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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H4⋯O1i	0.81 (3)	1.93 (3)	2.705 (2)	160 (3)
O4—H5⋯O3ii	0.94 (3)	1.70 (3)	2.632 (1)	176 (3)

Symmetry codes: (i) ; (ii) .