title: 5α-Hy-droxy-eudesm-4(15),11(13)-dien-8β,12-olide.
abstract: The title compound, C(15)H(20)O(3), a sesquiterpene lactone, was isolated from the aerial parts of Carpesium minus Hemsl. (Compositae). The mol-ecule is composed of three rings, with the two cyclo-hexane rings in chair conformations and the cyclo-pentane ring adopting a twist conformation. The A/B ring junction is trans-fused. The absolute configuration shown has been arbitrarily assigned. In the crystal, mol-ecules are linked into [100] chains by O-H⋯O hydrogen bonds.
authors.affiliation: Research Center of Medical Chemistry and Chemical Biology, Chongqing Technology and Business University, Chongqing 400067,  People's Republic of China.
authors.forename: Xue
authors.initials: X
authors.lastname: Gao
authors.forename: Gang
authors.initials: G
authors.lastname: Chen