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Molecules of the title compound, C
5H
6O
4, form extended tapes
via O—H

O interactions. The tapes assemble
via C—H

O interactions giving rise to planar sheets.
Supporting information
 | Crystallographic Information File (CIF) Contains datablocks i, global |
 | Structure factor file (CIF format) Contains datablock e041 |
CCDC reference: 129540

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