PubChem -- PubChem is a free database made available by the National Center for Biotechnology Information, the National Institute of Health, and the National Library of Medicine. It provides information on the biological activities of small molecules. PubChem includes substance information, compound structures, and bioactivity data from three primary databases, PCSubstance, PCCompound, and PCBioAssay.
Royal Society of Chemistry -- Indexes articles published in approx. 24 online journals from the Royal Society of Chemistry from Oct. 1997 to current date.
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