Involved in the biodegradation of nitroaromatic and chlorinated nitroaromatic compounds. Catalyzes the conversion of 2-amino-5-chloromuconic acid into 2-hydroxy-5-chloromuconic acid and ammonia. Also able to catalyze the transformation of 2-aminomuconic acid into 2-hydroxymuconic acid. (2Z,4E)-2-aminomuconate + H2O = (3E)-2-oxohex-3-enedioate + NH4(+) Xenobiotic degradation; nitrobenzene degradation. Xenobiotic degradation; 4-chloronitrobenzene degradation. Belongs to the amidase family.