Profile: ChemAxon Kft. develops chemical software development platforms for the biotechnology and pharmaceutical industries. Our products & services include application programming interfaces and end user applications for structure visualization & management, property prediction, virtual synthesis, screening & drug design. We also offer custom tailored solutions in the areas of company specific database tools, intranet and front end solutions. Our calculator plugins are a range of structure based prediction tools used for filtering database search results, to define automatically calculated database fields from JChem base, JChem cartridge & instant JChem and to specify reaction rules in virtual reaction processing tool. Our JKlustor is a tool of JChem for clustering, diversity calculations & library comparisons based on molecular fingerprints & other descriptors, and it is useful in combinatorial chemistry, drug design & other areas where a large number of compounds need to be analyzed.