Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1NB⋯O3i	0.88	2.07	2.926 (3)	163
N1—H1NA⋯Br2	0.88	2.56	3.434 (3)	173
N4—H4NA⋯O3ii	0.88	2.09	2.956 (3)	168
O3—H1O⋯Br2	0.81 (5)	2.41 (5)	3.215 (3)	175 (5)
N4—H4NB⋯Br2iii	0.88	2.71	3.548 (3)	160

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