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