They offer a reliable, common and international link to every specific substance across the various nomenclatures and disciplines used by branches of science, industry, and regulatory bodies. Well-known chemicals may additionally be known via multiple generic, historical, commercial, and/or (black)-market names.ĬAS Registry Numbers (CAS RN) are simple and regular, convenient for database searches. Frequently these are arcane and constructed according to regional naming conventions relating to chemical formulae, structures or origins. Historically, chemicals have been identified by a wide variety of synonyms. ( June 2017) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.
Cas number search license#
A collection of almost 500 thousand CAS registry numbers are made available under a CC-BY-NC license at ACS Commons Chemistry. It is updated with around 15,000 additional new substances daily.
Cas number search plus#
It identifies more than 182 million unique organic and inorganic substances and 68 million protein and DNA sequences, plus additional information about each substance. The registry maintained by CAS is an authoritative collection of disclosed chemical substance information.
Cas number search serial numbers#
CAS RNs are generally serial numbers (with a check digit), so they do not contain any information about the structures themselves the way SMILES and InChI strings do. It is a chemical database that includes organic and inorganic compounds, minerals, isotopes, alloys, mixtures, and nonstructurable materials (UVCBs, substances of unknown or variable composition, complex reaction products, or biological origin). It includes all substances described from 1957 through the present, plus some substances from as far back as the early 1800s. A CAS Registry Number, also referred to as CAS RN or informally CAS Number, is a unique identification number assigned by the Chemical Abstracts Service (CAS), US to every chemical substance described in the open scientific literature.
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