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