Using C[C@@H](N)C(=O)OC(C)(C)C, CC(C)(C)c1ccc(C(=O)N[C@@H](Cc2ccc(-c3ncc(Br)cn3)cc2)C(=O)O)s1 to produce C[C@@H](NC(=O)[C@H](Cc1ccc(-c2ncc(Br)cn2)cc1)NC(=O)c1ccc(C(C)(C)C)s1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.