obsolete 2'-aminobiphenyl-2,3-diol 1,2-dioxygenase activity (obsolete GO:0018561)
OBSOLETE. Catalysis of the reaction: 2'-aminobiphenyl-2,3-diol + O2 = H+ + 2-hydroxy-6-oxo-(2'-aminophenyl)-hexa-2,4-dienoate.