Using BrCc1ccccc1, O=C1Nc2cc(Cl)ccc2C1c1ccc(Cl)cc1 to produce O=C1Nc2cc(Cl)ccc2C1(Cc1ccccc1)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.