title: [Chemical constituents from stems of Lonicera japonica].
abstract: OBJECTIVE
  To investigate the chemical constituents from the ethanol extract of the stems of Lonicera japonica.
  
  
  METHODS
  The constituents were isolated and purified by repeated column chromatography on silica gel, Sephadex LH-20 and MCI HP-20. Their structures were identified by phsicochemical properties and spectroscopic analysis.
  
  
  RESULTS
  Thirteen compounds were isolated and identified as protocatechuic acid (1), caffeic acid (2), macranthoin G (3), esculetin (4), luteolin (5), quercetin (6), apigenin (7), luteolin-7-O-beta-D-glucopyranoside (8), isorhamnetin-7-O-beta-D-glucopyranoside (9), diosmetin-7-O-beta-D-glucopyranoside (10), rhoifolin (11), lonicerin (12), hydnocarpin D (13).
  
  
  CONCLUSIONS
  Compound 4, 7, 9-11 were isolated from this plant for the first time, while compound 13 was first reported flavanolignan from this genus Lonicera.
authors.affiliation: Department of Phytochemistry, China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Zhang
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Yin
authors.forename: Wencai
authors.initials: W
authors.lastname: Ye
authors.forename: Yuzhen
authors.initials: Y
authors.lastname: Guan
authors.forename: Lian
authors.initials: L
authors.lastname: Guo
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Wenbin
authors.initials: W
authors.lastname: Shen
mesh_terms: D047311:Luteolin / Q000737:chemistry*; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification; D018547:Plant Stems / Q000737:chemistry
chemical_list: D010936:Plant Extracts; D047311:Luteolin