Abstract
The structure of the title compound, C 12 H 12 N 6 O 4 , consists of independent tricyclic molecules with a central pyrazine ring and terminal pyrimidine rings. The molecular centroid coincides with a crystallographic inversion centre, leading to a trans disposition of the terminal pyrimidine rings. The angle between the central pyrazine ring and the pyrimidine rings is 4.2 (3)°, indicating that the molecule is almost planar
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