2-(1,3-dioxo-2-azaspiro[4.5]decan-2-yl)acetic acid

3-(carboxymethylamino)benzoic acid

[(2-溴苯甲酰基)氨基]乙酸

(噻吩-2-磺酰基氨基)-乙酸

BOC-PHE-PHE-GLY-OH