title: (22E,24R)-5α-Ergosta-2,22-dien-6-one.
abstract: In the title mol-ecule, C(28)H(44)O, two six-membered rings have regular chair conformations, while the six-membered ring containing the C=C double bond exhibits a distorted chair conformation. The five-membered ring adopts an envelope conformation. In the crystal, weak inter-molecular C-H⋯O inter-actions link mol-ecules into chains along the b axis. The absolute configuration was assigned to correspond with that of the known chiral centres in a precursor mol-ecule.
authors.forename: Liu-Qing
authors.initials: LQ
authors.lastname: Sheng
authors.forename: Fang
authors.initials: F
authors.lastname: Zeng
authors.forename: Fei
authors.initials: F
authors.lastname: Chen
authors.forename: Chun-Nian
authors.initials: CN
authors.lastname: Xia