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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1	0.82	1.97	2.669 (3)	143
N2—H2⋯O3	0.90 (1)	1.97 (3)	2.629 (3)	129 (3)
O4—H4B⋯O2	0.88 (3)	2.01 (3)	2.880 (4)	171 (3)
O4—H4A⋯O2i	0.88 (3)	2.04 (2)	2.893 (4)	165 (4)

Symmetry code: (i) .