Using OB(O)c1cc(Cl)cc(Cl)c1, CC(C)(C)n1nc(C2CCC2)c2cc(Br)c(=O)[nH]c21 to produce CC(C)(C)n1nc(C2CCC2)c2cc(-c3cc(Cl)cc(Cl)c3)c(=O)[nH]c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.