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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H1O⋯O1S	1.06 (3)	1.40 (3)	2.459 (2)	173 (2)
O1S—H1S⋯O1i	0.87 (3)	1.82 (3)	2.687 (2)	178 (3)
O1S—H2S⋯O1ii	0.91 (4)	1.78 (4)	2.682 (2)	167 (3)

Symmetry codes: (i) ; (ii) .