4-(5-氨基-1-氧杂-2-氮杂-3-铵环戊-2,4-二烯-3-基)丁酸氯化物

4-[(4-nitrobenzoyl)amino]butanoic acid

4-[(2-hydroxybenzoyl)amino]butanoic acid

4-(4-氧代-2-硫代氧基-3-噻唑基)丁酸

γ-丁内酯