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