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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N3—H31⋯N1	0.86 (1)	2.00 (2)	2.679 (2)	134 (2)
N3—H32⋯N2i	0.86 (1)	2.40 (2)	3.228 (2)	161 (2)
N4—H41⋯N6	0.86 (1)	2.25 (1)	3.084 (3)	165 (3)
N4—H42⋯N8i	0.86 (1)	2.50 (2)	3.350 (3)	176 (2)
N7—H71⋯N5	0.86 (1)	2.03 (2)	2.717 (3)	136 (2)
N8—H81⋯N2	0.86 (1)	2.24 (1)	3.096 (3)	177 (2)

Symmetry code: (i) .