2-Fluoro-4-(trifluoromethyl)benzoic acid4-Carboxy-alpha,alpha,alpha,3-tetrafluorotoluene2-Fluoro-4-(trifluoromethyl)benzoic acid 98%4-Carboxy-3-fluorobenzotrifluoride2-Fluoro-4-(trifluoromethyl)benzoic acidalpha,alpha,alpha,2-Tetrafluoro-p-toluic acid2-氟-4-(三氟甲基)苯甲酸