InChI=1/C21H18N2O4/c1-4-27-21(25)16-11-15-17(26-3)10-9-14-18(15)19(22-16)23(20(14)24)13-7-5-12(2)6-8-13/h5-11H,4H2,1-3H ethyl 5-methoxy-1-(4-methylphenyl)-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-(4-methylphenyl)-2-oxo-, ethyl ester