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