4-(Difluoromethyl)-3,6-dihydroxypyridine-2-sulfonyl chloride
4-(Difluoromethyl)-2,5-dihydroxypyridine-3-sulfonyl chloride
3-(Difluoromethyl)-2,5-dihydroxypyridine-6-sulfonyl chloride
3-(Difluoromethyl)-2,5-dihydroxypyridine-4-sulfonyl chloride
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