| C16H28N42+·2Br−·2H2O | F(000) = 968 |
| Mr = 472.27 | Dx = 1.483 Mg m−3 |
| Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
| a = 17.1577 (6) Å | Cell parameters from 9074 reflections |
| b = 7.3180 (2) Å | θ = 2.4–38.4° |
| c = 18.2712 (6) Å | µ = 3.85 mm−1 |
| β = 112.786 (1)° | T = 100 K |
| V = 2115.09 (12) Å3 | Prism, clear colourless |
| Z = 4 | 0.2 × 0.1 × 0.05 mm |