STRUCTURE OF 2,4,6-TRINITRO-8,10-DIPROPIONYL-2,4,6,8,10-PENTAAZABICYCLO[5.3.0]DECANE

C11H18N8O8, M(r) = 390.3, orthorhombic, Pbca, a = 6.552 (2), b 25.794 (6), c = 19.412 (5) angstrom, V = 3281 (2) angstrom3, Z = 8, D(x) = 1.581 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 1.12 mm-1, F(000) = 1632, T = 295 K, final R = 0.054, wR = 0.055 for 1481 independent observed reflections. The five-membered ring is essentially planar while the seven-membered ring has adopted a chair conformation. All three nitro groups are pyramidal with N-N to C-N-C angles of 19.8, 28.6 and 29.5-degrees.