Using OB(O)c1ccc(Cl)cc1, CC1(C)CC(=O)c2c(Br)cn(-c3ccccn3)c2C1 to produce CC1(C)CC(=O)c2c(-c3ccc(Cl)cc3)cn(-c3ccccn3)c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.