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