fumaranilic acid methyl ester

methyl 4-anilino-4-oxobut-2-enoate

3,4-二氢-3-氧-2H-1,4-苯噻嗪-2-乙酸

5-(苯基亚胺)呋喃-2(5H)-酮

N-苯基马来酰亚胺