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