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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N8—H8A⋯O1i	0.86	2.03	2.885 (3)	177
N6—H6A⋯O4ii	0.86	2.02	2.854 (3)	164
N2—H2A⋯O1iii	0.86	1.96	2.790 (3)	162
N4—H4B⋯O4iv	0.86	1.93	2.764 (3)	162

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) .