2,2'-Bipyridine-6,6'-diol
http://www.cosmoscience.org/shop/fm-3b-b3966-22-bipyridine-66-diol-39696
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2,2'-Bipyridine-6,6'-diol 1g : Chelating ligand for metal coordination, catalysis, and fluorescence sensing; hydroxyl groups improve solubility.
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