The crystal structure of 3,7-di(3-nitrophenyl)-1,5-dioxa-3,7-diazacyclooctane (DDCO) was determined by crystallographic methods. The monoclinic crystal, C16H16N4O6, belongs to space group P21/n with cell dimensions of a = 6.6994(18), b = 12.369(3), c = 19.003(5)Å, β = 92.791(6)°, V = 1572.8(7)Å-3. Z = 4. Final R1 = 0.0551. The compound DDCO has a chair-chair of crown conformation.
