Cytotoxic sesquiterpene lactones from Artemisia myriantha

Abstract Chemical exploration of Artemisia myriantha Wall. ex Bess (Asteraceae) aerial parts afforded one new seco-guaianolide (1) and one new germacranolide (2). Structure elucidation of the new compounds was unambiguously performed based on HRESIMS, 1D and 2D NMR spectroscopic analyses. The two new compounds exhibited in vitro strong cytotoxic activities against human cancer cell lines HCT-8 with IC50 values of 0.76 and 0.28 μM, respectively.