Using O=S(=O)(Cl)c1cccc(S(=O)(=O)c2ccc(Br)cc2)c1, COC(=O)CCl to produce COC(=O)CS(=O)(=O)c1cccc(S(=O)(=O)c2ccc(Br)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.