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 -mangostin), C24H 26O6, 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.