134580-17-9 4',4''(5'')-Bis(diphenylbenzylphosphonium)dibenzo-18-crown-6 diiodide Dibenzo(b,k)(1,4,7,10,13,16)hexaoxacyclooctadecin, phosphonium deriv. Phosphonium, (6,7,9,10,17,18,20,21-octahydrodibenzo(b,k)(1,4,7,10,13,16)hexaoxacyclooctadecin-2,14-diyl)bis(diphenyl(phenylmethyl)-, diiodide