A triterpenoid saponin isolated from Lafoensia glyptocarpa

From the leaves of Lafoensia glyptocarpa Koehne (Lytraceae) was isolated a triterpenoid saponin, 3β- O -β- l -arabnopyranosylolean-12-en-28-oic acid 28- O -β- d -glucopyranosyl ester, along with the known compound 3β- O -β- d -glucopyranosylsitosterol. The structures of both compounds were elucidated with spectral data of the natural products and their acetyl derivatives, including 2D NMR spectroscopic experiments.