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