2-Cyano-6-nitro-3-(trifluoromethoxy)pyridine-4-carboxaldehyde
6-Cyano-3-nitro-4-(trifluoromethoxy)pyridine-2-carboxaldehyde
4-(Bromomethyl)-3-cyano-2-nitro-5-(trifluoromethoxy)pyridine
3-Cyano-5-(difluoromethyl)-4-(trifluoromethoxy)pyridine-2-carboxaldehyde