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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N6i	0.82	2.03	2.842 (4)	174
O1—H1B⋯N4ii	0.85	2.07	2.868 (4)	157

Symmetry codes: (i) ; (ii) .