Triterpenoid Saponins from the Pericarps of Sapindus mukorossi

A novel acetylated triterpene bisdesmoside saponin is elucidated as named Hederagenin 3‐O‐α‐L‐rhamnopyranosyl (3 → 1)‐[2,4‐O‐diacetyl‐α‐L‐arabinopyranosyl]‐28‐O‐β‐D‐glucopyranosyl‐(2 → 1) [3‐O‐acetyl‐β‐D‐glucopyranosyl] ester (1) along with two known saponins, hederagenin 3‐O‐(α‐L‐arabinopyranoside‐(1 → 3)‐α‐L‐rhamnopyranosyl‐(1→2)‐α‐L‐arabinopyranoside (2) and hederagenin 3‐O‐[β‐D‐xylopyranosyl‐(1 → 3)‐α‐L‐rhamnopyranosyl‐(1 → 2)‐α‐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.