Using COC(=O)CC[C@@H](NC(=O)OCc1ccccc1)C(=O)OC(C)(C)C, C=CCBr to produce C=CC[C@H](C[C@@H](NC(=O)OCc1ccccc1)C(=O)OC(C)(C)C)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.