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