3-Chloro-2-hydroxy-4-(trifluoromethoxy)pyridine-6-sulfonyl chloride
2-Chloro-6-hydroxy-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
2-Chloro-5-hydroxy-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
2-Chloro-4-hydroxy-6-(trifluoromethoxy)pyridine-3-sulfonyl chloride