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Cystine
C6H12N2O4S2 240.30
 l-Cystine;
 3,3′-Disulfanediylbis [(2R)-2-aminopropanoic acid] [56-89-3]

DEFINITION

Cystine contains NLT 98.5% and NMT 101.5% of cystine (C6H12N2O4S2), as l-cystine, calculated on the dried basis.

USP REFERENCE STANDARDS FOR PURCHASE

USP Arginine Hydrochloride RS
USP Cystine RS
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