Synonyms: 1,2-Pyrrolidinedicarboxylicacid, 5-oxo-, bis(1,1-dimethylethyl) ester, (2S)- (9CI);1,2-Pyrrolidinedicarboxylic acid, 5-oxo-, bis(1,1-dimethylethyl) ester, (S)-;N-tert-Butoxycarbonylpyroglutamic acid tert-butyl ester;tert-ButylN-(tert-butoxycarbonyl)pyroglutamate;