Ethyl 4-(4-hydroxy­phenyl)-6-methyl-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate

In the title compound, C₁₄H₁₆N₂O₄, the ethyl chain of the ethoxy­carbonyl group displays rotational disorder. In the crystal structure, the mol­ecules are connected in a three-dimensional network through intermolecular N—H...O and O—H...O hydrogen-bond interactions.

3-(1,5-Di­methylpyrazol-4-yl)-4-phenyl-1H-1,2,4-triazole-5(4H)-thione

The title compound, C₁₃H₁₃N₅S, possesses crystallographically imposed mirror symmetry. In the crystal structure, the mol­ecules interact through strong intermolecular N—H...N hydrogen bonds to form ribbons running parallel to the a axis.

Ethyl 3-cyano-7-methyl­pyrazolo­[1,5-a]­pyrimidine-6-carboxyl­ate

In the title mol­ecule, C₁₁H₁₀N₄O₂, all bond lengths and angles are in normal ranges. In the crystal structure, weak intermolecular C—H...N hydrogen bonds link the mol­ecules into centrosymmetric dimers. The crystal packing is further stabilized by van der Waals forces.