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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4B⋯N2	0.88	2.33	2.686 (6)	104
N4—H4A⋯N1i	0.88	2.44	3.043 (5)	126

Symmetry code: (i) .