Using CI, COCCOC(=O)C1=C(O)c2ccccc2S(=O)(=O)N1 to produce COCCOC(=O)C1=C(O)c2ccccc2S(=O)(=O)N1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.