In the crystal structure of the title compound, 3,4,5-trihydroxybenzoic acid monohydrate, C7H6O5·H2O, the gallic acid molecule has an intramolecular hydrogen bond involving a pair of hydroxyl groups, and it is also linked to a water molecule by a three-centre (bifurcated) OW—H⋯O hydrogen bond. The packing of the molecules is stabilized by intermolecular O—H⋯O and C—H⋯O hydrogen bonds.
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Jiang et al. (2000) studied this question.
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