Isolation, Characterization, and Nuclear Magnetic Resonance Spectra of New Saponins from the Roots of Bupleurum falcatum L.

A systematic separation of a saponin fraction of the root of Bupleurum falcatum L. furnished seven new saponins, i.e., five monoacetylsaikosaponins (15-18, 20) and saikosaponins-e (19) and -f (21), besides the known saikosaponins-a, -b2, -b4, -c, and -d. α-Spinasteryl β-D-glucoside (22) was also isolated. The structures of these new saponins were determined by means of carbon-13 nuclear magnetic resonance spectroscopy.