                                            -----------    -----------    -----------
Loss from operations......................   (5,117,927)    (4,532,546)    (4,037,152)
Interest income...........................      144,639        662,525      1,429,363
Interest expense..........................     (145,139)      (251,665)      (524,522)
Foreign tax expense.......................           --       (200,000)      (180,000)
                                            -----------    -----------    -----------
Net loss..................................  $(5,118,427)   $(4,321,686)   $(3,312,311)
                                            ===========    ===========    ===========
Basic and diluted net loss per share......  $    (11.30)   $     (4.45)   $     (0.36)
                                            ===========    ===========    ===========
Shares used in computing basic net loss
  per share...............................      453,000        971,000      9,140,000
                                            ===========    ===========    ===========
</TABLE>
 
                            See accompanying notes.
                                       F-4
<PAGE>   38
 
                                COMBICHEM, INC.
 
                  STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
 
<TABLE>
<CAPTION>
                                                                                      NOTES
                                   COMMON STOCK       ADDITIONAL                    RECEIVABLE                        TOTAL
                               --------------------     PAID-IN       DEFERRED         FROM       ACCUMULATED     STOCKHOLDERS'
                                 SHARES     AMOUNT      CAPITAL     COMPENSATION   STOCKHOLDERS     DEFICIT      EQUITY (DEFICIT)
                               ----------   -------   -----------   ------------   ------------   ------------   ----------------
<S>                            <C>          <C>       <C>           <C>            <C>            <C>            <C>
Balance at December 31,
  1995.......................     660,165   $   660   $   119,057   $        --     $(150,000)    $ (7,380,629)    $ (7,410,912)
  Sale of common stock.......      74,000        74        22,126            --            --               --           22,200
  Repurchase and cancellation
    of common stock..........     (22,560)      (22)       (5,843)           --            --               --           (5,865)
  Net loss...................          --        --                          --            --       (5,118,427)      (5,118,427)
                               ----------   -------   -----------   -----------     ---------     ------------     ------------
Balance at December 31,
  1996.......................     711,605       712       135,340            --      (150,000)     (12,499,056)     (12,513,004)
  Sale of common stock.......   1,305,090     1,305    10,071,414            --            --               --       10,072,719
  Deferred compensation
    related to stock
    options..................          --        --     1,773,973    (1,773,973)           --               --               --
  Amortization of deferred
    compensation.............          --        --            --       191,653            --               --          191,653
  Sale of common stock for
    notes receivable.........   1,210,310     1,210       539,225            --      (540,435)              --               --
  Repayment of notes
    receivable...............          --        --            --            --       121,374               --          121,374
  Net loss...................          --        --                          --            --       (4,321,686)      (4,321,686)
                               ----------   -------   -----------   -----------     ---------     ------------     ------------
Balance at December 31,
  1997.......................   3,227,005     3,227    12,519,952    (1,582,320)     (569,061)     (16,820,742)      (6,448,944)
  Sale of common stock.......   2,456,275     2,456    16,231,301            --            --               --       16,233,757
  Conversion of redeemable
    convertible preferred
    stock to common stock....   7,754,933     7,755    23,122,213            --            --               --       23,129,968
  Repurchase of common
    stock....................     (39,012)      (39)      (11,793)           --            --               --          (11,832)
  Amortization of deferred
    compensation.............          --        --            --       441,636            --               --          441,636
  Repayment of notes
    receivable from
    stockholders.............          --        --            --            --       144,231               --          156,534
  Net loss...................          --        --                          --            --       (3,312,311)      (3,312,311)
                               ----------   -------   -----------   -----------     ---------     ------------     ------------
Balance at December 31,
  1998.......................  13,399,201   $13,399   $51,861,673   $(1,140,684)    $(424,830)    $(20,133,053)    $ 30,176,505
                               ==========   =======   ===========   ===========     =========     ============     ============
</TABLE>
 
                            See accompanying notes.
 
                                       F-5
<PAGE>   39
 
                                COMBICHEM, INC.
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                     YEAR ENDED DECEMBER 31,
                                            -----------------------------------------
                                                1996          1997           1998
                                            ------------   -----------   ------------
<S>                                         <C>            <C>           <C>
Cash flows from operating activities:
  Net loss................................  $ (5,118,427)  $(4,321,686)  $ (3,312,311)
  Adjustments to reconcile net loss to net
     cash used in operating activities:
     Depreciation of property and
       equipment..........................       310,765       849,285      1,671,681
     Amortization of premium on short-term
       investments........................            --        92,707        149,663
     Deferred rent........................        30,409        60,818         50,544
     Deferred revenue.....................     2,130,000      (654,248)     1,717,229
     Amortization of deferred
       compensation.......................            --       191,653        441,636
     Interest payable converted to
       preferred stock....................        20,913            --             --
     Change in operating assets and
       liabilities:
       Accounts receivable................      (198,419)     (329,214)    (2,364,348)
       Prepaid expenses and other current
          assets..........................      (154,152)     (422,366)      (400,708)
       Accounts payable and accrued
          liabilities.....................       607,106     1,032,345        121,539
                                            ------------   -----------   ------------
Net cash used in operating activities.....    (2,371,805)   (3,500,706)    (1,925,075)
Cash flows from investing activities:
  Purchases of short-term investments.....   (12,166,132)   (6,191,204)   (11,619,652)
  Maturities of short-term investments....            --     7,416,825     13,500,000
  Purchases of accrued interest on
     short-term investments...............            --      (206,913)      (141,878)
  Purchases of property and equipment.....    (2,575,690)   (3,911,307)    (3,612,049)
  Deposits and other assets...............      (102,077)     (741,750)       641,598
  Notes receivable from employees.........       (66,125)       12,688         56,303
                                            ------------   -----------   ------------
Net cash used in investing activities.....   (14,910,024)   (3,621,661)    (1,175,678)
Cash flows from financing activities:
  Advances on capital lease obligations...     2,337,375     3,257,645      3,096,873
  Principal repayments on capital lease
     obligations..........................      (410,876)     (915,816)    (1,877,710)
  Issuance of common stock................        22,200    10,072,719     16,233,757
  Repurchase of common stock..............        (5,865)           --        (11,832)
  Issuance of redeemable convertible
     preferred stock, net of issuance
     costs................................    12,995,390        23,240             --
  Payments on note payable................      (100,000)           --             --
  Receipt of payment on notes receivable
     from stockholders....................            --       121,374        144,231
  Restricted cash given as collateral for
     letter of credit.....................      (325,000)       62,857        (17,000)
                                            ------------   -----------   ------------
Net cash provided by financing
  activities..............................    14,513,224    12,622,019     17,568,319
                                            ------------   -----------   ------------
Net increase (decrease) in cash and cash
  equivalents.............................    (2,768,605)    5,499,652     14,467,566
Cash and cash equivalents at beginning of
  year....................................     3,135,588       366,983      5,866,635
                                            ------------   -----------   ------------
Cash and cash equivalents at end of
  year....................................  $    366,983   $ 5,866,635   $ 20,334,201
                                            ============   ===========   ============
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
  INFORMATION:
Interest paid.............................  $    124,266   $   258,109   $    522,521
                                            ============   ===========   ============
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING
  AND FINANCING ACTIVITIES:
Conversion of convertible notes payable
  and interest payable to redeemable
  convertible preferred stock.............  $    440,000   $        --   $         --
                                            ============   ===========   ============
</TABLE>
 
                            See accompanying notes.
                                       F-6
<PAGE>   40
 
                                COMBICHEM, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1998
 
 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Organization and Business
 
     CombiChem, Inc. is a computational product discovery company that is
applying its proprietary design technology and rapid synthesis capabilities to
accelerate the discovery process for new drugs and chemical products. The
Company believes its approach offers pharmaceutical and chemical companies the
opportunity to conduct their discovery efforts in a more productive and
cost-effective manner. Using its Discovery Engine(TM) process, the Company
focuses on the generation, evolution and optimization of potential new lead
candidates for its collaborative partners, who will then develop, manufacture,
market and sell any resulting products. CombiChem believes that its process is
widely applicable to a variety of disease targets and therapeutic indications as
well as to other industries such as agrochemical, industrial chemical and
materials science. In addition, the Company is using its approach on internal
programs to discover new lead candidates that will then be out licensed to third
parties, retaining a larger economic interest in such candidates.
 
  Cash, Cash Equivalents and Short-term Investments
 
     Cash and cash equivalents consist of cash and highly liquid investments
with maturities of three months or less when purchased. Short-term investments
are recorded at amortized cost which approximates market value.
 
     The Company applies Statement of Financial Accounting Standards No. 115,
Accounting for Certain Investments in Debt and Equity Securities (SFAS No. 115),
to its investments. Under SFAS No. 115, the Company classifies its short-term
investments as "Available-for-Sale" and records such assets at estimated fair
value in the balance sheet, with unrealized gains and losses, if any, reported
in stockholders' equity. As of December 31, 1998, the cost of cash equivalents
and short-term investments approximated fair market value.
 
  Concentration of Credit Risk
 
     The Company invests its excess cash in debt instruments of financial
institutions and corporations with strong credit ratings. The Company has
established guidelines relative to diversification and maturities that maintain
safety and liquidity. The Company historically has not experienced any material
losses on its cash equivalents or short-term investments.
 
  Property and Equipment
 
     Property and equipment are carried at cost. Depreciation of equipment is
computed using the straight-line method over the estimated useful lives of the
assets, generally three to seven years. Leasehold improvements are amortized
over the shorter of the estimated useful lives of the assets or the remaining
term of the lease. Amortization of equipment under capital leases is reported
with depreciation of property and equipment.
 
  Impairment of Long-Lived Assets
 
     Statement of Financial Accounting Standards No. 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of
(SFAS No. 121), requires impairment losses to be recorded on long-lived assets
used in operations when indicators of impairment are present and the
undiscounted cash flows estimated to be generated by those assets are less than
the assets' carrying amount. SFAS No. 121 also addresses the accounting for
long-lived assets that are expected to be disposed. To date there have been no
such indicators of impairments.
 
  Basic Net Loss Per Share
 
     Effective December 31, 1997, the Company adopted Statement of Financial
Accounting Standards No. 128 Earnings Per Share ("SFAS No. 128"). SFAS No. 128
requires the
 
                                       F-7
<PAGE>   41
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
presentation of basic earnings (loss) per share and diluted earnings (loss) per
share, if more dilutive, for all periods presented.
 
     In accordance with SFAS No. 128, Earnings Per Share and Securities and
Exchange Commission Staff Accounting Bulletin No. 98, basic net loss per share
has been computed using the weighted-average number of shares of Common Stock
outstanding during the period.
 
  Basic Net Loss Per Share
 
     A reconciliation of shares used in the calculation of basic net loss per
share follows (in thousands, except per share data):
 
<TABLE>
<CAPTION>
                                                 YEARS ENDED DECEMBER 31,
                                               -----------------------------
                                                1996       1997       1998
                                               -------    -------    -------
<S>                                            <C>        <C>        <C>
Net loss.....................................  $(5,118)   $(4,322)   $(3,312)
                                               =======    =======    =======
Weighted average shares of Common Stock
  outstanding (shares used in computing basic
  net loss per share)........................      453        971      9,140
                                               =======    =======    =======
Basic and diluted net loss per share.........  $(11.30)   $ (4.45)   $ (0.36)
                                               =======    =======    =======
</TABLE>
 
     The diluted EPS computation is the same as basic because all potential
common shares are antidilutive.
 
  New Accounting Standards
 
     In 1998, the Company adopted Statement of Financial Accounting Standards
No. 130, Reporting Comprehensive Income (SFAS No. 130) and Statement of
Financial Accounting Standards No. 131, Segment Information (SFAS No. 131). SFAS
No. 130 requires that all components of comprehensive income, including net
income, be reported in the financial statements in the period in which they are
recognized. Comprehensive income is defined as the change in equity during a
period from transactions and other events and circumstances from non-owner
sources. Net income and other comprehensive income, including foreign currency
translation adjustments, and unrealized gains and losses on investments, shall
be reported, net of their related tax effect, to arrive at comprehensive income.
Comprehensive loss was the same as net loss.
 
     SFAS No. 131 amended the requirements for public enterprises to report
financial and descriptive information about its reportable operating segments.
Operating segments, as defined in SFAS No. 131, are components of an enterprise
for which separate financial information is available and is evaluated regularly
by the Company in deciding how to allocate resources and in assessing
performance. The financial information is required to be reported on the basis
that is used internally for evaluating the segment performance. The Company
believes it operates in one business and operating segment and accordingly,
adoption of this standard did not have an impact on the Company's financial
statements.
 
  Revenues under Collaborative Agreements and Research and Development Costs
 
     The Company currently generates revenue primarily through its collaborative
agreements. Contract research revenue is recognized as research activities are
performed under the terms of the research contracts. Contract payments are
generally received in advance of the performance of the related research
activities. Such payments received in excess of amounts earned are recorded as
deferred revenue.
 
     Project initiation fees are recognized as revenue upon contract execution.
These fees are nonrefundable and the Company has no future performance
obligations related to such fees.
 
     Research and development costs are expensed as incurred. Costs of services
under the Company's collaborative agreements generally approximate the research
revenue under such agreements. Project initiation fees and milestone payments do
not have associated cost of services.
 
                                       F-8
<PAGE>   42
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
     The Company's accounts receivable consist primarily of payments due under
these agreements. Substantially all of such receivables are collected within 30
days of the balance sheet date.
 
     The Company's revenues are concentrated among a small number of customers,
as follows:
 
<TABLE>
<CAPTION>
                                                    YEARS ENDED
                                                    DECEMBER 31,
                                                --------------------
                                                1996    1997    1998
                                                ----    ----    ----
<S>                                             <C>     <C>     <C>
Novartis......................................   --      --       *
Elan/Athena...................................   --      18%     14%
ICOS..........................................   --      --       *
ImClone.......................................   --       *       *
Roche.........................................   67%     30%     38%
Sumitomo......................................   31%     39%     17%
Teijin........................................   --       *       *
Ono...........................................   --      --      12%
</TABLE>
 
- ---------------
* Amount earned represents less than 10% of revenues for the period.
 
  Stock-Based Compensation
 
     As permitted by Statement of Financial Accounting Standards No. 123 (SFAS
No. 123), the Company has elected to follow Accounting Principles Board Opinion
No. 25, Accounting for Stock Issued to Employees (APB 25), and related
Interpretations in accounting for its employee stock options. Under APB 25, when
the exercise price of the Company's employee stock options is not less than the
market price of the underlying stock on the date of grant, no compensation
expense is recognized. Options granted to consultants and non-employees are
measured at fair value in accordance with SFAS No. 123 and are expensed over the
period the related services are rendered.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
  Reclassification
 
     Reclassifications have been made to certain prior period amounts to conform
to the 1998 presentation.
 
 2. BALANCE SHEET INFORMATION
 
  Investments
 
     There were no realized gains or losses on the sale of securities during the
three years ended December 31, 1998.
 
The Company's short-term investments classified as available-for-sale are as
follows:
 
<TABLE>
<CAPTION>
                                         DECEMBER 31,
                                   -------------------------
                                      1997           1998
                                   -----------    ----------
<S>                                <C>            <C>
Corporate bonds..................  $10,555,534    $9,024,714
Tax exempt municipal bonds.......      499,191            --
                                   -----------    ----------
                                   $11,054,725    $9,024,714
                                   ===========    ==========
</TABLE>
 
                                       F-9
<PAGE>   43
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 2. BALANCE SHEET INFORMATION (CONTINUED)
     The Company has one debt security, with a value of $3,000,000, with a
contractual maturity in the year 2000. All other debt securities held by the
Company at December 31, 1998 have a contractual maturity less than one year. The
amortized cost of the debt securities approximates fair value. Actual maturities
may differ from contractual maturities because the issuers of the securities may
have the right to prepay obligations without prepayment penalties.
 
  Property and Equipment
 
     Property and equipment consist of the following:
 
<TABLE>
<CAPTION>
                                         DECEMBER 31,
                                  --------------------------
                                     1997           1998
                                  -----------    -----------
<S>                               <C>            <C>
Laboratory and computer
  equipment.....................  $ 4,131,762    $ 7,299,758
Leasehold improvements..........    2,524,919      3,042,052
Office furniture, fixtures and
  equipment.....................      576,255        503,175
                                  -----------    -----------
                                    7,232,936     10,844,985
Less accumulated depreciation
  and amortization..............   (1,271,759)    (2,943,440)
                                  -----------    -----------
                                  $ 5,961,177    $ 7,901,545
                                  ===========    ===========
</TABLE>
 
 3. COMMITMENTS
 
  Leases
 
     The Company leases its facilities in San Diego and Palo Alto under two
operating lease agreements that expire in May 2006 and October 2002,
respectively. Rent expense was approximately $383,000, $613,000 and $713,000 for
the years ended December 31, 1996, 1997 and 1998, respectively. Lease payments
under both agreements are subject to future increases based upon the terms of
the lease agreements.
 
     The Company leases certain equipment under capital lease obligations. Cost
and accumulated amortization of equipment under capital leases were $6,599,000
and $1,140,000 at December 31, 1997 and $9,697,000 and $2,740,000 at December
31, 1998, respectively.
 
     Annual future minimum obligations for operating and capital leases as of
December 31, 1998 are as follows:
 
<TABLE>
<CAPTION>
       YEAR ENDING DECEMBER 31:         OPERATING LEASES    CAPITAL LEASES
       ------------------------         ----------------    --------------
<S>                                     <C>                 <C>
     1999.............................     $  683,341         $2,759,275
     2000.............................        699,778          2,109,571
     2001.............................        712,106          1,736,497
     2002.............................        682,799            299,998
     2003.............................        480,786                 --
     Thereafter.......................      1,263,944                 --
                                           ----------         ----------
Total minimum lease payments..........     $4,522,754          6,905,341
                                           ==========
Less amount representing interest.....                           833,608
                                                              ----------
Present value of obligations under
  capital leases......................                         6,071,733
Less current portion..................                         1,825,279
                                                              ----------
Long-term obligations under capital
  leases..............................                        $4,246,454
                                                              ==========
</TABLE>
 
                                      F-10
<PAGE>   44
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 4. STOCKHOLDERS' EQUITY (DEFICIT)
 
  Initial Public Offering
 
     In May 1998, the Company completed the sale of 2,359,500 shares of common
stock (including partial exercise of underwriters' over-allotment option) in its
initial public offering, for net proceeds of $16.2 million. In conjunction with
the offering, the Company reincorporated from California to Delaware, effected a
one-for-four reverse stock split of its common stock and all outstanding
preferred shares were converted into common stock on a one-for-four basis. All
share and per share amounts and stock option data have been restated to
retroactively give effect to the reverse stock split and the related change in
shares outstanding.
 
  1997 Stock Incentive Plan
 
     The Company's 1997 Stock Incentive Plan (the 1997 Plan) serves as the
successor equity incentive program to the Company's 1995 Plan. The 1997 Plan was
adopted by the Board of Directors and the stockholders on October 7, 1997 and
became effective upon completion of the initial public offering. A total of
1,072,170 shares of Common Stock have been authorized for issuance under the
1997 Plan. Under the 1997 Plan, options may be designated as incentive stock
options or nonstatutory stock options. Options under the 1997 Plan have a term
of up to 10 years from the date of grant. The exercise price of options shall be
fixed by the Board of Directors, but shall not be less than 100% of the fair
market value per share of common stock on the option grant dates.
 
     Under the 1997 Plan, selected employees, directors and consultants may be
issued shares of common stock at no less than 100% of the fair market value on
the date of grant. The vesting schedule for each option grant is determined by
the Board of Directors.
 
  1997 Stock Incentive Plan
 
     Information with respect to the 1995/1997 Plans is as follows:
 
<TABLE>
<CAPTION>
                                                           WEIGHTED-
                                                            AVERAGE
                                             SHARES      EXERCISE PRICE
                                           ----------    --------------
<S>                                        <C>           <C>
  Granted................................     562,980        $0.30
  Exercised..............................          --           --
  Cancelled..............................          --           --
                                           ----------
Balance at December 31, 1995.............     562,980        $0.30
  Granted................................     531,479        $0.30
  Exercised..............................     (72,589)       $0.30
  Cancelled..............................     (12,536)       $0.30
                                           ----------
Balance at December 31, 1996.............   1,009,334        $0.30
  Granted................................     721,543        $2.79
  Exercised..............................  (1,210,310)       $0.45
  Cancelled..............................     (32,471)       $0.34
                                           ----------
Balance at December 31, 1997.............     488,096        $3.56
  Granted................................     284,694        $6.26
  Exercised..............................     (16,774)       $0.49
  Cancelled..............................      (7,360)       $0.66
                                           ----------
Balance at December 31, 1998.............     748,656        $4.68
                                           ==========
</TABLE>
 
     At December 31, 1998, options to purchase 103,244 shares were vested and
338,464 shares remain available for grant. All options are exercisable when
issued, and are subject to repurchase if certain vesting requirements aren't
met.
 
                                      F-11
<PAGE>   45
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 4. STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)
     Following is a further breakdown of the options outstanding as of December
31, 1998:
 
<TABLE>
<CAPTION>
                                                                                               WEIGHTED-
                                                                                                AVERAGE
                                                                 WEIGHTED-                     EXERCISE
                                                 WEIGHTED         AVERAGE                      PRICE OF
                                                  AVERAGE         EXERCISE        VESTED        VESTED
                                                 REMAINING         PRICE        OUTSTANDING   OUTSTANDING
                                   OPTIONS        LIFE IN        OF OPTIONS       OPTIONS       OPTIONS
   RANGE OF EXERCISE PRICES      OUTSTANDING       YEARS        OUTSTANDING     EXERCISABLE   EXERCISABLE
   ------------------------      -----------   -------------    -----------     -----------   -----------
<S>                              <C>           <C>             <C>              <C>           <C>
$0.30 - $0.40..................     66,193         7.18            $0.332          37,347       $0.352
$1.00..........................     26,485         8.55            $1.000           8,658       $1.000
$2.00 - $3.00..................     16,875         6.81            $2.741          10,742       $2.864
$4.00 - $5.00..................    421,653         5.69            $4.152          34,747       $4.449
$6.00 - $8.00..................    217,450         9.26            $7.623          11,750       $8.000
                                   -------                                        -------
                                   748,656         6.99            $4.679         103,244       $2.916
                                   =======                                        =======
</TABLE>
 
     Pro forma information regarding net loss and net loss per share is required
by SFAS No. 123 and has been determined as if the Company had accounted for its
employee stock options and stock purchase plan under the fair value method of
SFAS No. 123. The fair value for these options was estimated at the date of
grant using the "Minimum Value" method for option pricing with the following
assumptions for 1996, 1997 and through May 6, 1998: risk-free interest rates of
6.50%, dividend yield of 0%, and a weighted-average expected life of the options
of five years; and from May 7, 1998 through December 31, 1998: risk free
interest rates of 5.65%, dividend yield of 0%, volatility of .65, and a
weighted-average expected life of the options of five years.
 
     For purposes of pro forma disclosures, the estimated fair value of the
options are amortized to expense over the vesting period. The Company's adjusted
pro forma information is as follows:
 
<TABLE>
<CAPTION>
                                             YEAR ENDED DECEMBER 31,
                                    -----------------------------------------
                                       1996           1997           1998
                                    -----------    -----------    -----------
<S>                                 <C>            <C>            <C>
Pro forma net loss................  $(5,137,253)   $(4,376,686)   $(3,354,245)
Pro forma basic net loss per
  share...........................  $    (11.34)   $     (4.51)   $     (0.37)
</TABLE>
 
     The weighted-average fair value of options granted during 1996, 1997 and
1998 was $0.08, $0.72 and $0.79, respectively. The pro forma effect on net loss
is not likely to be representative of the pro forma effects on reported net
income or loss in future years because these amounts reflect less than four
years of vesting.
 
     The 1997 Employee Stock Purchase Plan (the "Purchase Plan") was adopted by
the Board of Directors and the stockholders on October 7, 1997 and became
effective upon completion of the initial public offering. A total of 150,000
shares of Common Stock have been authorized for issuance under the Purchase
Plan. The Purchase Plan permits eligible employees of the Company to purchase
shares of Common Stock, at semi-annual intervals, through periodic payroll
deductions. Payroll deductions may not exceed 10% of the participant's base
salary, and the purchase price will not be less than 85% of the lower of the
fair market value of the stock at either the beginning or the end of the
semi-annual intervals.
 
  Warrants
 
     As of December 31, 1998, the Company has issued warrants to purchase an
aggregate of 130,728 shares of common stock at prices ranging from $2.00 to
$2.48 per share. The warrants are exercisable in whole or in part through
various dates. The Company also has issued warrants to purchase 8,750 shares of
common stock at $0.30 per share. The warrants are exercisable in whole or in
part at any time at or prior to June 2000.
 
 5. NOTES RECEIVABLE FROM STOCKHOLDERS
 
     During 1995, the Company loaned $150,000 to an employee and stockholder for
the purchase of a residence in connection with the individual's employment
agreement. The note bears interest
 
                                      F-12
<PAGE>   46
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 5. NOTES RECEIVABLE FROM STOCKHOLDERS (CONTINUED)
at approximately 5.8% and matures on the earlier of (i) April 30, 2000, (ii) 30
days following cessation of employment, (iii) the date on which more than 50% of
the Company's outstanding shares of common stock are acquired by a single
purchaser or a group of purchasers (iv) the Company merges with or into another
organization, or (v) 10 days following the date on which the Maker sells or
transfers the Maker's real property. The note is secured by 87,500 shares of the
Company's common stock owned by the employee at the date of the note, plus any
capital stock thereafter acquired.
 
     In August 1996, the Company loaned $66,125 to an employee for relocation in
connection with employment, which is secured by a deed of trust on the
employee's residence. The loan was paid in full in December 1998.
 
     During 1997, the Company instituted an employee loan program whereby the
proceeds of full-recourse employee loans are used to purchase common stock from
the exercise of the employee's stock options. Under the program, the employee
pays 25% of the total exercise price, and the Company loans the employee the
remaining 75% of the purchase price. The loans bear interest at an adjustable
rate that is the minimum rate allowable by the Internal Revenue Service, subject
to quarterly adjustments by the Company. The loans will be repaid through 3
equal payments on the first three anniversary dates of the loan. The Company has
$262,527 in loans outstanding as of December 31, 1998 and $419,061 outstanding
at December 31, 1997, respectively.
 
 6. COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENTS
 
  Athena Neurosciences, Inc., a wholly owned subsidiary of Elan Corporation, plc
 
     In October 1997, the Company entered into a collaborative agreement with
Athena Neurosciences, Inc. (Elan/Athena), a wholly owned subsidiary of Elan
Corporation, plc providing for a three-year program to discover novel
therapeutic compounds for treatment of central nervous system conditions. The
first project was initiated upon signing of this collaboration agreement, with a
second project initiated in March 1998. The agreement provides for Elan/Athena's
access to the Universal Informer Library as deemed necessary by the research
management committee composed of representatives of the Company and Elan/Athena.
Under the agreement, Elan/ Athena paid a project initiation fee and agreed to
provide research funding and milestone payments upon the achievement of
pre-determined objectives. Elan/Athena will also make royalty payments on
worldwide sales of products resulting from the collaboration. The agreement may
be terminated by either party 90 days following an uncured material breach or by
Elan/Athena after the one-year anniversary upon 90 days prior written notice. In
connection with the collaborative agreement, Elan International Services Ltd.,
an affiliate of Elan/Athena, purchased 1,000,000 shares of Common Stock for $8.0
million in October 1997. In addition, the same affiliate acquired 250,000 shares
of common stock in the initial public offering.
 
  ICOS Corporation
 
     In March 1998, the Company entered into a collaborative agreement with ICOS
Corporation (ICOS) providing for a lead evolution project on an undisclosed
target. Under the agreement, ICOS received exclusive global rights to develop
and market any products resulting from the collaboration. ICOS made an advance
payment in April 1998 and agreed to pay research support funding, payments upon
achievement of certain clinical milestones and royalty payments on any product
sales. The lead evolution project terminates on August 31, 2000. The agreement
may be terminated by either party 90 days following an uncured material breach.
 
  ImClone Systems Incorporated
 
     In October 1997, the Company entered into a collaborative agreement with
ImClone Systems Incorporated (ImClone) providing for a two-year program to
identify and characterize novel small molecule inhibitors to multiple targets
for development in oncology. The agreement provides for
 
                                      F-13
<PAGE>   47
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 6. COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENTS (CONTINUED)
ImClone's access to the Company's Universal Informer Library and Virtual
Library. Under the terms of the agreement, ImClone agreed to provide the Company
research support payments, milestone payments upon the achievement of certain
program objectives and royalties on worldwide product sales of therapeutic
products that may arise out of the collaboration. The agreement may be
terminated by either party 90 days following an uncured material breach. In
connection with the collaborative agreement, ImClone purchased 312,500 shares of
Common Stock for $2.0 million.
 
  Novartis Crop Protection AG
 
     In May 1998, the Company entered into a collaborative agreement with
Novartis Crop Protection AG (Novartis) providing for a two-year lead
optimization project for the herbicide, fungicide and insecticide markets. Under
the agreement, Novatris paid a project initiation fee and agreed to provide
research funding and milestone payments upon the achievement of certain
milestones. Novartis has exclusive global rights to develop and market or
sub-license products resulting from the collaboration. The Company will be
entitled to royalties on sales of products resulting from the collaboration. The
agreement may be terminated by either party 90 days following an uncured
material breach.
 
  Ono Pharmaceutical Co., Ltd.
 
     In December 1998, the Company entered into a collaborative agreement with
Ono Pharmaceutical Co., Ltd. (Ono) providing for a two-year lead generation
research program on an undisclosed target. Under the agreement, Ono paid a
project initiation fee and agreed to provide research funding and milestone
payments upon the achievement of certain milestones. Ono will make royalty
payments on worldwide sales of products resulting from the collaboration. The
agreement may be terminated by either party 90 days following an uncured
material breach.
 
  Roche Bioscience, a division of Syntex (U.S.A.) Inc.
 
     In October 1996, the Company entered into a collaborative agreement with
Roche Bioscience providing for a broad two-year program to perform research
against three initial targets, including a protein-protein interaction, an
enzyme and a receptor, with an option to add additional targets. Roche
Bioscience can elect one of the approaches -- lead generation, lead evolution or
lead optimization -- for each research program against each collaboration
target. A program may be initiated at any time during the term of the
collaboration, thereby extending the term to allow for completion of each
program. Under the agreement, Roche Bioscience paid a project initiation fee to
the Company and agreed to provide research funding and to make milestone
payments upon the achievement of certain milestones. Roche Bioscience will make
royalty payments on worldwide sales of products resulting from the
collaboration.
 
  Sumitomo Pharmaceuticals Co., Ltd.
 
     In August 1997, the Company entered into a collaborative agreement with
Sumitomo Pharmaceuticals Co. Ltd. (Sumitomo) providing for a two-year lead
evolution program on a target that is believed to play a fundamental role in
osteoarthritis and rheumatoid arthritis. Under the agreement, Sumitomo paid a
project initiation fee and agreed to provide research funding and milestone
payments upon the achievement of certain milestones. Sumitomo will make royalty
payments on worldwide sales of products resulting from the collaboration.
Sumitomo may extend the research period for up to four successive six-month
periods upon mutual agreement. The agreement may be terminated by either party
90 days following an uncured material breach.
 
  Teijin Limited
 
     In March 1996, the Company entered into a collaborative agreement with
Teijin Limited (Teijin) providing for a one-year program on a G-protein coupled
receptor target. In March 1997, the Company and Teijin amended their agreement
to extend the collaboration for an additional
                                      F-14
<PAGE>   48
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
 6. COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENTS (CONTINUED)
year. While the initial focus of the collaboration was lead optimization, the
effort was redirected to lead evolution during the course of the research.
 
     Under the agreement, Teijin paid a project initiation fee to the Company
and agreed to provide research funding and milestone payments upon the
achievement of certain milestones. Teijin also committed internal resources to
the discovery effort. Teijin will make royalty payments on products resulting
from the collaboration. The Company retains the rights to the compounds arising
under this collaboration in North and South America; Teijin has rights to these
compounds in Asia and Europe with a right of first negotiation to acquire the
Company rights. Under the original agreement, either party may terminate the
agreement in the event of a material breach remaining uncured for 60 days. As of
March 1998, the Company has successfully concluded its research phase and
delivered lead candidates to Teijin for further development. As this development
process continues, Teijin will make additional payments if certain milestones
are met.
 
  7. BENEFIT PLAN
 
     The Company sponsors a 401(k) plan which covers employees who meet certain
age and service requirements. Employees may contribute a portion of their
earnings each plan year subject to certain Internal Revenue Service limitations.
The Company made no discretionary contributions to the plan for the years ended
December 31, 1998 and 1997.
 
  8. INCOME TAXES
 
     At December 31, 1998, the Company had federal and California income tax net
operating loss carryforwards of approximately $18,319,000 and $17,074,000,
respectively.
 
     The federal and California tax loss carryforwards will begin to expire in
2009 and 2002, respectively, unless previously utilized. The Company also has
federal and California research tax credit carryforwards of approximately
$653,000 and $426,000, respectively, which will begin to expire in 2010 unless
previously utilized. The Company also has a federal foreign tax credit
carryforward of approximately $380,000, which will begin to expire in 2002
unless previously utilized.
 
     Pursuant to Sections 382 and 383 of the Internal Revenue Code, annual use
of the Company's net operating loss and credit carryforwards may be limited in
the event of cumulative changes in ownership of more than 50%. However, the
Company does not believe such limitation will have a material effect upon the
utilization of these carryforwards.
 
     Significant components of the Company's deferred tax assets are shown
below. A valuation allowance, which was increased by $1,602,000 in 1998, has
been recognized to offset the deferred tax assets as of December 31, 1998 and
1997 as realization of such assets is uncertain.
 
<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                                  --------------------------
                                                     1997           1998
                                                  -----------    -----------
<S>                                               <C>            <C>
Deferred tax assets:
  Net operating loss carryforwards..............  $ 6,325,000    $ 7,436,000
  Research and development credits..............      558,000        930,000
  Foreign tax credit............................      200,000        380,000
  Other, net....................................      240,000        179,000
                                                  -----------    -----------
Total deferred tax assets.......................    7,323,000      8,925,000
Valuation allowance for deferred tax assets.....   (7,323,000)    (8,925,000)
                                                  -----------    -----------
Net deferred tax assets.........................  $        --    $        --
                                                  ===========    ===========
</TABLE>
 
     The Company recorded foreign tax expense of $200,000 and $180,000 for the
years ended December 31, 1997 and 1998, respectively, for taxes payable to the
Japanese tax authority resulting from revenues under the Sumitomo and the Ono
collaborations, respectively.
 
                                      F-15
<PAGE>   49
                                COMBICHEM, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1998
 
  9. SUBSEQUENT EVENTS
 
     In March 1999, the Company entered into a new lease agreement for its San
Diego research and administrative facility with a target commencement date of
November 1, 1999. The new lease agreement is for a term of 15 years at
$2,295,000 per year subject to annual increases related to the Consumer Price
Index. The Company negotiated an agreement with the landlord of its current
facility to vacate the facility on terms which did not result in a financial
penalty or loss to the Company.
 
                                      F-16

<PAGE>   1
                                                                   EXHIBIT 10.62



                            AMENDED PROMISSORY NOTE


$48,000.00                                                     February 24, 1997
                                                     As Amended November 8, 1998
                                                           San Diego, California


         VICENTE ANIDO, JR., an individual resident of the State of California
("Obligor"), for value received, hereby promises to pay to the order of
COMBICHEM, INC., a Delaware corporation, or holder ("Payee"), in lawful money of
the United States at 9050 Camino Santa Fe, San Diego, California 92121, the
principal sum of Forty-Eight Thousand Dollars ($48,000.00).

        Unpaid principal of this Note shall bear no interest.

        All unpaid principal under this Note shall be due and payable on the
earlier of (a) February 23, 2002; (b) the expiration of the 60-day period
following the date the Obligor ceases for any reason to remain in the Service of
Payee (as defined in that certain Restricted Stock Purchase Agreement dated
February 24, 1997 between Obligor and Payee); or (c) the date on which Payee
completes the consummation of any corporate transaction in which (i) more than
fifty percent (50%) of the outstanding shares of common stock of Payee are
acquired by a single purchaser or by a group of purchasers acting in concert in
a merger or any other transaction and Obligor receives cash or publicly traded
securities in connection therewith; or (ii) all or substantially all of the
assets of Payee are acquired by a single purchaser or a group of purchasers
acting in concert and Obligor receives cash or publicly traded securities in
connection therewith.

        Nothing in this Note shall confer upon the Obligor any right to continue
in the Service of Payee (or its successors or subsidiaries) for any period of
specific duration.

        Upon payment in full of all principal payable hereunder, this Note shall
be surrendered to Obligor for cancellation.

        This Note may be transferred only upon surrender of the original Note
for registration of transfer, duly endorsed, or accompanied by a duly executed
written instrument of transfer in form satisfactory to Obligor. Thereupon, a new
note for like principal amount and interest will be issued to, and registered in
the name of, the transferee. Principal is payable only to the registered holder
of this Note.

        Obligor waives presentment, demand for performance, notice of
nonperformance, protest, notice of protest, and notice of dishonor. No delay on
the part of Payee in exercising any right hereunder shall operate as a waiver of
such right under this Note. This Note is being delivered in and shall be
construed in accordance with the laws of the State of California.
<PAGE>   2

        If the indebtedness represented by this Note or any part thereof is
collected at law or in equity or in bankruptcy, receivership or other judicial
proceedings or if this Note is placed in the hands of attorneys for collection
after default, Obligor agrees to pay, in addition to the principal and interest
payable hereon, reasonable attorneys' fees and costs incurred by Payee.

        Any payment shall be deemed made upon receipt by Payee.

        This Note is the Note referred to in that certain Pledge Agreement
("Pledge Agreement") dated February 24, 1997 between Obligor and Payee, as
amended, and is subject to the terms thereof. The Pledge Agreement, among other
things, contains provisions for acceleration of the maturity of this Note upon
the happening of any one or more of the stated "Events of Default" set forth
therein. OBLIGOR UNDERSTANDS THAT THIS IS A FULL RECOURSE PROMISSORY NOTE AND
THAT PAYEE MAY, AT ITS OPTION, PROCEED AGAINST ASSETS OF THE UNDERSIGNED OTHER
THAN ANY COLLATERAL UNDER THE PLEDGE AGREEMENT IN THE EVENT OF DEFAULT. OBLIGOR
ACKNOWLEDGES AND UNDERSTANDS THAT THE RULE 144 HOLDING PERIOD MAY BE TOLLED WITH
RESPECT TO ANY COMMON STOCK PLEDGED PURSUANT TO THE PLEDGE AGREEMENT.

        Obligor acknowledges and agrees that he has been provided the
opportunity and encouraged to consult with counsel of Obligor's own choosing
with respect to this Agreement, and that Brobeck, Phleger & Harrison LLP solely
represents the interests of the Payee.

        IN WITNESS WHEREOF, Obligor has duly executed this Note, as of the date
first above written.



                                             /s/  Vicente Anido, Jr.
                                           -------------------------------------
                                           Vicente Anido, Jr.



                                       2

<PAGE>   1
                                                                   EXHIBIT 10.63



                               AMENDMENT NO. 1 TO
                                PLEDGE AGREEMENT


        This Amendment No. 1 ("Amendment") to the Pledge Agreement dated
February 24, 1997 made by Vicente Anido in favor of CombiChem, Inc. (the
"Corporation"), as amended (the "Pledge Agreement"), is made as of this 8th day
of November, 1998.

                                    RECITALS

               WHEREAS, Mr. Anido has repaid one-half of the principal amount
due under that certain Promissory Note for Ninety-Six Thousand Dollars
($96,000.00) between the Corporation and Mr. Anido dated February 24, 1997 (the
"Anido Note");

               WHEREAS, Mr. Anido had previously pledged 1,280,000 shares of the
Common Stock of the Corporation (the "Pledged Shares") as collateral for the
Anido Note pursuant to that certain Pledge Agreement between the Corporation and
Mr. Anido dated as of February 24, 1997 (the "Pledge Agreement");

               WHEREAS, the Board has decided to release one-half of the Pledged
Shares;

               WHEREAS, the Board has determined the release of one-half of the
Pledged Shares upon the repayment of one-half of the Anido Note to be just and
reasonable to the Corporation.

               In consideration of the foregoing and the promises and covenants
contained herein and other good and valuable consideration, the receipt of which
is hereby acknowledged, the parties hereto agree as follows:

        1.     AMENDMENT TO THE PLEDGE AGREEMENT.

        a. Schedule 1 of the Pledge Agreement shall be amended in its entirety
to read as follows:

                                 PLEDGED SHARES

<TABLE>
<CAPTION>
                                         Shares of
                                      CombiChem, Inc.

Name and Address                        Common Stock                   Date of Issuance
- ----------------                        ------------                   ----------------
<S>                                     <C>                            <C>
Vicente Anido, Jr.                         640,000                     February 24, 1997
1621 Bayside Drive
Corona Del Mar, CA  92625
</TABLE>



                                      -1-
<PAGE>   2
                                                                   EXHIBIT 10.63

        2.     EFFECT OF AMENDMENT.


        Except as set forth above, the Pledge Agreement shall continue in full
force and effect.

        3.     COUNTERPARTS.

        This Amendment may be executed in any number of counterparts, each which
will be deemed an original, and all of which together shall constitute one
instrument.

        4.     SEVERABILITY.

               If one or more provisions of this Amendment are held to be
unenforceable under applicable law, such provision shall be excluded from this
Amendment and the balance of the Amendment shall be interpreted as if such
provision were so excluded and shall be enforceable in accordance with its
terms.

        5.     ENTIRE AGREEMENT.

               This Amendment, together with the Pledge Agreement, as amended,
constitutes the full and entire understanding and agreement between the parties
with regard to the subjects hereof and thereof.

        6.     GOVERNING LAW.

               This Amendment shall be governed by and construed under the laws
of the State of California as applied to agreements among California residents
entered into and to be performed entirely within California.


                       [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]



                                      -2-
<PAGE>   3

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


                                       COMBICHEM, INC., a Delaware corporation


                                       By:   /s/ Karin Eastham
                                          --------------------------------------
                                          Karin Eastham, Chief Financial Officer


                                        /s/ Vicente Anido
                                       -----------------------------------------
                                       Vicente Anido





                      [SIGNATURE PAGE TO AMENDMENT NO. 1 TO
                              THE PLEDGE AGREEMENT]

<PAGE>   1
                                                                  EXHIBIT 10.64



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

                  LIMITED LIABILITY COMPANY OPERATING AGREEMENT

                                       OF

                        CHIROCHEM DISCOVERY SERVICES LLC,

                     A CALIFORNIA LIMITED LIABILITY COMPANY

                                DECEMBER 1, 1998


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


NEITHER THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE
REGULATORY AUTHORITY HAS APPROVED OR DISAPPROVED THIS LIMITED LIABILITY COMPANY
OPERATING AGREEMENT OR THE LIMITED LIABILITY COMPANY MEMBERSHIP INTERESTS
("INTERESTS") PROVIDED FOR HEREIN. ANY REPRESENTATION TO THE CONTRARY IS
UNLAWFUL.

THE INTERESTS HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF
1933, AS AMENDED, INCLUDING THE RULES AND REGULATIONS THEREUNDER (THE
"SECURITIES ACT"), AND THE COMPANY IS UNDER NO OBLIGATION TO REGISTER THE
INTERESTS UNDER THE SECURITIES ACT IN THE FUTURE.

AN INTEREST MAY NOT BE SOLD, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED IN
THE ABSENCE OF AN EFFECTIVE REGISTRATION UNDER THE SECURITIES ACT OR AN OPINION
OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.
ADDITIONAL RESTRICTIONS ON THE TRANSFER OF INTERESTS ARE CONTAINED IN ARTICLE XI
OF THIS AGREEMENT. BASED UPON THE FOREGOING, EACH ACQUIRER OF AN INTEREST MUST
BE PREPARED TO BEAR THE ECONOMIC RISK OF INVESTMENT THEREIN FOR AN INDEFINITE
PERIOD OF TIME.





*** Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the Act.

<PAGE>   2

                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
ARTICLE I FORMATION OF LIMITED LIABILITY COMPANY...............................1
        1.1    Formation.......................................................1
        1.2    Name and Principal Place of Business............................1
        1.3    Office for Records and Agent for Service of Process.............1
        1.4    Agreement.......................................................1
        1.5    Purposes........................................................1
        1.6    Definitions.....................................................2
        1.7    Term............................................................2

ARTICLE II MEMBERSHIP; UNITS...................................................3
        2.1    Members.........................................................3
        2.2    Representations and Warranties..................................3
        2.3    Units...........................................................4
        2.4    Substitute Members..............................................4
        2.5    Resignation or Withdrawal of a Member...........................4
        2.6    Dissociation of a Member........................................5
        2.7    Rights of Dissociated Member....................................5
        2.8    No Contracts....................................................5
        2.9    Other Ventures and Activities...................................5
        2.10   Member Expenses.................................................6
        2.11   Member Compensation.............................................6
        2.12   Tax Matters.....................................................6

ARTICLE III CONTRIBUTIONS TO CAPITAL...........................................7
        3.1    Capital Commitments.............................................7
        3.2    Capital Contributions...........................................7
        3.3    Issuance of Units...............................................7
        3.4    Additional Contributions and Loans..............................7
        3.5    Interest........................................................8
        3.6    Failure To Make Capital Contribution............................8

ARTICLE IV ACTION BY MEMBERS...................................................9
        4.1    Meetings of Members.............................................9
        4.2    Voting Standard.................................................9
</TABLE>



                                      -i-
<PAGE>   3

                                TABLE OF CONTENTS
                                   (CONTINUED)


<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
ARTICLE V MANAGEMENT; RESTRICTIONS; EXPENSES..................................9 
        5.1    Management by Board of Managers................................9 
        5.2    Number; Vacancies..............................................10
        5.3    Meetings of Managers...........................................10
        5.4    Voting Procedures..............................................11
        5.5    Action Without Meeting.........................................12
        5.6    Normal Functions of Board of Managers..........................12
        5.7    Conflict of Interest Matters...................................13
        5.8    Loss of Vote...................................................13
        5.9    Manager Compensation and Expenses..............................14

ARTICLE VI NOTICES............................................................14
        6.1    Notices........................................................14
        6.2    Waiver of Notice...............................................14

ARTICLE VII OFFICERS..........................................................15
        7.1    Chair..........................................................15
        7.2    Other Officers.................................................15
        7.3    Contracts......................................................15

ARTICLE VIII ACCOUNTING AND RECORDS...........................................16
        8.1    Financial Statements and Records...............................16
        8.2    Inspection of Books............................................16
        8.3    Annual and Monthly Reports.....................................16
        8.4    Tax Returns....................................................16

ARTICLE IX ALLOCATIONS........................................................17
        9.1    Allocation of Net Income or Net Loss...........................17
        9.2    Partnership Status.............................................17

ARTICLE X DISTRIBUTIONS.......................................................17
        10.1   Allocation of Distributions among Holders of Units.............17
        10.2   Discretionary Distributions....................................17
        10.3   No Other Withdrawals...........................................17
</TABLE>



                                      -ii-
<PAGE>   4

                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
ARTICLE XI TRANSFERS..........................................................18
        11.1   Transfer of Units..............................................18
        11.2   Transfer Void..................................................18
        11.3   Transfer of Control of Member..................................18
        11.4   Transfer of Control of Affiliates..............................18
        11.5   Acquisition of ***.............................................19

ARTICLE XII BUY-SELL PROVISION................................................19
        12.1   Application....................................................19
        12.2   Procedures.....................................................19

ARTICLE XIII INDEMNIFICATION AND LIMITATION OF LIABILITY......................20
        13.1   Indemnification................................................20
        13.2   Limitation of Liability........................................22

ARTICLE XIV TERMINATION.......................................................22
        14.1   Termination....................................................22
        14.2   Continuance of the Company.....................................22
        14.3   Authority to Wind Up...........................................23
        14.4   Winding Up and Certificate of Cancellation.....................23
        14.5   Distribution of Assets.........................................23
        14.6   Effect of Termination..........................................24

ARTICLE XV DEFINITIONS........................................................24
        15.1   Definitions....................................................24

ARTICLE XVI DISPUTE RESOLUTION................................................28
        16.1   Board of Managers Deadlock.....................................28
        16.2   Arbitration....................................................29
</TABLE>



- ----------

        *** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.



                                     -iii-
<PAGE>   5


                                TABLE OF CONTENTS
                                  (Continued)

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
ARTICLE XVII MISCELLANEOUS....................................................29
        17.1   Amendment......................................................29
        17.2   Withholding Taxes..............................................29
        17.3   Publicity......................................................30
        17.4   Further Assurances.............................................30
        17.5   Construction...................................................30
        17.6   Time...........................................................30
        17.7   Headings.......................................................31
        17.8   Severability...................................................31
        17.9   Variation of Terms.............................................32
        17.10  Governing Law..................................................32
        17.11  Binding Effect.................................................32
        17.12  Entire Agreement...............................................32
        17.13  Counterparts...................................................32
</TABLE>



                                      -iv-
<PAGE>   6

                        CHIROCHEM DISCOVERY SERVICES LLC

                            LIMITED LIABILITY COMPANY
                               OPERATING AGREEMENT


        THIS LIMITED LIABILITY COMPANY OPERATING AGREEMENT, dated December 1,
1998, is by and between the persons listed on the signature page hereto as
members of ChiroChem Discovery Services LLC, a California limited liability
company (the "Company").

                                    ARTICLE I
                     FORMATION OF LIMITED LIABILITY COMPANY

        1.1 Formation. The Members have formed the Company pursuant to the
Beverly-Killea Limited Liability Company Act (as amended, the "Act") by causing
articles of organization ("Articles") for the Company to be filed with the
California Secretary of State and entering into this Agreement. By this
Agreement the Members intend to establish rules and regulations governing
ownership and control of the Company.

        1.2 Name and Principal Place of Business. Unless and until changed in
accordance with this Agreement and the Act, the name of the Company will be
"ChiroChem Discovery Services LLC". The principal place of business of the
Company shall be at 9050 Camino Santa Fe, San Diego, California or such other
place as the Board of Managers may hereafter designate.

        1.3 Office for Records and Agent for Service of Process. The Company
shall maintain an office at which shall be maintained the records required by
Section 17058 of the Act and an agent for service of process as required by
Section 17057 of the Act. The office at which shall be maintained the records
required by Section 17058 of the Act shall be the principal office of CombiChem,
9050 Camino Santa Fe, San Diego, California 92121, and the name and address of
the agent for service of process shall be Karin Eastham c/o CombiChem, 9050
Camino Santa Fe, San Diego, California 92121, or such other person and place as
the Board of Managers may hereafter designate.

        1.4 Agreement. For and in consideration of the mutual covenants herein
contained and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the Members executing this
Agreement hereby agree to the terms and conditions of this Agreement, as it may
from time to time be amended.

        1.5 Purposes. The purposes of the Company are:


<PAGE>   7

               (a) to use chiral templates made available to it pursuant to the
CT License, and the technology licensed to it pursuant to the Combi License, to
design, synthesize and market chemical libraries consisting of Chiral Compounds
to third parties;

               (b) to use chiral templates made available to it pursuant to the
CT License, and the technology licensed to it pursuant to the Combi License, to
design, synthesize and market customized chemical libraries consisting of Chiral
Compounds in response to third party purchase orders and specifications;

               (c) to use chiral templates made available to it pursuant to the
CT License, and the technology licensed to it pursuant to the Combi License, to
synthesize and market individual quantities of a Chiral Compound selected from
chemical libraries sold pursuant to paragraphs (a) or (b) to a maximum quantity
of ten (10) grams per lot; and

               (d) to engage in all other lawful activities helpful, necessary
or appropriate to maximize the ability of the Company to accomplish the
foregoing purposes.

        1.6 Definitions. Terms not otherwise defined in this Agreement shall
have the meanings set forth in Article XV.

        1.7 Term. The term of the Company shall commence on the Effective Date
and, unless the term of the Company is otherwise terminated pursuant to the
provisions of this Agreement, shall continue until the third calendar
anniversary of the Effective Date (the "Initial Term"). Such term may be
extended for additional periods of three (3) years by future amendment of this
Agreement signed by all Members prior to the expiration of the then current
term.



                                      -2-
<PAGE>   8

                                   ARTICLE II
                                MEMBERSHIP; UNITS

        2.1 Members. The initial Members of the Company are each of the two
Persons whose names are set forth on the initial signature page of this
Agreement, each of which is admitted as a Member upon execution and delivery of
this Agreement. Additional signature pages may hereafter be added by the Board
of Managers as appropriate to reflect the admission of Substitute Members in
accordance with the provisions of this Agreement but not otherwise.

        2.2 Representations and Warranties. Each Member hereby represents and
warrants to the Company and the other Member as follows:

               (a) Authorization. The Member is duly organized, validly
existing, and in good standing under the law of its jurisdiction of
organization; it has full power and authority to execute and enter into this
Agreement and to perform its obligations hereunder; and all actions necessary
for the due authorization, execution, delivery and performance by that Member of
this Agreement have been duly taken. This Agreement has been duly executed and
delivered by the Member and constitutes the legal obligation of the Member
enforceable in accordance with its terms.

               (b) Compliance with Other Instruments. The Member's
authorization, execution, delivery, and performance of this Agreement do not
conflict with or violate any law applicable to the Member or any other agreement
or arrangement to which such Member is a party or by which such Member or such
Member's assets is bound.

               (c) Purchase Entirely for Own Account. The Member is acquiring
such Member's interest in the Company for the Member's own account, not as a
nominee or agent, for investment purposes only and not with a view to or for the
resale, distribution, subdivision or fractionalization thereof. The Member has
no contract, present intention, understanding, undertaking, agreement or
arrangement of any kind with any Person to sell, transfer or pledge to any
Person such Member's interest or any part thereof, nor does such Member have any
plans to enter into any such agreement.

               (d) Investment Experience. The Member has such knowledge and
experience in financial and business matters to be capable of evaluating the
merits and risks of its investment in the Company, is able to bear the economic
risks of an investment in the Company, and is able, without materially impairing
its financial condition, to hold the Units (as hereinafter defined) for an
indefinite period of time and to suffer a complete loss of such investment.



                                      -3-
<PAGE>   9

               (e) Disclosure of Information. The Member is aware of the
Company's business affairs and financial condition and has acquired all of the
information about the Company it has requested from the Company and considers
necessary to reach an informed and knowledgeable decision to acquire an interest
in the Company.

               (f) Federal and State Securities Laws. The Member acknowledges
that the Units have not been registered under the Securities Act of 1933, as
amended (the "Securities Act") or any state securities laws, inasmuch as they
are being acquired in a transaction not involving a public offering, and under
such laws, may not be resold or transferred by the Member without appropriate
registration or the availability of an exemption from such requirements. In this
connection, the Member represents that he is familiar with Rule 144 promulgated
under the Securities Act, as presently in effect, and understands the resale
limitations imposed thereby and by the Securities Act. The Member is an
"accredited investor" within the meaning of Regulation D promulgated under the
Securities Act of 1933, as amended.

               (g) Brokers and Finders. The Member has not retained any
investment banker, broker or finder in connection with his, her or its
investment in the Company.

        2.3 Units. Ownership of the Company shall be divided into and
represented by one class of units of the Company (the "Units"). Each Unit shall
be entitled to one vote and to equal participation in the profits, losses,
capital and distributions of the Company, unless additional or different classes
of Units are established by the Board of Managers and approved by the Members.

        2.4 Substitute Members. A Substitute Member shall have all the rights
and powers and will be subject to all the restrictions and liabilities of the
Member who Transferred the Units.

        2.5 Resignation or Withdrawal of a Member. Except as specifically
provided below, and subject to the provisions on Transfer contained in Article
XI, no Member may resign, retire or withdraw from membership in the Company or
withdraw such Member's interest in the capital of the Company prior to the
dissolution and winding up of the Company.



                                      -4-
<PAGE>   10

        2.6 Dissociation of a Member. The Bankruptcy or Dissolution of a Member
(i) will cause such Member to be dissociated from the Company (a "Dissociated
Member"), (ii) will terminate the continued membership of such Member in the
Company, and (iii) will constitute a Dissolution Event and cause a dissolution
and winding up of the Company pursuant to Article XIV hereof except as expressly
provided therein to the contrary.

        2.7 Rights of Dissociated Member. In the event any Member becomes a
"Dissociated Member", the Dissociated Member (or such Member's legal
representative) shall be entitled to participate in the winding up of the
Company to the same extent as any other Member.

        2.8 No Contracts. Each Member hereby covenants not to use any actual or
apparent authority or power to bind the Company to any contract or commitment,
or to otherwise incur any liability to which the Company will be subject,
without the express authorization of the Board of Managers. Each Member hereby
agrees to indemnify and hold the Company and the other Member(s) harmless for
any loss, liability, expense, damage or injury suffered or sustained by the
Company and/or the other Members in consequence of such Member's exercise of
such actual or apparent authority or power to bind the Company in violation of
the restrictions set forth herein. Upon any material breach of a Member's
obligations under this Section, the Company shall have a right of offset against
all distributions under this Agreement payable to such Member (and all amounts
thereafter payable to such Member or any Affiliate of such Member under any
other contract binding on the Company) for amounts owed to the Company pursuant
to the indemnification described in the preceding sentence.

        2.9 Other Ventures and Activities.

               (a) The Members: (i) acknowledge that the Members and their
respective Affiliates are or may be involved in other research and development,
manufacturing, sales or business activities; and (ii) agree that each Member and
its Affiliates may engage for their own accounts and for the accounts of others
in any such ventures and activities, provided, however, that such ventures
and/or activities shall not violate the limitations on activities found in
Section 2.2 (Retained Rights) of the CT License or the CombiChem License (as
applicable). Except as otherwise required by fiduciary duties, (i) neither the
Company nor any Member shall have any right by virtue of this Agreement or the
existence of the Company in and to such ventures or activities or to the income
or profits derived therefrom, and (ii) the Members, their Affiliates, and other
related Persons shall have no duty or obligation to make any reports to the
Members or the Company with respect to any such ventures or activities.



                                      -5-
<PAGE>   11

               (b) Each Member acknowledges that the other Member(s) may be
prohibited from taking action for the benefit of the Company: (i) due to
confidential information acquired or obligations incurred in connection with an
outside activity permitted to such Member or its Affiliates under this Section
2.9; or (ii) in connection with activities undertaken prior to the Effective
Date. No Person shall be liable to the Company or any Member for any failure to
act for the benefit of the Company in consequence of a prohibition described in
the preceding sentence.

        2.10 Member Expenses. No Member shall be reimbursed for expenses
incurred on behalf of, or otherwise in connection with, the Company except to
the extent so provided in any Chiro Ancillary Agreement, Combi Ancillary
Agreement or this Section. All expenses reasonably incurred by a Member in
connection with the preparation, negotiation, execution and delivery of this
Agreement and the aforesaid Ancillary Agreements and otherwise in connection
with the formation of the Company shall be reimbursed by the Company upon
presentation of evidence of such expenses reasonably satisfactory to the Board
of Managers.

        2.11 Member Compensation. Except as provided in a Chiro Ancillary
Agreement or a Combi Ancillary Agreement, no Member shall be entitled to
compensation for services provided by such Member to, or for the benefit of, the
Company.

        2.12 Tax Matters.

               (a) CombiSub is hereby designated the "tax matters partner" of
the Company within the meaning of Section 6231(a)(7) of the Code. Except to the
extent specifically provided in the Code or the Treasury Regulations (or the
laws of other relevant taxing jurisdictions), the tax matters partner shall have
exclusive authority to act for or on behalf of the Company with regard to tax
matters, including the authority to make (or decline to make) any available tax
elections.

               (b) Except to the extent otherwise required by applicable law
(disregarding for this purpose any requirement that can be avoided through the
filing of an election or similar administrative procedure), the tax matters
partner shall cause the Company to take the position that the Company is a
"partnership" for federal, state and local income tax purposes and shall cause
to be filed with the appropriate tax authorities any elections or other
documents necessary to give due legal effect to such position. A Member shall
not file (and each Member hereby represents that it has not filed) any income
tax election or other document that is inconsistent with the Company's position
regarding its classification as a "partnership" for applicable federal, state
and local income tax purposes.

               (c) No Member shall file a notice with the United States Internal
Revenue Service under Section 6222(b) of the Code in connection with such
Member's



                                      -6-
<PAGE>   12

intention to treat an item on such Member's federal income tax return in a
manner which is inconsistent with the treatment of such item on the Company's
federal income tax return unless such Member has, not less than 30 days prior to
the filing of such notice, provided all Members with a copy of the notice and
thereafter in a timely manner provides such other information related thereto as
any such Member shall reasonably request.

               (d) Any Member entering into a settlement agreement with the
United States Department of the Treasury which concerns a Company item shall
notify all Members of such settlement agreement and its terms within 60 days
after the date thereof.

                                   ARTICLE III
                            CONTRIBUTIONS TO CAPITAL

        3.1 Capital Commitments. The required contributions to the capital of
the Company by each Member shall be those amounts of cash and/or property set
forth opposite such Member's name in the Annual Budgets (each such amount being
a "Capital Commitment"). Each Member's Capital Commitments represent, in the
aggregate, the maximum amount of cash and/or property that such Member has
agreed to contribute to the Company in accordance with the terms hereof, and no
Member shall be obligated to contribute cash and/or property to the Company in
any amount in excess of such Member's aggregated Capital Commitments. The
initial Members currently agree that the aggregate of all Capital Commitments
for the Initial Term shall not exceed *** for each Member without further
written agreement of the Members.

        3.2 Capital Contributions. Except to the extent provided to the contrary
in any Annual Budget, all Capital Contributions shall be in cash. The obligation
of a Member to satisfy each of its Capital Commitments shall be without
interest. The Members shall make Capital Contributions equal to 100 percent of
their respective Capital Commitments in the amounts and on the dates for Capital
Contributions set forth in the Annual Budgets.

        3.3 Issuance of Units. Each Member shall be promptly issued one Unit for
every One U.S. Dollar ($1.00) of Capital Contribution made by the Member.

        3.4 Additional Contributions and Loans. Except as set forth in Section
3.6, and except if the Members mutually agree to fund the activities of the
Company through loans rather than Capital Contributions, no Member shall be
permitted or required to make any additional contribution to the capital of the
Company without the consent of the Board of Managers and the Members. No Member
shall lend, or be required to lend, any money to the Company or guaranty any
Company indebtedness unless all Members agree



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                                      -7-
<PAGE>   13

to participate in such loan or guaranty in proportion to the number of Units
held by each. The Annual Budgets for 1998 and 1999 will anticipate a requirement
of *** in third-party lease financing, which shall be guaranteed by the Members
to the extent required by the lender. Any additional loans or guarantees by
Members shall be approved in writing by the Members.

        3.5 Interest. Except for interest paid to Members for loans approved in
accordance with Section 3.4 above, no Member shall be entitled to any interest
with respect to such Member's contributions to or share of the capital of the
Company or its share of unallocated Net Income.

        3.6 Failure To Make Capital Contribution. In the event a Member fails to
make a Capital Contribution when due hereunder to satisfy a Capital Commitment,
the other Member (the "Aggrieved Member") may give the noncontributing Member
notice of such failure. If such failure continues for thirty (30) days after
such notice has been given, the Aggrieved Member may elect to take any of the
alternative actions described herein if it has made all of the Capital
Contributions theretofore due from it to the Company. Such an election shall
remain available to the Aggrieved Member until such time as the noncontributing
Member's Capital Commitment has been, or deemed to be, fully satisfied.

               (a) The Aggrieved Member may initiate the procedures described in
Article XII; or

               (b) The Aggrieved Member may contribute to the Company the cash
or property then due to the Company from the noncontributing Member, and the
amount of such cash (or the value of such property) shall be deemed to be a loan
from the Aggrieved Member to the noncontributing Member (a "Default Loan") and a
Capital Contribution by the noncontributing Member to the Company, in which
event the noncontributing Member's unsatisfied Capital Commitment shall be
deemed satisfied and the Company shall issue in the name of the noncontributing
Member that number of Units issuable on account of such a Capital Contribution
and deliver such Units (the "Pledged Units") to the Aggrieved Member to hold as
collateral for payment of the Default Loan. To secure payment of a Default Loan
and all accrued interest thereon for which it may hereafter become liable, each
Member hereby pledges to the other Member and grants to the other Member a
security interest in any Pledged Units. Any Default Loan shall bear interest at
the lesser of the maximum rate permitted by applicable law (if there is such a
maximum) or the prime rate of interest from time to time quoted by Bank of
America plus six percent (6%) and shall be due and payable in full (including
all accrued interest) within ninety (90) days after the Aggrieved Member
contributes the cash or property then due to the Company from the
noncontributing Member. If not



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                                      -8-
<PAGE>   14

sooner repaid, a Default Loan shall be repaid from any cash distributions
otherwise to be made by the Company to the noncontributing Member under this
Agreement and any payment otherwise to be made by the Company to the
noncontributing Member or Affiliate under any other contract binding on the
Company. Upon repayment of the Default Loan in full (other than disposal of the
Pledged Units), the Aggrieved Member shall deliver the Pledged Units to the
noncontributing Member and release its security interest therein. If a Default
Loan is not repaid in full when due and payable, the Aggrieved Member may, at
its sole election, dispose of the Pledged Units in accordance with the
California Uniform Commercial Code, as amended from time to time, as payment in
full of the Default Loan. Any unpaid Default Loan (including all accrued
interest) may also be offset against any amount to be paid to the
noncontributing Member by the Aggrieved Member in purchase of the
noncontributing Member's Units pursuant to Article XII.

                                   ARTICLE IV
                                ACTION BY MEMBERS

        4.1 Meetings of Members. Meetings of Members may be held for any purpose
at the request of any Member. Members may participate in a meeting of the
Members by means of conference telephone or similar communications equipment by
means of which all persons participating in the meeting can hear each other, and
such participation in a meeting shall constitute presence in person at the
meeting.

        4.2 Voting Standard. At any duly noticed meeting at which a quorum is
present, the vote of the Member(s) holding a Supermajority of the Units
represented at the meeting shall decide any question brought before the meeting,
except to the extent that the express provisions of law or this Agreement
require a different vote.

                                    ARTICLE V
                       MANAGEMENT; RESTRICTIONS; EXPENSES

        5.1 Management by Board of Managers. Except for situations in which the
approval of the Members is required by statute or this Agreement, in accordance
with Section 17151 of the Act, the Company shall be managed and controlled by
the Managers acting as a "Board of Managers." The Board of Managers may exercise
all powers of the Company and do all such lawful acts and things that are not by
statute, the Articles or this Agreement, directed or required to be exercised or
done by the Members themselves. It is intended that the powers and authority of
the Board of Managers shall be substantially the same as the powers and
authority of a board of directors of a corporation formed under the laws of the
State of California. Notwithstanding the foregoing, the Board of Managers may
not do or permit to be done any of the following without the approval of the
Members:



                                      -9-
<PAGE>   15

               (a) Any act or thing that the Act or this Agreement requires to
be approved, consented to or authorized by the Members;

               (b) Voluntarily cause the dissolution of the Company;

               (c) Compromise the liability of any Member for improper
distributions; or

               (d) Sell all or a substantial part of the Company's assets, other
than in the ordinary course of business.

        5.2 Number; Vacancies. The Board of Managers shall be comprised of six
(6) Managers, three of whom shall be appointed by ChiroSub (the "Chiro
Managers") and three of whom may be appointed by CombiSub (the "Combi
Managers"). A Chiro Manager may be removed from office by ChiroSub, and a Combi
Manager may be removed from office by CombiSub, at any time for any reason. In
the event that any Manager dies, resigns or is removed as a Manager, a
substitute manager may be appointed by the Member that appointed the former
Manager whose vacancy is being filled. On the Effective Date, the Chiro Managers
shall be Christine Soden, Alan Shaw and Ray McCague and the Combi Managers shall
be Peter Myers, Karin Eastham and Lee McCracken.

        5.3 Meetings of Managers. The Board of Managers may hold meetings, both
regular and special, either within or without the State of California. Regular
meetings of the Board of Managers shall be held at least once a month and may be
held at times and places determined by the Board of Managers. Special meetings
of the Board of Managers may be called by any Manager on 48 hours notice to each
Manager by any reasonable means, including but not limited to telephone or
facsimile transmission. Subject to Sections 5.7 and 5.8, at all meetings of the
Board of Managers, a majority of the Managers consisting of at least two Chiro
Managers and at least two Combi Managers shall constitute a quorum for the
transaction of business. If a quorum is not present at a meeting of the Board of
Managers, the Managers present may adjourn the meeting from time to time,
without notice other than announcement at the meeting, until a quorum shall be
present. Managers may participate in a meeting of the Board of Managers by means
of conference telephone or similar communications equipment by means of which
all persons participating in the meeting can hear each other, and such
participation in a meeting shall constitute presence in person at the meeting,
except that, for at least one meeting held each calendar quarter (which shall be
designated by the Chair as such in advance of the meeting), the Managers must
attend in person in order to participate. Meetings will alternate between the
offices of the Members or shall be held in New York, New York unless otherwise
agreed. The Member hosting any meeting shall appoint a secretary to the meeting
to record the minutes of the meeting, which will be circulated to the Managers
promptly following the meeting for review and comment and then kept in a minute
book for the Company available to all Managers and Members.



                                      -10-
<PAGE>   16

        5.4 Voting Procedures. Subject to Sections 5.7 and 5.8, the Chiro
Managers shall have, in the aggregate, one (1) vote and the Combi Managers shall
have, in the aggregate, one (1) vote, on each matter coming before the Board of
Managers at a meeting. Each such vote shall be cast by a majority of the Chiro
Managers or the Combi Managers, as the case may be, in attendance at the
meeting. Subject to Sections 5.7 and 5.8, any proposed action of the Board of
Managers shall require approval by both votes cast at a duly called meeting of
the Board of Managers at which a quorum is present to be effective.



                                      -11-
<PAGE>   17

        5.5 Action Without Meeting. Subject to Sections 5.7 and 5.8, any action
required or permitted to be taken at any meeting of the Board of Managers may be
taken without a meeting if all Managers consent thereto in writing, by single or
counterpart writings, and the writing or writings are filed with the minutes of
proceedings of the Board of Managers.

        5.6 Normal Functions of Board of Managers. Without limiting the
generality of Section 5.1, and subject to the other provisions of this
Agreement, the Board of Managers shall perform the functions described herein.

               (a) Prior to the end of each Fiscal Year, the Board of Managers
shall consider and approve an "Annual Budget" for next Fiscal Year consisting of
at least                               ***
                                       ***
                                       ***
                                       ***                       ; provided, 
however that the Annual Budgets for the Fiscal Years ending December 31, 1998
and December 31, 1999 shall be adopted at the first meeting of the Board of
Managers. The Capital Commitment of each Member in an Annual Budget shall be
equal, in aggregate amount and in dates and amounts of required Capital
Contributions, to that of every other Member.

               (b) The Board of Managers shall oversee the business activities
of the Company and at all times endeavor to operate the Company in a manner
consistent with the Annual Budget. Any Company expenditure(s) in any year that
will be more than (i) *** in excess of the line item budget for that expenditure
in the Annual Budget or (ii) *** of the aggregate expense budget in the Annual
Budget shall require prior approval of the Board of Managers before it may be
made.

               (c) The Board of Managers shall oversee, generally or
specifically, the design, production and marketing of chemical libraries of
Chiral Compounds to third parties and shall, from time to time, select those
Chiral Compounds to be individually synthesized and marketed.

               (d) The Board of Managers shall determine the best interest of
the Company in all dealings and proposed dealing with third parties and shall
approve, generally or specifically, the terms of any contract, agreement, deed,
lease, promissory note, or other instrument or document to be executed and
delivered by the Company.



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                                      -12-
<PAGE>   18

               (e) The Board of Managers shall take such steps as are reasonably
necessary and prudent to protect the proprietary rights of the Company in the
data, trade secrets, technical information, know-how, inventions, discoveries
and other proprietary or confidential information of the Company. Such steps may
include (i) filing for patents, trademarks and copyrights when and as
appropriate and (ii) opposing patent, copyright and trademark applications filed
by third parties which may have an adverse impact upon the Company's proprietary
rights. Any such patents, trademarks or copyrights which are issued during the
term of the Company shall be in the name of the Company and shall be the
property of the Company.

        5.7 Conflict of Interest Matters. If a Member or an Affiliate of a
Member is or will be a party to a contract or an arbitration proceeding under
Section 16.2 in which the Company also is, or is proposed to be, a party, those
Managers designated by that Member shall not participate in the consideration of
or vote upon any proposed action by the Company concerning said contract or
arbitration proceeding. Notwithstanding Sections 5.3, 5.4 and 5.5, in such an
event the quorum for a meeting of the Board of Managers to consider such a
proposal shall be any three (3), and the proposal shall be considered approved
by the Board of Managers upon the single vote approving the proposal cast by the
participating Managers at such a meeting or upon a written consent to the
proposal signed by all Managers who were eligible to participate in
consideration of the proposal. Without limiting the generality of the foregoing,

               (a) the Chiro Managers shall not consider or vote upon any
proposal by which the Company would rescind, waive, modify, enforce or exercise
any remedy under or with respect to the CT License, the ChiroTech, Inc. Services
Agreement, the CT Limited Services Agreement or those portions of the
Cooperation Agreement by which ChiroSub or CT Limited are bound;

               (b) the Chiro Managers shall not consider or vote upon any
proposal for the Company to initiate or respond to any arbitration proceeding
against ChiroSub pursuant to Section 16.2 or concerning the conduct of the
Company in such a proceeding;

               (c) the Combi Managers shall not consider or vote upon any
proposal by which the Company would rescind, waive, modify, enforce or exercise
any remedy under or with respect to the CombiChem License, the CombiChem
Services Agreement, or those portions of the Cooperation Agreement by which
CombiSub or CombiChem are bound; and

               (d) the Combi Managers shall not consider or vote upon any
proposal for the Company to initiate or respond to any arbitration proceeding
against CombiSub pursuant to Section 16.2 or concerning the conduct of the
Company in such a proceeding.

        5.8 Loss of Vote. In the event one Member acquires additional Units
pursuant to Section 3.6(b) on account of the failure of another Member to make
Capital 



                                      -13-
<PAGE>   19

Contributions sufficient to satisfy its Capital Commitments and, as a result,
said Member owns not less than a Supermajority of all then-issued and
outstanding Units, the voting right of the Managers designated by the
noncontributing Member shall be suspended until such time (if ever) as said
Member owns less than a Supermajority of all then-issued and outstanding Units.
Notwithstanding Section 5.3, 5.4 and 5.5, during any such suspension the quorum
for a meeting of the Board of Managers shall be any three (3), and the Board of
Managers will act upon the single vote then eligible to be cast or upon a
written consent signed by all Managers who were eligible to participate in the
casting of that vote.

        5.9 Manager Compensation and Expenses. The Board of Managers shall
receive no compensation from the Company for their services as Managers, but
each Manager shall be reimbursed for his or her reasonable out-of-pocket
expenses incurred in attending meetings of the Board of Managers and performing
related duties of the office under reasonable reimbursement procedures.

                                   ARTICLE VI
                                     NOTICES

        6.1 Notices. Whenever notice or demand is required to be given to any
Member by the Act, the Articles or this Agreement, it shall be given in writing,
by mail, addressed to such Member at such Member's address as it appears on the
records of the Company with postage thereon prepaid, and shall be deemed given
three days after it is deposited in the United States mail. Notice to Members
may also be given by facsimile and shall be deemed given upon the sending
thereof with electronic confirmation of receipt.

        6.2 Waiver of Notice. A Member may waive notice, provided that the
waiver is in writing signed by the Member whether before or after the notice is
required to be given.



                                      -14-
<PAGE>   20

                                   ARTICLE VII
                                    OFFICERS

        7.1 Chair. The initial Chair of the Board of Managers shall be Alan
Shaw, and he shall serve in such capacity until the end of Fiscal Year 1999.
Then CombiSub shall designate one Manager from among the CombiSub Managers to
serve as Chair of the Board of Managers for a term of one (1) year concurrent
with the next Fiscal Year. Thereafter the Chair shall be a Chiro Manager
designated by ChiroSub, then a Combi Manager designated by CombiSub, and so
forth for successive one year terms. In the event a Chair ceases to be a Manager
during his or her term of office as the Chair, the Member which appointed the
former Chair shall designate another Manager to serve as the Chair for the
balance of the former Chair's term. The Chair shall preside at all meetings of
the Board of Managers.

        7.2 Other Officers. The Board of Managers may create such other offices
and elect such other officers as it deems appropriate. Any number of offices may
be held by the same person. The duties of such officers shall be established
from time to time by the Board of Managers.

        7.3 Contracts. After the Effective Date, the Board of Managers shall
expressly designate one or more Managers or officers to execute and deliver, on
behalf of the Company, any contract, agreement, deed, lease or other document or
instrument approved generally or specifically by it, and any such document or
instrument executed and delivered by such an authorized Person or Persons shall
be deemed to have been duly executed and delivered by the Company. No Member's
signature shall be required in connection with execution and delivery on such
documents and instruments by the Company, and third parties to such documents
and instruments shall be entitled to rely upon the Board of Manager's general or
specific approval and delegation of authority to the signatory or signatories on
behalf of the Company without otherwise ascertaining whether the requirements of
this Agreement have been satisfied.



                                      -15-
<PAGE>   21

                                  ARTICLE VIII
                             ACCOUNTING AND RECORDS

        8.1 Financial Statements and Records. The Company shall prepare its
financial statements and tax returns using such methods of accounting as the
Board of Managers deems necessary or appropriate. The Company shall maintain
proper and complete books of account and records of the business of the Company,
under the supervision of the Board of Managers, at the Company's principal
office or at such other place or places as may be designated by the Board of
Managers. The Board of Managers shall give notice to each Member of any change
in the location of the books and records. The Company has initially contracted
with CombiChem for preparation of such statements, books and records pursuant to
the CombiChem Services Agreement.

        8.2 Inspection of Books. The Company's books and records shall be open
to inspection, audit and copying by any Member, or such Member's designated
representative, upon reasonable notice at any time during business hours for any
purpose reasonably related to the Member's interest in the Company. Any
information so obtained shall be kept confidential by the Member except as
required by law.

        8.3 Annual and Monthly Reports. Financial statements of the Company
shall be prepared as of the end of each Fiscal Year and audited by a firm of
independent certified public accountants selected by the Board of Managers,
provided, however, that the Board of Managers may waive the audit requirement at
any time and for any reason. A copy of the annual financial statements shall be
transmitted to the Members within 45 days after the end of each Fiscal Year. In
addition, the Company shall cause unaudited monthly financial statements,
including a comparison of actual results to the projections found in the Annual
Budget applicable for the reporting period, to be prepared and distributed to
the Members within 30 days after the end of each month beginning with December
1998.

        8.4 Tax Returns. Within 90 days after the end of each Fiscal Year, the
Board of Managers shall file a federal income tax information return and
transmit to each Member a schedule showing such Member's distributive share of
the Company's income, deductions and credits, and all other information
necessary for such Member to timely file its own federal income tax return for
the Fiscal Year. The Board of Managers similarly shall file, and provide
information to the Members regarding, all appropriate state and local income tax
returns.

                                   ARTICLE IX
                                   ALLOCATIONS



                                      -16-
<PAGE>   22

        9.1 Allocation of Net Income or Net Loss. For each Accounting Period ,
Net Income or Net Loss of the Company, or items thereof, shall be allocated to
the Members in proportion to the number of Units held by each.

        9.2 Partnership Status. The Members agree that the Company shall be
treated as a partnership for all U.S. federal income tax purposes.

                                    ARTICLE X
                                  DISTRIBUTIONS

        10.1 Allocation of Distributions among Holders of Units. All
distributions by the Company to holders of Units shall be made in proportion to
the holders' ownership of such Units at the time of the distribution.

        10.2 Discretionary Distributions. The Board of Managers may cause the
Company to make distributions to the holders of Units in accordance with Section
10.1 in such amounts and at such times as they shall from time to time determine
to be in the best interests of the Company and its Members; provided, however,
that distribution of an amount equal to any estimated distribution amount set
forth in the Annual Budget for a Fiscal Year shall be presumptively valid if the
Company realized excess cash flow in at least that amount from operations during
that Fiscal Year. If any assets are distributed in kind, then they shall be
distributed on the basis of the fair market value thereof as determined by the
Members, and shall be deemed to have been sold at such fair market value for
purposes of the allocations under Article IX.

        10.3 No Other Withdrawals. Except as otherwise expressly provided for in
this Agreement, no withdrawals or distributions shall be required or permitted.



                                      -17-
<PAGE>   23

                                   ARTICLE XI
                                    TRANSFERS

        11.1 Transfer of Units. A Member may Transfer one or more Units to
another Member. A Member may also Transfer one or more Units to a Substitute
Member, in whole or in part, and the Substitute Member will be admitted to the
Company as a member, only if: (i) the Substitute Member shall have agreed in
writing to assume all of the obligations of the Member with respect to the Units
being so Transferred (including the obligations imposed hereunder as a condition
to any transfer); (ii) the Board of Managers shall have concluded (which
conclusion may be based upon an opinion of counsel satisfactory to it) that the
Transfer will not result in a termination of the Company for federal or state
income tax purposes, result in (or materially increase the risk of) the Company
being taxable as a corporation for federal income tax purposes, or result in a
violation of any law, rule or regulation by the Member, the Substitute Member,
the Company or the other Member(s); and (iii) all other Member(s) shall have
consented to the Transfer, such consent not to be unreasonably withheld.

        11.2 Transfer Void. Any purported Transfer of Units in contravention of
this Article XI shall be void and of no effect to, on or against the Company,
any Member, any creditor of the Company or any claimant against the Company.

        11.3 Transfer of Control of Member. Any Transfer of legal or beneficial
ownership or control of a Member, whether by sale or issuance of the Member's
equity securities, voting trust agreement, irrevocable proxy or otherwise, shall
be deemed an attempted Transfer of the Units owned by that Member for purposes
of this Article XI in contravention of Section 11.1.

        11.4 Transfer of Control of Affiliates.

               (a) If there is any Transfer of legal or beneficial ownership or
control of *** , whether by sale or issuance of equity securities, voting trust
agreement, irrevocable proxy or otherwise, and *** continues to be an
    *** after such Transfer, *** may, in its sole discretion, institute the
buy-sell provisions described in Article XII.

               (b) If there is any Transfer of legal or beneficial ownership or
control of *** , whether by sale or issuance of equity securities, voting trust
agreement, irrevocable proxy or otherwise, and *** continues to be an



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                                      -18-
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*** after such Transfer, *** may, in its sole discretion, institute the buy-sell
provisions described in Article XII.

               (c) As used herein, a *** is a Person for whom at least *** of
its consolidated revenues during its most recently completed fiscal year were
earned from the sale of goods or services that *** (i) in the case of *** , with
those *** by any *** that accounted for at least *** of the consolidated
revenues of *** during the same period, and (ii) in the case of *** , with those
*** by any *** that accounted for at least *** of the consolidated revenues of
*** during the same period.

        11.5 Acquisition of        ***      .

               (a) If *** or its Affiliates acquire legal or beneficial
ownership or control of a *** , whether by purchase of equity securities, a
voting trust agreement, irrevocable proxy or otherwise, *** may, in its sole
discretion, institute the buy-sell provisions described in Article XII.

               (b) If *** or its Affiliates acquire legal or beneficial
ownership or control of a *** , whether by purchase of equity securities, a
voting trust agreement, irrevocable proxy or otherwise, *** may, in its sole
discretion, institute the buy-sell provisions described in Article XII.

                                   ARTICLE XII
                               BUY-SELL PROVISION

        12.1 Application. The procedures described in this Article XII are
available only so long as there are only two Members admitted to the Company.
Either Member may initiate the procedures, by giving the other Member notice
pursuant to Section 12.2(a), during the ninety (90) days following (i)
dissolution of the Company pursuant to Section 14.1 or (ii) declaration of a
Board Deadlock pursuant to Section 16.1. In addition, an Aggrieved Member under
Section 3.6(a) may initiate the procedures, by giving the other Member notice
pursuant to Section 12.2(a), as provided therein.

        12.2 Procedures

               (a) The Member initiating these procedures shall give the other
Member a notice (the "Price Notice") of its election to do so, together with a
statement of a 



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                                      -19-
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hypothetical sale price for all the Company's assets, free and clear of the
Company's secured and unsecured liabilities, and a calculation of the net
proceeds per Unit (the "Per Unit Price") that each Member would receive if the
Company sells all of its assets for cash in the amount of the hypothetical sale
price, satisfies all of its liabilities, and distributes the net proceeds to the
Members in accordance with this Agreement on the date the Price Notice is given.

               (b) The other Member shall have thirty (30) days after the Price
Notice is given in which to elect to purchase the Units of the initiating
Member, or to sell its Units to the initiating Member, for a price per Unit
equal to the Per Unit Price. Such an election shall be made by notice given to
the initiating Member, in the absence of which the other Member shall be deemed
to have elected to sell its Units to the initiating Member. The price shall be
payable in cash at closing, which will occur on the tenth (10th) business day
after the other Member has elected (or is deemed to have elected) to sell its
Units to the initiating Member or purchase the Units of the initiating Member.
At the closing, each Member shall execute and deliver such documents and take
such other actions as may be necessary or customary to lawfully effect the sale
and transfer of Units from one Member or the other.

                                  ARTICLE XIII
                   INDEMNIFICATION AND LIMITATION OF LIABILITY

        13.1 Indemnification.

               (a)To the extent permitted by the Act and by law, the Managers,
the Members as such, and the directors, officers, employees and agents of any of
the foregoing (herein collectively referred to as "Indemnitees") shall, in
accordance with this Section, be indemnified and held harmless by the Company
from and against any and all loss, claims, damages, liabilities joint and
several, expenses, judgments, fines, settlements and other amounts arising from
any and all claims (including reasonable legal expenses and reasonable
attorneys' fees), demands, actions, suits or proceedings (civil, criminal,
administrative or investigative) in which the Indemnitee may be involved, as a
party or otherwise, by reason of management of, or involvement in, the affairs
of the Company, or rendering of advice or consultation with respect thereto, or
which relate to the Company, its properties, business or affairs, if (i) such
Indemnitee acted in good faith and in a manner such Indemnitee reasonably
believed to be in, or not opposed to, the best interests of the Company, and
(ii) with respect to any criminal proceeding, such Indemnitee had no reasonable
cause to believe the conduct of such Indemnitee was unlawful. The termination of
a proceeding by judgment, order, settlement, conviction or upon a plea of nolo
contendere, or its equivalent, shall not, of itself, create a presumption that
the Indemnitee did not act in good faith and in a manner which the Indemnitee
reasonably believed to be in, or not opposed to, the best interests of the
Company or that the Indemnitee had reasonable cause to believe that the
Indemnitee's conduct was unlawful (unless there has been a final adjudication in
the proceeding that the Indemnitee 



                                      -20-
<PAGE>   26

did not act in good faith and in a manner which the Indemnitee reasonably
believed to be in or not opposed to the best interests of the Company; or that
the Indemnitee did have reasonable cause to believe that the Indemnitee's
conduct was unlawful).

               (b) The Company may also indemnify any Person who was or is a
party or is threatened to be made a party to any threatened, pending, or
completed action by or in the right of the Company to procure a judgment in its
favor by reason of the fact that such Person is or was an officer, employee or
agent of the Company, against expenses reasonably incurred by such Person in
connection with the defense or settlement of such action, if such Person acted
in good faith and in a manner such Person reasonably believed to be in, or not
opposed to, the best interests of the Company, except that indemnification shall
be made in respect of any claim, issue or matter as to which such Person shall
have been adjudged to be liable for misconduct in the performance of the
Person's duty to the Company only to the extent that the court in which such
action or suit was brought, or another court of appropriate jurisdiction,
determines upon application that, despite the adjudication of liability, but in
view of all circumstances of the case, such Person is fairly and reasonably
entitled to indemnity for such expenses which such court shall deem proper. To
the extent that the Person has been successful on the merits or otherwise in
defense of any proceedings referred to herein, or in defense of any claim, issue
or matter therein, the Person shall be indemnified by the Company against
expenses actually and reasonably incurred by the Person in connection therewith.
Notwithstanding the foregoing, no Person shall be entitled to indemnification
hereunder for any conduct arising from the gross negligence or willful
misconduct or reckless disregard in the performance of the Person's duties under
this Agreement.

               (c) Expenses (including attorneys' fees) incurred in defending
any proceeding under Sections 13.1 (a) or (b) shall be paid by the Company in
advance of the final disposition of such proceeding upon receipt of an
undertaking by or on behalf of the Indemnitee or Person to repay such amount if
it shall ultimately be determined that the Indemnitee or Person is not entitled
to be indemnified by the Company as authorized hereunder.

               (d) The indemnification provided by this Section 13.1 shall not
be deemed to be exclusive of any other rights to which any Person may be
entitled under any agreement, or as a matter of law, or otherwise, both as to
action in a Person's official capacity and to action in another capacity.

               (e) The Board of Managers shall have power to purchase and
maintain insurance on behalf of the Company, the Managers, Members, officers,
employees or agents of the Company and any other Indemnitees at the expense of
the Company, against any liability asserted against or incurred by them in any
such capacity whether or not the Company would have the power to indemnify such
Persons against such liability under the provisions of this Agreement.



                                      -21-
<PAGE>   27

        13.2 Limitation of Liability. Notwithstanding anything to the contrary
herein contained, the debts, obligations and liabilities of the Company shall be
solely the debts, obligations and liabilities of the Company; and no Manager or
Member shall be obligated personally for any such debt, obligation or liability
of the Company solely by reason of being a Manager or Member of the Company.

                                   ARTICLE XIV
                                   TERMINATION

        14.1 Termination. The Company shall be dissolved, its assets disposed
of, and its affairs wound up upon the first to occur of the following:

               (a) the expiration of its stated term;

               (b) the affirmative vote of Member(s) holding not less than a
Supermajority of the Units;

               (c) the entry of a decree of judicial dissolution under the Act;
or

               (d) 90 days following the occurrence of a Dissolution Event.

        14.2 Continuance of the Company. Notwithstanding Section 14.1(d), upon
the occurrence of a Dissolution Event, if there are at least two remaining
Members, all remaining Members may avoid dissolution of the Company by electing,
within 90 days after a Dissolution Event, to continue the business of the
Company on the same terms as this Agreement. Expenses incurred in the
continuance of the Company shall be deemed expenses of the Company



                                      -22-
<PAGE>   28

        14.3 Authority to Wind Up. The Board of Managers shall have all
necessary power and authority required to marshal the assets of the Company, to
pay its creditors and liabilities, to distribute assets and otherwise wind up
the business and affairs of the Company. The Board of Managers shall continue to
conduct the business and affairs of the Company for such period as may be
necessary to allow an exercise of purchase rights under Article XII ( and
consummation of any purchase and sale resulting from the exercise of such
rights) and shall thereafter continue to conduct the business and affairs of the
Company only insofar as such continued operation remains consistent, in the
judgment of the Board of Managers, with an orderly winding up of the Company.

        14.4 Winding Up and Certificate of Cancellation.The winding up of the
Company shall be completed when all debts, liabilities and obligations of the
Company have been paid and discharged or reasonably adequate provision therefor
has been made, and all of the remaining property and assets of the Company have
been distributed to the Members. Upon the completion of winding up of the
Company, a Certificate of Cancellation shall be filed with the Office of the
Secretary of State of California.

        14.5 Distribution of Assets. Upon dissolution and winding up of the
Company, the affairs of the Company shall be wound up and the Company liquidated
by the Board of Managers. Pursuant to such liquidation, the assets of the
Company in the form of intellectual property owned by the Company (other than
rights under the CT License and the Combi License which shall terminate upon the
winding up of the Company except as provided in Section 6.2 of each such license
agreements) shall be distributed in kind, and the other assets of the Company
shall be sold unless the Members shall consent to a distribution in kind of such
other assets. If the Members do not consent to a distribution in kind but the
Board of Managers determines that an immediate sale would be financially
inadvisable, they may defer sale of the Company assets for a reasonable time. If
any assets are distributed in kind, then they shall be distributed on the basis
of the fair market value thereof as determined by appraisal, and shall be deemed
to have been sold at such fair market value for purposes of the allocations
under Article IX. Unless the Members otherwise agree, if any assets are to be
distributed in kind, they shall be distributed to the Members, as
tenants-in-common, in undivided interests in proportion to distributions to
which the Members are entitled under this Section 14.5. The assets of the
Company, whether cash or in kind, shall be distributed as follows in accordance
with the Act:

               (a) to creditors of the Company in the order of priority provided
by law; and

               (b) the Members in proportion to the number of Units held by
each.



                                      -23-
<PAGE>   29

        14.6 Effect of Termination. The Company shall terminate and cease to
exist when all of its assets have been sold and/or distributed and all of its
affairs have been wound up.

                                   ARTICLE XV
                                   DEFINITIONS

        15.1 Definitions. The following terms shall have the meanings set forth
herein for purposes of this Agreement:

               (a) "Accounting Period" shall mean, for each Fiscal Year, the
period beginning January 1 and ending December 31, provided however, that the
first Accounting Period shall commence on the date of formation of the Company,
the last Accounting Period shall end on the date of the final winding up of the
affairs of the Company, and a new Accounting Period shall commence on any date
on which the Company terminates for tax purposes.

               (b) "Act" shall have the meaning set forth in Section 1.1.

               (c) "Affiliate" shall mean, with respect to a specified Person,
(other than a natural person), a Person that directly, or indirectly through one
or more intermediaries, controls or is controlled by, or is under common control
with, the specified Person.

               (d) "Agreement" shall mean this Limited Liability Company
Operating Agreement as the same may be amended from time to time.

               (e) "Annual Budget" shall mean the budget of income and expenses
for the Company for each Fiscal Year, and related financial information,
approved by the Board of Managers pursuant to Section 5.6 (a).

               (f) "Articles" shall have the meaning set forth in Section 1.1.

               (g) "Bankruptcy" shall mean, with respect to any Person, that a
petition shall have been filed by or against such Person as a "debtor" and the
adjudication of such Person as a bankrupt under the provisions of the bankruptcy
laws of the United States of America shall have commenced, or that such Person
shall have made an assignment for the benefit of its creditors generally or a
receiver shall have been appointed for substantially all of the property and
assets of such Person.

               (h) "Board of Managers" shall have the meaning set forth in
Section 5.1.

               (i) "Capital Commitment" shall mean, for each Member, the amount
of money and/or property required to be contributed by that Member to the
capital of the Company pursuant to Article III.



                                      -24-
<PAGE>   30

               (j) "Capital Contribution" shall mean, for each Member, that
amount of money and/or property actually contributed by that Member to the
capital of the Company pursuant to Article III .

               (k) "Carrying Value" means, with respect to any asset, the
asset's adjusted basis for federal income tax purposes, except as follows:

                      (1) The initial Carrying Value of any asset contributed by
a Member to the Company shall be the agreed-upon fair market value of the asset
upon contribution, as determined by the contributing Member and the Company. The
initial Carrying Value of any asset contributed to the Company as a Capital
Contribution shall be set forth in the Annual Budget calling for that Capital
Contribution.

                      (2) In the discretion of the Board of Managers, the
Carrying Values of all assets may be adjusted to equal their respective fair
market values, as determined by the Board of Managers, and the resulting
unrecognized gain or loss allocated to each Member as though such assets had
been sold for their respective fair market values as of the following times: (A)
the acquisition of any additional Units in the Company by any new or existing
Member in exchange for more than a de minimis Capital Contribution; and (B) the
distribution by the Company to a Member of more than a de minimis amount of
assets, unless all Members receive simultaneous distributions of either
undivided interests in the distributed property or identical assets in
proportion to their ownership of Units in the Company.

                      (3) The Carrying Values of all assets shall be adjusted to
equal their respective fair market values, as determined by the Board of
Managers, and the resulting unrecognized gain or loss allocated to each Member
as though such assets had been sold for their respective fair market values as
of the following times: (A) the date the Company is liquidated within the
meaning of Treasury Regulation Section 1.704-1 (b)(2)(ii)(g); and (B) the
termination of the Company pursuant to the provisions of this Agreement.

                      (4) The Carrying Values of assets shall be increased or
decreased to the extent required under Treasury Regulation Section
1.704-1(b)(2)(iv)(m) in the event that the adjusted tax basis of assets is
adjusted pursuant to Code Sections 732, 734 or 743.

                      (5) The Carrying Value of an asset that is distributed
(whether in liquidation of the Company or otherwise) to one or more Members
shall be adjusted to equal its fair market value, as determined by the Board of
Managers, and the resulting unrecognized gain or loss allocated to each Member
as though such asset had been sold for such fair market value.



                                      -25-
<PAGE>   31

                      (6) The Carrying Value of an asset shall be adjusted by
the depreciation, amortization or other cost recovery deductions, if any, taken
into account by the Company with respect to such asset in computing Net Profit
or Net Loss.

               (l) "Chiral Compound" shall mean a chemical compound manufactured
by or on behalf of the Company pursuant to rights granted in the License
Agreements.

               (m) "Chiro Ancillary Agreements" shall mean the Cooperation
Agreement, the CT License, the Chirotech Services Agreement and the CT Limited
Services Agreement.

               (n) "ChiroSub" shall mean Chirotech Limited, a company organized
and existing under the laws of England and Wales.

               (o) "Chirotech, Inc." shall mean Chirotech, Inc., a Delaware
corporation.

               (p) "Chirotech Services Agreement" shall mean that certain
Services Agreement of even date herewith between Chirotech, Inc. and the
Company.

               (q) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

               (r) "Combi Ancillary Agreements" shall mean the Cooperation
Agreement, the CombiChem License and the CombiChem Services Agreement.

               (s) "CombiChem" shall mean CombiChem, Inc., a Delaware
corporation.

               (t) "CombiChem License" shall mean that certain License Agreement
of even date herewith between CombiChem and the Company.

               (u) "CombiChem Services Agreement" shall mean that certain
Services Agreement of even date herewith between CombiChem and the Company.

               (v) "CombiSub" shall mean CombiChem JVR, Inc., a Delaware
corporation.

               (w) "Cooperation Agreement" shall mean that certain Cooperation
Agreement of even date herewith between CT Limited, Chirosub, CombiChem,
CombiSub and the Company.

               (x) "CT License" shall mean that certain License Agreement of
even date herewith between CT Limited and the Company.

               (y) "CT Limited" shall mean Chirotech Technology Limited, a
company organized and existing under the laws of England and Wales.



                                      -26-
<PAGE>   32

               (z) "CT Limited Services Agreement" shall mean that certain
Services Agreement of even date herewith between CT Limited and the Company.

               (aa) "Dissociated Member" shall have the meaning set forth in
Section 2.6.

               (bb) "Dissolution" of a Member that is not a natural person shall
mean that such Member has terminated its existence, whether partnership,
corporate or limited liability company, wound up its affairs and dissolved;
provided, however, that a change in the membership of any Member that is a
general partnership shall not constitute "Dissolution" hereunder, whether or not
the Member is deemed technically dissolved for partnership law purposes, so long
as the business of the Member is continued.

               (cc) "Dissolution Event" shall mean the Bankruptcy or Dissolution
of a Member, the occurrence of which terminates the Member's continued
membership in the Company and results in the dissolution and winding up of the
Company under the Act unless the remaining Members (if more than one)
unanimously agree otherwise pursuant to Section 14.2.

               (dd) "Effective Date" shall mean the later of (i) the date on
which the Articles are filed in the office of the Secretary of State of
California, or (ii) the date on which this Agreement is executed and delivered
by the initial Members, the Chiro Ancillary Agreements are executed and
delivered by the parties thereto, and the Combi Ancillary Agreements are
executed and delivered by the parties thereto.

               (ee) "Fiscal Year" shall mean the period from January 1 to
December 31 of each year, or as otherwise required by law.

               (ff) "Initial Term" shall have the meaning set forth in Section
1.7.

               (gg) " *** " shall have the meaning set forth in Section 11.4.

               (hh) "Manager" shall mean a natural person appointed to the Board
of Managers under Article V and who has not resigned or been removed as a
manager pursuant to this Agreement.

               (ii) "Members" shall mean the initial Members of the Company and
all Substitute Members, but does not include Dissociated Members.

               (jj) "Net Income or Net Loss" shall mean the net book income or
loss of the Company for any relevant period. The net book income or loss of the
Company shall be computed in accordance with federal income tax principles (i)
under the method of 



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                                      -27-
<PAGE>   33

accounting elected by the Company for federal income tax purposes, (ii) as
applied without regard to any recharacterization of transactions or relationship
that might otherwise be required under such tax principles and (iii) as
otherwise adjusted by:

                      (1) including as income or deductions, as appropriate, any
tax-exempt income and related expenses that are neither properly included in the
computation of taxable income nor capitalized for federal income tax purposes;

                      (2) including as a deduction when paid or incurred
(depending on the Company's method of accounting) any amounts utilized to
organize the Company or to promote the sale of (or to sell) an interest in the
Company, except that amounts for which an election is properly made by the
Company under Section 709(b) of the Code shall be accounted for as provided
therein; and

                      (3) calculating the gain or loss on disposition of assets
and the depreciation, amortization or other cost-recovery deductions, if any,
with respect to assets by reference to their Carrying Values rather than their
adjusted tax basis.

               (kk) "Person" shall mean a natural person, partnership (whether
general or limited), limited liability company, trust, estate, association,
corporation, custodian, nominee, or any other individual or entity in its own or
representative capacity, whether domestic or foreign.

               (ll) "Substitute Member" shall mean only an Affiliate of an
initial Member.

               (mm) "Supermajority" shall mean, when referring to Units, greater
than seventy-five percent (75%) of all outstanding Units.

               (nn) "Transfer" shall mean any transfer, sale, exchange,
encumbrance, pledge, mortgage, assignment or other disposition, whether
voluntary or involuntary.

               (oo) "Treasury Regulation" shall mean any regulation issued by
the United States Department of the Treasury pursuant or relating to the Code.

                                   ARTICLE XVI
                               DISPUTE RESOLUTION

        16.1 Board of Managers Deadlock. In the event the Board of Managers
fails to approve an Annual Budget for a Fiscal Year pursuant to Section 5.6 (a)
before the commencement of that Fiscal Year, the Annual Budget for the preceding
Fiscal Year shall be deemed approved for the Fiscal Year until such time as the
Board of Managers approves a new one for that Fiscal Year. In the event of any
other deadlock in voting at a meeting of the Board of Managers regarding any
material decision relating to the Company, any Manager may declare the existence
of a deadlocked vote, in which event 



                                      -28-
<PAGE>   34

the proposal or other subject matter of the deadlocked vote shall be referred by
the Company to the chief executive officer of CombiChem and the chairman of CT
Limited, who shall confer in good faith in an effort to eliminate the deadlock
and otherwise consider the matter for a period of thirty (30) days following
referral. If the deadlock is not so broken by that date, either Member may
declare that a Board Deadlock exists, and exercise the rights provided in
Section 12.1, at any time during the next ninety (90) days.

        16.2 Arbitration. Except as hereinabove provided, any controversy
between the Members and any claim by one Member against the Company or another
Member arising out of or relating to this Agreement, or the breach thereof,
shall be settled by arbitration in San Francisco, California in accordance with
the then-applicable commercial arbitration rules of the American Arbitration
Association. Judgment upon the award rendered may be entered into any court
having jurisdiction thereof. The losing party shall bear the costs and expenses
of such arbitration.

                                  ARTICLE XVII
                                  MISCELLANEOUS

        17.1 Amendment. Except as provided herein, this Agreement may be amended
only with the written consent of a majority of the Board of Managers and of
Member(s) holding a Supermajority of Units.

        17.2 Withholding Taxes.

               (a)The Company shall at all times be entitled to make payments
with respect to any Member in amounts required to discharge any obligation of
the Company to withhold or make payments to any governmental authority with
respect to any federal, state, local or other jurisdictional tax liability of
such Member arising as a result of such Member's interest in the Company. To the
extent each such payment satisfies an obligation of the Company to withhold with
respect to any distribution to a Member on which the Company did not withhold or
with respect to any Member's allocable share of the income of the Company, each
such payment shall be deemed to be a loan by the Company to such Member (which
loan shall be deemed to be immediately due and payable) and shall not be deemed
a distribution to such Member. The amount of such payments made with respect to
such Member, plus interest on each such amount from the date of each such
payment until such amount is repaid to the Company accruing at an interest rate
per annum equal to the Bank of America prime rate from time to time in effect,
shall be repaid to the Company by (i) deduction from any cash distributions made
to such Member pursuant to this Agreement; (ii) deduction from any non-cash
distributions made to such Member, or (iii) earlier payment by such Member to
the Company, in each case as determined by the Board of Managers in its sole
discretion. The Board of Managers may, in its discretion, defer making
distributions to any Member owing amounts to the Company pursuant to this
Section until such amounts are paid to 



                                      -29-
<PAGE>   35

the Company and shall in addition exercise any other rights of a creditor with
respect to such amounts.

               (b) Each Member agrees to indemnify and hold harmless the
Company, the Managers and the Members, from and against any liability for taxes,
interest or penalties that may be asserted by reason of the failure to deduct
and withhold tax on amounts distributable or allocable to said Member. Any
amount payable as indemnity hereunder by a Member shall be paid promptly to the
Company upon request for such payment from the Board of Managers, and if not so
paid, the Board of Managers and the Company shall be entitled to claim against
and deduct all such amounts from the allocated portion of Net Profits of, or
from any distribution due to, the affected Member.

        17.3 Publicity. The Company will consult each of the Members and with
Chiroscience Group plc ("Chiroscience"), currently the holder of 70% of the
outstanding equity of CT Limited, prior to any public announcement relating to
the Company and transactions and/or activities contemplated by this Agreement,
the Chiro Ancillary Agreements or the Combi Ancillary Agreements and the terms
hereof and thereof; provided, however, that if the percentage of the equity
ownership of CT Limited held by Chiroscience becomes less than 50%, the Company
will no longer be required to consult with Chiroscience prior to any such public
announcement. The Members and Chiroscience, if applicable, will mutually and
reasonably approve the timing, content and dissemination of any public
announcement, except to the extent that any such party is not reasonably able to
consult in a timely manner with or obtain the approval of the other parties when
disclosures are required by applicable law; and, provided further, that either
party may disclose the transactions contemplated by this Agreement, the Chiro
Ancillary Agreements or the Combi Ancillary Agreements and the terms hereof and
thereof in connection with any bona fide corporate finance transaction
(including ongoing credit facilities), the merger or consolidation of a party or
any other transaction effecting a significant change in the ownership or control
of a Member or an Affiliate or all or substantially all of a Member's or an
Affiliate's business, assets or stock, or other similar corporate transaction or
purpose not related to pricing strategies or marketing plans.

        17.4 Further Assurances. The parties agree to execute and deliver any
further instruments or documents and perform any additional acts that are or may
become necessary to effectuate and carry on the Company created by this
Agreement.

        17.5 Construction. Every covenant, term and provision of this Agreement
shall be construed simply according to its fair meaning and not strictly for or
against any Member.

        17.6 Time. In computing any period of time pursuant to this Agreement,
the day of the act, event or default from which the designated period of time
begins to run shall not be included, but the time shall begin to run on the next
succeeding day. The last day 



                                      -30-
<PAGE>   36

of the period so computed shall be included, unless it is not a business day, in
which event the period shall run until the end of the next business day.

        17.7 Headings. Section and other headings contained in this Agreement
are for reference purposes only and are not intended to describe, interpret,
define, or limit the scope, extent, or intent of this Agreement or any provision
hereof.

        17.8 Severability. Except as otherwise provided in the succeeding
sentence, every provision of this Agreement is intended to be severable, and, if
any term or provision of this Agreement is illegal or invalid for any reason
whatsoever, such illegality or invalidity shall not affect the validity or
legality of the remainder of this Agreement. The preceding sentence of this
Section shall be of no force or effect if the consequence of enforcing the
remainder of this Agreement without such illegal or invalid term or provision
would be to cause Member to lose the material benefit of its economic bargain.



                                      -31-
<PAGE>   37

        17.9 Variation of Terms. All terms and any variations thereof shall be
deemed to refer to masculine, feminine, or neuter, singular or plural, as the
identity of the Person or Persons may require.

        17.10 Governing Law. The laws of the State of California shall govern
the validity of this Agreement, the construction of its terms, and the
interpretation of the rights and duties arising hereunder.

        17.11 Binding Effect. Subject to the restrictions on Transfer set forth
in Article XI, this Agreement shall be binding on and inures to the benefit of
the Members and their respective transferees, successors, assigns and legal
representatives.

        17.12 Entire Agreement. This Agreement constitutes the entire agreement
among the parties with respect to the subject matter herein.

        17.13 Counterparts.This Agreement may be executed in one or more
counterparts with the same force and effect as if each of the signatories had
executed the same instrument.



                                      -32-
<PAGE>   38

        IN WITNESS WHEREOF, all of the Members of ChiroChem Discovery Services
LLC, a California limited liability company, have executed this Limited
Liability Company Operating Agreement as of the day and year first above
written.

                                    MEMBERS:

                                    CHIROTECH LIMITED, a company organized and
                                    existing under the laws of England and Wales

                                    By:   /s/  Christine H. Soden
                                         ---------------------------------------
                                    Name:  Christine H. Soden
                                          --------------------------------------
                                    Title:   Director
                                          --------------------------------------

                                    Address:      Cambridge Science Park
                                                  Milton Road
                                                  Cambridge CB4 4WE
                                                  England


                                    COMBICHEM JVR, INC., a Delaware corporation

                                    By:  /s/  Vicente Anido, Jr.
                                         ---------------------------------------
                                    Name:   Vicente Anido, Jr.
                                          --------------------------------------
                                    Title:  President & CEO
                                          --------------------------------------

                                    Address:      9050 Camino Santa Fe
                                                  San Diego, CA  92121




                        [SIGNATURE PAGE TO LLC AGREEMENT]


<PAGE>   1
                                                                   EXHIBIT 10.65



                              COOPERATION AGREEMENT


        THIS COOPERATION AGREEMENT (this "Agreement") dated as of December 1,
1998, is by and among CHIROTECH TECHNOLOGY LIMITED (Registration No. 2667953), a
company organized and existing under the laws of England and Wales ("CT
Limited"); CHIROTECH LIMITED (Registration No. 3580272), a company organized and
existing under the laws of England and Wales and a wholly owned subsidiary of CT
Limited ("ChiroSub"); COMBICHEM, INC., a Delaware corporation ("CombiChem");
COMBICHEM JVR, INC., a Delaware corporation and wholly owned subsidiary of
CombiChem ("CombiSub"); AND CHIROCHEM DISCOVERY SERVICES LLC, a California
limited liability company ("ChiroChem").

                                    RECITALS

        WHEREAS, ChiroSub and CombiSub are the two members of ChiroChem, which
was formed pursuant to that certain Limited Liability Company Operating
Agreement dated as of December 1, 1998 (the "LLC Agreement");

        WHEREAS, as such, each of ChiroSub and CombiSub will from time to time
be obligated to make Capital Contributions to ChiroChem pursuant to the LLC
Agreement;

        WHEREAS, each of the parent companies of the members of ChiroChem
wishes, by this Agreement, to guarantee the prompt payment in full of said
Capital Contributions and the timely performance of the other obligations of its
wholly-owned subsidiary under the LLC Agreement;

        WHEREAS, because of the nature of ChiroChem's businesses, any of the
parties hereto may become aware of or receive information concerning business
opportunities that are derived directly from but outside of the stated purposes
of ChiroChem as set forth in the LLC Agreement;

        WHEREAS, the parties hereto wish to establish procedures and terms by
which each such business opportunity will be made available to one of the parent
companies in consideration for compensation to the other parent company;

        WHEREAS, CT Limited and CombiChem are sometimes referred to individually
as a "Parent" and collectively as the "Parents," and ChiroSub and CombiSub are
sometimes referred to individually as a "Member" and collectively as the
"Members;" and

        WHEREAS, terms not defined herein shall have the meanings given them in
the LLC Agreement.

                                    AGREEMENT

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





*** Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the Act.

<PAGE>   2

        1. GUARANTEES.

               1.1 DEFINITIONS. As used herein, the term "Guaranteed
Obligations" shall mean every debt, duty, undertaking, obligation, covenant and
condition to be paid or performed by a Member pursuant to the LLC Agreement,
including the obligation to make Capital Contributions from time to time.

               1.2 GUARANTIES. Each Parent unconditionally guarantees and
promises (each a "Guarantee") to and for the benefit of ChiroChem the full,
prompt and complete payment and performance by the Member that is its wholly
owned subsidiary, as and when due, of that Member's Guaranteed Obligations.

               1.3 NATURE OF GUARANTY. Each Guaranty is an original and
independent obligation of the Parent making it, separate and distinct from the
Guaranteed Obligations. A separate action may be brought or prosecuted against
the Parent, regardless of whether such an action is brought or prosecuted
against the corresponding Member or any other guarantor and regardless of
whether the Member or any other guarantor is joined in the action. Each Parent
acknowledges and agrees that its guaranty is a direct and absolute guarantee of
payment and performance and not merely a guarantee of collection. Each Parent
hereby waives any and all rights or legal requirements that ChiroChem institute
any action or proceeding, or exhaust any remedies, against the corresponding
Member or any collateral hereafter obtained by ChiroChem for the Guaranteed
Obligations or anyone else in respect of the Guaranteed Obligations as a
condition precedent to bringing an action against the Parent pursuant to this
Agreement.

               1.4 BANKRUPTCY NO DISCHARGE. Notwithstanding anything to the
contrary herein contained, this Agreement shall continue to be effective or
shall be reinstated, as the case may be, if at any time payment or performance
of all or any part of the Guaranteed Obligations is avoided or must otherwise be
restored or returned by ChiroChem upon the insolvency, bankruptcy or
reorganization of a Member or otherwise, all as though such payment or
performance had not been made. Notwithstanding any modification, discharge or
extension of the Guaranteed Obligations or any amendment, modification, stay or
cure of ChiroChem's rights which may occur in any bankruptcy or reorganization
case or proceeding concerning the Member, whether permanent or temporary, and
whether or not assented to by ChiroChem, the corresponding Parent shall be
obligated hereunder to pay all sums payable under the LLC Agreement and this
Agreement in performance of all duties now or hereafter arising.

               1.5 WAIVER OF DEFENSES. Each Parent hereby waives any defense
arising by reason of any disability of the corresponding Member or by reason of
the cessation from any cause whatsoever (other than full payment) of the
liability of the Member for any of the Guaranteed Obligations. Each Parent shall
be liable and remain liable for the payment and performance of the Guaranteed
Obligations to the full extent provided herein notwithstanding (a) any previous
discharge (partial or total) of the Member from any further liability; (b) any
bar (temporary, partial or total) to the pursuit by the Parent of any right or
claim for indemnification from the Member; (c) loss of any right or claim by the
Parent to be subrogated to the rights or claims of ChiroChem against the Member;
(d) any action or inaction or delay in acting by ChiroChem; or (e) ChiroChem's
failure to enforce, or delay in enforcing, any of its rights under the LLC
Agreement or otherwise.



                                       2
<PAGE>   3

               1.6 AMENDMENTS TO DOCUMENTS. Each Parent authorizes ChiroChem,
without notice, demand or consideration and without affecting the Parent's
liability hereunder, from time to time, to: (a) amend, change, release or cancel
any of the provisions of the LLC Agreement, by further agreement among ChiroChem
and the Members at any time, or by operation of law, without the consent of or
notice to the Parent; (b) extend the maturity, grant any indulgence or
forbearance or postpone the time of payment of any of the Guaranteed
Obligations; and (c) take and hold additional guarantees or collateral as
security for the performance and payment of the Guaranteed Obligations, and
apply, enforce, exchange, waive and release any guaranty now or hereafter held
by ChiroChem.

               1.7 WAIVER OF ACCEPTANCE, PRESENTMENTS AND NOTICES. Each Parent
waives notice of acceptance of this guaranty and all grace, demands for
performance, presentments, notices of default, protests, notices of protest, and
notices of dishonor.

               1.8 ATTORNEYS FEES. Each Parent agrees to pay all expenses,
including without limitation reasonable attorneys fees and costs, paid or
incurred by ChiroChem in any action to enforce, interpret or defend Section 1 or
any subsection thereof of this Agreement.

        2. REFERRALS OF BUSINESS OPPORTUNITIES.

               2.1 DEFINITIONS. As used herein, the following terms shall have
the following meanings:

        "Production Gross Profits" means all revenues received from the ***
resulting from a Production Opportunity less all expenses directly associated
with (as determined by U.S. Generally Accepted Accounting Procedures ("GAAP"))
the generation of such revenues including, but not limited to, withholding taxes
that are not recoverable in the foreseeable future.

        "Production Opportunity" means an expression of interest from a
potential customer or other apparent opportunity to *** to one or more third
party customers, *** (in *** ) derived directly from the activities of 
ChiroChem.

        "Research Gross Profits" means all revenue received from *** resulting
from a Research Opportunity less all expenses directly associated with (as
determined by GAAP) the generation of such revenues including, but not limited
to, withholding taxes that are not recoverable in the foreseeable future. ***
received from collaborators *** and all expenses associated with the *** are
specifically excluded from the definition of Research Gross Profits for such
collaborative agreements structured to *** on such service.



- --------
*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.



                                       3
<PAGE>   4

        "Research Opportunity" means *** from a potential customer or other
apparent opportunity to *** for the account of one or more third party customers
for compensation, *** activities to facilitate *** using *** derived directly
from the activities of ChiroChem.

               2.2 REFERRALS. In the event any party to this Agreement, *** a
Production Opportunity or a Research Opportunity which arises directly from the
activities of ChiroChem, it shall maintain the confidentiality of such
information and make it available to third parties only as provided herein. All
such information concerning a Production Opportunity shall be promptly provided
by the holder thereof to CT Limited, and all such information regarding a
Research Opportunity shall be promptly provided by the holder thereof to
CombiChem. The party receiving such information hereunder may consider whether
it wishes to pursue the described opportunity, which it may accept or reject in
its sole discretion, and it is under no obligation to any other party to do so.
If the opportunity is pursued, the receiving party shall periodically keep the
other parties reasonably informed of its business activities in pursuit of the
opportunity.

               2.3 COMPENSATION FOR PRODUCTION OPPORTUNITIES. If CT Limited
pursues a Production Opportunity and, as a result thereof, it earns Production
Gross Profits from the *** of *** in *** *** , it shall pay to CombiChem, as
consideration hereunder, a fee equal to *** of all such Production Gross
Profits. Said fee shall be paid in quarterly installments, made not later than
the 30th day after the close of each calendar quarter with respect to Production
Gross Profits earned during that calendar quarter. Each such payment shall be
made in U.S. dollars to the addresses or bank accounts designated by CombiChem.
If any currency conversion is required in connection with the payment of such
fees hereunder, such conversion shall be made by using the exchange rate as
quoted in the Wall Street Journal (U.S.A. edition) on the last business day of
the calendar quarter to which such payments relate. Such payments shall be
subject to any applicable legally required withholding or other taxes.

               2.4 COMPENSATION FOR RESEARCH OPPORTUNITIES. If CombiChem pursues
a Research Opportunity and, as a result thereof, it earns Research Gross Profits
from the conduct of *** using *** to facilitate *** , it shall pay to CT
Limited, as consideration hereunder, a fee equal to *** of all such Research
Gross Profits. Said fee shall be paid in quarterly installments, made not later
than the 30th day after the close of each calendar quarter with respect to
Research Gross Profits earned during that calendar quarter. Each such payment
shall be made in pounds sterling to the addresses or bank accounts designated by
CT Limited. If any currency conversion is required in connection with the
payment of such fees hereunder, such conversion shall be made by using the
exchange rate as quoted in the Wall Street Journal (U.S.A. edition) on the last
business day of the calendar quarter to which such payments relate. Such
payments shall be subject to any applicable legally required withholding or
other taxes.



- --------
*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.



                                       4
<PAGE>   5

               2.5 CT LIMITED REPORTS. Within thirty (30) days after the end of
each whole or partial calendar quarter during the term of this Agreement in
which CT Limited earns Production Gross Profits from the pursuit of a Production
Opportunity, CT Limited shall deliver to CombiChem a true and accurate report
giving such particulars of the businesses conducted by CT Limited during the
preceding whole or partial calendar quarter as the result of Production
Opportunities under this Agreement as are pertinent to a fee accounting under
this Agreement. Each such report shall include, for the reporting period, at
least the following:

                      a. For each Production Opportunity, the *** of each *** in
*** during the report period;

                      b. For each customer (identified by name) the Production
Gross Profits earned from such ***

                      c. Total fees due to CombiChem hereunder for such period;
and

                      d. The aggregate amount of any withholding taxes deducted
from the payment made in satisfaction of the fees stated pursuant to (c) above.

               2.6 COMBICHEM REPORTS. Within thirty (30) days after the end of
each whole or partial calendar quarter during the terms of this Agreement in
which CombiChem earns Research Gross Profits from the pursuit of a Research
Opportunity, CombiChem shall deliver to CT Limited a true and accurate report
giving such particulars of the businesses conducted by CombiChem during the
preceding whole or partial calendar quarter as the result of Research
Opportunities under this Agreement as are pertinent to a fee accounting under
this Agreement. Each such report shall include at least the following:

                      a. For each Research Opportunity, the *** of the ***
activities conducted;

                      b. For each customer (identified by name), the Research
Gross Profits earned on account of such activities (however denominated);

                      c. Total fees due to CT Limited hereunder for such period;
and

                      d. The aggregate amount of any withholding taxes deducted
from the payment made in satisfaction of the fees stated pursuant to (c) above.

               2.7 RECORDS. Each Parent shall keep (for at least six (6) years
after the making of a fee payment hereunder) complete and accurate books of
account containing all particulars which may be reasonably necessary for the
other Parent to confirm the accuracy of all payments of fees and reports due
hereunder. At the written request of the other Parent, each Parent shall make
such books and particulars available during normal business hours, upon
reasonable notice, for inspection by an independent certified public accountant
retained by the



- --------
*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.



                                       5
<PAGE>   6

other Parent for the purpose of verifying payments of fees and reports related
thereto. Such inspections shall be limited solely to those matters directly
related to fee and referral obligations under this Agreement.

               2.8 INSPECTION COSTS. If an inspection conducted by either
CombiChem or CT Limited pursuant to Section 2.7 reveals that CT Limited or
CombiChem, as the case may be, has made an error of seven percent (7%) or more
in favor of CT Limited or CombiChem, respectively, in the payment due either
CombiChem or CT Limited for the year to which the inspection pertains, CT
Limited shall reimburse CombiChem, and CombiChem shall reimburse CT Limited, as
the case may be, for the cost of the inspection.

        3. CORPORATE OPPORTUNITIES. Allocation and pursuit of business
opportunities as hereinabove described shall not constitute a misappropriation
of the corporate opportunities available to or belonging to ChiroChem. CT
Limited shall make available to CombiChem such of its own intellectual property
as may be necessary or convenient for CombiChem to pursue a Research
Opportunity, by technology license or otherwise, on commercially reasonable
terms. CombiChem shall make available to CT Limited such of its own intellectual
property as may be necessary or convenient for CT Limited to pursue a Production
Opportunity, by technology license or otherwise, on commercially reasonable
terms.

        4. TERM. The term of this Agreement shall commence on the date hereof 
and end on the earlier of (i) the date on which ChiroChem terminates and (ii)
the date on which it is no longer the case that both ChiroSub (or an Affiliate)
and CombiSub (or an Affiliate) are members in ChiroChem. Notwithstanding the
foregoing, each Parent's guaranty obligations under Section 1 shall survive
beyond the end of the term of this Agreement to the extent that Guaranteed
Obligations of the corresponding Member survive beyond said date, and the
obligations of Section 2 shall survive indefinitely beyond the end of the term
of this Agreement with respect to all Production Gross Profits or Research Gross
Profits earned at any time from Production Opportunities or Research
Opportunities.

        5. CONFIDENTIALITY. Except as provided herein, and except as reasonably
necessary to pursue a Production Opportunity or a Research Opportunity, during
the term of this Agreement all parties shall hold, and each party shall require
its Affiliates to hold, in confidence and not use for any purpose, or disclose
to any third party, information involving a Production Opportunity or a Research
Opportunity. The obligations of confidentiality set forth in this Section 5
shall not apply to the extent that (a) a disclosing party can demonstrate that
the information disclosed to a third party was in the public domain at the time
of disclosure, or thereafter became part of the public domain, other than as a
result of actions of the disclosing party or (b) the disclosure is required by
law, regulation or government or judicial order.

        6. MISCELLANEOUS

               6.1 AMENDMENT. Except as provided herein, this Agreement may be
amended only with the written consent of all parties.

               6.2 NOTICES. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally or by facsimile
transmission (receipt 



                                       6
<PAGE>   7

verified), or upon receipt if mailed by registered or certified mail (return
receipt requested), postage prepaid, or sent by express courier service (receipt
verified), to the parties at the following addresses (or at such other address
for a party as shall be specified by like notice; provided, that notices of a
change of address shall be effective only upon receipt thereof):

        If to CombiChem, addressed to:       CombiChem, Inc.
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attn:  President

        With a copy to:                      Chirotech Limited
                                             Cambridge Science Park
                                             Milton Road
                                             Cambridge CB4 4WE
                                             Attn:  Secretary

        And to:                              Brobeck Phleger & Harrison LLP
                                             550 West C Street, Suite 1300
                                             San Diego, CA 92101-3532
                                             Attn: Faye H. Russell, Esq.

        If to CombiSub, addressed to:        CombiChem JVR, Inc.
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attn:  President

        With a copy to:                      Chirotech Limited
                                             Cambridge Science Park
                                             Milton Road
                                             Cambridge CB4 4WE
                                             Attn:  Secretary

        And to:                              Brobeck Phleger & Harrison LLP
                                             550 West C Street, Suite 1300
                                             San Diego, CA 92101-3532
                                             Attn: Faye H. Russell, Esq.

        If to CT Limited, addressed to:      Chirotech Technology Limited
                                             Cambridge Science Park
                                             Milton Road
                                             Cambridge CB4 4WE
                                             England
                                             Attention:  Secretary



                                       7
<PAGE>   8

        With a copy to:                      CombiChem JVR, Inc.
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attn:  President

        And to:                              Chiroscience R&D, Inc.
                                             1631 220th Street SE
                                             Bothell, WA 98021 USA
                                             Attention:  Vice President and 
                                             General Counsel

        If to ChiroSub, addressed to:        Chirotech Limited
                                             Cambridge Science Park
                                             Milton Road
                                             Cambridge CB4 4WE
                                             England
                                             Attention:  Secretary

        With a copy to:                      CombiChem JVR, Inc.
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attn:  President

        And to:                              Chiroscience R&D, Inc.
                                             1631 220th Street SE
                                             Bothell, WA 98021 USA
                                             Attention:  Vice President and 
                                             General Counsel

        If to ChiroChem, addressed to:       ChiroChem Discovery Services LLC
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attention: Board of Managers

        With a copy to:                      CombiChem JVR, Inc.
                                             9050 Camino Santa Fe
                                             San Diego, CA 92121
                                             Attention: President

        And to:                              Chirotech Limited
                                             Cambridge Science Park
                                             Milton Road
                                             Cambridge CB4 4WE
                                             Attn:  Secretary



                                       8
<PAGE>   9

        And to:                              Brobeck Phleger & Harrison LLP
                                             550 West C Street, Suite 1300
                                             San Diego, CA 92101-3532
                                             Attn: Faye H. Russell, Esq.

        Any copy of a notice shall be sent at the same time as the original
notice.

               6.3 FURTHER ASSURANCES. The parties agree to execute and deliver
any further instruments or documents and perform any additional acts that are or
may become necessary to effectuate and carry out the obligations created by this
Agreement.

               6.4 CONSTRUCTION. Every covenant, term and provision of this
Agreement shall be construed simply according to its fair meaning and not
strictly for or against any party.

               6.5 TIME. In computing any period of time pursuant to this
Agreement, the day of the act, event or default from which the designated period
of time begins to run shall not be included, but the time shall begin to run on
the next succeeding day. The last day of the period so computed shall be
included, unless it is not a business day, in which event the period shall run
until the end of the next business day.

               6.6 HEADINGS. Section and other headings contained in this
Agreement are for reference purposes only and are not intended to describe,
interpret, define, or limit the scope, extent, or intent of this Agreement or
any provision hereof.

               6.7 SEVERABILITY. Except as otherwise provided in the succeeding
sentence, every provision of this Agreement is intended to be severable, and, if
any term or provision of this Agreement is illegal or invalid for any reason
whatsoever, such illegality or invalidity shall not affect the validity or
legality of the remainder of this Agreement. The preceding sentence of this
Section shall be of no force or effect if the consequence of enforcing the
remainder of this Agreement without such illegal or invalid term or provision
would be to cause any party to lose the material benefit of its economic
bargain.

               6.8 VARIATION OF TERMS. All terms and any variations thereof
shall be deemed to refer to masculine, feminine, or neuter, singular or plural,
as the identity of the Person or Persons may require.

               6.9 GOVERNING LAW. The laws of the State of California shall
govern the validity of this Agreement, the construction of its terms, and the
interpretation of the rights and duties arising hereunder.

               6.10 ARBITRATION. Any controversy between the parties hereto
arising out of or relating to this Agreement, or the breach thereof, shall be
settled by arbitration in San Francisco, California in accordance with the
then-applicable commercial arbitration rules of the American Arbitration
Association. Judgment upon the award rendered may be entered into any court
having jurisdiction thereof. The losing party shall bear the costs and expenses
of such arbitration.



                                       9
<PAGE>   10

               6.11 BINDING EFFECT. This Agreement shall be binding on and
inures to the benefit of the parties and their respective transferees,
successors, assigns and legal representatives.

               6.12 ENTIRE AGREEMENT. Without limiting the effect of the LLC
Agreement, the CT License, the CombiChem License, the CombiChem Services
Agreement, the CT Limited Services Agreement or the Chirotech Services
Agreement, this Agreement constitutes the entire agreement among the parties
with respect to the subject MATTER HEREIN.

               6.13 COUNTERPARTS.This Agreement may be executed in one or more
counterparts with the same force and effect as if each of the signatories had
executed the same instrument.

                [Remainder of This Page Intentionally Left Blank]



                                       10
<PAGE>   11

        IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date set forth above.




CHIROTECH TECHNOLOGY                         CHIROTECH LIMITED, a company 
LIMITED, a company organized                 organized and existing under the
and existing under the laws of England       laws of England and Wales
and Wales

By:     /s/  Christine H. Soden              By:     /s/  Christine H. Soden
    --------------------------------            --------------------------------
Name:    Christine H. Soden                  Name:     Christine H. Soden
     --------------------------------             ------------------------------
Title:   Director                            Title:    Director
      --------------------------------             -----------------------------





                          [SIGNATURE PAGE TO COOPERATION AGREEMENT]
<PAGE>   12

COMBICHEM, INC., a Delaware             COMBICHEM JVR, INC., a Delaware
corporation                             corporation


By:   /s/  Vicente Anido, Jr.           By:  /s/  Vicente Anido, Jr.
    --------------------------------         -----------------------------------
Name:   Vicente Anido, Jr.              Name:   Vicente Anido, Jr.
      ------------------------------          ----------------------------------
Title:  President & CEO                 Title:  President & CEO
       -----------------------------           ---------------------------------

CHIROCHEM DISCOVERY SERVICES LLC, a 
California limited liability company

By CHIROTECH LIMITED, a company 
organized and existing under the laws
of England and Wales, Member


By:     /s/  Christine H. Soden
    --------------------------------
Name:   Christine H. Soden
      ------------------------------
Title:  Director
      ------------------------------

And by COMBICHEM JVR, INC., a 
Delaware corporation,
Member


By:  /s/  Vicente Anido, Jr.
    --------------------------------
Name:  Vicente Anido, Jr.
      ------------------------------
Title:  President & CEO
      ------------------------------



               [CONTINUED SIGNATURE PAGE TO COOPERATION AGREEMENT]


<PAGE>   1
                                                                   EXHIBIT 10.66






                                LICENSE AGREEMENT
                                     BETWEEN
                                 COMBICHEM, INC.
                                       AND
                        CHIROCHEM DISCOVERY SERVICES LLC






*** Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the Act.

<PAGE>   2

                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                              PAGE
<S>                                                                           <C>
1. DEFINITIONS...................................................................1

        1.1    Defined Terms.....................................................1
        1.2    "Chiral Compound".................................................2
        1.3    "ChiroChem Technology"............................................2
        1.4    "Chirotech Technology"............................................2
        1.5    "CombiChem Technology"............................................2
        1.6    "CT License ".....................................................2
        1.7    "Field"...........................................................2
        1.8    "Licensed Product"................................................2
        1.9    "Net Sales".......................................................2
        1.10   "Patent Rights"...................................................2
        1.11   "Technology"......................................................3

2. GRANT OF LICENSES.............................................................3

        2.1    Grant to ChiroChem................................................3
        2.2    Retained Rights...................................................3
        2.3    Access............................................................3
        2.4    Third-Party Obligations...........................................3
        2.5    Grant to CombiChem................................................4

3. ROYALTIES.....................................................................4

        3.1    Royalties to CombiChem............................................4
        3.2    Payments..........................................................4

4. REPORTS AND RECORDS...........................................................4

        4.1    Records...........................................................4
        4.2    Reports...........................................................5
        4.3    Inspection Costs..................................................5

5. INFRINGEMENT..................................................................5

        5.1    Notice............................................................5
        5.2    Avoiding Infringement.............................................6

6. TERMINATION OR SOLE CONTROL OF CHIROCHEM......................................6

        6.1    Termination or Sole Control of ChiroChem and Effects Thereof......6
        6.2    Prior Rights and Obligations......................................7

7. CONFIDENTIALITY...............................................................7

        7.1    Confidentiality...................................................7
        7.2    Exceptions........................................................8
        7.3    Return of Confidential Information................................8
</TABLE>



                                       i
<PAGE>   3

<TABLE>
<S>                                                                           <C>
8. REPRESENTATIONS AND WARRANTIES................................................8

        8.1    CombiChem Representations and Warranties..........................8
        8.2    ChiroChem Representations and Warranties..........................9

9. INDEMNIFICATION...............................................................9

        9.1    Indemnification...................................................9
        9.2    Notice of Claims.................................................10

10. EXPORT CONTROLS.............................................................10

        10.1   Compliance With Laws.............................................10

11. MISCELLANEOUS PROVISIONS....................................................10

        11.1   Agency...........................................................10
        11.2   Assignment.......................................................10
        11.3   Further Actions..................................................11
        11.4   Notices..........................................................11
        11.5   Amendment; Approval..............................................12
        11.6   Waiver...........................................................12
        11.7   Counterparts.....................................................12
        11.8   Descriptive Headings.............................................12
        11.9   Governing Law; Venue; Dispute Resolution, Arbitration............12
        11.10  Severability.....................................................12
        11.11  Entire Agreement of the Parties..................................13
</TABLE>



                                       ii
<PAGE>   4

                                LICENSE AGREEMENT


        THIS LICENSE AGREEMENT (this "Agreement") dated as of December 1, 1998,
the ("Effective Date"), is by and between COMBICHEM, INC. ("CombiChem"), a
Delaware corporation, and CHIROCHEM DISCOVERY SERVICES LLC ("ChiroChem"), a
California limited liability company.

        WHEREAS, CombiChem JVR, Inc. ("CombiSub"), a wholly-owned subsidiary of
CombiChem, and Chirotech Limited ("ChiroSub"), a wholly-owned subsidiary of
Chirotech Technology Limited ("CT Limited"), are the two members of ChiroChem,
which was formed pursuant to that certain Limited Liability Company Operating
Agreement of ChiroChem Discovery Services LLC dated as of December 1, 1998 (the
"LLC Agreement");

        WHEREAS, CombiChem has developed, been licensed from a third party
and/or owns certain drug discovery technology and intellectual property rights,
including chemical library design software, multi-parallel synthesis and
purification methods, chemical libraries suitable for high throughput biological
screening assays and medicinal chemistry (collectively, the "CombiChem
Technology") useful for the design and production of single compound chemical
libraries;

        WHEREAS, CombiChem desires to license the CombiChem Technology to
ChiroChem on the terms set forth in this Agreement;

        WHEREAS, ChiroChem desires to obtain a license to the CombiChem
Technology on the terms set forth in this Agreement;

        WHEREAS, ChiroChem desires to license certain technology created by
ChiroChem resulting from the CombiChem Technology or the Chirotech Technology to
CombiChem on the terms set forth in this Agreement; and

        WHEREAS, CombiChem desires to obtain a license to certain technology
created by ChiroChem from the CombiChem Technology or the Chirotech Technology
on the terms set forth in this Agreement.

        NOW, THEREFORE, CombiChem and ChiroChem (the "parties") agree as
follows:


                                       1.

                                   DEFINITIONS

        1.1 Defined Terms. When used in this Agreement each of the following
terms shall have the meaning set forth in this Article 1. Capitalized terms not
otherwise defined herein shall have the meanings set forth in the LLC Agreement.
Unless the context otherwise requires, words importing the singular only shall
include the plural and vice versa and references to natural persons shall
include bodies corporate.


<PAGE>   5

        1.2 "CHIRAL COMPOUND" shall mean a chemical compound manufactured by or
on behalf of ChiroChem pursuant to rights granted in this Agreement and the CT
License.

        1.3 "CHIROCHEM TECHNOLOGY" shall mean the technology created by
ChiroChem during the Initial Term or any extension thereof which includes, and
is derivative of, the CombiChem Technology or the Chirotech Technology.

        1.4 "CHIROTECH TECHNOLOGY" shall mean the technology licensed by CT
Limited to ChiroChem under the CT License.

        1.5 "COMBICHEM TECHNOLOGY" shall mean the Technology described in
greater detail in Exhibit 1 hereto.

        1.6 "CT LICENSE " shall mean that certain License Agreement between CT
Limited and ChiroChem, executed on or about the Effective Date of this
Agreement.

        1.7 "FIELD" shall mean the use of Chirotech Technology and CombiChem
Technology to create libraries of Chiral Compounds for use in the
pharmaceutical, *** .

        1.8 "LICENSED PRODUCT" shall mean any product that is covered in whole
or in part by a claim in Patent Rights (as the case may be) included in the
CombiChem Technology or the Chirotech Technology; or any product manufactured by
or using a process that is covered in whole or in part by a claim in Patent
Rights (as the case may be) included in the CombiChem Technology or the
Chirotech Technology; or any product based on, developed or synthesized with or
which makes use of all or a portion of the Technology (as the case may be)
included in the CombiChem Technology or the Chirotech Technology, or any
services rendered by ChiroChem that relate to the CombiChem Technology, or the
Chirotech Technology.

        1.9 "NET SALES" shall mean the gross amount invoiced by or on behalf of
ChiroChem and its Affiliates and distributors for the sale of Licensed Products,
less (to the extent included in gross invoiced sales) the amount of: (a)
customary trade, cash and quantity discounts actually allowed and taken; (b)
allowances actually given for returned or rejected products; (c) actual charges
for bad debts; (d) freight and insurance if included in the price; (e)
government mandated and other rebates; and (f) value added tax, sales, use or
turnover taxes, excise taxes and customs duties included in the invoiced price.

        1.10 "PATENT RIGHTS" shall mean any of the patents and patent
applications applicable to Technology identified in Exhibit 1, and in respect of
such patents and patent applications, all corresponding Patent Co-operation
Treaty applications, European Patent Convention applications or applications
under similar administrative international conventions, and corresponding
national patents and patent applications, together with any divisional,
continuation (but not a 



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                                       2.
<PAGE>   6

continuation-in-part), substitution, reissue, extension, supplementary
protection certificate or other application based thereon.

        1.11 "TECHNOLOGY" shall mean the technology described in Exhibit 1
hereto (as such Exhibit may be modified or supplemented from time to time by
mutual written agreement of parties), and all ideas, know-how, trade secrets,
data, inventions, discoveries and other proprietary rights in and to such
technology, including Patent Rights applicable to such technology, that
CombiChem elects to provide to ChiroChem under this Agreement.


                                       2.

                                GRANT OF LICENSES

        2.1 Grant to ChiroChem. Subject to such use being provided under the
direction of a CombiChem employee pursuant to the CombiChem Services Agreement
or some other similar agreement, CombiChem hereby grants to ChiroChem, and
ChiroChem hereby accepts from CombiChem, a royalty-bearing, worldwide,
co-exclusive license (exclusive to ChiroChem and to CombiChem and CombiChem's
Affiliates), with no right to sublicense, to use the CombiChem Technology to
make, have made, use, import and sell Licensed Products solely in the Field.

        2.2 Retained Rights. CombiChem and its Affiliates retain the worldwide
right under the CombiChem Technology to make, have made, use, import, sell and
license products, including libraries of chemical compounds, for any use and any
indication in any field; provided that, until the termination of this Agreement
pursuant to Section 6 hereof, CombiChem and its Affiliates shall not use the
Technology described in Exhibit 1 (as amended from time to time) to design,
synthesize and market libraries of chiral chemical compounds for sale or license
to third parties, though CombiChem and its Affiliates retain the right to use
such Technology for their internal use and to satisfy any obligations they may
have under any of their collaboration agreements with third parties (whether
currently existing or entered into in the future) with respect to libraries of
chemical compounds other than libraries of chiral chemical compounds.

        2.3 Access. Promptly after the Effective Date, and thereafter during the
term of this Agreement, the FTEs provided to ChiroChem by CombiChem (or some
other party), pursuant to the CombiChem Services Agreement (or some other
agreement) shall have complete access to the CombiChem Technology provided that
such access is under the direction of a CombiChem employee.

        2.4 Third-Party Obligations. If any components of the CombiChem
Technology are subject to restrictions or obligations imposed on CombiChem by
third-party licensors, CombiChem shall disclose such restrictions or obligations
to ChiroChem in writing, in Exhibit 1 or thereafter in timely fashion, if such
restrictions or obligations restrict the use to which ChiroChem can put such
components of the CombiChem Technology (e.g., restrict the field of use) or if
they entail royalty or payment obligations to a third-party licensor, whether or
not ChiroChem shall be obligated to pay such royalty or payment obligations.
ChiroChem shall 



                                       3.
<PAGE>   7

abide by any such disclosed field-of-use restrictions or similar restrictions;
provided that, as to royalty or payment obligations to third-party licensors,
CombiChem, not ChiroChem, shall be liable for, and shall pay, such obligations
to such third parties when due (subject to the provisions in Section 6.1) unless
otherwise agreed in writing.

        2.5 Grant to CombiChem. ChiroChem hereby grants to CombiChem, and
CombiChem hereby accepts from ChiroChem, a royalty-free, worldwide,
non-exclusive license, with no right to sublicense, to use the ChiroChem
Technology in connection with any Research Opportunity (as defined in that
certain Cooperation Agreement between the parties, among others, dated as of the
date hereof).


                                       3.

                                    ROYALTIES

        3.1 Royalties to CombiChem. In consideration for the rights granted
under this Agreement, ChiroChem shall pay to CombiChem an amount equal to *** of
Net Sales until the cumulative Net Sales exceed *** and thereafter an amount
equal to *** of Net Sales. The parties agree that this represents a commercially
reasonable royalty rate for the license of the CombiChem Technology under this
Agreement.

        3.2 Payments. ChiroChem's payments of royalties to CombiChem in
accordance with Section 3.1 will be due and payable within thirty (30) days
after the end of each calendar quarter (March 31, June 30, September 30, and
December 31) commencing with the first calendar quarter in which Net Sales shall
occur, if and to the extent ChiroChem has sufficient cash on hand at the time
such payments are due to pay such royalties and any royalties due at such time
to CT Limited under the CT License. If in the reasonable judgment of the Board
of Managers, ChiroChem lacks sufficient cash at such time to pay such royalties
in full, ChiroChem's unpaid royalty obligations shall accrue, together with
interest thereon in the amount of twelve percent (12%) per annum (or such lesser
amount if required by law) from the date such royalties were initially due and
payable until they are paid, and ChiroChem shall pay such royalties and accrued
interest as soon as such cash becomes available. Such payments shall be made in
United States Dollars to the address or bank account designated by CombiChem. If
any currency conversion is required in connection with the payment of amounts
hereunder, such conversion shall be made by using the exchange rate as quoted by
the Wall Street Journal (U.S.A. Edition) on the last business day of the
calendar quarter to which such payments relate. Payments hereunder shall be
subject to any applicable, legally required withholding or other taxes.



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                                       4.
<PAGE>   8

                                       4.

                               REPORTS AND RECORDS

        4.1 Records. ChiroChem shall keep (for at least six (6) years after the
making of a royalty payment hereunder) complete and accurate books of account
containing all particulars which may be reasonably necessary for CombiChem to
confirm the accuracy of all payments of royalties due hereunder. At the written
request of CombiChem, ChiroChem shall make such books and particulars available
during normal business hours, upon reasonable notice, for inspection by an
independent certified public accountant retained by CombiChem for the purpose of
verifying ChiroChem's payments of royalties and the accuracy of ChiroChem's
reports related thereto. Such inspections shall be limited solely to those
matters directly related to royalty obligations under this Agreement.

        4.2 Reports. Within thirty (30) days after December 31 of each year in
which Net Sales occur, ChiroChem shall deliver to CombiChem true and accurate
reports giving such particulars of the business conducted by ChiroChem during
the preceding twelve (12) month period under this Agreement as are pertinent to
a royalty accounting under this Agreement.
These reports shall include at least the following:

               (a) All Licensed Products manufactured and sold, by country;

               (b) Total billings for Licensed Products sold by or on behalf of
ChiroChem and its Affiliates and any distributors;

               (c) Deductions applicable and calculations leading to Net Sales;

               (d) Total royalties due to CombiChem for such year; and

               (e) The aggregate amount of any withholding taxes deducted from
the payment made in satisfaction of the royalties stated pursuant to (d) above.

        In addition to the above-described annual report, within thirty (30)
days after the end of the three other calendar quarters (March 31, June 30, and
September 30) commencing with the first calendar quarter in which Net Sales
occur, ChiroChem shall deliver to CombiChem a true and accurate report
describing at least total billings for Licensed Products in the quarter to which
such report pertains, Net Sales, and total royalties due CombiChem for such
quarter (whether or not ChiroChem actually pays such royalties at such time).

        4.3 Inspection Costs. If an inspection conducted on behalf of CombiChem
pursuant to Section 4.1 reveals that ChiroChem has made an error of seven
percent (7%) or more in ChiroChem's favor in the payment due CombiChem for the
year to which the inspection pertains, ChiroChem shall reimburse CombiChem for
the cost of the inspection.



                                       5.
<PAGE>   9

                                       5.

                                  INFRINGEMENT

        5.1 Notice. CombiChem and ChiroChem shall promptly notify the other of
any potential infringement of or misappropriation by a third party of the
CombiChem Technology. CombiChem shall have the right, but not the obligation, at
its expense, to bring, defend and maintain any proceeding it deems advisable
involving any such infringement or misappropriation and shall retain all
recovery from any infringer. ChiroChem shall have the right, but not the
obligation, at its expense, to bring, defend and maintain any proceeding it
deems advisable involving any such infringement or misappropriation if CombiChem
does not bring, defend or maintain any such proceeding; ChiroChem shall retain
all recovery from any infringer if it brings any such proceeding.

        5.2 Avoiding Infringement. ChiroChem shall use reasonable efforts to
avoid infringement of patent rights and other intellectual property rights of
any third party in the research, development and commercialization of the
CombiChem Technology and Licensed Products.


                                       6.

                    TERMINATION OR SOLE CONTROL OF CHIROCHEM

        6.1 Termination or Sole Control of ChiroChem and Effects Thereof. This
Agreement shall terminate upon the termination of ChiroChem or when it is no
longer the case that both ChiroSub (or an Affiliate) and CombiSub (or an
Affiliate) are members in ChiroChem ("Sole Control"); provided, however, that
the license granted in Section 2.1 above shall survive termination of this
Agreement insofar as, and only to the extent that, such license relates to and
enables the continued manufacture and sale of libraries of Chiral Compounds
developed by or on behalf of ChiroChem prior to the termination of this
Agreement ("ChiroChem Libraries"). The rights to such ChiroChem Libraries
following the termination of ChiroChem shall be determined in accordance with
the provisions of the LLC Agreement. The entity(ies) retaining or receiving
rights to commercialize such ChiroChem Libraries following Sole Control or the
termination of ChiroChem shall succeed to the license rights granted to
ChiroChem in Section 2.1 of this Agreement solely to the extent necessary to
commercialize such ChiroChem Libraries developed under the LLC Agreement, but
such entity(ies) shall have no further obligations to pay royalties to CombiChem
under Section 3.1 of this Agreement in connection with the sale of such
ChiroChem Libraries; provided, however, that, as a condition of such limited
continuation of the license granted herein, (i) such successor entity(ies) shall
pay and account for any royalty or payment obligations due to any third-party
licensors (excluding Affiliates of CombiChem) in connection with any third-party
licenses to CombiChem of any component of CombiChem Technology ("Third-Party
Obligations") to the extent such Third-Party Obligations pertain to sales of
ChiroChem Libraries by such successor entity(ies), if but only if CombiChem had
previously disclosed such royalty or payment obligations in writing to ChiroChem
as provided in 



                                       6.
<PAGE>   10

Section 2.4; and (ii) such successor entity(ies) shall succeed to, be bound by
and perform the obligations of ChiroChem under Articles 7, 9, 10 and 11 of this
Agreement. The successor entity(ies) shall make any such payments and
accountings directly to such third-party licensor(s) at the address(es) to be
provided by CombiChem, with copies of such payments and accountings to
CombiChem. As one of the conditions of the survival of the licenses granted in
Section 2.1, CombiChem shall retain the right to enforce against the successor
entity(ies) (a) the payment of and accounting for such Third-Party Obligations,
and (b) the obligations under Articles 7, 9, 10 and 11, in accordance with the
terms of this Agreement. If CombiChem fails to disclose applicable Third-Party
Obligations to ChiroChem as provided in Section 2.4, CombiChem, but not the
successor entity(ies), shall be liable for and shall pay such Third-Party
Obligations.

        As a hypothetical example of the above-described effects of Sole Control
or the termination of ChiroChem on the license granted in this Agreement (solely
for the sake of clarification), if ChiroSub were to acquire the interest of
CombiSub in ChiroChem in accordance with the LLC Agreement, ChiroChem would
thereafter have a license under the CombiChem Technology to make, use and sell
copies of ChiroChem Libraries developed by or on behalf of ChiroChem prior to
the termination of this Agreement, but ChiroChem would have no other rights or
license under the CombiChem Technology to make, use or sell new libraries of
compounds not previously developed by or on behalf of ChiroChem. If ChiroChem
were then to terminate, ChiroSub would thereafter have a license (succeeding to
the interest of ChiroChem) under the CombiChem Technology to make, use and sell
copies of ChiroChem Libraries developed by or on behalf of ChiroChem prior to
the termination of ChiroChem, but ChiroSub would have no other rights or license
under the CombiChem Technology, including (without limitation) no right or
license under the CombiChem Technology to make, use or sell new libraries of
compounds not previously developed by or on behalf of ChiroChem. ChiroSub would
have no obligation to pay royalties to CombiChem under Section 3.1 in connection
with the sale of ChiroChem Libraries, but it would be required, as a condition
of its limited license under the CombiChem Technology, to pay any Third-Party
Obligations incurred in connection with such sales (directly to the third party)
if CombiChem had previously disclosed such Third-Party Obligations to ChiroChem
as provided in Section 2.4. ChiroSub's limited license under the CombiChem
Technology would automatically terminate upon its cessation of the sale of
ChiroChem Libraries (or sooner in the event of its unremedied breach of
obligations hereunder). All rights in the Licensed Technology would then
automatically revert to CombiChem.

        Upon termination or Sole Control of ChiroChem, (i) CT Limited and
CombiChem shall cooperate to prepare and execute such instruments as are
reasonably necessary to give effect to the above and (ii) only to the extent
reasonably necessary for the successor entity(ies) to execute the limited
license rights described above, CombiChem shall provide, at its direct cost, at
least one (1) FTE skilled in the use of the CombiChem Technology to assist and
enable the successor entity(ies), as necessary, to continue the manufacture of
ChiroChem Libraries as provided above.

        6.2 Prior Rights and Obligations. Termination of this Agreement shall
not affect any rights or obligations accrued prior to the effective date of such
termination.



                                       7.
<PAGE>   11

                                       7.

                                 CONFIDENTIALITY

        7.1 Confidentiality. During the term of this Agreement and for a period
of five (5) years thereafter (and longer to the extent license rights continue
under Section 6.1), ChiroChem shall hold, and it shall require ChiroSub and
ChiroSub's Affiliates to hold, in confidence and not use for any purpose, except
as expressly permitted in writing by CombiChem, or disclose to any third party
(except as necessary to reliable employees and to ChiroSub, CombiSub and their
Affiliates and their employees under similar secrecy obligations) all CombiChem
Technology (whether disclosed in written or oral form) and other confidential or
proprietary information provided by CombiChem to ChiroChem. ChiroChem, ChiroSub
and ChiroSub's Affiliates shall make no research or commercial use of the
CombiChem Technology except for the purpose of this Agreement and the LLC
Agreement; provided, however, that these obligations shall not apply under the
circumstances described in Section 6.1.

        7.2 Exceptions. The obligations of confidentiality set forth in Section
7.1 shall not apply to the extent that ChiroChem can demonstrate: (a) that the
disclosed information was in the public domain at the time of disclosure, or
thereafter became part of the public domain, other than as a result of actions
of ChiroChem, ChiroSub, ChiroSub's Affiliates or anyone (other than CombiSub) to
whom they disclosed such information; (b) by its written records, that the
disclosed information was rightfully known by ChiroChem (excluding CombiChem and
its Affiliates), ChiroSub or its Affiliates prior to the date of disclosure; (c)
the disclosed information was received by ChiroChem, ChiroSub or any of its
Affiliates from a third party not under a duty of confidentiality to CombiChem
or any of its Affiliates; (d) by its written records, that the disclosed
information was independently developed by ChiroChem, ChiroSub or any of its
Affiliates without use of the disclosed information; or (e) the disclosure is
required by law, regulation or government or judicial order, provided, however,
that CombiChem is given notice prior to any such disclosure sufficient to enable
it to try to obtain confidential treatment of such information; provided further
that information disclosed under this exception (e) shall continue otherwise to
be subject to Section 7.1 following such disclosure unless exception (a)
thereafter applies.

        7.3 Return of Confidential Information. Upon termination of this
Agreement, and subject to Section 7.2 above, at the written request of
CombiChem, ChiroChem will return, destroy or delete all confidential or
proprietary information received from CombiChem and its Affiliates, all
documents and electronic databases to the extent incorporating such confidential
or proprietary information, and all copies thereof, provided that ChiroChem may
retain (in hard copy and on-line) one (1) copy of such confidential or
proprietary information solely for archival purposes and for no other use.



                                       8.
<PAGE>   12

                                       8.

                         REPRESENTATIONS AND WARRANTIES

        8.1 CombiChem Representations and Warranties. CombiChem hereby
represents and warrants as follows:

               (a) CombiChem has the legal power, authority and right to enter
into this Agreement and to perform all of its respective obligations set forth
herein.

               (b) CombiChem is not a party to any agreement with any third
party which prevents CombiChem from fulfilling any of its material obligations
under the terms of this Agreement.

               (c) CombiChem has sufficient right, title or interest in the
CombiChem Technology to grant the rights granted herein. To the present
knowledge of the Chief Executive Officer of CombiChem (as of the Effective Date
of this Agreement), no third party has claimed to CombiChem that the CombiChem
Technology infringes any third-party patent rights or other intellectual
property rights. The CombiChem Technology may, however, be subject to certain
obligations to third parties to be disclosed by CombiChem in accordance with
Section 2.4.

               (d) COMBICHEM HEREBY DISCLAIMS ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, WHETHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE COMBICHEM
TECHNOLOGY OR ANY LICENSED PRODUCT BASED THEREON, OR ANY REPRESENTATION OR
WARRANTY THAT THE COMBICHEM TECHNOLOGY OR ANY LICENSED PRODUCT ENCOMPASSING THE
COMBICHEM TECHNOLOGY WILL NOT INFRINGE ANY THIRD PARTY'S PATENT RIGHTS OR OTHER
INTELLECTUAL PROPERTY RIGHTS.

        8.2 ChiroChem Representations and Warranties. ChiroChem hereby
represents and warrants as follows:

               (a) ChiroChem has the legal power, authority and right to enter
into this Agreement and to perform all of its respective obligations set forth
herein.

               (b) ChiroChem is not a party to any agreement with any third
party which prevents ChiroChem from fulfilling any of its material obligations
under the terms of this Agreement.

               (c) ChiroChem will comply in all material respects with the terms
of the license granted to it under this Agreement and with all federal, state
and local laws, rules and regulations applicable to the development,
manufacture, distribution, import and export and sale of Licensed Products.



                                       9.
<PAGE>   13

                                       9.

                                 INDEMNIFICATION

        9.1 Indemnification. ChiroChem shall defend, indemnify and hold
CombiChem and its directors, officers, employees, and agents (the "Indemnitees")
harmless from and against any and all loss, claims, damages, liabilities joint
and several, expenses, judgments, fines, settlements and other amounts arising
from any and all claims (including reasonable legal expenses and reasonable
attorneys' fees), demands, actions, suits or proceedings (civil, criminal,
administrative or investigative) of any kind, on any theory, in which an
Indemnitee may be involved, as a party or otherwise, based on or arising out of
actions undertaken in the exercise of rights granted under this Agreement,
including, without limitation, the research, development, commercialization,
sale or use of Licensed Products; provided that ChiroChem shall not be obligated
to Indemnitees under this Section 9.1 to the extent such claims, demands,
actions, suits or proceedings are based on or arise out of CombiChem's breach of
its representations or warranties in Section 8.1 above. The indemnification of
CombiChem by ChiroChem under this Section shall in no way be construed to grant
any indemnification rights which are otherwise excepted from indemnification in
any of the Combi Ancillary Agreements.

        Expenses (including attorneys' fees) incurred by an Indemnitee in
defending any proceeding described above shall be paid by ChiroChem in advance
of the final disposition of such proceeding upon receipt of an undertaking by or
on behalf of the Indemnitee to repay such amount if it shall ultimately be
determined that the Indemnitee is not entitled to be indemnified by ChiroChem as
authorized hereunder.

        The indemnification and other obligations described above in this
Section 9.1 shall not be deemed to be exclusive of any other rights to which any
Indemnitee may be entitled under any agreement, or as a matter of law, or
otherwise.

        9.2 Notice of Claims. The Indemnitee shall notify ChiroChem promptly in
writing of any claims, demands, actions or suits against it of the sort
described above and shall cooperate reasonably with ChiroChem, at ChiroChem's
expense, in the defense of any such claims, demands, actions and suits, which
defense shall be controlled by ChiroChem; provided that the Indemnitee shall at
all times have the right to participate in such defense at its own expense (or
at ChiroChem's expense should ChiroChem fail to perform its obligations under
Section 9.1).


                                       10.

                                 EXPORT CONTROLS

        10.1 Compliance With Laws. ChiroChem shall not sell, transfer, export or
reexport any technology licensed hereunder, except in compliance with all
applicable laws, including the export laws of any government agency of the
United States or the United Kingdom and any regulations thereunder, and will not
sell, transfer, export or reexport any of the technology 



                                      10.
<PAGE>   14

licensed hereunder to any persons with regard to which there exist grounds to
suspect or believe that they are violating such laws or regulations. ChiroChem
shall be solely responsible for obtaining all licenses, permits and
authorizations required from any other government agency for the export or
reexport of such technology or Licensed Products.


                                       11.

                            MISCELLANEOUS PROVISIONS

        11.1 Agency. Neither party is, nor shall be deemed to be, an employee,
agent, co-venturer or legal representative of the other party for any purpose.
Neither party shall be entitled to enter into any contracts in the name of, or
on behalf of the other party, nor shall either party be entitled to pledge the
credit of the other party in any way or hold itself out as having the authority
to do so.

        11.2 Assignment. Subject only to Section 6.1 of this Agreement (and on
the terms and conditions set forth therein), ChiroChem may not assign or
otherwise transfer this Agreement or any rights or obligations set forth herein
without the prior written approval of CombiChem, which CombiChem may grant or
withhold in its discretion. CombiChem can assign this Agreement at any time to
any Affiliate or to any successor by merger or sale of substantially all of its
business unit to which this Agreement relates. This Agreement shall be binding
upon the successors and permitted assignees of the parties, and the name of a
party appearing herein shall be deemed to include the names of such party's
successors and permitted assignees to the extent necessary to carry out the
intent of this Agreement. Any assignment not in accordance with this Section
shall be void.

        11.3 Further Actions. Each party 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
Agreement.

        11.4 Notices. All notices and other communications required or permitted
hereunder shall be in writing and shall be deemed effectively given and received
(a) upon personal delivery; (b) upon receipt if mailed by registered or
certified mail, return receipt requested, postage prepaid, addressed to the
recipients at their addresses as listed below (or at such other address for a
recipient as a party shall specify by notice in accordance with this Section);
or (c) upon confirmed delivery by express commercial courier service (receipt
verified) to the recipients at their addresses as listed below (or at such other
address for a recipient as a party shall specify by notice in accordance with
this Section):

        If to ChiroChem, addressed to:      ChiroChem Discovery Services LLC
                                            9050 Camino Santa Fe
                                            San Diego, CA  92121
                                            Attention:  Board of Managers



                                      11.
<PAGE>   15

        With a copy to:                     CombiChem JVR, Inc.
                                            9050 Camino Santa Fe
                                            San Diego, CA  92121
                                            Attention:  President

        And to:                             Chirotech Limited
                                            Cambridge Science Park
                                            Milton Road
                                            Cambridge CB4 4WE
                                            Attn:  Secretary

        And to:                             Brobeck Phleger & Harrison LLP
                                            550 West C Street, Suite 1300
                                            San Diego, CA 92101-3532
                                            Attn:  Faye H. Russell, Esq.

        If to CombiChem, addressed to:      CombiChem, Inc.
                                            9050 Camino Santa Fe
                                            San Diego, CA 92121
                                            Attn:  President

        With a copy to:                     Chirotech Limited
                                            Cambridge Science Park
                                            Milton Road
                                            Cambridge CB4 4WE
                                            Attn:  Secretary

        And to:                             Brobeck Phleger & Harrison LLP
                                            550 West C Street, Suite 1300
                                            San Diego, CA 92101-3532
                                            Attn:  Faye H. Russell, Esq.

        Any copy of a notice shall be sent at the same time as the original
notice.

        11.5 Amendment; Approval. No amendment, modification or supplement of
any provision of the Agreement shall be valid or effective unless made in
writing and signed by a duly authorized officer of each party. No approval
provided for in this Agreement shall be valid or effective unless confirmed in
writing.

        11.6 Waiver. No provision of the Agreement shall be waived by any act,
omission or knowledge of a party or its agents or employees except by an
instrument in writing expressly waiving such provision and signed by a duly
authorized officer of the waiving party.

        11.7 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one instrument.



                                      12.
<PAGE>   16

        11.8 Descriptive Headings. The descriptive headings of this Agreement
are for convenience only, and shall be of no force or effect in construing or
interpreting any of the provisions of this Agreement.

        11.9 Governing Law; Venue; Dispute Resolution, Arbitration. This
Agreement shall be governed by and interpreted in accordance with the
substantive laws of the State of California. The parties shall attempt to
resolve any dispute or controversy that should arise between them quickly and
amicably. Any unresolved dispute or controversy between them arising out of or
relating to this Agreement, or the breach thereof, shall be settled by binding
arbitration in accordance with the then-applicable commercial arbitration rules
of the American Arbitration Association. Exclusive venue of any arbitration
proceeding commenced by either party to enforce its rights hereunder shall be
and remain in San Francisco, California, unless the parties mutually agree
otherwise in writing. Judgment upon an arbitration award may be entered into,
and enforced by, any court in any venue having jurisdiction thereof. The party
substantially losing the arbitration proceeding shall bear the costs and expense
of such arbitration and shall reimburse the other party for its reasonable
expenses incurred in connection with the arbitration, including reasonable
attorney's fees.

        11.10 Severability. Whenever possible, each provision of this Agreement
will be interpreted in such manner as to be effective and valid under applicable
law, but if any provision of this Agreement is held to be prohibited by or
invalid under applicable law, such provision will be ineffective only to the
extent of such prohibition or invalidity, without invalidating the remainder of
the Agreement. In the event of such invalidity, the parties shall seek to agree
on an alternative enforceable provision that preserves the original purpose of
this Agreement.

        11.11 Entire Agreement of the Parties. Without limiting the effect of
the LLC Agreement, the Cooperation Agreement, the CT License, the CombiChem
Services Agreement, the CT Limited Services Agreement or the Chirotech Services
Agreement, this Agreement, including Exhibit 1 attached hereto, constitutes and
contains the complete, final and exclusive understanding and agreement of the
parties hereto with respect to the subject matter hereof, and cancels and
supersedes any and all prior negotiations, correspondence, understandings and
agreements, whether oral or written, between the parties respecting the subject
matter hereof.

                [Remainder of This Page Intentionally Left Blank]



                                      13.
<PAGE>   17

        IN WITNESS WHEREOF, CombiChem and ChiroChem have caused this Agreement
to be duly executed as of the Effective Date set forth above.


CHIROCHEM DISCOVERY                     COMBICHEM, INC., a Delaware 
SERVICES LLC, a California limited      corporation
liability company

By CHIROTECH LIMITED, a company         By:      /s/   Vicente Anido, Jr.
organized and existing under the              ----------------------------------
laws of England and Wales,              Name:    Vicente Anido, Jr.   
Member                                         ---------------------------------
                                        Title:   President & CEO
                                               ---------------------------------
By:     /s/  Christine H. Soden
    ----------------------------------
Name:   Christine H. Soden
      --------------------------------
Title:  Director
       -------------------------------

And by COMBICHEM JVR, INC., a 
Delaware corporation,
Member


By:       /s/  Vicente Anido, Jr.
    ----------------------------------
Name:    Vicente Anido, Jr.
       -------------------------------
Title:  President & CEO
       -------------------------------





                 [SIGNATURE PAGE TO COMBICHEM LICENSE AGREEMENT]
<PAGE>   18

                                    EXHIBIT 1
                              COMBICHEM TECHNOLOGY

CombiChem hereby provides the following *** technology to ChiroChem under this
License Agreement.

                                       ***







- ----------

*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.

<PAGE>   19


               ***                 TECHNOLOGY

                                       ***











- ----------

*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.


<PAGE>   1
                                                                   EXHIBIT 10.67



                               SERVICES AGREEMENT


         THIS SERVICES AGREEMENT (this "Agreement") is made as of December 1,
1998 (the "Effective Date") by and among COMBICHEM, INC., a Delaware corporation
("CombiChem"), and CHIROCHEM DISCOVERY SERVICES LLC, a limited liability company
organized under the laws of California ("ChiroChem").

                                    RECITALS

         WHEREAS, CombiChem JVR, Inc. a Delaware corporation and wholly owned
subsidiary of CombiChem ("CombiSub"), has entered into a Limited Liability
Company Operating Agreement dated the date hereof (the "LLC Agreement") with
Chirotech Limited (Registration No. 3580272), a company organized and existing
under the laws of England and Wales ("ChiroSub"). Capitalized terms not defined
herein shall have the meanings given them in the LLC Agreement.

         WHEREAS, ChiroChem desires that CombiChem provide certain services to
ChiroChem, and CombiChem desires to provide such services, on the terms set
forth herein.

         NOW, THEREFORE, in consideration of the mutual covenants set forth
herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, CombiChem and ChiroChem hereby
agree as follows:

         1. SERVICES. CombiChem shall supply ChiroChem with the services set
forth on Schedule 1 hereto. Such services shall be provided by CombiChem , as
agreed by the parties, at reasonable times and upon reasonable notice. The list
of services set forth on Schedule 1 may be amended by mutual agreement of the
parties from time to time to include such other services as shall be agreed to
by CombiChem and the Board of Managers of ChiroChem (as defined in the LLC
Agreement). In performing the services hereunder, CombiChem will use the same
degree of care and skill that it uses in connection with performance of the same
or similar services for its own account.

         2.       COMPENSATION; INVOICES.

                  2.1 INTERNAL SERVICES. ChiroChem shall pay to CombiChem an 
amount equal to                    ***
                                   ***.

                  2.2 THIRD-PARTY SERVICES. For third-party services arranged by
CombiChem and provided to ChiroChem, such third parties shall invoice ChiroChem
directly, and ChiroChem shall pay such third parties directly.

                  2.3 CALCULATION OF COSTS. CombiChem's costs of providing the
services hereunder shall be determined using CombiChem's internal cost
accounting system.



*** Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the Act.

<PAGE>   2

                  2.4 SERVICE FEE. The parties *** amount payable under Sections
2.1 or 2.2 of this Agreement. Such fees shall *** *** .

                  2.5 INVOICES. CombiChem shall invoice ChiroChem no later than
the last day of each calendar quarter for the services to be provided by
CombiChem to ChiroChem for the following quarter. Such quarterly invoices shall
conform to the quarterly amounts, including allowed variances set forth in the
LLC Agreement, specified in the Annual Budget (as defined in the LLC Agreement)
and, if applicable, shall also include any credits for overpayment or deductions
for underpayment for the second immediately preceding quarter, e.g., an invoice
for the third quarter would include a credit for an overpayment, if any, made
for the services performed in the first quarter. ChiroChem shall remit to
CombiChem the full amount of such quarterly invoices within 15 days after
receipt.

         3.       TERM AND TERMINATION.

                  3.1 TERM. This Agreement shall terminate on the earlier of (a)
three (3) years after the Effective Date or (b) the termination of ChiroChem.
This Agreement shall be extended for a additional three-year terms coincident
with any extension of the LLC Agreement, subject to termination prior to the end
of the extended term upon the termination of ChiroChem.

                  3.2 TERMINATION BY CHIROCHEM. ChiroChem shall have the right
to terminate this Agreement, by notice to CombiChem, effective at any time, if
CombiChem fails to perform or observe or otherwise breaches any of its material
obligations under this Agreement and such failure or breach continues unremedied
for a period of sixty (60) days after receipt by CombiChem of written notice
thereof, subject to Section 5.

                  3.3 TERMINATION BY COMBICHEM. CombiChem shall have the right
to terminate this Agreement at any time and effective as set forth below:

                           3.3.1 BANKRUPTCY PROCEEDINGS. At any time, effective
as set forth in a written notice to ChiroChem, if ChiroChem shall (i) seek the
liquidation, reorganization, dissolution or winding-up of itself or the
composition or readjustment of its debts, (ii) apply for or consent to the
appointment of, or the taking possession by, a receiver, custodian, trustee or
liquidator for itself or of all or a substantial part of its assets, (iii) make
a general assignment for the benefit of its creditors, (iv) commence a voluntary
case under the Bankruptcy Code, (v) file a petition seeking to take advantage of
any other law relating to bankruptcy, insolvency, reorganization, winding-up or
composition or readjustment of debts or (vi) adopt any resolution of its members
for the purpose of effecting any of the foregoing; or

                           3.3.2 INVOLUNTARY BANKRUPTCY PROCEEDINGS. At any 
time, effective as set forth in a written notice to ChiroChem if a proceeding or
case shall be commenced without the application or consent of ChiroChem and such
proceeding or case shall continue undismissed, or an order, judgment or decrees
approving or ordering any of the following shall



- --------

*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.



                                       2
<PAGE>   3

be entered and continued unstayed and in effect, for a period of forty-five (45)
days from and after the date service of process is effected upon ChiroChem
seeking (i) ChiroChem's liquidation, reorganization, dissolution or winding-up,
or the composition or readjustment of its debts, (ii) the appointment of a
trustee, receiver, custodian, liquidator or the like of ChiroChem or of all or
any substantial part of its assets or (iii) similar relief in respect of
ChiroChem under any law relating to bankruptcy, insolvency, reorganization,
winding-up or the composition or readjustment of debts; or

                           3.3.3 FAILURE TO PAY. If any invoice from CombiChem
(which is not disputed on any reasonable grounds) remains outstanding and unpaid
for more than sixty (60) days.

                           3.3.4 SOLE CONTROL OF CHIROCHEM. When it is no longer
the case that both ChiroSub (or an Affiliate) and CombiSub (or an Affiliate) are
members in ChiroChem.

         4. INDEMNIFICATION. ChiroChem hereby agrees to indemnify and hold
CombiChem and its directors, officers, employees and agents (the "Indemnitees")
harmless from and against any and all loss, claims, damages, liabilities joint
and several, expenses, judgments, fines, settlements and other amounts arising
from any and all claims (including reasonable legal expenses and reasonable
attorneys' fees), demands, actions, suits or proceedings (civil, criminal,
administrative or investigative) of any kind, on any theory, in which an
Indemnitee may be involved, as a party or otherwise, as a result of services
rendered by CombiChem under this Agreement, except for liabilities, costs or
expenses resulting from CombiChem's breach of this Agreement or its negligence
or intentional misconduct.

         5. FORCE MAJEURE. No party shall lose any rights hereunder or be liable
to any other party for damages or losses on account of failure of performance by
the defaulting party if the failure is occasioned by an act of God, any
accident, explosion, fire, storm, earthquake, flood, drought, peril of the sea,
riot, embargo, war or foreign, federal, state or municipal order of general
application, seizure, requisition or allocation, any failure or delay of
transportation, shortage of or inability to obtain supplies, equipment, fuel or
labor or any other circumstances or event beyond the reasonable control of the
party relying upon such circumstance or event ("Force Majeure"); provided that
the party claiming Force Majeure has exerted all reasonable efforts to avoid or
remedy such Force Majeure; provided, however, that in no event shall a party be
required to settle any labor dispute or disturbance.

         6. FURTHER ACTIONS. Each party 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
Agreement.

         7. NOTICES. All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered personally or by facsimile
transmission (receipt verified), or upon receipt if mailed by registered or
certified mail (return receipt requested), postage prepaid, or sent by express
courier service (receipt verified), to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice;
provided, that notices of a change of address shall be effective only upon
receipt thereof):



                                       3
<PAGE>   4

         If to ChiroChem, addressed to:         ChiroChem Discovery Services LLC
                                                9050 Camino Santa Fe
                                                San Diego, CA  92121
                                                Attention:  Board of Managers

         With a copy to:                        CombiChem JVR, Inc.
                                                9050 Camino Santa Fe
                                                San Diego, CA  92121
                                                Attention:  President

         And to:                                Chirotech Limited
                                                Cambridge Science Park
                                                Milton Road
                                                Cambridge CB4 4WE
                                                Attn:  Secretary

         And to:                                Brobeck Phleger & Harrison LLP
                                                550 West C Street, Suite 1300
                                                San Diego, CA 92101-3532
                                                Attn:  Faye H. Russell, Esq.

         If to CombiChem, addressed to:         CombiChem, Inc.
                                                9050 Camino Santa Fe
                                                San Diego, CA 92121
                                                Attn:  President

         With a copy to:                        Chirotech Limited
                                                Cambridge Science Park
                                                Milton Road
                                                Cambridge CB4 4WE
                                                Attn:  Secretary

         And to:                                Brobeck Phleger & Harrison LLP
                                                550 West C Street, Suite 1300
                                                San Diego, CA 92101-3532
                                                Attn:  Faye H. Russell, Esq.

         Any copy of a notice shall be sent at the same time as the original
notice.

         8. GOVERNING LAW. The laws of the State of California shall govern the
validity of this Agreement, the construction of its terms, and the
interpretation of the rights and duties arising hereunder.

         9. ARBITRATION. Any controversy between the parties hereto arising out
of or relating to this Agreement, or the breach thereof, shall be settled by
arbitration in San Francisco, California in accordance with the then-applicable
commercial arbitration rules of the American Arbitration Association. Judgment
upon the award rendered may be entered into any court 



                                       4
<PAGE>   5

having jurisdiction thereof. The losing party shall bear the costs and expenses
of such arbitration.

         10. WAIVER. Except as specifically provided for herein, the waiver from
time to time by any of the parties of any of their respective rights or their
respective failure to exercise any remedy shall not operate or be construed as a
continuing waiver of same or of any other of such party's rights or remedies
provided in this Agreement.

         11. SEVERABILITY. If any term, covenant or condition of this Agreement
or the application thereof to any party or circumstance shall, to any extent, be
held to be invalid or unenforceable, then (i) the remainder of this Agreement,
or the application of such term, covenant or condition to parties or
circumstances other than those as to which it is held invalid or unenforceable,
shall not be affected thereby and each term, covenant or condition of this
Agreement shall be valid and be enforced to the fullest extent permitted by law;
and (ii) the parties hereto covenant and agree to renegotiate any such term,
covenant or application thereof in good faith in order to provide a reasonably
acceptable alternative to the term, covenant or condition of this Agreement or
the application thereof that is invalid or unenforceable, it being the intent of
the parties that the basic purposes of this Agreement are to be effectuated.

         12. HEADINGS; AMBIGUITIES. The section and paragraph headings contained
herein are for the purposes of convenience only and are not intended to define
or limit the content of said sections or paragraphs. Ambiguities, if any, in
this Agreement shall not be construed against any party, irrespective of which
party may be deemed to have authorized the ambiguous provision.

         13. NO EFFECT ON OTHER AGREEMENTS. No provision of this Agreement shall
be construed so as to negate, modify or affect in any way the provisions of any
other agreement between the parties unless specifically referred to, and solely
to the extent provided, in any such other agreement.

         14. RELATIONSHIP OF THE PARTIES. Nothing contained in this Agreement is
intended or is to be construed to constitute CombiChem as an employee of
ChiroChem. Except as expressly provided herein, no party hereto shall have any
express or implied right or authority to assume or create any obligations on
behalf of or in the name of another party or to bind the other party to any
contract, agreement or undertaking with any third party.

         15. SUCCESSORS AND ASSIGNS. Except as otherwise provided herein, no
party may assign its rights or obligations under this Agreement to any other
person without the prior written consent of the other parties, provided,
however, that CombiChem may subcontract the performance of any obligations
hereunder, but shall not be relieved from any liability therefor. Subject to the
foregoing any reference to CombiChem and ChiroChem hereunder shall be deemed to
include the successors thereto and assigns hereof.

         16. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original, and all of which counterparts, taken together,
shall constitute one and the same instrument.


                [Remainder of This Page Intentionally Left Blank]



                                       5
<PAGE>   6

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first set forth above.



CHIROCHEM DISCOVERY SERVICES LLC,       COMBICHEM, INC., a Delaware 
a California limited liability          corporation
company                                 

By CHIROTECH LIMITED, a company         By:      /s/  Vicente Anido, Jr.
organized and existing under the             -----------------------------------
laws of England and Wales,              Name:  Vicente Anido, Jr.
Member                                         ---------------------------------
                                        Title: President & CEO
                                               ---------------------------------

By:  /s/  Christine H. Soden
    ---------------------------------
Name:   Christine H. Soden
       ------------------------------
Title:  Director
       ------------------------------

And by COMBICHEM JVR, INC., 
a Delaware corporation,
Member


By:  /s/  Vicente Anido, Jr.
    ---------------------------------
Name:  Vicente Anido, Jr.
       ------------------------------
Title: President & CEO
       ------------------------------






                [SIGNATURE PAGE TO COMBICHEM SERVICES AGREEMENT]


<PAGE>   7

                                   SCHEDULE 1

                               COMBICHEM SERVICES


         Pursuant to the terms and conditions of this Agreement and this
Schedule 1, CombiChem shall provide the following services to ChiroChem:

         TECHNICAL SERVICES. CombiChem shall provide that number of FTEs
approved in the Annual Budget, as amended from time to time, to work for
ChiroChem designing and producing libraries of chiral templates. The cost of
providing such employees *** ***.

         ADMINISTRATIVE AND GENERAL SERVICES. CombiChem shall provide that
number of FTEs approved in the Annual Budget, as amended from time to time, to
provide the accounting services and coordinate audit, legal and general
administrative services to ChiroChem. The cost of providing such FTEs *** ***.

         OTHER SERVICES. The parties currently contemplate that CombiChem shall
be responsible for sales efforts in Japan, through third parties, of ChiroChem
chiral template libraries and that CombiChem shall be responsible for shipping
the chiral template libraries to all ChiroChem customers. The level of these and
any additional services (and payment therefor) shall be as agreed upon by
ChiroChem and CombiChem from time to time.





- ----------

*** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission.

<PAGE>   1


                                                                   EXHIBIT 10.68


                        LEAD GENERATION PROGRAM AGREEMENT

                                     BETWEEN

                                 COMBICHEM, INC.

                                       AND

                          ONO PHARMACEUTICAL CO., INC.

                                DECEMBER 30, 1998















*** Certain confidential portions of this Exhibit were omitted by means of
blackout of the text (the "Mark"). This Exhibit has been filed separately with
the Secretary of the Commission without the Mark pursuant to the Company's
Application Requesting Confidential Treatment under Rule 24b-2 under the Act.


<PAGE>   2

                       LEAD GENERATION PROGRAM AGREEMENT

        THIS LEAD GENERATION PROGRAM AGREEMENT (this "Agreement") is entered
into and made effective as of December 30, 1998 (the "Effective Date"), by and
between COMBICHEM, INC., a Delaware corporation having its principal offices at
9050 Camino Santa Fe, San Diego, California 92121 ("CombiChem") and ONO
PHARMACEUTICAL CO., LTD., a Japanese corporation having its principal offices
located at 1-5 Doshomachi, 2-Chome, Chuo-Ku, Osaka 541-8526 Japan ("ONO").

        WHEREAS, CombiChem has developed, been licensed from a Third Party
and/or owns certain drug discovery technology and intellectual property rights,
including chemical library design software, multi-parallel synthesis and
purification methods, chemical libraries suitable for high throughput biological
screening assays and medicinal chemistry (collectively, the "CombiChem
Technology");

        WHEREAS, as of the Effective Date, ONO and its Affiliates have developed
and own certain drug discovery and intellectual property rights, including
certain assays, methods and know-how regarding the Research Target, among other
things (collectively, the "ONO Technology");

        WHEREAS, CombiChem and ONO have entered into the UIL (as defined herein)
Screening Agreement dated March 31, 1998 (the "Screening Agreement") under which
CombiChem supplied its proprietary UIL to ONO for the screening of targets in
which ONO has an interest for drug discovery. As a result of CombiChem's
analysis of ONO's screening data of the UIL on such targets, the Research Target
was identified as suitable for the initiation of a lead generation program as
set forth in this Agreement; and

        WHEREAS, CombiChem and ONO desire to conduct research under a lead
generation program focusing on such Research Target ("Lead Generation Program"
or "LGP") and ONO desires to develop therapeutic drugs in the Field with
compounds and information which result from such LGP.

        NOW, THEREFORE, the Parties agree as follows:

        1. DEFINITIONS

                1.1 "Active Compound(s)" means a Research Compound (or Research
Compounds) which:

                        (a) is synthesized by CombiChem in connection with the
Lead Generation Program;

                        (b) is selected by the RMC in connection with the Lead
Generation Program based on the criteria for classification of an Active
Compound or Inactive Compound as set forth in the Research Plan; and




<PAGE>   3

                        (c) is covered under claims of any Research Patent.

                1.2 "Affiliate" of a Party means any corporation or other
business entity controlled by, controlling or under common control with, such
Party. For this purpose "control" shall mean direct or indirect beneficial
ownership of more than fifty percent (50%) of the voting securities or income
interest in such corporation or other business, or if not meeting the preceding
requirements, any company owned or controlled by or owning or controlling such
Party at the maximum control or ownership right permitted in the country where
such company exists.

                1.3 "Assigned Hit Compound(s)" means a compound (or compounds)
which:

                        (a) is included in the UIL and is identified from the
screening of the UIL against the Research Target;

                        (b) is confirmed to be satisfactory for the First Year
Benchmarks and the Second Year Benchmarks; and

                        (c) CombiChem affirmatively assigns its property rights
to ONO under the Screening Agreement.

                1.4 "CombiChem Compound" means a chemical compound that is
proprietary to CombiChem, or whose use or manufacture is proprietary to
CombiChem or its Affiliates excluding any and all compounds in which all rights
and intellectual property are assigned to ONO.

                1.5 "CombiChem Technology" has the meaning set forth in the
preamble.

                1.6 "Confidential Information" means all non-public, proprietary
or otherwise confidential information, now owned, licensed or controlled or
hereafter acquired, developed, owned or licensed or controlled by a disclosing
Party prior to or during the term of this Agreement. Confidential Information
shall include, but is not limited to,

                        (a) all information and materials received by either
Party from the other Party pursuant to this Agreement which is confidential
under Article 10 hereof;

                        (b) all information and materials generated by either
Party arising out of the Lead Generation Program during the Research Period; and

                        (c) the terms and conditions of this Agreement.

                1.7 "Cycle" means, following the initiation of the Research
Period, the period of time between CombiChem's taking and starting to process
data received from ONO or CombiChem and ONO's screening of compounds resulting
from CombiChem's processing of such data.





                                      -2-
<PAGE>   4

                1.8 "Derivative" means a compound (or compounds) which:

                        (a) has not been synthesized by CombiChem;

                        (b) has resulted from chemical synthesis by ONO to
generate a Preclinical Lead Compound or a Development Compound after the end of
the Research Period; and

                        (c) is covered under claims of any Research Patent.

                1.9 "Development Compound(s)" means a compound (or compounds)
which:

                        (a) (i) is an Active Compound or (ii) is a Derivative or
an Improved Derivative;

                        (b) is designated by ONO to be appropriate for
preclinical studies for the purpose of IND (as defined herein) filing by ONO;
and

                        (c) is intended by ONO to be developed or commercialized
for use within the Field.

                1.10 "Due Diligence" means the use of by a Party of its
resources for the purposes of this Agreement in a manner which is consistent
with the exercise of reasonable and prudent scientific and business judgment as
applied to other programs of ONO or CombiChem, as the case may be, as more fully
set forth in the Research Plan.

               1.11 "Exclusivity Period" means the Research Period *** , as may
be extended or reduced pursuant to Article 3 hereof.

               1.12 "Field" means all therapeutic indications in humans for the
Research Target against which a Development Compound or Products may be
directed.

               1.13 "First Commercial Sale" of a Product means the first sale
for use or consumption of such Product in a country after required marketing and
pricing approval has been granted by the governing health regulatory authority
of such country. Sale to an Affiliate shall not constitute a First Commercial
Sale unless the Affiliate is the end user of the Product.

               1.14 "First Year Benchmark" shall have the meaning set forth in
Schedule A attached hereto.

               1.15 "FTE" means a full-time equivalent employee of CombiChem
having the requisite skills to fulfill CombiChem's obligations under this
Agreement. For purposes of this Agreement, the FTEs shall include synthetic and
analytical chemists, compound control scientists and computational scientists.


- ----------

        *** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission



                                      -3-
<PAGE>   5

                1.16 "Improved Derivative" means a Derivative (or Derivatives)
which is included in the claims of a Selection Patent. No compound (or
compounds) proposed by CombiChem for synthesis by CombiChem during the Research
Period, and subsequently rejected by the RMC, shall be an Improved Derivative
under this Agreement, and if such is later pursued by ONO with respect to the
Research Target, such shall be treated as a Derivative under this Agreement.

                        ONO shall use commercially reasonable efforts to
demonstrate that a compound is an Improved Derivative to CombiChem's reasonable
satisfaction prior to any milestone or royalty *** pursuant to Sections 8.3 or
8.4 hereof.

                1.17 "Inactive Compound(s)" means a Research Compound (or
Research Compounds) which:

                        (a) is synthesized by CombiChem in connection with the
Lead Generation Program but is not selected as an Active Compound by the RMC;
and

                        (b) is not covered under the claims of any *** .

                1.18 "IND" means an Investigational New Drug notification or
equivalent application filed with the governing health regulatory authority in
the United States or any foreign equivalent in any country in the Territory.

                1.19 "Lead Generation Program" or "LGP" means the research
activities generically described in the preamble and to be conducted in
accordance with the Research Plan and provisions set forth in Sections 2.1 and
2.2 of this Agreement during the Research Period.

                1.20 "NDA" means a New Drug Application or equivalent filed with
the governing health regulatory authority in the United States or any foreign
equivalent in any country in the Territory.

                1.21 Net Sales" means, with respect to any Product, the invoiced
sales price of such Product billed by ONO, its licensees or its assignees to
independent customers (other than sales to Affiliates of ONO, unless such
Affiliate is the end user), less to the extent included in the invoiced sales
price, (a) actual credits, allowances, discounts and rebates to, and chargebacks
from the account of, such independent customers (b) any actual deductions for
spoiled, damaged, out-dated, and returned but not replaced Product; (c) actual
contributions made by ONO to the Japanese Fund for Sufferers for Adverse Drug
Events, but not to exceed 1% of what would be Net Sales without giving effect to
this subsection (c); (d) actual freight and insurance costs incurred in
transporting such Product in final form to such customers; (e) actual cash,
quantity and trade discounts and other price reduction programs; (f) actual
sales, use, value-added and other direct taxes incurred; and (g) actual customs
duties, surcharges and other governmental charges incurred in connection with
the exportation or importation of such Product in final form.



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                1.22 "ONO Compound" means any and all compounds covered under
the claims of a Research Patent including, but not limited to, any Assigned Hit
Compound, Active Compound, Derivative, Improved Derivative, Preclinical Lead
Compound and/or Development Compound.

                1.23 "ONO Technology" shall have the meaning set forth in the
preamble of this Agreement.

                1.24 "Party" means CombiChem or ONO, as the case may be,
including their respective Affiliates, permitted successors and assigns.

                1.25 "Patent" means (a) valid and enforceable U.S. or non-U.S.
Patent, and any non-U.S. equivalent, including any extension (including
Supplemental Protection Certificates), registration, confirmation, reissue,
continuation, divisionals, continuation-in-part, reexamination or renewal
thereof, or (b) pending applications for any of the foregoing, whether filed or
issued before or after the Effective Date.

                1.26 "Preclinical Lead Compound" means an Active Compound (or
Active Compounds), a Derivative (or Derivatives) or an Improved Derivative (or
Improved Derivatives) which satisfies the Second Year Benchmarks as set forth in
Schedule A attached hereto.

                1.27 "Product(s)" means any product containing a Development
Compound as the active ingredient or one of the active ingredients and which is
granted regulatory approval by the governing health regulatory authority of the
applicable country for marketing in the Field.

                1.28 "Research Compound(s)" means a compound (or compounds)
which (a) is synthesized following the Effective Date by CombiChem and provided
a sample of such to ONO for screening against the Research Target under the Lead
Generation Program, (b) is a pre-existing or hereafter acquired CombiChem
Compound which CombiChem desires to designate as a Research Compound, (c) is a
pre-existing or hereafter acquired chemical compound that is proprietary to ONO,
or whose use or manufacture is proprietary to ONO or its Affiliates, which ONO
desires to designate as a Research Compound or (d) is *** .

                1.29 "Research Libraries" means any and all compounds
(including, but not limited to, the Research Compounds) included in libraries
which are designed and synthesized for ONO by CombiChem following the Effective
Date as part of the Lead Generation Program.

                1.30 "Research Management Committee" or "RMC" has the meaning
set forth in Article 5 below.

                1.31 "Research Patent" means a Patent with composition of matter
claims and/or treating method claims relating to the Research Target which is
filed, maintained and/or prosecuted by ONO based on ONO's rights and
intellectual property assigned to ONO pursuant 


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to Section 4.2 hereof and which covers the results arising out of the Lead
Generation Program during the Research Period.

                1.32 "Research Period" means that part of the Lead Generation
Program commencing on the Effective Date, and ending *** thereafter, unless
earlier terminated, and which can be extended in accordance with Article 6 or
Section 8.5(a) hereof.

                1.33 "Research Plan" means the research plan to be agreed in
writing between the Parties and to be attached hereto as Schedule D, which
describes in mutually agreed upon detail the research activities to be performed
during the Research Period for the Research Target.

                1.34 "Research Target" means *** .

                1.35 "Returned Compounds" shall have the meaning set forth in
Section 7.3.

                1.36 "Royalty Term" means, in the case of any Product, in any
country, the period of time commencing on the First Commercial Sale and ending
*** from the date of First Commercial Sale in such country.

                1.37 "Second Year Benchmark" shall have the meaning set forth in
Schedule A attached hereto.

                1.38 "Selection Patent" means a Patent with claims covering a
compound (or compounds) which (i) is filed, maintained and/or prosecuted by ONO,
(ii) is included in a prior Research Patent but not specifically disclosed
therein and (iii) has superior effect which is unexpected from a prior Research
Patent.

                1.39 "Target Exclusivity Obligations" shall have that meaning
set forth in Section 3.1 hereof.

                1.40 "Territory" means the entire world.

                1.41 "Third Party" means an entity other than CombiChem or ONO
or their respective Affiliates, or permitted successors or assigns.

                1.42 "UIL" means CombiChem's proprietary Universal Informer
Library(TM).


        2. RESEARCH ACTIVITY

                2.1 CombiChem Responsibilities. CombiChem shall, with Due
Diligence, provide the following resources to ONO and conduct the following
activities under the Lead Generation Program, as more fully described in the
Research Plan:



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                        (a) Prior to the Effective Date, (i) CombiChem has
reviewed data and information regarding the Research Target provided by ONO and
derived from the UIL by CombiChem and (ii) both Parties have agreed upon the
Research Plan under the Screening Agreement. During the Research Period, based
on the data and information described above and such additional data and
information as may be provided by ONO after the Effective Date and using the
CombiChem Technology, CombiChem shall design Research Libraries as a part of the
LGP and supply all lead chemestries and synthesize Research Compounds as
provided in Section 4.4 hereof. CombiChem shall make commercially reasonable
efforts to identify Research Compounds which satisfy the First Year Benchmarks
on or before the first anniversary of the commencement of the Research Period
and to identify Preclinical Lead Compounds on or before the expiration of the
Research Period.

                        (b) During the Research Period, CombiChem shall keep ONO
informed of its activities performed in connection with the Lead Generation
Program, including, without limitation, providing ONO with data and information
(and, upon ONO's request, reasonable quantities of samples pursuant to Section
4.4 hereof) regarding the status of all Research Compounds prior to the meetings
of the RMC. CombiChem shall also establish a method of synthesis as provided in
Section 4.5 hereof.

                        (c) Subject to Section 2.3 and 8.2 hereof and Article 3
hereof, CombiChem shall provide one (1) project team ("Project Team") to conduct
CombiChem's activities in connection with the Lead Generation Program at a per
annum rate of *** *** to be paid by ONO pursuant to subsections 8.2 (a), (b) and
(c) hereof. The initial Project Team shall consist of a minimum of *** CombiChem
FTEs, unless both Parties determine otherwise pursuant to subsection 8.2(c)
hereof.

                        (d) CombiChem shall maintain research records in
reasonably sufficient detail comparable to the way they are maintained for
CombiChem's own research programs and in good scientific manner appropriate for
ONO's Patent purposes, which shall reflect all work done and results achieved in
accordance with the LGP. Upon ONO's request, CombiChem shall provide ONO with
copies of all such records.

                2.2 ONO Responsibilities. ONO shall, with Due Diligence, provide
the following resources to CombiChem and conduct the following activities under
the Lead Generation Program, as more fully described in the Research Plan:

                        (a) During the Research Period, ONO shall make payment
to CombiChem for the Lead Generation Program as set forth in Sections 8.1 and
8.2 hereof and shall provide screening, biological and structural data and
information to CombiChem necessary for CombiChem to perform its duties under
this Agreement. ONO will further assume scientific, financial and administrative
responsibility for screening and biological support activities, drug 



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development and regulatory filings during and after the term of the Lead
Generation Program on the terms set forth below.

                        (b) During the Research Period, ONO shall screen
Research Compounds for in vitro activity and, where appropriate, in vivo
activity against the Research Target. ONO shall provide CombiChem with data and
information which ONO develops pursuant to subsections 2.2(a) and (b) regarding
Research Compounds under the Lead Generation Program prior to the meetings of
the RMC.

                        (c) Following the Research Period, ONO shall select the
Development Compound from the Preclinical Lead Compounds, and if so selected,
ONO shall make reasonable commercial efforts to conduct preclinical and clinical
studies of the Development Compound for the purpose of filing an NDA and
thereafter to progress Products through to the marketplace as expeditiously as
possible. The Parties understand that there are inevitable delays in the
development process which lie outside ONO's direct accountability.

                        (d) Notwithstanding the provisions of subsection 2.2(c)
above, in the event that ONO reasonably determined that the Preclinical Lead
Compounds are not satisfactory for development and commercialization, following
the Research Period ONO may conduct chemistry work to generate and synthesize
the Derivatives and screen such Derivatives for in vitro and in vivo activities
against the Research Target only after ONO has thoroughly reviewed and conducted
biological testing on all Research Compounds synthesized by CombiChem and
provided to ONO. ONO will assume scientific, financial and administrative
responsibility for the medicinal chemistry, screening and biological support
activities.

                        (e) Following the Research Period through First
Commercial Sale, ONO shall use commercially reasonable efforts to prepare and
provide CombiChem with each of the reports related to ONO's activities under
this Agreement as specified in Schedule C attached hereto.

                        (f) During the Research Period and providing that ONO is
not in arrears on any payment specified in Sections 8.1, 8.2 and 8.3 hereof, ONO
shall, at its option, send one (1) research chemist to conduct ONO' activities
at CombiChem's facilities under the Lead Generation Program. ONO shall have sole
responsibility for the expenses associated with its visiting chemists,
including, without limitation, salary, travel, living and other associated
expenses of such chemist.

                2.3 Conduct of Lead Generation Program. The Parties hereby agree
that the Lead Generation Program shall be carried out with Due Diligence in
accordance with the Research Plan and this Agreement, as each may be amended
from time to time. The RMC shall review the Research Plan on a regular and
ongoing basis and may make written changes to the Research Plan so long as such
changes are mutually agreed to in writing by CombiChem and ONO.

                2.4 Third Party Licenses. Each Party shall be solely responsible
for acquiring any Third Party license and its associated fees required to
perform its obligations under this Agreement.




                                      -8-
<PAGE>   10

        3. EXCLUSIVITY

                3.1 Research Target Exclusivity. Following the Effective Date,
so long as ONO or its Affiliates are proceeding with Due Diligence for the
Research Target, CombiChem shall not work on, or provide services, or advise,
either independently, or with any Third Parties (except where CombiChem is
providing its UIL to Third Parties without knowledge of such Third Parties'
target) with respect to the Research Target (the "Target Exclusivity
Obligations"), except (a) with respect to any Third Parties who are
collaborators or proposed collaborators of CombiChem, CombiChem shall have the
right, consistent with its corporate policy (but without identifying any
Research Target), to notify any such Third Party of its decision not to work on
and/or inability to work on such Research Target with that Third Party or (b)
ONO has provided CombiChem with a notice and release of Target Exclusivity
Obligations.

                3.2 Compound *** . Any Active Compound, Derivative or Improved
Derivative shall be *** available to ONO for research or application within or
outside the Lead Generation Program, during the Exclusivity Period, and
CombiChem shall not work on or provide information regarding such Active
Compound, Derivative or Improved Derivative to any Third Party, except to take
any steps necessary to protect ONO's exclusivity hereunder. Following the
expiration of the Research Period, Active Compounds, Derivatives or Improved
Derivatives for which a Research Patent has not been filed by the end of the
Exclusivity Period shall be deemed to be Inactive Compounds for all purposes
hereunder; provided, that any such Inactive Compound which is the subject of
claim(s) under a pending Research Patent shall continue to be *** available to
ONO until a Research Patent is issued with respect to one or more of such claims
or until all of such Research Patent claims have been denied and all appeals and
refiling procedures have been exhausted, at which time the compounds which are
the subject of those claims shall be Inactive Compounds hereunder.  

                3.3 Inactive Compounds.

                        (a) Except as otherwise provided in this Section 3.3,
any Inactive Compounds shall be available to CombiChem and ONO for any purpose.

                        (b) Research Compounds that are classified by the RMC as
an Inactive Compound during the *** in the Lead Generation Program or any
subsequent Cycle in the Lead Generation Program thereafter (each, a " *** "),
shall be exclusively available to ONO for research or application within or
outside the Lead Generation Program from the time of classification as an
Inactive Compound until the end of the Exclusivity Period. At the end of the
Exclusivity Period for any *** , if ONO has filed a *** with claims covering
such *** , such *** shall be treated as an Active Compound and shall continue to
be exclusively available to ONO as provided herein. If, however, ONO has not
filed a Research Patent with claims covering such *** by 




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the end of the Exclusivity Period for such *** , such *** shall thereafter
become available to CombiChem and ONO for research or application for any
purpose. With respect to each *** , during the Exclusivity Period, CombiChem
shall not work on or provide information regarding such *** to any Third Party,
except to take any steps necessary to protect ONO's exclusivity hereunder.

                        (c) Each Party shall promptly notify the other Party of
the filing of a Patent or Research Patent with claims covering an Inactive
Compound.


        4. COLLABORATION COMPOUNDS

                4.1 Pre-Existing Compounds or Other Pre-Existing Rights. Neither
Party shall have any rights with respect to any pre-existing compound of the
other Party unless and until such compound is designated as a Research Compound
by such other Party. Additionally, CombiChem may decline (after informing ONO)
to synthesize a particular compound or library of compounds by written notice to
ONO of existing Patents and/or contractual obligations with Third Parties
restricting CombiChem's performance of such activities.

                4.2 Intellectual Property Rights; License to ONO. Subject to
Section 7.3 hereof, and except as set forth in this Section 4.2, the ownership
rights in all Research Patents and intellectual property (whether or not
patentable) (including the right to file the Patent) relating to ONO Compound(s)
and the subject matter contained therein and resulting from the Lead Generation
Program shall be solely vested in ONO. Such ownership rights shall be achieved
by CombiChem assigning its right, title and interest in such Research Patents
and intellectual property relating to such ONO Compounds to ONO on (i)in the
case of Active Compounds, the date of the approved determination by the RMC that
a Research Compound is an Active Compound, (ii) in the case of Derivatives or
Improved Derivatives, upon notification by ONO to CombiChem of the synthesis by
ONO of such Derivative or Improved Derivative or (iii) in the case of any ONO
Compounds other than Active Compounds, Derivatives or Improved Derivatives, when
a Research Patent is filed by ONO and where such assignment is not possible, ONO
shall receive a worldwide, exclusive license under CombiChem's rights, with a
right to sublicense for all purposes *** to CombiChem other than those proposed
in Article 8. ONO shall be responsible for filing, maintaining and prosecuting
all Research Patents at its sole expense in those countries set forth on
Schedule E (individually, a "Major Country", and collectively, "Major
Countries") and CombiChem shall use commercially reasonable efforts to assist
ONO in filing such Research Patent; provided under no circumstances does
CombiChem warrant to ONO that its rights in any ONO Compounds are exclusive to
the extent such ONO Compounds may be covered under the patent claims of Third
Parties wherein such claims are not the direct result of a collaboration between
the Third Party and CombiChem. If ONO fails to so file, maintain or prosecute
all Research Patents in any Major Country, 


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CombiChem shall have the right to request ONO to do so. If ONO elects not to
file, maintain or prosecute all Research Patents in any Major Country ONO shall
promptly notify CombiChem of such election and provide CombiChem with a
fully-paid up license so that CombiChem can take over such filing, maintenance
or prosecution of those Research Patents for which ONO has elected not to file,
maintain or prosecute in such Major Country, at CombiChem's sole expense.

                4.3 Structural Information. Neither Party shall disclose the
structure of the other Party's compound, any Active Compound, Derivative,
Improved Derivative and Late Stage Inactive Compound to any Third Party without
the other Party's written permission, unless required to do so by law, in which
case such Party shall promptly notify the other Party of such required
disclosure; provided, however, that ONO is entitled to file a Research Patent at
its sole discretion and to disclose the structure of compounds covered by such
Research Patent to any Third Party following filing of such Research Patent.

                4.4 Supply of Research Compounds. Aliquots of any Research
Compound that has been synthesized will be prepared and given to ONO for in
vitro screening under the Research Plan. CombiChem shall replenish any amounts
provided to ONO as set forth in the Research Plan upon ONO's reasonable request.
CombiChem shall maintain aliquots of any Research Compound that has been
synthesized by CombiChem under the Research Plan. With respect to any Research
Compound which ONO intends to test in vivo under the Research Plan, CombiChem
shall also provide ONO with additional requirements of samples requested by ONO
at CombiChem's expense. To the extent the Research Compounds are not available
in a timely and sufficient quantity to allow the earliest start of necessary
large scale preclinical or other studies such unavailability of Research
Compounds shall not be cited as a lack of Due Diligence provided that CombiChem
has made commercially reasonable attempts, and continue such attempts, to
provide such unavailable Research Compounds in required quantities in the most
expedient manner.

                4.5 Method of Synthesis. In order to assist ONO in synthesizing
and manufacturing Preclinical Lead Compounds for clinical and commercial supply,
CombiChem shall use reasonable efforts to establish, and to provide any
reasonable information related to, a method of synthesis for Preclinical Lead
Compounds selected by ONO.


        5. RESEARCH MANAGEMENT COMMITTEE

                There shall be established a Research Management Committee (the
"RMC") comprised of four (4) core representatives, two (2) of whom shall be
chosen from time to time by ONO and two (2) of whom shall be chosen from time to
time by CombiChem to discuss between the Parties the progress, direction and/or
modification of the Research Plan, or determine whether a Research Compound is
an Active Compound or Inactive Compound. RMC meetings shall (i) be convened in
person once each quarter during the Research Period, or as otherwise reasonably
requested by either Party, (ii) take place alternating between San Diego or
Osaka, (iii) be chaired by a representative of a Party hosting the meeting and
(iv) be participated in by the members of the RMC, provided, however, that each
Party may have such other of its employees and consultants participate in the
meeting as may be required to adequately address the specific topics of the
meeting. The agenda of the meeting shall be coordinated between the Parties and




                                      -11-
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established at least two (2) weeks prior to the meeting. In the event that a
Party wishes to present to the other Party its data and information relating to
the LGP, such Party shall furnish the other with such data and information to
the extent available, at least two (2) weeks prior to the meeting. A draft of
the meeting minutes reflecting matters addressed at such meeting shall be
prepared by the Party hosting the meeting and provided to the other for its
review and comment. Such minutes shall be considered accurate only upon signing
by representatives of both Parties. The Parties acknowledge that the RMC is not
authorized to amend or alter the terms of this Agreement; however, the RMC may
make appropriate scientific changes to the Research Plan and determination of
Active Compound or Inactive Compound which shall only be authorized by minutes
of the meeting executed by both Parties or any other written form. A Party may
authorize alternate members to act in the place of members of the RMC due to
their absence or other unavailability.


        6. RESEARCH PERIOD

                The initial term of the Lead Generation Program shall commence
on the Effective Date and conclude at the end of the Research Period, subject to
extension upon mutual agreement. To extend the Research Period, either Party
must notify the other Party no later than ninety (90) days prior to the
then-current expiration date and the Parties shall negotiate in good faith the
terms and conditions of any such extension based on a per annum rate of ***
***. Notwithstanding the foregoing, in the event that ONO requests CombiChem to
maintain FTEs pursuant to Section 8.5(a) of this Agreement, the Research Period
shall automatically be extended for an additional three (3)-month period on the
terms set forth in Section 8.5(a).


        7. LICENSE GRANTS; SUBLICENSE

                7.1 CombiChem License Grant to ONO. Subject to the terms and
conditions hereof, CombiChem hereby grants to ONO an exclusive, royalty bearing
(as set forth in Section 8.4 of this Agreement), worldwide license, with the
right to sublicense to use such CombiChem Technology as is necessary to make,
have made, use, have used, sell, have sold, import and export ONO Compounds
and/or Products in the Territory.

                7.2 ONO License. ONO shall have the right to transfer, assign or
license and sublicense to a Third Party ONO Compounds and/or the Products or
associated rights under the Research Patents covering ONO Compounds and/or the
Products, subject to CombiChem's right to receive all royalties and milestone
payments as provided in Sections 8.3, 8.4 and 8.5 hereof.

                7.3 ONO *** to CombiChem. Following the decision of ONO or its
licensee not to develop and commercialize nor to seek a Third Party to license
for commercialization in the Territory with Due Diligence any and all ONO
Compounds and/or 


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Products (collectively, "Returned Compounds"), ONO shall *** to CombiChem a ***
*** , under the Research Patents and know-how which result from the Lead
Generation Program and related exclusively to the Returned Compounds, to make,
have made, use, have used, sell, have sold, import and export such Returned
Compounds in the Territory. Prior to the *** under this Section 7.3 to
CombiChem, ONO and CombiChem shall negotiate in good faith the terms and
conditions of such *** regarding any Returned Compound.

                7.4 Rights to Inactive Compounds. Except as otherwise provided
in Section 3.3 hereof with respect to *** , each Party shall be free to screen
Inactive Compounds against any target other than a Research Target. In the event
that either ONO or CombiChem shall develop, market and/or sell, or enter into a
binding agreement with a Third Party to develop, market and/or sell, any product
containing the Inactive Compound as an active ingredient, then except to the
extent that such Inactive Compound is subject to a valid claim in a Patent owned
or controlled by the other Party, the other Party hereto shall not be entitled
to any payments, milestones, royalties, fees or compensation of any kind.

        8. CONSIDERATION

                8.1 Initiation Fee. As of the Effective Date, ONO shall be
obligated to pay CombiChem a non-refundable, noncontingent project initiation
fee of *** , by registered check or wire transfer, to initiate the Lead
Generation Program for the Research Target within thirty (30) days of the
Effective Date.

                8.2 Lead Generation Program Funding.

                        (a) First Year Research Support. Subject to subsection
8.2(c) below and Sections 9.2 and 9.3 hereof, as of the Effective Date, ONO
shall be obligated to pay CombiChem a non-refundable, non-contingent fee in
support of CombiChem's research activities to be conducted pursuant to this
Agreement during the first year of the Lead Generation Program on the Research
Target of *** by registered check or wire transfer within thirty (30) days of
the Effective Date.

                        (b) Second Year Research Support. ONO shall pay to
CombiChem on or before thirty (30) days prior to the first anniversary of the
execution of this Agreement (the "First Anniversary"), *** which is equal to the
fee necessary to support CombiChem's research activities to be conducted
pursuant to this Agreement during the initial three (3)-month period of the
second year of this Agreement . If ONO terminates this Agreement by delivering
written notice to CombiChem within two (2) months following the First
Anniversary pursuant to Section 9.3 hereof, *** *** during the second year of
this Agreement calculated on a 




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*** basis: i.e., in case ONO delivers such notice of termination within one (1)
month following the First Anniversary, *** shall be the amount equal to ***
*** and shall be made to ONO within fifteen (15) business days after CombiChem's
receipt of such notice, or is delivered within two (2) months after the First
Anniversary, *** shall be the amount equal to *** *** and shall be made to ONO
within fifteen (15) business days after CombiChem's receipt of such notice. If
ONO notifies CombiChem of its desire to continue this Agreement or fails to
notify CombiChem of its termination of this Agreement within two (2) months
following the First Anniversary, then *** of the second year research support
shall be due on or before the end of three (3) months following the First
Anniversary.

                        (c) Expansion or Contraction of Project Team.
Notwithstanding subsection 2.1(c) hereof, either Party may request that
CombiChem expand or contract its Project Team during the Research Period in
order to properly regulate the work-flow on the Research Target. In such event,
subject to the mutual agreement of both Parties, the RMC shall promptly confer
as to the appropriate number of FTEs to be added to or eliminated from the
Project Team. The current annual research support payments set forth in
subsections 8.2(a) and (b) above assume *** in both years at an annual cost to
ONO of *** .

                                (i) If the Project Team is expanded in the first
year of the Research Period, then within thirty (30) days of such expansion, ONO
shall pay to CombiChem a payment (for each additional FTE) equal to *** times a
fraction with the numerator equal to the number of days in the period of
addition of such FTE to the Project Team (which is agreed to by the RMC) and the
denominator equal to 365.

                                (ii) If the Project Team is expanded in the
second year of the Research Period (or if an expansion which occurred in the
first year of the Research Period continues into the second year of the Research
Period), then within thirty (30) days of such expansion (or if the expansion
occurred in the first year, within thirty (30) days of the First Anniversary),
ONO shall pay to CombiChem a payment (for each additional FTE) equal to ***
times a fraction with the numerator equal to the number of days in the period of
addition of such FTE to the Project Team and the denominator equal to 365.

                                (iii) If an FTE is eliminated from the Project
Team in the first year of the Research Period, then within thirty (30) days of
such elimination, CombiChem shall pay to ONO a payment (for each eliminated FTE)
equal to *** times a fraction with the numerator equal to the number of days in
the period of elimination of such FTE from the Project Team and the denominator
equal to 365.

                                (iv) If an FTE is eliminated from the Project
Team in the second year of the Research Period (or if an elimination which
occurred in the first year of the Research Period continues into the second year
of the Research Period), then within thirty (30) 




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days of such elimination (or if the elimination occurred in the first year,
within thirty (30) days of the First Anniversary), CombiChem shall pay to ONO a
payment (for each eliminated FTE) equal to *** times a fraction with the
numerator equal to the number of days in the period of elimination of such FTE
from the Project Team and the denominator equal to 365.

                        (d) During the Research Period, within forty-five (45)
days following the end of each six (6) month period (or the early termination),
CombiChem shall provide ONO with a *** *** . The amount of the *** shall not
effect ONO's obligation to make any payments set forth in this Article 8 or the
timing of such payments.

                8.3 Milestone Payments.

                        (a) Within thirty (30) days of the occurrence of a
milestone triggered by the activities of ONO or its Affiliates as shown on
Schedule B attached hereto, ONO shall pay CombiChem the related milestone
payment in U.S. dollars as set forth on Schedule B attached hereto by registered
check or wire transfer, provided, however, that in the event that the
characteristics of a Development Compound or Product that ONO intends to
develop, or is developing, for commercialization requires the review of
commercial value of such Development Compound and Product, then the Parties
shall *** of the *** . Each of such payments shall be a *** or Product (except
for payments with respect to *** where the payments shall be made for each
Product as provided in Schedule B attached hereto) for use within the Field. ONO
shall have no obligation to make any milestone payment pursuant to this
Agreement in the event that ONO develops and commercializes an ONO Compound ***
 .

                        (b) In the circumstance where ONO has milestone payment
obligations to CombiChem pursuant to subsection 8.3(a) above with respect to a
Product whose primary active ingredient is an *** that was *** and before the
end of the Exclusivity Period, *** with respect to such Product shall be *** .
For each *** which has elapsed from the end of the Research Period to the *** ,
the milestone payment will be *** by *** and reaching a *** at the end of the
twelfth month following the *** . By way of example, if the *** in the *** after
the end of the *** , each *** would be *** *** .

                        (c) In the circumstances where ONO has milestone payment
obligations to CombiChem pursuant to subsection 8.3(a) above with respect to a
Product whose primary active ingredient is an *** by ONO *** *** with respect to
such Product shall be *** .


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                                      -15-
<PAGE>   17

                8.4 Royalties.

                        (a) During the Royalty Term, ONO will pay CombiChem an
earned royalty of *** of Net Sales of Products for use within the Field. Each
payment of royalties shall be accompanied by a report of Net Sales of Products
in sufficient detail to permit confirmation of the accuracy of the royalty
payment made. ONO shall have no obligation to make any royalty payment pursuant
to this Agreement in the event that ONO develops and commercializes an ONO
Compound outside of the Field.

                        (b) In the circumstance where ONO has royalty
obligations to CombiChem pursuant to subsection 8.4(a) above with respect to a
Product whose primary active ingredient is an *** and before the end of the
Exclusivity Period, such royalty obligations with respect to such Product ***.
For each *** which has elapsed from the *** to the ***, the *** and reaching a
*** at the end of the twelfth month following the *** . By way of example, if
the *** in the *** after the *** ***, the *** would be *** to *** of such
Products.

                        (c) In the circumstances where ONO has royalty
obligations to CombiChem pursuant to subsection 8.4(a) above with respect to a
Product whose primary active ingredient is an *** by ONO after the end of the
*** , such royalty obligations shall be *** of Net Sales of such Products.

                8.5 *** of the Second Year Benchmarks.

                        (a) *** in its reasonable judgment that the Second Year
Benchmarks are not met by the second anniversary of this Agreement ("Second
Anniversary"), upon the request of ONO on or prior to the Second Anniversary,
CombiChem *** *** as of the Second Anniversary for a period of *** following the
Second Anniversary at *** and shall continue to conduct the research activities
pursuant to Section 2.1 hereof. If the Second Year Benchmarks are met on or
before such *** period ends, CombiChem shall be eligible for the Second Year
Benchmark *** under subsection 8.3(a) hereof as if such *** as if the Second
Anniversary.

                        (b) If ONO determines in its reasonable judgment that
the Second Year Benchmarks are not met by the Second Anniversary due solely to
delay *** of its research activities in each Cycle as set forth in the Research
Plan, and *** *** after the end of the Research Period, for each *** from the
end of the Research Period to the synthesis of the Derivative or Improved
Derivative, *** during the  *** 


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                                      -16-
<PAGE>   18


and *** pursuant to Sections *** and reaching a *** at the end of the twelve
(12) month period following the *** , whether the Product contains a Derivative
or an Improved Derivative; provided however, if ONO finally determines to
develop an Active Compound as a Development Compound, *** .

                        (c) *** shall have no obligation *** in the event that
*** has caused *** which has a material adverse affect on CombiChem's ability to
achieve the Second Year Benchmarks.

                8.6 *** of the Second Year Benchmarks. In the event that
CombiChem synthesizes an Active Compound within or before the *** *** which
meets the Second Year Benchmarks, ONO shall pay to CombiChem an *** within
fifteen (15) business days of ONO's confirmation of such achievement in addition
to the milestone payment payable upon the achievement of the Second Year
Benchmarks set forth in Schedule B attached hereto.

                8.7 *** . Notwithstanding the provisions of Sections 8.3(b),
8.3(c), 8.4 (b), 8.4 (c) and 8.5(b), under no circumstances shall the ***
*** provided in such sections *** *** provided in this Agreement.

                8.8 Manner and Place of Payment. Royalty payments and reports
for Net Sales of Products shall be calculated in local currencies and reported
for each calendar quarter. All royalty payments owed under this Agreement shall
be made by wire transfer to the bank account to be designated by CombiChem
within sixty (60) days following the end of each such calendar quarter in case
of Products sold by ONO or its Affiliates and within ninety (90) days following
the end of each such calendar quarter in the case of Products sold by its
licenses or sublicensees. The amount of such sales in foreign currencies shall
be converted into United States dollars at the exchange rate in effect on the
last business day for each calendar quarter as reported in The Wall Street
Journal. However, CombiChem acknowledges that ONO's fiscal term is on a
semi-annual basis and any royalty payments for the Net Sales of the second or
fourth calendar quarters are tentative and shall be calculated based on the
conditions used for the previous quarter. If any overpayment or underpayment is
identified in the calculation of the royalty using the conditions of such
current term at the end of ONO's official semi-annual term (the first and third
calendar quarter), then such overpayment or underpayment shall be deducted or
added to the royalty payments of the first or third calendar quarter, as the
case may be.

                8.9 Target Substitution. In the event that ONO and CombiChem
mutually agree in writing that the Research Target is unsuitable for further
research, the Parties shall meet to discuss the substitution of another Target.
If the Parties mutually agree in writing to such a 


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                                      -17-
<PAGE>   19

Target, ONO shall not be obligated to pay a second project initiation fee to
CombiChem as provided in Section 8.1 hereof.

                8.10 Records and Audit. ONO shall keep complete and accurate
records pertaining to the sale or other disposition of Products in sufficient
detail for a period of three (3) years following each royalty payment to permit
CombiChem to confirm the accuracy of all payments due hereunder. CombiChem shall
have the right to cause an independent certified public accounting firm
reasonably acceptable to ONO to audit such records to confirm ONO's Net Sales
for the preceding year. Any information obtained during such audit shall be
treated as Confidential Information. Such audits may be exercised after
reasonable notice during normal business hours of ONO no more than once each
year. CombiChem shall bear the full cost of such audit unless such audit
discloses a deficiency of the greater of *** or more than *** from the amount of
the Net Sales reported by ONO for such audited period. In such case, ONO shall
bear the reasonable cost of such audit.

                8.11 Taxes. All income and other taxes levied on account of the
royalties and other payments accruing to CombiChem under this Agreement shall be
paid by CombiChem, including taxes levied thereon as income to CombiChem. If
provision is made in law or regulation for withholding, such tax shall be
deducted from the royalty or other payment made by ONO to the proper taxing
authority and a receipt of payment of the tax secured and promptly delivered to
CombiChem. Each Party agrees to assist the other Party reasonably in claiming
exemption from such deductions or withholdings under any double taxation or
similar agreement or treaty from time to time in force.


        9. TERM AND TERMINATION OF THE AGREEMENT

                9.1 Term. The term of this Agreement shall commence upon the
Effective Date and unless earlier terminated as provided in this Agreement,
shall expire at the end of the Research Period.

                9.2 Termination by ONO or CombiChem Due to Breach. If either
Party materially breaches this Agreement and fails to remedy that breach within
ninety (90) days of receiving written notice thereof from the other Party, or
enters into any arrangement of compromise with its creditors or goes into
liquidation, insolvency, bankruptcy, receivership or reorganization proceedings,
whether voluntarily or compulsorily which is not dismissed by a court of
competent jurisdiction within ninety (90) days, then the other Party may at any
time, by notice in writing or by facsimile transmission, terminate this
Agreement. If ONO terminates this Agreement during the Research Period due to
CombiChem's material breach, CombiChem shall repay to ONO within fifteen (15)
business days following such termination any unused portion of ONO's research
support payment which has been paid pursuant to Section 8.2 hereof calculated on
a monthly basis. Within ninety (90) days following termination for any Lead
Generation Program and/or research related to the Research Target under this
Agreement, the 



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                                      -18-
<PAGE>   20

RMC shall prepare a detailed, final written report to each Party, and provide
any remaining supply of compounds in synthesis to date, for the Research Target
or Lead Generation Program being terminated.

                9.3 Other Termination by ONO or CombiChem.

                        (a) In the event that ONO reasonably determines that
CombiChem has failed to achieve the "First Year Benchmarks" during the initial
twelve (12) months of the Research Period, ONO shall be entitled to immediately
terminate this Agreement by delivering written notice of such termination to
CombiChem within two (2) months after the First Anniversary and ONO shall not be
required to make any further payments thereafter.

                        (b) This Agreement shall be terminable by either Party
(the "Notifying Party") giving the other Party (the "Notified Party") written
notice of a situation that is thought to materially affect the performance of
the Notified Party's obligations under this Agreement (the "First Notice").
Within four (4) weeks of the Notified Party's receipt of the First Notice, the
Parties shall meet together in a face-to-face meeting in a place to be mutually
agreed. The Parties shall work together to address the issues raised in the
First Notice for ninety (90) days following the Notified Party's receipt of the
First Notice. If such issues are not resolved to the Notifying Party's
reasonable satisfaction within such ninety (90)-day period, the Notifying Party
may then provide additional written notice (the "Second Notice") to the Notified
Party of the termination of this Agreement, effective immediately following the
Notified Party's receipt of the Second Notice. Upon any termination of this
Agreement pursuant to this Section 9.3, CombiChem shall repay to ONO within
fifteen (15) business days following such termination any unused portion of a
ONO research support payment which has been paid pursuant to Section 8.2 hereof
calculated on a monthly basis.

                9.4 After Termination. Any termination of this Agreement or the
Lead Generation Program shall be without prejudice to the accrued rights of
either Party prior to the termination. In case of termination of this Agreement
or the Lead Generation Program pursuant to Sections 9.2 or 9.3 above, all
royalty, milestone and other payment obligations set forth in Sections 8.3, 8.4,
8.5, 8.6 and 8.7 hereof shall survive any such termination. Moreover, unless
otherwise specified, ONO shall not be entitled to any refund of any payments
made to CombiChem hereunder upon the expiration of the term of this Agreement or
earlier termination pursuant to this Article 9.


        10. CONFIDENTIAL INFORMATION

                10.1 Nondisclosure. During the term of this Agreement and for a
period of five (5) years after termination or expiration thereof, each Party
shall maintain all Confidential Information in trust and confidence and shall
not disclose any Confidential Information to any third party or use any
Confidential Information for any purpose except (i) as expressly authorized by
this Agreement, (ii) as required by law or court order, after as much advance
notice as is practical to the other Party, (iii) to its consultants,
subcontractors, licensees or potential licensees, clinical investigators,
affiliates, employees or agents who need to know to accomplish the purposes of
this Agreement and who are bound by equivalent written confidentiality
obligations. 




                                      -19-
<PAGE>   21

Each Party may use the other Party's Confidential Information only to the extent
required to accomplish the purposes of this Agreement. Each Party will use at
least the same standard of care as it uses to protect proprietary or
confidential information of its own to ensure that its Affiliates, employees,
agents, consultants and other representatives do not disclose or make any
unauthorized use of the Confidential Information. Each Party will promptly
notify the other upon discovery of any unauthorized use or disclosure of the
Confidential Information. Notwithstanding the foregoing, CombiChem shall
maintain all Confidential Information in trust and confidence and shall not
disclose any Confidential Information to any Third Party or use any Confidential
Information for any purpose with regard to Confidential Information disclosed by
ONO to CombiChem pursuant to Sections 1 and 2 of Schedule C until the expiration
of the Research Patent covering the Product.

                10.2 Exceptions. Confidential Information shall not include any
information which the receiving Party can prove by competent evidence: (a) is
now, or hereafter becomes, through no act or failure to act on the part of the
receiving Party, generally known or available; (b) is known by the receiving
Party at the time of receiving such information, as evidenced by its written
records; (c) is hereafter disclosed to the receiving Party by a Third Party, as
a matter of right and without restriction on disclosure; (d) is independently
developed by the receiving Party without the aid, application or use of
Confidential Information; or (e) is the subject of a written permission to
disclose provided by the disclosing Party.


        11. PUBLICATIONS AND PUBLIC STATEMENTS

                11.1 Publications.

                        (a) Without affecting obligations under Article 10
above, neither Party shall publish any information with respect to any Research
Compound, Active Compound, Derivative, Improved Derivative, Preclinical Lead
Compound or Development Compound during the Exclusivity Period without the prior
written permission of the other Party. If the proposing Party wishes to obtain
such permission, it shall provide the other Party with the manuscript for
publication or presentation for the other Party's review prior to the submission
of such manuscript for publication or presentation. The other Party shall notify
the proposing Party of the disapproval or approval of such publication or
presentation within thirty (30) days after receipt of such manuscript by such
other Party. Such permission not to be unreasonably withheld. Such thirty (30)
day period shall not be extended unless the other Party requests additional time
until the submission of a Patent to the competent authorities for the purpose of
protecting its intellectual property position; provided, however, ONO may
publish scientific information with regard to pharmacology, pharmacy and
chemistry, toxicology, metabolism, pharmaceutical, clinical studies of the
Development Compound and Product without the prior written consent of CombiChem.

                        (b) Following the Exclusivity Period, ONO may publish
any information or material concerning an Active Compound, Derivative, Improved
Derivative, Preclinical Lead Compound, Development Compound or Product arising
out of the Lead Generation Program or generated solely by ONO after the Research
Period without the prior written consent of CombiChem.




                                      -20-
<PAGE>   22

                11.2 Public Statements. Neither Party shall use the name of the
other Party in any public statement, prospectus, annual report or press release
or other public communication (collectively "Public Statements") (except to the
extent that use of the name is required for disclosure by the Securities and
Exchange Commission or other governmental rules or regulations (with notice to
be provided by CombiChem to ONO in such circumstances)) without the prior
written approval of the other Party, which may not be unreasonably withheld or
delayed; provided, however, that both Parties shall endeavor in good faith to
give the other Party a minimum of five (5) business days to review such Public
Statements; provided, further, that, upon approval of any such Public Statement,
both Parties may disclose to Third Parties the information contained in such
Public Statement without the further approval of the other; and provided,
further, that if a Party does not approve such Public Statement, either Party
may still use the name of the other Party in any Public Statement, if such Party
is advised by counsel that such disclosure is required to comply with applicable
law so long as prior written notice of such counsel's view is provided to the
other Party.


        12. INDEMNIFICATION

                12.1 EACH PARTY HEREBY AGREES TO SAVE, DEFEND AND HOLD THE OTHER
PARTY, ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, CONSULTANTS, AGENTS,
LICENSEES AND STOCKHOLDERS HARMLESS FROM AND AGAINST ANY AND ALL SUITS, CLAIMS,
ACTIONS, DEMANDS, LIABILITIES, EXPENSES AND LOSSES, INCLUDING REASONABLE LEGAL
EXPENSES AND ATTORNEYS' FEES ("LOSSES") RESULTING DIRECTLY OR INDIRECTLY FROM
(A) ANY BREACH OF THE INDEMNIFYING PARTY'S OBLIGATION HEREUNDER, OR (B) THE
NEGLIGENCE, OR RECKLESSNESS OR INTENTIONAL ACTS OR OMISSIONS IN CONNECTION WITH
THE WORK PERFORMED BY OR ON BEHALF OF THE INDEMNIFYING PARTY HEREUNDER.

                12.2 SUBJECT TO THE PROVISIONS ABOVE, EACH PARTY HEREBY AGREES
TO SAVE, DEFEND AND HOLD THE OTHER PARTY, ITS AFFILIATES, OFFICERS, DIRECTORS,
EMPLOYEES, CONSULTANTS, AGENTS, LICENSEES AND STOCKHOLDERS HARMLESS FROM AND
AGAINST THE LOSSES RESULTING DIRECTLY OR INDIRECTLY FROM (A) THE USE BY OR ON
BEHALF OF THE INDEMNIFYING PARTY, ITS AFFILIATES OR LICENSEES OF RESULTS
ACHIEVED BY INDEMNIFYING PARTY HEREUNDER OR (B) THE MANUFACTURE, DEVELOPMENT,
USE, HANDLING, STORAGE, SALE OR OTHER DISPOSITION OF CHEMICAL AGENTS, RESEARCH
COMPOUNDS, ACTIVE COMPOUNDS PRECLINICAL LEAD COMPOUNDS, DERIVATIVES, IMPROVED
DERIVATIVES, DEVELOPMENT COMPOUNDS OR PRODUCTS BY SUCH INDEMNIFYING PARTY, ITS
AFFILIATES OR LICENSEES, EXCEPT TO THE EXTENT SUCH LOSSES RESULT FROM THE
NEGLIGENCE (WHETHER ACTIVE, PASSIVE OR IMPUTED), BREACH OF THIS AGREEMENT OR
WILLFUL MISCONDUCT OF THE PARTY CLAIMING A RIGHT OF INDEMNIFICATION UNDER THIS
ARTICLE 12.

                12.3 Infringement.




                                      -21-
<PAGE>   23

                        (a) Subject to subsection 12.3(c) below, ONO shall hold
CombiChem and its officers, directors, employees, consultants, and agents
harmless from and against any and all losses resulting from the infringement of
any Third Party's Patent issued as of the Effective Date due to the performance
by ONO or its Affiliates of any activity contemplated hereunder, including, but
not necessarily limited to, ONO's responsibilities under Section 2.2 above,
developing Products, and selling Products.

                        (b) Subject to subsection 12.3(c) below, CombiChem shall
hold ONO and its officers, directors, employees, consultants, and agents
harmless from and against any and all losses resulting from the infringement of
any Third Party's Patent issued as of the Effective Date due to the performance
by CombiChem of any activity contemplated hereunder, including, but not
necessarily limited to, CombiChem's responsibilities under Section 2.1 above.

                        (c) The indemnity provided in subsections 12.3(a) and
12.3(b) above shall not apply where the loss is due to the breach by the
indemnified Party of a warranty made in Article 18.

                12.4 Procedures. If either Party (the "Indemnified Party") seeks
indemnification under this Article 12, it shall inform the other Party (the
"Indemnifying Party") of a claim as soon as reasonably practicable after it
receives notice of the claim, shall permit the Indemnifying Party to assume
direction and control of the defense of the claim (including the right to settle
any claim brought against the Indemnified Party upon prior written consent of
the Indemnified Party, which shall not be unreasonably withheld), and shall give
reasonable cooperation (at the expense of the Indemnifying Party) in the defense
of such claim.

                12.5 Insurance. CombiChem and ONO each shall maintain, through
self insurance or otherwise, insurance with respect to their respective
activities contemplated by this Agreement, in such amount and for such term as
CombiChem or ONO, respectively, customarily maintains covering its similar
activities.


        13. ASSIGNABILITY

                This Agreement may not be assigned by either Party without the
prior written consent of the other Party, not to be unreasonably withheld;
provided, however, that either Party may assign this Agreement, in whole or in
part, to an Affiliate or in whole to a successor of a Party in connection with
the merger, consolidation or sale of all or substantially all of such Party's
assets or that portion of its business pertaining to the subject matter of this
Agreement (and upon doing so will promptly notify the other Party in writing);
provided that the assigning Party remains fully liable as obligated hereunder.


        14. DISPUTE RESOLUTION PROCEDURES

                14.1 Senior Executive's Discussions. If a dispute arises between
CombiChem and ONO out of the performance of the obligations of either Party
hereunder during the term of this Agreement, such dispute will be referred to
the appropriate senior management in the area of the dispute. If such senior
management are unable to resolve such dispute within thirty (30) days 




                                      -22-
<PAGE>   24

following the initiation of discussions between them, such dispute shall be
settled by arbitration as described in Section 14.2 below.

                14.2 Binding Arbitration. If the Parties have not been able to
resolve the dispute as provided in Section 14.1 above, the dispute shall be
finally settled by binding arbitration. Any arbitration hereunder shall be
conducted under the arbitration rules of the *** . If arbitration is demanded by
*** , such arbitration shall take place in *** , and it demanded by *** , it
shall take place in *** . The arbitration shall be conducted before three
arbitrators (at lease one of which shall be an independent expert in
pharmaceutical product development, including clinical development and
regulatory affairs), chosen according to the following procedure: each of the
parties shall appoint one arbitrator and the two (2) so nominated shall choose
the third. If the arbitrators chosen by the Parties cannot agree on the choice
of the third arbitrator within a period of thirty (30) days after their
appointment, then the third arbitrator shall be appointed by arbitration
association in the place where arbitration shall take place. The arbitrators
shall have the authority to grant specific performance, and to allocate between
the Parties the costs of arbitration, including but not limited to the
reasonable attorneys' fees, in such equitable manner as they determine. The
arbitral award (i) shall be final and binding upon the Parties; and (ii) may be
entered into any court of competent jurisdiction.

                14.3 Confidentiality. All arbitration proceedings under this
Article 14 shall be confidential and the arbitrators may issue appropriate
protective orders to safeguard the Parties' Confidential Information. Except as
required by law, neither Party shall make (or instruct any arbitrator to make)
and public announcement with respect to the proceedings or decisions of any
arbitration without the prior written consent of the other Party. The existence
of any unresolved dispute, the submission of an unresolved dispute to
arbitration pursuant to this Article 14, and any award by arbitrators, shall be
kept in confidence by the Parties and the arbitrators, except as required in
connection with the enforcement of such award or implementation of such
decisions, as mutually agreed by the Parties or as required by law.

                14.4 Injunctive and Other Relief. Nothing contained in this
Article 14 or any other provisions of this Agreement shall be construed to limit
or preclude a Party from bringing any action in any court of competent
jurisdiction for injunctive or other provisional relief to compel the other
Party to comply with its obligations hereunder before or during the pendency of
arbitration proceedings.


        15. NOTICES

                Any notice required or permitted to be given hereunder shall be
deemed sufficient if sent by facsimile letter or overnight courier, or delivered
by hand to ONO or CombiChem at the respective addresses and facsimile numbers as
set forth below or at such other address and facsimile number as either Party
hereto may designate. If sent by facsimile letter, notice shall be 

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                                      -23-
<PAGE>   25

deemed given when the transmission is completed if the sender has a confirmed
transmission report. If a confirmed transmission report does not exist, then the
notice will be deemed given when the notice is actually received by the person
to whom it is sent. If delivered by overnight courier, notice shall be deemed
given when it has been signed for. If delivered by hand, notice shall be deemed
given when received.

               if to CombiChem, to:

                             CombiChem, Inc.
                             9050 Camino Santa Fe
                             San Diego, California 92121
                             Attention: President
                             Fax number: (619) 530-9998

                      with a copy to:

                             Brobeck, Phleger & Harrison LLP
                             550 West C Street, Suite 1200
                             San Diego, California 92101
                             Attention: Faye H. Russell, Esq.
                             Fax number: (619) 234-1966

                      if to ONO to:

                             ONO Pharmaceutical Co., Ltd.
                             1-5 Doshomachi, 2-Chome, Chuo-Ku
                             Osaka 541-8526 Japan
                             Attention:  Director, International Business
                             Fax Number:  (06) 6222-2381

                      with a copy to:

                             ONO Pharmaceutical Co., Ltd.
                             Minase Research Institute
                             3-7-1 Sakurai Shimamoto Mishima
                             Okasa 618-8585 Japan
                             Attention:  Director, Discovery Planning
                             Fax Number:  (075) 962-9314


        16. SURVIVAL

                Without prejudice to the provisions of Section 9.4 hereof, the
provisions of Sections 2.4, 4.1, 4.2, 4.3 and Articles 3, 7, 8, 10, 11, 12, 14,
15, 17 and this Article 16 shall survive expiration of this Agreement pursuant
to Section 9.1 or termination of this Agreement in addition to those provisions
which by their terms survive.




                                      -24-
<PAGE>   26

        17. ADDITIONAL TERMS

                17.1 Entire Agreement. This Agreement, including all Schedules
attached to this Agreement, constitutes the entire understanding between the
Parties with respect to the subject matter hereto and supersedes and replaces
all previous negotiations, understandings, representations, writings and
contract provisions and rights relating hereof.

                17.2 Amendment; No Waiver. No provision of this Agreement may be
amended, revoked or waived except by a writing signed and delivered by an
authorized officer of each Party. Any waiver on the part of either Party of any
breach or any fight or interest hereunder shall not imply the waiver of any
subsequent breach or waiver of any other right or interest.

                17.3 Validity. The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provision of this Agreement, each of which shall remain in full force
and effect.

                17.4 English Language. This Agreement is entered into in the
English language. All meetings and correspondence between the Parties are to be
in English. In the event of any dispute concerning the construction or meaning
of this Agreement, reference shall be made only to this Agreement as written in
English and not to any translation into any other language.

                17.5 Headings. The descriptive headings are inserted for
convenience of reference only and are not intended to be part of or to affect
the meaning of or interpretation of this Agreement.

                17.6 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, and all of which
together shall be deemed to be one and the same instrument.

                17.7 Governing Law. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of California,
without regard to conflicts of laws principles.

                17.8 Further Assurances. At any time and from time to time after
the Effective Date, the Parties shall each do, execute, acknowledge and deliver,
and cause to be done, executed, acknowledged or delivered, all such further
acts, transfers, conveyances, or assignments as may be reasonably required to
carry out the transactions contemplated by this Agreement.


        18. REPRESENTATIONS AND WARRANTIES

                18.1 Authorization. All action on the part of each of CombiChem,
ONO and their respective officers, and directors necessary for the
authorization, execution and delivery of this Agreement and the performance of
all obligations of CombiChem, ONO and ONO, respectively, hereunder has been
taken.




                                      -25-
<PAGE>   27

                18.2 Rights to Intellectual Property. Each Party warrants that
it has the power to grant all of the rights granted and make such required
assignments, and to assume all of the obligations required, under this
Agreement. Under no circumstances does CombiChem warrant to ONO that ONO's
rights in any ONO Compound and/or Products are exclusive to the extent such ONO
Compound and/or Products may be covered under the patent claims of Third Parties
wherein such claims are not the direct result of a collaboration between the
Third Party and CombiChem.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]






                                      -26-
<PAGE>   28

        IN WITNESS WHEREOF, the parties have executed this Agreement to be
effective as of the Effective Date.

COMBICHEM, INC.                        ONO PHARMACEUTICAL CO., INC.


By:   /s/  Vicente Anido               By:   /s/ Illegible
   --------------------------------       --------------------------------------
           Vicente Anido               

Its:    President & CEO                Its: President
    -------------------------------        -------------------------------------

Date:      December 28, 1998           Date:     December 28th, 1998
     ------------------------------         ------------------------------------



                               [SIGNATURE PAGE TO
                       LEAD GENERATION PROGRAM AGREEMENT]


<PAGE>   29

                                   SCHEDULE A

                        First and Second Year Benchmarks


First Year Benchmarks



                                       ***


Second Year Benchmarks

                                       ***


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<PAGE>   30


                                   SCHEDULE B

                           Milestones and Payments(1)


                                      ***








(1)     Paid in U.S. Dollars

(2)     Paid for each compound which achieves the stated milestone.



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<PAGE>   31

                                   SCHEDULE C

                             Reporting Requirements


The reports with respect to Products to be delivered pursuant to this Agreement
will be submitted by ONO to CombiChem as follows and will include the following:

        1.      When filed and annually thereafter, if not previously provided:

                (a) Copies of the preclinical pharmacology and toxicology
summaries prepared for the IND and NDA (or foreign equivalents) for each
Product.

                (b) Copies of the Integrated Summary of Efficacy and Integrated
Summary of Safety prepared for the NDA (or foreign equivalent) for each Product.

        2.      During the month of July and January of each year:

                (a) Any projected and actual initiation dates and completion
dates and the phase, i.e., Phase I, Phase II and Phase III, of clinical trials
for each Product in the Field.

                (b) The projected and actual completion dates of each trial for
each Product in the Field.

                (c) Any projected and actual dates of NDA (or foreign
equivalent) submissions for each Product.

                (d) Status of Patents and Patent applications both within and
outside the United States.

                (e) Occurrence of any milestone events.

                (f) Any permitted licensing under this Agreement.

        3.      Promptly following publication, copies of any publications
(preclinical and clinical) by ONO or its investigators or ONO's third party
collaborators/investigators concerning a Product. Notwithstanding the provisions
of Section 17.4 of the Agreement, ONO shall not be obligated to translate such
copies into English for this provision.

        4.      Promptly following presentation, use good faith efforts to
provide copies of materials presented to financial analysts in significant
presentations which involved new information concerning a Product.
Notwithstanding the provisions of Section 17.4 of the Agreement, ONO shall not
be obligated to translate such copies into English for this provision.

                ONO will notify CombiChem of any delays in the development of
any Product as outlined above and will summarize the cause(s) of such delay.




<PAGE>   32

                                   SCHEDULE D

                                  Research Plan

                                       ***







- ----------

        *** Portions of this page have been omitted pursuant to a request for
Confidential Treatment and filed separately with the Commission



<PAGE>   33

                                   SCHEDULE E

                                 Major Countries

Japan
South Korea
United States
Any country included in the European Patent Convention (currently consisting of
the United Kingdom, France, Germany, Italy, Switzerland, Netherlands, Belgium,
Luxembourg, Denmark, Spain, Portugal, Greece, Sweden, Finland, Austria and
Ireland)



<PAGE>   1
                                                                    EXHIBIT 21.1

                                 CombiChem Inc.
                           Subsidiaries of Registrant


CombiChem JVR, Inc., a Delaware Corporation


<PAGE>   1

                                                                   EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the 1997 Stock Incentive Plan and 1997 Employee Stock
Purchase Plan of CombiChem, Inc. of our report dated January 18, 1999, except
for Note 9, as to which the date is March 5, 1999, with respect to the financial
statements of CombiChem, Inc. included in the Annual Report (Form 10-K) for the
year ended December 31, 1998, filed with the Securities and Exchange Commission.

                                        ERNST & YOUNG LLP

San Diego, California
March 26, 1999

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AT DECEMBER 31, 1998 (AUDITED) AND THE STATEMENT OF OPERATIONS FOR THE
YEAR ENDED DECEMBER 31, 1998 (AUDITED) AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998.
</LEGEND>
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          29,359
<SECURITIES>                                         0
<RECEIVABLES>                                    2,892
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                33,561
<PP&E>                                          10,844
<DEPRECIATION>                                   2,943
<TOTAL-ASSETS>                                  41,980
<CURRENT-LIABILITIES>                            7,415
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            13
<OTHER-SE>                                      30,163
<TOTAL-LIABILITY-AND-EQUITY>                    41,980
<SALES>                                              0
<TOTAL-REVENUES>                                15,074
<CGS>                                                0
<TOTAL-COSTS>                                   19,112
<OTHER-EXPENSES>                                 (180)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 905
<INCOME-PRETAX>                                (3,312)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (3,312)
<DISCONTINUED>                                       0
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<CHANGES>                                            0
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<EPS-PRIMARY>                                   (0.36)
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</TABLE>


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