1,2-Benzenedicarboxylic acid, 3,4,5,6-tetrachloro- 3,4,5,6-Tetrachloro-1,2-benzenedicarboxylic acid 3-09-00-04205 (Beilstein Handbook Reference) 632-58-6 AI3-16302 BRN 1914906 EINECS 211-181-2 NSC 193510 Phthalic acid, perchloro- Phthalic acid, tetrachloro- TETRACHLOROPHTHALIC ACID