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The asymmetric unit of the title compound, C15H17NO4·H2O, contains two organic molecules with marginal differences between them and two water molecules. The chromine rings in both molecules are essentially planar, with maximum deviations of 0.012 (2) and 0.060 (2) Å. The five-membered cyclopentane rings adopt envelope conformations in both molecules. In the crystal, the components are linked by N—H...O, O—H...O and C—H...O hydrogen bonds, resulting in a three-dimensional network.