Using BrCc1ccccc1, O=C(NCc1ccccc1)c1ccnc(N2CCCCC2=O)c1 to produce O=C(NCc1ccccc1)c1ccnc(N2CCCC(Cc3ccccc3)C2=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.