Using O=C1CCC(=O)N1Br, CC(C)(C)c1cc(-c2cccc3c2C=CC3)cc(C(C)(C)C)c1 to produce CC(C)(C)c1cc(-c2cccc3c2C=C(Br)C3)cc(C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.