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

Abstract

A new triterpenol xyloside, beesioside II (2), mp 149-151°C, [α]_D +9.3°, C₃₉H₆₂O<12>·0.5H₂O, from the dried rhizomes of Beesia calthaefolia MAXIM. (Ranunculaceae), was identified as(20S, 24R)-16β, 18-diacetoxy-20, 24-epoxy-9, 19-cyclolanostane-3β, 15α, 25-triol 3-O-β-D-xylopyranoside on the basis of chemical and physicochemical evidence. The structure of 2 was confirmed by an X-ray structure analysis of a derivative.