C16H16N2O4·H2O	F(000) = 672
Mr = 318.32	Dx = 1.274 Mg m−3
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 2203 reflections
a = 7.942 (1) Å	θ = 2.3–24.6°
b = 21.273 (2) Å	µ = 0.10 mm−1
c = 10.246 (1) Å	T = 298 K
β = 106.596 (2)°	Block, colourless
V = 1659.0 (3) Å3	0.32 × 0.30 × 0.30 mm
Z = 4