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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O4—H4⋯O2	0.88 (2)	1.77 (3)	2.535 (3)	144 (4)
O1—H1⋯O3	0.84 (2)	1.78 (3)	2.524 (3)	146 (4)