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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2O⋯N2i	0.97 (2)	1.71 (2)	2.679 (2)	179 (2)
O3—H3O⋯N1ii	0.87 (2)	1.86 (2)	2.728 (2)	171 (2)

Symmetry codes: (i) ; (ii) .