Using CC(=O)O, CC(C)(C)OC(=O)[C@@H]1CC[C@@H](CC(NCc2ccccc2)C(N)=O)N1C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N1[C@H](CC(NCc2ccccc2)C(=O)O)CC[C@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.