Using C=Cc1c(OCc2ccccc2)ccn(C2CCN(C(=O)OC(C)(C)C)CC2)c1=O to produce CCc1c(O)ccn(C2CCN(C(=O)OC(C)(C)C)CC2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.