Crystal structure of N-[2-(cyclo­hexyl­sulfan­yl)eth­yl]quinolinic acid imide

The title compound, C(15)H(18)N(2)O(2)S {systematic name: 6-[2-(cyclo­hexyl­sulfan­yl)eth­yl]-5H-pyrrolo­[3,4-b]pyridine-5,7(6H)-dione}, was obtained from the reaction of pyridine-2,3-di­carb­oxy­lic anhydride (synonym: quinolinic anhydride) with 2-(cyclo­hexyl­sulfan­yl)ethyl­amine. The dihedral angle between the mean plane of the cyclo­hexyl ring and the quinolinic acid imide ring is 25.43 (11)°. In the crystal, each mol­ecule forms two C—H⋯O hydrogen bonds and one weak C—O⋯π [O⋯ring centroid = 3.255 (2) Å] inter­action with neighbouring mol­ecules to generate a ladder structure along the b-axis direction. The ladders are linked by weak C—O⋯π [O⋯ring centroid = 3.330 (2) Å] inter­actions, resulting in sheets extending parallel to the ab plane. The mol­ecular structure is broadly consistent with theoretical calculations performed by density functional theory (DFT).