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