title: Asteryunnanosides F and G: two new triterpenoid saponins from Aster yunnanensis.
abstract: Two new triterpenoid saponins, aster-yunnanosides F and G, were isolated from the roots of Aster-yunnanensis. Their structures were determined as oleanolic acid-28-O-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside and 3-O-beta-glucopyranosyloleanolic acid-28-O-beta-D-glucopyranosyl-(1-->6)-[alpha-L-rhamnopyranosyl-(1-->2) ]- beta-D-glucopyranoside by spectral data, especially 2D NMR analysis including COSY, HETCOR, HOHAHA, and ROESY techniques, and chemical transformation.
mesh_terms: D002240:Carbohydrate Sequence; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000031:analogs & derivatives*; D018517:Plant Roots / Q000737:chemistry; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D012503:Saponins; C096569:asteryunnanoside F; C096570:asteryunnanoside G; D009828:Oleanolic Acid