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In the title compound, C 16 H 15 N 3 O 2 ·H 2 O, the mean plane of the approximately planar pyrazole ring [maximum deviation = 0.0474 (18) Å] makes dihedral angles of 86.32 (11) and 45.04 (10)° with the phenyl and pyridine rings, respectively. The dihedral angle between the phenyl and pyridine rings is 69.62 (11)°. In the crystal, inter­molecular O—H⋯O and O—H⋯N hydrogen bonds connect the components into chains along [010]. The crystal structure is further stabilized by π–π stacking inter­actions with centroid–centroid distances of 3.7730 (12) Å.

(5-Hydroxy-3-methyl-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl)(pyridin-4-yl)methanone monohydrate