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