Synonyms: L-Cystine, Acetylcysteine Imp. A (EP), Acetylcysteine Impurity A, L-Cystine (9CI, ACI), Cystine, Cystine, L- (8CI), (-)-Cystine, 3,3′-Dithiobis(2-aminopropanoic acid), L-(-)-Cystine, L-Alanine, 3,3′-dithiobis-, L-Cysteine disulfide, L-Cystin, [R-(R*,R*)]-3,3′-Dithiobis[2-aminopropanoic acid], Bis(ß-amino-ß-carboxyethyl) disulfide, Cystine acid, Dicysteine, l-Cystine, NSC 13203, Oxidized L-cysteine, Propanoic acid, 3,3′-dithiobis[2-amino-, [R-(R*, R*)]-, ß,ß’-Diamino-ß,ß’-dicarboxydiethyl disulfide, ß,ß’-Dithiodialanine,, Tyrosine Impurity C.