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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H3O⋯O4	0.88 (2)	1.76 (2)	2.572 (2)	153 (2)
N2—H2N⋯O2i	0.87 (2)	2.21 (2)	3.052 (2)	161 (2)
N2—H2N⋯N1	0.87 (2)	2.34 (2)	2.753 (2)	109 (2)
C9—H9B⋯O2	0.98	2.49	2.864 (2)	102

Symmetry code: (i) .