N‐Methyl‐dl‐aspartic acid mono­hydrate

The title compound, C₅H₉NO₄·H₂O, has been synthesized and crystallized. It crystallizes in Cc with one mol­ecule in the asymmetric unit. The compound is found in its zwitterionic form. d and l forms of the compound are linked in the crystal via O—H?O and N—H?O hydrogen bonds, both directly between the aspartic acid‐derivative entities and to the crystal water mol­ecule. A weak intramolecular N—H?O interaction is found. The carbon skeleton is slightly twisted with C—C—C—C = 166.83 (11)°. A comparison with other derivatives of aspartic acid shows only two rotamers – one with a near planar carbon skeleton and one with a significantly twisted carbon skeleton.