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