5-(4-aminoanilino)-5-oxopentanoic acid

5-(2,3,4-trimethoxyphenyl)pentanoic acid

5-[3,4-(亚甲基二氧基)苯基]-5-氧代戊酸

5-(2-oxo-1,3,3a,4,5,6,7,7a-octahydrobenzimidazol-5-yl)pentanoic acid

1-benzyl-6-hydroxypiperidin-2-one