1,4,6,8,10-Pentaaza-5,7,9-triphospha(5-P(V))spiro[4.5]deca-5,7,9-triene, 7,7,9,9-tetrakis(1-aziridinyl)-7,7,9,9-tetrahydro- 1,4,6,8,10-Pentaaza-5,7,9-triphosphaspiro[4.5]deca-5,7,9-triene, 7,7,9,9-tetrakis(1-aziridinyl)- NSC376732