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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H21⋯O7i	0.84 (2)	2.03 (2)	2.8518 (19)	163.7 (17)
N2—H22⋯O3ii	0.879 (19)	2.109 (18)	2.9662 (17)	165.1 (18)
O5—H51⋯O1iii	0.78 (3)	1.87 (2)	2.6485 (16)	177 (3)
O5—H52⋯O2	0.897 (19)	1.847 (19)	2.7349 (16)	169.6 (18)
O6—H61⋯O1iv	0.87 (3)	1.91 (3)	2.7792 (17)	175 (2)
O6—H62⋯O2v	0.84 (3)	1.94 (3)	2.7710 (17)	171 (3)
O7—H71⋯O3iii	0.81 (3)	2.11 (3)	2.9260 (19)	176 (2)
O7—H72⋯O4	0.84 (2)	1.90 (2)	2.7333 (18)	174 (2)
C9—H9⋯O7i	0.93	2.59	3.480 (2)	160
C12—H12⋯O5vi	0.93	2.44	3.193 (2)	138

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) .