Crystal structure of 1,5-diethyl-3′,5′-di­phenyl-1,5-di­hydro-3′H-spiro­[pyra­zolo[3,4-d]pyrimidine-4,2′-[1,3,4]thia­diazole]

In the title compound, C(22)H(22)N(6)S, the pyrazolo­[3,4-d]pyrimidine rings system is almost planar, with the r.m.s. deviation for the fitted atoms being 0.011 Å. The two phenyl groups linked to the thia­diazole ring are nearly perpendicular to the fused-ring system as indicated by the dihedral angles of 86.93 (10) and 83.35 (11)°. However, the phenyl rings are almost coplanar with the thia­diazole ring (r.m.s. deviation = 0.015 Å), forming dihedral angles of 10.44 (11) and 10.06 (12)°. In the crystal, mol­ecules are connected into a supra­molecular layer in the ac plane via C—H⋯π inter­actions.