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In the title compound, C 18 H 19 N 3 O 2 S, the thia­zine ring adopts an envelope conformation, with the S atom displaced by 0.732 (1) Å from the other atoms of the ring. The phenyl ring is oriented at a dihedral angle of 79.33 (7)° with respect to the fused benzene ring. The conformations about the two double bonds in the  R   2 C=N—N=C(CH 3 )Ar grouping are  Z  and  E , respectively. In the crystal, inversion dimers linked by pairs of C—H⋯O inter­actions generate  R   2   2 (8) and  R   2   2 (12) loops, as parts of infinite chains along the  a -axis direction.

1-Ethyl-4-[1-(1-phenylethylidene)hydrazin-2-ylidene]-3,4-dihydro-1H-2λ6,1-benzothiazine-2,2-dione

1-Ethyl-4-[1-(1-phenylethylidene)hydrazin-2-ylidene]-3,4-dihydro-1H-2λ⁶,1-benzothiazine-2,2-dione