(Z)-4-(3-methylanilino)-4-oxobut-2-enoic acid

马来酸 2-硝基苯胺

(E)-4-oxo-4-(pyridin-3-ylamino)but-2-enoic acid

(E)-4-[(4-methyl-1,3-thiazol-2-yl)amino]-4-oxobut-2-enoic acid

1-((4-甲基苯基)甲基)-1H-吡咯-2,5-二酮