Using O=S(Cl)Cl, CC(=O)OCCc1cc(S(=O)(=O)[O-])c2ccccc2c1Br to produce CC(=O)OCCc1cc(S(=O)(=O)Cl)c2ccccc2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.