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I'm trying to find a full list of CAS Registry Numbers, but it looks like it's not in open access. Is it a proprietary database that can't be downloaded easily?

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  • $\begingroup$ You may find CAS#s by typing individual chemicals you are interested in. Any vendor catalog such as Sigma-Aldrich provides long list of chemicals and their CAS#s. $\endgroup$ Commented Jul 7, 2022 at 19:30
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    $\begingroup$ CAS.org is the entity in charge of the registry. Various places to find numbers are shown on the FAQ page (cas.org/support/documentation/chemical-substances/faqs). They put time and effort into keeping the database and entering new compounds. $\endgroup$
    – Jon Custer
    Commented Jul 7, 2022 at 20:11

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