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Osajin [systematic name: 5-hydroxy-3-(3-hydroxy­phenyl)-8,8-di­methyl-6-(3-methyl­but-2-enyl)-4H,8H-pyrano­[2,3-h]­chro­men-4-one, C25H24O5, crystallizes with two independent mol­ecules in the asymmetric unit. The benzo­pyran­one ring system is nearly planar in both mol­ecules and they differ significantly only in the orientation of the benzene rings, which are rotated by 56.27 (7) and 44.16 (7)° with respect to the benzo­pyran­one systems. In the crystal structure, intermolecular O—H...O hydrogen bonds link the mol­ecules into dimers.

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The title compound, C11H15NO2, contains a planar diethyl­amine group with an sp2-hybridized N atom bonded to a nearly planar salicylaldehyde fragment. Electron density from the diethyl­amine group is transferred to a pseudo-ring formed by an intra­molecular O—H...O hydrogen bond involving the aldehyde and hydr­oxy groups. In the crystal structure, the mol­ecules form C—H...O hydrogen-bonded centrosymmetric dimers.
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