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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2B⋯O2i	0.86	2.00	2.839 (3)	166
N4—H4B⋯O6ii	0.86	2.12	2.950 (3)	161
N6—H61⋯O4ii	0.88 (2)	2.10 (2)	2.955 (3)	166 (2)

Symmetry codes: (i) ; (ii) .