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