Using CCOC(=O)CBr, CC1(C)c2ccccc2C(C#N)c2ccccc21 to produce CCOC(=O)CC1(C#N)c2ccccc2C(C)(C)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.