title: Crystal structure of (S)-2-amino-2-methyl-succinic acid.
abstract: The title compound, C5H9NO4, crystallized as a zwitterion. There is an intra-molecular N-H⋯O hydrogen bond involving the trans-succinic acid and the ammonium group, forming an S(6) ring motif. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming C(7) chains along the c-axis direction. The chains are linked by N-H⋯O and C-H⋯O hydrogen bonds, forming sheets parallel to the bc plane. Further N-H⋯O hydrogen bonds link the sheets to form a three-dimensional framework.
authors.affiliation: School of Science, Tokai University, 4-1-1 Kitakaname, Hiratuka, Kanagawa 259-1292, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Fujii
keywords: crystal structure; hydrogen bonding; succinic acid; three-dimensional framework; zwitterion