1-{2-[(3S,4R,7S)-9-benzyloxy-4-(tert-butyldimethylsilyl)oxy-3-(4-methoxybenzyl)oxy-4-methyl-7-(triethylsilyloxy)nonyl]-1,3-dithian-2-yl}-4-hepten-6-one

2-[2-(benzyloxy)ethyl]-5-(tert-butyldimethylsilyl)oxy-10-[2-(tert-butyldimethylsilyl)oxy-7-(tert-butyldiphenylsilyloxymethyl)-3-methyl-6,8-dioxabicyclo[3.2.1]oct-5-ylmethyl]-5-methyl-1,7,9-trioxadispiro[5.1.5.2]pentadecane