Clopidogrel EP Impurity A (R-Isomer) ((R)-Clopidogrel Carboxylic Acid) Catalogue L620411 CAS 324757-50-8 M.W 307.79 M.F C15H14ClNO2S Specifications FAQs (R)-2-(2-Chlorophenyl)-2-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetic acid