Acta Cryst. (2007). E63, o4062-o4063  [ doi:10.1107/S1600536807044339 ]

2,19-Dihydroxy-3-oxo-(2,4,19)-24-nor-olean-12-en-28-oic acid monohydrate

W. Waratchareeyakul, K. Seatyoa, S. Chantrapromma and H.-K. Fun

Abstract: The title triterpenoid compound, C₂₉H₄₄O₅·H₂O, was isolated from Terminalia triptera. The molecule contains five fused six-membered rings, with three rings in chair, one in an envelope and one in half-chair conformations. The D and E rings are cis-fused, while the other ring junctions are trans-fused. An intramolecular O-HO hydrogen bond generates an S(5) ring motif. In the crystal structure, the molecules are linked into a three-dimensional network by O-HO hydrogen bonds and a weak C-HO intermolecular interaction. The crystal structure is stabilized by intra- and intermolecular O-HO hydrogen bonds and weak C-HO interactions.

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