Z-L-Ala 4-nitrobenzyl ester

N-(苄氧羰基)-L-丙氨酸对硝基苯酯

Z-L-Ala N,N-dimethylcarbamoylmethyl ester

Z-L-Ala 4-cyanobenzyl ester

Cbz-L-Ala-OEt