2,3-Diphenyl-2,3-di­hydro-4H-pyrido[3,2-e][1,3]thia­zin-4-one

In the racemic title compound, C₁₉H₁₄N₂OS, the two phenyl substituents on the 1,3-thia­zine ring are almost perpendicular to the pyridine ring which is fused to the thia­zine ring [inter-ring dihedral angles = 87.90 (8) and 85.54 (7)°]. The dihedral angle between the two phenyl rings is 75.11 (7)°. The six-membered thia­zine ring has an envelope conformation with the ortho-related C atom forming the flap. The crystals exhibit face-to-edge aromatic-ring interactions with the nearest C—H...C distance equal to 3.676 (3) Å.