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The seven-membered ring in the title compound, C28H22N2S, has a two-coordinate N atom as well as a three-coordinate N atom. The ring adopts a boat-shaped conformation with two C atoms of one methylphenyl ring as the stern and the three-coordinate N atom as the prow. The N,N-dimethylethanethioamide fragment is nearly planar (r.m.s. deviation = 0.049 Å); the phenyl ring of the benzenecarbothioyl unit connected to the three-coordinate N atom is aligned at 83.72 (4)° with respect to the mean plane of this fragment. Weak intermolecular C—H...S hydrogen bonding is present in the crystal structure.