title: [Chemical constituents from the root of Rubus chroosepalus].
abstract: OBJECTIVE
  To investigate the chemical constituents of Rubus chroosepalus Focke.
  
  
  METHODS
  The methanol extracts were suspended in H2O and then extracted with EtOAc. Column chromatography was used for separation and purification, while spectral analysis was used for identification.
  
  
  RESULTS
  Seven compounds were isolated and identified as 2 alpha, 3 beta-dihydroxy-urs-12, 19-dien-23, 28-oic acid (I), 2 alpha, 3 beta, 23-trihydroxy-urs-12,18-dien-28-oic acid (IIa), 2 alpha, 3 beta, 23-trihydroxy-urs-12,19-dien-28-oic acid (IIb), 2 alpha, 3 alpha-dihydroxy-urs-12,18-dien-28-oic acid (IIIa), 2 alpha, 3 alpha-dihydroxy-urs-12,19-dien-28-oic acid (IIIb), and the acetonide of IIIa and IIIb (IVa and IVb).
  
  
  CONCLUSIONS
  I was found to be a new pentacyclic triterpenoid acid.
authors.affiliation: Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
authors.forename: R
authors.initials: R
authors.lastname: Liu
authors.forename: L S
authors.initials: LS
authors.lastname: Ding
authors.forename: N Y
authors.initials: NY
authors.lastname: Chen
authors.forename: M K
authors.initials: MK
authors.lastname: Wang
mesh_terms: D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D027824:Rosaceae / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C476214:2alpha,3beta-dihydroxy-urs-12,19-dien-23,28-oic acid; D014315:Triterpenes