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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O12	0.88	1.82	2.671 (8)	162
N3—H3A⋯O11i	0.88	2.06	2.760 (8)	136
N3—H3B⋯N1	0.88	2.05	2.713 (9)	131
N4—H4A⋯O12ii	0.88	2.03	2.861 (7)	158
N4—H4B⋯O11	0.88	1.91	2.790 (8)	173

Symmetry codes: (i) ; (ii) .