title: Structure elucidation of cyasterone stereoisomers isolated from Cyathula officinalis.
abstract: Chemical investigation of ecdysteroidal constituents of the roots and stems of Cyathula officinalis led to the isolation of two cyasterone stereoisomers, 2 and 3, together with the known cyasterone 1. The structures of compounds 2 and 3 were determined to be 28-epi-cyasterone and 25-epi-28-epi-cyasterone, respectively, by means of spectroscopic analysis. X-Ray structures of 1 and 2 confirmed the 24S,25S,28R configuration for 1 and 24S,25S,28S for 2.
authors.affiliation: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Okuzumi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Hara
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Uekusa
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Fujimoto
mesh_terms: D027703:Amaranthaceae / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism; D013265:Stigmasterol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: C002082:cyasterone; D013265:Stigmasterol