title: 5α-Pregna-1,20-dien-3-one.
abstract: The title compound, C(21)H(30)O, was isolated from the soft coral Sinularia sp. The mol-ecule contains four alicyclic rings, all trans-fused, among which three six-membered rings are in different distorted chair conformations while a five-membered ring assumes an envelope form.
authors.forename: Guang-Ying
authors.initials: GY
authors.lastname: Chen
authors.forename: Mei-Yan
authors.initials: MY
authors.lastname: Wei
authors.forename: Ni
authors.initials: N
authors.lastname: Tan
authors.forename: Zhen
authors.initials: Z
authors.lastname: Liu
authors.forename: Rui-Yun
authors.initials: RY
authors.lastname: Yang