Acta Cryst. (2010). E66, o2897-o2898  [ doi:10.1107/S1600536810042078 ]

ent-5,3,15-Dioxodolabr-4(18)-ene-16,18-diol

H.-K. Fun, C. Pakathirathien, C. Karalai and S. Chantrapromma

Abstract: The title compound, C₂₀H₃₀O₄, is a dolabrane diterpenoid isolated from Ceriops tagal, in which one of the three fused cyclohexane rings adopts a half-chair conformation and the other two are in the standard chair conformations. The hydroxymethylidene substituent is attached to the half-chair cyclohexane. An intramolecular O-HO hydrogen bond generate an S(6) ring motif. In the crystal, molecules are arranged into screw chains along the [001] direction. The crystal is stabilized by O-HO hydrogen bonds and weaker C-HO interactions.

Online 23 October 2010

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