Using COC(=O)c1cc(OC)c(OC(=O)c2ccccc2)cc1-c1c(C(=O)OC)ccc2c1OCO2 to produce COC(=O)c1cc(OC)c(O)cc1-c1c(C(=O)OC)ccc2c1OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.