Using O=C1OC(=O)c2cc(Br)ccc21, COC(=O)[C@H](Cc1ccc(N)cc1)NC(=O)OC(C)(C)C to produce COC(=O)[C@H](Cc1ccc(N2C(=O)c3ccc(Br)cc3C2=O)cc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.