11-beta-H,13-Dihydroparthenolide 2513-76-0 AIDS-104088 AIDS104088 Oxireno[9,10]cyclodeca[1,2-b]furan-9(1aH)-one,2,3,6,7,7a,8,10a,10b-octahydro-1a,5,8-trimethyl-,[1aR*,4E,7aS*,8S*,10aS*,10bR*)]