Abstract
The title compound, C8H12N4O4, was obtained by cyclization of the two l-asparagine molecules and reveals a crystallographic inversion symmetry, and accordingly the two stereogenic centres are of opposite chirality. Thus, an asymmetric unit comprises a half of a molecule. The molecules are assembled into a three-dimensional hydrogen-bonding network by N—H⋯O hydrogen bonds.
Highlights
The title compound, C8H12N4O4, was obtained by cyclization of the two l-asparagine molecules and reveals a crystallographic inversion symmetry, and the two stereogenic centres are of opposite chirality
An asymmetric unit comprises a half of a molecule
Symmetry codes: (ii) −x, y−1/2, −z+1/2; (iii) x, −y+1/2, z−1/2; (iv) x+1, y, z
Summary
Center of Applied Solid State Chemistry Research, Ningbo University, Ningbo, Zhejiang 315211, People’s Republic of China Hydrogen-bond geometry (Å, ). R factor = 0.037; wR factor = 0.098; data-to-parameter ratio = 16.0. The title compound, C8H12N4O4, was obtained by cyclization of the two l-asparagine molecules and reveals a crystallographic inversion symmetry, and accordingly the two stereogenic centres are of opposite chirality. Thus, an asymmetric unit comprises a half of a molecule. The molecules are assembled into a three-dimensional hydrogen-bonding network by N—H O hydrogen bonds. Symmetry codes: (i) x; y 12; z þ 12; (ii) x; y þ 12; z 12; (iii) x þ 1; y; z. Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
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