4,4-Dinitro-5,6,7,8,9,10-hexa­hydro-4H-cyclo­nona­[d]isoxazole

The title compound, C₁₀H₁₃N₃O₅, was designed as a potential endothelin receptor antagonist and as a probe of the structural requirements of the endothelin receptor binding site. The isoxazole ring is planar and the cyclo­nona­ne moiety lies approximately in the plane of the heterocycle. The mol­ecules are packed in the crystal structure by ionic and van der Waals inter­actions.