Using CS(=O)(=O)Nc1cc2c(cc1Oc1ccccc1)C(=O)C(Br)(Br)CO2 to produce CS(=O)(=O)Nc1cc2occ(Br)c(=O)c2cc1Oc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.