(diethoxy-phosphoryl)-acetic acid 1-{7-[6-(tert-butyl-dimethyl-silanyloxy)-4-(2-hydroxy-ethyl)-tetrahydro-pyran-2-yl]-3-methyl-2-triisopropylsilanyloxy-octa-3,5-dienyl}-3-methoxy-2,4,8-trimethyl-9-(2-methyl-oxazol-4-yl)-nona-4,6,8-trienyl ester