Using O=[N+]([O-])c1ccc(O)c(CNc2cc([N+](=O)[O-])ccc2O)c1 to produce Nc1ccc(O)c(CNc2cc(N)ccc2O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.