title: New guaianolides from Centaurea kandavanensis.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D010946:Plants, Medicinal / Q000032:analysis*; D011763:Pyrrolizidine Alkaloids / Q000302:isolation & purification*
chemical_list: D011763:Pyrrolizidine Alkaloids; C009237:senecionine