4-(Bromomethyl)-5-(difluoromethyl)-3-methoxypyridine-2-carboxaldehyde
4-(Bromomethyl)-3-(difluoromethyl)-2-methoxypyridine-6-carboxaldehyde
4-(Bromomethyl)-6-(difluoromethyl)-2-methoxypyridine-3-carboxaldehyde
3-(Bromomethyl)-5-(difluoromethyl)-6-methoxypyridine-2-carboxaldehyde