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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2o⋯O3	0.85 (1)	1.63 (1)	2.475 (3)	172 (4)
O5—H5o⋯O6	0.86 (1)	1.65 (1)	2.496 (3)	170 (3)
N1—H1n⋯O4	0.88 (1)	2.00 (1)	2.864 (3)	166 (3)
N2—H2n⋯O1i	0.89 (1)	1.99 (1)	2.859 (3)	167 (3)

Symmetry code: (i) .