Using Clc1ccc(CBr)cc1, O=C1NCCc2ccc(N3CCNCC3)cc21 to produce O=C1NCCc2ccc(N3CCN(Cc4ccc(Cl)cc4)CC3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.