Using CC(C)C[C@@H](CO)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@H](Cc1cccc2ccccc12)NC(=O)OCc1ccccc1 to produce CC(C)C[C@@H](CO)NC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@@H](N)Cc1cccc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.