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In the title compound, C8H7N5O2, the benzene ring makes a dihedral angle of 45.7 (2)° with the tetrazole ring. In the crystal structure, the molecules are linked into a chain running along the a axis by N—H...N hydrogen bonds, and the chains are linked through π–π interactions between the tetrazole rings [centroid–centroid distance = 3.450 (2) Å].