Using BrCc1ccccc1, C=C(C)C1(CC(C)C)CCN(CC(=O)OCC)C1=O to produce C=C(C)C1(CC(C)C)CCN(C(Cc2ccccc2)C(=O)OCC)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.