InChI=1/C18H15N3O2/c1-3-23-18(22)12-10-13-14(19-11(12)2)8-9-21-16-7-5-4-6-15(16)20-17(13)21/h4-10H,3H2,1-2H benzimidazo[2,1-f][1,6]naphthyridine-2-carboxylic acid, 3-methyl-, ethyl ester ethyl 3-methylbenzimidazo[2,1-f]-1,6-naphthyridine-2-carboxylate