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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯N3i	0.85 (2)	2.04 (2)	2.839 (2)	157 (2)
N2—H2N⋯O3Aii	0.85 (2)	2.17 (2)	2.873 (8)	140.2 (18)
N2—H2N⋯O4ii	0.85 (2)	2.27 (2)	3.098 (5)	166.1 (19)

Symmetry codes: (i) ; (ii) .