Using COc1ccc(C(=O)N[PH](=O)C2(NC(=O)OCc3ccccc3)CCCN(N)C2=O)cc1 to produce COc1ccc(C(=O)N[PH](=O)C2(N)CCCN(N)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.