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The title compound, C 20 H 14 N 2 O 3 S, 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.

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