Synonyms: Phthalicanhydride, 4,4'-oxydi- (7CI,8CI);3,3',4,4'-Diphenyl ether tetracarboxylic aciddianhydride;3,3',4,4'-Diphenyl oxidetetracarboxylic dianhydride;3,3',4,4'-Tetracarboxydiphenyl ether dianhydride;4,4'-Oxydiphthalicacid dianhydride;4,4'-Oxydiphthalic dianhydride;ODPA-M;