for the following products
(S)-tert-Butyl 4-oxo-2-(thiazolidine-3-carbonyl)pyrrolidine-1-carboxylate | 1-Pyrrolidinecarboxylic acid, 4-oxo-2-(3-thiazolidinylcarbonyl)-,1,1-dimethylethyl ester, (2S)- and (2S)-4-oxo-2-(3-thiazolidinylcarbonyl)-1-pyrrolidinecarboxylic acid tert-butyl ester
