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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H1⋯O2i	0.73 (3)	2.12 (3)	2.823 (2)	164 (3)
O4—H2⋯O1ii	0.79 (3)	2.04 (3)	2.789 (2)	158 (3)

Symmetry codes: (i) ; (ii) .