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