Using COC(=O)/C=C/c1ccc(S(=O)(=O)c2ccccc2)cc1Br to produce COC(=O)CCc1ccc(S(=O)(=O)c2ccccc2)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.