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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2N⋯N1i	0.88	2.11	2.975 (2)	166
N3—H3NA⋯O1ii	0.87	2.22	3.045 (2)	157
N3—H3NB⋯O1iii	0.85	2.55	3.155 (2)	130

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