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In the molecule of the title compound, C17H16N2OS, the almost planar methylsulfanylquinazoline group [the methyl C atom deviates by 0.032 (2) Å from the plane through the ring system] forms an interplanar angle of 76.26 (4)° with the plane of the phenyl group. An intramolecular O—HN hydrogen bond is present between the quinazoline and hydroxy groups. In the crystal, molecules are stacked along the b-axis direction.