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In the title compound, C7H4Cl2N4, the dihedral angle between the tetra­zole and benzene rings is 17.2 (2)°. In the crystal, C—H...N inter­actions link the mol­ecules into a flattened helical chain along the b axis.

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There are two independent mol­ecules in the asymmetric unit of the title compound, C10H9NO3, in both of which, all non-H atoms except for the methyl C atom lie nearly in the same plane [maximum deviations = 0.094 (3) and 0.043 (2) Å]. In the crystal, each independent mol­ecules is linked by pairs of C—H...O inter­actions, generating inversion dimers with R22(10) ring motifs.
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