Chemical Abstracts Service

Chemical Abstracts Service (CAS) is a division of the American Chemical Society that indexes chemical literature and substance information, including through its CAS Registry.

CAS Registry Number: A unique numerical identifier assigned by CAS to a chemical substance. The Registry Number gives each registered substance a stable identifier.
Chemical literature database: A searchable collection of publications and bibliographic records about chemistry. CAS abstracts and indexes literature into searchable records.
American Chemical Society: A professional organization founded in 1876 to advance chemistry and support chemists. CAS is a division of this organization.
Chemical patent search: The retrieval and analysis of patents using chemical names, structures, and related data. CAS indexing helps locate chemical disclosures across patent documents.
PubChem: An open chemistry database maintained by the U.S. National Library of Medicine. Unlike CAS's proprietary services, PubChem is a publicly accessible government resource.
CAS Registry: A database of chemical substance records maintained by Chemical Abstracts Service. It is CAS's central system for identifying and connecting substances.
Substance registration: The assignment of a distinct record and identifier to a chemical substance in a registry. CAS uses registration to distinguish substances despite varied names and representations.
William A. Noyes: An American chemist who helped establish Chemical Abstracts and served as its first editor. Noyes led the publication that became the foundation of CAS.
Chemical safety data: Information describing the hazards, handling, and effects of chemical substances. CAS substance identification helps connect safety information to the correct chemical.
ChEBI: A freely available ontology of small molecules maintained by the European Bioinformatics Institute. ChEBI emphasizes curated biological and chemical ontology rather than broad literature indexing.

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