New sesquiterpene derivatives from stems and leaves of <i>Smallanthus sonchifolius</i>

From the MeOH residue of <i>Smallanthus sonchifolius</i> stems and leaves, three new sesquiterpene derivatives, namely smallantholides A − C (<b>1 </b>−<b> 3</b>), and two know phenyl propanoid glycosides (<b>4</b> and <b>5</b>), were isolated using various chromatographic techniques. The structural elucidation was confirmed by spectroscopic methods including 1D, 2D NMR, CD and HR-TOF-MS. Moreover, the <i>in vitro α</i>-glucosidase inhibitory activity of <b>1 </b>−<b> 5</b> was also evaluated.