5,12-dihydro-benz[b]acridine

1,2,3,4-tetrahydro-benz[b]acridine-12-carboxylic acid

1H-benzo[f]indole-2,3-dione

3-acetoxy-1-acetyl-1H-benz[f]indole

2-(4-dimethylamino-phenylimino)-1,2-dihydro-benz[f]indol-3-one