Download ChemIDplus Subset Data
About the Data
Learn about ChemIDplus DataChemIDplus DTD
ChemIDplus is a dictionary of over 400,000 chemicals (names, synonyms, and structures). ChemIDplus includes links to NLM and other databases and resources, including links to federal, state and international agencies.
NLM makes a subset of ChemIDplus data available for download. The ChemIDplus Subset file does not include the toxicity data, structural data, or data from USPDDN which may be found for many chemicals in the NLM web versions of the database. Contact Terri Markward (tam at usp dot org) of the U.S. Pharmacopeial Convention, Inc., the provider of USPDDN data for ChemIDplus, for information about leasing the USPDDN data directly from USP.
From January 20, 2022, two structure data files in plain text containing either SUPERID and SMILES in one, or SUPERID, InChI, and InChIKey in the other, are also available for download. Please note that a small fraction of SUPERID records with SMILES or InChI over the length of 4000 bytes are currently excluded.
The ChemIDplus Subset and the structure files are updated quarterly.
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The NLM Data License has been replaced by Terms and Conditions. No registration is required to access data available from NLM's FTP servers. Users will not be required to renew a license agreement at the end of the year.
Last Reviewed: October 19, 2022