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