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ChemIDplus

ChemIDplus is a free, web-based search system that provides numerous chemical synonyms, structures, regulatory list information, and links to other databases containing information about chemical substances cited in National Library of Medicine (NLM) databases. The database contains over 368,000 chemical records, of which over 238,000 include chemical structures, and is searchable by Name, Synonym, CAS Registry Number, Molecular Formula, Classification Code, Locator Code, and Structure.
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