N-formyl-L-2-amino-4-cyanobutyric acid ethyl ester

ethyl (S)-2-amino-4-cyanobutanoate hydrochloride

(4R)-2-[(3S)-3-ethoxycarbonyl-3-(formylamino)propyl]-4-(ethoxycarbonylmethylcarbamoyl)-2-thiazoline

N-(S-benzyl-L-cysteinyl)-glycine methyl ester

H-CYS(BZL)-GLY-OH