Using CCOC(=O)C(OC1CCOCC1)c1ccc(S(=O)(=O)C2CC2)cc1 to produce O=C(O)C(OC1CCOCC1)c1ccc(S(=O)(=O)C2CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.