title: Hydroxonium 1-ammonio-ethyl-idene-1,1-bis-phospho-nate.
abstract: The title compound, H(3)O(+)·C(2)H(8)NO(6)P(2) (-), contains a disordered H(3)O(+) cation and an NH(3)C(CH(3))(PO(3)H)(2) anion. The three H atoms of the H(3)O(+) cation are statistically distributed over four positions with occupancies of 0.75, resulting in a pseudo tetra-hedron. Multiple N-H⋯O and O-H⋯O hydrogen bonds generate an intricate three-dimensional network.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Du-Lin
authors.initials: DL
authors.lastname: Yin