4-(2,5-二氧代吡咯烷-1-基)苯磺酰胺

4-(2-甲氧基-5-甲基苯基)-4-氧代丁酸

4-(4-nitroanilino)-4-oxobutanoic acid

4-(4-hydroxyphenyl)-4-oxobutanoic acid

3-(2-羟基苯甲酰基)丙酸