Ethyl 3-bromo-2-(difluoromethyl)-4-fluoropyridine-6-carboxylate
Methyl 4-bromo-2-(difluoromethyl)-6-methoxypyridine-3-carboxylate
Ethyl 6-bromo-2-(difluoromethyl)-3-fluoropyridine-4-carboxylate
Methyl 4-bromo-2-(difluoromethyl)-5-methoxypyridine-3-carboxylate