(3S,6R,7S,8S,15S,12Z,16E)-1-[di-(4-methoxyphenyl)(phenyl)-methoxy]-3,7-bis-(tert-butyldimethylsilyloxy)-4,4,6,8,12,16-hexamethyl-17-(2-methyl-1,3-thiazol-4-yl)-15-(2-trimethylsilylethoxy)-methoxyheptadeca-12,16-dien-5-one