C8H13N2O+·C7H3N2O7−·H2O	Z = 2
Mr = 398.33	F(000) = 416
Triclinic, P1	Dx = 1.497 Mg m−3
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 6.6691 (3) Å	Cell parameters from 6994 reflections
b = 11.3831 (4) Å	θ = 2.4–31.6°
c = 12.2900 (5) Å	µ = 0.13 mm−1
α = 89.727 (2)°	T = 100 K
β = 76.771 (2)°	Block, yellow
γ = 76.930 (2)°	0.52 × 0.13 × 0.10 mm
V = 883.62 (6) Å3