马来酸酐

4,4'-二氨基二苯甲烷

(Z)-4-[4-[[4-[[(Z)-3-carboxyprop-2-enoyl]amino]phenyl]methyl]anilino]-4-oxobut-2-enoic acid

1.3苯二磺酰氯

1-(3-hydroxyphenyl)pyrrole-2,5-dione