![]() Those days are quickly starting to seem as quaint as when people actually wrote on pieces of paper and dropped them in mailboxes ( dropping DVDs in a mailbox is a different matter).Ī little-publicized feature of PubChem makes it an ideal way to quickly find the structure associated with a CAS Number. Your first impulse when looking up a CAS number might be to fire up SciFinder. By looking up the CAS number, I could confirm the bottle's contents. A common case was when an ambiguous, incomprehensible, or blurred IUPAC name was printed on a reagent bottle along with a CAS number. These short numerical sequences are arguably the most widely-used form of molecular identifier, appearing on reagent bottles, in publications, in patents and patent applications, and MSDS sheets.ĭuring my time as a synthetic organic chemist, I would sometimes run into the problem of finding the structure of a molecule represented by a CAS number. CAS Registry Numbers simplify the thorny problem of referring to chemical substances.
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