2-Amino-3-carboxypyrazin-1-ium dihydrogen phosphate

International audienceIn the crystal structure of the title compound, C5H6N3O2+*H2PO4-, the dihydrogen phosphate anions are linked through short O-H...O hydrogen bonds, forming infinite double chains running parallel to the b axis. Centrosymetric N-H...O hydrogen-bonded cationic dimers form bridges between these chains by means of intermolecular N-H...O and O-H...O hydrogen bonds, leading to a two-dimensional network parallel to (100) in which R33(12), R43(10) R22(8) and C(4) graph-set motifs are generated. Weak intermolecular C-H...O hydrogen bonds connect these layers, forming a three-dimensional network