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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O2i	0.82	1.99	2.777 (4)	161
O2—H2⋯O1ii	0.82	2.03	2.808 (3)	158

Symmetry codes: (i) ; (ii) .