Dihydroparthenolide

11βH,13-Dihydroparthenolide

(1aR,4E,7aS,8S,10aS,10bR)-2,3,6,7,7a,8,10a,10b-Octahydro-1a,5,8-trimethyloxireno[9,10]cyclodeca[1,2-b]furan-9(1aH)-one