| C7H14N3+·Br− | F(000) = 672 |
| Mr = 220.12 | Dx = 1.492 Mg m−3 |
| Monoclinic, P21/m | Mo Kα radiation, λ = 0.71073 Å |
| a = 8.1283 (2) Å | Cell parameters from 9609 reflections |
| b = 21.3822 (7) Å | θ = 3.1–28.2° |
| c = 8.6376 (2) Å | µ = 4.14 mm−1 |
| β = 101.713 (3)° | T = 100 K |
| V = 1469.96 (7) Å3 | Plate, colourless |
| Z = 6 | 0.38 × 0.25 × 0.04 mm |