19.ALPHA.-Hydroxyursane-type triterpene glucosyl esters from the roots of Rubus suavissimus S. Lee.

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Abstract
No diterpene glycoside was isolated from the roots of Rubus suavissimus S. LEE, in contrast to its leaves, which taste sweet and contain a large amount of the sweet diterpene glucoside named rubusoside. Instead, a new 28-β-gluchopyranosyl ester of 2α, 3β, 19α-trihydroxyurs-12-ene-23, 28-dioic acid named suavissimoside F1 was isolated from the roots of this plant, along with niga-ichigoside F1 (28-β-glucopyranosyl ester of 19α-hydroxyasiatic acid) which has already been obtained from leaves of other Rubus spp.

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