(S)-tert-Butyl 5-oxopyrrolidine-2-carboxylate, (S)-tert-butyl-5-oxopyrrolidine-2-carboxylate, (2S)-tert-butyl 5-oxopyrrolidine-2-carboxylate, tert-Butyl (S)-5-Oxopyrrolidine-2-carboxylate, tert-Butyl (S)-5-oxo-2-pyrrolidinecarboxylate, tert-butyl (2S)-5-oxo-pyrrolidine-2-carboxylate, (2S)-5-oxo-proline tert-butyl ester, tert-butyl 5-oxo-L-prolinate, L-PYROGLUTAMIC ACID TERT-BUTYL ESTER, L-Pyr-Otbu, 5-Oxo-L-proline 1,1-dimethylethyl ester, tert-butyl5-oxo-L-prolinate, Pyroglutamic acid tert-butyl ester, (S)-5-Oxopyrrolidine-2-carboxylic Acid tert-Butyl Ester, tert-Butyl L-Pyroglutamate, 5-Oxo-L-proline tert-butyl ester, L-PyroglutaMic acid ter-butyl ester, tert-Butyl (S)-2-pyrrolidone-5-carboxylate, L-Proline,5-oxo-,1,1-diMethylethyl ester, tert-butyl (S)-5-oxo-pyrrolidine-2-carboxylate, tert-Butyl S-2-pyrrolidone-5-carboxylate