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Seven sesquiterpene lactones, chlorophyssopifolin E ( 1 ), aguerin B ( 2 ), repdiolide triol ( 3 ), solistitiolide ( 4 ), aitchisonolide ( 5 ), sinicin B ( 6 ), cynaropicrin ( 7 ), along with four lignans arctigenin ( 8 ), arctiin ( 9 ), matairesinol ( 10 ), and matairesinoside ( 11 ) were isolated for the first time from the aerial parts of  Cousinia turkmenorum  Bornm. Among the isolated compounds, aguerin B ( 2 ) showed the most cytotoxic activity against MCF7 cell lines with IC 50  value of 18.9 μM. Findings of this study could be useful for the development of new anticancer agents from nature.

Cytotoxic sesquiterpene lactones and lignans from Cousinia turkmenorum Bornm (Asteraceae)