Using Cn1ncc2c(N)cccc21, O=C(O)c1cccc([N+](=O)[O-])c1Br to produce Cn1ncc2c(Nc3c(C(=O)O)cccc3[N+](=O)[O-])cccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.