Using O=[N+]([O-])c1cccc(Oc2ccc(-c3ccc(Oc4cccc([N+](=O)[O-])c4)cc3)cc2)c1 to produce Nc1cccc(Oc2ccc(-c3ccc(Oc4cccc(N)c4)cc3)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.