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In the title compound, C13H15N3O3, the dihedral angle between the benzene and pyrazole rings is 7.7 (1)° and the O—C—C—N torsion angle of the side chain is 74.1 (2)°. In the crystal, mol­ecules are linked by O—H...O, N—H...O and N—H...N hydrogen bonds.
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