Acetic acid (3aR,4R,6aS)-2-oxo-3,3a,4,6a-tetrahydro-2H-cyclopenta[b]furan-4-ylmethyl ester

[4aS,5Z,7S,7aR]-7-methyl-4,4a,7,7a-tetrahydro-1H-cyclopenta[c]pyran-3-one

[3aR,4R,5S,6aS]-4-hydroxymethyl-5-methyl-hexahydro-cyclopenta[b]furan-2-one

[3aR,4S,5R,6R,6aR]-4-hydroxymethyl-6-iodo-5-methyl-hexahydro-cyclopenta[b]furan-2-one

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