1,6-naphthyridine-3-carboxylic acid, 6-(2-aminophenyl)-5,6-dihydro-2-methyl-5-oxo-, ethyl ester InChI=1/C18H17N3O3/c1-3-24-18(23)12-10-13-15(20-11(12)2)8-9-21(17(13)22)16-7-5-4-6-14(16)19/h4-10H,3,19H2,1-2H ethyl 6-(2-aminophenyl)-2-methyl-5-oxo-5,6-dihydro-1,6-naphthyridine-3-carboxylate