Using Cc1ccc2c(c1)c1ccccc1n2C(=O)OC(C)(C)C, O=C1CCC(=O)N1Br to produce CC(C)(C)OC(=O)n1c2ccccc2c2cc(CBr)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.