5,7-Dihy­droxy-2-(3-hy­droxy-4,5-dimeth­oxy­phen­yl)-6-meth­oxy-4H-chromen-4-one

The title compound, C(18)H(16)O(8), was isolated from the plant Artemisia baldshuanica Krasch et Zarp. The mol­ecule is approximately planar, with the exception of the terminal methyl groups, the C atoms of which devitate from their attached ring planes by 1.243 (5) and 1.168 (5) Å. The dihedral angle between the substituted benzopyran and benzene rings is 5.8 (1)°; this near planarity could be due to conjugation or a packing effect. Intra­molecular O—H⋯O and C—H⋯O hydrogen bonds occur. In the crystal, mol­ecules are connected by O—H⋯O hydrogen bonds involving the hy­droxy and carbonyl groups, forming hydrogen-bonded chains along [001] and [1-10]. The chains are linked by C—H⋯O inter­actions.