(E)-1-(1,3,6,8-Tetra­methoxy­naphthalen-2-yl)­but-2-en-1-one

In the title compound, C₁₈H₂₀O₅, one of the four methoxy groups is twisted out of the naphthalene ring plane as a result of steric hindrance. The orientation of the butenone substituent with respect to the attached ring is anticlinal.

2-(3,7-Dimethyl­octa-2,6-dien­yl)-1,3,5,8-tetra­hydroxyxanthone

The title compound, C₂₃H₂₄O₆, a xanthone derivative, was isolated from Garcinia polyantha Oliver. The orientation of the 3,7-dimethyl­octa-2,6-dienyl substituent with respect to the xanthone ring system is (+)synclinal. The crystal packing is stabilized by O—H...O and C—H...O inter­molecular hydrogen bonds and π–π inter­actions.