SciFinder-n provides access to more than 100 years of chemistry and related science information through the combined coverage of Chemical Abstracts and MEDLINE.
PubChem contains information on the biological activities of small molecules. It includes substance information, compound structures, and bioactivity data in three connected databases. Published by the U.S. National Library of Medicine.
Search chemical information sourced from 500 data sources on the web by substance name, structure and properties. ChemSpider is owned by the Royal Society of Chemistry.
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