O7P2Sn
Huang, C.H.Knop, O.Othen, D.A.Woodhams, F.W.D.Howie, R.A.
Canadian Journal of Chemistry (1975) 53, 79-91
a=8.25Å b=8.25Å c=8.25Å
α=90° β=90° γ=90°