Acta Cryst. (2003). E59, o1858-o1859  [ doi:10.1107/S1600536803024620 ]

Alisol B monoacetate from the rhizome of Alisma orientale

Y.-P. Ye, C.-R. Sun, X.-Y. Li, H.-X. Sun and Y.-J. Pan

Abstract: The title compound, alisol B monoacetate or 11-hydroxy-24,25-epoxy-3-oxoprotost-13(17)-en-23-yl acetate, C₃₂H₅₀O₅, is a protostane-type triterpenoid which was isolated from the Chinese herbal medicine Alismatis Rhizoma (the rhizome of Alisma orientalis Juzep.). The molecule contains three six-membered rings, two of which adopt slightly distorted half-chair conformations while the third exhibits a chair conformation, and one five-membered ring, which adopts an envelope conformation. There is an intermolecular hydrogen bond between the hydroxy and epoxy groups, forming zigzag molecular chains along the b axis.

Online 31 October 2003

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