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CAS Registry Number
A CAS Registry Number, also referred to as CASRN or CAS Number, is a unique numerical identifier assigned by Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature (currently including those described from at least 1957 through the present), including organic and inorganic compounds, mineralsisotopesalloys and nonstructurable materials (UVCBs, of unknown, variable composition, or biological origin).

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