Acta Cryst. (2007). E63, o3958-o3959  [ doi:10.1107/S1600536807041906 ]

Gerontoxanthone I methanol solvate

N. Boonnak, H.-K. Fun, S. Chantrapromma and C. Karalai

Abstract: A methanol solvate of gerontoxanthone I [systematic name: 4-(1,1-dimethylprop-2-enyl)-1,3,5,6-tetrahydroxy-2-(3-methylbut-2-enyl)-9H-xanthen-9-one methanol solvate], C₂₃H₂₄O₆·CH₃OH, is reported. Gerontoxanthone I was isolated from the roots of Cratoxylum formosum ssp. pruniflorum. The three rings in the structure are essentially coplanar. The 3-methylbut-2-enyl side chain is equatorially attached to the benzene ring, whereas the 1-methylbut-2-enyl substituent is bisectionally attached to the benzene ring. Intramolecular O-HO hydrogen bonds generate S(5) and S(6) ring motifs. In the crystal structure, intermolecular O-HO hydrogen bonds and C-HO interactions connect the molecules of gerontoxanthone I into chains along the [100] direction. The crystal structure is stabilized by intra- and intermolecular O-HO hydrogen bonds, weak C-HO intra- and intermolecular interactions, and C-H interactions.

Online 8 September 2007

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