Acta Cryst. (2010). E66, o2899 [ doi:10.1107/S160053681004208X ]
Abstract: In the title compound, C20H28O4, a diterpenoid isolated from the roots of Premna obtusifolia (Verbenaceae), the five-membered ring is in a half-chair conformation. One six-membered ring exists in a twisted-boat conformation while the other is in half-boat conformation. The crystal packing is stabilized by intermolecular O-HO and weak C-HO interactions, generating (001) sheets.
Online 23 October 2010
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