Using CC(C)(Br)C(=O)Br, COC(=O)CC12CCCC(c3ccccc3)(CC1)CC2 to produce COC(=O)CC12CCCC(c3ccc(C(=O)C(C)(C)Br)cc3)(CC1)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.