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