title: Structures of four new triterpenoid saponins from the leaves of Oplopanax elatus Nakai.
abstract: OBJECTIVE
  Isolation and structural elucidation of the triterpenoid saponins of Oplopanax elatus Nakai.
  
  
  METHODS
  Solvent extraction and column chromatography were used to isolate the triterpenoid saponins, physico-chemical constants and spectroscopic analysis were employed for structural elucidation.
  
  
  RESULTS
  Four newtriterpenoid saponins named cirenshenoside S (1), cirenshenoside T (2), cirenshenoside U (3) and cirenshenoside V (4) were isolated, and their structures were elucidated to be 3-O-beta-D-glucopyranosyl 3beta,23-dihydroxylup-20 (29)-en-28-oic acid 28-O-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-glucopyranosyl (1 --> 6)-beta-D-glucopyranoside (1), 3-O-beta-D-glucopyranosyl hederagenin 28-O-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-glucopyranosyl (1 --> 6)-beta-D-glucopyranoside (2), 3-O-beta-D-glucopyranosyl 3beta-hydroxyolean-9(11),12-dien-28-oic acid 28-O-alpha-L-rhamnopyranosyl (1 --> 4)-beta-D-glucopyranosyl (1 --> 6)-beta-D-glucopyranoside (3) and 3alpha-hydroxyolean-12-dien-23,28-dioic acid 28-O-alpha-L-rhamnopyranosyl (1 --> 4 )-beta-D-glucopyranosyl (1 --> 6)-beta-D-glucopyranoside (4), respectively.
  
  
  CONCLUSIONS
  Compounds 1-4 are new triterpenoid saponins and isolated from the leaves of Oplopanax elatus Nakai for the first time.
authors.affiliation: Pharmacy College, Jilin University, Changchun 130021, China. wangguangshu1001@163.com
authors.forename: Guang-shu
authors.initials: GS
authors.lastname: Wang
authors.forename: Xiao-hong
authors.initials: XH
authors.lastname: Yang
authors.forename: Jing-da
authors.initials: JD
authors.lastname: Xu
mesh_terms: D008968:Molecular Conformation; D015394:Molecular Structure; D028002:Oplopanax / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C493343:3-O-glucopyranosyl 3,23-dihydroxylup-20(29)-en-28-oic acid 28-O-rhamnopyranosyl-1-4-glucopyranosyl-1-6-glucopyranoside; C493344:3-O-glucopyranosyl 3-hydroxyolean-9(11),12-dien-28-oic acid 28-O-rhamnopyranosyl-1-4-glucopyranosyl-1-6-glucopyranoside; D012503:Saponins