(1S,2S,4aR,8S,8aS)-8-acetoxy-1-<(3'S,5'R)-3'-acetoxy-7'-(tert-butyldiphenylsiloxy)-5'-(tetrahydropyran-2-yloxy)heptyl>-2-methyl-1,2,4a,5,6,7,8,8a-octahydronaphthalene