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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N6—H6B⋯O2i	0.92 (3)	1.90 (3)	2.744 (2)	152 (2)
N6—H6A⋯O2ii	0.91 (3)	2.01 (3)	2.899 (2)	164 (2)

Symmetry codes: (i) ; (ii) .