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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯O2i	0.86	2.22	2.976 (5)	147
N4—H4B⋯N3ii	0.86	2.25	3.074 (5)	160

Symmetry codes: (i) ; (ii) .