Using CCC1(C=O)CC2CN(C(=O)N(C)C)CC2C1, O=P([O-])(O)O to produce CCC1(C(=O)O)CC2CN(C(=O)N(C)C)CC2C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.