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