Using CC(=O)OCCBr, O=C(c1cccnc1Oc1cc(Cl)ccc1Cl)N1CCNc2ccccc21 to produce CC(=O)OCCN1CCN(C(=O)c2cccnc2Oc2cc(Cl)ccc2Cl)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.