Saponins from Albizzia lucida.

Three main saponins were isolated from the seeds of Albizzia lucida. Their structures were established by spectral analyses and chemical and enzymatic transformations as 3-O-[beta-D-xylopyranosyl(1----2)-alpha-L-arabinopyranosyl (1----6)] [beta-D-glucopyranosyl (1----2)] beta-D-glucopyranosyl echinocystic acid; 3-O-[alpha-L-arabinopyranosyl (1----6)] [beta-D-glucopyranosyl (1----2)]-beta-D-glucopyranosyl echinocystic acid and 3-O-[beta-D-xylopyranosyl (1----2)-beta-D-fucopyranosyl (1----6)-2-acetamido-2-deoxy-beta-D-glucopyranosyl echinocystic acid, characterized as its methyl ester.