Clopidogrel Impurity 38(Clopidogrel EP Impurity E R-Isomer);Clopidogrel EP Impurity E (R-Isomer);Clopidogrel EP Impurity F (R-Isomer);Clopidogrel EP Impurity E(R);(R)-2-(2-Chlorophenyl)-2-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetamide;Thieno[3,2-c]pyridine-5(4H)-acetamide, α-(2-chlorophenyl)-6,7-dihydro-, (αR)-