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