Bioactive Saponins and Glycosides. XXVI. New Triterpene Saponins, Theasaponins E10, E11, E12, E13, and G2, from the Seeds of Tea Plant (Camellia sinensis)

New triterpene saponins, theasaponins E 10 , E 11 , E 12 , E 13 , and G 2 , were isolated from the saponin fraction of the seeds of Camellia sinesis. Their stereostructures were elucidated on the basis of chemical and physicochemical evidence.