ethyl 7-{(2R)-2-[(1E,3S)-3-hydroxy-4-(4-methylphenyl)-1-buten-1-yl]-5-oxo-1-pyrrolidinyl}heptanoate

ethyl 7-{(2R)-2-[(1E,3S)-3-hydroxy-4-(3-ethylphenyl)-1-buten-1-yl]-5-oxo-1-pyrrolidinyl}heptanoate

ethyl 7-{(2R)-2-[(1E,3S)-3-hydroxy-4-(3-n-propylphenyl)-1-buten-1-yl]-5-oxo-1-pyrrolidinyl}heptanoate

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

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