A New Alcohol Glycoside from the Leaves of Panax vietnamensis

Vietnamese ginseng (Panax vietnamensis), one of the famous Panax genus, is distributed and cultivated in the central area of Vietnam. This study investigates the chemical profile of the leaf part of the title plant, and has led to the isolation of one new alcohol glycoside and four ginsenosides. The structures of the obtained compounds were established as (2S)-pentyl-2-ol 2-O-β-D-apiofuranosyl-(1→6)-β-D- glucopyranoside (1, new compound), vina-ginsenoside R24 (2), ginsenoside Rg1 (3), ginsenoside Rb1 (4), and ginsenoside Rd (5), respectively, by extensive spectroscopic analyses, including NMR spectroscopy and mass spectrometry, as well as comparison with the literature data.