Using C[N+](=O)[O-], O=Cc1c[nH]c2ccc(-c3ccc4[nH]cnc4c3)cc12 to produce O=[N+]([O-])C=Cc1c[nH]c2ccc(-c3ccc4[nH]cnc4c3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.