Using O=C1NC(=Cc2ccccc2)C(O)=C1[N+](=O)[O-], C=[N+]=[N-] to produce NC1=C([N+](=O)[O-])C(=O)NC1=Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.