Dimorphism in 3'-aminocyclohexanespiro-5'-hydantoin.

  title={Dimorphism in 3'-aminocyclohexanespiro-5'-hydantoin.},
  author={Boris L Shivachev and Rosica Petrova and Emilia Naydenova},
  journal={Acta crystallographica. Section C, Crystal structure communications},
  volume={61 Pt 8},
The title compound [systematic name: 1'-aminocyclohexanespiro-4'-imidazole-2',5'(3'H,4'H)-dione], C8H13N3O2, has been synthesized and was found to crystallize in two different structures, both monoclinic and both with the same P2(1)/c space group. In the first structure, there are two molecules in the asymmetric unit, one of which uses all of its hydrogen-bond donors and acceptors and forms undulating layers, while the other forms chains propagating perpendicular to the layers. In the second… 

Structure, conformation and hydrogen bonding of two amino-cycloalkanespiro-5-hydantoins

The crystal structures of 3-amino-cycloheptanespiro-4′-imidazolidine-2′,5′-dione (I) {systematic name: 3-amino-1,3-diazaspiro[4.6] undecane-2,4-dione} and


The title compound, 3-amino-5-methyl-5-(4-pyridyl)imidazolidine-2,4-dione, C9H10N4O2, was obtained by reaction of 5-methyl-5-(4-pyridyl)hydantoin with hydrazine. It crystallizes as a racemate in the

Synthesis and Structural Characterization of Spiro(fluorene-9,4′-imidazolidine)-2′,5′-dione and (9H-Fluorene-9-yl)urea

Alkaline hydrolysis of spiro(fluorene-9,4′-imidazolidine)-2′,5′-dione, 2 resulted in ring opening leading to (9H-fluorene-9-yl) urea, 3. The crystal structures 2 and 3 have been determined. Compound

Polymorphism and solvatomorphism 2005.

  • H. Brittain
  • Materials Science
    Journal of pharmaceutical sciences
  • 2007
Papers and patents that deal with polymorphism and solvatomorphism and systems where the crystal structures of the substance are defined by different unit cells, but where these unit cells differ in their elemental composition through the inclusion of one or molecules of solvent are summarized in an annual review.



WinGX suite for small-molecule single-crystal crystallography

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