Nicardipine Impurity A

Chemical Name: 2-​Cyclohexene-​1-​carboxylic acid, 2-​methyl-​6-​(3-​nitrophenyl)​-​4-​oxo-​, methyl ester; Methyl 2-methyl-6-(3-nitrophenyl)-4-oxo-2-cyclohexene-1-carboxylate ;