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