Levetiracetam EP Impurity A

diethyl (Z)-4-(2-(3-(tert-butoxy)-3-oxoprop-1-en-1-yl)phenyl)-2, 6-dimethyl-1, 4-dihydropyridine-3, 5-dicarboxylate.Lacidipine BP Impurity C ; Lacidipine cis-Isomer ;