title: [Quinovic acid triterpenoid saponins from bark of Mitragyna rotundifolia].
abstract: OBJECTIVE
  To study the chemical constituents from the bark of Mitragyna rotundifolia.
  
  
  METHODS
  Column chromatographic techniques were applied to isolate constituents. A combination of IR, MS and NMR spectroscopy was used to identify structures of constituents.
  
  
  RESULTS
  Six compounds were isolated from the n-BuOH fraction and their structures were elucidated as quinovic acid-3-O-beta-D-6-deoxy-glucopyranoside, 28-O-beta-D-glucopyranosyl ester (1), quinovic acid-27-O-alpha-L-rhamnopyranosyl ester (2), quinovic acid-3-O-alpha-L-rhamnopyranoside (3), qunovic acid-27-O-beta-D-glucopyranosyl ester (4), quovic acid-3-O-beta-D-6-deoxy-glucopyranoside (5), qunovic acid-27-O-beta-6-deoxy-D-glucopyranosyl ester (6).
  
  
  CONCLUSIONS
  Compounds 1 - 6 were isolated for the first time from the plant. Compounds 1 - 4 and 6 were isolated for the first time form the genus.
authors.affiliation: Institute of Natural Products, Henan University, Kaifeng 475004, China. kangweny@hotmail.com
authors.forename: Wen-Yi
authors.initials: WY
authors.lastname: Kang
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Shi
authors.forename: Xiao-Jiang
authors.initials: XJ
authors.lastname: Hao
mesh_terms: D032065:Mitragyna / Q000737:chemistry*; D024301:Plant Bark / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D014315:Triterpenes; C533728:quinovic acid-3-O-beta-D-6-deoxy-glucopyranoside, 28-O-beta-D-glucopyranosyl ester; C472605:quinovic acid