Using OC1CCN(c2nccnc2OC2CN(c3ccc4ccccc4n3)C2)CC1 to produce O=C1CCN(c2nccnc2OC2CN(c3ccc4ccccc4n3)C2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.