Using CC(C)C[C@@H](C(=O)NN1C(=O)N[C@@H](C(C)C)C1=O)[C@H](CNC(=O)c1ccccc1)C(=O)NOC1CCCCO1 to produce CC(C)C[C@@H](C(=O)NN1C(=O)N[C@@H](C(C)C)C1=O)[C@H](CNC(=O)c1ccccc1)C(=O)NO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.