title: Sesquiterpene lactones of Helenium tenuifolium nutt.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002845:Chromatography; D007783:Lactones / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010946:Plants, Medicinal / Q000032:analysis*; D012717:Sesquiterpenes / Q000302:isolation & purification*; D013055:Spectrophotometry, Infrared
chemical_list: D007783:Lactones; D012717:Sesquiterpenes