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Two new acylated oleanene-type triterpene oligoglycosides, theasaponins E1 and E2, were isolated from the seeds of tea plant [Camellia sinensis (L.) O. Kuntze]. The structures of theasaponins E1 and E2 were elucidated on the basis of chemical and physicochemical evidence to be expressed as 21-O-angeloyl-22-O-acetyltheasapogenol E 3-O-[beta-D-galactopyranosyl(1--&gt;2])[beta-D-xylopyranosyl(1--&gt;2)-alpha-L - arabinopyranosyl (1--&gt;3)]-beta-D-glucopyranosiduronic acid and 21-O-angeloyl-28-O-acetyltheasapogenol E 3-O-[beta-D-galactopyranosyl(1--&gt;2)][beta-D-xylopyranosyl (1--&gt;2)-alpha-L-arabinopyranosyl (1--&gt;3)-beta-D-glucopyranosiduronic acid, respectively. Theasaponin E1 was found to show antisweet activity.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Structures of New Acylated Oleanene-Type Triterpene Oligoglycosides, Theasaponins E1 and E2, from the Seeds of Tea Plant, Camellia sinensis (L.) O. KUNTZE.