{(2S,5R,6R,8R,10R)-10-[1,3]Dithian-2-ylmethyl-2-[6-(4-methoxy-benzyloxy)-2-methylene-hexyl]-5-methyl-1,7,9-trioxa-dispiro[5.1.5.2]pentadec-5-yloxy}-triethyl-silane