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
5-Cyano-4-(difluoromethyl)-2-(trifluoromethoxy)pyridine-3-carboxaldehyde