2,3-Diphenyl-2,3-di­hydro-4H-1,3-benzo­thia­zin-4-one

In the title compound, C₂₀H₁₅NOS, the dihedral angle between the phenyl rings is 74.25 (6)°. The six-membered 1,3-thia­zine ring has an envelope conformation with the C atom at the 2-position forming the flap. The crystal structure features weak C—H...O inter­actions, which lead to the formation of a tape motif along [110].