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