Using CC(C)(C)OC(=O)NC(COc1ccc(Br)cc1)C(=O)O, COC(=O)[C@H](N)C(C)C to produce COC(=O)C(NC(=O)C(COc1ccc(Br)cc1)NC(=O)OC(C)(C)C)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.