What is it about?
CAS registry numbers are proprietary identifiers with a single provider, and this post discusses Wikidata which provides a large collection of CAS numbers and for many matching SMILES strings.
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Why is it important?
These CAS registry numbers are abundantly used identifiers, and their limited availability has been a serious interoperability issue in the life sciences. Wikidata provides a large collection of CAS registry numbers, for everyone to use under a very liberal CCZero waiver.
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This page is a summary of: New Edition! Getting CAS registry numbers out of WikiData, Authorea, Inc.,
DOI: 10.15200/winn.145228.82018.
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