Using CI, COC(=O)C1=C(O)c2cc(Cl)ccc2S(=O)(=O)N1 to produce COC(=O)C1=C(O)c2cc(Cl)ccc2S(=O)(=O)N1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.