Ethyl 4-bromo-5-(difluoromethyl)-2-nitropyridine-3-carboxylate
Ethyl 4-bromo-5-(difluoromethyl)-3-nitropyridine-2-carboxylate
Ethyl 4-bromo-3-(difluoromethyl)-2-nitropyridine-6-carboxylate
3-Bromo-4-(chloromethyl)-5-(difluoromethyl)-2-methoxypyridine