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The methanolic extract from the flower buds of Chinese tea plant (Camellia sinensis (L.) O. KUNTZE) was found to inhibit release of beta-hexosaminidase from RBL-2H3 cells. From the methanolic extract, six new acylated oleanane-type triterpene oligoglycosides, floratheasaponins D-I, were isolated together with 21 known compounds including floratheasaponins A-C. The chemical structures of floratheasaponins D-I were elucidated on the basis of chemical and physicochemical evidence. The principal constituents, floratheasaponins A-F, were found to show the inhibitory activity on the release of beta-hexosaminidase from RBL-2H3 cells.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Medicinal Flowers. XIV.1) New Acylated Oleanane-Type Triterpene Oligoglycosides with Antiallergic Activity from Flower Buds of Chinese Tea Plant (Camellia sinensis)