https://pubmed.ncbi.nlm.nih.gov/18066118/
Xanthatin and xanthinosin from the burs of Xanthium strumarium L. as potential anticancer agents
Xanthatin and xanthinosin, 2 sesquiterpene lactones isolated from the burs of Xanthiun strumarium L. (cocklebur), showed moderate to high in vitro cytotoxic...