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The chiral title compound, C 4 H 10 NO + ·C 4 H 5 O 6− ·H 2 O, is a hydrated mol­ecular salt in which the tartaric acid has transferred one proton to the ( S )-2-amino­propan-1-ol mol­ecule. The crystal structure is stabilized by a three-dimensional network of N—H⋯O and O—H⋯O hydrogen bonds. The absolute configuration was assigned on the basis of the starting materials.

(S)-1-Hydroxypropan-2-aminium (2R,3R)-3-carboxy-2,3-dihydroxypropanoate monohydrate