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