61739-58-0 NSC269185 Phosphonium, [(2,3,5,6-tetrachloro-1,4-phenylene)bis(methylene)]bis[[2-(diphenylphosphino)ethyl]diphenyl-, dichloride [(2,3,5,6-TETRACHLORO-1,4-PHENYLENE)BIS(METHYLENE)]BIS[2-(DIPHENYLPHOSPHINO)ETHYL]DIPHENYLPHOSPHONIUM, DICHLORIDE