Captopril EP Impurity O Catalogue K640345 CAS N/A M.W 474.63 M.F C21H34N2O6S2 Specifications FAQs Synonyms:(2'S)-((2S,2'S)-3,3'-(propane-2,2-diylbis(sulfanediyl))bis(2-methylpropanoyl))di-L-proline