(5Z,8S)-8-(tert-butyldimethylsilyloxy)-8-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-1-(trimethylsilyl)oct-5-en-1-yn-3-ol

Ethyl (5S,6R)-5-tert-Butyldiphenylsilyloxy-6,7-O-isopropylideneheptanoate