methyl (5Z)-7-{(1R,6S,7R,8R)-8-acetoxy-3,3-dimethyl-2,4-dioxabicyclo[3.3.0]-nonan-7-yl}-5-heptenoate

methyl (5Z)-7-{(1R,2R,3R,5R)-5-acetoxy-3-(2-oxacyclohexyl)oxy-[(1E)-3-oxo-1-octenyl]cyclopentyl}-5-heptenoate

methyl (5Z)-7-{(1R,2R,3R,5S)-5-acetoxy-2-[(1E,3S)-3-hydroxy-1-octenyl]-3-[(2-oxacyclohexyl)oxy]-cyclopentyl}-5-heptenoate

methyl (5Z)-7-[(1R,2S,3R,5R)-5-acetoxy-2-(tert-butyldiphenylsilyloxymethyl)-3-hydroxycyclopentyl]-5-heptenoate