InChI=1/C23H44NO3P2/c1-8-11-16-28(17-12-9-2,18-13-10-3)22-14-15-24-23(19-22)29(25,26-20(4)5)27-21(6)7/h14-15,19-21H,8-13,16-18H2,1-7H3/q+ phosphonium, [2-[bis(1-methylethoxy)phosphinyl]-4-pyridinyl]tributyl- tributyl[2-(diisopropoxyphosphoryl)pyridin-4-yl]phosphonium