6-fluoro-3-(methoxycarbonyl)-4-oxo-1,4-dihydroquinoline-2-carboxylic acid

4,5-dimethoxycarbonyl-1-(4'-fluorophenyl)-1H-pyrrole-2,3-dione

Ethyl 6-fluoro-4-oxo-1,4-dihydro-3-quinolinecarboxylate