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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2⋯N6i	0.82	1.97	2.760 (4)	163
O1—H1B⋯N5ii	0.85	1.94	2.785 (3)	176
O1—H1A⋯O2iii	0.85	1.81	2.660 (3)	173

Symmetry codes: (i) ; (ii) ; (iii) .