Crystal structure of 4,6-di­amino-2-sulfanyl­idene-1,2-di­hydro­pyridine-3-carbo­nitrile

The title compound, C₆H₆N₄S, crystallizes with two independent mol­ecules, A and B, in the asymmetric unit. Both independent mol­ecules are almost planar [maximum deviations of 0.068 (6) Å in mol­ecule A and 0.079 (6) Å in mol­ecule B]. In the crystal, mol­ecules A and B are linked by N—H...S, N—H...N and C—H...S hydrogen bonds, forming a three-dimensional network.