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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2′⋯N1	0.86 (2)	2.20 (2)	2.6698 (19)	114.2 (16)
N2—H2′⋯N3	0.86 (2)	2.48 (2)	2.777 (2)	101.2 (15)
N2—H2′⋯O2i	0.86 (2)	2.60 (2)	3.2112 (19)	129.0 (17)
N3—H3′⋯O2i	0.86 (2)	2.05 (2)	2.8508 (19)	155.5 (18)
N3—H3′⋯N4	0.86 (2)	2.28 (2)	2.6670 (19)	107.8 (15)

Symmetry code: (i) .