InChI=1/C17H18N2O4/c1-5-23-17(21)12-8-11-13(22-4)7-6-10-14(11)15(18-12)19(9(2)3)16(10)20/h6-9H,5H2,1-4H ethyl 1-isopropyl-5-methoxy-2-oxo-1,2-dihydropyrrolo[4,3,2-ij]isoquinoline-7-carboxylate pyrrolo[4,3,2-ij]isoquinoline-7-carboxylic acid, 1,2-dihydro-5-methoxy-1-(1-methylethyl)-2-oxo-, ethyl ester