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