| C15H26N4+·2Br−·H2O | F(000) = 896 |
| Mr = 440.23 | Dx = 1.466 Mg m−3 |
| Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
| a = 7.211 (5) Å | Cell parameters from 9889 reflections |
| b = 18.311 (17) Å | θ = 2.6–30.2° |
| c = 15.409 (5) Å | µ = 4.07 mm−1 |
| β = 101.35 (3)° | T = 293 K |
| V = 1995 (2) Å3 | Prism, clear colourless |
| Z = 4 | 0.3 × 0.15 × 0.1 mm |