3-Ammonio-4-hydroxybenzoate monohydrate

The title compound, C(7)H(7)NO(3)center dot H(2)O, which crystallized as a hydrate, was obtained from an extraction of the plant species Saussurea atkinsonii of the asteraceae family collected from the hilly area (Ayubia) of Pakistan during the flowering season. The dihedral angle between the benzene ring and the carboxylate group is 25.64 (5)degrees. In the crystal, the packing is consolidated by N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds, as well as weak aromatic pi-pi stacking [centroid-centroid separation = 3.9365 (9) angstrom] and C=O center dot center dot center dot pi interactions.