Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H31⋯O1ii	0.83 (5)	1.96 (5)	2.786 (3)	176 (5)
O3—H32⋯O2iii	0.94 (4)	1.75 (4)	2.672 (3)	167 (4)

Symmetry codes: (ii) ; (iii) .