Ethyl 3-(difluoromethyl)-2-fluoro-5-(trifluoromethoxy)pyridine-6-acetate
Ethyl 3-(difluoromethyl)-2-fluoro-4-(trifluoromethoxy)pyridine-5-acetate
Ethyl 6-(difluoromethyl)-3-fluoro-4-(trifluoromethoxy)pyridine-2-acetate
Ethyl 6-(difluoromethyl)-4-fluoro-3-(trifluoromethoxy)pyridine-2-acetate