4-(Difluoromethyl)-3,6-dihydroxypyridine-2-carboxylic acid
4-(Difluoromethyl)-2,5-dihydroxypyridine-3-carboxylic acid
3-(Difluoromethyl)-2,5-dihydroxypyridine-6-carboxylic acid
3-(Difluoromethyl)-2,5-dihydroxypyridine-4-carboxylic acid
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