2,5-二苯胺基环己-1,4-二烯-1,4-二羧酸二甲酯

2,5-二甲氧酰基-1,4-环己二酮

2,5-Dihydroxybenzol-1,4-dicarbonsaeure-dimethylester

2,5-Bis-(3,3-dimethyl-1-phenyl-ureido)-terephthalsaeure-dimethylester