(3S,6R,7S,8S)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-4,4,6,8,12-pentamethyl-5-oxo-tridec-12-enoic acid (S)-1-(2-methyl-benzooxazol-5-yl)-but-3-enyl ester

(1S)-1-[(E)-1-Methyl-2-(2-methyl-1,3-thiazol-4-yl)-1-ethenyl]-3-butenyl (3S,6R,7S,8S)-3,7-di-[tert-butyldimethylsilyloxy]-4,4,6,8,12-pentamethyl-5-oxo-12-tridecenoate