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