Using O=C(O)CSc1ccc2c(c1)C(=O)c1sccc1CO2, O=C([O-])O to produce COC(=O)CSc1ccc2c(c1)C(=O)c1sccc1CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.