Using CI, O=C(Nc1ccccc1)N1CCN(Cc2ccc(Br)c(Br)c2)CC1 to produce CN(C(=O)N1CCN(Cc2ccc(Br)c(Br)c2)CC1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.