Using COc1cc(Br)c2c(c1)[C@@H]1CN(C)C[C@H](CN3C(=O)c4ccccc4C3=O)[C@H]1CO2 to produce COc1cc(Br)c2c(c1)[C@@H]1CN(C)C[C@@H](CN)[C@H]1CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.