A new flavonoid from the bark of Ulmus pumila L

Abstract A new flavonoid (6), together with eight (1–5 and 7–9) known flavonoids, were isolated from the n-butyl alcohol soluble portion of the EtOH extract of Ulmus pumila L. The chemical structures of the compounds were determined by using spectroscopic methods and further supported by comparison with previously literature values. Among them, flavonoids 4, 6 and 9 were isolated for the first time from the family Ulmaceae. Furthermore, the chemotaxonomic significance of the isolates was also discussed.