Acetylated triterpene saponins from the Thai medicinal plant, Sapindus emarginatus

From the pericarps of Sapindus emarginatus (Sapindaceae), three new acetylated triterpene saponins were isolated together with hederagenin and five known triterpene saponins, as well as one known sweet acyclic sesquiterpene glycoside, mukurozioside IIb. The structures of new compounds were elucidated as hederagenin 3-O-(2-0-accetyl-beta -D-xylopyranosyl)-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-alpha -L-arabinopyranoside, 23-O-acetyl-hederagenin 3-O-(4-O-acetyl-beta -D-xylopyranosyl)-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-alpha -l-arabinopyranoside and oleanolic acid 3-O-(4-O-acetyl-beta -d-xylopyranosyl)-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-alpha -L-arabinopyranoside by chemical and spectroscopic data.