Using BrBr, CCCC[C@]12Cc3cc(O)ccc3C1=CC(=O)[C@H]2CCC to produce CCCC[C@]12Cc3cc(O)ccc3C1=C(Br)C(=O)[C@H]2CCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.