Using CCOC(=O)c1c[nH]c2ccc(S(=O)(=O)C3CCCC3)cc2c1=O to produce O=C(O)c1c[nH]c2ccc(S(=O)(=O)C3CCCC3)cc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.