Chemical constituents of triterpenoid saponins from Glycyrrhiza glabra

Ten triterpenoid saponins were isolated and purified from the water extract of Glycyrrhiza glabra by polyamide resin combined with macroporous resin column chromatography, ODS medium pressure column chromatography and semi-preparative RP-HPLC. Their structures were elucidated by physicochemical properties, NMR and MS spectra, and determined as 3β-O-β-D-glucuronpyranosyl-(1→2)-β-D-glucuronpyranosyl-30β-O-β-D-glucuronpyranosyl-oleanane-11-oxo-12(13)-ene (1), 3β-O-β-D-glucuronpyranosyl-(1→2)-β-D-glucuronpyranosyl-30β-O-α-L-rhamnopyranosyl-oleanane-11-oxo-12(13)-en-22β,30-diol (2), uralsaponin C (3), licorice-saponin A3 (4), licorice-saponin P2 (5), 22β-acetoxyl-glycyrrhizin (6), macedonoside A (7), 29-hydroxyl-glycyrrhizin (8), licorice-saponin G2 (9), glycyrrhizin (10). Compounds 1 and 2 are two new compounds and named as licorice-saponin R3 and licorice-saponin S3.