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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2⋯O4	0.86	1.82	2.678 (7)	172.1
N4—H4⋯O2	0.86	1.87	2.717 (7)	168.3
N6—H6A⋯O3i	0.86	1.96	2.725 (8)	148.3
N8—H8⋯O3i	0.86	1.89	2.669 (8)	149.3
N10—H10⋯O2ii	0.86	2.23	2.887 (7)	133.7
N10—H10⋯O4iii	0.86	2.39	3.034 (9)	132.5
N12—H12A⋯O4iii	0.86	1.93	2.685 (8)	146.0

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