title: 5α-Dihydro-vespertilin acetate.
abstract: In the title compound, C(24)H(36)O(4) [systematic name: (20S)-3β-acet-oxy-16α-hydr-oxy-22,23-bis-nor-5α,17β-cholano(22-16)lac-tone], the three six-membered rings adopt classical chair conformations, while the five-membered rings are in envelope conformations. The ester group attached to ring A is in an equatorial position. Rings A/B, B/C and C/D are trans-fused, whereas rings D/E are cis-fused. The structure is devoid of any classical hydrogen bonds. However, non-classical inter- and intra-molecular hydrogen-bonding inter-actions of the type C-H⋯O are present in the structure.
authors.affiliation: Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4.
authors.forename: Michael
authors.initials: M
authors.lastname: Benn
authors.forename: Kanwal Nain
authors.initials: KN
authors.lastname: Vohra
authors.forename: Masood
authors.initials: M
authors.lastname: Parvez