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