Using CC(C)(C)OC(=O)N[C@@H](CC(=O)O)Cc1ccc(Br)cc1, BrCc1ccccc1 to produce CC(C)(C)OC(=O)N[C@@H](CC(=O)OCc1ccccc1)Cc1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.