Using CCOC(=O)c1ccc2c(C=O)c(C(C)C)[nH]c2c1, BrCc1ccccc1 to produce CCOC(=O)c1ccc2c(C=O)c(C(C)C)n(Cc3ccccc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.