Using O=C1CCC(=O)N1Br, COc1ccc2cc(-c3cccc(Nc4ncccc4[N+](=O)[O-])c3)ccc2c1 to produce COc1ccc2cc(-c3cccc(Nc4ncccc4[N+](=O)[O-])c3)ccc2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.