Benidipine ortho-nitro impurities

3-(1-benzylpiperidin-3-yl) 5-methyl 2,6-dimethyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate Benidipine Impurity 5 5-(methoxycarbonyl)-4-(2-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid 3-(1-benzylpiperidin-3-yl) 5-methyl 2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate NA Benidipine oxidation impurities (hydrochloride) Benidipine Impurity 6 NA Benidipine Impurity S 5-(methoxycarbonyl)-4-(4-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid 3-(1-benzylpiperidin-3-yl) 5-methyl 2,6-dimethyl-4-(3-nitrosophenyl)pyridine-3,5-dicarboxylate 5-METHOXYCARBONYL-2,6-DIMETHYL-4(3-NITROPHENYL)-1,4-DIHYDROPYRIDINE-3-CARBOXYLIC ACID NA NA Benidipine Impurity G Benidipine Impurity Benidipine Impurity 3 Benidipine Impurity T