Two New Eudesmane Sesquiterpenoids from the Flowers of Chrysanthemum indicum

The plants of Asteraceae family, which contains 25 000–30 000 species belonging to over 1000 genera, have been considered as rich sources of eudesmane sesquiterpenoids [ 1 ]. Till now there have been over 1000 naturally occurring eudesmane sesquiterpenoids identified from the Asteraceae family, and these plant metabolites possessed diverse oxygenation and cleavage patterns [ 2 ]. Eudesmane-type sesquiterpenoids exhibit a wide range of biological activities, such as plant growth regulating, insect antifeedant, antifungal, anti-tumour, antibacterial, and antiviral activities [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Due to these, eudesmane-type sesquiterpenoids have long been the research focus of the phytochemists and pharmacologists.