title: 1α,6β,7β,11α,15β-Penta-hydr-oxy-7α,20-ep-oxy-ent-kaur-16-ene.
abstract: The title compound, C(20)H(30)O(6), a natural ent-kaurane diterpenoid, named nervosanin B, was obtained from the medicinal plant Isodon serra. It is composed of four rings with the expected trans and cis junctions. One of the six-membered rings is in a chair conformation, the other two are in boat conformations and the five-membered ring adopts an evenlope conformation. The mol-ecules stack along the a axis and are linked together by inter-molecular O-H⋯O hydrogen bonds. Two intramolecular O-H⋯O interactions also occur.
authors.forename: Chuang
authors.initials: C
authors.lastname: Feng
authors.forename: Lan-Qing
authors.initials: LQ
authors.lastname: Guo
authors.forename: Fu-Lin
authors.initials: FL
authors.lastname: Yan
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Cui
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Di