6-hydroxy-1,2-dihydro-4H-pyrrolo<3,2,1-ij>quinolin-4-one
1-indoline
5-acetyl-6-hydroxy-1,2-dihydro-4H-pyrrolo<3,2,1-ij>quinolin-4-one
8-hydroxy-4,5-dihydro-7H-pyrrolo<3,2,1-ij>pyrano<3,2-c>quinoline-7,10-dione
5-benzyl-6-hydroxy-1,2-dihydro-4H-pyrrolo<3,2,1-ij>quinolin-4-one