Using O=C(Cl)CBr, Nc1ccc(NCCNc2ccc([N+](=O)[O-])c(N)n2)cc1-c1ccc(Cl)cc1Cl to produce Nc1nc(NCCNc2ccc(NC(=O)CBr)c(-c3ccc(Cl)cc3Cl)c2)ccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.