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