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