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