4,5,7,8,17-Pentahydroxy-14,18-dimethyl-6-methylene-3,10-dioxapentacyclo[9.8.0.01,7.04,19.013,18]nonadec-14-ene-9,16-dione methanol solvate dihydrate

4,5,7,8,17-Pentahydroxy-14,18-dimethyl-6-methylene-3,10-dioxapentacyclo[9.8.0.01,7.04,19.013,18]nonadec-14-ene-9,16-dione methanol solvate dihydrate

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The title quassinoid compound, C20H24O9·CH3OH·2H2O, is a natural fortiflex stable super fork - head only blue 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 dnd champagne sparkles further stacked along a axis.The absolute configuration of the title compound was inferred from previously solved structures of its analogues.