title: Pseudosymmetry in ammonium [(carboxymethyl)sulfanyl]acetate.
abstract: The structure of the title compound, NH(4)(+).C(4)H(5)O(4)S(-), is composed of monocarboxylate anions of [(carboxymethyl)sulfanyl]acetic acid linked into infinite chains via strong O-H...O(-) hydrogen bonds. The three-dimensional structure is completed by the ammonium cations, which interlink neighbouring chains via N-H...O hydrogen bonds. Solution and refinement in the true space group Pn led to an unambiguous position for the single carboxyl H atom. In the higher symmetry space group P2/n, the carboxylate anion would be located on a twofold axis.
authors: National Institute of Public Health, Chełmska 30/34, 00-725 Warsaw, Poland. maurin@urania.il.waw.pl
authors: Jan K
authors: JK
authors: Maurin
authors: Michał
authors: M
authors: Pawłowski
authors: Zbigniew
authors: Z
authors: Czarnocki