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