Provides information on the biological activities of small molecules. Organized into 3 databases: PubChem Substance, PubChem Compound, and PubChem BioAssay. PubChem also provides a fast chemical structure similarity search tool.
This group of databases from the National Library of Medicine includes information on toxicology, environmental health, and chemical releases. Also includes ChemIDplus, which has information on over 400,000 chemicals.