1-(2,4-difluorophenyl)-6-fluoro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid

1,2,4-三氟苯

2,4,5-三氟苯甲酸甲酯

tert-butyl 2,4,5-trifluorobenzoate

2,4,5-三氟苯甲酰氯