4-Cyano-3-nitro-2-(trifluoromethoxy)pyridine-6-carboxaldehyde
4-Chloro-3-nitro-6-(trifluoromethoxy)pyridine-2-carboxaldehyde
3-Cyano-2-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-6-carboxaldehyde
4-Cyano-2-nitro-6-(trifluoromethoxy)pyridine-3-carboxaldehyde