scandenolide

(1aS,3S,7R,7aR,10aS,11aS)-3-Acetoxy-1a,2,3,7a,8,10a,11,11a-octahydro-11a-methyl-8-methylene-5H-7,4-methenofuro[3,2-c]oxireno[f]oxacycloundecin-5,9(7H)-dione