The title compound, C10H9N3O2, was synthesized from azidobenzene and ethyl acetylacetate. A pair of hydrogen bonds [2.617 (2) Å] interconnects a pair of the carboxyl groups, forming an R 2 2(8) inversion dimer, a frequent motif in carboxylic acids. In the title structure, the bonding H atom in the aforementioned O—H⋯O hydrogen bond is significantly shifted towards the acceptor O atom [the donor and acceptor O—H distances are 1.25 (4) and 1.38 (4) Å, respectively]. A plot of the O⋯O versus O—H distances in compounds with paired carboxyl groups shows that the title structure belongs to the group of structures with abnormally long O—H distances with regard to the O⋯O contacts. The displacement of the bonding H atom towards the centre of the hydrogen bond is concomitant with more equal C—O bonding distances in the carboxyl group.
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