title: [The isolation and identification of two new epimer from the mother liquid of testosterone].
abstract: OBJECTIVE
  To study the impurity of the drug testosterone.
  
  
  METHODS
  Chromatography methods were used to separate the chemical constituents. Their structures were determined by NMR and MS spectral analysis.
  
  
  RESULTS
  Two new epimers were isolated from the mother liquid of the drug.
  
  
  CONCLUSIONS
  These new epimers were identified as 3alpha-ethoxyandrost-4-en-17beta-ol, 3beta-ethoxyandrost-4-en-17beta-ol.
authors.affiliation: Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
authors.forename: Zhong-Duo
authors.initials: ZD
authors.lastname: Yang
authors.forename: You-Fu
authors.initials: YF
authors.lastname: Wang
authors.forename: Li-Bo
authors.initials: LB
authors.lastname: Lin
authors.forename: Yuan-Chao
authors.initials: YC
authors.lastname: Li
mesh_terms: D000737:Androstenols / Q000737:chemistry / Q000302:isolation & purification*; D004340:Drug Contamination; D008968:Molecular Conformation; D015394:Molecular Structure; D013237:Stereoisomerism; D013739:Testosterone / Q000737:chemistry*
chemical_list: C494585:3-ethoxyandrost-4-en-17-ol; D000737:Androstenols; D013739:Testosterone