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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯N5	0.90 (2)	1.90 (2)	2.799 (2)	176 (2)
N2—H2N⋯N4i	0.90 (2)	1.88 (2)	2.781 (2)	179 (2)
N3—H3N⋯S1	0.86 (2)	2.47 (2)	3.317 (2)	168 (2)

Symmetry code: (i) .