4-(Difluoromethyl)-3,6-dihydroxypyridine-2-sulfonamide
4-(Difluoromethyl)-2,5-dihydroxypyridine-3-sulfonamide
3-(Difluoromethyl)-2,5-dihydroxypyridine-6-sulfonamide
3-(Difluoromethyl)-2,5-dihydroxypyridine-4-sulfonamide
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