1,2-Benzenediol, 4-chloro- 2138-22-9 4-06-00-05614 (Beilstein Handbook Reference) 4-CHLORO-1,2-DIHYDROXYBENZENE 4-Chlorocatechol 4-Chloropyrocatechol BRN 1907691 EINECS 218-381-9 Pyrocatechol, 4-chloro-