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

In the title hydrate, C11H11NO6 center dot H2O, the organic molecule is approximately planar (r.m.s. deviation for the non-H atoms = 0.129 angstrom) and an intramolecular O-H center dot center dot center dot O hydrogen bond closes an S(6) ring. In the crystal, the benzoic acid group participates in an O-H center dot center dot center dot 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 R-2(2)(8) loop. These bonds, along with N-H center dot center dot center dot O and C-H center dot center dot center dot O interactions, generate a three-dimensional network.