1,2-Benzenediol, 4,5-dichloro- 3428-24-8 4,5-DICHLOROCATECHOL 4,5-Dichloropyrocatechol 4-06-00-05617 (Beilstein Handbook Reference) BRN 2086136 EINECS 222-331-1 Pyrocatechol, 4,5-dichloro-