title: Carolenin and carolenalin, two new guaianolides in Helenium autumnale L. from North Carolina.
mesh_terms: D007783:Lactones / Q000145:classification / Q000302:isolation & purification; D008961:Models, Structural; D009657:North Carolina; D010946:Plants, Medicinal / Q000032:analysis*; D012717:Sesquiterpenes; D013729:Terpenes / Q000145:classification / Q000302:isolation & purification*
chemical_list: D007783:Lactones; D012717:Sesquiterpenes; D013729:Terpenes; C004187:carolenalin; C004186:carolenin