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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O2i	0.84	1.92	2.764 (2)	176
O2—H2⋯N1ii	0.84	1.94	2.777 (2)	178
N4—H7N⋯O1iii	0.92 (3)	2.52 (2)	3.173 (2)	128.5 (7)
N4—H8N⋯N2iv	0.85 (2)	2.19 (2)	3.037 (2)	178 (2)
N5—H9N⋯O1v	0.88 (2)	2.069 (19)	2.909 (2)	160.1 (18)
N5—H10N⋯N3v	0.87 (2)	2.14 (2)	3.008 (3)	179 (2)

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