Using CCOC(=O)c1cnc(Cl)c2c(CBr)csc12, O=[N+]([O-])c1cccc(O)c1 to produce CCOC(=O)c1cnc(Cl)c2c(COc3cccc([N+](=O)[O-])c3)csc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.