Using CCOC(OCC)c1cc(C(=O)NCC2CCN(C(=O)OCc3ccccc3)CC2)ccn1 to produce O=Cc1cc(C(=O)NCC2CCN(C(=O)OCc3ccccc3)CC2)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.