Using CN1CCN(C2=Nc3ccccc3N3CCc4cc(Br)cc2c43)CC1 to produce CN1CCN(C2=Nc3ccccc3-n3ccc4cc(Br)cc2c43)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.