Using CN(C(=O)CC(CCBr)c1ccc(Cl)c(Cl)c1)c1ccc(Cl)cc1, O=C1CCNCC1 to produce CN(C(=O)CC(CCN1CCC(=O)CC1)c1ccc(Cl)c(Cl)c1)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.