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