C5H8N2O	F(000) = 240
Mr = 112.13	Dx = 1.199 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 25 reflections
a = 4.1690 (8) Å	θ = 9–13°
b = 9.3940 (19) Å	µ = 0.09 mm−1
c = 15.880 (3) Å	T = 298 K
β = 92.67 (3)°	Block, brown
V = 621.2 (2) Å3	0.30 × 0.20 × 0.10 mm
Z = 4