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