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The title compound, C 18 H 22 N 2 O 3 , represents a (4 S ,5 R ,6 S )-stereoisomer, crystallizing as a racemate in a centrosymmetric space group. The six-membered aliphatic ring adopts a half-chair conformation, with the hy­droxy- and acetyl-substituted C atoms deviating by 0.458 (2) and −0.366 (2) Å, respectively, from the plane defined by other four ring atoms. The pyrazole ring is essentially planar [r.m.s deviation = 0.004 (2) Å]. In the crystal, the mol­ecules are linked into chains along the  b  axis by N—H⋯N hydrogen bonds. The chains are linked by O—H⋯N hydrogen bonds into layers parallel to the  bc  plane.

rac-1-[6-Hydroxy-4-(4-methoxyphenyl)-3,6-dimethyl-4,5,6,7-tetrahydro-2H-indazol-5-yl]ethanone