2,3,3',4'-Biphenyltetracarboxylic dianhydride

[4,5']biisobenzofuranyl-1,3,1',3'-tetraone ; 4,5'-bi(1,3-isobenzofurandione) ; 3,4'-biphthalic anhydride ; [4,5'-biisobenzofuran]-1,1',3,3'-tetraone ; 2,3,3',4'-biphenyl tetracarboxylic dianhydride ; 2,3,3',4'-biphenyltetracarboxylic ; 3,3',4',4'-biphenyl ; 4,5'-bi-2-benzofuran-1,1',3,3'-tetrone ; 4,5'-bi[isobenzofuran]-1,1',3,3'-tetrone ; 4,5'-bi[isobenzofuran-1,3-dione]