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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2n⋯N3	0.88	2.19	3.019 (5)	156
N4—H4n⋯N1	0.88	2.17	3.010 (5)	160
N6—H6n⋯N7	0.88	2.13	2.968 (5)	158
N8—H8n⋯N5	0.88	2.25	3.096 (5)	161