BOSTON LIFE SCIENCES INC /DE
424B3, 1996-08-15
PHARMACEUTICAL PREPARATIONS
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     PROSPECTUS


                               10,826,170 Shares

                           Boston Life Sciences, Inc.

                           Common Stock and Warrants

                              ____________________


     The securities offered hereby consist of (i) 10,826,170 shares of common
     stock, $.01 par value per share (the "Common Stock"), and (ii) 599,770
     warrants (the "Warrants"), each of which entitles the holder thereof to
     purchase one share of Common Stock of Boston Life Sciences, Inc., a
     Delaware corporation ("BLSI" or the "Company"), which are owned by the
     selling stockholders listed herein under "Selling Stockholders"
     (collectively, the "Selling Stockholders") (the Common Stock and Warrants
     offered hereby are collectively referred to as the "Securities").  All
     expenses of registration incurred in connection herewith are being borne by
     the Company, but all selling and other expenses incurred by a Selling
     Stockholder will be borne by that Selling Stockholder.  The Company will
     not receive any of the proceeds from the sale of the Securities by the
     Selling Stockholders.

     The Selling Stockholders have not advised the Company of any specific plans
     for the distribution of the Securities covered by this Prospectus, but it
     is anticipated that the Securities will be sold from time to time primarily
     in transactions (which may include block transactions) on The Nasdaq
     SmallCap Market of the Nasdaq Stock Market, Inc. (the "Nasdaq SmallCap
     Market") at the market price then prevailing, although sales may also be
     made in negotiated transactions or otherwise.  The Selling Stockholders and
     the brokers and dealers through whom sale of the Securities may be made may
     be deemed to be "underwriters" within the meaning of the Securities Act of
     1933, as amended (the "Securities Act"), and their commissions or discounts
     and other compensation may be regarded as underwriters' compensation.  See
     "Plan of Distribution."

     The Common Stock is traded on the Nasdaq SmallCap Market under the symbol
     "BLSI." On August 12, 1996, the last reported closing price of the Common
     Stock was $0.9375 per share. The Warrants are not currently traded on any
     national securities exchange (including the Nasdaq Stock Market). The 
     Company has submitted the Warrants for listing on the Nasdaq SmallCap
     Market under the symbol "BLSI(W)," but to maintain trading in connection
     with such listing, the Nasdaq Stock Market requires that there be at least
     two market makers for any such security. To date, there have not yet been
     two market makers for the Warrants, and therefore the Warrants have not
     been traded on the Nasdaq SmallCap Market and before the Warrants may be
     listed, the Company will be required to submit another listing application
     for the Warrants to the Nasdaq Stock Market. Therefore there can be no
     assurance that the Warrants will qualify for inclusion in the Nasdaq Small
     Cap Market or if so listed, that such trading will be maintained.

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


     An investment in the Common Stock and Warrants offered hereby involves a
     high degree of risk.  See "Risk Factors" beginning on page 5 of this
     Prospectus.

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

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

                 The date of this Prospectus is August 15, 1996.
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     No dealer, salesman or other person has been authorized to give any
     information or to make any representation not contained in or incorporated
     by reference in this Prospectus and, if given or made, such information or
     representation must not be relied upon as having been authorized by the
     Company, the Selling Shareholders or any other person.  This Prospectus
     does not constitute an offer to sell or a solicitation of an offer to buy
     any of the securities offered hereby in any jurisdiction to any person to
     whom it is unlawful to make such an offer in such jurisdiction.  Neither
     the delivery of this Prospectus nor any sale made hereunder shall, under
     any circumstances, create any implication that the information herein is
     correct as of any time subsequent to the date hereof or that there has been
     no change in the affairs of the Company since that date.

                             AVAILABLE INFORMATION

     This Prospectus, which constitutes a part of a Registration Statement on
     Form S-3 (the "Registration Statement") filed by the Company with the
     Securities and Exchange Commission (the "Commission") under the Securities
     Act, omits certain of the information set forth in the Registration
     Statement.  Reference is hereby made to the Registration Statement and to
     the exhibits thereto for further information with respect to the Company
     and the securities offered hereby.  Copies of the Registration Statement
     and the exhibits thereto are on file at the offices of the Commission and
     may be obtained upon payment of the prescribed fee or may be examined
     without charge at the public reference facilities of the Commission
     described below.

     Statements contained herein concerning the provisions of documents are
     necessarily summaries of such documents, and each statement is qualified in
     its entirety by reference to the copy of the applicable document filed with
     the Commission.

     The Company is subject to the informational requirements of the Securities
     Exchange Act of 1934, as amended (the "Exchange Act"), and, accordingly,
     files reports, proxy statements and other information with the Commission.
     Such reports, proxy statements and other information can be inspected and
     copied at the public reference facilities maintained by the commission at
     Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549,
     and at the Commission's Regional Offices located at Seven World Trade
     Center, New York, New York 10048 and Northwestern Atrium Center, 500 West
     Madison Street, Suite 1400, Chicago, Illinois 60661.  Copies of such
     documents may also be obtained form the Public Reference Section of the
     Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C.
     20549, at prescribed rates.  In addition, reports and proxy statements
     concerning the Company can be inspected at the offices of the National
     Association of Securities Dealers, Inc., 1735 K Street, N.W., Washington,
     D.C. 20006.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents or portions of documents filed by the Company (File
     No. 0-6533) with the Commission are incorporated hereby by reference:

          (a)  Annual Report on Form 10-K, as amended by Form 10-K/A, for the
               fiscal year ended December 31, 1994.

          (b)  Annual Report on Form 10-K, as amended by Form 10-K/A, for the
               fiscal year ended December 31, 1995.

          (c)  Quarterly Report on Form 10-Q for the quarter ended March 31,
               1996.

          (d)  Quarterly Report on Form 10-Q for the quarter ended June 30, 
               1996.

          (e)  Current Report on Form 8-K filed June 26, 1996.

          (f)  Current Report on Form 8-K filed July 9, 1996.

          (g)  Current Report on Form 8-K filed July 19, 1996.

          (h)  Report on Form 10-C filed July 8, 1996.

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          (i)  The description of the Company's Common Stock which is contained
     in the Company's Registration Statement on Form 8-A filed under the
     Exchange Act, including any amendment or reports filed for the purpose of
     updating such description.

     All reports and other documents subsequently filed by the Company pursuant
     to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the
     filing of a post-effective amendment which indicates that all securities
     offered hereby have been sold or which deregisters all securities remaining
     unsold, shall be deemed to be incorporated by reference in this Prospectus
     and to be a part hereof from the date of the filing of such reports or
     documents.  Any statement contained in a document, all or a portion of
     which is incorporated by reference herein, shall be deemed to be modified
     or superseded for purposes of this Prospectus to the extent that a
     statement contained or incorporated by reference herein modifies or
     supersedes such statement.  Any statement so modified or superseded shall
     not be deemed, except as so modified or superseded, to constitute a part of
     this Prospectus.

     Upon request, the Company will provide without charge to each person to
     whom this Prospectus is delivered a copy of any or all of such documents
     which are incorporated herein by reference (other than exhibits to such
     documents unless such exhibits are specifically incorporated by reference
     into the documents that this Prospectus incorporates).  Written or oral
     requests for copies should be directed to Marc E. Lanser, M.D., Executive
     Vice President and Chief Scientific Officer, 33 Newbury Street, Suite 300,
     Boston, Massachusetts 02116, telephone number (617) 425-0200.

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                                  THE COMPANY


     Boston Life Sciences, Inc. ("BLSI" or the "Company") is the result of a
     merger (the "Merger") between BLSI and Greenwich Pharmaceuticals
     Incorporated ("Greenwich").  The Merger took place on June 15, 1995 and
     resulted in a publicly traded company managed by the Board of Directors and
     management of Boston Life Sciences, Inc. ("Old BLSI"), the company existing
     prior to the Merger.

     BLSI is a development stage biotechnology company engaged in the research
     and development of novel therapeutic and diagnostic products to treat
     chronic debilitating diseases, such as cancer, Parkinson's Disease, central
     nervous system (CNS) disorders and autoimmune diseases.  With the exception
     of the technologies originating with Greenwich, all of BLSI's technologies
     currently under development were invented or discovered by researchers
     working at Harvard University and/or its affiliated hospitals ("Harvard and
     its Affiliates").  In addition, as a result of the Merger, BLSI in the case
     of THERAFECTIN(R) amiprilose HC1 ("THERAFECTIN"), a product that had
     previously been pursued by Greenwich, commenced a Phase III trial in the
     second quarter of 1996.

     CORPORATE STRATEGY

     The Company intends to (i) fund the early development of its compounds in
     preclinical development and (ii) enter into corporate partnering
     arrangements with established pharmaceutical or biotechnology companies to
     support the continued development of BLSI's compounds and potential
     marketing of any products following government approvals.  Additionally,
     BLSI does not currently own any laboratory or manufacturing facilities and
     intends to contract out for such services.

     With the addition of Greenwich's carbohydrate technologies acquired in the
     Merger, BLSI will also be formulating a strategy to address the potential
     future requirements of THERAFECTIN with the ultimate objective of obtaining
     U.S. Food and Drug Administration (FDA) approval.  See "Products Under
     Development and Research Programs -- Compounds Approved for Clinical
     Development."  There can be no assurances, however, that the implementation
     of any strategy would ultimately result in the approval of THERAFECTIN by
     the FDA.

     STRATEGIC ALLIANCES

     In June 1995, BLSI entered into a research and development collaboration
     agreement with Zeneca Pharmaceuticals, Ltd. ("Zeneca") for all indications,
     on a worldwide basis, of BLSI's MHC Class II Inhibition technology.  The
     collaboration calls for Zeneca to fund approximately the first two years of
     research and for BLSI to receive payments from Zeneca as lead compounds
     reach traditional clinical development milestones.  In addition, BLSI will
     receive royalties payable on the sale of any products originating from the
     collaboration.

     BLSI is also a party to collaborations for THERAFECTIN with Irotec
     Laboratories of Cork, Ireland ("Irotec") to market amiprilose HCl in the
     territories of the Republic of Ireland and the Netherlands.  Unless BLSI
     obtains marketing approval for THERAFECTIN in the United States and Irotec
     obtains marketing approval of amiprilose HCl in its regions, the future
     milestone payments from Irotec will not be received.

     PRODUCTS UNDER DEVELOPMENT AND RESEARCH PROGRAMS

          Compounds Approved for Clinical Development

     THERAFECTIN.  The Company commenced a Phase III clinical trial for
     THERAFECTIN in the second quarter of 1996.  THERAFECTIN previously formed
     the foundation of Greenwich's drug development efforts. Early work on
     THERAFECTIN revealed potent pharmacologic effects, e.g. enhancement of
     killing and clearance of intracellular pathogens (including bacteria,
     fungi, viruses, parasites) and anti-tumor activity.  Further work supported
     the immunostimulatory effects of THERAFECTIN.  As the significant anti-
     inflammatory effects of other known immunostimulants (levamisole and
     muramyl dipeptide) were well documented, investigations of the potential
     anti-inflammatory activity of THERAFECTIN were initiated.

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     Since the Merger, the Company has actively been engaged in a review of the
     THERAFECTIN preclinical and clinical data, including the IND and NDA
     filings made with FDA, correspondence between Greenwich and FDA, and the
     transcripts of the Arthritis Advisory Committee meetings.  The Company has
     sought input from outside independent regulatory affairs consultants and
     reviewed the preclinical and clinical data with certain of Greenwich's
     scientific and regulatory affairs personnel.  Based on its analysis, the
     Company concluded that there was sufficient evidence of therapeutic
     efficacy and that further investigation of the clinical development of
     THERAFECTIN was warranted.  To this end, the Company has assembled a panel
     comprised of expert academic clinical rheumatologists and enlisted the aid
     of medical, regulatory, and statistical consultants to assist BLSI in
     formulating a clinical strategy for THERAFECTIN.  The Company held a
     consensus meeting with the entire panel and its consultants to discuss such
     strategy (including potential protocols for any possible additional
     clinical study) for THERAFECTIN.  In November, the Company submitted to FDA
     a draft protocol for a proposed Phase III study of THERAFECTIN.  The draft
     protocol is for a double-blind, placebo-controlled, multi-center study
     similar to a successful Phase III study (RA-9) previously performed by
     Greenwich.   The Company has met with FDA to discuss the protocol and the
     double blind study commenced in the second quarter of 1996.

     ALTROPANE (Parkinson's Disease-Diagnostic Agent).  BLSI is developing a
     nuclear medicine imaging agent, Altropane, that it believes will be useful
     in the early diagnosis of Parkinson's Disease at its early stages, prior to
     the onset of specific symptoms.  Since administration of currently
     available therapies in the early stages of Parkinson's Disease may delay
     the progression of the disease, early definitive diagnosis may be of
     substantial benefit.  ALTROPANE recently completed Phase I/II clinical
     testing under a physician-sponsored IND with encouraging results which
     indicate that Altropane is a safe, accurate and convenient agent to image
     the dopamine transporter system in the brain.  Results from this study
     showed that the use of Altropane together with SPECT brain scanning
     demonstrated a greater than 70% loss of dopamine transporters in patients
     with mild clinical disease, while patients with more severe disease were
     shown to have had an even greater loss.  In one patient in whom the
     diagnosis of Parkinson's Disease was in dispute, physicians in the study
     using Altropane demonstrated that the patient did not in fact have
     Parkinson's Disease.

          Preclinical Development Programs

     CDI (Cartilage-Derived Inhibitor).  BLSI is developing a factor derived
     from cartilage called CDI, which inhibits new blood vessel formation.
     Angiogenesis (new blood vessel formation) plays a role in the growth and
     spread of solid tumors throughout the body because cancerous tumors require
     new blood vessels in order to grow and metastasize.  The Company's
     collaborating scientists have isolated and cloned CDI, and the Company
     commenced large-scale animal testing in the second quarter of 1996.  BLSI
     plans to develop CDI for the treatment of solid tumors and other diseases
     of neovascularization, including rheumatoid arthritis and numerous eye
     diseases.

     Autoimmune Diseases  (Inhibition of the Expression of MHC Molecules).
     Autoimmune diseases are characterized by the production of antibodies
     directed against the body's own tissues, and the consequent destruction of
     those tissues by the body's immune cells.  Central to the pathogenesis of
     these diseases is the expression of MHC (Major Histocompatibility Complex)
     class II DR molecules on the surface of antigen-presenting cells that are
     found within the tissues that are attacked in autoimmune disease.  The
     Company is developing a means to specifically inhibit MHC DR expression.
     Inhibition of DR expression might provide a specific treatment for
     autoimmune diseases, and because of its specificity, this treatment might
     be relatively free of side effects.  In June 1995, BLSI entered into a
     research and development collaboration agreement with Zeneca for all
     indications, on a worldwide basis, of BLSI's MHC Class II Inhibition
     technology.  See "The Company -- Strategic Alliances."

     C-MAF.  The Company recently obtained an exclusive worldwide license to a
     patent application concerning a recently-discovered transcription factor
     called C-MAF.  C-MAF has been shown, in preclinical in vitro tests, to
     regulate the switching of T helper 1 (Th1) cells into T helper 2 (Th2)
     cells.  The ability to switch Th1 cells into Th2 cells (and vice versa) may
     be significant in the treatment of autoimmune diseases and allergies.  C-
     MAF was discovered by a team of scientists led by Professor Laurie H.
     Glimcher at Harvard University, and this factor and its uses for treatment
     of such diseases have been exclusively licensed by Harvard to the Company.

     Cancer  (Tumor Targeting).  Monoclonal antibodies (MAbs) have high
     specificity and high affinity and/or avidity for their antigens.  Because
     of this, MAbs have been considered particularly attractive as selective
     carriers of diagnostic and therapeutic products.  Recently, problems such
     as low per cent maximum injected dose per gram of

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     target tissue and slow clearance and nonuniform distribution within tumors
     have led many to question the future of MAbs in radioimmunodiagnosis and
     radioimmunotherapy.  There is thus a need for new methods for directing
     therapeutic molecules to tumors that do not rely upon strict structural
     integrity of all MAb molecules used, and could ensure delivery of
     sufficient doses of radiotherapy to tumors without harming normal tissues.
     The Company is currently developing such a system to target radiotherapy to
     solid tumors.  This system is comprised of sequential specific binding
     pairs of reagents that are injected in such a manner that the binding
     between functional groups is specific and the results are maximally
     amplified.

     Central Nervous System  (Axogenesis Factor 1).  Axogenesis Factor 1 (AF-1)
     is a recently discovered nerve growth factor that has the unique
     characteristic of being the only factor identified so far that promotes
     axon outgrowth from central nervous system (CNS) cells (i.e. CNS
     regeneration).  This property is significant, since the zone of partial
     injury surrounding the central necrotic zone of a stroke contains live but
     damaged nerve cells that have lost their axons.  AF-1 would therefore
     potentially salvage these partially injured cells, resulting in some
     recovery of function.  The same phenomena occurs in brain injury and in
     spinal cord trauma.  The Company hopes that AF-1 could provide the first
     truly "regenerative" treatment for these conditions.  Since the discovery
     of AF-1 over one year ago, AF-1 has been purified and amino acid
     composition has been obtained.  AF-1 is a peptide having 5 amino acids,
     which could make it relatively simple to manufacture.  Following amino acid
     sequencing of AF-1, the Company believes that quantities sufficient for in
     vitro and in vivo testing could be made without difficulty and at a
     reasonable price.  This material will then be tested in an animal model of
     spinal cord injury and stroke.  If the animal models are successful, then
     reformulation to maximize crossing of the blood-brain barrier would have to
     be done prior to filing of an IND.  The Company believes that an IND could
     be filed within three years, although there can be no assurance to that
     effect.

          Parkinson's Disease Therapy

     The Company's interest in developing novel therapeutic agents for
     Parkinson's Disease continues.  However, based on recent insights into the
     structure-function relationship of the D1 receptor-dopamine interaction,
     the Company's emphasis has shifted toward the development of new molecules
     that have been designed to mimic dopamine's action on the D1 receptor.  The
     Company has entertained inquiries from potential corporate partners, and
     intends to pursue this R&D effort if a corporate partnership is secured,
     although no agreements in principal with any such partner have been
     reached.  In fact, there can be no assurances that a corporate partner will
     be secured or, if secured, that the partnership will be successful.

     CAPITAL INVESTMENT SINCE JANUARY 1, 1996

     Pursuant to Regulation D of the Securities Act of 1933, as amended (the
     "Act"), in January and February 1996, the Company sold, pursuant to certain
     subscription agreements, approximately 240 equity units (each, a "Unit")
     for net proceeds to the Company of approximately $20.8 million. Each Unit
     consists of (i) 1,000 shares of Series A Convertible Preferred Stock,
     stated value $100 per share (the "Preferred Stock"), and (ii) warrants to
     purchase 25,000 shares of Common Stock at $.6708 per share at any time over
     a ten-year period. The Preferred Stock is initially convertible at any time
     at the option of the holder into shares of the Company's Common Stock at a
     ratio of 175.3771 shares of Common Stock for each share of Preferred Stock.
     This initial conversion ratio is subject to adjustment in February 1997
     (the "Adjustment Date") if the fair market value on the Adjustment Date of
     the Company's Common Stock issuable upon conversion of one share of the
     Preferred Stock is less than $130.00.

     Pursuant to Regulation D of the Act, in June 1996, the Company sold,
     pursuant to certain subscription agreements, approximately 5,000,000 shares
     of Common Stock for net proceeds to the Company of approximately $5
     million, in part to respond to the recent discovery and desire to develop
     C-MAF.

     The proceeds from the Regulation D offers described above are expected to
     be sufficient to fund the Company's current development programs at their
     present levels of expenditure through 1997.

     NAME CHANGE

     The Company was incorporated in Delaware in 1972 under the name Greenwich
     Pharmaceuticals Incorporated ("Greenwich") and, effective June 15, 1995,
     changed its name to Boston Life Sciences, Inc.  Effective June 15, 1995,
     Old BLSI merged with and into Greenwich.  The Company's principal executive
     offices are now located at 33 Newbury Street, Suite 300, Boston,
     Massachusetts, and its telephone number at that location is (617) 425-0200.

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                                  RISK FACTORS

     In addition to the other information appearing elsewhere or incorporated by
     reference in this Prospectus, prospective investors should consider the
     following factors in evaluating the Company and its business before
     purchasing any of the Securities offered hereby.

     DEVELOPMENT STAGE

     Each of Old BLSI and Greenwich prior to the Merger had net operating losses
     since their respective inceptions.  Further, the Company has not generated
     revenues to date from product sales.  Currently, the Company is expected to
     incur substantial additional operating losses for the foreseeable future.
     The Company's ability to achieve profitability will depend, among other
     things, on a combination of one or more of the following factors:  the
     Company's ability to obtain significant additional financing; the Company's
     ability to obtain regulatory approvals for, and successfully complete the
     development and commercialization of, its product candidates, preclinical
     compounds and technologies; the time and cost of obtaining regulatory
     approvals for its products; the Company's ability to protect its
     proprietary rights, including its patent claims and the patent claims of
     its licensors and collaborators; the Company's licensors' and
     collaborators' ability to protect their patent claims; the Company's
     ability to enter into agreements for product development and
     commercialization; competing technological and market developments;
     manufacturing costs associated with its products and product candidates;
     and the costs of commercializing its products.  There can be no assurance
     that the Company will obtain required regulatory approvals, or successfully
     develop, manufacture and market its products or that the Company will
     achieve profitability.

     EARLY STAGE OF BLSI'S PRODUCTS; NO MARKETING EXPERIENCE

     None of the Company's product candidates, preclinical compounds and
     technologies have been approved for marketing by FDA or FDA's international
     equivalent.  The evaluation, research and development of any of the
     Company's product candidates, preclinical compounds or technologies
     requires further extensive laboratory and clinical testing prior to
     regulatory approval.  There can be no assurance that any of the Company's
     product development efforts will be successfully completed, that any
     required regulatory approvals will be obtained, that any such product
     candidates will be capable of being manufactured in commercial quantities
     at reasonable cost or that any new products, if introduced, will achieve
     market acceptance.  Also, there can be no assurance that the Company will
     not cease (i) all efforts to obtain approval of its technologies or (ii)
     the research and development of any of its current compounds in preclinical
     development.

     In addition, BLSI has had no experience in marketing pharmaceutical
     products.  In order to achieve commercial success for any product
     candidates, the Company will be required to either enter into arrangements
     with third parties with respect to the marketing of the Company's products
     or develop such marketing experience internally.  There can be no assurance
     that the Company will be able to enter into marketing agreements with
     others on acceptable terms, if at all, or that it will successfully develop
     such experience.

     DEPENDENCE UPON HARVARD AND ITS AFFILIATES

     BLSI currently conducts a substantial portion of its research and
     development through Harvard and its Affiliates pursuant to sponsored
     research agreements.  Virtually all of BLSI's current technologies under
     development were invented or discovered by researchers working for Harvard
     and its Affiliates (the "BLSI Technologies").  A substantial portion of the
     Company's business is thus dependent upon (i) the continuing research and
     development performed by Harvard and its Affiliates pursuant to sponsored
     research agreements with BLSI relating to BLSI's technologies, and (ii) the
     licenses granted to BLSI with respect to the BLSI Technologies by, or the
     licenses that it is seeking to acquire from, Harvard Medical School,
     Harvard School of Public Health and The Children's Medical Center
     Corporation.  As a result of such dependence, the success of the Company
     depends, in large part, upon its maintaining its sponsored research
     agreements with Harvard and its Affiliates.  There can be no assurances
     that the Company will be successful in this regard or that Harvard and its
     Affiliates will continue to provide access to their resources.

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     There can be no assurance that any research performed by Harvard and its
     Affiliates and sponsored by the Company will ever result in any proprietary
     technology which is patentable by Harvard and its Affiliates or that any
     issued patents will provide the Company with any competitive advantages or
     will not be successfully challenged by any third parties.  Moreover, the
     Company will not own licenses to all of the Company's technologies.  There
     can be no assurance that the Company will be able to obtain any required
     licenses or that any patent applications which are the subject of such
     licenses will result in the issuance of any patents.

     RELIANCE UPON FUTURE COLLABORATIONS; CERTAIN PRIOR RELATIONSHIPS

     The Company expects its strategy for the development, clinical testing,
     manufacturing and commercializing of its product candidates, preclinical
     compounds and technologies will include entering into various
     collaborations with corporate partners, joint venturers, licensors, sub-
     licensees and others.  There can be no assurance that the Company will be
     able to negotiate any such collaborative arrangements on acceptable terms,
     if at all, that such arrangements will be successful or that the Company
     will realize any revenues pursuant to such arrangements.  Even if the
     Company is able to negotiate collaborative arrangements on acceptable
     terms, there can be no assurance that such collaborations will be
     completed, will be successful or that disputes will not arise with respect
     to the ownership rights to any technology which may be developed pursuant
     to such collaborations.

     In the event that the Company enters into collaborative arrangements, the
     amount and timing of resources which the other parties to such
     collaborations devote to these activities will not necessarily be within
     the control of the Company.  There can be no assurance that such parties
     will perform their obligations as expected.   If any of the Company's
     collaborators breaches or terminates its agreement with the Company or
     otherwise fails to conduct its collaborative activities in a timely manner,
     the development or commercialization of the product candidate or technology
     subject to such collaboration agreement may be delayed, and the Company may
     be required to undertake unforeseen additional responsibilities or to
     devote unforeseen additional resources to such development or
     commercialization, or such development or commercialization could be
     terminated.  The termination or cancellation of collaborative arrangements
     could also adversely affect the Company's financial condition, intellectual
     property position and operations.

     In addition, the Company expects to rely on third parties to manufacture
     its product candidates.  There can be no assurance that the Company will be
     able to contract with manufacturers that meet the Company's requirements
     for quality, quantity and timeliness, or that the Company would be able to
     find substitute manufacturers, if necessary.  Such inability to contract
     for manufacturing capabilities on acceptable terms may adversely affect the
     Company's ability to conduct preclinical and clinical testing and may
     result in delays in obtaining regulatory approvals, which also may
     adversely affect the Company.  In addition, the manufacture by the Company
     of its products on a commercial scale will require significant start-up
     expenses and expansion of facilities and personnel, and no assurance can be
     given that the Company can develop such manufacturing capability or hire
     and train qualified personnel.

     To the extent that the Company is not able to establish collaborative
     arrangements, it will face increased capital requirements to undertake
     research and development activities at its own expense and may encounter
     significant delays in introducing its products into certain markets or find
     that the development, manufacture or sale of its products in such markets
     is adversely affected by the absence of such collaborative arrangements.

     UNCERTAINTY REGARDING PATENTS AND PROPRIETARY RIGHTS

     Even though patent protection will be sought for proprietary technologies
     either by the Company, its collaborators or the inventors or owners of such
     technologies which are subject to licenses granted to the Company, the
     patent application and issuance process can be expected to take several
     years and may entail considerable expense without any assurance that any
     patent will issue.  The Company's ability to obtain protection for any of
     its product candidates, preclinical compounds and technologies could be
     delayed or adversely affected if the United States Patent and Trademark
     Office (the "USPTO") requires clinical data demonstrating efficacy of
     potential therapeutic agents.  The failure to obtain patent protection on
     the Company's product candidates, preclinical compounds and unpatented
     technologies may have a material adverse effect on the Company's
     competitive position and business prospects.  Further, even if patents can
     be obtained, there can be no assurance that any such patents will provide
     the Company with any competitive advantage, that others will not
     independently develop similar technologies or products or

                                       8
<PAGE>
 
     duplicate any technology developed by or on behalf of the Company or, if
     patents are issued, design around the patented aspects of any technology or
     products developed by or on behalf of the Company, or that any such patent
     will not be successfully challenged by a third party.  It is also possible
     that patented technologies or products of the Company or its licensors or
     collaborators may infringe on patents or other rights owned by others,
     licenses to which may not be available to the Company.  The Company may
     have to alter its products or processes, pay licensing fees or cease
     certain activities altogether because of patent rights of third parties,
     thereby causing additional unexpected costs and delays to the Company.

     Patent law relating to the scope of claims in the fields of healthcare and
     biosciences is still evolving, and the Company's patent rights will be
     subject to this uncertainty.  The Company's patent rights on its products
     therefore might conflict with the patent rights of others, whether existing
     now or in the future.  For the same reasons, the products of others could
     infringe the patent rights of the Company.  The defense and prosecution of
     patent claims is both costly and time-consuming, even if the outcome is
     favorable to the Company.  The failure of any existing or future patents
     owned by or licensed to the Company or its collaborators to provide the
     Company protection against competitors, including without limitation,
     protection against a claim of patent infringement, could subject the
     Company to significant liabilities to third parties, require disputed
     rights to be licensed from third parties, require the Company to alter its
     products or processes or require the Company to cease selling its products.

     The Company relies on trade secrets and proprietary know-how, which it
     seeks, and will continue to seek, to protect in part by confidentiality
     agreements with its collaborators, employees and consultants.  There can
     be no assurance that these agreements will not be breached, that the
     Company will have adequate remedies for any such breach or that the
     Company's trade secrets will not otherwise become known or be independently
     developed by competitors.

     To the extent that consultants, key employees or other third parties apply
     technological information independently developed by them or by others to
     the Company's product candidates, preclinical compounds or technologies,
     disputes may arise as to the proprietary rights to such information which
     may not be resolved in favor of the Company.  The Company's scientific
     advisors and other consultants are each employed by, and may have
     consulting agreements with, third parties and any inventions discovered by
     such individuals are not likely to become property of the Company.

     POTENTIAL NEED FOR ADDITIONAL KEY PERSONNEL

     Should the Company determine to undertake the research and development of
     any of the product candidates or preclinical compounds, such research and
     development and the resultant preclinical and clinical testing of its
     various product candidates and preclinical compounds, the governmental
     approval process and the marketing of its product candidates may require
     the addition of key management and scientific personnel, in addition to
     those limited numbers of persons currently employed by the Company, in
     areas such as research and development, preclinical testing, clinical
     investigation, regulatory affairs, financial reporting, manufacturing and,
     to the extent applicable, marketing and product sales.  The failure of the
     Company to attract, or to gain access to, such personnel could have a
     material adverse effect on the Company's ability to develop such product
     candidates, preclinical compounds and technologies.  The Company will face
     intense competition for such personnel from other companies, research and
     academic institutions, government entities and other organizations.  There
     can be no assurance that the Company will be successful in hiring,
     retaining or otherwise gaining access to the personnel required for such
     activities.

     POTENTIAL DIFFICULTY IN OBTAINING FDA AND OTHER GOVERNMENTAL APPROVALS

     The Company's products and its manufacturing and research activities will
     be subject to varying degrees of regulation by a number of government
     authorities in the United States and other countries, including FDA
     pursuant to the Federal Food, Drug and Cosmetic Act.  FDA regulates
     pharmaceutical products, including their manufacture and labeling.  Prior
     to marketing, any product developed by the Company must undergo an
     extensive regulatory approval process, which includes preclinical and
     clinical testing of such product to demonstrate its safety and efficacy.
     This regulatory process can require many years and the expenditure of
     substantial resources.  Data obtained from preclinical and clinical trials
     are subject to varying interpretations, which can delay, limit or prevent
     FDA approval.  See "Risk Factors -- Development Stage."

                                       9
<PAGE>
 
     None of the Company's product candidates, preclinical compounds and
     technologies have been approved for marketing by FDA or FDA's international
     equivalent.  The Company cannot accurately predict all relevant regulatory
     requirements or issues.  Changes in existing laws, regulations, policies or
     interpretations of prior events could prevent the Company or its licensees,
     licensors or collaborators from, or could affect the timing of, achieving
     compliance with regulatory requirements, including obtaining current and
     future regulatory clearances, where necessary.  Federal and state laws,
     regulations and policies are always subject to change, with possible
     retroactive effect, and depend heavily on administrative policies and
     interpretations.  There can be no assurance that any changes with respect
     to Federal and state laws, regulations and policies, and, particularly,
     with respect to FDA and other such regulatory bodies, will not have a
     material adverse effect on the Company.

     The process of obtaining FDA clearances can be time-consuming and
     expensive, and there is no assurance that such clearances will be granted
     or that the FDA review process will not involve delays that materially and
     adversely affect the testing, marketing and sale of the Company's products.
     Similar delays may be encountered in foreign countries.  Moreover,
     regulatory clearances for new products, even if granted, may include
     significant limitations on the uses for which such products may be
     marketed.  In addition, even if regulatory approval is obtained, any
     marketed product and its manufacturer are subject to continual review and
     any discovery of previously unrecognized problems with a product or
     manufacturer could result in suspension or limitation of approvals.  There
     can be no assurance that any clearances that are required, once obtained,
     will not be withdrawn or that compliance with other regulatory requirements
     can be maintained, to the degree that the Company may have already
     complied.

     LIMITED PUBLIC MARKET FOR COMMON STOCK; POSSIBLE VOLATILITY OF PRICES, NO
     DIVIDENDS

     Historically, the Common Stock has experienced low trading volumes.  The
     market price of the Common Stock also has been highly volatile and it may
     continue to be highly volatile as has been the case with the securities of
     other public biotechnology companies. Factors such as announcements by the
     Company or its competitors concerning technological innovations, results of
     clinical trials, new commercial products or procedures, proposed government
     regulations and developments of disputes relating to patents or proprietary
     rights may have a significant effect on the market price of the Securities.
     The securities markets have experienced volatility that particularly
     affects prices of equity securities of biotechnology companies and which
     often is unrelated to the performance of such companies. Thus, changes in
     the market price of the Common Stock may bear no relation to the Company's
     actual operations or financial results. The Company does not expect to pay
     any dividends on its capital stock for the foreseeable future.

     OUTSTANDING OPTIONS AND WARRANTS

     As of July 22, 1996, the Company had granted stock options and warrants to
     purchase approximately 20.5 million shares of its Common Stock at exercise
     prices ranging from $.01 - $1.10 per share.  Many of these previously
     granted options and warrants were issued at exercise prices below the
     exercise price of the Warrants.  To the extent that such previously issued
     outstanding stock options and warrants are exercised, dilution to the
     percentage interest of the Company's stockholders will occur.  Moreover,
     the terms upon which the Company would be able to obtain additional equity
     capital may be affected adversely since the holders of such outstanding
     options and warrants can be expected to exercise them at a time when the
     Company would, in all likelihood, be able to obtain any needed capital on
     terms more favorable to the Company than those provided in the outstanding
     options and warrants.

     TECHNOLOGICAL CHANGE AND COMPETITION

     The Company operates in rapidly evolving fields.  Competition from larger,
     more experienced and better capitalized companies will be intense.  There
     can be no assurance that developments by others will not render the
     Company's product candidates, preclinical compounds or technologies
     obsolete or noncompetitive or that the Company will be able to keep pace
     with any new technological developments.  In addition, if the Company
     commences sales of products, manufacturing efficiency and marketing
     capabilities are likely to be significant competitive factors.  The Company
     has no sales force or marketing experience.  In addition, many of the
     Company's competitors and potential competitors have substantially greater
     capital resources, manufacturing experience, research and development
     staffs and production facilities than the Company.  Many of these
     competitors also may have

                                       10
<PAGE>
 
     significantly greater experience than the Company in undertaking
     preclinical and clinical testing of new pharmaceutical products and
     obtaining FDA and other regulatory approvals of products for use in health
     care.

     A substantial number of patents have been applied for by and issued to
     other pharmaceutical and biotechnology companies, and other companies may
     have filed applications for patents, may have been issued patents or may
     have obtained additional patents and proprietary rights relating to
     products or processes competitive with those of the Company.  Patent
     applications in the United States are maintained in secrecy until patents
     based thereon issue, and since publication of discoveries in the scientific
     or patent literature often lags behind actual discoveries, the Company
     cannot be certain that it or any of its licensors or collaborators were the
     first creator of inventions covered by pending patent applications or that
     it or any of such licensors or collaborators were the first to file patent
     applications for such inventions.  Consequently, there can be no assurance
     that existing patents of the Company or any patents that may be issued to
     the Company or its licensors or collaborators in the future will provide
     protection against competitive products or otherwise be commercially
     valuable.

     UNCERTAINTY OF PHARMACEUTICAL PRICING AND RELATED MATTERS; UNCERTAIN
     AVAILABILITY OF HEALTH CARE REIMBURSEMENT

     The Company's business may be materially adversely affected by the
     continuing efforts of government and third-party payors to contain or
     reduce the costs of health care through various means.  For example, in
     certain foreign markets, pricing or profitability of prescription
     pharmaceuticals is subject to government control.  In the United States,
     there have been a number of federal and state proposals to implement
     similar government control.  Over the last two years, a number of bills
     proposing comprehensive health care reform have been introduced in
     Congress.  In general, such proposals are designed to reform the health
     care system to, among other things, (i) control or reduce public and
     private spending on health care, (ii) provide for uniform health insurance
     benefits packages and administrative efficiency in the health care system,
     and (iii) provide universal access to health care within the next several
     years.  Some of the proposals introduced in Congress call for a pricing
     regulatory oversight board (sometimes referred to as the Breakthrough Drug
     Pricing Committee) which may have input and/or place caps or limitations on
     pharmaceutical prices, and potential mandatory or voluntary pharmaceutical
     product rebate policies.  Such proposals, if adopted, could decrease the
     price that the Company receives for any products it may sell in the future.
     There can be no assurance that such initiatives or proposals, if adopted,
     will not have an adverse effect upon the Company.  In addition, there have
     been a number of federal and state proposals to subject the pricing of
     health care products and services to government control.  It is uncertain
     what legislative proposals will be adopted, if any, or what actions
     federal, state or private payors for health care goods and services may
     take in response to any health care reforms and no assurance can be given
     that any such reforms will not have a material adverse effect on the
     Company.  To the extent that such proposals or reforms have a material
     adverse effect on the business, financial condition and profitability of
     other pharmaceutical companies that are prospective collaborators for
     certain of the Company's product candidates, the Company's ability to
     commercialize its product candidates may be adversely affected.

     The Company's ability to commercialize pharmaceutical products may depend
     in part on the extent to which reimbursement for the costs of such products
     and related treatments will be available from government health
     administration authorities, private health insurers and others.
     Significant uncertainty exists as to the reimbursement status of newly
     approved health care products, and third-party payors are increasingly
     challenging the prices charged for medical products and services.  There
     can be no assurance that adequate third-party insurance coverage will be
     available to patients to allow the Company to establish and maintain price
     levels sufficient for realization of an appropriate return on its
     investment in developing its product candidates.  If adequate coverage and
     reimbursement levels are not provided by government and third-party payors
     for use of the Company's products, the market acceptance of these products
     will be adversely affected.  In addition, many health maintenance
     organizations and other managed care companies are seeking to negotiate
     substantial volume discounts for the sale of pharmaceutical products to
     their members thereby reducing profit margins for manufacturers, and
     competitive pressures are inducing many manufacturers to accept such
     discount arrangements.

     STATUS OF LITIGATION

     Greenwich was served with five complaints during 1992, which complaints
     were subsequently consolidated and granted class action status, alleging
     violations of the Federal securities laws and common law.  On April 12,
     1995,

                                       11
<PAGE>
 
     the Court entered a Final Judgment and Order of Dismissal pursuant to Rule
     23(e) of the Federal Rules of Civil Procedure approving the Class Action
     Settlement and on April 25, 1995 the Court of Chancery of the State of
     Delaware for New Castle County entered an Order and Final Judgment pursuant
     to Rule 23.1 of the Rules of the Court of Chancery approving the Derivative
     Action Settlement. During the 30-day period following such court orders,
     appeals of the settlements are permitted.  No appeals were accepted and the
     orders approving the Class Action Settlement and the Derivative Action
     Settlement are final.

     POTENTIAL PRODUCT LIABILITY CLAIMS

     The use of the Company's product candidates in clinical trials and the sale
     of any resulting products may expose the Company to liability claims
     resulting from the use of such candidates or products.  These claims might
     be made directly by consumers or by pharmaceutical companies or other
     sellers of such products.  While the Company currently has product
     liability insurance, there can be no assurance that such insurance will be
     sufficient to satisfy any liabilities that may arise for the Company.
     Moreover, such coverage is becoming increasingly expensive and difficult to
     obtain.  The existing coverage will not be adequate as the Company's
     product development activities progress.  There can be no assurance that
     adequate insurance coverage will be available to the Company in the future
     at an acceptable cost, if at all.  An inability to obtain sufficient
     insurance coverage at an acceptable cost or otherwise to protect against
     potential product liability claims could prevent or limit the
     commercialization of any products by the Company.  In addition, there can
     be no assurance that any product liability claims will not materially and
     adversely affect the business or financial condition of the Company.

                                       12
<PAGE>
 
                                USE OF PROCEEDS

     The net proceeds from the sale of the Securities will be received by the
     Selling Stockholders.  The Company will not receive any proceeds from the
     sale of the Securities by the Selling Stockholders.


                              SELLING STOCKHOLDERS

     The table below sets forth certain information regarding ownership of the
     Company's Common Stock and Warrants by the Selling Stockholders on July 22,
     1996 and the number of Securities to be sold by them under this Prospectus.
     The Securities include 23,991.01 shares of Common Stock which were issued
     or are issuable upon the conversion of outstanding Preferred Stock
     owned by certain of the Selling Stockholders and 1,147,044 shares of Common
     Stock which were issued or are issuable upon the exercise of Warrants owned
     by the Selling Stockholders, which Preferred Stock and Warrants were
     acquired by certain of the Selling Stockholders in one or more private
     placements by the Company.

     In recognition of the fact that investors may wish to be legally permitted
     to sell their Securities when they deem appropriate, the Company has filed
     with the Commission, under the Securities Act, a Registration Statement on
     Form S-3, of which this Prospectus forms a part, with respect to the resale
     of the Securities from time to time on the Nasdaq SmallCap Market or in
     privately-negotiated transactions and has agreed to prepare and file such
     amendments and supplements to the Registration Statement as may be
     necessary to keep the Registration Statement effective until the Securities
     are no longer required to be registered for the sale thereof by the Selling
     Stockholders.

<TABLE>
<CAPTION>
                                                                      Securities Owned Prior                                 
                                                                         to Offering (1)(2)                                   
                             ------------------------------------------------------------------------------------  
                                                                                    Shares of                    
                                                 Shares of                            Common                     
                               Shares of          Common                              Stock            Warrants  
Name of Selling                 Common             Stock           Number of        Underlying         Offered   
 Shareholder                     Stock         Offered Hereby      Warrants          Warrants           Hereby   
- ---------------                ---------       --------------      ---------        ----------         --------  
                                                                                                                 
<S>                          <C>               <C>              <C>               <C>               <C>          
Los Angeles City                2,000,000         2,000,000                  0                0                 0
Employees' Retirement                                                                                            
 System                                                                                                          
Lindsay A. Rosenwald            3,125,546         1,173,474          2,256,161        2,256,161           167,278
Fiduciary Trust Co. Int'l       1,075,000         1,075,000                  0                0                 0
Michael Jesselson                 750,000           750,000                  0                0                 0
Fiduciary Trust Global            675,000           675,000                  0                0                 0
 Fund                                                                                                            
Peter M. Kash                     605,830           544,300            401,156          401,156            77,590
Allen Stahler                     484,479           484,479             69,062           69,062            69,062
Nathan Low                        200,763           200,763            272,549          272,549                 0
John Gallager                     178,022           178,022            219,780          219,780                 0
Richard Stone                     294,505           294,505             54,945           54,945                 0
Wayne L. Rubin                    289,263           289,263             78,077           78,077            41,234
Michael S. Weiss                  280,603           280,603            232,397          232,397            40,000
Martin Kratchman                  229,661           229,661            103,338          103,338            32,738
Strome Susskind                   186,421           186,421             26,859           26,859            26,859
Pharos Fund Ltd                   200,000           200,000                  0                0                 0
</TABLE>

<TABLE> 
<CAPTION>                                                                                                      
                                         Securities Owned After Offering (3)                                     
                             ----------------------------------------------------------
                               Number of      Percent of                                                       
Name of Selling                Shares of        Common        Number of      Percent of                        
 Shareholder                  Common Stock      Stock          Warrants       Warrants                         
- ---------------              -------------    ----------      ---------      ----------                         
                                                                                                               
<S>                          <C>               <C>          <C>               <C>                              
Los Angeles City                        0           *                   0          *                           
Employees' Retirement                                                                                          
 System                                                                                                        
Lindsay A. Rosenwald            1,952,072          1.8%         2,088,883        22.2%                         
Fiduciary Trust Co. Int'l               0           *                   0          *                           
Michael Jesselson                       0           *                   0          *                           
Fiduciary Trust Global                  0           *                   0          *                           
 Fund                                                                                                          
Peter M. Kash                      61,530           *             323,566         2.1%                         
Allen Stahler                           0           *                   0          *                           
Nathan Low                              0           *                   0          *                           
John Gallager                           0           *                   0          *                           
Richard Stone                           0           *                   0          *                           
Wayne L. Rubin                          0           *              36,843          *                           
Michael S. Weiss                        0           *             192,397         1.8%                         
Martin Kratchman                        0           *              70,600          *                           
Strome Susskind                         0           *                   0          *                           
Pharos Fund Ltd                         0           *                   0          *                           
</TABLE> 

                                      13
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                         Securities Owned Prior                                                  
                                                           to Offering (1)(2)                                                    
                        ----------------------------------------------------------------------------------
                                                                                                          
                                                                             Shares of                    
Name of Selling                              Shares of                      Common Stock                    
 Shareholder             Shares of          Common Stock      Number of      Underlying       Warrants       
                        Common Stock       Offered Hereby      Warrants       Warrants     Offered Hereby    
- ---------------         --------------     --------------    -----------    ------------   --------------      
                                                                                                                   
<S>                     <C>                <C>               <C>            <C>            <C>                
Kenmar Gems                   174,500        174,500             24,875          24,875            24,875  
Scott Katzmann                450,372        154,901            379,915         379,915            22,081 
Marck Abeshouse               146,255        146,255             37,792          37,792            20,848 
Timothy McInerney             217,974        132,190            186,305         186,305            18,843 
Joseph Edelman                101,480        101,480             14,466          14,466            14,466 
Bernard Gross                  68,572         68,572              9,775           9,775             9,775 
Jeffrey Levine                 68,397         68,397              9,750           9,750             9,750 
Karl Ruggeberg                 54,016         54,016              7,700           7,700             7,700 
Erinch Ozada                   50,000         50,000                  0               0                 0 
Preston Tsao                   37,088         37,088                  0               0                 0 
Joseph Rudick                  38,563         24,552             19,805          19,805             3,500 
GKN Securities                 23,675         23,675              3,375           3,375             3,375 
Joseph Merback                 21,045         21,045              3,000           3,000             3,000 
T.R. Ulie & Associates         13,153         13,153              1,875           1,875             1,875 
Stephen McDermott              10,961         10,961              1,562           1,562             1,562 
Alan Swerdloff                 12,363         12,363                  0               0                 0 
Ian K. Sugarman                 9,645          9,645              3,375           3,375             1,375 
Lauren S. Youner                8,660          8,660              4,234           4,234             1,234 
Blair, Foster                   5,261          5,261                750             750               750 
HARE & Co.                      921(3)         921(3)               0(3)            0(3)              0(3)
- ------------------------- 
<CAPTION> 
                                         Securities Owned
                                         After Offering(3)
                       --------------------------------------------------- 
                            
                       Number of     
Name of Selling        Shares of    Percent of 
 Shareholder            Common        Common        Number of   Percent of
                        Stock         Stock         Warrants    Warrants
- ---------------        ----------     ----------    ---------   ----------
                            
<S>                    <C>            <C>           <C>         <C> 
Kenmar Gems                     0              *            0            *
Scott Katzmann            295,471              *      357,834         3.8%
Marck Abeshouse                 0              *       16,944            *
Timothy McInerney          85,784              *      167,462         1.8%
Joseph Edelman                  0              *            0            *
Bernard Gross                   0              *            0            *
Jeffrey Levine                  0              *            0            *
Karl Ruggeberg                  0              *            0            *
Erinch Ozada                    0              *            0            *
Preston Tsao                    0              *            0            *
Joseph Rudick              14,011              *       16,305            *
GKN Securities                  0              *            0            *
Joseph Merback                  0              *            0            *
T.R. Ulie & Associates          0              *            0            *
Stephen McDermott               0              *            0            *
Alan Swerdloff                  0              *            0            *
Ian K. Sugarman                 0              *        2,000            *
Lauren S. Youner                0              *        3,000            *
Blair, Foster                   0              *            0            *
HARE & Co.                      0              *            0            *
- ------------------------ 
</TABLE>                                          
                                                  
*    Less than one percent.                       
                                                  
(1)  Assumes the conversion of all outstanding Preferred Stock and the
     exercise of all outstanding Warrants owned by the Selling Stockholders.

(2)  Based on shares of Common Stock outstanding as of July 22, 1996 and
     includes 23,991.01 shares of Common Stock which were issued or are issuable
     upon the conversion of outstanding Preferred Stock owned by certain of
     the Selling Stockholders and 1,147,044 shares of Common Stock which were
     issued or are issuable upon the exercise of outstanding Warrants owned by
     certain of the Selling Stockholders.

(3)  Assumes the sale of all of the securities registered pursuant to the
     Company's Registration Statement on Form S-3 filed with the Commission on
     May 10, 1996 (Registration No. 333-2730).

                                       14
<PAGE>
 
                              PLAN OF DISTRIBUTION

     The Securities offered hereby by the Selling Stockholders may be sold from
     time to time by any such Selling Stockholder, or by pledgees, donees,
     transferees or other successors in interest.  Such sales may be made on one
     or more exchanges or in the over-the-counter market (including the Nasdaq
     SmallCap Market), or otherwise at prices and at terms then prevailing or at
     prices related to the then-current market price, or in negotiated
     transactions.  The Securities may be sold by one or more of the following
     methods, including, without limitation:  (a) a block trade in which the
     broker-dealer so engaged will attempt to sell the Securities as agent but
     may position and resell a portion of the block as principal to facilitate
     the transaction; (b) purchases by a broker or dealer as principal and
     resale by such broker or dealer for its account pursuant to this
     Prospectus; (c) ordinary brokerage transactions and transactions in which
     the broker solicits purchasers; and (d) face-to-face transactions between
     the Selling Stockholders and purchasers without a broker-dealer.  In
     effecting sales, brokers or dealers engaged by the Selling Stockholders may
     arrange for other brokers or dealers to participate.  Such brokers or
     dealers may receive commissions or discounts from the Selling Stockholders
     in amounts to be negotiated immediately prior to the sale.  Such brokers or
     dealers and any other participating brokers or dealers may be deemed to be
     "underwriters" within the meaning of the Securities Act, in connection with
     such sales.  In addition, any securities covered by this Prospectus that
     qualify for sale pursuant to Rule 144 under the Securities Act might be
     sold under Rule 144 rather than pursuant to this Prospectus.

     Upon the Company being notified by any Selling Shareholder that a material
     arrangement has been entered into with a broker or dealer for the sale of
     shares through a block trade, special offering, exchange distribution or
     secondary distribution or a purchase by a broker or dealer, a supplemented
     Prospectus will be filed, if required, pursuant to Rule 424(c) under the
     Securities Act, disclosing (a) the name of each such broker-dealer, (b) the
     number of shares involved, (c) the price at which such shares were sold,
     (d) the commissions paid or discounts or concessions allowed to such
     broker-dealer(s), which applicable, (e) that such broker-dealer(s) did not
     conduct any investigation to verify the information set out or incorporated
     by reference in this Prospectus, as supplemented, and (f) other facts
     material to the transaction.

     The Company is bearing all costs relating to the registration of Securities
     (other than fees and expenses, if any, of counsel or other advisers to the
     Selling Stockholders).  Any commissions, discounts or other fees payable to
     broker-dealers in connection with any sale of the Securities will be borne
     by the Selling Stockholders selling such Securities.

     The Company has agreed to indemnify the Selling Stockholders in certain
     circumstances against certain liabilities, including liabilities arising
     under the Securities Act.  Each Selling Stockholder has agreed to indemnify
     the Company, its directors and its officers who sign the Registration
     Statement against certain liabilities, including liabilities arising under
     the Securities Act.

                                       15
<PAGE>
 
                   DESCRIPTION OF SECURITIES TO BE REGISTERED

     Common Stock

     The description of the Company's Common Stock is contained in the Company's
     Registration Statement on Form 8-A filed under the Exchange Act, including
     any amendment or reports filed for the purpose of updating such
     description, and is incorporated herein by reference.

     Warrants

           Exercise Price and Terms

     Each Warrant entitles the holder thereof to purchase one share of Common
     Stock at an exercise price of $.6708.  Warrants have been issued subject to
     adjustment in accordance with the adjustment provisions referred to below.
     The Warrants may be exercised upon surrender of the Warrant certificate on
     or prior to February 28, 2006 (or, if redeemed prior thereto, the date
     immediately preceding the redemption date) at the offices of Continental
     Stock Transfer & Trust Company (the "Warrant Agent"), with the subscription
     form on the reverse side of the Warrant certificate completed as indicated,
     accompanied by payment of the full exercise price (by cashier's or
     certified check payable to the order of the Warrant Agent, or by wire
     transfer) for the number of Warrants being exercised.  No fractional shares
     will be issued upon exercise of the Warrants, and the Company will pay cash
     in lieu of fractional shares.  After February 28, 2006, Warrants will
     become void and of no value.

           Adjustments

     The exercise price and the number of shares of Common Stock purchasable
     upon the exercise of the Warrants are subject to adjustments upon the
     occurrence of certain events, such as stock dividends or stock splits of
     the Common Stock.  Additionally, an adjustment would be made in the case of
     the reclassification or exchange of the Common Stock, consolidation or
     merger of the Company with or into another corporation or sale of all or
     substantially all of the assets of the Company, in order to enable Warrant
     holders to acquire the kind and number of shares of Common Stock that might
     otherwise have been purchased upon the exercise of the Warrant.  No
     adjustment to the exercise price of the shares subject to the Warrants will
     be made for dividends (other than dividends in the form of stock), if any,
     paid on the Common Stock.

           Redemption

     The Warrants are subject to redemption by the Company at $.10 per share for
     each share subject to each Warrant on 60 days prior written notice provided
     that the closing bid quotation for the Common Stock as reported on the
     Nasdaq SmallCap Market, or on such exchange on which the Common Stock is
     then traded, exceeds 200% of the exercise price per share for 20
     consecutive trading days ending three days prior to the date of redemption.
     The Warrants are not redeemable on or prior to February 28, 2006.

                                       16
<PAGE>
 
           Warrant Holder Not a Stockholder

     The Warrants do not confer upon holders thereof any voting or other rights
     of a stockholder of the Company.  The shares of Common Stock issuable upon
     exercise of the Warrants in accordance with the terms thereof will be fully
     paid and nonassessable.

           Transfer and Warrant Agent

     The Transfer and Warrant Agent for the Common Stock and the Warrants is
     Continental Stock Transfer & Trust Company, 2 Broadway, New York, New York
     10004.


                                 LEGAL OPINION

     The validity of the shares of Common Stock offered hereby will be passed
     upon for the Company by Ballard Spahr Andrews & Ingersoll, Philadelphia,
     Pennsylvania.


                                    EXPERTS

     The Consolidated Financial Statements of Greenwich and its subsidiary,
     Greenwich Pharmaceuticals International Incorporated, as of December 31,
     1994 and 1993 and for each of the three years in the period ended December
     31, 1994 incorporated by reference in this Prospectus, have been audited by
     Arthur Andersen LLP, independent public accountants, as indicated in their
     report with respect thereto, and is included herein in reliance upon the
     authority of said firm as experts in giving said reports.  Reference is
     made to said report which contains an explanatory paragraph relating to
     Greenwich's ability to continue as a going concern as discussed in Note 1
     to the consolidated financial statements incorporated herein.  Arthur
     Andersen LLP did not audit the financial statements of Greenwich for the
     period from inception to December 31, 1988.  Such statements are included
     in from inception to December 31, 1994 totals.  The statements of
     operations, stockholders' equity and cash flows of Greenwich for the period
     from inception (February 1969) to December 31, 1988 (not presented or
     incorporated by reference separately herein) have been audited by Deloitte
     & Touche LLP, independent auditors, as stated in their report, which is
     incorporated herein by reference and has been so incorporated in reliance
     upon the report of such firm given upon their authority as experts in
     accounting and auditing.  Such report includes an explanatory paragraph
     that states that the ultimate success of Greenwich's development program is
     dependent upon future events, the outcome of which is currently
     undeterminable, and is also dependent upon obtaining additional financing
     adequate to fulfill its development activities and achieving a level of
     revenues adequate to support Greenwich's cost structure.

     The consolidated financial statements of the Company as of December 31,
     1995 and 1994, for the three years ended December 31, 1995, and for the
     period from inception (October 16, 1992) through December 31, 1995,
     incorporated by reference in this Prospectus from the Annual Report on Form
     10-K, as amended by Form 10-K/A, for the year ended December 31, 1995, have
     been so included in reliance on the report of Price Waterhouse LLP,
     independent accountants, given on the authority of said firm as experts in
     auditing and accounting.

                                       17
<PAGE>
 
================================================================================

     No dealer, salesperson or any other individual has been authorized to give 
any information or to make any representations not contained in this Prospectus
in connection with the offer covered by this Prospectus. If given or made, such
information or representations must not be relied upon as having been authorized
by the Company or the Selling Stockholders. This Prospectus does not constitute
an offer to sell, or a solicitation of an offer to buy, any of these securities
in any jurisdiction where, or to any person whom, it is unlawful to make such
offer or solicitation. Neither the delivery of this Prospectus nor any offer or
sale made hereunder shall, under any circumstances, create any implication that
there has been no change in the affairs of the Company or that the information
contained herein is correct as of any time subsequent to the date hereof.
                                                    

                                                    
                      TABLE OF CONTENTS
                      -----------------    
                                                    
                                                     PAGE 
                                                     ----               
Available Information                                  2
Incorporation of Certain                            
 Documents by Reference                                2 
The Company                                            4
Risk Factors                                           7
Use of Proceeds                                       13 
Selling Stockholders                                  13
Plan of Distribution                                  15
Description of Securities                             
 to be Registered                                     16
Legal Opinion                                         17
Experts                                               17
                                                    
               ______________________                              
                                                    
                                                    
                                                    
                                                    
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                           10,826,170 Shares        
                           
                           
                            
                       BOSTON LIFE SCIENCES, INC.
                           


                                   




                              Common Stock
                                           
                                Warrants  




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

                               PROSPECTUS     

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












                             August 15, 1996     


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