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In title compound, C10H12O4, all of the non-H atoms lie approximately in a plane with the largest deviation being 0.061 (2) Å. An intra­molecular O—H...O hydrogen bond generates an S(6) ring motif. No classical inter­molecular hydrogen bonding occurs, with only van der Waals forces stabilizing the crystal structure.

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The title compound, C10H7ClN2, contains two approximately planar mol­ecules, A and B (r.m.s. deviations = 0.039 and 0.064 Å, respectively) in the asymmetric unit. In the crystal, N—H...N hydrogen bonds link the mol­ecules into C(7) chains of alternating A and B mol­ecules propagating along the a-axis direction. The crystal used for the data collection was found to be a racemic twin.
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