7-{(2R)-2-[(1E,3S)-3-hydroxy-4-(4-methylphenyl)but-1-enyl]-5-oxopyrrolidin-1-yl}heptanoic acid

7-{(2R)-2-[(1E,3S)-3-hydroxy-4-(3-ethylphenyl)but-1-enyl]-5-oxopyrrolidin-1-yl}heptanoic acid

7-((2R)-2-{(1E,3S)-3-hydroxy-4-[3-(2,2,2-trifluoroethoxymethyl)phenyl]-1-buten-1-yl}-5-oxo-1-pyrrolidinyl)heptanoic acid

7-{(R)-2-[(E)-3-(3-benzyl-phenyl)-3-hydroxy-propenyl]-5-oxo-pyrrolidin-1-yl}-heptanoic acid ethyl ester

7-[(S)-2-(3-Hydroxy-octyl)-5-oxo-pyrrolidin-1-yl]-heptanoic acid ethyl ester