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