2-[[2-(quinoline-2-carbonylamino)acetyl]amino]acetic acid

2-[[2-(tritylamino)acetyl]amino]acetic acid

1-[(苄氧基)羰基]-L-脯氨酰甘氨酰甘氨酸

(2-苯磺酰基氨基乙酰基氨基)-乙酸

Z-PHE-GLY-GLY-OH