methyl (S,Z)-5-(2-(benzyloxy)-2-oxoethylidene)pyrrolidine-2-carboxylate

(2S,5S)-N-(methoxycarbonyl)-5-(hydroxymethyl)-2-(p-methoxyphenyl)-3-pyrroline

methyl (S)-1-benzoyl-2-oxopyrrolidine-5-carboxylate

(-)-(5S)-5-{[(tert-butyldiphenylsilyl)oxy]methyl}-1-tosylpyrrolidin-2-one

(S)-pyroglutamyl-(S)-aspartic acid diethyl ester