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