A New Oleanane-Type Triterpene Glycoside from Nephelium lappaceum

A new oleanane-type triterpene glycoside, 3-O-α-L-arabinopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyloleanolic acid 28-O-β-D-xylopyranosyl-(1→3)-β-D-xylopyranosyl-(1→2)-β-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.