(S)-5-Oxo-1,2-pyrrolidinedicarboxylic acid, 1-(1,1-dimethylethyl) ester 1,2-Pyrrolidinedicarboxylic acid, 5-oxo-, 1-(1,1-dimethylethyl) ester, (2S)- 1-(tert-Butyl) hydrogen (S)-5-oxopyrrolidine-1,2-dicarboxylate 53100-44-0 EINECS 258-362-2