Using O=Cc1cccc2cncn12, O=C([O-])CCCC[PH](c1ccccc1)(c1ccccc1)c1ccccc1 to produce O=C(O)CCCC=Cc1cccc2cncn12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.