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The title compound, C 12 H 12 N 4 , was synthesized by the reaction of hydrazine hydrate  and 9-methyl-3,4,6,7-tetra­hydro-2 H -xanthene-1,8(5 H ,9 H )-dione in ethanol. In the crystal, the mol­ecule lies across an inversion centre. The pyridazine rings are coplanar and the C 6  rings adopt envelope conformations.

1,2,3,6,7,8-Hexahydrocinnolino[5,4,3-cde]cinnoline