1a,5-Dimethyl-8-methylene-9-oxo-1a,2,3,6,7,7a,8,9,10a,10b-decahydrooxireno[9,10]cyclodeca[1,2-b]furan-6-yl acetate 55249-44-0 AIDS-014903 AIDS014903 NSC292657 NSC672116 Parthenolide, 9b-Acetoxy-