Acta Cryst. (2011). E67, o2607-o2608 [ doi:10.1107/S1600536811036294 ]
Abstract: The title compound [systematic name: 5,10-dihydroxy-2,2-dimethyl-12-(2-methylbut-3-en-2-yl)pyrano[3,2-b]xanthen-6(2H)-one], C23H22O5, isolated from the stem bark of Calophyllum soulattri, consists of four six-membered rings and a 2-methylbut-3-en-2-yl side chain. The tricyclic xanthone ring system is almost planar [maximum deviation = 0.093 (2) Å], whereas the pyranoid ring is in a distorted boat conformation. The 2-methylbut-3-en-2-yl side chain is in a synperiplanar conformation. There are two intramolecular O-H
O hydrogen bonds. In the crystal, molecules are linked by C-HO interactions, forming a zigzag chain propagating in [010].
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