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The title compound, C17H16O5, crystallizes with two independent mol­ecules in the asymmetric unit. These are oriented approximately orthogonal to one another. The keto group adopts an s-cis conformation; the six-membered ring formed by the O—H...O hydrogen bond and the adjacent benzene ring are approximately coplanar. In addition to an intra­molecular O—H...O hydrogen bond, inter­molecular O—H...O inter­actions link adjacent mol­ecules into chains.
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