6-[3-benzyloxymethoxy-2-(4-methoxy-benzyloxy)-butyl]-2-[3-(6-{6-[4-hydroxy-2-(4-methoxy-benzyloxy)-butyl]-4-methylene-tetrahydro-pyran-2-ylmethyl}-4-methylene-tetrahydro-pyran-2-yl)-1,1-dimethyl-allyl]-2-methoxy-tetrahydro-pyran-3-ol