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