title: [Isolation and structure identification of C-25 epimers of inokosterone from Achyranthes bidentata Blume].
abstract: OBJECTIVE
  To isolate C-25 epimers of inokosterone from Achyranthes bidentata Blume. and identify their structures.
  
  
  METHODS
  To separate C-25 epimers of inokosterone by using various kinds of chromatography methods and identify their structures on basis of spectral analysis and chemical method.
  
  
  RESULTS
  Three compounds were isolated and their structures were established as 25S-inokosterone (1), 25R-inokosterone (2) and ecdysterone (3).
  
  
  CONCLUSIONS
  Compounds 1 and 2 are new C-25 configuration isomers from Achyranthes bidentata Blume., their absolute configurations are elucidated at the first time, and their 13CNMR data are reported for the first time.
authors.affiliation: Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Zhu
authors.forename: Hong
authors.initials: H
authors.lastname: Liang
authors.forename: Yu-Ying
authors.initials: YY
authors.lastname: Zhao
authors.forename: Ben
authors.initials: B
authors.lastname: Wang
mesh_terms: D029044:Achyranthes / Q000737:chemistry*; D002782:Cholestenes / Q000737:chemistry / Q000302:isolation & purification*; D004441:Ecdysterone / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D002782:Cholestenes; C100084:inokosterone; D004441:Ecdysterone