(7S,8R,9S)-9-(tert-Butyl-diphenyl-silanyloxymethyl)-8-[(Z)-4-(4-methyl-2,6,7-trioxa-bicyclo[2.2.2]oct-1-yl)-but-2-enyl]-1,4-dithia-spiro[4.4]nonan-7-ol

1-[6-[(tert-butyldimethylsilyl)oxy]-(5R)-(2-propenyloxy)-(2Z)-hexenyl]-4-methyl-2,6,7-trioxabicyclo[2.2.2]octane