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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2⋯O3	0.82	2.18	2.782 (7)	131
N2—H2N⋯O4A	0.82 (6)	1.92 (6)	2.737 (10)	174 (6)
N2—H2N⋯O4B	0.82 (6)	1.96 (6)	2.683 (9)	146 (6)
O4A—H1O4⋯O2	0.85	2.00	2.787 (10)	155
C28—H28⋯O3i	0.93	2.48	3.347 (8)	155

Symmetry code: (i) .