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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯O1i	0.88	2.44	3.266 (3)	157
N4—H4B⋯O2ii	0.88	2.30	3.108 (4)	152
N8—H8A⋯O3iii	0.88	2.54	3.084 (3)	120
N8—H8B⋯O5iv	0.88	2.26	3.114 (4)	162
O5—H5⋯O4v	0.89 (4)	1.91 (4)	2.785 (3)	169 (4)

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