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