In the title compound, C(20)H(22)N(2)O(2)S, the central thieno-pyrimidine ring system is essentially planar, with a maximum displacement of 0.023 (2) Å. The attached cyclo-hexene ring is disordered over two possible conformations, with an occupancy ratio of 0.776 (12):0.224 (12). Neither inter-molecular hydrogen-bonding inter-actions nor π-π stacking inter-actions are present in the crystal structure. The mol-ecular conformation and crystal packing are stabilized by three intra-molecular C-H⋯O hydrogen bonds and two C-H⋯π inter-actions.