L-argininium bis(dihydrogen phosphate)

In the crystal structure of the title compound, C6H 16N4O22+-2H2PO 4-, the argininium residue has a gauche II-trans-trans-trans conformation. The argininium residue forms N-H⋯O and O-H⋯O hydrogen bonds with the phosphate anions; the latter form O-H⋯O hydrogen bonds with each other. Three-centered hydrogen bonding is also observed. © 2003 International Union of Crystallography Printed in Great Britain - all rights reserved.