title: 3 beta,7 alpha,12 alpha-triformyloxy-24-nor-5 beta-chol-22-ene.
abstract: The title compound, alternatively called 24-nor-5 beta-chol-22-ene-3 beta,7 alpha,12 alpha-triyl triformate, C(26)H(38)O(6), has a cis junction between two of the six-membered rings. All three of the six-membered rings have chair conformations that are slightly flattened and the five-membered ring has a 13 beta,14 alpha-half-chair conformation. The 3 beta, 7 alpha and 12 alpha ring substituents are axial and the 17 beta group is equatorial. The 3 beta-formyloxy group is involved in one weak intermolecular C-H...O bond, which links the molecules into dimers in a head-to-head fashion.
authors.affiliation: CEMDRX, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, P-3004-516 Coimbra, Portugal.
authors.forename: L C R
authors.initials: LC
authors.lastname: Andrade
authors.forename: J A
authors.initials: JA
authors.lastname: Paixão
authors.forename: M J M
authors.initials: MJ
authors.lastname: de Almeida
authors.forename: E J Tavares
authors.initials: EJ
authors.lastname: da Silva
authors.forename: M L
authors.initials: ML
authors.lastname: Sá e Melo
authors.forename: F M Fernandes
authors.initials: FM
authors.lastname: Roleira