Using CC(=O)Br, COC(=O)C(=C(C)C)N1C(=O)[C@H](OC(=O)COc2ccccc2)[C@H]1SSc1nc2ccccc2s1 to produce COC(=O)C(=C(C)C)N1C(=O)[C@H](OC(=O)COc2ccccc2)[C@H]1SC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.