Using COC(=O)C(C)(C)Cc1c(Cc2ccc(Cl)cc2)c2ccc(OC(=O)c3ccc(Cl)cc3)cc2n1C to produce COC(=O)C(C)(C)Cc1c(Cc2ccc(Cl)cc2)c2ccc(O)cc2n1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.