Chemistry

CAS Common Chemistry is an open community resource for information on chemical substances from CAS REGISTRY.

ChemSpider is a free chemical structure database providing fast text and structure search access from hundreds of data sources.

National Institute of Standards & Technology thermochemical, spectra, ion energetics, and chromatography data for thousands of compounds. Search by formula, name, CAS registry number name, and more.

Search for a chemical name. Results appear. If there are no results, there is an explanation for failure in interpretation of the search.