Using Cc1c(C(=O)OC(C)C)sc(C(=O)OC(C)C)c1O, CCCCS(=O)(=O)Cl to produce CCCCS(=O)(=O)Oc1c(C(=O)OC(C)C)sc(C(=O)OC(C)C)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.