Crystal structure of 4-(3-carb­oxy­pro­pan­amido)-2-hy­droxy­benzoic acid mono­hydrate

In the title hydrate, C₁₁H₁₁NO₆·H₂O, the organic mol­ecule is approximately planar (r.m.s. deviation for the non-H atoms = 0.129 Å) and an intra­molecular O—H...O hydrogen bond closes an S(6) ring. In the crystal, the benzoic acid group participates in an O—H...O hydrogen bond to the water mol­ecule and accepts a similar bond from another water mol­ecule. The other –CO₂H group forms a carb­oxy­lic acid inversion dimer, thereby forming an R₂²(8) loop. These bonds, along with N—H...O and C—H...O inter­actions, generate a three-dimensional network.