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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N8A—H8A⋯N2B	0.94	2.05	2.980 (5)	171
N8B—H8B⋯N2A	0.98	2.04	3.015 (5)	173