title: A new triterpenoid saponin from Albizia julibrissin Durazz.
abstract: A new triterpenoid, saponin hehuanoside A, was isolated together with the known triterpenoid saponins 2, 3, and 4 from the stem bark of Albizia julibrissin. With the help of chemical and spectral analyzes (IR, MS, 1D-NMR, and 2D-NMR), the structure of the new triterpenoid saponin was elucidated as 21-O-[(6S)-2-trans-2,6-dimethyl-6-O-beta-d-quinovopyranosyl-2,7-octadienoyl]-3-O-beta-d-xylopyranosyl-(1 --> 2)-beta-d-fucopyranosyl-(1 --> 6)-beta-d-2-deoxy-2-acetamidoglucopyrasyl acacic acid 28-O-alpha-l-arabinofuranosyl-(1 --> 4)-[-beta-d-glucopyranosyl-(1 --> 3)]-alpha-l-rhamnopyranosyl-(1 --> 2)-beta-d-glucopyranosyl ester (1). Three known triterpenoid saponins 2-4 were identified on the basis of spectroscopic data.
authors.affiliation: Department of Traditional Chinese Medicine Chemistry, School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
authors.forename: Tun-Hai
authors.initials: TH
authors.lastname: Xu
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Li
authors.forename: Ya-Juan
authors.initials: YJ
authors.lastname: Xu
authors.forename: Hong-Feng
authors.initials: HF
authors.lastname: Zhao
authors.forename: Sheng-Xu
authors.initials: SX
authors.lastname: Xie
authors.forename: Dong
authors.initials: D
authors.lastname: Han
authors.forename: Yun-Shan
authors.initials: YS
authors.lastname: Si
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Jian-Zhao
authors.initials: JZ
authors.lastname: Niu
authors.forename: Dong-Ming
authors.initials: DM
authors.lastname: Xu
mesh_terms: D031289:Albizzia / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D012503:Saponins / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry*
chemical_list: D012503:Saponins; D014315:Triterpenes; C532837:hehuanoside A