C5H6N3O2+·H2PO4−	F(000) = 488
Mr = 237.11	Dx = 1.794 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 4062 reflections
a = 8.6076 (5) Å	θ = 3.2–27.5°
b = 4.6703 (3) Å	µ = 0.33 mm−1
c = 21.9431 (13) Å	T = 150 K
β = 95.573 (2)°	Needle, colourless
V = 877.94 (9) Å3	0.45 × 0.06 × 0.04 mm
Z = 4