Using Nc1c(O)cccc1[N+](=O)[O-], O=C(CBr)c1cccnc1 to produce Nc1c(OCC(=O)c2cccnc2)cccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.