A New Oleanane-Type Triterpene Glycoside from Nephelium lappaceum

A new oleanane-type triterpene glycoside, 3-O-alpha-L-arabinopyranosyl-(1 -> 3)-alpha-L-rhamnopyranosyl-(1 -> 2)-alpha-L-arabinopyranosyloleanolic acid 28-O-beta-D-xylopyranosyl-(1 -> 3)-beta-D-xylopyranosyl-(1 -> 2)-beta-D-glucopyranosyl ester, was isolated from the aqueous-ethanolic extract of the seeds of Nephelium lappaceum L. The structure elucidation of this compound was based on analyses of spectroscopic data, including 1D and 2D NMR and HR-ESI-MS techniques, and by comparing their NMR data with those reported in the literature.