title: [Studies on chemical constituents of Eleutherine americana].
abstract: OBJECTIVE
  To research the chemical constituents from Eleutherine americana.
  
  
  METHODS
  Column chromatography with silica gel was employed to isolate and purify the constituents. Their structures were elucidated by means of MS and NMR.
  
  
  RESULTS
  Eight constituents were obtained and identified as Isoeleutherol (1), eleutherin (2), isoeleutherin (3), beta-sitosterol(4), 8-hydroxy-3, 4-Dimethoxy-1-methyl-anthra-9, l0-quinone-2-carboxylic acid methyl ester (5), Hongconin (6), 4,8-Dihydroxy-3-Methoxy-1-methyl-anthra-9,10-quinone-2-carboxylic acid methyl ester (7), Eleutherinone (8), Kadsuric acid (9).
  
  
  CONCLUSIONS
  Compound 9 is isolated from the plant for the first time.
authors.affiliation: Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China. lxj_1975@yahoo.com.cn
authors.forename: Xi-jing
authors.initials: XJ
authors.lastname: Liu
authors.forename: Xi-qing
authors.initials: XQ
authors.lastname: Yan
authors.forename: Nai-li
authors.initials: NL
authors.lastname: Wang
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D027621:Iridaceae / Q000737:chemistry*; D015394:Molecular Structure; D009285:Naphthoquinones / Q000737:chemistry / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D012855:Sitosterols / Q000737:chemistry / Q000302:isolation & purification; D013055:Spectrophotometry, Infrared
chemical_list: D000880:Anthraquinones; D009285:Naphthoquinones; D012855:Sitosterols; C478365:eleutherinone