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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O3	0.88 (3)	2.08 (3)	2.956 (3)	177 (3)
N3—H3N⋯O2	0.86 (3)	2.14 (3)	2.989 (3)	172 (3)
N2—H2N⋯O1i	0.98 (3)	1.92 (3)	2.893 (3)	170 (2)

Symmetry code: (i) .