Using OB(O)c1ccc(Cl)cc1, CN1CCc2c(Br)ccc([N+](=O)[O-])c2C1 to produce CN1CCc2c(-c3ccc(Cl)cc3)ccc([N+](=O)[O-])c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.