title: 1,3,6-Trihy-droxy-7-meth-oxy-2,8-bis-(3-methyl-but-2-en-yl)-9H-xanthen-9-one.
abstract: The title compound (trivial name α-mangostin), C(24)H(26)O(6), isolated from Cratoxylum glaucum, is characterized by a xanthone skeleton of three fused six-membered rings and two 3-methyl-but-2-enyl side chains. The three rings in the structure are nearly coplanar, with an r.m.s. deviation for the tricyclic ring system of 0.0014 Å. The two 3-methyl-but-2-enyl side chains are in (+)-synclinal and (-)-anti-clinal conformations. Intra-molecular O-H⋯O and C-H⋯O inter-actions occur. The crystal structure is stabilized by inter-molecular O-H⋯O, C-H⋯O and C-H⋯π inter-actions.
authors: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors: Gwendoline Cheng Lian
authors: GC
authors: Ee
authors: Wei Chung
authors: WC
authors: Sim
authors: Huey Chong
authors: HC
authors: Kwong
authors: Mohamed Ibrahim
authors: MI
authors: Mohamed Tahir
authors: Sidik
authors: S
authors: Silong
references: Acta Crystallogr C. 2003 Mar;59(Pt 3):o127-8
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references: Planta Med. 2006 Dec;72(15):1433-5
references: 17091434