(3R,4S,5R)-3,5-bis(tert-butyldimethylsilyloxy)-4-[2-(tert-butyldimethylsilyloxy)ethoxy]oct-1-en-7-yne

(2S,3S,4S,5S,6S)-6-Bromomethyl-5-(tert-butyl-dimethyl-silanyloxy)-4-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-2-methoxy-tetrahydro-pyran-3-ol