The molecular structure of the title compound, C30H18N3O6P3, is distor
ted from that observed in related clathrate compounds. The central pho
sphazene core takes a boat conformation. The peripheral naphthalene ri
ngs are not planar and the five-membered exocyclic rings are bent appr
eciably at the O-atom positions. The packing of the distorted molecule
s is governed predominantly by van der Waals forces in the crystal.