4-[2-chloro-N-(2-cyanoethyl)anilino]-4-oxobut-2-enoic acid

4-[4-(4-fluorophenoxy)phenyl]-4-oxobut-2-enoic acid

1-(4-叔丁基苯基)-吡咯-2,5-二酮

(E)-4-(6-甲基萘-2-基)-4-氧代丁-2-烯酸

2,3-二溴丁二酸