Ethyl 3-bromo-2-(chloromethyl)-5-(difluoromethyl)pyridine-6-carboxylate
Ethyl 3-bromo-2-(chloromethyl)-4-(difluoromethyl)pyridine-6-carboxylate
Ethyl 6-bromo-2-(chloromethyl)-3-(difluoromethyl)pyridine-4-carboxylate
Ethyl 6-bromo-2-(chloromethyl)-4-(difluoromethyl)pyridine-3-carboxylate