4-(3-bromoanilino)-4-oxobutanoic acid

4-(4-iodoanilino)-4-oxobutanoic acid

methyl 4-(dodecylamino)-4-oxobutanoate

4-(4-羟基-苯基氨基)-4-氧代-丁酸

5,6,6,6-tetrafluoro-4-oxo-5-(trifluoromethyl)hexanoic acid