1,2-benzenedicarboxylic acid, 3,4,5,6-tetrachloro- 3,4,5,6-tetrachlorophthalic acid 6325-02-6 InChI=1/C8H2Cl4O4/c9-3-1(7(13)14)2(8(15)16)4(10)6(12)5(3)11/h(H,13,14)(H,15,16