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