6,7-difluoro-1-(2,4-difluorophenyl)-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid ethyl ester

2,4,5-三氟苯甲酸

2,4,5-三氟苯甲酰乙酸乙酯

ethyl 3-(2,4-difluoroanilino)-2-(2,4,5-trifluorobenzoyl)acrylate

2,4-二氟苯胺