methyl (1R,5S,6R,7R)-6-(3-cyclopentyl-3-oxo-(E)-1-propenyl)-7-tetrahydropyranyloxybicyclo<3.3.0>oct-2-ene-3-pentanoate

5-[(3aS,5R,6R,6aS)-5-Hydroxy-6-((E)-3-oxo-oct-1-enyl)-1,3a,4,5,6,6a-hexahydro-pentalen-2-yl]-pentanoic acid methyl ester

methyl (1R,5S,6S,7R)-6-tert-butyldimethylsilyloxymethyl-7-tetrahydropyranyloxybicyclo<3.3.0>oct-2-ene-3-γ-pentenoate