Using CNC(=O)[C@H](CC(C)C)NC(=O)C(CC(C)C)CP(=O)(CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H]1CCCN1C(=O)OCc1ccccc1)OC to produce CNC(=O)[C@H](CC(C)C)NC(=O)C(CC(C)C)CP(=O)(O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H]1CCCN1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.