How does CAS assign Registry Numbers?Ī CAS Registry Number is assigned to a substance when it enters the CAS REGISTRY database. The right-most digit is a check digit used to verify the validity and uniqueness of the entire number.įor example, 58-08-2 is the CAS Registry Number for caffeine. What does a CAS Registry Number look like?Ī CAS Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts. ![]()
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