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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O6i	0.88 (3)	2.17 (3)	2.967 (5)	150 (4)
N4—H4C⋯O2ii	0.85 (5)	2.44 (5)	3.245 (5)	159 (5)
N6—H6⋯O14iii	0.96 (5)	2.30 (5)	3.196 (5)	154 (4)
N8—H8⋯O10iv	0.92 (3)	2.08 (4)	2.936 (5)	155 (7)

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