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The title compound, C 8 H 8 N 4 Se 2 , crystallizes in a non-symmetrical conformation with a dihedral angle between the heterocycles of 45.0 (3)° and a nearly strain-free tetramethylene tether. The crystal studied was non-merohedrally twinned with a fractional contribution of 0.342 (3) for the minor twin component.

5,12-Diselena-3,4,13,14-tetraazatricyclo[9.3.0.02,6]tetradeca-3,13-diene

5,12-Diselena-3,4,13,14-tetraazatricyclo[9.3.0.0^2,6]tetradeca-3,13-diene