(((4aR,6R,8S,8aR)-octahydrospiro[isochromene-3,2'-[1,3]dithiane]-6,8-diyl)bis(oxy))bis(tert-butyldimethylsilane)

methyl (Z,3S,5R)-[3,5-bis(tert-butyldimethylsilyl)oxy-2-methylenecyclohexylidene]acetate