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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O2i	0.70 (3)	2.33 (4)	2.996 (4)	161 (5)
N2—H2N⋯O4ii	0.88 (4)	2.18 (4)	3.052 (4)	172 (4)
N2—H3N⋯N4iii	0.97 (4)	2.28 (4)	3.191 (5)	155 (4)
N3—H4N⋯O3i	0.79 (3)	2.17 (3)	2.957 (3)	170 (3)
N4—H5N⋯N2iv	0.85 (4)	2.45 (4)	3.241 (5)	155 (4)
N4—H6N⋯O1v	0.86 (4)	2.47 (4)	3.323 (5)	171 (4)

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