Using O=C([O-])[O-], CC1(C)OC(=O)Nc2ccc(OS(=O)(=O)c3cccc(Cl)c3Cl)cc21 to produce CN1C(=O)OC(C)(C)c2cc(OS(=O)(=O)c3cccc(Cl)c3Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.