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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O3i	0.89 (4)	2.16 (5)	3.009 (4)	158 (5)
O4—H4⋯N1	0.82	2.64	3.239 (5)	131
O4—H4⋯O2	0.82	1.96	2.729 (4)	157
O3—H3⋯O4ii	0.82	1.78	2.602 (5)	175

Symmetry codes: (i) ; (ii) .