Comments on: CAS Registry Numbers and How Confused We Are

By: Getting a CAS Number from a PubChem CID at So much to do, so little time

Getting a CAS Number from a PubChem CID at So much to do, so little time — Mon, 02 Feb 2009 06:07:00 +0000

[...] appears to have multiple CAS numbers in PubChem and this problem has been discussed by Antony a number of times. Finally, given the fact that it might be possible that some arbitrary string matches the [...]

By: Getting a CAS Number from a PubChem CID « So much to do, so little time

Getting a CAS Number from a PubChem CID « So much to do, so little time — Fri, 12 Dec 2008 02:49:37 +0000

By: Bear

Bear — Thu, 15 May 2008 19:39:38 +0000

It is useful to recall that ACS sells the RN number and so receives a little bit of revenue for each RN made. Each producer of aspirin might define their product in just enough a unique way (purity, polymorphism, etc) as to justify added RNs. The 2 dimensional chem drawing may be the same but other aspects can vary.