3-(Difluoromethyl)-2,4,5-trihydroxypyridine
5-(Difluoromethyl)-2,3,6-trihydroxypyridine
4-(Difluoromethyl)-2,3,6-trihydroxypyridine
6-(Difluoromethyl)-2,3,5-trihydroxypyridine
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