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The title compound, C 12 H 15 N 5 OS, was obtained by reaction of 2-(2-(methyl­thio)pyrimidin-4-yl)-3-oxopropane­nitrile with (tetra­hydro­furan-3-yl)hydrazine dihydro­chloride, and the racemic product was subsequently separated by chiral chromatography (first peak; [α] D20  = +51.3°). The chiral center at the substituted atom of the tetra­hydro­furanyl group has an  R -configuration. The pyrimidine and pyrazolyl rings are almost coplanar, their mean planes forming a dihedral angle of 6.4 (1)°. One of the H atoms of the amino group participates in an intra­molecular hydrogen bond with the pyrimidine N atom in position 3. The second H atom is involved in an inter­molecular hydrogen bond, which links the mol­ecules into an infinite chain.

(R)-4-[2-(Methylsulfanyl)pyrimidin-4-yl]-1-(tetrahydrofuran-3-yl)-1H-pyrazol-5-amine