A freely accessible database of chemicals with synthesis references from twelve respected chemistry journals. There are currently more than 40,000 compounds and 45,000 synthesis references in the database.
PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information (NCBI)
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Salem provides access to a growing number of reference works in its renowned scientific content both in traditional, printed form and online.