1H-pyrrole-2-carboxylic acid, 4-ethyl-1-(2-nitrobenzoyl)-, ethyl ester InChI=1/C16H16N2O5/c1-3-11-9-14(16(20)23-4-2)17(10-11)15(19)12-7-5-6-8-13(12)18(21)22/h5-10H,3-4H2,1-2H ethyl 4-ethyl-1-(2-nitrobenzoyl)-1H-pyrrole-2-carboxylate