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In the title compound, C6H4N4S, the planar mol­ecule lies across a crystallographic mirror plane. In the crystal, the mol­ecules form centrosymmetric dimers through cyclic amino N—H...N hydrogen-bonding associations with cyano N-atom acceptors [graph set R22(12)] and these dimers are extended through amine–cyano N—H...N associations into a three-dimensional network.
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