Using CCS(=O)(=O)c1ccc(C(=O)OC)c(Cl)c1OCC(C)=O to produce CCS(=O)(=O)c1ccc(C(=O)O)c(Cl)c1OCC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.