X-ray crystallography of a new sesquiterpene lactone isolated from Inula britannica var. chinensis

Abstract

A sesquiterpene lactone, 1-O-acetyl-4R,6S-britannilactone (1) which has a new stereochemistry was isolated from the flowers of Inula britannica L. var. chinensis (Rupr.) Reg. Its stereostructure was determined by a x-ray crystallography.