title: 5,6-Dihy-droxy-7,8-di-meth-oxy-flavone.
abstract: 5,6-dihy-droxy-7,8-dimeth-oxy-2-phenyl-chromen-4-one), C17H14O6, is a flavone that was isolated from the petroleum ether-soluble fraction of the rare traditional Chinese medicinal herb Saussurea involucrata. The flavone mol-ecule is almost planar, with a dihedral angle between the planes of the benzo-pyran-4-one group and the attached phenyl group of 1.89 (6)°. The 5-hy-droxy group forms a strong intra-molecular hydrogen bond with the carbonyl group, resulting in a six-membered hydrogen-bonded ring. The 6-hy-droxy group also forms an intra-molecular O-H⋯O contact. In the crystal, the molecules are linked by O-H⋯O and C-H⋯O hydrogen bonds and π-π inter-actions [3.37 (2)-3.39 (2) Å], which build up a three-dimensional network.
authors.affiliation: Department of Pharmacy, Lanzhou General Hospital of PLA, Key laboratory of the prevention and cure, for the plateau environment damage PLA, 730050, Lanzhou Gansu, People's Republic of China.
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Jing
authors.forename: Xiao-Fei
authors.initials: XF
authors.lastname: Fan
authors.forename: Peng-Cheng
authors.initials: PC
authors.lastname: Fan
authors.forename: Lei
authors.initials: L
authors.lastname: He
authors.forename: Zheng-Ping
authors.initials: ZP
authors.lastname: Jia
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