title: Triterpenoid saponins from Pterocephalus hookeri.
abstract: Four new triterpenoid saponins, named hookerosides A-D, were isolated from Pterocephalus hookeri. Based on chemical and spectral evidence, their structures were determined as 3-O-beta-D-glucopyranosyl(1-->4)-beta-D-xylopyranosyl(1-->3)-alpha-L- Rhamnopyranosyl(1-->2)-beta-D-xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside, 3-O-beta-D-xylopyranosyl(1-->4)-beta-D-glucopyranosyl(1-->4)-beta-D- xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->2)-beta-D-xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside, 3-O-alpha-L-rhamnopyranosyl(1-->2)-beta-D-xylopyranosyl(1-->4)-beta-D- glucopyranosyl(1-->4)-beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosy l(1-->2 ) beta-D-xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl(1-->6)-beta-glucopyranoside and oleanolic acid 3-O-alpha-L-rhamnopyranosyl(1-->2)-beta-D- xylopyranosyl(1-->4)-beta-D-glucopyranosyl(1-->4)-beta-D-xylopyranosyl(1 -->3)- alpha-L-rhamnopyranosyl(1-->2)-beta-D-xylopyranoside, respectively.
authors.affiliation: Chengdu Institute of Biology, Academia Sinica, China.
authors.forename: J
authors.initials: J
authors.lastname: Tian
authors.forename: F E
authors.initials: FE
authors.lastname: Wu
authors.forename: M H
authors.initials: MH
authors.lastname: Qiu
authors.forename: R L
authors.initials: RL
authors.lastname: Nie
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010944:Plants / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D014315:Triterpenes