2-(3-Nitro­phen­yl)-3-phenyl-2,3-di­hydro-4H-1,3-benzo­thia­zin-4-one

The title compound, C₂₀H₁₄N₂O₃S, has three aromatic rings, viz. (i) a phenyl ring, (ii) a 3-nitro­phenyl and (iii) a 1,3-benzo­thia­zine fused-ring system. The dihedral angle between (i) and (ii) is 85.31 (15)°, between (ii) and (iii) is 81.33 (15)° and between (i) and (iii) is 75.73 (15)°. The six-membered 1,3-thia­zine ring has an envelope conformation with the C atom in the 2-position forming the flap. In the crystal, mol­ecules are linked by weak C—H...O inter­actions, forming a three-dimensional network.