In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Syntheses of 1,4,5,8-tetraazanaphthalene derivatives from diaminomaleonitrile, published in 1978-09-30, which mentions a compound: 56413-95-7, Name is 5,6-Dichloropyrazine-2,3-dicarbonitrile, Molecular C6Cl2N4, Computed Properties of C6Cl2N4.
Cyclization of diaminomaleonitrile (I) with (COCl)2 in dioxane gave 70% II. Chlorination of II by POCl3 gave 50% III. Amination off III by NH3 in DMF gave 90% IV. Cyclization of IV with (COCl)2 and chlorination by POCl3 gave 50% V. Cyclization of I with III gave 90% 2,3,6,7-tetracyano-1,4-dihydro-1,4,5,8-tetraazanaphthalene (VI). Oxidation of VI by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone gave VII.
From this literature《Syntheses of 1,4,5,8-tetraazanaphthalene derivatives from diaminomaleonitrile》,we know some information about this compound(56413-95-7)Computed Properties of C6Cl2N4, but this is not all information, there are many literatures related to this compound(56413-95-7).
Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate