2-Chloro-7,8,9,10-tetrahydrocyclohepta[b]indol-6(5H)-one

In the title molecule, C13H12ClNO, the dihedral angle between the benzene and pyrrole rings is 1.38 (9)°. The cycloheptene ring adopts a distorted twist chair and sofa conformation. Intermolecular N—H...O hydrogen bonds form an R22(10) loop in the crystal packing. Further, weak C—H...O and C—H...π (involving the benzene ring) interactions are found in the crystal structure.