A Xanthone Dixylopyranoside from Swertia thomsonii

Abstract

A xanthone dixylopyranoside has been isolated from Swertia thomsonii C. B. Clarke and its structure established as 1,7-dihydroxy-3,8-dimethoxyxanthone 1-O-[β-D-xylopyranosyl- (1→4)D-xylopyranoside on the basis of spectral evidence, particularly 2D NMR studies. Three known compounds, 1,7-dihydroxy-3,8-dimethoxyxanthone, swertianin (1,7,8-trihydroxy- 3-methoxy-xanthone) and ursolic acid were also isolated from this species.