4-Imino-2,7-dimethyl-5,6,7,8-tetra­hydro-4H-1-benzothieno[2,3-d]pyrimidin-3-amine

In the title compound, C(12)H(16)N(4)S, the fused benzothio­phene and the pyrimidine rings are coplanar [dihedral angle = 1.61 (6)°]. Three C atoms of the cyclohexene ring (at positions 3, 6 and 7) are disordered over two sites with an occupancy ratio of 0.702 (8):0.298 (8). The cyclo­hexene ring in both the major and minor components adopts a half-chair conformation. The crystal structure is stabilized by N—H⋯N and C—H⋯N inter­actions, resulting in the formation of inversion dimers with R (2) (2)(10) and R (2) (2)(12) graph-set motifs.