1,3,5,2,4,6-Triazatriphosphorine,2,2,4,4,6,6-hexakis[4-[[[bis[4-[[[2-(diphenylphosphino)phenyl]methylene]amino]phenoxy]phosphinothioyl]methylhydrazono]methyl]phenoxy]-2,2,4,4,6,6-hexahydro-