Using COc1c(Br)cc2c(c1S(C)(=O)=O)CCN(C(C)=O)CC2 to produce COc1ccc2c(c1S(C)(=O)=O)CCN(C(C)=O)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.