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

The title compound, C18H22N2O3, represents a (4S,5R,6S)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) angstrom, respectively, from the plane defined by other four ring atoms. The pyrazole ring is essentially planar [r.m.s deviation = 0.004 (2) angstrom]. In the crystal, the molecules are linked into chains along the b axis by N-H center dot center dot center dot N hydrogen bonds. The chains are linked by O-H center dot center dot center dot N hydrogen bonds into layers parallel to the bc plane.