Each CAS Registry Number (often referred to as a CAS Number):
A CAS Registry Number is unique and specific to only one substance regardless of how many other ways the substance can be described (e.g., molecular formula, structure diagram, systematic names, generic names, proprietary or trade names, trivial names.
The CAS RN can be useful in searching SciFinder, STN databases, Chemical Abstract Society publications, governmental agency publications, some Elsevier databases.
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