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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1N2⋯O1	0.92 (3)	2.13 (3)	2.783 (4)	127 (2)
N2—H2N2⋯N1i	0.86 (3)	2.25 (3)	3.088 (4)	166 (3)
N3—H1N3⋯N4	0.86 (2)	2.12 (3)	2.787 (3)	135 (2)

Symmetry code: (i) .