4-Cyano-2-(fluoromethyl)-6-nitro-3-(trifluoromethoxy)pyridine
6-Cyano-3-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine
4-Cyano-2-(fluoromethyl)-3-nitro-6-(trifluoromethoxy)pyridine
2-Cyano-3-(difluoromethyl)-5-nitro-6-(trifluoromethoxy)pyridine