title: Triterpene saponins from Aster yunnanensis.
abstract: Four new triterpene saponins, asteryunnanosides A, B, C and D, have been isolated from Aster yunnanensis and their structures deduced as 2 alpha,3 beta,23-trihydroxyolean-12-en-28-oic acid-28-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranoside, 2 alpha,3 beta,23-trihydroxyolean-12-en-28-oic acid-28-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside, 2 alpha,3 beta-dihydroxyolean-12-en-28-oic acid-28-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-glucopyranoside and 2 alpha,3 beta-dihydroxyolean-12-en-28-oic acid-28-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside, respectively, by means of spectral and chemical data.
authors.affiliation: Shanghai Institute of Materia Medica, Academia Sinica, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Shao
authors.forename: B N
authors.initials: BN
authors.lastname: Zhou
authors.forename: L Z
authors.initials: LZ
authors.lastname: Lin
authors.forename: G A
authors.initials: GA
authors.lastname: Cordell
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009904:Optical Rotation; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D004187:Disaccharides; D012503:Saponins; D014315:Triterpenes