Table 1. Hydrogen-bond geometry (Å).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C8—H8B⋯Cg i	0.97	2.78	3.742 (6)	172

Symmetry code: (i) . Cg is the centroid of the N1,C1–C5 ring.