英文别名1,2-Pyrrolidinedicarboxylic acid, 1-(1,1-diMethylethyl) 2-ethyl ester, (2S)-; Saxagliptin Impurity 44; 1-(tert-Butyl) 2-ethyl (S)-pyrrolidine-1,2-dicarboxylate; (2S)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester; (S)-1-tert-butyl 2-ethylpyrrolidine-1,2-dicarboxylate; (S)-N-tert-Butoxycarbonylproline ethyl ester; (S)-N-Boc-proline ethyl ester 
