Using CC(C)(C)c1nnc(-c2nn(-c3ccc(Cl)cc3Cl)c(-c3ccc(Cl)cc3)c2C=O)o1, BrC(Br)(Br)Br to produce CC(C)(C)c1nnc(-c2nn(-c3ccc(Cl)cc3Cl)c(-c3ccc(Cl)cc3)c2C=C(Br)Br)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.