Using CCOC[C@H](NC(=O)[C@H](NC(=O)[C@@H](NC(=O)OCc1ccccc1)C(Cc1ccccc1)C(=O)O)C(C)C)c1ccccc1 to produce CCOC[C@H](NC(=O)[C@H](NC(=O)[C@@H](N)CC(=O)O)C(C)C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.