Synonyms: 1,1'-Biphenyl-2,3,3',4'-tetracarboxylicacid dianhydride;2,3,3',4'-Biphenyltetracarboxylic acid dianhydride;2,3,3',4'-Biphenyltetracarboxylic anhydride;2,3,3',4'-Biphenyltetracarboxylicdianhydride;2,3',3,4'-Biphenyltetracarboxylic acid dianhydride;(4,5'-Biisobenzofuran)-1,1',3,3'-tetrone;