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Acta Cryst. (2013). E69, o1856-o1857
[ doi:10.1107/S1600536813032170 ]

2-Methyl­aspartic acid monohydrate

G. Brewer, A. S. Burton, J. P. Dworkin and R. J. Butcher

Abstract: The title compound, C5H9NO4·H2O, is an isomer of the [alpha]-amino acid glutamic acid that crystallizes from water in its zwitterionic form as a monohydrate. It is not one of the 20 proteinogenic [alpha]-amino acids that are used in living systems and differs from the natural amino acids in that it has an [alpha]-methyl group rather than an [alpha]-H atom. In the crystal, an O-H...O hydrogen bond is present between the acid and water mol­ecules while extensive N-H...O and O-H...O hydrogen bonds link the components into a three-dimensional array.

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