Crystal structure of (S)-2-amino-2-methyl-succinic acid

(S)-2-Azaniumyl-2-methyl-3-phenylpropanoate monohydrate

The title compound, C10H13NO2·H2O, crystallizes in a zwitterionic form as a monohydrate, involving the propylbenzene group with atransconformation. It is a non-natural amino acid, and has attracted attention as an inhibitor of phenylalanine hydroxylase. In the crystal, molecules are linked by N—H...O hydrogen bonds, formingC(5) chains along thec-axis direction. Two chains are linked by another N—H...O hydrogen bond, forming anR33(11) ring motif. Further O—H...O hydrogen bonds link these motifsviathe water molecules, to form a three-dimensional framework.