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Figure 1
Labelling of atoms in oxalic acid dihydrate. The molecule of oxalic acid is located at a special position (inversion centre located at the midpoint of the C1—C1 bond) and is accompanied by two molecules of H2O. The asymmetric part of the unit cell consists of those atoms which are labelled.

IUCrJ
Volume 7| Part 5| September 2020| Pages 920-933
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520010441