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 9-.Alpha.-Hydroxyparthenolide 9-.Beta.-Hydroxyparthenolide AIDS-161120 AIDS161120 NSC672115 NSC672136