Using O=[N+]([O-])c1c(NCCOCCCc2cccnc2)c2ccccc2n2nnnc12 to produce Nc1c(NCCOCCCc2cccnc2)c2ccccc2n2nnnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.