[3aR,4R,5S,6aS]-3-hydroxymethylene-5-methyl-4-(2-trimethylsilanylethoxymethoxymethyl)hexahydro-cyclopenta[b]furan-2-one

[3E,3aS,4R,5S,6aS]-5-methyl-4-(2-trimethylsilanylethoxymethoxymethyl)-3-([2R,3R,4S,5R,6R]-3,4,5-trisbenzyloxy-6-benzyloxymethyl-tetrahydropyran-2-yloxymethylene)hexahydro-cyclopenta[b]furan-2-one