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)degrees. 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 center dot center dot center dot S hydrogen bonds link the molecules into centrosymmetric dimers with R-2(2)(16) ring motifs. Weak C-H center dot center dot center dot pi interactions may further stabilize the structure.