A 1:1 Molecular Complex of 1,5-Diphenylbiuret and Phenyl Carbamidonitrile

Crystals of the title compound, 1,5-diphenylbiuret-N-cyano-N'-phenylurea (1/1), C₁₄H₁₃N₃O₂.C₈H₇N₃O, were obtained from both ethanol and ethyl acetate solutions of phenyl carbamidonitrile. The structure of the complex features pairs of diphenylbiuret and phenyl carbamidonitrile molecules linked by hydrogen-bonds. Excluding a tilted phenyl group, the molecule of 1,5-diphenylbiuret has a large, approximately coplanar, fragment in which all C-N bonds are partial double bonds.