title: [Isolation and identification of a new cucurbitacin from Picria fel-terrae].
abstract: OBJECTIVE
  To study compounds isolated from Picria fel-terrae.
  
  
  METHODS
  The chemical constituents were separated and purified by column chromatography on silica gel and MCI. Their structures were identified on the basis of spectral data (IR, UV, MS, ID NMR and 2D NMR).
  
  
  RESULTS
  A new cucurbitacin, along with a known one, were obtained from the 60% EtOH extract of the whole plant.
  
  
  CONCLUSIONS
  The new compound was identified as 11, 24-dioxo-5, 21-diene-cucurbit-3alpha-O-beta-D-xylopyranosyl-16alpha-O-alpha-L-rhamnopyranoside (dehydrobryogenin glycoside). The known one, hexanorcucurbitacin F, was obtained for the first time from Picria fel-terrae.
authors.affiliation: Guilin Sanjin Pharmaceutical Co. Ltd., Guilin 541004, China. Sanjin@gl.gx.cninfo.net
authors.forename: Jie-Ming
authors.initials: JM
authors.lastname: Zou
authors.forename: Li-Sheng
authors.initials: LS
authors.lastname: Wang
authors.forename: Xue-Min
authors.initials: XM
authors.lastname: Ma
authors.forename: Ren-Bing
authors.initials: RB
authors.lastname: Shi
authors.forename: Ya-Jian
authors.initials: YJ
authors.lastname: Guo
mesh_terms: D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D028083:Scrophulariaceae / Q000737:chemistry*; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification
chemical_list: C502281:11,24-dioxo-5,21-dienecucurbit-3-O-xylopyranosyl-16-O-rhamnopyranoside; D012503:Saponins; D013256:Steroids; C502282:hexanorcucurbitacin F