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