Using CS(=O)(=O)Oc1cc(C(=O)O)ccc1OCC1CC1, O=C(CO)OCc1ccccc1 to produce CS(=O)(=O)Oc1cc(C(=O)OCC(=O)OCc2ccccc2)ccc1OCC1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.