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