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