5-Oxo-DL-proline 1,1-dimethylethyl ester, tert-butyl (S)-5-oxo-pyrrolidine-2-carboxylate, tert-Butyl 5-oxo-2-pyrrolidinecarboxylate, (2S)-5-oxo-proline tert-butyl ester, tert-butyl (2S)-5-oxo-pyrrolidine-2-carboxylate, tert-Butyl (S)-5-oxo-2-pyrrolidinecarboxylate, (2S)-tert-butyl 5-oxopyrrolidine-2-carboxylate, (S)-tert-butyl-5-oxopyrrolidine-2-carboxylate, (S)-2-Pyrrolidone-5-carboxylicacidtert-butylester, Einecs 285-735-7, tert-butyl 5-oxo-DL-prolinate