(3S,6R,7S,8S)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-9-{3-[(E)-(S)-3-(tert-butyl-dimethyl-silanyloxy)-4-methyl-5-(2-methyl-thiazol-4-yl)-pent-4-enyl]-phenyl}-4,4,6,8-tetramethyl-5-oxo-nonanoic acid