title: [Studies on chemical constituents of the seeds of Allium cepa].
abstract: OBJECTIVE
  To study the chemical constituents from the seeds of Allium cepa L., the constituents of the seeds of Allium cepa L.
  
  
  METHODS
  To isolate and purify by silica gel, macroporous resin HP-20, Sephadex LH-20, RP-18 column.
  
  
  RESULTS
  Seven compounds were isolated from the EtOH extract of the seeds of Allium cepa., their structures were elucidated by physico-chemical properties and spectroscopic analysis as tianshic acid (I), N-trans-feruloyl tyramine (II), beta-sitosterol-3 beta-glucopyranoside-6'-palmitate (III), sitosterol (IV), daucosterol (V), tryptophane (VI), adenine riboside (VI).
  
  
  CONCLUSIONS
  Compounds V-VIII are obtained from this plant for the first time, compounds I-IV are isolated from the genus Allium for the first time.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Yuan
authors.forename: Teng-Fei
authors.initials: TF
authors.lastname: Ji
authors.forename: Ai-Guo
authors.initials: AG
authors.lastname: Wang
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Yang
authors.forename: Ya-Lun
authors.initials: YL
authors.lastname: Su
mesh_terms: D000241:Adenosine / Q000737:chemistry / Q000302:isolation & purification*; D000431:Ethanol / Q000737:chemistry; D019697:Onions / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D012855:Sitosterols / Q000737:chemistry / Q000302:isolation & purification; D014364:Tryptophan / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012855:Sitosterols; D000431:Ethanol; C025473:gamma-sitosterol; D014364:Tryptophan; D000241:Adenosine; C011015:lyoniside