Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯Br3i	0.86	2.47	3.324 (7)	172
N8—H8⋯Br1	0.86	2.52	3.367 (8)	170
N9—H9B⋯Br4ii	0.86	2.64	3.487 (10)	168
N2—H2B⋯Br2iii	0.86	2.73	3.547 (9)	158

Symmetry codes: (i) ; (ii) ; (iii) .