Using CN1Cc2c(Br)cc(Cl)cc2C(c2ccccc2N)C1, O=C(Cl)CCCCl to produce CN1Cc2c(Br)cc(Cl)cc2C(c2ccccc2N2CCCC2=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.