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SciFinder: searches Chemical Abstracts, MEDLINE, the CAS Registry (over 70M compounds and 59M sequences), the CASREACT reaction database, and more
Reaxys: Database of substances, their properties, and their reactions, including the Beilstein organic and Gmelin inorganic data
Web of Science: performs topic and cited reference searching through the scientific literature
Pub Med: searches the medical and biochemical literature from 1950 forward
NCBI: Bioinformatics resources from the National Center for Biotechnology Information.
Science of Synthesis: Review source containing methods of organic synthesis