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