Using BrBr, CC(C)CSc1nc(N)c2ncn(Cc3ccccc3)c2n1 to produce CC(C)CSc1nc(N)c2nc(Br)n(Cc3ccccc3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.