title: Sesquiterpene lactones. IX. The search for sesquiterpene lactones in the species of genera Ursinia, Venidium, and Arctotis.
mesh_terms: D003460:Crystallization; D007783:Lactones / Q000302:isolation & purification; D010946:Plants, Medicinal / Q000032:analysis*; D012717:Sesquiterpenes / Q000302:isolation & purification*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D007783:Lactones; D012717:Sesquiterpenes