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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
OW1—HW1A⋯N7	0.85 (2)	1.96 (2)	2.805 (3)	176 (3)
OW1—HW1B⋯N8i	0.85 (2)	2.03 (3)	2.876 (3)	178 (3)
N4—H4B⋯O4ii	0.86	1.95	2.804 (3)	172
N4—H4B⋯N2ii	0.86	2.69	3.518 (4)	162

Symmetry codes: (i) ; (ii) .