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