2,5-二甲氧酰基-1,4-环己二酮

3,3'-Dimethoxycarbonylpropanoic anhydride

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

2.5-Bis-[N-phenyl-benzimidoyloxy]-terephthalsaeure-dimethylester