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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯O4i	0.82	1.90	2.700 (3)	164
O4—H4⋯O1ii	0.82	1.90	2.718 (3)	172

Symmetry codes: (i) ; (ii) .