4-Phenyl-2-(2-pyridylmethyl­sulfan­yl)-3H-1,5-benzodiazepine

The title compound, C21H17N3S, is a new heterocyclic system derived from 1,5-benzodiazepine. The mol­ecule is built up from two fused six- and seven-membered rings with phenyl and picolylsulfanyl side groups. The seven-membered ring displays a twist-chair conformation. The cohesion of the crystal structure is ensured by weak slipped π–π stacking between the pyridine rings of symmetry-related mol­ecules [interplanar distance = 3.42 A and centroid-to-centroid vector = 3.784 (1) A] and weak C—H⋯N hydrogen-bond inter­actions.