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Further isolation work on the water-soluble fraction of a MeOH extract of Tricalysia dubia afforded one new megastigmane gentiobioside, named tricalysionoside A (1), and three sulfates, named sulfatricalysines A-C (2-4). Extensive isolation work on the 1-BuOH-soluble fraction of a MeOH extract of T. dubia yielded sulfatricalysines D-F (5-7) and three new ent-kaurane glucosides, named tricalysiosides X-Z (8-10). The structures of the new compounds were elucidated by analyses of one- and two-dimensional NMR spectroscopic data. The absolute stereochemistry of tricalysionoside A (1) was established by modified Mosher's method.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Tricalysionoside A, a Megastigmane Gentiobioside, Sulfatricalysines A-F, and Tricalysiosides X-Z, ent-Kaurane Glucosides, from the Leaves of Tricalysia dubia