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