1,2-Pyrrolidinedicarboxylic acid, 4-cyano-, 1-(1,1-dimethylethyl) 2-methyl ester, (2S,4S)-
1-(1,1-Dimethylethyl) 2-methyl (2S,4S)-4-cyano-1,2-pyrrolidinedicarboxylate
1-tert-Butyl 2-methyl (2S,4S)-4-cyanopyrrolidine-1,2-dicarboxylate
N-(tert-Butoxycarbonyl)-(4S)-4-cyano-L-proline methyl ester