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