Macrophyllosaponin E: A novel compound from the roots of Astragalus oleifolius

Macrophyllosaponin E, a novel cycloartane-type triterpene, has been isolate d from the roots of Astragalus oleifolius. The structure elucidation of the compound was achieved by a combination of one- and two-dimensional NMR tec hniques [H-1-H-1-correlation spectroscopy (COSY), H-1-C-13-heteronuclear mu ltiple guantum correlation spectroscopy (HMQC), and H-1-C-13-heteronuclear multiple-bond correlation spectroscopy (HMBC)] and high resolution electros pray ionization Fourier transformation mass spectrometry (HR-ESI-FT-MS).