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