3-tert-Butyl-1-(3-nitro­phen­yl)-1H-pyrazol-5-amine

In the title compound, C₁₃H₁₆N₄O₂, the pyrazole ring forms a dihedral angle of 50.61 (6)° with the 3-nitro-phenyl ring. The plane of the nitro group is twisted by 6.8 (7)° out of the plane of the phenyl ring. In the crystal, the mol­ecules are linked by N—H...N and N—H...O hydrogen bonds, forming sheets in the bc plane. In addition, a weak C—H...N inter­action is observed.

3-[(R)-1-Hy­droxy­butan-2-yl]-1,2,3-benzo­triazin-4(3H)-one

The crystal structure of the title compound, C₁₁H₁₃N₃O₂, is stabilized by O—H...O hydrogen bonds, which link the mol­ecules into chains along [100].