(7-{3-[7-benzyloxy-6-(2-benzyloxy-ethyl)-2,6,8a-trimethyl-2-vinyl-octahydro-pyrano[3,2-b]pyran-3-yloxy]-2-methyl-3-phenylsulfanyl-propyl}-10a-methyl-2-phenyl-octahydro-1,3,8,10-tetraoxa-anthracen-6-yloxy)-tert-butyl-dimethyl-silane