L-丙氨酰基-L-脯氨酸

BOC-ALA-ALA-PRO-OH

N-carbpbenzoxy-alanine pentafluorophenyl ester

(2S)-1-[(2S)-2-[[(2S)-2-(phenylmethoxycarbonylamino)propanoyl]amino]propanoyl]pyrrolidine-2-carboxylic acid