title: Ammonium 2-amino-pyrazine-3-carboxyl-ate.
abstract: The title compound NH(4) (+)·C(5)H(4)N(3)O(2) (-) crystallizes with two formula units in the asymmetric unit. In each anion, the carboxyl-ate is deprotonated and the planar amino group [angle sums of 359 (3) and 355 (3)° at N] remains protonated. In the crystal, the cations and anions are bridged by N-H⋯O and N-H⋯N hydrogen bonds, forming a three-dimensional network.
authors.affiliation: Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
authors.forename: Martin
authors.initials: M
authors.lastname: Lutz
authors.forename: Arjen J
authors.initials: AJ
authors.lastname: Jakobi