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

[2aS,4S,4aR,7R,7aS,7bS]-4-methyl-7-([2S,3R,4S,5R,6R]-3,4,5-trisbenzyloxy-6-benzyloxymethyl-tetrahydropyran-2-yloxy)octahydro-2,6-dioxa-cyclopenta[cd]inden-1-one