title: [Chemical constituents of Knoxia valerianoides].
abstract: OBJECTIVE
  To study the chemical constituents of Knoxia valerianoides Thorel et Pitard.
  
  
  METHODS
  Chromatographic methods were used for the isolation and purification. Structures were elucidated on the basis of chemical analysis and spectroscopic data.
  
  
  RESULTS
  Three anthraguinones were isolated from K. valerianoides and identified as 1, 3, 5-trihydroxy-2-methyl-6-methoxyl-anthraguinone (kaoxiadin, I), 1, 3, 6-trihydroxy-5-ethoxylmethyl-anthraguinone (II) and 1, 3-dihydroxy-2-methylanthraguinone (rubiadin, III).
  
  
  CONCLUSIONS
  Compound II is a new anthraguinone constituent.
authors.affiliation: Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing 100850, China.
authors.forename: Shan-qin
authors.initials: SQ
authors.lastname: Yuan
authors.forename: Yi-min
authors.initials: YM
authors.lastname: Zhao
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D035281:Plant Tubers / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D019666:Rubiaceae / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; C526424:kaoxiadin; C072500:rubiadin