(12Z,16E)-(3S,5R,6S,7S,8S,15S)-15-Acetoxy-7-benzyloxy-3-(tert-butyl-dimethyl-silanyloxy)-5-hydroxy-4,4,6,8,16-pentamethyl-17-(2-methyl-thiazol-4-yl)-heptadeca-12,16-dienoic acid isopropyl ester