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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.82 (2)	2.40 (2)	3.089 (3)	142 (3)
N1—H1N⋯O3	0.82 (2)	2.52 (3)	2.893 (4)	109 (2)
N3—H3N⋯O7	0.83 (2)	2.42 (3)	2.963 (3)	124 (3)
N3—H3N⋯O6ii	0.83 (2)	2.54 (2)	3.195 (3)	136 (3)

Symmetry codes: (i) ; (ii) .