Triterpenoid saponins from the pericarps of sapindus mukorossi

A novel acetylated triterpene bisdesmoside saponin is elucidated as named hederagenin 3-o - l-rhamnopyranosyl (3 → 1)-[2,4-o-diacetyl - l-arabinopyranosyl]-28-o - d-glucopyranosyl-(2 → 1) [3-o-acetyl - d-glucopyranosyl] ester (1) along with two known saponins,hederagenin 3-o-(-l-arabinopyranoside-(1 → 3) - l-rhamnopyranosyl-(12) - l-arabinopyranoside (2) and hederagenin 3-o-[-d-xylopyranosyl-(1 → 3) - l-rhamnopyranosyl-(1 → 2) - l-arabinopyranoside] (3),from the pericarps of sapindus mukorossi. the structures of these saponins were characterized by means of chemical and spectral methods including advanced 2d nmr studies.