Chemical Abstracts Services

CAS (Chemical Abstracts Service) is a division of the American Chemical Society. We are located in Columbus, Ohio. CAS is the producer of the largest and most comprehensive databases of chemical information. Our principal databases are Chemical Abstracts (CA) which contains over 27 million document records from the chemical journal and patent literature, and Registry which contains over 31 million substance and 58 million sequence records.

CAS also operates STN International, an online service with partner organizations in Europe and Asia. STN provides access to a broad range of respected science and technology databases.