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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H1N4⋯N3i	0.883 (16)	2.130 (15)	2.9429 (9)	152.9 (15)
C5—H5⋯N5ii	1.012 (12)	2.437 (11)	3.3700 (10)	152.9 (10)

Symmetry codes: (i) ; (ii) .