Spiro[benzo[4,5]cyclodeca[1,2-b]furan-12(2H),2'-oxiran]-2-one,8,9,10,11,13-pentakis(acetyloxy)-4-chloro-1,3a,4,5,8,8a,9,10,11,12a,13,13a-dodecahydro-13a-hydroxy-1,8a-dimethyl-5-methylene-,[1R-(1R*,3aR*,4S*,6Z,8S*,8aS*,9R*,10R*,11R*,12R*,12aS*,13S*,13aR*)]-;(-)-Juncin E; Juncin E