Using CC(C)(C)OC(=O)N[C@H](Cc1ccc(Cl)cc1)C(=O)O, Brc1cnc2[nH]ncc2c1N1CCNCC1 to produce CC(C)(C)OC(=O)N[C@H](Cc1ccc(Cl)cc1)C(=O)N1CCN(c2c(Br)cnc3[nH]ncc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.