title: Guayulins C and D from guayule (Parthenium argentatum).
mesh_terms: D052176:Azulenes; D055598:Chemical Phenomena; D002621:Chemistry; D010944:Plants / Q000032:analysis*; D012408:Rubber / Q000032:analysis*; D012717:Sesquiterpenes / Q000302:isolation & purification*
chemical_list: D052176:Azulenes; D012717:Sesquiterpenes; C052080:guayulin C; C052081:guayulin D; D012408:Rubber