Abstract
The title compound, C19H18O7, also known as chrysoobtusin, was isolated from Cassia tora L. (Leguminosae). The anthraquinone ring system is almost planar, the dihedral angle between the two benzene rings being 4.27 (4)°. The structure is stabilized by intra- and intermolecular O—H⋯O and C—H⋯O hydrogen bonds, and by weak π–π stacking interactions along the b axis, with a centroid–centroid distance between related benzene rings of 3.800 (4) Å.
Highlights
College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510641, People’s Republic of China
Anthraquinone derivatives extracted from the seeds of Cassia tora L. have been used traditionally to improve visual acuity
One component found in Cassia tora L., 2-hydroxy-1,6,7,8-tetramethoxy-3-methylanthraquinone, is known as chrysoobusin and exhibits a variety of potent biological effects such as suppression of mutagenicity of mycotoxins (Hao et al, 1995), antioxidant activity (Jia et al, 2007) and hypolipidemic activity (Patil et al, 2004)
Summary
College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510641, People’s Republic of China. Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 2004); software used to prepare material for publication: SHELXTL
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