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A CAS Registry Nummer,[1] an aa referred tae as CASRN or CAS Nummer, is an unique numerical identifier assigned bi Chemical Abstracts Service (CAS) tae every chemical substance described in the open scienteefic leeteratur (currently includin those described frae at least 1957 through the present), includin organic an inorganic compoonds, minerals, isotopes, alloys an nonstructurable materials (UVCBs, o unkent, variable composeetion, or biological origin).[2]


  1. CAS registry description, by Chemical Abstracts Service
  2. American Chemical Society. "CAS Registry and CASRNs". Retrieved 25 July 2009.