title: (3S,12R,20S,24R)-20,24-Ep-oxy-dammarane-3,12,25-triol.
abstract: In the title mol-ecule, C(30)H(52)O(4), the three six-membered rings are in chair conformations, the cyclo-pentane ring is in an envelope form and the tetra-hydro-furan ring has a conformation inter-mediate between half-chair and sofa. In the crystal, mol-ecules are linked by inter-molecular O-H⋯O hydrogen bonds into helical chains along [100]. Two intra-molecular O-H⋯O hydrogen bonds are also present. One C atom of the tetrahydrofuran ring and its attached H atoms are equally disordered over two sets of sites.
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Li
authors.forename: Huan-Mei
authors.initials: HM
authors.lastname: Guo
authors.forename: Chun-Mei
authors.initials: CM
authors.lastname: Ji
authors.forename: Yi
authors.initials: Y
authors.lastname: Bi
authors.forename: Qing-Guo
authors.initials: QG
authors.lastname: Meng
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Fitoterapia. 2010 Oct;81(7):783-7
references.pmid: 20398743
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2010 Dec 11;67(Pt 1):o59
references.pmid: 21522769
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 17;66(Pt 12):o3210
references.pmid: 21589503