1,3-Isobenzofurandione, 5,5'-carbonylbis- 101505-15-1 160903-84-4 163915-23-9 174612-63-6 2421-28-5 3,3',4,4'-Benzophenonetetracarboxylic acid dianhydride 3,3',4,4'-Benzophenonetetracarboxylic dianhydride 3,3',4,4'-Tetracarboxybenzophenone dianhydride 4,4'-Carbonylbis(phthalic anhydride) 4,4'-Carbonyldiphthalic anhydride 4,4'-Diphthalic anhydride ketone 55206-66-1 64308-15-2 65929-27-3 68593-66-8 86442-22-0 Benzophenone-3,3':4,4'-tetracarboxylic dianhydride Benzophenonetetracarboxylic acid anhydride Benzophenonetetracarboxylic acid dianhydride Benzophenonetetracarboxylic anhydride Benzophenonetetracarboxylic dianhydride EINECS 219-348-1 NSC 78480 Phthalic anhydride, 4,4'-carbonyldi- Phthalic anhydride, 4,4'-carbonyldi- (8CI)