1-Carboxy-2-hydroxypropan-1-aminium 4-methylbenzenesulfonate monohydrate

In the title hydrated salt, C 4 H 10 NO 3 + ·C 7 H 7 O 3 S − ·H 2 O, an intramolecular C—H...O hydrogen bond in the cation generates an S (6) loop. In the crystal, carboxyl-O—H...O(sulfonate), hydroxyl-O—H...O(sulfonate), water-O—H...O(sulfonate, hydroxyl) and ammonium-N—H...O(water, carbonyl) hydrogen bonds link the components of the asymmetric unit into supramolecular layers parallel to (001).