(diethoxy-phosphoryl)-acetic acid 4-{6-[4,8-bis-(tert-butyl-dimethyl-silanyloxy)-6-methyl-octa-2,6-dienyl]-4-methylene-tetrahydro-pyran-2-yl}-1-[2-(3,4-dimethoxy-benzyloxy)-1-(4-methoxy-benzyloxy)-ethyl]-3-methyl-but-3-enyl ester