抄録
A piscicidal saponin mixture (named boninsaponin) isolated from the bark of Schima mertensiana KOIDZ. (syn. S. boninensis NAKAI, Theaceae) was treated with alkali and the major desacylated product of boninsaponin was isolated and designated as desacyl-bonin-saponin A. On the basis of chemical (including the photolytic cleavage of the glucuronopyranoside linkage) and physicochemical evidence, the structure of desacyl-boninsaponin A has been determined as A1-barrigenol (3)-[β-D-glucopyranosyl (1glu→2glr)] [α-L-rhamnopyranosyl-(1rham→2gal)-β-D-galactopyranosyl (1gal→4glr)]-β-D-glucuronopyranoside (9a), in which the structure of oligosaccharide portion is identical with that of desacyl-jegosaponin obtained from the pericarps of Styrax japonica SIEB. et ZUCC. (Styracaceae).
