Clopidogrel EP Impurity D Sulfate Catalogue L620416 CAS 1421283-60-4 M.W 490.40 98.07 M.F C24H21Cl2NO4S. H2SO4 Specifications FAQs (R)-1-(2-chlorophenyl)-2-methoxy-2-oxoethyl (S)-2-(2-chlorophenyl)-2-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetate, sulfate (1:1)