DATABASES ON MEDICINE AND MOLECULAR BIOLOGY
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Chemical Entities of Biological Interest
 

Chemical Entities of Biological Interest (ChEBI) is a database of small molecular entities. The term molecular entity encompasses any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer, etc., identifiable as a separately distinguishable entity. The molecular entities in question are either products of nature or synthetic products used to intervene in the processes of living organisms.
http://www.ebi.ac.uk/chebi/