2-(1-phenylethyl)butanedioic acid

2-methylsulfanylbutanedioic acid

(2-甲基-2-丙烯-1-基)琥珀酸酐

4-(2,6-二甲基苯胺)-4-氧代-2-丁酸

2-(2,5-二氧代-2,5-二氢-1H-吡咯-1-基)苯甲酸