Supplier: 1 1, 4, 5, 8-Naphthalenetetracarboxylic Dianhydride ,2 3,3',4,4'-Benzophenonetetracarboxylic dianhydride Nomenclature:BTDA, 3 4,4'-Oxydiphthalic Anhydride Nomenclature ODPA, 4 4,4'-biphthalic Anhydride Nomenclature:BPDA, 5 1,2,3,4-cyclo butane tetracarboxylic dianhydride, Benzy ltriphenylphosphonium chloride
