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