(2E,6Z)-(S)-5-(tert-Butyl-dimethyl-silanyloxy)-7-methoxy-hepta-2,6-dienoic acid methyl ester

(E)-(5S,7R,9S)-5-(tert-Butyl-dimethyl-silanyloxy)-10-{(2R,3S,6S)-6-[(E)-(R)-2-(tert-butyl-dimethyl-silanyloxy)-6-methyl-hept-3-enyl]-3-methyl-tetrahydro-pyran-2-yl}-7,9-dihydroxy-dec-2-enoic acid methyl ester