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