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The title compound, C11H13N5, is a Schiff base synthesized by the reaction of 4-amino-4H-1,2,4-triazole and 4-(dimethylamino)benzaldehyde. The dihedral angle between the benzene and triazole rings is 43.09 (11)°. The crystal structure displays weak C—H...N interactions.

The title compound, C6H8N4O3·2H2O, which crystallized as a dihydrate, has two almost planar segments viz. the pyrimidine ring and the C—N—C(=O)—C group [maxmum deviations of 0.020 (2) and 0.014 (2) Å, respectively], with a dihedral angle of 87.45°. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds.

The title compound, C13H19N3O2, was obtained by the direct solvent-free reaction of 4-hydroxy-3-methoxybenzaldehyde with 1-amino-4-methylpiperazine. The piperazine ring adopts a chair conformation. In the crystal, strong intermolecular O—H...N and weak intermolecular C—H...O and C—H...N hydrogen bonds help to establish the packing.