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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯N2i	0.92	2.24	3.140 (7)	167
N5—H5A⋯N2ii	0.92	2.17	3.083 (6)	169
N5—H5B⋯N3	0.92	2.30	3.180 (8)	159
N6—H6A⋯N2i	0.92	2.23	3.073 (7)	152
N6—H6B⋯N3	0.92	2.54	3.349 (7)	147
N7—H7A⋯N1iii	0.92	2.42	3.295 (8)	158
N7—H7B⋯N1iv	0.92	2.36	3.159 (7)	145
N8—H8A⋯N1iii	0.92	2.07	2.985 (8)	179
N9—H9A⋯N2ii	0.92	2.42	3.212 (8)	144

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