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In the title compound, C 14 H 11 N 3 OS·C 2 H 5 OH, the dihedral angle between the pyridine N—C fused —C fused —C(thio­phene) plane and the plane of the thio­phene ring is 81.9 (3)°, indicating that they are close to perpendicular. The dihedral angle between this pyridine plane and the benzene ring is 1.3 (3)°. The thio­phene ring is disordered over two coplanar orientations with an occupancy ratio of 0.692 (7):0.308 (7), while the ethanol solvent mol­ecule is also disordered over two sets of site in a 0.66 (4):0.34 (4) ratio. In the crystal, chains are formed along the  b  axis by N—H⋯O and O—H⋯N inter­actions with adjacent chains being connected through C—H⋯N and C—H⋯S inter­actions.

9-(Thiophen-2-yl)-8,9-dihydro-3H-pyrazolo[4,3-f]quinolin-7(6H)-one ethanol monosolvate