ethyl 5-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate

4-氟-2-硝基苯胺

2-溴-5-氟硝基苯

2-溴-5-氟苯胺

ethyl 8-bromo-5-fluoro-4-hydroxyquinoline-3-carboxylate