Studies on the Constituents of Beesia calthaefolia and Souliea vaginata. IV. Beesioside I, a Cyclolanostanol Xyloside from the Rhizomes of Beesia calthaefolia

Abstract

A new triterpenol xyloside, beesioside I was isolated from the rhizomes of Beesia calthaefolia, and the structure was elucidated as (20S, 24S)-15β, 16β-diacetoxy-18, 24;20, 24-diepoxy-9, 19-cyclolanostane-3β, 25-diol 3-O-β-D-xylopyranoside on the basis of chemical and physicochemical evidence, including nuclear Overhauser effect spectroscopy experiment.