Crystal structure and Hirshfeld surface analysis of 3,6-bis-(pyrimidin-2-yl)-1,4-di-hydro-1,2,4,5-tetra-zine dihydrate.

In the title compound, CHN·2HO or Hbmtz·2HO [bmtz = 3,6-bis-(2'-pyrimid-yl)-1,2,4,5-tetra-zine], the asymmetric unit consists of one-half mol-ecule of Hbmtz and one water mol-ecule, the whole Hbmtz mol-ecule being generated by a crystallographic twofold rotation axis passing through the middle point of the 1,4-di-hydro-1,2,4,5-tetra-zine moiety. In the crystal, N-H⋯O, N-H⋯N, O-H⋯O hydrogen bonds and aromatic π-π stacking inter-actions link the components into a three-dimensional supra-molecular network. Hirshfeld surface analysis was used to further investigate the inter-molecular inter-actions in the crystal structure.