Isovaline monohydrate

The title compound, C₅H₁₁NO₂·H₂O, is an isomer of the α-amino acid valine that crystallizes from water in its zwitterion form as a monohydrate. It is not one of the 20 proteinogenic amino acids that are used in living systems and differs from the natural amino acids in that it has no α-H atom. The compound exhibits hydrogen bonding between the water mol­ecule and the carboxyl­ate O atoms and an amine H atom. In addition, there are inter­molecular hydrogen-bonding inter­actions between the carboxyl­ate O atoms and amine H atoms. In the crystal, these extensive N—H...O and O—H...O hydrogen bonds lead to the formation of a three-dimensional network.

2-Methyl­aspartic acid monohydrate

The title compound, C₅H₉NO₄·H₂O, is an isomer of the α-amino acid glutamic acid that crystallizes from water in its zwitterionic form as a monohydrate. It is not one of the 20 proteinogenic α-amino acids that are used in living systems and differs from the natural amino acids in that it has an α-methyl group rather than an α-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.