Abstract
The title quassinoid compound, C20H24O9·CH3OH·2H2O, is a natural eurycomanone isolated from the roots of Eurycoma longifolia. The molecules contain a fused five-ring system, with one tetrahydrofuran ring adopting an envelope conformation, one tetrahydropyran-2-one ring in a screw boat conformation, one cyclohexenone ring in a half-chair conformation and two cyclohexane rings in chair conformations. Intramolecular C—H⋯O interactions generate S(5) ring motifs and an O—H⋯O interaction generates an S(7) ring motif. In the crystal, molecules are linked via intermolecular O—H⋯O interactions along the b axis and further stacked along a axis. The absolute configuration of the title compound was inferred from previously solved structures of its analogues.
Highlights
The title quassinoid compound, C20H24O9CH3OH2H2O, is a natural eurycomanone isolated from the roots of Eurycoma longifolia
The absolute configuration of the title compound was inferred from previously solved structures of its analogues
For the stability of the temperature controller used for the data collection, see: Cosier & Glazer
Summary
Experimental a School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bX-ray Crystallography Unit, School of Physics, Universiti Sains. R factor = 0.043; wR factor = 0.127; data-to-parameter ratio = 11.7. The title quassinoid compound, C20H24O9CH3OH2H2O, is a natural eurycomanone isolated from the roots of Eurycoma longifolia. The molecules contain a fused five-ring system, with one tetrahydrofuran ring adopting an envelope conformation, one tetrahydropyran-2-one ring in a screw boat conformation, one cyclohexenone ring in a half-chair conformation and two cyclohexane rings in chair conformations. H O interaction generates an S(7) ring motif. Molecules are linked via intermolecular O—H O interactions along the b axis and further stacked along a axis. The absolute configuration of the title compound was inferred from previously solved structures of its analogues
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