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The asymmetric unit of the title compound, C9H10N4O, comprises three independent molecules, two pairs of which differ significantly in the rotational orientation of the azido group and one pair having very similar conformations; the N—N—C—C torsion angles are −173.9 (2), −102.7 (2) and −173.6 (2)°. In the crystal, each independent molecule forms N—H...O hydrogen bonds with its glide-plane-related counterparts, forming zigzag chains extending along the c-axis direction.