(3R,4S,5S,8S,10R,13R)-3-Hydroxykaura- 9(11),16-dien-18-oic acid
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Abstract: The title compound, C20H28O3, was isolated during our investigation into the chemical composition and pharmacological activity of Centipeda cunninghamii (DC.) A. Braun & Asch. (Asteraceae). The enantiopure compound, a diterpene with a carbon skeleton, is composed of three six- and one five-membered rings in chair, twist-boat, half-chair and envelope conformations, respectively. Each molecule makes one intra- and one intermolecular O-HO hydrogen bond in the crystal lattice, forming hydrogen-bonded chains along . The absolute configuration of the compound was assigned on the basis of optical rotation measurements.
Acta Crystallographica Section E
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Structural Chemistry and Spectroscopy