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CAS REGISTRY and CAS Registry Number

What is CAS REGISTRY? What is a CAS Registry NumberŪ (CAS RN)? What does a CAS Registry Number look like? How does CAS assign Registry Numbers? What kinds of compounds does the CAS REGISTRY contain? How frequently is the CAS REGISTRY updated? Why have CAS Registry Numbers become the world standard? Why do regulatory agencies rely on CAS Registry Numbers? Where can I find CAS Registry Numbers? Why do some substances in CAS REGISTRY have zero associated references? How can I learn more about these substances? How can I obtain or request assignment of a CAS Registry Number? Why is it important to come to CAS for Registry Numbers?