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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N8—H8⋯N15i	0.89 (3)	1.96 (3)	2.830 (3)	167 (2)
C4—H4⋯N2ii	0.93	2.57	3.447 (3)	157

Symmetry codes: (i) x-{\script{1\over 2}}, y, -z+{\script{3\over 2}}; (ii) -x+{\script{3\over 2}}, y+{\script{1\over 2}}, z.