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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O5—H5O⋯N4	0.87 (3)	1.87 (3)	2.714 (4)	163 (3)
N4—H4N⋯O2	0.86 (4)	2.23 (4)	2.971 (4)	144 (4)
N1—H1N⋯O4i	0.93 (3)	2.32 (3)	3.113 (3)	143

Symmetry code: (i) .