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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H1⋯N1	0.90 (2)	2.37 (2)	2.932 (2)	121 (1)
N4—H2⋯N3i	0.87 (2)	2.23 (2)	3.070 (2)	162 (2)

Symmetry code: (i) .