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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O3	0.82 (2)	2.16 (2)	2.941 (3)	160 (2)
N3—H3⋯O3	0.86 (3)	2.19 (3)	3.017 (3)	159 (2)
O3—H31⋯O2i	0.87 (5)	1.90 (5)	2.756 (3)	167 (4)
O3—H32⋯O1ii	0.90 (4)	1.86 (5)	2.754 (3)	171 (3)

Symmetry codes: (i) ; (ii) .