(2S,3aS,6aR,7R,8R,8bR,9aR,11R,11aR)-8-((tert-butyldimethylsilyl)oxy)-2-hydroxy-2,7,9,9,11-pentamethyl-11a-((trimethylsilyl)oxy)-2,3,6a,7,8,8a,8b,9,9a,10,11,11a-dodecahydro-cyclopropa[5',6']benzo[1',2':7,8]azuleno[3a,4-d][1,3]dioxol-5-one