(Z)-(4S,7R,8S,9S,16S)-4,8-Bis-(tert-butyl-dimethyl-silanyloxy)-5,5,7,9,13-pentamethyl-16-(2-methyl-benzothiazol-5-yl)-oxacyclohexadec-13-ene-2,6-dione

(Z)-(3S,6R,7S,8S,15S)-3,7,15-Tris-(tert-butyl-dimethyl-silanyloxy)-4,4,6,8,12-pentamethyl-15-(2-methyl-benzothiazol-5-yl)-5-oxo-pentadec-12-enoic acid methyl ester