Using BrBr, CNC(=O)c1ccc(C)c(Nc2cc(N(C)CC(C)(C)C)nc(NC)n2)c1 to produce CNC(=O)c1ccc(C)c(Nc2nc(NC)nc(N(C)CC(C)(C)C)c2Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.