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  1. CAS REGISTRY®

    A CAS Registry Number (CAS RN®) is a unique and unambiguous identifier for a specific substance that allows clear communication and, with the help of CAS scientists, links together …

  2. CAS Common Chemistry

    Quickly confirm chemical names, CAS Registry Numbers®, structures or basic physical properties by searching compounds of general interest or leveraging an API connection.

  3. Empowering Innovation & Scientific Discoveries | CAS

    CAS provides solutions and services that help empower scientific discoveries. Learn how CAS can facilitate your research and drive innovation.

  4. CAS DATA

    2 days ago · The CAS Content Collection now includes life sciences data curated by our expert scientists. Answer key drug discovery questions with structure-activity relationships, …

  5. CAS SciFinder - 化合物データベース | CAS

    CAS SciFinder is curated by scientists and enhanced with AI-assisted tools to give you the insights you need with one simple search. Access the world’s most comprehensive chemical …

  6. CAS SciFinder - Chemical Compound Database

    CAS SciFinder is curated by scientists and enhanced with AI-assisted tools to give you the insights you need with one simple search. Access the world’s most comprehensive chemical …

  7. CAS Content

    Covering advances in chemistry and related sciences over the last 150 years, the CAS Content Collection empowers researchers, business leaders, and information professionals around the …

  8. CAS Registry Services℠

    CAS Registry Services helps you obtain CAS Registry Numbers® (CAS RNs®), CA Index Names, and substance information for reports, proprietary files, online searching, and regulatory …

  9. About CAS

    Jan 7, 2026 · Increase the return on your R&D investment with CAS. Our solutions empower you to consistently identify the best opportunities, get solutions to market faster, and minimize risks.

  10. CAS Databases Documentation | Chemical Information Resources

    CAS content covers all disclosed chemistry and related science from thousands of journals and 109 patent authorities, as well as reputable Web sources, dissertations, books, conference …