1,2-Benzenedicarboxylic acid, 4,4'-carbonylbis- 114367-57-6 2479-49-4 4,4'-Carbonyldiphthalic acid 50976-11-9 56585-48-9 68123-44-4 68123-48-8 68226-90-4 68226-91-5 72252-62-1 Benzophenone-3,3',4,4'-tetracarboxylic acid EINECS 219-613-1