Using Cc1cccc(N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)n1, CC1(C)C(=O)N(Br)C(=O)N1Br to produce CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1cccc(CBr)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.