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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N7—H7⋯Cl1	0.89 (2)	2.25 (2)	3.1358 (14)	176.7 (19)
N8—H8⋯Cl1i	0.849 (14)	2.905 (14)	3.1970 (14)	102.4 (11)
N1—H1⋯N8ii	0.89 (2)	1.92 (2)	2.8069 (19)	172.0 (19)

Symmetry codes: (i) ; (ii) .