CAS Registry Number
CHEMICAL IDENTIFIER
CAS number; CAS registry; CAS numbers; CAS RN; Cas number; CAS Number; CAS reference number; Chemical abstracts service registry number; Chemical Abstracts Service Registry Number; CAS-number; Registry number; Cas registry number; CAS registry numbers; CAS Registry number; CAS registry number; CASRN
A CAS Registry Number,CAS registry description , by Chemical Abstracts Service 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. It includes all substances described from 1957 through the present, plus some substances from as far back as the early 1800s.