Using CC1(C)C=C(c2ccccc2)C(=O)C1, CSc1ccc(Br)cc1 to produce CSc1ccc(C2(O)CC(C)(C)C=C2c2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.