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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯N2i	0.882 (15)	2.469 (15)	3.2048 (14)	141.3 (13)
C4—H4B⋯N2	0.93	2.55	3.187 (2)	126

Symmetry code: (i) .