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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1⋯N3i	0.88 (3)	2.25 (3)	3.119 (3)	167 (2)
N2—H2⋯N1ii	0.88 (3)	2.43 (3)	3.260 (3)	158 (3)
C3—H3⋯N4iii	0.93	2.55	3.471 (4)	170

Symmetry codes: (i) ; (ii) ; (iii) .