1,3,5,7,2,4,6,8-Tetrazatetraphosphocine, 2,2,4,4,6,6,8,8-octahydro-2,2,4,4,6,6,8,8-octaisothiocyanato- 6710-61-8 NSC42149 Phosphonitrile isothiocyanate, cyclic tetramer