Using CSc1nc2ccc(C=O)cc2s1, Nc1cc(Br)ccc1[N+](=O)[O-] to produce CSc1nc2ccc(CNc3cc(Br)ccc3[N+](=O)[O-])cc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.