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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2W—H2WA⋯O1	0.82 (2)	2.14 (2)	2.882 (5)	151 (5)
O1W—H1WA⋯O2W	0.85 (2)	1.87 (7)	2.623 (8)	147 (11)
N8—H8A⋯O1W i	0.91	2.19	3.091 (7)	169

Symmetry code: (i) .