Using O=C1CCC(=O)N1Br, CC(C)(C)OC(=O)Nc1ccc2ccc(C#N)cc2c1 to produce CC(C)(C)OC(=O)Nc1ccc2ccc(C#N)cc2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.