(3aS,4E,7S,11S,12aS,13aS,14E,15aS)-11-((1S,3R)-1-((tert-butyldimethylsilyl)oxy)-4-hydroxy-3-methylbutyl)-2,2,7-trimethyl-6,7,8,11,12,12a,13a,15a-octahydro-[1,3]dioxolo[4,5-h]oxireno[2,3-d][1]oxacyclopentadecin-9(3aH)-one