Using CCCC(=O)N[PH](=O)C1(NC(=O)OCc2ccccc2)CCCN(N)C1=O to produce CCCC(=O)N[PH](=O)C1(N)CCCN(N)C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.