Table 3. Hydrogen-bond geometry (Å, °) for 3a .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N6—H061⋯O1i	0.84 (2)	2.24 (3)	2.9899 (17)	149 (2)
N6—H062⋯N4i	0.84 (2)	2.33 (2)	3.054 (2)	144 (2)
C8—H8A⋯O1ii	0.98	2.52	3.279 (2)	134
N6—H062⋯N2	0.84 (2)	2.25 (2)	2.6273 (19)	108 (2)

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