(3aS,3a1S,5aR,6S,6aR,9aS,9bS)-1,1,3a1,8,8-pentamethyl-6-((methylsulfinyl)methyl)decahydro-5H-furo[4',3',2':4,5]naphtho[1,2-d][1,3]dioxol-5-one