(6S,7S,12R,E)-12-((2S,6R,E)-6-((4R,6R)-2,2-di-tert-butyl-6-methyl-1,3,2-dioxasilinan-4-yl)-4-methylhept-4-en-2-yl)-7,9-dimethyl-6-(triethylsilyloxy)oxacyclododec-9-en-2-one