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.

SUBMITTER: Adizov SM 

PROVIDER: S-EPMC3629625 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature