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In the title compound, [Cu(C8H8NO3)2], the nearly planar mol­ecule (r.m.s. deviation = 0.037 Å) is centrosymmetric with the CuII atom lying on an inversion center. The CuII atom is tetra­coordinated, displaying a slightly distorted square-planar geometry. The main deviation from the ideal geometry is seen in the differences in the Cu—O [1.8833 (10) Å] and Cu—N [1.9405 (13) Å] bond lengths, while angular deviations are less than 3°. Intra­molecular O—H...O and inter­molecular Csp2—H...O hydrogen bonds form S(5) and R22(8) ring motifs, respectively. The latter inter­action results in chains of mol­ecules along [100].
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