Using CC(=O)c1c(-c2ccc(Cl)cc2)[nH]c2ccccc12, BrCCc1ccccc1 to produce CC(=O)c1c(-c2ccc(Cl)cc2)n(CCc2ccccc2)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.