N-(1-Diacetylamino-1H-tetrazol-5-yl)acetamide

In the crystal structure of the title compound, C7H10N6O3, there are N—H⋯O, N—H⋯N and C—H⋯O interactions, generating a three-dimensional supramolecular network structure. A short intermolecular O⋯C contact of 2.8994 (18) Å is alsopresent in the crystal structure, but no π–π contacts are observed.

In the crystal structure of the title compound, C 7 H 10 N 6 O 3 , there are N-HÁ Á ÁO, N-HÁ Á ÁN and C-HÁ Á ÁO interactions, generating a three-dimensional supramolecular network structure. A short intermolecular OÁ Á ÁC contact of 2.8994 (18) Å is alsopresent in the crystal structure, but no contacts are observed.

Structure Reports Online
The presence of three acetyl groups in the title compound may put itself as an intermediate for preparing derivatives which have a bigger molecule. The title compound had been prepared by Gaponnik & Karavai (1984). Herein we report its crystal structure.
The molecular structure of the title compound is presented in Fig. 1, the bond distances and bond angles in the title compound are as expected for a molecule of this kind. The molecules are linked to each other via N-H···O, N-H···N and C-H···O hydrogen bonds (Table 1). The range for the H···O distances agree with those found for weak C-H···O hydrogen bonds (Desiraju & Steiner, 1999). The O1···C4 ii distance is 2.8994 (18) Å [symmetry code: (ii) x, 3/2-y, -1/2+z], this distance agrees with the disscusion of intermolecular C=O ···C=O interactions (Allen et al., 1998), which may contribute to the stabilization of crystal structure.

Experimental
The title compound was prepared according to the literature method (Gaponnik & Karavai, 1984). 220 mg of obtained product was dissolved in the mixture solution of methanol (10 ml) and acetone (20 ml) and the solution was kept at room temperature to give suitable crystals for X-ray structure determination.

Refinement
Amino H atoms were located in a difference Fourier maps and were refined isotropically. Methyl H-atoms were placed in calculated positions with C-H = 0.98 Å, and torsion angles were refined to fit the electron density with U iso (H) = 1.2U eq (C). Fig. 1. The molecular structure of the title compound with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level.

Special details
Geometry. All esds (except the esd in the dihedral angle betweeex two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds supplementary materials sup-3 in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.