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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1O⋯O4	0.84	1.89	2.727 (2)	175
O2—H2O⋯O1i	0.84	2.00	2.823 (2)	168
O3—H3O⋯O2ii	0.84	1.89	2.728 (2)	174
O4—H4O⋯O3iii	0.84	2.02	2.825 (2)	161

Symmetry codes: (i) ; (ii) ; (iii) .