| C4H9N2O3+·Cl−·H2O | F(000) = 196 |
| Mr = 186.60 | Dx = 1.508 Mg m−3 |
| Monoclinic, P21 | Mo Kα radiation, λ = 0.71073 Å |
| a = 5.0922 (1) Å | Cell parameters from 3444 reflections |
| b = 10.1450 (2) Å | θ = 3.3–29.7° |
| c = 8.1950 (2) Å | µ = 0.44 mm−1 |
| β = 103.834 (2)° | T = 123 K |
| V = 411.08 (2) Å3 | Prism, colourless |
| Z = 2 | 0.45 × 0.30 × 0.25 mm |