4-(Difluoromethyl)-3,6-dihydroxypyridine-2-carboxamide
4-(Difluoromethyl)-2,5-dihydroxypyridine-3-carboxamide
3-(Difluoromethyl)-2,5-dihydroxypyridine-6-carboxamide
3-(Difluoromethyl)-2,5-dihydroxypyridine-4-carboxamide
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