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The 2-sulfanyl­idene-3,4-di­hydro­quinoxalin-2-yl ring system of the title solvate, C15H12N4OS·C3H7NO, is essentially planar, the maximum deviation from the mean plane being 0.024 (2) Å for the thione C atom. The mean plane through the fused-ring system is almost perpendicular to the terminal phenyl ring, as indicated by the dihedral angle of 70.05 (8)°. In the crystal, the main and solvent mol­ecules are linked by N—H...O hydrogen bonds, forming a layer parallel to (010).
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