FOR IMMEDIATE RELEASE

October 14, 2005.

Prous Science selects ChemAxon to extend online knowledge mining functionality..

October 14th, 2005. Budapest, Hungary, and Barcelona, Spain: ChemAxon, a software solutions provider for life sciences, today announced agreement with Prous Science for the provision of ChemAxon's JChem Cartridge cheminformatics suite and Marvin, its Java-based structure editor and viewer, for Prous Science web-based content products. The agreement outlines the use of ChemAxon software initially within the Prous Science Integrity® drug discovery and development portal.

Arriving in 2000, ChemAxon's JChem suite has quickly become a leading cheminformatics platform development toolkit enabling powerful searching of mixed structural and nonstructural data. Based entirely in Java, the suite is platform-independent, and for Marvin, the structure editor and viewer element, means straightforward browser-based operation for online interaction and delivery.

As a resource for empowering drug R&D activities and following the progress of new chemical entities through the discovery and development
pipeline, Prous Science Integrity® reflects trends in pharmaceutical and biotech research during the last 25 years. Integrity®'s more than
220,000 compounds offer comprehensive coverage of the most significant discoveries in modern medicinal chemistry and biology as related to drugs and therapeutics, along with a range of powerful tools to search, filter and find relationships within the extensive content available.
Along with basic product information, Integrity® offers a wide array of complementary data on experimental pharmacology, pharmacokinetics,
organic synthesis and targets, among other fields, allowing investigators to originate new hypotheses in the discovery and
development of better and safer drugs. Since its introduction in 2001, Integrity® has been adopted by major pharmaceutical and biotechnology companies worldwide and by academic and health-care institutions to drive knowledge creation, target mission-critical milestones, and support strategic decisions in drug R&D.

The addition of the JChem suite functionality to the Integrity® portal, now available, offers users new options for structure searching. The
integration of Marvin allows users to build complex, structure-based queries directly from their browser window without the need for special
plugins or user native software.

Dr. Ferenc Csizmadia, CEO of ChemAxon, said, "We are happy to be working with Prous Science, particularly in the area of knowledge-driven discovery. It's a good fit." "The addition of the JChem suite provides enhanced chemistry awareness within Integrity®, giving users an
extensive range of chemistry options directly from their desktop," said Dr. Josep Prous, Jr., Executive Vice President of Prous Science.

About ChemAxon
ChemAxon is a leader in providing Java based chemical software development platforms for the biotechnology and pharmaceutical
industries. With core capabilities including structure visualization and management, property prediction, virtual synthesis, screening and drug
design, ChemAxon focuses upon active interaction with users and core portability to create powerful, cost effective cross platform solutions
and programming interfaces to power modern cheminformatics and chemical communication.

For more information:
Contact: Alex Allardyce
Tel: +36 1 453 2658

About Prous Science
For more than 40 years, Prous Science has been a trusted source of information on which science depends to discover safer and more
effective medicines. The company's products have evolved through the years from print journals to sophisticated electronic products
incorporating the latest advances in IT. More recently, Prous Science has begun a series of research projects pushing the convergence of drug discovery and knowledge mining. The results obtained by these initiatives are excellent and demonstrate industry-leading performance.
For more information about Prous Science, visit www.prous.com

For more information:
Prous Science
P.O. Box 540 - 08080 Barcelona - Spain
Contact: Virginia Elizondo
Tel: +34 934 592 220 - Fax: +34 934 581 535

Chemaxon Ltd
Máramaros köz 3/a
Budapest, 1037 Hungary
Tel.: +361 4532658
Fax.: +361 4532659

e-mail: aa@chemaxon.com

ChemAxon information and other resource links:
Products page: http://www.chemaxon.com/products.html
Demos page: http://www.chemaxon.com/demos.html
Try Marvin (java required):
http://www.chemaxon.com/demos/try_marvin.html

Presentation and papers: http://www.chemaxon.com/conf/
Marvin docs and download: http://www.chemaxon.com/marvin/
JChem docs and download: http://www.jchem.com/