  The six-quark instanton induced 't Hooft interaction is considered in
combination with the Nambu-Jona-Lasinio (NJL) type U_L(3)X U_R(3) chiral
symmetric Lagrangian. We discuss the bosonization of this multi-quark
interaction, taking the U_A(1) breaking as a perturbation. We discuss its
relation with the usual approach.
