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