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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3O⋯O6i	0.80 (3)	2.00 (3)	2.7761 (18)	164 (3)
O4—H4O⋯O5	0.83 (3)	1.95 (3)	2.6806 (18)	146 (2)
O5—H5O⋯O2ii	0.86	1.90	2.7455 (18)	167
O6—H6O⋯O3	0.83 (2)	1.88 (2)	2.6642 (18)	157 (2)

Symmetry codes: (i) ; (ii) .