title: (3R,4S,5S,8S,10R,13R)-3-Hy-droxy-kaura-9(11),16-dien-18-oic acid.
abstract: The title compound, C(20)H(28)O(3), was isolated during our investigation into the chemical composition and pharmacological activity of Centipeda cunninghamii (DC.) A. Braun & Asch. (Asteraceae). The enanti-opure 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 mol-ecule makes one intra- and one inter-molecular O-H⋯O hydrogen bond in the crystal lattice, forming hydrogen-bonded chains along [010]. The absolute configuration of the compound was assigned on the basis of optical rotation measurements.
authors.forename: Karren D
authors.initials: KD
authors.lastname: Beattie
authors.forename: Mohan M
authors.initials: MM
authors.lastname: Bhadbhade
authors.forename: Donald C
authors.initials: DC
authors.lastname: Craig
authors.forename: David N
authors.initials: DN
authors.lastname: Leach