3,3-Ethylenedithio-3,3a,4,5,10,10b-hexahydro-2H-furo[2,3-a]carbazole

The title compound, C16H17NOS2, consists of a carbazole skeleton with tetrahydrofuran and dithiolane rings. In the indole ring system, the benzene and pyrrole rings are nearly coplanar, forming a dihedral angle of 1.57 (15)°. The cyclohexenone and tetrahydrofuran rings have envelope conformations, while the dithiolane ring adopts a twist conformation. In the crystal structure, pairs of weak intermolecular N—H...S hydrogen bonds link the molecules into centrosymmetric dimers with R22(16) ring motifs. Weak C—H...π interactions may further stabilize the structure.