The extracts of Inula britannica have anti-inflammatory, anti-bacterial, anti-hepatitic, and anti- tumor activities. Various sesquiterpene lactones with cytotoxic properties including 1-O- acetylbritannilactone (1) have been isolated from this Chinese medicinal plant. Eight derivatives of 1-O-acetylbritannilactone,(2-O-alkyloxime-3-phenyl)-propionyl-1-O- acetylbritannilactone esters were designed and synthesized. Four of these compounds ...