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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O2	0.84 (1)	1.84 (1)	2.659 (2)	166 (2)
O4—H4⋯O3i	0.85 (1)	1.98 (1)	2.818 (2)	166 (2)

Symmetry code: (i) .