3-pyridinecarboxylic acid, 6-chloro-5-formyl-1,4-dihydro-2-methyl-4-(4-nitrophenyl)-, ethyl ester InChI=1/C16H15ClN2O5/c1-3-24-16(21)13-9(2)18-15(17)12(8-20)14(13)10-4-6-11(7-5-10)19(22)23/h4-8,14,18H,3H2,1-2H ethyl 6-chloro-5-formyl-2-methyl-4-(4-nitrophenyl)-1,4-dihydropyridine-3-carboxylate