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Structures of ryobunins A-C from the leaves of Clethra barbinervis
Sachiko Sugimoto1, Katsuyoshi Matsunami, Hideaki Otsuka
1Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
Abstract:
From a MeOH extract of the leaves of Clethra barbinervis Sieb. et Zucc., ryobunins A-C, three new triterpene glucosides, i.e. one ursane, one seco-ursane and one oleanane-type glucoside, along with four known compounds were isolated. Their structures were elucidated based on chemical and spectral evidence.
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