CAS Registry Number

• Name: CAS Registry Number
• Alternative Name: CAS Number
• Specification URI: https://www.cas.org/support/documentation/chemical-substances
• Scope: Substance
• Disciplines: Biology, Life Science, Other
• Keywords: chemicals
• Description: A CAS Registry Number, also referred to as CAS RN or informally CAS Number, is a unique numerical identifier assigned by the Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature.