Synonyms: NSC290497;9-Hydroxyparthenolide;9-.beta.-Hydroxyparthenolide;9-.alpha.-Hydroxyparthenolide;NSC672115;NSC672136;PARTHENOLIDE, 9-HYDROXY;78146-51-7;NSC-290497;6-Hydroxy-1a,5-dimethyl-8-methylene-2,3,6,7,7a,8,10a,10b-octahydrooxireno[2',3':9,10]cyclodeca[1,2-b]furan-9(1aH)-one;Oxireno[9,2-b]furan-9(1aH)-one, 2,3,6,7,7a,8,10a,10b-octahydro-6-hydroxy-1a,5-dimethyl-8-methylene-, [1aR-(1aR*,4E,6R*,7aS*,10aS*,10bR*)]-