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