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