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In the title compound, C 19 H 19 NOS, the six-membered hetero­cyclic ring of the benzo­thia­zine fragment exhibits a screw boat conformation. The plane of the fused benzene ring makes a dihedral angle of 72.38 (12)° with that of the terminal phenyl ring, and is nearly perpendicular to the mean plane formed by the atoms through the  n -butyl chain, as indicated by the dihedral angle of 88.1 (2)°. In the crystal, mol­ecules are linked by C—H⋯O inter­actions to form supra­molecular chains along [110].

(2Z)-2-Benzylidene-4-n-butyl-3,4-dihydro-2H-1,4-benzothiazin-3-one