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C 27 H 20 N 2 O 3 , MW = 420, orthorhombic, Pbc2 1 , a = 4.686(2), b = 16.784(8), c = 25.924(10)Å, V = 2039Å 3 , d   obs  = 1.37 g cm -3 (flotation), d  calc  = 1.369g cm -3 , Z = 4. The structure has been determined by direct methods and refined to R = 0.045 based on 1419 independent reflections. No crystallographic symmetry element is present in the dixanthylurea molecule. In fact, the molecule is considerably distorted from any possible mirror symmetry. The molecules are hydrogen bonded in an infinite chain along the a -axis. The compound is of interest because of its role in the analytical determination of urea.

Dixanthylurea (N, N'-di-9H-xanthen-9-ylurea)