(10E,14E,16E)(5S,6R,7R,8R,9R,13R)-13-(tert-butyldimethyl-silanyloxy)-5-hydroxy-17-iodo-9-methoxy-6,8,11-trimethyl-3-oxo-7-triethylsilanyloxy-heptadeca-10,14,16-trienoic acid methyl ester