Using COC(=O)c1c(C)cccc1[N+](=O)[O-], O=C1CCC(=O)N1Br to produce COC(=O)c1c(CBr)cccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.