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