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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2B⋯O7	0.86	1.99	2.830 (3)	167
O7—H1⋯O6ii	0.84 (1)	2.05 (2)	2.862 (2)	163 (3)
O7—H2⋯N3iii	0.83 (1)	2.18 (1)	3.004 (3)	167 (3)

Symmetry codes: (ii) ; (iii) .