Structures of ryobunins A-C from the leaves of Clethra barbinervis

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. © 2013 The Pharmaceutical Society of Japan.