3,4-Dihydroxy-2-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
2,6-Dihydroxy-3-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
3,6-Dihydroxy-2-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
3,6-Dihydroxy-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine