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