5-Cyano-4-hydroxy-3-(trifluoromethoxy)pyridine-2-sulfonamide
4-Cyano-3-methyl-2-(trifluoromethoxy)pyridine-6-methanol
3-Cyano-2-hydroxy-5-(trifluoromethoxy)pyridine-6-sulfonamide
3-Cyano-5-hydroxy-2-(trifluoromethoxy)pyridine-4-acetic acid
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