Using CC(C)(C)c1ccc(N2CCN(c3ccc(CO)cc3)C2=O)cc1 to produce CC(C)(C)c1ccc(N2CCN(c3ccc(C=O)cc3)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.