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The mol­ecules of the title compound, C13H14O4, the condensation product of vanillin and acetyl­acetone, are hydrogen bonded into a linear chain arising from interaction between the hydroxy group of one mol­ecule and the acetyl group of an adjacent mol­ecule.

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The title compound, C36H50O3·C2H4O2, crystallizes with acetic acid solvent mol­ecules in a 1.1 stoichiometric molar ratio. The mol­ecules are connected by intermolecular O—H...O hydrogen bonds, resulting in zigzag chains running along the [101] axis.

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The title compound, C18H14O3, also known as 1,2-di­hydro­tanshin­quinone, contains a four-ring system. No classical hydrogen bonds are found in the structure.

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The mol­ecules of the title compound, C16H12O4, are linked by hydrogen bonds involving the two hydr­oxy and carbon­yl O atoms, forming a three-dimensional network.

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In the title compound, C18H14O3·0.5H2O, also known as dihydro­tanshinone hemihydrate, the mol­ecular skeleton is a nearly planar. The two mol­ecules in the asymmetric unit are linked by O—H...O hydrogen bonds involving the carbonyl groups and the solvent water mol­ecule, forming moieties which are, in turn, linked via inter­molecular π–π stacking inter­actions into a two-dimensional sheet.
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