About Pyromellitic acid anhydride
About 1,2,4,5-Benzenetetracarboxylic dianhydride
About PMDA
About Pyromellitic acid dianhydride
About Pyromellitic acid anhydride
About Pyromellitic acid dianhydride
About carboxylic anhydride
About oxygen heterocyclic compound
About aromatic carboxylic acid
About polynuclear aromatic compound