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In the title compound, C13H9NO8·CH3OH, the main mol­ecule possesses three carb­oxy­lic acid groups, which are asymmetrically distributed around the mol­ecule core. This results in hydrogen-bonding motifs ranging from a chain to various rings. The combination of the chain motif together with a carb­oxy­lic dimer R22(8) ring motif creates a ribbon of mol­ecules propagating along the c-axis direction. A second ribbon results from the combination of the chain motif together with a methanol solvent mol­ecule and carboxyl-containing R44(12) ring motif. These two ribbons combine alternately, forming a hydrogen-bonded layer of mol­ecules parallel to (2\overline{1}0).

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The crystal strucure of the title compound, C7H9NO, displays N—H...O hydrogen bonds which link mol­ecules related by translation along the b axis, and O—H...N and further N—H...O hydrogen bonds which link mol­ecules related by the 21 screw axis along the c axis. The resulting combination is a hydrogen-bonded layer of mol­ecules parallel to (011).
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