丁二酸酐

(2S)-1-[(2S)-2-[[(2S)-2-aminopropanoyl]amino]propanoyl]-N-[(2S)-3-methyl-1-(4-nitroanilino)-1-oxobutan-2-yl]pyrrolidine-2-carboxamide

N-(苄氧羰基)-L-丙氨酰-L-丙氨酸

N-carbpbenzoxy-alanine pentafluorophenyl ester

N-carbobenzoxy-alanyl-alanyl-prolyl-valine p-nitroanilide