title: Conyzasaponins I-Q, nine new triterpenoid daponins from Conyza blinii.
abstract: Nine new triterpenoid saponins, conyzasaponins I-Q (1-9), were isolated from the aerial parts of Conyza blinii. Their structures were established on the basis of extensive 1D and 2D NMR spectra as well as by chemical degradations. Among these compounds, conyzasaponins M-O (5-7) share a common pentasaccharide unit attached to C-28 of the aglycon, 28-O-beta-d-apiofuranosyl-(1-->3)-beta-d-xylopyranosyl-(1-->4)-[beta-d-apiofuranosyl-(1-->3)]-alpha-l-rhamnopyranosyl-(1-->2)-alpha-l-arabinopyranosyl ester, which contains two apiofuranosyl residues. To the best of our knowledge, they are among the few examples of natural products possessing two apiofuranose units in a single sugar chain.
authors.affiliation: School of Pharmaceutical Sciences, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Su
authors.forename: Kazuo
authors.initials: K
authors.lastname: Koike
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Nikaido
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Liu
authors.forename: Junhua
authors.initials: J
authors.lastname: Zheng
authors.forename: Dean
authors.initials: D
authors.lastname: Guo
mesh_terms: D035401:Conyza / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; D014315:Triterpenes