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60 Million: It's more than just a number

The CAS REGISTRY represents the world's largest collection of small molecules.

Chemical Abstracts Service (CAS) has the best resources to serve chemists, related scientists, patent experts and information professionals from commercial, government or academic environments with their research!

As the world’s authority for chemical information, CAS provides the largest, most comprehensive databases of scientific information, assembled, curated and quality controlled by a global organization of CAS scientists. The CAS REGISTRY^SM provides more chemical substance information than any other resource.

For more information on CAS' comprehensive collection of databases, see CAS content at a glance.

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