J. Karolakwojciechowska et K. Kieckononowicz, PHENYL-1H,2H,5H-IMIDAZO-[1,2-A]IMIDAZOLE-3,6-DIONE, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 300-302
The conformation of the title molecule, C17H13N3O2, is generally simil
ar to the conformations of analogous compounds. Both five-membered rin
gs possess envelope conformations. The dihedral angle between the mean
planes of these two rings equals 5.33 (8)-degrees. The molecules in t
he crystal are joined by an intermolecular hydrogen bond N1-H4...O1(x,
1/2 + y, z) of 2.869 (3) angstrom.