Amlodipine Azido Impurity

Amlodipine Azido Analog; 3-Ethyl 5-methyl 2-[(2-azidoethoxy)methyl]-4-(2-chlorophenyl)-6-methyl-1,4- 
dihydropyridine-3,5-dicarboxylate;2-[(2-Azidoethoxy)methyl]-4-(2-chlorophenyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarboxylic Acid 3-Ethyl 5-Methyl Ester; 2-[(2-Azidoethoxy)methyl]-4-(2-chlorophenyl)-3-ethoxycarbonyl-5-methoxycarbonyl)-6-methyl-1,4-dihydropyridine;