Acetic acid (Z)-(1S,8S,9S,10R,11R)-9-(tert-butyl-dimethyl-silanyloxy)-13,13-dimethoxy-8,10,12,12-tetramethyl-1-[(E)-1-methyl-2-(2-methyl-thiazol-4-yl)-vinyl]-11-triphenylsilanyloxy-tridec-3-enyl ester