Using COCCn1cc(C2CCN(Cc3cccc(C(=O)OC)c3)CC2)c2cccnc21 to produce COCCn1cc(C2CCN(Cc3cccc(C(=O)O)c3)CC2)c2cccnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.