Using Cc1ccc2ccc3nc(NC(=O)C(C)(C)C)[nH]c(=O)c3c2c1, O=C1CCC(=O)N1Br to produce CC(C)(C)C(=O)Nc1nc2ccc3ccc(CBr)cc3c2c(=O)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.