1,3-Bis(diphenylphosphino)propane 1,3-Propanediylbis[diphenylphosphine] 6737-42-4 NSC193753 Phosphine, 1,3-propanediylbis[diphenyl- Phosphine, trimethylenebis[diphenyl- Trimethylenebis(diphenylphosphine)