ID 1.13.11.36 DE chloridazon-catechol dioxygenase. CA 5-amino-4-chloro-2-(2,3-dihydroxyphenyl)pyridazin-3(2H)-one + O2 = CA 5-amino-4-chloro-2-(2-hydroxymuconoyl)pyridazin-3(2H)-one + 2 H(+). CC -!- Involved in the breakdown of the herbicide chloridazon. CC -!- Not identical with EC 1.13.11.1, EC 1.13.11.2 or EC 1.13.11.5. //