CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances.

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A CAS Registry Number[1] (also referred to as CAS RN[2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every …

CAS registry numbers are copyrighted by the American Chemical Society. Redistribution rights for CAS registry numbers are reserved by the American Chemical Society.

SciFinder® is a research tool for accessing CAS databases with literature from various scientific disciplines including biomedical sciences.

Oct 8, 2024 · A CAS number is a unique identifier assigned to every chemical substance described in the open scientific literature. This number, typically comprising up to ten digits, serves as a universal …

Chemical products are described in many different ways including chemical structures, generic, molecular formulas, systematic, common, and trade names.