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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3O⋯O2i	0.86 (4)	1.76 (4)	2.616 (2)	176 (4)
C9—H9B⋯O3ii	0.98	2.56	3.534 (3)	171

Symmetry codes: (i) ; (ii) .