C9H11N3O4·H2O	F000 = 512
Mr = 243.22	Dx = 1.486 Mg m−3
Monoclinic, P21/c	Mo Kα radiation λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 2841 reflections
a = 7.1731 (4) Å	θ = 3.1–25.8º
b = 12.6590 (10) Å	µ = 0.12 mm−1
c = 12.3698 (3) Å	T = 173 (2) K
β = 104.603 (6)º	Prism, yellow
V = 1086.95 (11) Å3	0.35 × 0.05 × 0.02 mm
Z = 4