ethyl 2-[(2-{(2R)-2-[(1E,3S)-3-hydroxy-1-octen-1-yl]-5-oxo-1-pyrrolidinyl}ethyl)thio]-1,3-thiazole-4-carboxylate

ethyl 2-[(2-{(2R)-2-[(1E)-4-(3-methylphenyl)-3-oxo-1-buten-1-yl]-5-oxo-1-pyrrolidinyl}ethyl)thio]-1,3-thiazole-4-carboxylate

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

ethyl (R,E)-2-((2-(2-oxo-5-(3-oxooct-1-en-1-yl)pyrrolidin-1-yl)ethyl)thio)thiazole-4-carboxylate

ethyl (R,E)-2-((2-(2-oxo-5-(3-oxo-4-phenylbut-1-en-1-yl)pyrrolidin-1-yl)ethyl)thio)thiazole-4-carboxylate