title: [Studies on constituents of Oldenlandia diffusa].
abstract: OBJECTIVE
  To investigate the chemical constituents of Oldenlandia diffusa.
  
  
  METHODS
  The column chromatography with polyamide Sephadex LH -20, silica gel as packing materials and HPLC, were used to separate and purify the chemical components. The structures were elucidated on the basis of physicochemical properties and spectral data.
  
  
  RESULTS
  Nine compounds were isolated and identified as 2, 6-dihydroxy-1-methoxy-3-methylanthraquinone (1), 2-hydroxy-1-methoxy-3-methylanthraquinone (2), 2-hydroxy-3-methylanthraquinone (3), quercetin-3-O-[2-O-(6-O-E-sinapoyl)-beta-D-glucopyranosyl]-beta-glucopyranoside (4), quercetin-3-O-[2-O-(6-O-E-feruloyl)-beta-D-glucopyranosyl]-beta-glucopyranoside (5), kaempferol-3-O-[2-O-(6-O-E-feruloyl)-beta-D-glucopyranosyl]-beta-galactopyranoside (6), quercetin-3-O-(2-O-beta-D-glucop-yranosyl)-beta-D-glucopyranoside (7), rutin (8) and quercertin (9).
  
  
  CONCLUSIONS
  Compounds 1 and 8 were obtained from this plant for the first time, and compound 1 was a new compound.
authors.affiliation: Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Central South University, Changsha 410013, China. yingjun-zhou@hotmail.com
authors.forename: Ying-Jun
authors.initials: YJ
authors.lastname: Zhou
authors.forename: Kong-Song
authors.initials: KS
authors.lastname: Wu
authors.forename: Guang-Yao
authors.initials: GY
authors.lastname: Zeng
authors.forename: Jian-Bing
authors.initials: JB
authors.lastname: Tan
authors.forename: Kang-Ping
authors.initials: KP
authors.lastname: Xu
authors.forename: Fu-Shuang
authors.initials: FS
authors.lastname: Li
authors.forename: Gui-Shan
authors.initials: GS
authors.lastname: Tan
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D032067:Oldenlandia / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000737:chemistry / Q000302:isolation & purification; D012431:Rutin / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C528664:2,6-dihydroxy-1-methoxy-3-methylanthraquinone; D000880:Anthraquinones; D012431:Rutin; D011794:Quercetin