title: 5,7-Dihy-droxy-2-(3-hy-droxy-4,5-dimeth-oxy-phen-yl)-6-meth-oxy-4H-chromen-4-one.
abstract: The title compound, C18H16O8, was isolated from the plant Artemisia baldshuanica Krasch et Zarp. The mol-ecule 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. Intra-molecular O-H⋯O and C-H⋯O hydrogen bonds occur. In the crystal, mol-ecules are connected by O-H⋯O hydrogen bonds involving the hy-droxy and carbonyl groups, forming hydrogen-bonded chains along [001] and [1-10]. The chains are linked by C-H⋯O inter-actions.
authors: S. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of Uzbekistan, Mirzo Ulugbek Str. 77, Tashkent 100170, Uzbekistan.
authors: Shahobiddin M
authors: SM
authors: Adizov
authors: Rimma F
authors: RF
authors: Mukhamathanova
authors: Kambarali K
authors: KK
authors: Turgunov
authors: Ildar D
authors: ID
authors: Sham'yanov
authors: Bakhodir
authors: B
authors: Tashkhodjaev
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677
references: Nat Prod Rep. 2011 Oct;28(10):1626-95
references: 21845280