Using COc1ccc(C(=O)Oc2ccc(C(=O)CNC(C)(C)C)cc2O)cc1 to produce COc1ccc(C(=O)Oc2ccc(C(O)CNC(C)(C)C)cc2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.