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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3B⋯O1i	0.84 (2)	2.01 (2)	2.8180 (18)	163 (2)
O3—H3C⋯O1ii	0.84 (2)	1.91 (2)	2.7395 (17)	172 (2)
O4—H4C⋯O2iii	0.86 (2)	1.84 (2)	2.6901 (18)	173 (3)
O4—H4B⋯O2	0.81 (2)	2.03 (2)	2.8028 (18)	159 (2)

Symmetry codes: (i) ; (ii) ; (iii) .