Catalysis of the reaction: (2E,4E)-6-(2-aminophenyl)-2-hydroxy-6-oxohexa-2,4-dienoate + H2O = (2E)-2-hydroxypenta-2,4-dienoate + anthranilate + H+.
2-hydroxy-6-oxo-6-(2'-aminophenyl)hexa-2,4-dienoate hydrolase activity