Using ClCBr, OC(c1ccc(Cl)cc1Cl)C(O)(Cn1cncn1)c1ccc(Cl)cc1 to produce Clc1ccc(C2(Cn3cncn3)OCOC2c2ccc(Cl)cc2Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.