Using O=C1c2ccccc2C(=O)c2c1ccc(C(=O)O)c2[N+](=O)[O-], NO to produce Nc1cc(C(=O)O)c(N)c2c1C(=O)c1ccccc1C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.